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Process for preparing trihydrate magnesium carbonate crystal whiskers through microwave method

A technology of magnesium carbonate trihydrate and microwave method, which is applied in the field of mineral processing, can solve the problems of low yield of magnesium carbonate trihydrate whiskers, high energy consumption, long reaction time, etc., and achieve high yield, energy saving and environmental protection, The effect of short reaction times

Inactive Publication Date: 2013-02-20
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the synthesis of magnesium carbonate trihydrate whiskers mainly adopts the water bath method. Although this method has the advantages of making the reaction materials heated evenly and being convenient for observation, in the process of preparing the magnesium carbonate trihydrate whiskers, the reaction time of the method is long, and the synthetic Magnesium carbonate trihydrate whisker yield is relatively low, energy consumption is relatively high

Method used

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  • Process for preparing trihydrate magnesium carbonate crystal whiskers through microwave method
  • Process for preparing trihydrate magnesium carbonate crystal whiskers through microwave method
  • Process for preparing trihydrate magnesium carbonate crystal whiskers through microwave method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take the magnesium chloride hexahydrate solution with a concentration of 0.3mol / L into the reaction tank, add the ammonium carbonate solution with a concentration of 0.4mol / L into the magnesium chloride hexahydrate solution within 10s at room temperature, and the mixture of magnesium chloride hexahydrate and ammonium carbonate The molar ratio of the added amount is 1:1.3, while stirring, the stirring speed is 100r / min, and the stirring is continued for 2~3 minutes after the solution is mixed;

[0023] (2) Move the reaction tank containing the mixed material to the microcomputer microwave chemical reactor, and continue stirring during the reaction process. After reacting for 10 minutes under the condition of stirring rate of 80r / min and microwave power of 240W, stop the reaction and wait for microwave After the temperature of the reactor is lowered to room temperature, the reaction slurry in the reaction tank is centrifuged and dehydrated in a low-speed centrifuge, an...

Embodiment 2

[0028] (1) Take the magnesium chloride hexahydrate solution with a concentration of 0.5mol / L into the reaction tank, add the ammonium carbonate solution with a concentration of 1.1mol / L into the magnesium chloride hexahydrate solution within 8s at room temperature, the magnesium chloride hexahydrate and ammonium carbonate The molar ratio of the added amount is 1:1.2, while stirring, the stirring speed is 200r / min, and the stirring is continued for 2~3 minutes after the solution is mixed;

[0029] (2) Move the reaction tank containing the mixed material to a microcomputer microwave chemical reactor, and continue to stir during the reaction. After reacting for 7 minutes under the condition of stirring rate of 100r / min and microwave power of 360W, stop the reaction and wait for microwave After the temperature of the reactor is lowered to room temperature, the reaction slurry in the reaction tank is centrifuged and dehydrated in a low-speed centrifuge, and the obtained solid produc...

Embodiment 3

[0034] (1) Take the magnesium chloride hexahydrate solution with a concentration of 0.6mol / L into the reaction tank, add the ammonium carbonate solution with a concentration of 1.5mol / L to the magnesium chloride hexahydrate solution within 5s at room temperature, the magnesium chloride hexahydrate and ammonium carbonate Add the molar ratio of 1:1.5, stir at the same time, the stirring speed is 500r / min, and continue to stir for 2~3 minutes after the solution is mixed;

[0035] (2) Move the reaction tank containing the mixed material to the microcomputer microwave chemical reactor, and continue to stir during the reaction process. After reacting for 5 minutes under the condition of stirring rate of 150r / min and microwave power of 480W, stop the reaction and wait for microwave After the temperature of the reactor is lowered to room temperature, the reaction slurry in the reaction tank is centrifugally dehydrated in a low-speed centrifuge, and the obtained solid product is washed ...

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Abstract

The invention belongs to the field of mineral processing and particularly relates to a process for preparing trihydrate magnesium carbonate crystal whiskers through a microwave method. The process comprises the steps of mixing a magnesium chloride hexahydrate solution and an ammonium carbonate solution in a reaction tank, transferring to a microcomputer microwave chemical reactor, conducting centrifugal dewatering after mixing for reaction, and drying solid products to obtain trihydrate magnesium carbonate crystal whiskers; heating a centrifugal liquid in a synthetic tower, adding water in the residual liquid to serve as a solvent, reacting with magnesium chloride hexahydrate to prepare the magnesium chloride hexahydrate solution of 0.3-0.6mol / L, and repeating reaction steps. According to the process, the microwave method is used for preparing trihydrate magnesium carbonate crystal whiskers, the synthetic method is high in efficiency, uniform in heating, short in reaction time, high in yield, energy-saving and environment-friendly, and the synthetic method is a synthetic technology having great potential advantages.

Description

technical field [0001] The invention belongs to the field of mineral processing, in particular to a method for preparing magnesium carbonate trihydrate whiskers by a microwave method. Background technique [0002] Magnesium carbonate trihydrate whiskers are single crystals of magnesium carbonate with the chemical formula MgCO 3 ·3H 2 O, compared with ordinary basic magnesium carbonate, magnesium carbonate trihydrate whisker crystals are not only fully developed, the whiskers are colorless and transparent, and the crystals contain fewer defects, and the crystal strength is high. Magnesium carbonate trihydrate whiskers can be used to prepare High-purity magnesium sulfate, magnesium hydroxide, basic magnesium carbonate, magnesium oxide, magnesium nitrate and other magnesium salt products, and because of its good mechanical properties, magnesium carbonate trihydrate whiskers can not only be directly used in plastics, rubber, coatings , ink, etc. enhancement and modification, a...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B29/62C30B7/14
Inventor 闫平科高玉娟王来贵
Owner LIAONING TECHNICAL UNIVERSITY
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