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Process for preparing magnesium carbonate whisker

A technology of magnesium carbonate whiskers and magnesium bicarbonate, which is applied in directions such as magnesium carbonate, can solve the problems of low purity, excessively large specific surface area of ​​basic magnesium carbonate, poor mechanical properties of secondary agglomerated particles, etc. simple effect

Inactive Publication Date: 2003-12-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is exactly to solve the shortcoming that the specific surface area of ​​basic magnesium carbonate is too large, the purity is low, and the mechanical properties of the secondary agglomerated particles are relatively poor, in order to prepare a kind of containing impurity very few, can be used as preparation high purity basic carbonate Intermediates of magnesium, magnesium oxide, magnesium chloride, magnesium hydroxide, and magnesium carbonate whiskers for reinforcement and modification of plastics, rubber, coatings, inks, etc.; thus providing a molecular formula of MgCO 3 ·nH 2 O, a kind of magnesium carbonate whisker in n=(1~5) and preparation method

Method used

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  • Process for preparing magnesium carbonate whisker
  • Process for preparing magnesium carbonate whisker

Examples

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Effect test

Embodiment 1

[0027] Calcinate 1000g of magnesite at 800°C for 2 hours, digest it with 20kg of tap water to form a slurry of magnesium hydroxide, cool it down to 40°C, pass carbon dioxide gas into it for carbonization reaction, and filter the slurry to obtain carbonic acid after reacting for 4 hours. Aqueous solution of magnesium hydrogen. Put 1000ml of the obtained magnesium bicarbonate aqueous solution into a beaker, add 1g of the additive sodium dihydrogen phosphate, and stir at a speed of 5rpm. After the additive is completely dissolved, heat the beaker to 65°C and increase the stirring speed to 120rpm. After 30 minutes of reaction, The resulting slurry was filtered and washed five times with 300 ml of deionized water. The filter cake obtained after washing and filtering was dried at 110° C. for 2 hours to obtain whiskers of magnesium carbonate.

[0028] The whisker of magnesium carbonate obtained by the present embodiment is: have molecular formula: MgCO 3 ·3H 2 O, with a diameter o...

Embodiment 2

[0030] The method for preparing the magnesium bicarbonate solution is the same as in Example 1. Put 1000ml of the magnesium bicarbonate aqueous solution into a beaker, add 2g of the additive ammonium dihydrogen phosphate, and stir at a speed of 5rpm. After the additive is completely dissolved, heat the beaker to 50°C and increase the stirring. The speed was increased to 120 rpm, and after reacting for 40 minutes, the obtained slurry was filtered and washed with deionized water 5 times, 300 ml each time. The filter cake obtained after washing and filtering was dried at 110° C. for 2 hours to obtain whiskers of magnesium carbonate. The whisker of magnesium carbonate obtained by the present embodiment is: have molecular formula: MgCO 3 ·5H 2 O, with a diameter of 0.1-0.5 μm and a whisker length of 20-100 μm.

Embodiment 3

[0032] Take 80 g of chemically pure ammonium bicarbonate and 120 g of magnesium sulfate heptahydrate, heat them with 1000 ml of water respectively and mix them to obtain a mixed solution of magnesium bicarbonate and ammonium sulfate. Take 1000ml of this magnesium bicarbonate aqueous solution into a beaker, add 1g of sodium dodecylbenzenesulfonate, and stir at a speed of 5rpm. After the additive is completely dissolved, heat the beaker to 70°C, increase the stirring speed to 100rpm, and react for 20 minutes Afterwards, the obtained slurry was filtered and washed 5 times with deionized water, 300 ml each time. The filter cake obtained after washing and filtering was dried at 110° C. for 2 hours to obtain whiskers of magnesium carbonate. The whisker of magnesium carbonate obtained by the present embodiment is: have molecular formula: MgCO 3 ·3H 2 O, with a diameter of 0.5-1 μm and a whisker length of 60-200 μm.

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Abstract

The present invention is the process of preparing magnesium carbonate crystal whisker from magnesium bicarbonate solution. Into magnesium bicarbonate solution, proper amount of additive is added, and through controlling the crystallization condition, magnesium carbonate crystal whisker in different sizes is prepared. Thus obtained magnesium carbonate crystal whisker has diameter of 0.1-5 microns and length of 10-2000 microns, may be used as reinforcing material for paint, plastic, rubber, etc. and may be used also as the intermediate product for preparing high-purity magnesia and other magnesium salt. The present invention opens new way for the comprehensive utilization of magnesium salt and has excellent application foreground.

Description

field of invention [0001] The invention relates to the technical field of preparation chemicals, in particular to a method for preparing magnesium carbonate whiskers from an aqueous solution of magnesium bicarbonate. Background technique [0002] Magnesium carbonate whiskers are single crystals of magnesium carbonate. Compared with ordinary basic magnesium carbonate, the crystals of magnesium carbonate whiskers are completely developed, and the whiskers are colorless and transparent. The crystal contains few defects, the crystal contains few impurities, and the crystal has high strength. Therefore, magnesium carbonate whiskers can be used to prepare high-purity magnesium oxide, magnesium hydroxide, basic magnesium carbonate, magnesium sulfate, magnesium chloride, magnesium nitrate, and other magnesium salt products. At the same time, due to the good mechanical properties of magnesium carbonate whiskers, magnesium carbonate whiskers can also be ...

Claims

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Application Information

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IPC IPC(8): C01F5/24
Inventor 王万平张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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