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A kind of method for preparing magnesium carbonate trihydrate whisker by ultrasonic wave

A magnesium carbonate trihydrate and ultrasonic technology, applied in the field of mineral processing, can solve the problems of high energy consumption, long reaction time, low yield of magnesium carbonate trihydrate whiskers, etc., to achieve increased reaction temperature, fast reaction speed, and no need for heating Effect

Inactive Publication Date: 2017-11-21
LIAONING TECHNICAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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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 magnesium carbonate whiskers, the method has a long reaction time and is difficult to synthesize. The magnesium carbonate trihydrate whisker product yield is relatively low, and energy consumption is relatively high

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  • A kind of method for preparing magnesium carbonate trihydrate whisker by ultrasonic wave
  • A kind of method for preparing magnesium carbonate trihydrate whisker by ultrasonic wave
  • A kind of method for preparing magnesium carbonate trihydrate whisker by ultrasonic wave

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Embodiment 1

[0027] The technical scheme of this embodiment is as figure 1 shown, follow the steps below:

[0028] (1) Using water as a solvent, make magnesium chloride hexahydrate into a 0.5mol / L solution, and ammonium bicarbonate into a 1.0mol / L solution;

[0029] (2) After moving the prepared magnesium chloride hexahydrate solution into the reaction tank, add the ammonium bicarbonate solution into the magnesium chloride hexahydrate solution at 20°C, and stir at the same time, the stirring speed is 360r / min, and the addition is completed in 5 seconds to obtain mixed materials;

[0030] (3) Move the reaction tank containing the mixed material to the ultrasonic chemical reactor, and react for 20 minutes under the action of ultrasonic waves, collect the gas generated during the reaction to obtain CO 2 product;

[0031] (4) Centrifuge and dehydrate the reaction slurry in the reaction tank in a low-speed centrifuge to obtain solid matter and centrifugate; heat the centrifuge at 100°C for 6...

Embodiment 2

[0033] The technical scheme of this embodiment is as figure 1 shown, follow the steps below:

[0034] (1) Using water as a solvent, make magnesium chloride hexahydrate into a 0.75mol / L solution, and ammonium bicarbonate into a 1.5mol / L solution;

[0035] (2) After moving the prepared magnesium chloride hexahydrate solution into the reaction tank, add the ammonium bicarbonate solution into the magnesium chloride hexahydrate solution at 25°C, and stir at the same time. The stirring speed is 120~360r / min, and the addition is completed in 8 seconds. , to get the mixed material;

[0036] (3) Move the reaction tank containing the mixed material to the ultrasonic chemical reactor, and after reacting for 5 minutes under the action of ultrasonic waves, collect the gas generated during the reaction to obtain CO 2 product;

[0037] (4) Centrifuge and dehydrate the reaction slurry in the reaction tank in a low-speed centrifuge to obtain solid matter and centrifugate; heat the centrifug...

Embodiment 3

[0039] The technical scheme of this embodiment is as figure 1 shown, follow the steps below:

[0040] (1) Using water as a solvent, make magnesium chloride hexahydrate into a 1.0mol / L solution, and ammonium bicarbonate into a 2.0mol / L solution;

[0041] (2) After moving the prepared magnesium chloride hexahydrate solution into the reaction tank, add the ammonium bicarbonate solution into the magnesium chloride hexahydrate solution at 30°C, while stirring at the same time, the stirring speed is 120r / min, and the addition is completed in 10 seconds to obtain mixed materials;

[0042] (3) Move the reaction tank containing the mixed materials to the ultrasonic chemical reactor, and react for 15 minutes under the action of ultrasonic waves, collect the gas generated during the reaction to obtain CO 2 product;

[0043](4) Centrifuge and dehydrate the reaction slurry in the reaction tank in a low-speed centrifuge to obtain solid matter and centrifugate; heat the centrifuge at 120°...

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Abstract

The invention belongs to the field of mineral processing, in particular to a method for ultrasonically preparing magnesium carbonate trihydrate whiskers. In the present invention, the ammonium bicarbonate solution is added to the magnesium chloride hexahydrate solution at 20°C to 30°C, then moved to an ultrasonic chemical reactor, and reacted for 5 to 20 minutes under the action of ultrasonic waves, and then the reaction slurry is centrifuged and dehydrated to obtain a solid substance and centrifuge, the obtained solid matter was washed with deionized water several times, and then dried to obtain the magnesium carbonate trihydrate whisker product, the product length was 40-50 μm, the product diameter was 0.5-1.0 μm, and the aspect ratio was 60-80. In the present invention, ultrasonic waves are applied to the synthesis of magnesium carbonate microcrystals. Not only is the operation simple and fast, no heating is required, and the reaction speed is fast, but also because ultrasonic waves can eliminate the defects of reaction concentration gradients in the liquid phase reaction system, the reaction materials can be mixed evenly, and can affect The bonding energy between crystal nuclei during the crystal growth process can speed up the crystal growth rate and make the crystal synthesis effect better, showing obvious advantages.

Description

technical field [0001] The invention belongs to the field of mineral processing, in particular to a method for ultrasonically preparing magnesium carbonate trihydrate whiskers. Background technique [0002] Magnesium carbonate trihydrate whiskers are single crystals of magnesium carbonate with the chemical formula MgCO 3 ·3H 2 O, its surface is smooth, its physical and chemical properties are excellent, and its cost performance is high. Compared with ordinary basic magnesium carbonate, the whisker crystals of magnesium carbonate trihydrate are not only completely developed, but the whiskers are colorless and transparent, and the crystals contain fewer defects and have higher crystal strength. It can be used to prepare high-purity magnesium sulfate and magnesium hydroxide , basic magnesium carbonate, magnesium oxide, magnesium nitrate and other magnesium salt products; and can be directly used for reinforcement and modification of plastics, rubber, paints, inks, etc., and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/62C30B29/10C30B7/14
Inventor 闫平科高玉娟马云东张旭
Owner LIAONING TECHNICAL UNIVERSITY
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