Micro-fine particle magnet fine powder upgrading recleaning process

Abstract

The invention relates to a micro-fine particle magnet fine powder upgrading recleaning process. The process is characterized by comprising an iron ore concentrate I grading process and a comprehensive iron ore concentrate II grinding process. The iron ore concentrate I grading process comprises the following steps: firstly, feeding magnet fine powder into a full-automatic magnetic levitation cleaner which is internally provided with a forward / reverse dual-direction magnetic field, so that the magnet fine powder is in levitation state in ore pulp; and releasing gangue in a magnetic flux linkage to directly obtain iron ore concentrate I with grade not less than 68% and recovery rate being 90%. The iron ore concentrate II grinding process comprises the steps of concentration magnetic separation on middlings, vertical mill-cyclone closed path processing, two-stage low intensity magnetic separation on middlings and strong intensity magnetic separation on tailings so as to obtain iron ore concentrate II with grade ranging from 55% to 57% and recovery rate ranging from 8% to 8.5%; the tailings processed by the concentrate concentration magnetic separation, middling concentration magnetic separation and two-stage low intensity magnetic separation can be subjected to recleaning so as to recycle partial iron ore concentrate II from the tailings. By virtue of the process disclosed by the invention, energy is saved, the consumption is reduced, the recovery rate is improved, the tailing grade is lowered, the metal loss is reduced, social and environmental benefits are improved, and the sustainable development of enterprises and society is promoted.

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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