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A small crushing and screening plant beneficiation
Small ore dressing plants are generally not subject to inspection and screening due to factors such as infrastructure investment and plant site. However, a fixed grid must be provided in the upper part of the original mine silo to control the feed size of the incoming crusher . This is because although the small ore dressing plant has a small amount of ore processing, the maximum ore size of the ore is still large. When selecting coarse crushing equipment, the contradiction between the less processing of the ore and the larger grain size of the largest ore is taken into account. At present, the coarse crusher is generally selected from the PEF250×400 jaw crusher. The mesh size of the sieve is designed to be 200×200mm2. The individual crusher of the 100ton/day concentrator also has the PEF400×600 type. The miner, so that the size of the sieve can be designed to be 330×330mm2. The ore is manually crushed on the sieve to 200×200mm 230×330mm2. The fixed grid is welded by a light rail of 12kg/m ordinary carbon steel. The crushing process of the small ore dressing plant is usually designed as a two-stage open-circuit process. As mentioned above, the coarse crusher should use the PEF250×400 jaw crusher, and the fine crusher should use the PEF150×750 jaw crusher. The cone crusher is rarely used because of its complicated structure, heavy weight, large size and high price. It is important to propose that the fine crushing equipment, impact crusher and hammer crusher have the advantages of simple structure, small volume, large production capacity and high crushing ratio, which can make the product particle size reach 6mm or less, and should be a small concentrator. ideal crushing equipment, it also has a design in Ruyang County Red star had chosen concentrator, used in Luoning Qing Ping Kong gold ore concentrator. The production practice proves that the use of this type of crusher can make the product particle size less than 6mm, which can increase the production capacity of the plant by about 15% and the production cost by about 5 yuan/ton compared with the conventional crushing process. However, in the end, due to the excessive wear of the hammer and the counterattack, the material quality has not been fundamentally solved. Finally, at the request of the factory workers, it was changed to a PEF 150×750 jaw crusher. However, with the continuous development of science and technology, as long as the material quality of the high-speed hammer and counterattack can be improved, these two kinds of equipment should become the ideal fine crushing equipment for small concentrators.
Second, grinding and grading
1. Grinding and Grading Process The grinding and grading process is mainly determined by the particle size of the grinding product, which is to make the selected minerals reach the monomer cleavage. The gold concentrator and non-ferrous metal concentrator in the western Henan area generally require a particle size of 65%-200 mesh, which is a medium-hard ore. Therefore, the production process basically uses a one-stage closed-circuit grinding grading process.
2, grinding equipment according to the characteristics of each period and a closed-circuit grinding device requires grinding and classification process, grinding equipment more appropriate choice of lattice-type ball mill, in production practice, it is also chosen substantially lattice-type ball mill. However, since 1998, a new type of cone ball mill is gradually replacing the traditional lattice ball mill. Compared with the traditional lattice ball mill, the conical ball mill mainly improved as follows: a. The ball mill discharge end was changed to a conical type, and the grid plate was removed. The advantage of this modification is that the steel ball is arranged in the cylinder body according to the size of the ball diameter under the action of the cone of the discharge end, and the ball mill gives the large end of the ore end, which mainly impacts and crushes the large-sized ore which has just entered the cylinder body. The ore-receiving end is a small ball, which mainly grinds and pulverizes the small-sized ore, so that the grinding process of the ore in the cylinder is optimized, and the grinding efficiency of the ball mill is improved. This has been proven in production practice. b. Change the transmission part of the ball mill from the bearing type to the double-sided bearing, which makes the ball mill easy to install, and is easy to maintain and lubricate. In addition to the above two, the improvement of the cone ball mill has many other places. In short, after nearly two years of use in the Qinggangping plant of the Gansu gold mine in Luoning, Henan, it feels that this type of equipment is operating normally, compared with the traditional lattice ball mill. The ratio has the advantages of light weight, low energy consumption, low noise, low steel consumption, convenient maintenance and high production efficiency.
3. Grading equipment According to the technical performance of the classifier and the product size of 65%-200 mesh, the grading equipment should use the sorghum type single spiral classifier. When selecting the specifications of the classifier, it is necessary to fully consider the factors of small equipment, low degree of automation, unstable production operation, and poor technical operation level. In the formula: after calculating the classifier specifications, the actual selection should be increased. One specification. For example, the specifications of the classifier that need to be configured in the 50-ton/day concentrator are: If the FLG-750 is selected in the actual selection, it is theoretically feasible, but in actual production, due to unstable production operation and poor technical operation level, the grading products are often made. Failure to meet the requirements reduces the recovery rate of recycled minerals. For example: Henan Ruyang Wang Ping gold lead ore concentrator and concentrator Ruyang Donggou pay shop, two concentrator with 50 tons / day production specifications, the nature of the ore processing is basically the same, Wang Ping concentrator choices are FLG -1000 classifier, Donggou Concentrator selected FLG-750 classifier. In 1992, the production of Zhongping Pingling Concentrator has been stable, the annual recovery rate, and the ore dressing index of Donggou Concentrator The time is good and bad, very unstable, the annual recovery rate is only, in the production of several years, their operators have also exchanged, but the ore dressing index of Donggou Concentrator has not been stable with the indicators of Wangping Concentrator. The annual cumulative recovery rate is lower than 2%. The use of a conical ball mill significantly reduces the installation power compared to the use of a lattice ball mill.
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