1. Pyrite ore separation technology
Zhang Dexing, etc. In the process on the basis of mineralogy pyrite, copper ore to Dongguashan new technology research carried dressing. Independently developed an environmentally friendly new activator, which can completely replace sulfuric acid and greatly improve the recovery rate of pyrite. The process of magnetic flotation after the first magnetic separation can greatly improve the grade of the magnetic concentrate. The magnetic separation dispersant was independently developed to fully disperse the slurry and facilitate the separation of magnetic minerals. Closed-circuit tests and industrial tests were carried out on the basis of laboratory tests. Industrial test results show that the grade of sulfur concentrate has increased from 31.5% to 35.8%, and the total sulfur recovery rate has increased from 25% to 55%, which has created good economic and environmental benefits.
The production of high-quality sulfur concentrates from pyrite can expand its application and increase the added value of products. Ou Liming and other pyrites were used as experimental research objects. According to the mineralogical characteristics of gangue minerals and quartz in the ore, the technical schemes of high-quality and high-grade sulfur concentrates were determined, and the total resource utilization rate reached 87.69%. . In the test, the technical route of pre-flotation decontamination-acidified water glass high-efficiency inhibition-crude concentrate re-grinding was selected, and high-quality sulfur concentrate with high added value was obtained. The main factors affecting the quality of high-quality sulfur concentrate were discussed. factor.
Zhang Qun et al. used a flotation process to sort a pyrite in Guizhou. The test results showed that the grinding fineness was -0.074 mm, accounting for 79.44%, the collector GY dosage was 380 g/t, and the 2# oil consumption was 150 g. Under the condition of /t, using a rough selection, one-selection, one-sweep closed-loop flotation process, a sulfur concentrate with a sulfur content of 45.36% and a recovery of 80.55% can be obtained. The sulfur content in the tailings is only It was 2.96% and the loss rate was 19.45%.
Wang Yingru et al. re-milled the pyrite concentrate, and in the case of grinding fineness of -74 μm, accounting for 95%, the use of open-circuit flotation and the use of conditioning agents WHL-Y1, WHL-Y2 can effectively Excluding impurity minerals such as MgO, a high-quality sulfur concentrate containing 45.37% of sulfur is obtained.
Li Qingxin introduced the process route, process parameters and various factors affecting the normal operation of “activated wastewater flotation, improved sulfur concentrate grade, high-grade sulfur concentrate boiling roastingâ€. The implementation of the process has achieved the goal of comprehensive utilization of sulfuric acid slag. Since the project was put into operation, the system has been operating stably. The grade of sulfur concentrate is 49.66%, the recovery rate of sulfur-selecting operation is 95.42%, and the grade of sulfuric acid-slag iron is 65.22%. The mine consumption is 0.678 t, and the ton of acid is 0.45 t.
In order to improve the iron grade of pyrite cinder and realize the full utilization of pyrite resources, the instrument has selected laboratory and industrial selection for low grade pyrite with w(S) of about 17% and 21% respectively. test. The industrial test results show that the average w (S) of the selected sulfur concentrate is 51.09%, and the sulfur recovery rate is 90.85%. After boiling, the concentrate has an average w(Fe) of 65.11% and w(S) of 0.21. % iron concentrate, in line with ironmaking raw material standards.
Hu Tianxi et al analyzed the ore properties of a high-carbon pyrite mine in Yunnan, and carried out a series of tests such as flotation decarbonization test and flotation sulfur selection test. On this basis, the research and development of the flotation closed-circuit test program was carried out. The high-quality ferrite iron with the sulfur grade of 47.52%, the comprehensive recovery rate of sulfur was 62.43%, the iron grade was 40.54%, and the carbon grade was only 0.65%. Mineral concentrate.
Liao boat to a place other Yunnan pyrite coal-based study utilization of new technology, floating joint process by re-sorting a low carbon sulfur-sulfur concentrate more than 47% of the residues obtained after boiling sulfur concentrate roasting acid Sulfuric acid slag with less than 0.3% sulfur and more than 65% iron can be directly used as raw material for iron making.
Aiming at the problem that the carbon content of coal-based pyrite concentrate is not conducive to roasting acid production, Liao Zhou and Xu Bin conducted a study on carbon reduction and sulfur extraction from a high-carbon coal-based pyrite ore in Yunnan. The test results show that the K-1 agent is a new carbon-selective collector, and the reverse flotation decarburization and selective flocculation methods can effectively reduce the carbon content of the sulfur concentrate and improve the sulfur concentrate grade. The experiment adopts reverse flotation-positive flotation-selective flocculation process to obtain coal-based pyrite concentrate with sulfur grade of 37.19% and carbon content of 3.64%. The sulfur recovery rate is 87.37%.
Kitayama lead zinc ore dressing plant selected from the production of sulfur have been used over the spiral flow cell reselection and shaking and flotation "Ammonium" process, since the technical and economic indicators of these sorting methods are poor, and so on by Wei Botao After the experiment, the "sulfuric acid method" floating sulfur process was adopted, and the technical indicators and economic benefits were significantly improved.
Hu Kaiwen et al studied the process mineralogy of a carbonaceous pyrite in Guizhou and explored its mineral processing technology. The results show that the particle size distribution of pyrite in the ore is extremely uneven, and there is pyrrhotite, and some pyrite oxidation is serious. The difficulty in the selection of the mine lies in the recovery and enrichment of fine-grained pyrite. The process of first re-election (shaker) and flotation is determined by analysis, and the open-circuit test process is optimized. The S grade of the concentrate product obtained by re-election is 28.96%, and the recovery rate is 72.19%. The refined product of re-selected concentrates after optimization flotation has an S grade of 42.76% and a comprehensive recovery rate of 43.50%. The refined product S grade after re-selection of tailings optimized flotation is 19.59%, and the comprehensive recovery rate is 10.04%. The results show that the process of flotation after re-election is suitable for the separation of the ore and can achieve good results.
Xu Xiaoping reviewed the re-election of Yunfu low-grade pyrite ore. When the ore is about 28% sulfur and the particle size is less than 4 mm, the final refinement process of coarse-grained jigging-fine-grain spiral sorting can obtain the final sulfur concentrate grade of 37.11% and sulfur recovery rate of 84.06%. The indicator points out a new path for the development of low-grade pyrite mines.
For the low-grade ore in the Yunfu Pyrite Mine, look for economically reasonable, low-cost and high-efficiency and environmentally friendly beneficiation process to recover sulfur, so that the obtained sulfur concentrate products meet the sales requirements, and the tailings contain sulfur to reach the pyrite tailings. Emission Standards. Li Hanwen and others used the grading-coarse jigging-fine-grain spiral process. The obtained sulfur concentrate contained 35.50% sulfur, the recovery rate of sulfur was 86.70%, and the tailings contained 6.70% sulfur.
2. Associated pyrite ore separation technology
A copper-sulfur ore in Inner Mongolia uses chalcopyrite, pyrrhotite and pyrite as the main useful minerals. The concentrator has only selected copper, and the sulfur has not been recovered due to its low grade. Fang Xihui et al. adopted the “low alkali priority floating copper-copper tail cleaning activated sulfur selection†test scheme, using copper high-efficiency collector QP-03, sulfur cleaning high-efficiency activator QH-01 to improve copper recovery rate and achieve sulfur synthesis. use. Experiments show that the copper concentrate with copper content of 20.60% and copper recovery rate of 93.44%, sulfur concentrate with sulfur content of 32.20% and sulfur recovery rate of 86.04% can be obtained. Compared with the original process, sulfur is comprehensively recovered. Copper grade and copper recovery rate increased by 0.5% and 2.47%, respectively.
Chen Yu et al. conducted a selective test on Yunnan Yangla copper-bearing pyrite. The flotation process of a crude two-sweeping two fines was used to obtain a sulfur concentrate with a sulfur grade of 33.21% and a recovery rate of 95.98%. The iron content was 48.16%, including 1.61% copper, gold containing 0.6 g / t. It can be used in the production of sulfuric acid to obtain copper-containing slag containing more than 60% of iron grade, which creates conditions for the recycling of copper, iron and gold resources.
Rao Qiangjian introduced the process of using a preferential flotation copper, copper tail flotation sulfur, and sulfur tail iron selection in a low-copper low-sulfur magnetite in Fujian, and achieved a good selection index, using high-efficiency and strong selective collectors. ZP-101, low price and low pollution of NH4HCO3 have significant effects on improving copper selection index and early desulfurization of iron concentrate.
In order to effectively recover the pyrite in a lead-zinc tailings in Fujian, based on the research of process mineralogy, Chen Xiangxiang and others determined the simple and easy industrialization of the whole sulfur flotation process. In view of the low-grade refractory pyrite which is inhibited by lime, it is enhanced and activated by a highly efficient and clean dispersive combination activation method, which increases the sulfur grade from 8.41% to 33.15% and the sulfur recovery rate to 81.11%. Pyrite has been well recovered, with significant environmental and economic benefits.
Wei-Qin warm properties and the like by analyzing the characteristics of a high tin ore pyrite and production process equipment, study visits, the original production process equipment and process conditions transformation, tin metal recovery increased from 50.19% before the transformation At 70.41%, the recovery rate of tin metal has increased by 20.22%, the recovery rate of sulfur has also increased from 39.20% to 84.36%, and the annual output has increased by about 200,000 tons of sulfur concentrate, which has achieved good economic benefits.
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