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Wu Jianming < sup > 1 < / sup > Cao Yongxin < sup > 2 < / sup >
(1; 2. BASF mineral procts (Shanxi) Co., Ltd., Shuozhou, Shanxi 036800)
Abstract GJ 5 × The large-scale double tank high-strength agitating mill is the latest ultra-fine grinding / stripping equipment in the domestic ultra-fine material processing, and it is also one of the largest equipment in this field. The equipment adopts such innovative technologies as double impeller agitator, square cross-section double groove tank body and load starting method. The equipment has large proction capacity, high grinding efficiency, fine particle size and continuous proction. The structure of the equipment is novel and easy to install, operate and maintain. The machine has been successfully used in the coal series calcined kaolin stripping of a kaolin company. Under the proction capacity of 1.2 ~ 1.5 T / h, the fineness of single unit proct can reach - 2 μ M 85% ～ 90%, two in series up to - 2 μ m 94%
key words GJ 5 × 2 large double tank high strength stirring mill; Superfine grinding; Coal series calcined kaolin
About the author: Wu Jianming (1951 -), male, researcher of Beijing General Research Institute of mining and metallurgy, engaged in research and development of crushing engineering. Mailing address: No.1 waiwenxing street, Ximen, Beijing, 100044Cao Yongxin (1970 -), male, senior engineer, general manager of BASF mineral procts (Shanxi) Co., Ltd. Correspondence address: Pinglu District, Shuozhou City, Shanxi Province, 036800
In recent 30 years, the research and development of ultra-fine material processing equipment has been developing continuously and rapidly. This is because: (1) many instrial minerals and materials will proce higher surface energy after grinding to ultra-fine particle size, with fast chemical reaction speed, large adsorption capacity, good filling and reinforcement performance, low sintering temperature, high strength of sintered body, and unique dispersion, rheological, electrical, magnetic and optical properties, so as to meet the special application requirements, Or proce high performance and high value-added procts. Therefore, various ultra-fine materials are widely used in modern instry, high-tech instry, new material instry and other related fields, such as high-performance ceramics, microelectronics and information materials, plastics, rubber and composite fillers, papermaking fillers and coatings, high-performance pigments and coatings, high-performance lubricating materials, fine abrasives, high-grade refractories, fine chemical procts, high-grade cosmetics Textile auxiliaries, medicine and health care procts, etc. The rapid growth of demand for ultra-fine materials promotes the continuous expansion of proction scale. ② With the development of mineral processing technology, especially the progress of fine mineral processing method, it has been able to achieve ≤ 10 μ Effective separation of M. As a result, the recovery of useful minerals and useful components from tailings, which are difficult to be treated in the past, has entered into the actual proction stage, and has attracted more and more attention e to the increasing dilution and shortage of mineral resources and the increasing depth and breadth of the recovery and utilization of useful minerals. These new applications or processing requirements need to use ultra-fine grinding, ultra-fine grinding equipment has become an important and essential equipment in this processing field Research and development status of stirred mill at home and abroad. In 1939, the U.S. Bureau of Mines designed and manufactured a kind of equipment for cleaning mineral surface before flotation. From the late 1950s to the early 1960s, it was improved to USBM vertical stirring mill, which was used for stripping kaolin and mica and superfine grinding of bismuth oxide. In 1948, Du Pont developed a high-speed agitating mill sand mill, which was mainly used for the proction of paint instrial pigments, making the agitating mill obtain significant development. In the 1950s, a new type of stirred mill, tower mill, was developed by kopper tower mill of Japan, which was widely used in the field of ultra-fine grinding and chemical treatment. From 1960s to 1970s, the discharge device of agitating mill was improved, and the speed of agitator was increased continuously. From 1969 to 1972, IMPEX invented the patent technology of high-strength ultra-fine stirring ball milling (flaking) and developed FMM double tank high-strength stirring mill. The equipment adopts vertical tank with square section, which has the advantages of high stirring speed, high efficiency of ultra-fine grinding, large proction capacity and continuous proction. It is used by several kaolin companies in Georgia, USA. From 1970s to 1980s, the agitating mill with disc agitator appeared abroad, which is characterized by small grinding chamber volume, multi disc agitator, high rotating speed, and circumferential speed up to 8-10 M / s. 60% ～ 80% of the grinding cavity is filled with medium. Because the volume of grinding cavity is small, the medium mass is also small. Therefore, its agitator not only plays the role of stirring, but also plays the role of grinding < sup > [1] < / sup > At present, there are three representative advanced stirring mills in the world, i.e. isa mill with disc stirring element, vertimill mill with spiral stirrer and detritor mill with rod stirring element The ISA mill developed by Mount Isa mines of Australia and Netzsch feinmahltechnik of Germany is a kind of high energy density agitating mill with horizontal disc agitator. The circular speed of the disc is up to 20-23 M / s and the motor power is 2.6-3 MW. Its largest model is m10000, with a volume of 10 m < sup > 3 < / sup >, which is the largest stirring mill with specifications, power and capacity in the world. At present, 25 isa mills have been put into operation in Australia, South Africa, Kyrgyzstan and the United States. Isa mill is mostly used for regrinding of concentrate, and self grinding can be realized when ore is used as medium. For example, in McArthur River Mine, the 0.8-1.8 mm particle size of the first stage autogenous mill discharge is screened by vibrating screen as the grinding medium of ISA mill, and the flotation coarse concentrate is separated from 45 μ M 80% open circuit grinding to 7 μ m 80% Isa mill can also replace closed circuit grinding of ball mill or tower mill in fine grinding stage, for example, in kumtor gold mine, from 135 μ M 80% open circuit grinding to 62 μ The power consumption is less than half of that of regrinding ball mill, and the hydrocyclone and its feed pump are omitted The vertical mill was invented by Kubota tower mill company in 1950. In 1979, the American MPSI company purchased the Japanese patent of tower mill, which is called vertical stirring mill and used in lead-zinc mine, gold mine and other instrial sectors. With the merger between enterprises, the vertical mill was owned by Svedala group of Sweden in the early 1990s, and then by Metso group of Finland in the late 1990s. The peripheral speed of the mill's spiral outer edge is about 3 M / s, the medium is 12-30 mm steel ball, the allowable feed particle size is coarse, and the proct particle size is usually 10-20 mm μ At present, the maximum installed power of the equipment is 1100 kW The detritor mill is also a vertical stirring mill manufactured by Metso group of Finland. The linear velocity at the end of the stirring rod is about 11 m / s, the medium is about 1-2 mm ceramic beads or sand, and the optimal feeding particle size is 50 μ The particle size of the proct can reach 10 μ It is less than 5 m. At present, the maximum installed power of the equipment is 355 kW. A total of 21 sets are used in zinifex century zinc mine in Australia, of which 6 are used for regrinding and 15 for superfine grinding (2) domestic situation since the late 1980s, China has started to introce and develop various stirring mills and stripping machines, mainly including the following Batch stirred mill based on 200-sl stirred mill of united process company, sj-90 stirred mill and zjm stirred mill are developed in China. The main features of the mill are as follows: the tank is vertical barrel shaped and fixed; The agitator adopts round bar shape agitator; The stirring speed is low, so it belongs to low intensity stirring mill; Wear parts such as tank and agitator are lined with polyurethane; The circulation pump is used to make the material circulate to ensure uniform grinding; The material is cooled by the interlayer or external cooler. This kind of stirred mill has low grinding efficiency, small and medium size, which is suitable for small-scale batch proction, but not suitable for large-scale continuous proction BP (MB) series flaker and gsdm-400 stirring mill are vertical wet continuous operation high-intensity stirring mill with disc stirrer. The cylinder of BP (MB) series peeling machine is lined with corunm or polyurethane elastomer, and the agitator is lined with polyurethane elastomer. The installation power of BP80 peeling machine was 30 kW, the cylinder volume was 0.080 m < sup > 3 < / sup >, the whole machine weight was 2.5 T, and 8-10 sets were needed for continuous operation in series. After amplification to mb300 type stripping machine, the cylinder volume is 0.3 m < sup > 3 < / sup >, the installation power is 75 kW, and the whole machine weight is 5 T. when it is used to treat coal series kaolin, the output of four sets in series can reach about 1.5 T / h, and the proct particle size can reach - 2 μ M is about 90%. At present, the largest specification is BP 500, the volume of cylinder is 0.5 m < sup > 3 < / sup >, the installed power is 132 kW, and the total weight is 12.5 t The structure principle of gsdm-400 agitator mill is similar to that of BP (MB) series stripper. The inner liner is made of aviation rubber or corunm, and the outer liner is made of aviation rubber. There are three working modes: external circulation mode, multiple series continuous grinding mode and batch grinding mode. The cylinder volume is 0.408 m < sup > 3 < / sup >, and the installed power is 30-45 kW. When superfine grinding test was carried out with - 325 mesh Shuozhou coal series kaolin, the optimum concentration of grinding was 30% to - 2 μ The treatment capacity is about 260 kg / h < sup > [4] < / sup > The screw agitating mill is a kind of agitating mill with screw agitator, which has large height diameter ratio and low stirring speed. It belongs to low-intensity agitating mill and is suitable for wet or dry operation in coarse stage of fine grinding, regrinding or superfine grinding Large agitating mill with large height diameter ratio × wide × 2 m in height) × 2.2m × 8.5 m Cym-5000 large-scale ultra-fine agitator mill adopts polygonal cylinder and disc agitator, with volume of 5 m < sup > 3 < / sup >, installation power of 315 kW and overall dimension of (long) × wide × The height is 2 m × 2 m × 11 m These two kinds of mills have been developed in recent years, which have high stirring mill strength and proction capacity (3) gj5 × 2 development and application of large double tank high strength stirring mill × 2. It is mainly composed of tank, motor, recer, belt drive, isolation screen, agitator and electric control cabinet. The tank is composed of two cuboidal tanks of the same size connected at the bottom, with a total volume of 10 m < sup > 3 < / sup >. One of the two grooves is used for pre grinding and is provided with a feeding port; The other one is used for fine grinding, with isolation screen and discharge port. The tank is filled with 8-10 t grinding medium with particle size less than 5 mm, and the volume of medium and pulp accounts for about 60% of the grinding chamber volume. Each tank is equipped with a set of agitator and a set of driving device above the tank. A discharge port and a compressed air inlet are respectively arranged at the bottom of the two tanks. The top of the groove is provided with an exhaust pipe. The appearance of the equipment after manufacturing is shown in Figure 1
Table 1 gj5 × 2. Main technical performance indexes of large-scale double tank high-strength stirring mill (3) application effect
gj5 × 2. The research and design of large-scale double tank high-strength stirring mill started in 1997. In July 1999, the first gj5 × 2 large double trough high strength mixer
if it's near Huanbei, take No.90 bus to Huanbei
if you're afraid of running, take the No.4 or No.7 bus to Guanghua gate to change 90
bus line: No.49, about 3.2km in length
1. Walk about 30m from West Street (Zhonghuamen coach) to West Street (subway Zhonghuamen station)
2. Take No.49, pass 6 stops, and reach the network map of Confucius Temple Station
< p class = "f-aid" style = "margin: Auto;" > This data comes from the network map, and the final result is subject to the latest data of the network map
In addition, you can choose several other routes:
Route 1: No.33 bus (the whole journey is 10.5km long and takes about 50 minutes)
Nanjing railway station (walk 300m) → west square station of Nanjing railway station (take No.33 bus, 13 stations in total) → Changle Road Station (get off and walk 560m) → Nanjing Confucius Temple
Route 2: No.44 bus (the whole journey is 11.2km long and the distance between the bus and Confucius Temple is less than 1.5km, It takes about 1 hour and 10 minutes)
Nanjing railway station (walk 900 meters) → East Square Station of Nanjing railway station (take bus No.44, 14 stops in total) → Confucius Temple Station (get off and walk 540 meters) → Nanjing Confucius Temple
route 3: Taxi (11.3 km, 19 minutes)
Route 4: self driving (11.3 km, 14 stops in total), It takes about 19 minutes)
Nanjing railway station → Longpan middle road → Changle Road → Nanjing Confucius Temple