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Ore dressing process of treating poor hematite

A technology of iron ore and process, which is applied in the field of beneficiation process for processing lean hematite ore, and can solve the problems that the concentrate grade has not achieved breakthrough progress and affects the development of beneficiation technology

Inactive Publication Date: 2004-11-24
鞍钢集团矿业公司研究所
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Problems solved by technology

However, with the passage of time, although fine-grained lean hematite has been tackled by several generations of domestic and foreign ore dressing circles, its concentrate grade has not yet achieved breakthrough progress. Some high-cost hematite beneficiation plants in countries such as the United States and Canada were forced to close or stop production, which affected the development of beneficiation technology

Method used

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Embodiment Construction

[0009] The present invention is mainly composed of stage grinding, coarse and fine separation, coarse gravity separation, middle ore regrinding and re-separation (referred to as coarse-grade mineral processing process) and fine-grained strong magnetic-reverse flotation (referred to as fine-grade mineral processing process).

[0010] The coarse-grained process produces two final products, heavy fines and sweeping magnetic tails, namely heavy tails, and produces an intermediate product, medium ore, for regrinding and re-election.

[0011] After the fine-grained process materials are subjected to weak magnetic and strong magnetic operations, they enter the reverse flotation operation, and after adding chemicals to adjust the pulp, they are separated by the first coarse, the first fine, and the third sweep to obtain the final concentrate product floating concentrate and the final tailings product Floating tail, and the intermediate product (medium ore) produced by it is returned to...

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Abstract

The ore dressing process of treating poor hematite includes staged ore milling, size separating, gravitational dressing, strong magnetic dressing and inverse floating. By means of staged ore milling, early separation between iron containing mineral and gangue, returning the intergrowth to next ore milling for further separation, separating milled material based on size, gravitational dressing of coarse grains, strong magnetic dressing and inverse floating of fine grains, the raw ore of 30 % grade is enriched into high grade concentrated ore up to 67 % in the metal recovering rate over 76 % and SiO2 content lowered from 8-10 % to below 4.5 %.

Description

technical field [0001] The invention relates to the field of iron ore separation, in particular to an ore separation process for processing lean hematite ore. Background technique [0002] As we all know, in the existing beneficiation technology, the separation of fine-grained hematite quartzite (raw ore contains about 30% iron) usually adopts continuous grinding alkaline positive flotation method, lump ore roasting magnetic separation method, weak magnetic gravity The selection method, etc., the grade of iron ore concentrate produced by ore dressing generally only reaches about 55% to 65%. In 1975, the world's first US Tilden concentrator, which used the flocculation-desliming-cation reverse flotation process to process fine-grained hematite quartzite, was put into operation. %, the recovery rate of 70% has attracted the attention of various countries. However, because the grinding particle size is -500 mesh, reaching 80% to 85%, the particle size of the concentrate is to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B5/52B03B7/00B03D1/00
Inventor 陈平吕建华李维兵周惠文白晓鸣王陆新刘动宋均利苏兴强张宏艺
Owner 鞍钢集团矿业公司研究所
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