Reduction magnetization beneficiation method of lean hematite

Abstract

The invention is a beneficiation method of lean hematite, and especially is physical and chemical combined chemical-industry metallurgical beneficiation technology for reduction magnetization beneficiation of lean hematite with an iron content of not more than 40%. The method adopts peat as a reducing agent, and comprises the following steps: respectively detecting the Fe2O3 content and C contentin lean hematite and peat, calculating the material ratio for the reduction reaction of lean hematite and peat, crushing the reaction materials, well mixing, heating to perform a reduction reaction so as to obtain ferromagnetic compounds of Fe3O4 and FeO, and enriching the lean hematite by a magnetic separator to obtain iron concentrate with a Fe content of not less than 65 wt%. The method of theinvention reduces nonmagnetic hematite with a chemical structure of Fe2O3 into strongly magnetic Fe3O4 and FeO, and thus enriches iron into iron concentrate by magnetic separation; the reducing agentused in the process is cheap, has good reducing effect, can reduce production cost, and greatly improve the recovery rate.

Description

Technical field [0001] The invention is a method for beneficiating lean hematite, especially a chemical metallurgical beneficiation technology that combines chemical and physical selection of lean hematite with iron content ≤ 40% by reduction and magnetization. Background technique [0002] China's iron ore resources are low, with per capita reserves less than 25% of the world average, of which lean ore accounts for 94.3% of the total reserves, and rich ore only accounts for 5.7%. Among the lean ore reserves, magnetite, which is easy to sort, accounts for 68%, and hematite, which is difficult to be enriched by traditional techniques, accounts for 32%. For this type of difficult-to-select hematite, a large number of experimental studies and industrial development have been carried out in terms of mineral size, sorting method, sorting conditions and general reduction magnetization for a long time, but no feasible progress has been made. These methods mainly use coke or CO as a red...

AI Technical Summary

Problems solved by technology

After many years of follow-up research, the inventor has analyzed that there are two reasons for the slow progress of the above method in practical application: one is to make an article only on the external physical status of the mineral, but not to change the internal chemical structure of the mineral to make it Magnetization selection; secondly, in the magnetization work, either the magnetic susceptibility is low, or the technical and economic indicators such as high magnetization cost are poor, and the industrialization requirements cannot be realized