A process for upgrading and re-selecting microfine magnetic fine powder

Abstract

The invention relates to a fine-grained magnetite concentrate powder upgrading and re-separation process, which is characterized in that it includes the iron concentrate I separation process and the comprehensive iron concentrate II grinding process, first fed into a fully automatic magnetic levitation concentrator, and the fully automatic The magnetic levitation concentrator has a built-in positive and negative two-way magnetic field, which can make the magnet powder in a suspended state in the pulp, release the gangue mixed in the magnetic chain, and directly obtain iron concentrate with a grade of ≥68% and a recovery rate of up to 90%. Mine I; the iron concentrate II grinding and separation process is composed of medium ore concentrated magnetic separation, vertical mill-cyclone closed circuit, two-stage weak magnetic separation of medium ore, and strong magnetic separation of tailings, which can obtain a grade of 55% Iron concentrate II with a recovery rate of -57% and a recovery rate of 8%-8.5%, uses a strong magnetic machine to re-select the tailings of concentrate concentrated magnetic separation, medium ore concentrated magnetic separation and two-stage weak magnetic separation. Part of the iron concentrate II is recycled in the mine, which saves energy and reduces consumption, improves recovery rate, reduces tailings grade, reduces metal loss, improves social and environmental benefits, and promotes sustainable development of enterprises and society.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a process for upgrading and re-separating microfine magnetic powder. Background technique [0002] At present, in some magnetite ore concentrators, the iron minerals are too finely distributed, and it is difficult to obtain high-grade and high-recovery iron concentrates through the traditional ball milling-weak magnetic separation process. At present, the products of many ore concentrators are used for pelletizing Raw materials, the iron ore concentrate grade required by the general pelletizing plant should be above 68%, but currently many concentrators produce iron ore concentrate powder with a grade between 62% and 65% due to the backward technology level, which requires us to Further improve the quality of the iron ore concentrate powder in the concentrator, and improve the grade to meet the needs of the pelletizing plant. At present, most iron concentrate powd...

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Problems solved by technology

[0002] At present, in some magnetite ore concentrators, the iron minerals are too finely distributed, and it is difficult to obtain high-grade and high-recovery iron concentrates through the traditional ball milling-weak magnetic separation process. At present, the products of many ore concentrators are used for pelletizing Raw materials, the iron ore concentrate grade required by the general pelletizing plant should be above 68%, but currently many concentrators produce iron ore concentrate powder with a grade between 62% and 65% due to the backward technology level, which requires us to Further upgrade the iron ore concentrate powder in the concentrator to improve the grade to meet the needs of the pellet plant

At present, most iron concentrate powders are upgraded by flotation process. The flotation process relies on the adsorption of foam for further separation. The effect of iron concentrate powder on quality improvement and impurity reduction is limited. In general hematite flotation, the grade of iron concentrate can reach 62 %-65%, the iron concentrate grade of magnetite flotation can reach 65%-67%, so it is very difficult to achieve the grade of iron concentrate above 68% by flotation process

Moreover, this process requires multi-stage flotation operations, the process is complicated, the operation is cumbersome, the investment in equipment and infrastructure is high, and various chemical agents are used in flotation. The preparation of the agents is not only not conducive to environmental protection but also increases the cost of preparation of the agents. The use of reverse flotation not only requires the use of various chemicals, but also needs to heat the pulp, which not only increases the cost, but also the high temperature operation is harmful to the health of employees

In addition, due to the high grade of iron powder fed in, generally the grade of flotation tailings is higher, and the loss rate of magnetic iron is higher

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