Iron ore mixed ore beneficiation process

Abstract

The invention discloses an iron ore mixed ore dressing process, which is based on magnetite and hematite mixed ore with the ore dressing scale of 4800000 t annual treatment capacity and the raw ore grade of 33.5%, the magnetic iron occupancy of 18% and the silicon content of 32.5%, first-stage weak magnetic concentrate and first-stage strong magnetic concentrate are ground and separated according to different disseminated particle size characteristics of the magnetite and the hematite minerals, and the first-stage weak magnetic concentrate and the first-stage strong magnetic concentrate are separated and separated according to the disseminated particle size characteristics of the magnetite and the hematite minerals. According to different ore monomer dissociation granularities, separate grinding and separation are achieved, the comprehensive fineness content of three-section ore grinding is increased to 86% from 80%, the grade of three-section weak magnetic concentrate is increased to 67% or above from 65%, it can be guaranteed that the iron ore concentrate recovery rate is 70.50% and the iron ore concentrate silicon content is smaller than 6.6% while it is guaranteed that the comprehensive iron ore concentrate grade in the whole process is 63.80%, and on the premise that the cost is not increased, the iron ore concentrate recovery rate is greatly increased. 0.54 million t of iron ore concentrate with the grade of 63.80% or above can be increased every year; after separate grinding and separation are carried out, the volume of ore pulp entering the vertical mill is reduced, the ore grinding circulation load of the vertical mill is reduced to 350% from 460%, one of five vertical mills can be stopped and started, and the electric quantity per hour is saved by 1190 kW.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal beneficiation, in particular to an iron ore mixed ore beneficiation process. Background technique [0002] The iron ore mixed ore is a mixture of magnetite and hematite. The ore is generally selected by stage grinding, stage separation, and magnetic gravity combination process. After semi-autogenous grinding and ball milling, the raw ore is sorted by a weak magnetic machine to obtain a weak magnetic concentrate, which is magnetite; a weak magnetic tailings is sorted by a strong magnetic machine to obtain a Strong magnetic concentrate, one section of strong magnetic concentrate is hematite, because the above process is to feed a section of weak magnetic and strong magnetic mixed concentrate into the vertical mill to form a magnetic and red mixed mill. The mixed grinding process of magnetic and red coarse concentrate, the product particle size distribution is unreasonable, the grinding fi...

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Problems solved by technology

The mixed grinding process of magnetic and red coarse concentrate, the product particle size distribution is unreasonable, the grinding fineness of magnetite is 86% (-325 mesh), and the grinding fineness of hematite is 75% (-325 mesh), which cannot reach iron Concentrate quality improvement and silicon reduction requirements; at the same time, due to the large volume of ore pulp, the vertical mill equipment cycle load is large, the grinding efficiency is low, and the strong magnetic minerals in the second-stage weak magnetic tailings enter the subsequent hematite separation process, resulting in magnetic The Phenomenon of Iron Ore Occupying the Sorting Space of Hematite

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