Method for preparing magnet powder for ironmaking by magnetizing and roasting sulfur concentrated ore

Abstract

The invention relates to a method for preparing magnet powder for ironmaking by magnetizing and roasting sulfur concentrated ores, belonging to the technical field of comprehensive utilization. The method comprises the following technological steps: putting the sulfur concentrated ores at different stages into a diffusion-type fluidized bed roaster with a controlled furnace temperature of 800-900 DEG C to be magnetized and roasted; and respectively pumping oxygen-contained air according to a proportion into the furnace at three stages from the furnace bottom, a diffusion layer of the furnace body and the furnace top in a suitable oxygen supply mode to oxidize the sulfur concentrated ores in the furnace and generate sulfur dioxide and magnetized sulphuric acid sludge, remove sublimed sulfur and keep the normal production of sulphuric acid; sending the magnetized sulphuric acid sludge to a sorting storage chamber in a sludge mixed discharge mode or respective discharge mode; and finally, magnetically separating materials with the iron content lower than 60 percent stored in the sorting storage chamber by a magnetic separator so as to obtain the magnet powder for ironmaking. The method converts the prior oxidated sulphuric acid sludge incapable of being used as an ironmaking raw material into the underproductive magnet powder as the ironmaking raw material and has the advantages of reasonable technological flow, good economic benefits, environment-friendly effect, and the like.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of minerals, and relates to a method for preparing sulfur concentrate into magnet powder for ironmaking while producing industrial sulfuric acid from sulfur concentrate. Background technique [0002] Using pyrite to make industrial sulfuric acid (H 2 SO 4 ), the traditional process is to iron disulfide (FeS 2 ) is oxidized in the roaster to generate sulfur dioxide (SO 2 ) and iron oxide (Fe 2 o 3 ) powder, after solid-gas separation, sulfur dioxide is purified and catalytically converted into sulfur trioxide (SO 3 ), and then absorbed into concentrated sulfuric acid, the resulting sulfuric acid slag cannot be directly used as raw material for ironmaking due to its low grade of iron oxide, large fluctuations in grade and high sulfur content (greater than 1%), so it was mainly used as cement filler in the past, but its economical The benefit is poor, the price is low and diff...

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Problems solved by technology

[0003] Before the proposal of the present invention, some enterprises adopted the method of re-selecting the oxidized sulfuric acid slag to improve the iron grade, but this method has poor effect on improving the iron grade, and there are iron oxide powders with low sales price, difficult sales, and iron oxide powder. Low powder recovery rate and other issues; some enterprises are also studying the magnetization roasting method, but the blast volume and blast mode are unreasonable. Powder is also difficult to sell, and sublimated sulfur cannot be eliminated, which affects the normal production of sulfuric acid; and some enterprises can only use high-grade sulfur concentrate as raw material for magnetized roasting in order to increase the iron content of magnetized sulfuric acid slag. % of magnet powder, but the use of sulfur concentrate raw materials is narrow, and it loses its due economy

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