Method for producing high-purity magnesium oxide through utilizing low-grade magnesium oxide and magnesite

A magnesium oxide, low-grade technology, applied in the direction of magnesium oxide, etc., can solve problems such as magnesium chloride pollution, achieve the effects of solving environmental pollution, considerable economic and social benefits, and reducing production costs

Inactive Publication Date: 2013-09-04
重庆阁林环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for producing high-purity magnesia by utilizing low-grade magnesia and magnesite. In the method, magnesium salt is added to low-grade magnesia, and after heat treatment, high-purity magnesia is produced. Solved the problem of magnesium chloride pollution produced in the process of producing sponge titanium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Implementation example 1 (production of high-purity MgO ceramics)

[0017] (1) Preparation of raw materials

[0018] The fused magnesium was pulverized and passed through a 100-mesh sieve.

[0019] (2) Mixing and ball milling

[0020] Fused magnesium and a certain proportion of MgF 2 , rosin and alcohol are mixed, the content of magnesium oxide in fused magnesium is 94.0%-97.5% (mass percentage), MgF 2 The addition amount of fused magnesium is 0.1-15.0% (mass percentage).

[0021] After stirring evenly, perform ball milling, and pass the ball-milled slurry through a 200-mesh sieve.

[0022] (3) drying

[0023] The ball-milled slurry is dried to form a slurry block, and the drying temperature is less than 100°C.

[0024] (4) Crushing and spray granulation

[0025] The dried powder is pulverized and passed through a 100-mesh sieve, sprayed and granulated, and then the powder is passed through a 60-mesh and 100-mesh sieve, and the powder in between is taken, ...

Embodiment 2

[0034] Implementation example 2 (production of high-purity MgO ceramics)

[0035] (1) Preparation of raw materials

[0036] The fused magnesium was pulverized and passed through a 100-mesh sieve.

[0037] (2) Mixing and ball milling

[0038] Mix fused magnesia with a certain proportion of magnesium chloride, rosin and alcohol produced in the process of producing sponge titanium. The content of magnesium oxide in fused magnesia is 94.0%-97.5% (mass percentage), and the content of magnesium oxide produced in the process of producing sponge titanium The added amount of magnesium chloride is 0.1-15.0% (mass percentage) of the fused magnesium.

[0039] After stirring evenly, perform ball milling, and pass the ball-milled slurry through a 200-mesh sieve.

[0040] (3) drying

[0041] The ball-milled slurry is dried to form a slurry block, and the drying temperature is less than 100°C.

[0042] (4) Crushing and spray granulation

[0043] The dried powder is pulverized and...

Embodiment 3

[0052] Implementation example 3 (production of high-purity MgO sand, powder)

[0053] (1) Preparation of raw materials

[0054] The fused magnesia is pulverized and passed through a 100-mesh sieve, and the content of magnesium oxide in the fused magnesia is 94.0%-97.5% (mass percentage).

[0055] (2) Mixing and ball milling

[0056] Fused magnesium and a certain proportion of MgF 2 For mixing, MgF 2 The addition amount of fused magnesium is 0.1-15.0% (mass percentage).

[0057] After stirring, ball milling was performed.

[0058] (3) Carry out calcination and heat preservation treatment at 300-1600°C, so that impurities such as Fe, Si and Ti in fused magnesium can be mixed with MgF 2 Fully react and evaporate.

[0059] (4) Cooling and crushing

[0060]After one hour of heat preservation, the high-purity magnesium oxide is cooled and then crushed and classified. The content of the prepared magnesium oxide is 98.0-99.5%.

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PUM

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Abstract

The invention relates to a method for producing pure magnesium oxide, and concretely relates to a method for producing high-purity magnesium oxide through utilizing low-grade magnesium oxide and magnesite. The method comprises the following steps: adding a magnesium salt to low-grade magnesia having a magnesium oxide mass percentage content of 94.0-97.5% or magnesite having a magnesium oxide mass percentage content of 40.0-46.0%, uniformly mixing, and carrying out heating calcining to prepare high-purity magnesium oxide having a purity of above 98.0%. High-purity magnesium oxide is produced through the addition of the magnesium salt to the low-grade magnesium oxide and the heating treatment in the invention. The method solves a magnesium chloride-polluted environment problem generated in the sponge titanium production process, reduces the production cost, and brings considerable economic and social benefits.

Description

technical field [0001] The invention relates to a method for producing pure magnesium oxide, in particular to a method for producing high-purity magnesium oxide by utilizing low-grade magnesium oxide and magnesite. Background technique [0002] The purity of magnesium oxide is an important factor affecting its performance. When the purity of magnesium oxide is greater than 98%, it has high thermal conductivity, low dielectric loss, and corrosion resistance. At present, the magnesium oxide produced in China is mainly light-burned magnesium oxide with a purity of less than 96%. my country's annual demand for high-purity magnesium oxide is more than 100,000 tons, but only about 10,000 tons of high-purity magnesium oxide can be produced each year, and the gap mainly depends on imported products to supplement. High-grade fused magnesia products are mainly used in IP industry, aerospace and military industries, etc., and the supply exceeds demand at present; low-grade magnesia p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C01F5/02
Inventor 曹大力陈军修李维黄善添孔德玉王晶姜康佳
Owner 重庆阁林环保科技有限公司
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