Preparation process for anhydrous magnesium carbonate

Anhydrous magnesium carbonate and preparation technology, applied in the direction of magnesium carbonate, etc., can solve the problems of high impurity content, complicated preparation process of anhydrous magnesium carbonate, etc., and achieve low impurity content, significant economic and social benefits, and easy availability of raw materials Effect

Inactive Publication Date: 2015-11-18
韦海棉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that, aiming at defects such as complex preparation process and high impurit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation technology of anhydrous magnesium carbonate, comprises the following steps:

[0026] S1. Prepare a magnesium salt solution with a concentration of 0.3mol / L, add 0.2g / L of dispersant, and stir slowly;

[0027] S2. Prepare an ammonia solution with a concentration of 0.1mol / l, and feed a certain amount of CO 2 gas that makes NH4 + with CO 2 The molar ratio is 2:1;

[0028] S3, adding 0.1g / L nano silicon dioxide powder to the S2 product, and stirring slowly;

[0029] S4. Synchronously add the products of S1 and S3 into the reaction vessel, the reaction temperature is 60°C, and finally maintain Mg 2+ : NH 4+ :CO 2 The mol ratio is 1:4:2, slowly stirred for 10 minutes;

[0030] S5, adding the S4 product into a high-temperature and high-pressure reactor, and performing a hydrothermal reaction at a temperature of 100° C. for 24 hours;

[0031] S6. After cooling the product of S5 for 12 hours, filter it, wash the obtained filter cake three times wit...

Embodiment 2

[0040] A kind of preparation technology of anhydrous magnesium carbonate, comprises the following steps:

[0041] S1. Prepare a magnesium salt solution with a concentration of 3mol / L, add a dispersant of 1.2g / L, and stir slowly;

[0042] S2. Prepare an ammonia solution with a concentration of 1mol / l, and feed a certain amount of CO 2 gas that makes NH4 + with CO 2 The molar ratio is 2:1;

[0043] S3, adding 1.3g / L nano-silica powder to the S2 product, and stirring slowly;

[0044] S4. Synchronously add the products of S1 and S3 into the reaction vessel, the reaction temperature is 80°C, and finally maintain Mg 2+ : NH 4+ :CO 2 The mol ratio is 1:4:2, slowly stirred for 10 minutes;

[0045] S5, adding the S4 product into a high-temperature and high-pressure reactor, and performing a hydrothermal reaction at a temperature of 200° C. for 8 hours;

[0046] S6. After cooling the product of S5 for 12 hours, filter it, wash the obtained filter cake three times with water, and...

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PUM

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Abstract

The invention relates to the field of inorganic chemical synthesis and discloses a preparation process for anhydrous magnesium carbonate. According to the process disclosed by the invention, magnesium carbonate prepared by way of synchronous charge is added into a high-temperature and high-pressure reaction kettle for hydro-thermal treatment to obtain an anhydrous magnesium carbonate product. According to the process disclosed by the invention, used raw materials are easily available and are low in price, so that the preparation process is easily amplified for industrial production. The process disclosed by the invention is reasonable, and the product is wide in application field and huge in market potential, so that the preparation process has remarkable economical and social benefits.

Description

technical field [0001] The invention relates to the field of inorganic chemical synthesis, in particular to a preparation process of anhydrous magnesium carbonate. Background technique [0002] Anhydrous magnesium carbonate, as an important part of magnesium series crystal materials, is mainly used in fireproof coatings, inks, pottery, glass, toothpaste, rubber fillers, etc. At present, the so-called magnesium carbonate products for short on the market are all hydrated basic magnesium carbonate except natural magnesite magnesium carbonate. In the existing domestic and foreign hydrated basic magnesium carbonate production processes, there is no special technology that can produce anhydrous magnesium carbonate composed of a single phase. [0003] Magnesium carbonate is an important inorganic chemical material with good filling, dispersibility and flame retardancy. Adding it to engineering plastics can significantly improve the high temperature resistance and flame retardancy ...

Claims

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Application Information

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IPC IPC(8): C01F5/24
Inventor 韦海棉
Owner 韦海棉
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