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The method that utilizes magnesium sulfate raw material to prepare magnesium hydroxide

A technology of magnesium hydroxide and magnesium sulfate, applied in directions such as magnesium hydroxide, can solve the problems of expensive organic amines, and achieve the effects of low price, convenient operation and small circulation

Inactive Publication Date: 2011-12-14
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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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  • The method that utilizes magnesium sulfate raw material to prepare magnesium hydroxide
  • The method that utilizes magnesium sulfate raw material to prepare magnesium hydroxide
  • The method that utilizes magnesium sulfate raw material to prepare magnesium hydroxide

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Embodiment 1

[0028] The raw materials used in the present invention include a. 1 part of calcium nitrate, which is 1 mol; b. 1 part of organic amine, which is di-n-butylamine, which is 2 mol; Calcium content is 1mol; d. 2 parts of magnesium sulfate raw material, the magnesium sulfate content is measured before use, each part is 1mol.

[0029] The start-up step of the process cycle of the present invention is firstly preparing calcium nitrate into a 1mol / L solution, then slowly adding the magnesium sulfate raw material into the solution, and then filtering to obtain filter residue A (i.e. raw gypsum) and filtrate A (i.e. magnesium nitrate solution ), the filter residue A is washed to obtain raw gypsum, and the filtrate A enters the circulation process. The steps of the circulation process are: 1) the preparation of magnesium hydroxide: adding the organic amine to the filtrate A, stirring evenly, and the temperature is 20 DEG C. React for 0.5 hours, then filter to obtain filter residue B (i....

Embodiment 2

[0034] The raw materials used in the present invention have a. 1 part of calcium nitrate, which is 1 mol; b. 1 part of organic amine, which is di-n-pentylamine, which is 2.4 mol; c. 1 part of calcium oxide-containing raw material, which is effective before use Calcium oxide content is 1.2mol; d. 2 parts of magnesium sulfate raw material, the magnesium sulfate content is measured before use, each part is 1mol.

[0035] The starting step of the process cycle of the present invention is firstly preparing calcium nitrate into a 0.1mol / L solution, then slowly adding the magnesium sulfate raw material into the solution, and then filtering to obtain filter residue A (i.e. raw gypsum) and filtrate A (i.e. magnesium nitrate solution), the filter residue A is washed to obtain raw gypsum, and the filtrate A enters the circulation process. The steps of the circulation process are: 1) the preparation of magnesium hydroxide: adding the organic amine to the filtrate A, stirring evenly, at a t...

Embodiment 3

[0038] The raw materials used in the present invention have a. 1 part of calcium nitrate, which is 1 mol; b. 1 part of organic amine, which is n-hexylamine, which is 2.2 mol; The content is 1.5 mol; d. 2 parts of magnesium sulfate raw material, the content of magnesium sulfate in it is measured before use, and each part is 1 mol.

[0039]The start-up step of the process cycle of the present invention is firstly preparing calcium nitrate into a 1.5mol / L solution, then slowly adding the magnesium sulfate raw material into the solution, and then filtering to obtain filter residue A (i.e. raw gypsum) and filtrate A (i.e. magnesium nitrate solution), the filter residue A is washed to obtain raw gypsum, and the filtrate A enters the circulation process. The steps of the circulation process are: 1) Preparation of magnesium hydroxide: adding organic amines to the filtrate A, stirring evenly, at a temperature of 50 ° C React for 0.5 hours, then filter to obtain filter residue B (i.e. m...

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Abstract

The invention relates to a method for preparing magnesium hydroxide utilizing magnesium sulfate as a raw material, and the method comprises the following steps of: firstly preparing a 0.1- 4 mol / L solution from calcium nitrate or calcium chloride, then slowly adding magnesium sulfate used as the raw material to the solution, then filtering to obtain filter residue and filtrate, washing the filterresidue to obtain gypsum, and introducing the filtrate into a circulation process. The method provided by the invention has the following advantages: 1) the cost is low, calcium oxide used as an alkalizer and an organic amine used as a precipitating agent can be recycled, thereby avoiding the defects of a calcium oxide method, simultaneously the amine circulation amount is low, the precipitation efficiency is high and the production raw material cost is reduced; 2) the energy consumption is low and environmental pollution caused by ammonia volatilization is avoided; and 3) the operation cost is low, the organic amine is used to precipitate magnesium hydroxide in the method, so that magnesium hydroxide adsorbs a certain amount of organic amine during generation and has hydrophobic property, the filtration speed is high and is more than 0.01 L / s.m<2> during filtering, washing is easy and the process operation cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing magnesium hydroxide by using magnesium sulfate raw material, 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, the preparation methods of high-purity magnesium hydroxide mainly include sodium hydroxide method, ammonia-soda method and calcium oxide method. The cost of sodium hydroxide method is high...

Claims

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Application Information

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IPC IPC(8): C01F5/22
Inventor 张勇朱永昌吴凯鲍世聪
Owner WUHAN INSTITUTE OF TECHNOLOGY
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