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Method for producing low chlorine high purity magnesia by soda ash method

A magnesium oxide, high-purity technology, applied in magnesium oxide and other directions, can solve the problems of high energy consumption, small particles, difficult washing and dehydration, etc.

Inactive Publication Date: 2013-02-27
桐柏兴源化工有限公司
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Problems solved by technology

However, because the basic magnesium carbonate particles produced by this method are small, it is difficult to wash and dehydrate. To obtain one ton of qualified magnesium oxide, 80 to 100 tons of water needs to be used; and the water content of the filter cake sometimes exceeds 80% after using plate and frame filtration. , high energy consumption

Method used

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  • Method for producing low chlorine high purity magnesia by soda ash method

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Embodiment Construction

[0012] A method for producing low-chlorine high-purity magnesium oxide by a soda ash method is characterized in that it comprises the following steps:

[0013] Weigh 2000kgMgCl 2 .6H 2 O is added to the stirring tank, put into 4000 L, 60 ℃ hot water, and fully stirred, then the magnesium chloride solution is added to the sand filter, the solid particles in it are filtered, added to the enamel reaction kettle, and heated to 80°C. The soda ash solution of total alkali at 180 g / L enters the metering tank, wherein the volume is 5000 L, and is added to the reaction kettle for reaction. The total volume of the filtrate after the reaction is 9 m 3 , and then enter the first-stage belt filter, pass through the first-stage filtration section, the first-stage washing section, the second-stage washing section, and the third-stage washing section, and then wash in the first-stage pulp tank, and then enter the second-stage belt filter The secondary filtration section, the fourth-stage w...

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Abstract

The present invention discloses a method for producing low chlorine high purity magnesia by taking hydrated magnesium chloride or a magnesium chloride solution and soda ash as raw materials. The method includes utilizing two filter devices (belt vacuum filter machine) having best washing effect as a washing device, at the same time performing slurrying washing twice, and using a filter device (a centrifugal machine) with best dehydrating effect for dehydration treatment. When the water content is reduced to less than 65%, basic magnesium carbonate is obtained, and then dried and calcined to get the high purity magnesia product with Cl less than 0.07% (by mass percentage). The method enables the magnesia product to reach the class of national superior products, and helps to reduce the amount of washing water and the energy consumption for drying.

Description

technical field [0001] The invention belongs to the brine chemical industry, and relates to a method for preparing low-chloride high-purity magnesium oxide by using magnesium chloride brine as the main raw material and reacting with soda ash. Background technique [0002] The production of magnesia chemical material products in my country is relatively backward, which is characterized by small scale of enterprises, low product purity, serious environmental pollution, etc. Among them, magnesium chloride or bischofite (MgCl 2 ·6H 2 O) The chemical reaction between resources and soda ash to generate basic magnesium carbonate intermediate product, and then calcining to produce magnesia is a process with a history of 100 years. Its equipment investment is small, and the quality of light magnesia produced can easily reach the national first-class product standards. However, because the basic magnesium carbonate particles produced by this method are small, it is difficult to wash...

Claims

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Application Information

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IPC IPC(8): C01F5/06
Inventor 杨刚姚明顺张志
Owner 桐柏兴源化工有限公司
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