A New Method of Reverse Flotation Separation, Grinding and Separation

Abstract

The invention relates to the technical field of beneficiation of lean hematite, in particular to a new method for flotation, regrinding and re-election, which includes one-stage roughing, one-stage beneficiation, and three-stage sweeping operations, and the concentrate of one-stage roughing operation is fed into The tailings of one stage of selection operation and one stage of roughing operation are fed into one stage of sweeping operation, and the fine tailings of one stage of selected middle ore return to one stage of roughing operation, the concentrate of one stage of concentration operation is flotation concentrate, and the tailings are fed The second-stage sweeping operation, the second-stage sweeping concentrate is returned to the first-stage sweeping operation, the tailings are fed into the third-stage sweeping operation, the third-stage sweeping concentrate is returned to the second-stage sweeping operation, and the first-stage sweeping operation The concentrate is re-grinded to greatly increase the monomer dissociation degree of the concentrate in the first stage of scavenging operation, and the re-grinded product returns to the original flotation process for further separation. Minerals are more fully sorted, which reduces the amount of medium ore circulation in each operation of flotation, and makes the flotation circuit form a virtuous circle. The grade of flotation concentrate is improved, the grade of flotation tailings is reduced, and the metal recovery rate is improved.

Description

technical field [0001] The invention relates to the technical field of beneficiation of lean hematite, in particular to a new method of reverse flotation beneficiation, regrinding and beneficiation. Background technique [0002] In the existing Anshan-type lean hematite production process, the fine-grained products are usually processed by the method of "weak magnetic field - strong magnetic field - anion reverse flotation". In the sweeping operation, the concentrate of the roughing operation is fed into the beneficiation operation, and the tailings of the roughing operation are fed into a stage of sweeping operation. The concentrated ore tailings of the first stage of selection are returned to the roughing operation, and the concentrate of the beneficiation operation is flotation concentrate; operation; the second-stage scavenging concentrate (middling 2) returns to the first-stage scavenging operation, and the tailings are fed into the third-stage scavenging operation; th...

AI Technical Summary

Problems solved by technology

There are only two export products of the flotation operation, one flotation concentrate and one flotation tailings. The middle ore of each operation is returned to the previous operation. Low, entering the concentrate will reduce the quality of the concentrate, entering the tailings will increase the grade of the tailings, this part of the middle ore can only be continuously circulated in the process, when the accumulation reaches a certain amount, it must run out of the process, so Whether it enters the concentrate or enters the tailings, it will have an impact on production indicators

In the reverse flotation operation, the fine tailings, first-sweep fines, second-sweep fines, and third-sweep fines are all medium ores in flotation operations. Most of these minerals are contiguous bodies, which can neither enter the tailings nor the concentrate , repeatedly circulated in the process, and the middle ore has accumulated to a certain extent, it must be excluded from the process. In this way, no matter whether this part of the middle ore enters the concentrate or tailings, it will affect the product quality and production indicators. Among the medium ores, Yisaojing has a higher yield and higher grade, which has a greater impact on the separation effect of subsequent operations

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