Method for improving recovery of hematite and limonite

Abstract

The invention relates the method for Improving the red hematite and brown hematite recovery ratio. The method of solving low recovery ratio of red hematite and brown hematite comprises the following steps: treating the non-magnetic iron ore to magnetic ore, and then dressing ore with magnetic method. The invention method comprises the following step: disintegrating the ore with crusher, high-temperature roasting, making it form magnetic ore, adding water, and then dressing ore with magnetic method. The method has the advantages of simple operation, high Fe2O3 ore recovery ratio and great economic benefit.

Description

1. Technical field [0001] The invention relates to a method for recovering ore, in particular to a method for improving the recovery rate of hematite limonite. 2. Background technology [0002] Iron ore is the main raw material for ironmaking, and its grade directly affects the output and quality of iron smelting. Iron ore has non-magnetic and magnetic types. Iron ore and limonite, due to their weak magnetic properties, can only be beneficiated by gravity separation, and the recovery rate of gravity beneficiation is low, generally less than 70% (recovery rate <70%), a large amount of Fe 2 o 3 Into the tailings are discarded, the grade of iron in the tailings can reach 20-30%, containing Fe 2 o 3 So many useful tailings are abandoned, which is a great loss of resources and a serious waste, which is very unfavorable to the production and development of the metallurgical industry of iron smelting. It not only increases the cost of iron smelting, but also causes unnecessar...

AI Technical Summary

Problems solved by technology

[0003] For above-mentioned situation and fully exploiting and utilizing magnetic weak hematite, limonite, the purpose of the present invention provides a kind of production method that improves hematite, limonite recovery rate exactly, can effectively solve hematite, limonite The problem of low ore recovery rate, the technical solution for it is to convert non-magnetic iron ore (Fe 2 o 3 ) processed into magnetite ore (Fe 3 o 4 ), and then use magnetic separation for mineral processing, because the recovery rate of magnetic separation is higher than that of gravity separation. It is an advanced mineral processing method, but it can only be used for magnetic ore, not for non-magnetic ore. Here, the method of the present invention is that firstly, the ore is coarsely pulverized into blocks with a pulverizer, and then pulverized into coarse powder, and after high-temperature roasting, it becomes magnetic ore, which is ground into powder by adding water, and then beneficiated by magnetic separation. The method is simple, easy to operate and produce, Fe 2 o 3 The ore recovery rate is high, up to 95%, which is a creative breakthrough in the beneficiation of the existing non-magnetic ore hematite limonite, with huge economic benefits