Low-grade magnesite selective dissociation equipment and method

A magnesite, low-grade technology, applied in grain processing and other directions, can solve the problems of high magnesite recovery rate, low recovery rate, poor selectivity, etc., and achieve the effect of improving comprehensive utilization rate

Inactive Publication Date: 2014-12-10
营口东吉科技(集团)有限公司
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  • Claims
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Problems solved by technology

[0005] The object of the present invention is to, for above-mentioned existing magnesite purification method poor selectivity, the problem of low recovery rate, propose a kind of low-grade magnesite selective dissociation method, the magnesite that adopts this method to process is good in selectivity, High recovery rate

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  • Low-grade magnesite selective dissociation equipment and method

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Embodiment 1

[0024] This embodiment selects the low-grade magnesite in the Dashiqiao area. In the low-grade magnesite, the mass content of MgO is 40%, the mass content of calcium oxide is 2.3%, the mass content of silicon dioxide is 4%, and the mass content of iron oxide is 4%. The content is 0.8%. The low-grade magnesite selective dissociation method is as follows figure 1 shown, including the following steps:

[0025] (1) Put the low-grade magnesite in the pulverizing equipment, and pulverize it to a particle size of 3-5 mm. The pulverizing equipment used includes a roller crusher and a vibrating screen group.

[0026] (2), the low-grade magnesite obtained by pulverizing in the step (1) is placed in a magnetic separator for magnetic separation, and the magnetic field intensity used in the magnetic separation is 3.2T; after the magnetic separation, the magnesite in the magnesite (ore concentrate) The content of silicon dioxide is reduced to less than 1.5%, the content of iron oxide is r...

Embodiment 2

[0031] The mass content of MgO in the low-grade magnesite treated in this embodiment is 41%, the mass content of calcium oxide is 3%, the mass content of silicon dioxide is 3.2%, and the mass content of iron oxide is 0.7%. The low-grade magnesite selective dissociation method comprises the following steps:

[0032] (1) Put the low-grade magnesite in the crushing equipment, and crush it until the particle size is 5-8mm.

[0033] (2), the low-grade magnesite obtained by pulverizing in step (1) is placed in a magnetic separator for magnetic separation, and the magnetic field intensity used in the magnetic separation is 5T; after magnetic separation, the magnesite (ore concentrate) The content of silicon dioxide is reduced to below 1.8%, the content of iron oxide is reduced to below 0.3%, and the content of calcium oxide is reduced to below 1.6%.

[0034] (3), the magnesite obtained in step (2) is placed in a grinding device for grinding, so that the magnesite, calcite, quartz, a...

Embodiment 3

[0038] The mass content of MgO in the low-grade magnesite treated in this embodiment is 41%, the mass content of calcium oxide is 2.0%, the mass content of silicon dioxide is 5%, and the mass content of iron oxide is 0.5%. The low-grade magnesite selective dissociation method comprises the following steps:

[0039] (1) Put the low-grade magnesite in the crushing equipment, and crush it until the particle size is 5-8mm.

[0040] (2), the low-grade magnesite obtained by pulverizing in step (1) is placed in a magnetic separator for magnetic separation, and the magnetic field intensity used in the magnetic separation is 2.5T; after magnetic separation, the magnesite (ore concentrate) The content of silicon dioxide in magnesite is reduced to less than 2.0%, the content of iron oxide is reduced to less than 0.2%, and the content of calcium oxide is reduced to less than 1.3%. Magnetic separation greatly reduces the content of iron oxide in magnesite. The content of iron oxide direct...

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Abstract

The invention provides a low-grade magnesite selective dissociation method. The method comprises the following steps: (1) crushing the low-grade magnesite to be particles with size of 1-10mm; (2) placing the magnesite crushed in the step (1) in a magnetic separator for magnetic separation under the magnetic field intensity of 2-5T; (3) grinding the magnesite obtained in the step (2) into powder with size less than 200 meshes and the mass content more than 60%, sieving by a 200-mesh screen, thus obtaining screen underflows; (4) calcining the magnesite obtained in the step (3) at 600-900 DEG C for 40-180min to obtain light roasting powder; and (5) grinding the light roasting powder obtained in the step (4) into powder with size less than 200 meshes and the mass content of more than 97%, sieving by a 200-mesh screen, thus obtaining screen underflows which are high-grade magnesite concentrate. The low-grade magnesite selective dissociation method has scientific and reasonable steps, and solves the problems that the magnesium oxide recovery rate is low and environment pollution is caused easily in the prior art.

Description

technical field [0001] The invention relates to magnesite smelting technology, in particular to a method for selective dissociation of low-grade magnesite. Background technique [0002] China is one of the countries with relatively rich magnesite resources in the world, and the distribution is relatively concentrated. Among them, Liaoning Province has rich magnesite reserves, accounting for 85% of the national total, ranking first in the country. my country's magnesite industry has developed into a unique resource-based industry with an annual output of 15 million tons of magnesia and its products, ranking first in the world. [0003] Among the magnesite resources owned by my country, low-grade magnesite accounts for nearly half of the total reserves. Due to the lack of scientific basis and high randomness in mining, the phenomenon of mining the rich and abandoning the poor, and random mining and indiscriminate mining are very serious. As a result, the ore recovery rate of...

Claims

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Application Information

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IPC IPC(8): B02C21/00
Inventor 崔俊峰崔军么革齐国超崔毅崔薇薇何占高刘希洋
Owner 营口东吉科技(集团)有限公司
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