What is the area of rare earth ore leaching pool
The main technological process of rare earth extraction is as follows: topsoil stripping → excavation of ore bearing body, ore transportation → leaching pool → using electrolyte solution prepared according to a certain proportion (concentration requirement) as & quot; Eluent & quot; Or & quot; Leaching agent;, The solution is added to the leaching tank, and the concentration of & quot; Ionic phase & quot; Rare earth ore is analyzed by & quot; Percolation elution & quot; Or & quot; Leaching & quot; In the solution, the active ions exchange with rare earth ions; Ionic phase & quot; Rare earth is exchanged from the ore bearing carrier minerals and becomes a new state of rare earth
Add & quot; Top water;, The mother liquor containing rare earth was obtained; The mother liquor flows into the collecting tank or mother liquor tank through the pipeline or infusion ditch, and then enters the sedimentation tank; After leaching, the waste resie is removed from the leaching tank and discharged in other places → precipitant and impurity remover are added to the sedimentation tank to remove and precipitate the rare earth in the mother liquor and obtain mixed rare earth
After treatment, the supernatant was returned to the leaching tank for & quot; Eluent & quot; The purity of mixed rare earth oxide is more than 92% 
extended data:
the distribution of rare earth minerals is mainly silicate and oxide in magmatic rocks and pegmatites, and fluorocarbonate and phosphate in hydrothermal deposits and weathering crust deposits. Most of the yttrium rich minerals are hosted in granitoids and related pegmatites, aerogenic hydrothermal deposits and hydrothermal deposits
Rare earth elements often coexist in the same mineral because of their similar atomic structure, chemical and crystal chemical properties, that is, cerium group rare earth elements and yttrium group rare earth elements often coexist in the same mineral, but these elements do not coexist in the same amount, some minerals are dominated by cerium group rare earth elements, and some minerals are dominated by yttrium group rare earth elementsmix 60% of rare earth concentrate with concentrated alkali solution, and melt at high temperature. The rare earth concentrate will be decomposed, and the rare earth will be changed into rare earth hydroxide. The alkali cake will be washed with water to remove sodium salt and excess alkali, and then the washed rare earth hydroxide will be dissolved with hydrochloric acid, and the rare earth will be dissolved into rare earth chloride solution, and the acidity will be adjusted to remove impurities, The filtered rare earth chloride solution is concentrated and crystallized to obtain solid rare earth chloride
In the 1980s, one ton of rare earth ore could be exchanged for two Japanese crown cars. However, in the 1980s and 1990s, Ganzhou's rare earth instry fell into a chaotic situation of indiscriminate mining and disorderly competition. At the end of the 1990s, most of the mines in Ganzhou stopped proction or closed down e to the weak market, and the liabilities of the whole rare earth instry exceeded 300 million yuan“ In the past 10 years, Ganzhou City has made up its mind to control the mining, embark on the road of resource integration and instrial development, and become a relatively standardized area for the integration of rare earth resources in China< In terms of rare earth mining, Ganzhou issued annual mandatory plans, issued proction plan quota cards, reced proction sites and other measures to control proction scale, and severely cracked down on unlicensed mining and indiscriminate mining. Since 2003, more than 3000 illegal rare earth mining sites have been banned and closed, more than 2600 leaching pools have been destroyed, and more than 90 cases of illegal transportation and marketing have been investigated and dealt with
including export quota restrictions, China has repeatedly taken measures to protect and rectify rare earth in recent years. Li Shanle, director of the nonferrous metals department of Jiangxi Provincial Commission of instry and information technology, believes that the establishment of the national rare earth planning area is a new measure for China to comprehensively consider the protection of rare earth resources and the rational development of instry. After the establishment of the planning area, the state will carry out long-term management of rare earth from multiple perspectives
rare earth is the abbreviation of rare earth group elements, and 17 elements are often classified into the rare earth family. China is the country with the richest rare earth resources, and its reserves and output rank first in the world. Ionic rare earth is a new type of rare earth mineral resources in China. It is characterized by complete distribution, high content of high value-added elements, low specific radioactivity, many high-tech application elements and high comprehensive utilization value; Five & quot; In a sense, it has changed, promoted and accelerated the process of world high technology. The second generation extraction technology of ionic rare earth -- & quot; In situ leaching process;, Won the & quot; The Eighth Five Year Plan & quot; The national science and technology major achievement award is the national & quot; The Eighth Five Year Plan & quot; Science and technology attacking the pass & quot; Top ten world leading technological achievements & quot; He won the National Invention Award in 1997. This research achievement was reported by CCTV in the news program in 1996. It is a unique ionic rare earth in China. Since the discovery, naming and the invention of the second generation extraction process in 1970, after 25 years of confidentiality management, it has been officially disclosed at home and abroad for the first time; Show up & quot
the technology of ionic rare earth is the independent intellectual property of China. Ganzhou Research Institute of nonferrous metallurgy is the main unit of scientific and technological achievements in the discovery and naming of ion adsorption rare earth ore and the second generation of rare earth extraction technology in China. Comrade Ding Jiayu, who was then deputy director in charge of scientific research and later director of Ganzhou Institute of nonferrous metallurgy, as the main participant and leader in the invention and application of the second generation extraction process of ionic rare earth ore, has an unforgettable memory of the historical development process of this event. At the request of the reporter, Comrade Ding Jiayu reviewed and summarized this historical event comprehensively and systematically
up to 1970, in the past 175 years of development and utilization history of rare earth mineral resources, it was found that there are as many as 200 kinds of minerals containing rare earth elements and their compounds in nature. However, there are only a few rare earth minerals with real instrial value, about 10 kinds. There are mainly monazite, ceric silica, bastnaesite, beryllium yttrium silicate, phosphorite, epidote, niobium yttrium ore and black rare gold ore. However, most of these minerals contain a certain amount of uranium or thorium, and the rare earth minerals exist as solid and mineral phase minerals, which are often associated with radioactive elements
in the late 20th century, with the rapid development of high technology and instrialization in the world, especially since the 1980s, the use of medium and heavy rare earth elements in the world has increased sharply, especially the demand for neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, yttrium and other rare earth elements. In view of the following reasons: first, in the traditional rare earth mineral resources, the content of most of the above rare earth elements is limited, so it is difficult to obtain rare earth concentrate; Second, because of the complexity of the proction process, the process is very long, the cost is high, and the price is expensive. If it has to be instrialized, it is very difficult, and the output is difficult to meet the requirements; Third, according to the characteristics of traditional rare earth deposit resources, if we want to obtain the above-mentioned target elements in a certain mine at the same time, it is difficult to achieve the effect. It is necessary to mine multiple rare earth mines with different distribution to meet the above-mentioned needs at the same time. Obviously, only relying on the development of traditional rare earth resources is bound to be difficult to meet the rapid development trend of modern high technology and the demand for rare earth elements. Therefore, this situation will inevitably lead to the pursuit and exploration of new rare earth resources, hoping to obtain the reliable guarantee of rare earth resources needed by high technology< In fact, as early as the 1960s, China recognized the important role of medium and heavy rare earth resources, especially heavy rare earth resources, in national defense construction and national economic construction from a strategic perspective. In the mid-1960s, the former Ministry of metallurgical instry organized the South heavy rare earth resources research conference according to the national military plan. Aiming at the surrounding rock of a mine in South China, through scientific and technological research, the code named & quot; Proct 6 & quot; Heavy rare earth procts. Through the cooperation of the units participating in the war, the technological process has been got through, and the & quot; Proct 6 & quot; Samples. But the cost is very high, and it is difficult to implement instrialization. But then came & quot; Cultural Revolution;, The battle had to be suspended
after several twists and turns, the use of traditional experimental research methods have failed, but still not afraid of difficulties, indomitable, adhere to explore, and strive to tackle key problems. After hard work, we abandoned the traditional method of studying rare earth deposits in granite weathering crust, creatively adopted a variety of comprehensive technical means, such as rare earth soluble analysis and pulp resin adsorption, and finally graally opened up the problem; No mineralization & quot; Of & quot; Ion adsorption rare earth ore & quot; It's the secret of life.
Complex language recognition difficulties
the dialogue interface of modern chat robots mainly relies on speech recognition, so as to make convenient and rapid response according to user commands, such as "going to the meeting at 3 p.m." and "what's the weather like today". As a subjective way of expression, the rules of people's speech have certain variability. This is different from the computer program, people's expression is not completely subject to the rules, can freely choose words and sentences, and in order to convey information. In addition to local dialects, everyone also has their own way of expression, such as tacit "code language" or some specific "stem". This requires the chat robot to "de defamiliarize", only perfect keyword / keyword geographic keyword / keyword solution of structured language system will be difficult to meet the needs of a large number of users, which puts forward higher requirements for the chat robot system
In addition, it is difficult for chat robots to develop into a rigorous system e to the imperfect supporting facilities, which makes the first-time users complain about this. When the chat robot can be improved to a wide range of popularity, this is also the proct development needs to seriously consider the problem< br />