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Method for preparing basic magnesium carbonate and high purity magnesium oxide with trona

A trona and magnesium carbonate technology, applied in the direction of magnesium carbonate, magnesium oxide, etc., can solve the problems of weak alkalinity, low conversion rate of magnesium oxide, harsh operating environment, etc., and achieve low impurity content, low mining cost, and cost reduction Effect

Active Publication Date: 2011-06-01
河南元亨精细化工有限公司
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  • Abstract
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Problems solved by technology

[0032] This method can produce high-purity magnesium oxide, but the alkalinity of ammonia is weak, so that the conversion rate of magnesium oxide is low, and the operating environment is harsh

Method used

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  • Method for preparing basic magnesium carbonate and high purity magnesium oxide with trona
  • Method for preparing basic magnesium carbonate and high purity magnesium oxide with trona

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Effect test

Embodiment

[0049] Weigh 400kg MgCl 2 ·6H 2Add O into the stirring tank, put it into 800L hot water at 60°C, stir fully, then add the magnesium chloride solution into the sand filter, filter the solid particles in it, add it into the 3000L enamel reaction kettle, and heat to 80℃~105℃. The natural lye is decomposed by thermal decomposition at 80-110°C in a thermal decomposition tower, wherein the temperature at the bottom of the tower is 130°C, the temperature at the top of the tower is 100°C, the total alkali of the solution after reaction is above 180g / L, and the content of sodium bicarbonate is 50g / L, into the metering tank, which takes a volume of 1000L, puts it into the reaction kettle, heats the solution, boils, pyrolyzes the magnesium bicarbonate in it to generate magnesium carbonate, keeps the temperature, and the total reaction time is 1 to 2 hours , and then enter the box filter to filter, and then use 40-60 times the amount of solids to wash water at a temperature of 60-80°C f...

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Abstract

The invention belongs to the brine chemical engineering field and in particular to a method for preparing basic magnesium carbonate and high purity magnesium oxide with trona. In the method, magnesium chloride is used as a raw material, the brine of natural alkali is used as precipitation medium, the primary thermolysis of natural alkali is performed, the high temperature reaction of magnesium chloride solution is performed, hot water is used for washing to obtain hydrated basic magnesium carbonate of which magnesium chloride content is more than 42%, and the obtained solid intermediate product is calcined at high temperature to prepare high purity magnesium oxide of which purity is more than 98%. In the method in the invention, the advantages of the brine of natural alkali, namely low cost and high purity are utilized to prepare high purity magnesium oxide, thus the benefit of resource utilization can be increased, the brine of natural alkali can be used locally and the optimal industrial product with maximum benefit and technology can be obtained.

Description

technical field [0001] The invention belongs to the brine chemical industry, and relates to a method for adopting characteristic natural alkali brine as a precipitation medium, reacting with industrial magnesium chloride solution to generate hydrated basic magnesium carbonate, and then producing high-purity magnesium oxide. Background technique [0002] my country is the largest producer of magnesium series products. The annual output of magnesium series products has reached more than 8 million tons, of which magnesium oxide products account for the largest proportion. Products such as light-burned magnesia, dead-burned magnesia and fused magnesia obtained by calcination of magnesite occupy the largest share in the international market. However, the production of magnesia chemical materials in my country is relatively backward, which is characterized by small scale of enterprises, low purity of products and serious environmental pollution. Develop high-purity magnesium oxid...

Claims

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Application Information

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IPC IPC(8): C01F5/24C01F5/06
Inventor 姚明顺张志
Owner 河南元亨精细化工有限公司
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