Method for preparing magnesium hydroxide from acid-dissolved magnesium ion-containing raw materials

A technology of magnesium hydroxide and magnesium ions, applied in directions such as magnesium hydroxide, can solve the problems of expensive organic amines, etc., and achieve the effects of low price, low operating cost and easy washing

Inactive Publication Date: 2012-02-15
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 from acid-dissolved magnesium ion-containing raw materials
  • Method for preparing magnesium hydroxide from acid-dissolved magnesium ion-containing raw materials

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Effect test

Embodiment 1

[0031] The raw materials used in the present invention include a. 1 part of acid-dissolvable magnesium ionic raw material, which is brucite, and the content of magnesium element in the raw material is measured before use, and the magnesium element is 1mol; b. 1 part of organic amine, which is dinormal Butylamine, 2.0mol of di-n-butylamine; c. 1 part of calcium oxide-containing raw material, measure the effective calcium oxide content in the raw material before use, and the calcium oxide is 1 mol; d. Sulfuric acid, 1 part, measure the sulfate radical content in the raw material before use , the sulfate radical is 1 mol; e. 1 part of calcium chloride is 1 mol. Calcium chloride is used as an initial raw material to start the process cycle and to replenish the loss of chloride ions during the cycle.

[0032] The start-up step of the process cycle of the present invention is firstly preparing calcium chloride into a 1mol / L solution, then slowly adding concentrated sulfuric acid int...

Embodiment 2

[0036] The raw materials used in the present invention include a. 1 part of acid-dissolvable magnesium ionic raw material, which is sorbite, and the content of magnesium element in the raw material is measured before use, and the magnesium element is 1 mol; b. 1 part of organic amine, which is two n-pentylamine, di-n-pentylamine is 2.3mol; c. 1 part of calcium oxide-containing raw material, the effective calcium oxide content in the raw material is measured before use, and the calcium oxide is 1.5 mol; d. sulfuric acid, 1 part, the sulfuric acid in the raw material is measured before use Root content, sulfate root is 1.5mol; e. 1 part of calcium chloride is 1mol. Calcium chloride is used as an initial raw material to start the process cycle and to replenish the loss of chloride ions during the cycle.

[0037] The start-up step of the process cycle of the present invention is firstly preparing calcium chloride into a 4mol / L solution, then slowly adding concentrated sulfuric acid ...

Embodiment 3

[0040] The raw materials used in the present invention include a. 1 part of acid-elutable magnesium ionic raw material, which is magnesite, and the content of magnesium element in the raw material is measured before use, and the magnesium element is 1 mol; b. 1 part of organic amine, which is n-hexylamine , n-hexylamine is 2mol; c. 1 part of calcium oxide-containing raw material, the effective calcium oxide content in the raw material is measured before use, and the calcium oxide is 1.3 mol; d. sulfuric acid, 1 part, the sulfate radical content in the raw material is measured before use, and the sulfate radical is 1.3mol; e. 1 part of calcium chloride is 1mol. Calcium chloride is used as an initial raw material to start the process cycle and to replenish the loss of chloride ions during the cycle.

[0041] The starting step of the process cycle of the present invention is firstly preparing calcium chloride into a 0.1mol / L solution, then slowly adding concentrated sulfuric acid...

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Abstract

The invention relates to a method for preparing magnesium hydroxide from acid-dissolved magnesium ion-containing raw materials. The method comprises the following steps of 1, preparing calcium nitrate or calcium chloride into 0.1 to 4 mol/L of a solution, 2, adding slowly concentrated sulfuric acid into the solution, 3, carrying out filtration, 4, washing the filter residues obtained by the step 3 to obtain gypsum, and 5, feeding the filtrate obtained by the step 3 into a circulation system. The method has the advantages that 1, costs are low; calcium oxide is utilized as an alkalizer and organic amine is utilized as a precipitating agent for recycle so that detects of a calcium oxide method are avoided; an amine circulation volume is reduced; deposition efficiency is improved; and raw material costs are reduced; 2, energy consumption is low; and the pollution caused by ammonia volatilization is avoided; and 3, an operation cost is reduced; the method adopts organic amine to deposit magnesium hydroxide so that magnesium hydroxide can adsorb a certain amount of organic amine in magnesium hydroxide generation and thus having a hydrophobic characteristic; a filtration rate is very high and is greater than 0.01L/s*m<2>; washing is easy; and an operation cost of the method is reduced.

Description

technical field [0001] The invention relates to a method for preparing magnesium hydroxide by using acid-dissolvable magnesium ionic raw materials, 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 raw materials for preparing magnesium hydroxide, such as magnesium chloride, magnesium nitrate, magnesium sulfate, etc., which can dissolve magnesium ions in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22
Inventor 张勇周莹莹罗晶石和彬
Owner WUHAN INSTITUTE OF TECHNOLOGY
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