Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite

Abstract

A reductive ore dressing technology for preparing the magnetite concentrate from poor hematitie or poor limonite includes such steps as pulverizing said poor hematite or limonite and carbon contained substance, mixing, cold die pressing to obtain lumps, heating at 280-1200 deg.C for 3-100 min to reduce Fe2O3 to Fe3O4, water cooling, grinding and magnetic separation.

Description

technical field

[0001] The invention relates to a reduction beneficiation method for producing magnetite from anthracite and limonite, which belongs to the technical field of iron and steel smelting. Background technique

[0002] The main raw material for ironmaking blast furnaces is iron ore. According to the national industry standard, the iron content of iron ore should be more than 60% before it can be used as raw material for blast furnace ironmaking, so it is required to beneficiate the iron ore entering the blast furnace. With the rapid development of my country's economy, the demand for iron ore is increasing, but the mining of iron ore can no longer meet the needs of iron-making enterprises. Lean iron ore is mainly hematite or limonite, and its main component is Fe 2 o 3 , large reserves, low price, easy to mine, but because of low iron content, it is difficult to beneficiate and difficult to be used in blast furnace ironmaking.

[0003] At present, the main ben...