Comprehensive recovery of pyrite resources

A complex low-grade pyrite ore is complex in nature and diverse in structure and structure. Sulfur and iron minerals are mainly distributed in pyrite, magnetite and pyrrhotite. It is difficult to sort and rationally develop the mineral resources. Zhou Hepeng and others conducted research on the beneficiation process. The results show that the sulfuric acid with sulfur content of 41.35% and sulfur recovery rate of 83.37% can be obtained by closed-circuit test based on the process of “preferred sulphur-mineralization and magnetic separation of iron”. The iron ore concentrate with iron content of 64.86% and iron recovery rate of 76.35% has good test indexes, and sulfur and iron minerals have been well recovered.

Liu Jun and other self-developed LC1 as a collector , water glass is an inhibitor of gangue minerals, using copper-sulfur mixed-copper-sulfur mixed concentrate re-grinding-copper-sulfur separation principle process, for an iron ore The magnetic separation tailings were subjected to sorting test research, and obtained a copper concentrate with a copper grade of 22.13%, a copper recovery rate of 81.88%, a copper concentrate with a sulfur grade of 31.69%, and a sulfur recovery rate of 76.34%.

A pyrite mine in Inner Mongolia is a complex sulfide ore with sulfur as the mainstay and associated with low-grade copper and zinc. Liu Zhanhua and other high-sulfur iron tailings with iron grade of 17.75% and sulfur mass fraction of 5.87% were produced by flotation process. A series of exploration experiments on iron and sulfur reduction, such as magnetic separation, shaking, magnetic separation-reverse flotation and direct reduction roasting-magnetic separation, were carried out for this high-sulfur iron tailings. The results show that it is difficult to achieve the ideal sorting effect by conventional beneficiation method. The direct reduction roasting-magnetic separation method can obtain iron grade of 93.57%, sulfur mass fraction of 0.39%, and recovery rate of weak magnetic concentrate of 82.01. % of direct reduced iron products provide a new way to effectively improve the comprehensive utilization of resources.

A lead-zinc tailings contains 0.28% lead, 0.42% zinc and 15.87% sulfur. According to the ore characteristics of the mine, Ni Qinglin uses a spiral chute to conduct flotation after sedimentation, and obtains a yield of 45.59% under different experimental conditions. The mixed sulfur concentrate has a sulfur content of 31.22% and a sulfur recovery rate of 90.60%, which has good economic benefits. It provides guidance for the recovery of sulfur in the same type of lead-zinc tailings.

In order to effectively utilize the coal-based pyrite mine in Yunnan, Zhang Jing and others adopted a comprehensive recovery plan for coal preparation and pyrite selection. On the basis of multi-element analysis of ore chemical and sulfur speciation analysis, spiral chute-shaker re-election test and flotation test were carried out. The test finally adopts the flotation closed-circuit test process, first flotation coal, flotation out of the mine (the product is incorporated into the tailings), and then flotation of the pyrite, and finally the yield is 5.38%, the carbon grade is 40.32%, including Sulfur concentrate with a sulfur recovery of 7.05% and a carbon recovery rate of 33.76%; a yield of 24.00%, a sulfur grade of 47.59%, a carbon content of 9.64%, and a sulfur recovery rate of 72.74%, achieving the purpose of comprehensive recovery of coal and pyrite .

Xu Ming et al. studied the new technology of comprehensive utilization of coal-bearing pyrite in a certain area of ​​southern Sichuan. Through the selection of the full flotation process, a high-sulfur concentrate containing more than 49% sulfur can be obtained. After sulfuric acid is boiled and calcined to produce acid, sulfuric acid slag with residual sulfur less than 0.2% and iron content greater than 64% can be obtained, which can be used as ironmaking raw material, and flotation tailings can be recycled as building materials.

Hong Degui et al studied the process and process conditions for recovering iron fines from sulfur-containing magnetite tailings, recovering magnetic pyrite and magnetite by magnetic separation, roasting magnetically refined concentrate, and all the calcined to achieve iron fines quality. It is required that the process improves the utilization of mineral resources and can obtain better economic benefits for enterprises.

He Bingbing et al first carried out flotation recovery experiments on pyrite in tailings. The experiment discussed the effects of pulp quality fraction, pH value and HD flotation agent dosage on the flotation process, and obtained the best. The flotation conditions were: pulp mass fraction of 20%, pH of 8.5, HD flotation agent dosage of 200 g/t, sulfur concentration of w (S) = 29.48%, and w (S) of tailings decreased to 1.13%. After desulfurization, the carbon and organic matter in the tailings tailings were removed by high temperature calcination. The optimum calcination temperature was 750 °C and the calcination time was 2 h. After calcination, the iron in the tailings was removed by chemical method. The optimum amount of strong reducing agent was used to obtain a primary kaolin with a whiteness of 64.8%.

Lu Jun conducted an experimental study on the recycling of a copper tailings. The full flotation process was used to efficiently recover the useful components. The obtained indicators were: ultra-pure sulfur concentrate S grade of 51.12%, containing Cu 0.13%, Fe 45.7 %,S recovery rate is 49.18%; alumite concentrate SO3 grade 23.99% (purity alumite mass fraction 62.15%), SO3 recovery rate 72.65%; dickite coarse concentrate A12O3 grade 22.08% (pure ground stone quality score 80.53 %), the recovery rate of A12O3 is 65.25%; the final tailings SiO2 mass fraction is 91.99%, which can be used as smelting flux, cast quartz sand or building materials.

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