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Method of producing magnesium hydroxide

A magnesium hydroxide and magnesium chloride solution technology, applied in the direction of magnesium hydroxide, magnesium oxide, etc., can solve the problems of environmental pollution and waste of resources, and achieve the effects of low production costs, increased corporate profits, and flexible and adjustable product solutions

Active Publication Date: 2008-05-07
河北镁神科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, magnesium sulfate produced by industry, such as magnesium sulfate mother liquor produced by sulfuric acid method to produce boric acid, by-products of titanium dioxide produced by acid method, magnesium sulfate by-product of non-ferrous metallurgy industry, etc., if not fully utilized, not only waste resources, and may pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take 800mL of magnesium sulfate solution with a concentration of 20% and place it in a 2000mL reaction tank, slowly add 370g of calcium chloride solution with a concentration of 40% at 35°C under stirring for 1 hour. Continue to stir for 30 minutes after the dropwise addition, filter, wash and dry the filter cake to obtain the calcium sulfate product. Filtrate is magnesium chloride solution;

[0027] (2) Place the magnesium chloride solution obtained in step (1) in a 2000mL reaction tank, and slowly add 493g of milk of lime with a concentration of 20% under conditions of stirring at a temperature of 40°C. Stirring was continued for 1 h after the addition was completed, the slurry was filtered, and the filter cake was filtered, washed and dried to obtain 75 g of magnesium hydroxide product with a purity of 98.3%. The filtrate is calcium chloride solution, which can be returned to the metathesis reaction for recycling.

Embodiment 2

[0029] (1) Get 800mL concentration of 30% magnesium sulfate solution and place it in a 2000mL reaction tank. Slowly add 634g concentration of 35% calcium chloride solution at 55°C under stirring for 1 hour. Continue to stir for 30 minutes after the dropwise addition, filter, wash and dry the filter cake to obtain the calcium sulfate product. Filtrate is magnesium chloride solution;

[0030] (2) Place the magnesium chloride solution obtained in step (1) in a 2000mL reaction tank, and slowly add 592g of milk of lime with a concentration of 25% under conditions of stirring at a temperature of 50°C. Stirring was continued for 1 h after the addition was completed, the slurry was filtered, and the filter cake was filtered, washed and dried to obtain 114 g of magnesium hydroxide product with a purity of 98.5%. The filtrate is calcium chloride solution, which can be returned to the metathesis reaction for recycling.

Embodiment 3

[0032] (1) Take 800mL of magnesium sulfate solution with a concentration of 35% and place it in a 2000mL reaction tank. Slowly add 518g of calcium chloride solution with a concentration of 50% at 80°C under stirring for 1 hour. Continue to stir for 30 minutes after the dropwise addition, filter, wash and dry the filter cake to obtain the calcium sulfate product. Filtrate is magnesium chloride solution;

[0033] (2) Place the magnesium chloride solution obtained in step (1) in a 2000mL reaction tank, and slowly add 576g of milk of lime with a concentration of 30% under conditions of stirring at a temperature of 70°C. Stirring was continued for 1 h after the addition, and the slurry was filtered, and the filter cake was filtered, washed, and dried to obtain 133 g of magnesium hydroxide product with a purity of 98.1%. The filtrate is calcium chloride solution, which can be returned to the metathesis reaction for recycling.

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Abstract

The invention discloses a preparation method of magnesium hydroxide by using magnesium sulfate and lime milk as raw materials, and the invention has the concrete process that a magnesium sulfate solution with a certain concentration can be used to conduct the metathesis reaction with a calcium chloride solution to produce the magnesium chloride solution and calcium sulfate precipitation; the filter mass is washed and dried after the solid-liquid separation to generate calcium sulfate products; the filter liquid continues to counteract with lime milk with a certain concentration to produce the calcium chloride solution and the magnesium hydroxide precipitation; and then the filter mass is washed, dried and crashed after the solid-liquid separation to generate magnesium hydroxide products; and then the filter liquid returns to the metathesis reaction for recycling. The invention with low producing cost remarkably improves environmental and economic benefits.

Description

technical field [0001] The invention discloses a preparation method of magnesium hydroxide. The raw materials used are magnesium sulfate and milk of lime, and the by-product is calcium sulfate. Background technique [0002] Magnesium hydroxide is an important multifunctional inorganic powder material, which can be used as a new type of inorganic flame retardant, flue gas desulfurizer, neutralizer for acidic wastewater, and heavy metal remover for water, etc. [0003] At present, the main production methods of magnesium hydroxide products include two categories. One is to use natural brucite resources to directly produce magnesium hydroxide through refining; the other is to produce magnesium hydroxide through reaction conversion of raw materials containing magnesium. The reaction conversion method is divided into two types, one is obtained by hydrating light-burned magnesium (light magnesium oxide), and the other is obtained by metathesis reaction of magnesium-containing raw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C01F5/08
Inventor 刘宝树宋丽英刘润静胡永琪胡庆福
Owner 河北镁神科技股份有限公司
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