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Purification method for low-grade magnesite via hydration

A purification method and magnesite technology, which is applied in the field of hydration purification of low-grade magnesite, can solve the problems of complex flotation and chemical purification process, low purity of thermal separation process products, high production cost, etc., and achieve process parameters Easy to control, low cost and simple process

Inactive Publication Date: 2013-07-17
NORTHEASTERN UNIV
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AI Technical Summary

Problems solved by technology

[0005] The invention provides a new method for hydration purification of low-grade magnesite, which overcomes the shortcomings and shortcomings of complex flotation and chemical purification processes, high production costs, and low purity of thermal separation process products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Put magnesite nuggets and ore particles with a magnesium oxide content of 43% into a rotary kiln, keep it warm at 650°C for 3 hours, take it out after cooling, put it into water with 150% of the water required for theoretical hydration, and hydrate at room temperature for 24 hours , the hydrated magnesium hydroxide powder was dried in the air, self-grinded, sieved, and then calcined for 2 hours at 800 ° C for a second time, and the purity of the obtained magnesium oxide reached 97.9%.

Embodiment 2

[0012] Put magnesite nuggets and slag powder with a magnesium oxide content of 41% into a tunnel kiln, keep it warm at 680°C for 2 hours, take it out after cooling, put it into water with 300% of the water required for theoretical hydration, and put it in water at 50°C After 12 hours, the hydrated magnesium hydroxide powder was taken out, self-ground, sieved, and then calcined at 800°C for 2 hours, and the purity of the obtained magnesium oxide reached 97.6%.

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Abstract

A purification method for low-grade magnesite via hydration, comprising: by using the low-grade magnesite as a raw material, calcining at 600-1000 DEG C to fully decompose the magnesite, and adding water to hydrate magnesium oxide obtained after the calcination; autogenous grinding and sieving magnesium hydroxide obtained by hydration, and by employing the characteristics of magnesium hydroxide obtained by hydration being the easily pulverized and easily separated from other mineral impurities, removing impurities with relatively high hardness such as calcium oxide, silica, alumina and iron oxide therein; and secondary calcining the magnesium hydroxide at 600-900DEG C to obtain the magnesium oxide with a purity higher than 97.5%. By adopting the method of the present invention, the low-grade magnesite can be effectively and fully used.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a method for hydration purification of low-grade magnesite. Background technique [0002] my country's magnesite resources are abundant and widely distributed. The current total proven reserves are about 3.402 billion tons, ranking first in the world. However, in recent years, due to the limitation of production cost and mineral processing technology level, my country's manufacturers often only mine high-quality ore, and the ore powder and low-grade ore produced in the mining process are often piled up as waste rock, resulting in resources. huge waste and environmental pollution. And with the increase of mining volume, super-grade magnesite has shown a gradual depletion trend. Therefore, how to efficiently utilize low-grade magnesite and improve the utilization rate of magnesite resources has become one of the important issues in the magnesite material industry. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
Inventor 于景坤袁磊张令刘蕊曾璐
Owner NORTHEASTERN UNIV
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