Method forpreparing iron concentrate for making iron from phosphorus-containing oolitic hematite

Abstract

The invention discloses a method of producing iron ore concentrate containing roe - like phosphorus hematite for iron manufacture, comprising crashing the roe - like ore, wet grinding until the hematite of granularity < 0.074mm are 40-60 mass% of whole hematite, adjusting the pulp mass percent concentration to 20%-30%, adding the water glass as dispersant of 0.5-1.0kg / t, agitating adequately, selecting by helix shoot, grinding produced ore concentrate until the one with the granularity < 0.074mm are more than 80 mass%, having the water glass as dispersant of 0.2-0.5kg / t, agitating to disperse uniformly, then selecting by shaking table, washing produced iron ore concentrate in room temperature by 0.5%-1.5% dilute sulfuric acid solution for 5-15 minutes, centrifugal separation, in which the solid are iron ore concentrate. The invention treats the roe - like phosphorus hematite to obtain the iron ore concentrate with a tenor of 62%, P content less than 0.06%. The invention can fully and reasonably apply rich roe - like phosphorus hematite resource in our country, has a good effect of dephosphorization and a low cost. And produced iron ore concentrate have a high recovery ratio.

Description

technical field [0001] The invention relates to a method for preparing iron concentrate for ironmaking from oolitic hematite, in particular to a method for preparing iron concentrate for ironmaking from oolitic hematite with higher phosphorus content. Background technique [0002] my country's oolitic hematite ore reserves are abundant, but due to the complex intercalation relationship between hematite and quartz, kaolinite and collophosite, it is recognized as one of the most difficult iron ore types. At the same time, the ore belongs to high Phosphate ore, qualified iron ore concentrate that can be directly used for blast furnace ironmaking can not be obtained after sorting. Therefore, oolitic hematite resources are basically not utilized at present. [0003] In recent years, with the rapid development of my country's iron and steel industry, the supply of iron ore has become increasingly tight, and the research on using domestic phosphorus-containing oolitic hematite reso...

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Problems solved by technology

[0003] In recent years, with the rapid development of my country's iron and steel industry, the supply of iron ore has become increasingly tight, and the research on using domestic phosphorus-containing oolitic hematite resources to prepare iron concentrates for ironmaking has been put on the agenda. From the research situation that has been carried out From the point of view, so far, the research work of using phosphorus-containing oolitic hematite ore to prepare iron concentrate for ironmaking mainly includes: reverse flotation process, selective agglomeration-reverse flotation, high gradient magnetic separation, ultra-fine Grinding-selective flocculation (agglomeration)-weak magnetic separation or flotation, fine grinding-gravity separation-magnetic separation, fine grinding-multiple gravity separation, direct reduction method, acid leaching, chlorination roasting-acid leaching process, etc., However, due to the complex intercalation relationship between hematite and quartz, kaolinite and collophosite in oolitic hematite ore, most of these methods have low iron grade and recovery rate of the obtained iron concentrate, high phosphorus content, and technical problems. Long process, high cost, etc. Although some scholars have used Thiobacillus to dephosphorize the obtained iron concentrate, the dephosphorization rate is only about 42%.

It can be said that an effective method for preparing iron concentrates for ironmaking by using oolitic hematite resources that can be used in large-scale industrial applications has not yet been explored.

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