Method for preparing magnesium hydroxide by utilizing light calcined dolomite

A technology of lightly burning dolomite and magnesium hydroxide, applied in the direction of magnesium hydroxide, etc., can solve the problems of relatively expensive organic amines, and achieve the effects of low price, low operating costs, and small amine circulation volume

Inactive Publication Date: 2012-01-04
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As a base, organic amines can provide OH- with inorganic bases such as sodium hydroxide, calcium hydroxide and ammonia water when precipitating metal ions. However, organic amines are more expensive, so they are rarely used in industry to precipitate metals. ions, unless there is a reasonable method for recovering organic amines. In 1992, Xu Zhenliang et al. reported "Thermodynamics of Carbonates Prepared by Tertiary Amines", mentioning that tertiary amines can absorb carbon dioxide. In addition, there are numerous documents and patents reporting organic Amines such as diethanolamine and triethanolamine are used to recover carbon dioxide in industrial tail gas

Method used

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  • Method for preparing magnesium hydroxide by utilizing light calcined dolomite
  • Method for preparing magnesium hydroxide by utilizing light calcined dolomite

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Embodiment 1

[0031] The raw materials used in the present invention have a. 1 part of light-burned dolomite raw material, measure calcium, magnesium ion content in the raw material before use, after measuring the mol ratio of calcium oxide and magnesium element is at 1: 1, calcium oxide and magnesium oxide use The amount is 1mol; b. 1 part of organic amine, the organic amine is di-n-butylamine, the molar ratio of the amount of 1 part of organic amine to the amount of magnesium contained in 1 part of light-burned dolomite raw material is 2.1:1, using organic The amount of amine is 2.1mol; c. sulfuric acid, 1 part, the sulfate radical content in the raw material is measured before use, the mol ratio of its sulfate radical content and the organic amine in the circulation process is measured to be 1: 2, and the usage amount is 1.05mol; d. 1 part of magnesium nitrate, the amount used is 1 mol. Magnesium nitrate is used as an initial raw material to start the process cycle and to replenish the l...

Embodiment 2

[0035]The raw materials used in the present invention have a. 1 part of light-burned dolomite raw material, measure calcium, magnesium ion content in the raw material before use, after measuring the mol ratio of calcium oxide and magnesium element is at 1.5: 1, calcium oxide and magnesium oxide use The amounts are 1.5mol and 1mol respectively; b. 1 part of organic amine, the organic amine is n-hexylamine, the molar ratio of the amount of 1 part of organic amine to the amount of magnesium contained in 1 part of light-burned dolomite raw material is 2.4:1, using The amount of organic amine is 2.4mol; c. Sulfuric acid, 1 part, the sulfate content in the raw material is measured before use, and the molar ratio between the sulfate content and the organic amine in the circulation process is 1.5:2, and the usage amount is 1.8mol ; d. 1 part of magnesium nitrate, the amount used is 1mol. Magnesium nitrate is used as an initial raw material to start the process cycle and to replenish t...

Embodiment 3

[0039] The raw materials used in the present invention have a. 1 part of light-burned dolomite raw material, before use, measure the content of calcium and magnesium ions in the raw material, after measuring the mol ratio of calcium oxide and magnesium element is 1.2: 1, calcium oxide and magnesium oxide use The amounts are 1.2mol and 1mol respectively; b. 1 part of organic amine, which is di-n-pentylamine, and the molar ratio of the amount of 1 part of organic amine to the amount of magnesium contained in 1 part of light-burned dolomite raw material is 2.2:1 , the amount of organic amine used is 2.2mol; c. sulfuric acid, 1 part, the sulfate content in the raw material is measured before use, and the molar ratio of its sulfate content and the organic amine in the circulation process is 1.3: 2 after measuring, and the usage amount is 1.43mol; d. 1 part of magnesium nitrate, the amount used is 1mol. Magnesium nitrate is used as an initial raw material to start the process cycle ...

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Abstract

The invention relates to a method for preparing magnesium hydroxide by utilizing light calcined dolomite. The method comprises the following steps: firstly, preparing magnesium nitrate or magnesium chloride into a 0.1-4 mol/L solution; adding organic amine in the solution, and evenly stirring; reacting for 0.5-2 hours at the temperature of 10 DEG C-100 DEG C, and then filtering; and washing and drying filter residue so as to obtain magnesium hydroxide, and entering filtrate into a cycle process. The method has the advantages that 1) production raw material cost is reduced; 2) energy consumption is low, and amine can be separated from the solution through a liquid separation method, thereby avoiding the ammonia distillation operation in an ammonia-soda process and simultaneously avoiding the pollution of ammonia volatilization to environment; and 3) operation cost is low, magnesium hydroxide is precipitated with organic amine so that a certain amount of organic amine is adsorbed when magnesium hydroxide is generated, thus magnesium hydroxide has the hydrophobic characteristic, the filtration speed of magnesium hydroxide is extremely high when filtration is carried out, the filtration speed is larger than 0.01 L/s.m<2>, and magnesium hydroxide is easy to wash, thus the operation cost of the process is reduced.

Description

technical field [0001] The invention relates to a method for preparing magnesium hydroxide by using lightly burned dolomite, which belongs to the field of inorganic chemical industry. Background technique [0002] Magnesium hydroxide is a white insoluble powder, widely used in PE, PP, PVC, ABS, PS, HIPS, PA, PBT, unsaturated polyester, epoxy resin, rubber, paint flame retardant filler; in environmental protection On the one hand, as a flue gas desulfurizer, it can replace caustic soda and lime as a neutralizer for acid-containing wastewater; as an oil additive, it can prevent corrosion and desulfurize; it can be used in the electronics industry, medicine, and sugar refining; it can be used as an insulation material And manufacture other magnesium salt products. [0003] At present, there are many reports on the preparation of magnesium hydroxide using lightly burned dolomite as raw material. The most successful process in industrialization is the carbonization method. Magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/16
Inventor 张勇李俊陈周丹胡学雷
Owner WUHAN INSTITUTE OF TECHNOLOGY
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