Phosphate ore beneficiation tailings, three waste treatment
Dai Xinyu conducted a pilot study on the characteristics of a phosphate ore flotation tailings using a weak magnetic separation iron -strong magnetic pre-selection- titanium flotation process. The results show that after two pre-selection of Slon-750 high-gradient magnetic machine, the obtained magnetic separation coarse concentrate has reached the requirement of titanium flotation. The EM121 is used as the collector of ilmenite. With four selections, a titanium concentrate with a TiO2 grade of 45.97% and a recovery rate of 51.50% can be obtained.
The P2O5 grade of a phosphate mine tailings in Hubei is 14.86% and the mass fraction of MgO is 4.01%, which has a high recycling value. Yu Jun et al. used the positive and negative flotation process to enrich and recover the properties of the ore sample, and obtained phosphorus concentrate with P2O5 grade 29.05%, recovery rate 81.04% and MgO mass fraction 0.96%, and realized phosphate mine tailings. Reuse.
The P2O5 mass fraction of a phosphate rock in Yunnan is 20.08%. The main phosphorus-containing mineral is fluoroapatite. The mineral grain size is uneven and the phosphorus is enriched in the coarse fraction. Chen Xianmei et al. performed a flotation test on the recovered phosphorus. The results show that when the grinding fineness is -200 mesh and 70%, the self-made LC3 is used as the phosphorus mineral collector, and the scrubbing sludge is processed by the 2 coarse 2 sweeping 3 fine minerals sequential returning process. Phosphorus concentrate with a P2O5 grade of 28.38% and a recovery of 98.67%.
The main mineral in a phosphate ore in Sichuan is colloidal phosphate, and the gangue mineral is mainly dolomite. Sun Yuanyuan re-selected the phosphate ore fine-choice tailings, and the recovery rate of the comprehensive concentrate P2O5 increased from 90.95% to 95.97%. The tailings were re-selected without ore mining, crushing, screening, etc., production costs. low.
Zhou Jiejiang for scrubbing a place other silicon Yunnan calcium tailings, SJ-01 for the use of modifiers, selected crude water glass, with a selection of FS as the inhibitor complex agent, sodium oleate and coal oil emulsion as collector The flotation process has obtained a flotation index of P2O531.05% concentrate and 86.08% recovery rate.
Zhao Wuqiang et al. studied a method for recovering P2O5 from phosphate ore beneficiation tailings. The tailings produced by the P2O5 mass fraction of 5% or more produced during the ore dressing of carbonate-type phosphorite phosphate ore, hydrocyclone Pretreatment, the tailings are divided into two parts of less than 56 μm and more than 56 μm, of which less than 56 μm part with most of the residual ore dressing agent directly into the beneficiation, more than 56 μm part of the ball mill is ground again less than 56 μm, together Enter the beneficiation. The method firstly separates the tailings according to the coarse and fine fractions, and the coarse fraction is subjected to secondary grinding to solve the problem of mineral monomer dissociation. The fine fraction does not participate in grinding, reducing ore crushing and ore silting. The tailings containing a large amount of residual chemicals are classified, and the agent can be separated from the coarse particles by the fine particles, and can be recycled, and the tailings can be re-selected with little or no collector. The method improves the recovery rate of phosphate rock resources, reduces the tailings discharge amount, meets the requirements of circular economy, and is suitable for phosphate ore dressing enterprises.
Wu Guolan et al. screened the tailings of the phosphate ore heavy medium beneficiation, and the sieved material was again subjected to heavy medium beneficiation to obtain a phosphate concentrate with a grade of about 27.5%, which reduced the grade and production cost of the tailings and increased the phosphate rock. The recovery rate and comprehensive utilization of resources have increased considerable benefits for enterprises.
Zhao Jianguo and others based on the characteristics of phosphorus and flotation tailings rich in magnesium and silicon, used as raw materials, calculation of calcium magnesium phosphate fertilizer production ingredients, product manufacturing cost measurement and comparison, preliminary investment benefit analysis, for the utilization of phosphate rock flotation tailings The development and production of calcium magnesium phosphate fertilizer provides a basis.
Li Wei and others used lime as a coagulant and polyacrylamide as a coagulant to treat high-concentration phosphorus-containing flotation wastewater from a phosphate ore dressing plant in Jingmen, Hubei. The phosphorus removal rate was as high as 99.85%, while CODcr and SS were The removal rates reached 75.3% and 81.2%, respectively, which met the first-level standard in the National Integrated Wastewater Discharge Standard. The effluent water is clear and transparent, and the look is excellent.
Wang Guangming and others have faced the problems faced by several methods of domestic dry tailings of phosphorus tailings. The use of automatic vertical filter presses in the dry tailings of phosphorus tailings has been successful, and the filter cloth is easy to solve. There are two major problems, such as blockage, breakage and high equipment failure rate. Each filter cloth has a usage time of 90 days and a monthly maintenance time of no more than 12 hours. A major breakthrough has been made in the dry tailing technology of phosphorus tailings.
Yang Liyuan systematically studied the effects on the properties of aerated concrete products by adjusting the process parameters of various main components, water-to-material ratio and slurry temperature, and analyzed the mechanism of product strength. Studies have shown that the use of more than 65% of the phosphate tailings, 6% cement and 0.14% aluminum powder, in the ratio of water to 0.64, the temperature is good can be made when the blank 45 ℃, under autoclave conditions, the article The weight can reach 600 kg/m3, and the compressive strength can reach 3.7 MPa or above.
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