A sorting process of fine-grained red magnetic mixed iron ore

Abstract

The invention relates to a micro-fine particle red magnetic mixed iron ore sorting process characterized by including stage grinding-classification-weak magnetic operation-strong magnetic operation-anionic reverse flotation operation, the anionic reverse flotation is performed by use of a one-coarse, one-fine and large circulation mine returning three-scavenging system. According to the micro-fine particle red magnetic mixed iron ore sorting process, first stage ball-milling is performed, then weak magnetic-strong magnetic separation is performed, excess-grinding is effectively prevented, the effect of the magnetic separation can be ensured; after secondary stage ball-milling, anionic reverse flotation operation is directly performed, the advantage of good micro-fine particle iron ore sorting effect of reverse flotation is full used, by use of the technological process, iron concentrate with the iron grade of 65% and the iron recovery rate of more than 73% can be obtained, the final sorting indicators can be further optimized, and the high recovery rate of the iron concentrate can be ensured.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a fine-grain red-magnetic mixed iron ore separation process. Background technique [0002] The Yuanjiacun Iron Mine in Shanxi, my country is a large-scale sedimentary metamorphic iron deposit with a reserve of about 1.262 billion tons. Yuanjiacun iron ore reserves are large, and the development and utilization of this mine will play a positive role in the iron ore supply of Taiyuan Iron and Steel Group and even the whole of China. The mine was discovered in the 1960s. Since it is mainly oxidized ore such as hematite and has a wide variety of ores, the types of iron minerals include quartz-type primary ore, quartz-type oxidized ore, quartz-type specularite, and quartz-type specularite. Sub-lean ore, quartz-type (magnetic) hematite, amphibole-type oxide ore, and conglomerate-type iron ore are available in seven types; the useful minerals are embedded with fine parti...

AI Technical Summary

Problems solved by technology

Through the experimental research on the fine-grained hematite ore in Yuanjiacun, Taiyuan Iron and Steel Co., Ltd., the fine particle size of iron minerals is P80=25-30 microns. It is found that if the conventional hematite reverse flotation small circulation process is adopted, the flotation process will be For one roughing, one beneficiation, four-five times of sweeping, not only the flotation time must reach 134 minutes, but also four-five times of sweeping flotation must be used to make the grade of iron concentrate reach 65%, and the operating recovery rate It can only reach 77%. The flotation time of this process is too long, the recovery rate is low, many flotation machines are used, the investment is high, the operation cost is high, and the cost is high

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