Magnesite-Purification Method
The purpose of magnesite ore dressing is to remove its harmful impurities and improve the grade of ore, mainly to solve the problem of separation of silicate gangue minerals and magnesite.
The magnesite ore dressing began in the early period of the Second World War, when it was dominated by hand. Since then, heavy medium beneficiation, flotation, hot selection and other methods have come out.
The first one is flotation method, which is one of the main purification methods for treating magnesite. For gangue minerals, silicate minerals such as talc and quartz, flotation is usually carried out under the natural ph of the slurry. Cationic collectors and foaming agents can achieve good results, increasing the purity of magnesite to 95%-97%.
The second type is light burning: magnesite is calcined at a temperature of 750-1100 ° C to be lightly burned; and its product is called light burned magnesium powder. Since the reduction of magnesite is generally about 50%, the mgo content in the ore can be almost doubled by light burning. In this sense, light burning is the most effective means of mgo enrichment. In addition, light burning is also a preliminary job for hot selection of magnesite and some re-election. Light burnt magnesium has high activity and is an ideal raw material for the production of high-density magnesia.
The third type is the thermal selection method: the difference in thermal properties between magnesite and talc is caused by the difference in density and hardness between the two after calcination, and then the minerals are selectively crushed and simply sieved or classified. Get separated. The hot selection is to calcine magnesite at 800 ° C ~ 1000 ° C to form a porous, light body, low pressure strength particles. The strength of talc and chlorite containing silicate minerals is gradually increased, and the strength of dolomite is 30 to 33 times higher than that of magnesite after calcination. Using this difference, the calcined magnesite is crushed, sieved, and classified to enrich the magnesite into the fine particle grade.
The fourth is the re-election method. The re-election is mainly a method of sorting using the difference between magnesite and impurity mineral density. Mainly using jigging, shaker and heavy medium. Since the specific gravity of magnesite and gangue minerals are not much different, the effect of directly treating the magnesite by re-election is very poor. 5g /cm-1. 4g /cm。 After the magnesite is calcined for 30 minutes, the magnesite density can be reduced from 2. 7g / cm ~ 2. 8g / cm to 1. 3g / cm ~ 1. 4g / cm. The magnesite ore dressing part of the United States adopts a method of heavy medium dressing.
The fifth is chemical beneficiation. Chemical beneficiation is used to treat magnesites where the impurities are finely impregnated or present in phase in phase. Usually, the ore or calcined ore is leached with a leaching agent, and the impurity precipitate is separated by a different method. According to the difference of the leachate, the chemical method is further divided into a hydrochloric acid method, a hydrogencarbonate method, an ammonium method, and the like. The chemical method is also known as the leaching method.
In addition, there are radiation sorting methods, magnetic separation, electro-selection, biological microbial leaching, etc., which are rarely used.
The determination of the magnesite ore dressing method is closely related to the metallogenic reasons and forms, impurity components, etc., and is related to the quality requirements of the concentrate. Therefore, detailed mineralogical analysis and beneficiation tests are required, and the best test methods and procedures are selected based on the test data. Therefore, the most suitable beneficiation method should be selected according to the specific cause and occurrence state of magnesite.
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