A recovery process of silicate iron tailings

Abstract

The invention discloses a silicate type iron tailing recycling process which includes concentrating, primary magnetic separating, secondary magnetic separating, and gravity separating through a centrifuge and a table concentrator. The process specifically includes: grading total iron tailings, magnetically separating a settled sand part to obtain highly-magnetic concentrate and final tailings, magnetically separating the highly-magnetic concentrate to obtain iron concentrate and magnetic separation tailings, and scavenging the magnetic separation tailings in the table concentrator to obtain iron concentrate and final tailings; roughing and concentrating the overflow part of the total tailings to obtain iron concentrate above 50%, combining the highly-magnetic tailings of the iron concentrate with the magnetic separation tailings obtained in the secondary magnetic separation of the settled sand part, and separating through the table concentrator; scavenging centrifugal tailings through the table concentrator, combining the concentrate of two highly-magnetic separations and fine table concentrator concentrate to obtain secondary iron concentrate, and allowing the fine table contractor tailings to the final tailings. The recycling process has the advantages that energy conservation and emission reduction can be achieved, qualified iron concentrate can be obtained, economical benefits can be increased, the problem that iron tailings occupy a large amount of land is solved, and specific gravity of iron tailings is lowered to create a prerequisite condition for tailing pipeline conveying.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of mine solid waste, and in particular relates to a recovery process of silicate-type iron tailings. Background technique [0002] my country consumes a lot of iron ore resources, and the domestic iron ore supply is seriously insufficient, and the import volume has increased year after year, which makes the problem of resource shortage in my country more and more prominent. [0003] Due to the large-scale mining and utilization of iron ore resources, by the end of 2010, the total amount of iron tailings in my country has reached more than 5 billion tons, which is about 40% of the total tailings, and is growing at a rate of 450-580 million tons per year; secondly, iron Iron tailings contain an average of 11% iron, and generally contain a variety of valuable metals that can be comprehensively recovered, such as Cu, Zn, S, Co, Ni, Au, Ag, Se, etc. Iron tailings undoubtedly become a po...

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Problems solved by technology

[0008] Domestic and foreign researches on iron tailings reprocessing and recovery are mainly aimed at ores with coarse particle size and large differences in specific gravity and specific magnetic susceptibility coefficient between gangue and iron minerals. etc. In terms of tailings re-election process, magnetic separation process, flotation process, regrinding-magnetic separation-repeated separation and other combined processes are mainly used; although domestic and foreign experts have carried out a lot of research work and achieved some good results. However, due to the regionality and complexity of iron ore resources, there is still a lot of work to be done, especially for fine-grained hematite and limonite, and gangues are iron-containing silicate minerals. However, there are few studies on the efficient and comprehensive utilization of iron ore resources with very similar specific magnetic susceptibility and specific gravity between silicate gangue and red limonite

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