New mineral separation method suitable for separation of hard-separation micro-fine particle magnetic iron ores

Abstract

The invention discloses a new mineral separation method suitable for separation of hard-separation micro-fine particle magnetic iron ores. The new mineral separation method adopts a process comprising the steps of carrying out two-stage grinding on raw ores, carrying out low-intensity magnetic separation, obtaining ore concentrate through reverse flotation and single-stage roughing, regrinding middlings, carrying out the low-intensity magnetic separation and carrying out the reverse flotation; two-stage low-intensity magnetic separation ore concentrate is obtained through the process by adopting a method comprising the steps of stage grinding and stage low-intensity magnetic separation tailings discarding; qualified iron ore concentrate can be obtained in advance by carrying out a cationic collector reverse flotation technology on the two-stage low-intensity magnetic separation ore concentrate under the situation that the granularity is roughened; a regrinding and low-intensity magnetic separation technology is carried out on reverse flotation middlings, the cationic collector reverse flotation technology is carried out on three-stage low-intensity magnetic separation ore concentrate, and thus the iron concentrate grade is increased. According to the new mineral separation method disclosed by the invention, ore concentrate is obtained in advance as the reverse flotation is carried out by independently adopting a cationic collector under the situation that a depressor DF is not added, adding points of medicament are reduced, the manual operation difficulty is reduced, and the cost of mineral separation medicament is reduced; since the ore concentrate is obtained in advance through the reverse flotation, three-stage ball milling material amount is reduced, the ore grinding cost is greatly reduced, and the effect of extracting iron and reducing the energy can be achieved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a mineral processing method for fine-grained magnetite ore, especially suitable for fine-grained magnetite ore that must be ground to -500 mesh (-30 μm) with a particle size content >95% to be dissociated. Energy-efficient sorting. Background technique [0002] Foreign iron ore resources with good mining conditions have been divided up by the three major international mining oligopoly companies and the companies in the country where they are located. How to solve key problems through ore dressing technology as soon as possible to convert foreign refractory iron ore resources mastered by major enterprises in my country into commercial ore is crucial for improving It is very urgent and necessary for my country's iron ore negotiation chips to ensure the raw material supply and sustainable development of my country's major steel companies. At present, most o...

AI Technical Summary

Problems solved by technology

At present, most of the central enterprises in my country, such as CITIC, China Metallurgical, Sinosteel, Anshan Iron and Steel, Wuhan Iron and Steel, etc., have a common problem in the iron ore resources in Western Australia: the ore embedded distribution is fine, and it must be finely ground to more than 500 mesh to be qualified. High concentrate grade, high ore processing cost, and high cost of human resources in this area will pose a huge problem to the future economic benefits of the company. It is also a top priority to solve the beneficiation process and technology of this type of ore

However, the experimental research found that when the above-mentioned technological process is used to treat the refractory fine-grained magnetite ore with a particle size of -500 mesh (-30μm) >95% and a monomer dissociation degree of P80 25μm, the recovery rate of its magnetic iron is less than 90%, resulting in serious waste of resources

Moreover, most of the existing weak magnetic separation-iron ore cationic reverse flotation process adopts cationic reverse flotation to directly throw the tailings, and the loss of iron in the tailings is huge

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