5 purification methods of magnesite!

Magnesite is a kind of magnesium carbonate mineral. Magnesium oxide has strong physical properties such as fire resistance and cohesiveness. Therefore, magnesite is mainly used as raw material for producing refractory materials, and is also used for refining magnesium metal. main ingreadient.

China's magnesite resources are abundant, with proven reserves of about 3.1 billion tons, accounting for a quarter of the world's total reserves, mainly distributed in Liaoning and Shandong provinces. The total reserves account for about 95.11% of the country's total reserves, including Liaoning. The province is mainly concentrated in the southern part of Liaoning, such as Haicheng, Yingkou and other areas. There are 12 proven mining areas with a reserve of 2.577 billion tons, accounting for about 85% of the country's total reserves .

Magnesite is often associated with dolomite, talc, opal, quartz, chlorite, etc. In order to remove its harmful impurities and improve the grade of ore, it must be refined to solve magnesite and silicate gangue minerals, white clouds. Separation of stone.

At present, the industrial purification methods of magnesite mainly include re-election, magnetic separation, roasting, flotation and chemical treatment.

Principle of re-election: It is beneficial to separate and purify the difference in density between magnesite and gangue minerals.

Common equipment or agents: conical resuspension sorting machine, drum re-suspension sorting machine, heavy medium cyclone, ferrosilicon, magnetite, etc.

Features: This method can replace the hand selection to improve the recovery rate of magnesite, but it is only suitable for the treatment of lump ore with lower ore grade and coarser grain size. The United States, Canada, the former Soviet Union, Czechoslovakia, Austria, India, etc. have successively built magnesite heavy medium concentrating plants.

The main use of magnesite is as a refractory material. The iron in the ore will endanger the performance and quality of its refractory products. Therefore, magnesite ore used as a refractory material has strict requirements on its iron impurity content.

The purpose of magnetic separation is to remove iron from the original ore and iron impurities mixed in the process of crushing and grinding, while avoiding the deterioration of the subsequent impurities by the iron impurities.

Roasting principle: using the main impurity talc in high-silicon magnesite ore or the difference in thermal properties between dolomite, chlorite and magnesite, the magnesite is calcined to 800-1000 °C, and the magnesite is decomposed into CO2. The calcined magnesium after decomposition has brittleness, is soft and brittle, and the gangue mineral talc becomes hard with the increase of temperature, and the selective crushing, sieving and air separation are carried out by using the hardness difference and density difference between the two. Thereby the magnesite is separated from other minerals.

Characteristics: Roasting treatment of magnesite has certain limitations, especially for ore with complex mineral composition or high calcium type. Generally, this method is used as pretreatment or pre-enrichment operation for other sorting processes.

Principle of flotation: using the difference in physical and chemical properties of magnesite and gangue minerals for sorting, generally using reverse flotation and positive flotation, that is, first using an amine collector to reverse flotation of siliceous minerals, then The magnesite is being floated with a fatty acid collector.

Flotation purpose: to remove silicate impurities such as talc, quartz, serpentine, and carbonate impurities such as dolomite and calcite.

Commonly used agents: collectors usually use dodecylamine, oleic acid, sodium oleate, oxidized paraffin soap, etheramine, cocoamine, etc. Inhibitors usually use sodium hexametaphosphate, water glass, carboxymethyl cellulose, and the like.

Features: Flotation method is one of the main processes for processing magnesite ore. For example, Dashiqiao, Haicheng, Yingkou and Jixian counties use this method.

Principle of chemical purification: The ore is first calcined to increase its surface activity and solubility, and then leached with hydrochloric acid or nitric acid, sulfuric acid, ammonium salt, hydrogencarbonate, etc., and then according to the difference in the degree of leaching of magnesium and impurities. Different methods are used to precipitate and separate impurities, and finally obtain high-purity MgO products. The basic magnesium carbonate is extracted from magnesite by a chemical treatment method and can be classified into a carbonization method, a hydrochloric acid method, and an ammonium salt method.

Features: Chemical method can be used to purify magnesite ore with fine intercalation and impurities in the same form.

The magnesite purification method is mainly determined by ore genesis, associated mineral composition, etc. Therefore, on the basis of process mineralogy analysis, a large number of beneficiation tests are needed to determine the best beneficiation scheme to ensure the higher grade of concentrate. Recovery rate.

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