Advances in technology of crushing and sieving and grinding grading of phosphate ore dressing

Shi Jianglin discussed the problems existing in the design and use of the common jaw crusher , and improved some defects to achieve beneficial results.

Yangbing Hua introduced role and characteristics of various phosphorus ore crushing crusher, focuses on the pump sizing and structural features of rock crushing equipment on the roll crusher through the installation and production practice, that high chromium cast iron roller pair low cost roll crusher, a uniform particle size of crushed rock phosphate, manganese steel high and long-life, is the best crushing device before the phosphate compound fertilizer production process into the ball mill.

The high-moisture phosphate ore screening equipment of the large-scale phosphate compound fertilizer device generally has the problems of low resonance damage, blockage and low efficiency. Jibo has realized the long, safe and stable screening equipment through production practice, transformation and exploration. "Full, excellent" operating status, and pointed out that the future screening technology will be developed in the direction of large-scale, heavy-duty, heavy-duty, anti-resonance.

The original crushing process of Dongtai Phosphorus Mine is unreasonable, the grinding equipment is aging, the production processing capacity is insufficient, the installation power and energy consumption are too large, and the environmental pollution is serious. Xiao Qingfei and others have carried out systematic transformation on the process of raw crushing process, in the process of process, dust removal, dry grinding, wet grinding and replacement of grinding equipment. The two-stage crushing ore grinding process is used to replace the two-stage grinding process of the crushing ore, so that the load distribution of the crushing and grinding is reasonable, and the multi-grinding and grinding are effectively realized; the washing and de-slipping process is adopted to reduce the entry into the crusher and the grinding. The sediment of the mining machine improves the efficiency of crushing and grinding; and the wet grinding is used in conjunction with the classifier. After the implementation of the transformation plan, under the condition of fineness, the grinding production capacity is increased by 3.5 times, the power consumption is reduced by 80%, and the impact of dust on the environment and equipment is reduced.

Wu Caibin and others believe that in the crushing process, not only the crushing strength has statistical phenomena, but also the particle size of the broken product has statistical phenomena. Following the method of statistical mechanics research, they studied the statistical mechanics of single spherical ball group breaking and the statistical mechanics of mixing spherical ball group breaking, and derived the statistical mechanics formula of single ball diameter ball group and mixed ball diameter ball group breaking. It provides a theoretical basis for the selection of the best spherical diameter or optimal ratio of the medium in the crushing process.

In the process of transforming the grinding process of Yuntianhua International Chemical Group Furui Branch, Tu Jianchun and Yan Renjing used the “closed-circuit” wet closed-circuit grinding process to overcome the dry grinding and wet open grinding. Defects improve grinding efficiency and greatly improve the working environment. After the modification of the grinding system, the dry ore content is ≥200 t/h, the product fineness of the product is -100 mesh mass fraction ≥80%, and the pulp mass fraction is ≥65%. A way to improve phosphoric acid production and increase phosphoric acid production and quality has been explored. In the transformation of the phosphate rock grinding system of Yuntianhua International Chemical Sanhuan Branch, Tu Jianchun et al. adopted a two-stage closed-circuit process (rough grinding-grading-fine grinding-dense) according to the grinding classification principle, and selected wet rod grinding. The machine, the wet ball mill, the oblique narrow flow classifier and the high-efficiency deep cone thickener are used together to achieve a good grinding and classification effect.

The Baosteel Wenyu gas iron ore is a low-depleted pyrite ore. The fineness of the iron mineral inlay is fine, which seriously affects the improvement of the capacity of the mill. Liu Chunguang introduced the original two-stage grinding to the public welfare clearing plant. The three-stage grinding and optimization and adaptation of other processes and equipment have greatly improved the processing capacity and concentrate grade.

Grinding efficiency and cost directly affect the ore dressing cost. Peng Cao and Liu Jianglin comprehensively analyzed the factors affecting the grinding process, and proposed to reduce the grindability of the ore, reduce the grain size of the mill, and change the structural parameters of the mill. Improve the classification efficiency, appropriately increase the amount of sand return, precise loading and ball filling, selective grinding and micro-stage grinding to improve the grinding efficiency, so as to achieve energy saving.

Zeng Guizhong et al. analyzed the effects of the diameter-to-length ratio of the mill, the type of liner and the speed of the mill on the selective grinding. It is proposed that the selective grinding can be achieved by adjusting the parameters of the mill. It is believed that there are many factors affecting the selective grinding effect of ore. In the adjustment of the mill, the short-type mill can obtain better selectivity; the graded liner can change the steel in the mill to some extent. The irrational distribution of the ball, in order to obtain a more accurate crushing force, the selectivity of the grinding action will also be improved; lower mill speed can also obtain better selectivity.

Wu Junjie and Dai Huixin comprehensively summarized the influence of material properties, ore size, grinding process selection, grinding medium materials and ratio, lining and other factors on the grinding process in the grinding process. In order to improve the grinding efficiency, Provide a reference for improving the grinding effect.

Du Maohua, Shi Guiming and Zhou Ping summarized the theoretical basis of the precise ball loading method. Based on the comparison of the typical methods for determining the diameter of the steel ball, the research method of precise ball loading in the application is given. Laboratory expansion and comparison of grinding experiments show that this method can improve the mill productivity, improve the particle size composition of grinding products, improve the dissociation degree, and improve the selection index, so as to scientifically and reasonably carry out the ball for production and improve overall. Grinding effects provide guidance.

Xiao Qingfei, Shi Guiming, Duan Xixiang introduced the types and influencing factors of fine grinding media, and proposed an effective new fine grinding medium material, and obtained from the comparative industrial test study on the grinding ability of steel ball and cast iron section, cast iron section It is a new type of fine grinding medium with high practicality.

Chang Fuqiang et al. studied the factors affecting the grinding efficiency of the ball mill, namely the grinding feedstock properties, the feed size, the mill parameters, the grinding concentration, the supplemental ball system, the classification efficiency and the sand return ratio, and proposed how to produce The method of improving the grinding efficiency of the ball mill can provide reference for improving economic efficiency and reducing energy consumption in production.

Luo Chunmei et al. studied the principle of ball mill function transformation. The research found that grinding is a process of internal energy increase. The main reason for the high energy consumption in the ball milling process is that the steel ball is randomly broken and easy to wear, and the size of the steel ball does not match the ore particle size. It is proposed to adopt energy-saving measures such as taking the size of the precise steel ball and adding the ball, selecting the appropriate medium size, etc. to save energy, without changing the process flow, but improving the efficiency of the plant selection and reducing the production cost.

Wan Xiao Jin in the use of oblique narrow flow fractionation technology base open ground phosphate rock mineral slurry grading test, and achieved good technical indicators, the new phosphate closed-circuit grinding and classification circuit design work for the first time using a 100 m2 oblique Narrow flow grading box. The production test results show that the classification equipment runs stably and the classification efficiency is as high as 61.79%. The excellent grading performance of the equipment improves the processing capacity of the grinding system and improves the particle size characteristics of the grinding products. The product granularity satisfies the technical requirements of the subsequent processes well, and the system has achieved satisfactory technical and economic indicators.

Wei Zhengkun analyzed that the relationship between the vertical sedimentation velocity of phosphate ore particles and the vertical ascending velocity of phosphate slurry is the key to the classification selectivity of the inclined plate classifier. Based on this, the method for controlling the classification selectivity of the inclined plate classifier is found. A corresponding production test was carried out. The test results show that the vertical ascending velocity of the phosphate slurry is as close as possible to the vertical sedimentation velocity of the phosphate ore particles to be classified, which is an effective method for controlling the classification selectivity of the inclined plate classifier.

Luo Chunmei et al analyzed the ore properties and the anti-crushing mechanical properties of the low-grade mixed phosphate rock in Anning, studied the influence of the rod diameter on the fineness of the phosphate rock, and solved the over-grinding problem in the rough grinding process of phosphate rock. Studies have shown that the best roughing rod diameter is φ85 mm. Excessive or too small rough grinding rod diameter, grinding effect is not good, only the grinding under the best rod diameter, low coarse mass fraction, less abrasive fraction, fine fraction quality and high productivity, The grinding effect is the best.

Wan Xiao Jin, research status and progress of mineral grading technology and equipment Du Jianming reviewed, from the structure and role of the principle highlighted in a spiral classifier, grading cone hydraulic equipment, mechanical stirring hydraulic classifier, cloud tin box-type hydraulic classification, Gravity hydraulic grading equipment based on oblique narrow flow grading box; centrifugal hydraulic grading equipment mainly based on krebs gmax cyclone and water seal cyclone; high in Dreeck high-frequency fine screen and GPS high-frequency vibrating fine screen Frequency vibrating screen. The structure and operation of the gravity hydraulic grading equipment are relatively simple; the hydrocyclone can be used for grading of fine-grained materials, but the stability is poor; the high-frequency fine screening has high screening efficiency, but the processing capacity is small; in production, according to the process and grading equipment Features to choose a grading device.

Wang Yong et al. discussed the influence of ore concentration and inlet pressure on the classification efficiency of the cyclone, and plotted the particle classification efficiency curves under different ore concentration and inlet pressure, which can provide some guidance for the actual production of the plant. The ore pressure can be adjusted according to the separation particle size and the classification efficiency.

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