Method of producing high grade magnetic concentrate from sulfuric-acid residue composite pellet

Abstract

The invention discloses a high-grade magnet concentrate preparing method of sulfuric slag composite ball, which is characterized by the following: adopting reducing sintering method; conversing hematite in the sulfuric slag into magnetic ore; dissolving harmful element (Cu, Zi, S) in the salt; rolling sulfur in the non-magnetic phase or easily soluble sulfate; using wet magnetic cobbing technology to enrich iron; removing the harmful element.

Description

technical field

[0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for preparing high-grade magnetite concentrate by reducing and roasting sulfuric acid slag composite pellets. Background technique

[0002] Sulfuric acid slag is a waste residue produced during the production of sulfuric acid. Due to the different composition of pyrite raw material for the preparation of sulfuric acid and the difference in roasting process, the composition and properties of sulfuric acid slag are not the same: first, the iron grade fluctuates greatly, generally 30% to 55%, SiO 2 >10%; the second is that there is unburned sulfur in the sulfuric acid slag, generally above 1%; the third is that some contain a small amount of non-ferrous metals and precious metals. In addition, during the roasting process of pyrite in fluidized bed furnace, iron is oxidized to Fe 2 o 3 , The slag phenomenon on the surface of the particles is serious, so the spher...

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