Can HIV be syphilis checked by the CDC?
Publish: 2021-05-21 23:08:28
1.
1. It is not an innovation to set up a stall, but it has been paid so much attention to in the process of revitalizing the economy. The basic reason is that it can meet the people's demand for "cheap" and "convenient"
2. The purpose of stall economy is to excavate new consumption increment on the basis of the existing target customer base, which can be cut in from the angle of horizontal and vertical parallel, that is, to develop new potential consumer groups horizontally and expand in depth in the original consumption stock vertically
The development of stall economy is actually a better foothold of virtual economy, and the return of stall economy will better let consumers experience the quality of goods The stall economy, to a certain extent, stimulates consumption and gives many unemployed people the opportunity to choose a job{rrrrrrr}
extended information: advantages and disadvantages of stall economy advantages: low threshold, no shop rent pressure, no too high ecation and skills requirements, many people can sell goods by setting up a stall and opening the private car trunk; The risk of failure is low, the ship is small, and it is easy to turn around, so the practitioners can quickly "resurrect with full blood" even if they lose; Low commodity prices can give residents more choices and benefits disadvantages: it brings certain impact on traffic and environment; Damage the interests of regular shops; There are some social contradictions, such as the competition between vendors for selling sites, the growing contradictions between vendors and urban management, and the hostility and helplessness of surrounding shops to vendors
2. 1. Since it is for the CDC to test, then the test results may indeed have problems. The most common is that the initial screening result is positive. We need to go to the CDC for confirmation test to confirm the reliability of the test results, because the initial screening may have false positive. 2. It's inappropriate for you to use the word hope. You can't hope that. I can only say it's very possible.
3. Some are like boats, some are like fans, and some are like small palms... Looking at the scene in front of me, I can't help but think of a poem: "fallen leaves are not merciless things, they are more protective than spring mud." Is there no emotion? After it turns into soil, it will always guard the flowers and plants. Thinking of this, I have a feeling of admiration for the fallen leaves in my heart.
4. It should be able to check< At present, syphilis is one of the items of routine examination before operation, which can also be done in general hospitals.
5. First of all, we should not be afraid of AIDS, and then consider the examination, otherwise we can never rest assured that if the result is negative in 4 weeks, the infection rate can be ruled out to be about 98%; After 6 weeks, the result was negative and the infection rate was 99.99%; Saliva collector can be free test, only about one in ten thousand people window period in 6 weeks to 3 months, in order to 100% rule out the possibility of infection, the best full 3 months to do the final test. Aiwei JD wish you health!
6. It only depends on the availability of the service. Only a small number of CDCs are tested for syphilis.
7. The content of gold in the ore is very low. In order to extract gold, it is necessary to crush and grind the ore and preconcentrate or separate gold from the ore by mineral processing. Gravity separation and flotation are widely used in gold beneficiation. Gravity separation plays a very important role in placer gold proction. Flotation is widely used in rock gold mines. At present, about 80% of rock gold mines in China adopt this method for gold beneficiation. The level of beneficiation technology and equipment has been greatly improved< According to the investigation, jaw crushers are mostly used in China's gold concentrators for coarse crushing, standard cone crushers for medium crushing, and short head cone crushers and counter roller crushers for fine crushing. Medium and small gold concentrators mostly adopt two-stage one closed circuit crushing process, while large gold concentrators adopt three-stage one closed circuit crushing process
in order to improve the proction capacity of mineral processing and tap the potential of equipment, the crushing process has been reformed to improve the utilization coefficient of the grinding machine. The main measures adopted are more crushing and less grinding to rece the particle size of the incoming grinding stone< (2) gravity separation
gravity separation is widely used in rock gold mines. It is mostly used as an auxiliary process to recover coarse gold in grinding circuit, which creates favorable conditions for flotation and cyanidation process, improves beneficiation indexes, increases the total recovery of gold, and plays a positive role in increasing output and recing cost. More than 10 gold concentrators in Shandong Province have adopted the gravity separation process. The average total recovery rate can be increased by 2% ~ 3%. The economic benefit of the enterprise is good. According to incomplete statistics, the annual profit can be several million yuan. Henan, Hunan, Inner Mongolia and other provinces (regions) have also achieved good results, the main equipment used are chute, shaker, jig and short cone cyclone. From the view of most gold mines in China, the flotation gravity combined process (gravity separation for flotation tailings) is suitable for use. In the future, it is necessary to vigorously promote the stage grinding stage separation process and advocate the principle of early recovery< (3) flotation
according to the survey, about 80% of China's rock gold mines adopt flotation method for gold separation, and the concentrate proced is mostly sent to non-ferrous smelters for treatment. Due to the increasing development of cyanidation and in order to improve the economic benefit and rece the loss of concentrate transportation, the proct structure has changed greatly in recent years. Most of them adopt on-site treatment (of course, because of the contradiction between beneficiation and metallurgy and pricing problems, the mine is forced to treat on-site), which promotes the great development of flotation technology and occupies an important position in gold proction. There are usually two kinds of flotation processes: preferential flotation and mixed flotation. In recent years, new progress has been made in technological process improvement and reagent addition system, and flotation recovery has been improved significantly. According to the investigation results of flotation process indexes of more than 40 gold concentrators in China, the flotation recovery rate of sulfide ore is 90%, and a few of them are as high as 95% ~ 97%; The recovery of oxide ore is about 75%; Some of them are 80% - 85%. In recent years, there are a lot of innovation and scientific research achievements in flotation process, and the effect is obvious. Stage grinding flotation process and gravity flotation combined process are the main trend of flotation technology development in China. For example, Xiangxi Gold Mine adopts gravity flotation combined process to grind ore in stages and separate ore in stages, which can obtain better indexes and increase recovery by more than 6%; Jiaojia gold mine, Wulong gold mine, Wenyu Gold Mine and Dongchuang gold mine have also achieved certain results. Another example is Xincheng Gold Mine, where the original flowsheet is direct flotation of raw ore. e to the high mud content of the ore itself and the insufficient cemented filling strength of mining tailings, some mud and sand are brought in, the beneficiation indexes continuously decrease. Through investigation and test, the process flow of mud sand separation is adopted, the recovery rate is increased from 93.05% to 95.01%, the concentrate grade is increased from 135g / T to 140g / T, and the proction is stable. Because the grade of raw ore in Jinchangyu Gold Mine is decreasing year by year, the flotation index is reced. Through the cooperation with Shenyang Gold Institute and other units, the branch flotation process is adopted, and the flotation index and concentrate grade are improved. This scientific research achievement (passed the technical appraisal in January 1988) provides new enlightenment for the reform of flotation process. Of course, like other methods, flotation method is not omnipotent, and it is impossible to be effective for all gold bearing ores. The ore properties should be mainly considered. When selecting the technological process, it is necessary to carry out various demonstrations and tests
in recent years, in order to improve the separation effect, many improvements and researches have been made on the reagent addition system and mixed medication, and new progress has been made in the automatic control of dosing< (4) chemical separation hydrometallurgical gold extraction process
1. Mixed mercury gold extraction process
is an ancient gold extraction process, which is simple, economical and suitable for the recovery of coarse monomer gold. This method is still used in many gold mines in China. With the development of gold proction and the progress of science and technology, the process of extracting gold by mixed mercury method has been improved and perfected. Due to the increasingly stringent requirements of environmental protection, some mines have cancelled the mercury mixing operation and replaced it by gravity separation, flotation and cyanidation
in the proction of gold, the process of extracting gold by mixed mercury method still plays an important role, and has been applied at home and abroad. At present, this technology has been applied in many gold mines, such as Zhangjiakou, Hebei, Ergou, Liaoning, Jiapigou, Jilin and Yinan, Shandong. Liaoning Ergou gold mine was originally a single flotation process. According to the ore properties, it was changed into a combined process of mixed mercury and flotation. The total recovery was increased by 7.81% (the recovery of mixed mercury was 64.6%), the tailings grade was reced from 0.74g/t to 0.32g/t, and the annual benefit was 1.58 million yuan. The key to the process of gold extraction by mixed mercury method is how to take protective measures to eliminate mercury pollution< Cyanidation is the main method of extracting gold from ore or concentrate. The process of gold extraction by cyanidation includes: cyanidation leaching, washing and filtration of leaching pulp, extraction of gold from cyanidation solution or cyanidation pulp and smelting of finished procts. There are two kinds of gold extraction processes in the existing cyanidation plants of gold mines in China. One is the so-called conventional cyanidation process (CCD method and CCF method) in which the thickener is used for continuous countercurrent washing and zinc powder is used to replace the precipitation to recover gold. The other is that there is no need for filtration and washing, CIP process and CIL process were used to recover gold from cyanide pulp directly by activated carbon adsorption< The conventional cyanidation process can be divided into two types according to the different materials: one is the cyanidation plant which processes flotation gold concentrate or mixed mercury and gravity tailings. Most of them are large state-owned mines. For example, Jinchangyu in Hebei Province; Wulong, Liaoning, Yangzhaiyu, Henan; Zhaoyuan, Xincheng, Jiaojia and Sanshan gold mines in Shandong Province. The other is a gold extraction plant which processes argillaceous oxide ore and uses whole slime stirring cyanidation. Such as Jilin trench; Tuanjiegou, Heilongjiang Province; Xinqiao gold and silver mine in Anhui Province
the cyanidation process has been used in China since 1930s. During 1936-1938, Jinguashi gold mine in Taiwan used cyanidation zinc powder replacement process to extract gold with an annual output of 150000 taels< After entering the 1960s, in order to adapt to the development of national economy and vigorously develop the proction of mineral gold, the intermittent mechanical agitation cyanidation process and continuous agitation cyanidation process were successively adopted in some mines to replace the percolation cyanidation process. In 1967, the continuous mechanical agitation cyanidation process was first realized in Lingshan and Linglong gold concentrators of Zhaoyuan gold mine, Shandong Province. The cyanidation rate increased from 70% to 93.23%. Since then, the continuous mechanical agitation cyanidation process has been rapidly promoted in major gold mines in China. The cyanidation plants of Changyu gold mine in 1970 and Wulong gold mine in 1977 were successively built and put into operation. Since then, a number of mechanical stirring cyanidation plants have been built and put into operation in China. The cyanidation process has entered a new stage of development
with the continuous development of gold proction and the rapid development of gold resources, a large number of argillaceous high gold bearing oxide ores have been increased since the 1980s. The research on the whole slime cyanidation agitation leaching of this kind of ores has been carried out, and a cyanidation plant with a daily treatment capacity of 500 tons has been built in Tuanjiegou gold mine, Heilongjiang Province, which was put into proction in 1983. Since then, the whole slime cyanidation process has been widely used in Henan, Jilin, Hebei, Shaanxi, Inner Mongolia and other places. At the same time, in order to solve the difficulty of solid-liquid separation in dense filtration of argillaceous oxidized ore, Changchun Gold Research Institute began to use the non filtration carbon slurry process to extract gold from the ore of Tuanjiegou gold mine in November 1979. The experimental research lasted for two years and was successful. On this basis, in August 1984, China's first gold extraction plant with 50 tons of ore per day was designed and built in Linghu gold mine, Henan Province. It is a great step forward in the cyanidation process of gold extraction in China. The technology of extracting gold by carbon slurry has become one of the most important methods to treat argillaceous oxidized ore in rock gold mines. Since then, gold extraction plants have been established in Jilin, Henan, Inner Mongolia, Shaanxi and other places. At the end of 1984, the gold Bureau of the Ministry of metallurgical instry, in order to promote the application of carbon slurry process in China, transplanted and digested foreign advanced technology and equipment, cooperated with David McKee company of the United States, and established a 250t / D (xitongyu) and 450t / D (Zhangjiakou) carbon leaching gold extraction plant in xitongyu gold mine of Shaanxi Province and Zhangjiakou gold mine of Hebei Province, respectively. According to the investigation, the recovery rate of Zhangjiakou gold mine is 93.54% (the recovery rate of carbon slurry was 90.25% in 1988)
according to the scientific and technological innovation, the level of gold proction technology in China has been greatly improved. For example, Jinchangyu Gold Mine successfully used zinc powder instead of zinc wire to replace gold mud, the replacement rate reached 99.89%, the gold grade of gold mud was significantly improved, the zinc consumption was reced from 2.2kg/t to 0.6kg/t, and the proction cost was greatly reced. Then, the application in Zhaoyuan, Jiaojia, Xincheng, Wulong and other mines also achieved obvious results. The heap leaching process of low-grade oxidized ore has been applied in Henan, Hebei, Liaoning, Yunnan, Hubei, Inner Mongolia, Heilongjiang, Jilin, Shaanxi and other provinces after the successful test in Dandong Hushan gold mine. The economic effect is obvious, which opens a way for the development and utilization of low-grade oxidized ore. According to incomplete statistics, the annual output of gold proced by heap leaching in China is more than 10000 taels (only 13000 taels of gold proced by heap leaching in Henan Province), but compared with developed countries, the scale of heap leaching in China is smaller, generally 1 × 103~3 × 103t / heap, 10000 t / heap is less, and there is a big gap in technology. In 1988, Shuangwang gold mine in Tai County, Shaanxi province put into operation, and achieved gratifying results (ore grade 1.5g/t)
the introction and digestion of foreign advanced technology and equipment (such as high-efficiency thickener in the United States, double screw stirring leaching tank, Mars pump in Japan, belt filter, etc.) has further improved the equipment level and technical level of China's gold proction, and promoted the development of China's gold processing equipment in the direction of high efficiency, energy saving, large-scale and automation. In recent years, new progress has been made in the research of new technologies such as thiourea extraction, thiosulfate extraction, preoxidation bacterial leaching, pressure catalytic leaching and resin adsorption. In 1979, Changchun Gold Research Institute successfully carried out the experiment of extracting gold with thiourea, and in 1984, a daily processing gold flotation plant was built in Guangxi Longshui mine
in order to improve the proction capacity of mineral processing and tap the potential of equipment, the crushing process has been reformed to improve the utilization coefficient of the grinding machine. The main measures adopted are more crushing and less grinding to rece the particle size of the incoming grinding stone< (2) gravity separation
gravity separation is widely used in rock gold mines. It is mostly used as an auxiliary process to recover coarse gold in grinding circuit, which creates favorable conditions for flotation and cyanidation process, improves beneficiation indexes, increases the total recovery of gold, and plays a positive role in increasing output and recing cost. More than 10 gold concentrators in Shandong Province have adopted the gravity separation process. The average total recovery rate can be increased by 2% ~ 3%. The economic benefit of the enterprise is good. According to incomplete statistics, the annual profit can be several million yuan. Henan, Hunan, Inner Mongolia and other provinces (regions) have also achieved good results, the main equipment used are chute, shaker, jig and short cone cyclone. From the view of most gold mines in China, the flotation gravity combined process (gravity separation for flotation tailings) is suitable for use. In the future, it is necessary to vigorously promote the stage grinding stage separation process and advocate the principle of early recovery< (3) flotation
according to the survey, about 80% of China's rock gold mines adopt flotation method for gold separation, and the concentrate proced is mostly sent to non-ferrous smelters for treatment. Due to the increasing development of cyanidation and in order to improve the economic benefit and rece the loss of concentrate transportation, the proct structure has changed greatly in recent years. Most of them adopt on-site treatment (of course, because of the contradiction between beneficiation and metallurgy and pricing problems, the mine is forced to treat on-site), which promotes the great development of flotation technology and occupies an important position in gold proction. There are usually two kinds of flotation processes: preferential flotation and mixed flotation. In recent years, new progress has been made in technological process improvement and reagent addition system, and flotation recovery has been improved significantly. According to the investigation results of flotation process indexes of more than 40 gold concentrators in China, the flotation recovery rate of sulfide ore is 90%, and a few of them are as high as 95% ~ 97%; The recovery of oxide ore is about 75%; Some of them are 80% - 85%. In recent years, there are a lot of innovation and scientific research achievements in flotation process, and the effect is obvious. Stage grinding flotation process and gravity flotation combined process are the main trend of flotation technology development in China. For example, Xiangxi Gold Mine adopts gravity flotation combined process to grind ore in stages and separate ore in stages, which can obtain better indexes and increase recovery by more than 6%; Jiaojia gold mine, Wulong gold mine, Wenyu Gold Mine and Dongchuang gold mine have also achieved certain results. Another example is Xincheng Gold Mine, where the original flowsheet is direct flotation of raw ore. e to the high mud content of the ore itself and the insufficient cemented filling strength of mining tailings, some mud and sand are brought in, the beneficiation indexes continuously decrease. Through investigation and test, the process flow of mud sand separation is adopted, the recovery rate is increased from 93.05% to 95.01%, the concentrate grade is increased from 135g / T to 140g / T, and the proction is stable. Because the grade of raw ore in Jinchangyu Gold Mine is decreasing year by year, the flotation index is reced. Through the cooperation with Shenyang Gold Institute and other units, the branch flotation process is adopted, and the flotation index and concentrate grade are improved. This scientific research achievement (passed the technical appraisal in January 1988) provides new enlightenment for the reform of flotation process. Of course, like other methods, flotation method is not omnipotent, and it is impossible to be effective for all gold bearing ores. The ore properties should be mainly considered. When selecting the technological process, it is necessary to carry out various demonstrations and tests
in recent years, in order to improve the separation effect, many improvements and researches have been made on the reagent addition system and mixed medication, and new progress has been made in the automatic control of dosing< (4) chemical separation hydrometallurgical gold extraction process
1. Mixed mercury gold extraction process
is an ancient gold extraction process, which is simple, economical and suitable for the recovery of coarse monomer gold. This method is still used in many gold mines in China. With the development of gold proction and the progress of science and technology, the process of extracting gold by mixed mercury method has been improved and perfected. Due to the increasingly stringent requirements of environmental protection, some mines have cancelled the mercury mixing operation and replaced it by gravity separation, flotation and cyanidation
in the proction of gold, the process of extracting gold by mixed mercury method still plays an important role, and has been applied at home and abroad. At present, this technology has been applied in many gold mines, such as Zhangjiakou, Hebei, Ergou, Liaoning, Jiapigou, Jilin and Yinan, Shandong. Liaoning Ergou gold mine was originally a single flotation process. According to the ore properties, it was changed into a combined process of mixed mercury and flotation. The total recovery was increased by 7.81% (the recovery of mixed mercury was 64.6%), the tailings grade was reced from 0.74g/t to 0.32g/t, and the annual benefit was 1.58 million yuan. The key to the process of gold extraction by mixed mercury method is how to take protective measures to eliminate mercury pollution< Cyanidation is the main method of extracting gold from ore or concentrate. The process of gold extraction by cyanidation includes: cyanidation leaching, washing and filtration of leaching pulp, extraction of gold from cyanidation solution or cyanidation pulp and smelting of finished procts. There are two kinds of gold extraction processes in the existing cyanidation plants of gold mines in China. One is the so-called conventional cyanidation process (CCD method and CCF method) in which the thickener is used for continuous countercurrent washing and zinc powder is used to replace the precipitation to recover gold. The other is that there is no need for filtration and washing, CIP process and CIL process were used to recover gold from cyanide pulp directly by activated carbon adsorption< The conventional cyanidation process can be divided into two types according to the different materials: one is the cyanidation plant which processes flotation gold concentrate or mixed mercury and gravity tailings. Most of them are large state-owned mines. For example, Jinchangyu in Hebei Province; Wulong, Liaoning, Yangzhaiyu, Henan; Zhaoyuan, Xincheng, Jiaojia and Sanshan gold mines in Shandong Province. The other is a gold extraction plant which processes argillaceous oxide ore and uses whole slime stirring cyanidation. Such as Jilin trench; Tuanjiegou, Heilongjiang Province; Xinqiao gold and silver mine in Anhui Province
the cyanidation process has been used in China since 1930s. During 1936-1938, Jinguashi gold mine in Taiwan used cyanidation zinc powder replacement process to extract gold with an annual output of 150000 taels< After entering the 1960s, in order to adapt to the development of national economy and vigorously develop the proction of mineral gold, the intermittent mechanical agitation cyanidation process and continuous agitation cyanidation process were successively adopted in some mines to replace the percolation cyanidation process. In 1967, the continuous mechanical agitation cyanidation process was first realized in Lingshan and Linglong gold concentrators of Zhaoyuan gold mine, Shandong Province. The cyanidation rate increased from 70% to 93.23%. Since then, the continuous mechanical agitation cyanidation process has been rapidly promoted in major gold mines in China. The cyanidation plants of Changyu gold mine in 1970 and Wulong gold mine in 1977 were successively built and put into operation. Since then, a number of mechanical stirring cyanidation plants have been built and put into operation in China. The cyanidation process has entered a new stage of development
with the continuous development of gold proction and the rapid development of gold resources, a large number of argillaceous high gold bearing oxide ores have been increased since the 1980s. The research on the whole slime cyanidation agitation leaching of this kind of ores has been carried out, and a cyanidation plant with a daily treatment capacity of 500 tons has been built in Tuanjiegou gold mine, Heilongjiang Province, which was put into proction in 1983. Since then, the whole slime cyanidation process has been widely used in Henan, Jilin, Hebei, Shaanxi, Inner Mongolia and other places. At the same time, in order to solve the difficulty of solid-liquid separation in dense filtration of argillaceous oxidized ore, Changchun Gold Research Institute began to use the non filtration carbon slurry process to extract gold from the ore of Tuanjiegou gold mine in November 1979. The experimental research lasted for two years and was successful. On this basis, in August 1984, China's first gold extraction plant with 50 tons of ore per day was designed and built in Linghu gold mine, Henan Province. It is a great step forward in the cyanidation process of gold extraction in China. The technology of extracting gold by carbon slurry has become one of the most important methods to treat argillaceous oxidized ore in rock gold mines. Since then, gold extraction plants have been established in Jilin, Henan, Inner Mongolia, Shaanxi and other places. At the end of 1984, the gold Bureau of the Ministry of metallurgical instry, in order to promote the application of carbon slurry process in China, transplanted and digested foreign advanced technology and equipment, cooperated with David McKee company of the United States, and established a 250t / D (xitongyu) and 450t / D (Zhangjiakou) carbon leaching gold extraction plant in xitongyu gold mine of Shaanxi Province and Zhangjiakou gold mine of Hebei Province, respectively. According to the investigation, the recovery rate of Zhangjiakou gold mine is 93.54% (the recovery rate of carbon slurry was 90.25% in 1988)
according to the scientific and technological innovation, the level of gold proction technology in China has been greatly improved. For example, Jinchangyu Gold Mine successfully used zinc powder instead of zinc wire to replace gold mud, the replacement rate reached 99.89%, the gold grade of gold mud was significantly improved, the zinc consumption was reced from 2.2kg/t to 0.6kg/t, and the proction cost was greatly reced. Then, the application in Zhaoyuan, Jiaojia, Xincheng, Wulong and other mines also achieved obvious results. The heap leaching process of low-grade oxidized ore has been applied in Henan, Hebei, Liaoning, Yunnan, Hubei, Inner Mongolia, Heilongjiang, Jilin, Shaanxi and other provinces after the successful test in Dandong Hushan gold mine. The economic effect is obvious, which opens a way for the development and utilization of low-grade oxidized ore. According to incomplete statistics, the annual output of gold proced by heap leaching in China is more than 10000 taels (only 13000 taels of gold proced by heap leaching in Henan Province), but compared with developed countries, the scale of heap leaching in China is smaller, generally 1 × 103~3 × 103t / heap, 10000 t / heap is less, and there is a big gap in technology. In 1988, Shuangwang gold mine in Tai County, Shaanxi province put into operation, and achieved gratifying results (ore grade 1.5g/t)
the introction and digestion of foreign advanced technology and equipment (such as high-efficiency thickener in the United States, double screw stirring leaching tank, Mars pump in Japan, belt filter, etc.) has further improved the equipment level and technical level of China's gold proction, and promoted the development of China's gold processing equipment in the direction of high efficiency, energy saving, large-scale and automation. In recent years, new progress has been made in the research of new technologies such as thiourea extraction, thiosulfate extraction, preoxidation bacterial leaching, pressure catalytic leaching and resin adsorption. In 1979, Changchun Gold Research Institute successfully carried out the experiment of extracting gold with thiourea, and in 1984, a daily processing gold flotation plant was built in Guangxi Longshui mine
8. Yes, the CDC is the management of AIDS, is free, to the hospital check will receive money, usually blood test, check the antibody, the time to know the results will also be determined by the efficiency of the staff, but this is only a simple test, very soon. I wish you good health.
9. Go to the hospital to do a syphilis diagnosis test can know, syphilis can be cured
Hot content