Magnetite concentrate quality-improving and impurity-reducing technology and device

Abstract

The invention discloses a magnetite concentrate quality-improving and impurity-reducing technology and device. The technology comprises the following specific steps that firstly, a vertical spiral stirring ore grinding machine is used for carrying out wet grinding on coarse concentrate particles with the grade lower than or equal to 60%, and primary ore pulp is obtained after grinding is carried out for a period of time; secondly, the primary ore pulp is discharged into an ore pulp pool and pumped into a hydrocyclone through a slurry pump, the primary ore pulp is classified through the hydrocyclone, the classified settled sand (at a coarse fraction) is subjected to the second step again, and secondary ore pulp (at a fine fraction) overflows; thirdly, the secondary ore pulp enters a cylindrical magnetic extractor, and iron ore concentrate with the iron-containing grade higher than 63.5% is obtained. According to the magnetite concentrate quality-improving and impurity reducing technology, the steps are orderly linked, the existing low-grade coarse concentrate is ground, subjected to closed-loop classification and magnetic sorting, the iron-containing grade of the magnetite concentrate is increased to 63.5% or above from 60% or lower, and the content of silicon and aluminum impurities is effectively reduced.

Description

Technical field [0001] The invention belongs to the technical field of beneficiation (mineral separation) technology, and particularly relates to a process and device for improving the quality of magnetite concentrate and reducing impurities. Background technique [0002] One of the company’s concentrators originally designed a production scale of 1 million tons per year. It was originally designed to process high-grade magnetite crystals with coarse grained grain size. The design process is two stages of coarse crushing-self-milling and ball milling. Process flow. Due to some objective reasons, the concentrator turned to processing mixed ores with low-grade, fine-grained magnetite crystals. The self-grinding machine of this process system has poor adaptability to ores with different hardness and grindability, resulting in the system The raw ore processing capacity is on a downward trend. The iron content of the produced magnetite concentrate has dropped from more than 64% to le...

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Problems solved by technology

The existing problems are that the flotation process is complicated, the flotation reagents consume a lot, the cost is high, the operation is cumbersome, the equipment and infrastructure investment are high, and the flotation needs to use various reagents, which not only pollutes the environment, but also prepares reagents, which increases the Cost of beneficiation, chemicals damage the body of operators

However, when dealing with materials containing more than 80% of 0.074mm, the screening efficiency of high-frequency fine sieve is very low, generally lower than 30%, which is much lower than the classification efficiency of hydrocyclone

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