Preparation technology of hexagonal plate magnesium hydroxide

A technology of magnesium hydroxide and hexagonal flakes, applied in the direction of magnesium hydroxide, etc., can solve the problems of expensive lithium hydroxide and higher cost of magnesium hydroxide modification, etc., and achieve improved mechanical strength, improved flame retardancy, and uniform particle size Effect

Inactive Publication Date: 2009-09-30
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

Because lithium hydroxide is relatively expensive, the modifi

Method used

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  • Preparation technology of hexagonal plate magnesium hydroxide

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Embodiment Construction

[0047] (1) Magnesium chloride in the Salt Lake area of ​​Qinghai is used as a raw material, and common magnesium hydroxide products are obtained through a general ammonia reaction. The moisture content is 56.12%.

[0048] (2) the above-mentioned magnesium hydroxide finished product is mixed with the slurry that mass concentration is 15%, joins in the compound transforming agent solution of lithium hydroxide and sodium hydroxide (the mole of lithium hydroxide and sodium hydroxide in the compound transforming agent solution The ratio is 1:4, the total alkali concentration of the conversion agent solution is 2mol / L), and the mixture is stirred evenly.

[0049] (3) Put it into a high-pressure reactor and react at a temperature of 140° C. for 4 hours; the reaction product is cooled, filtered, washed with water, dried and pulverized to obtain hexagonal flaky magnesium hydroxide. The yield is 98.79%.

[0050] Scanned by a laser electron scanning microscope, the product is a regular...

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Abstract

The invention provides a preparation technology of hexagonal plate magnesium hydroxide. Magnesium hydroxide products are prepared into slurry mass concentration of which is 7.5 percent to 15 percent, the slurry is added into transforming agent solution to enable the total alkali concentration of the transforming agent solution to be 2-4mol/L; then all the mixture is mixed uniformly and placed in a high-pressure reaction kettle to react at 140-160 DEG C for 2-6h; and after being cooled, the reaction product is washed by water, dried and crashed to obtain the hexagonal plate magnesium hydroxide. The transforming agent is a composite transforming agent formed by mixing lithium hydroxide and sodium hydroxide or potassium hydroxide according to mol ratio of 1:1-1:4. Observed by a low vacuum laser scanning electron microscope, the magnesium hydroxide prepared in the invention is a hexagonal plate magnesium hydroxide with complete crystal formation and uniform granularity; the grain diameter of the magnesium hydroxide is correlative to raw materials; and the specific surface of the magnesium hydroxide is 3.0-20 m<2>/g. Due to the adoption of the new transforming agent, the invention has high transformation ratio, good product quality, stable crystal formation and low cost.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry and relates to a preparation process of magnesium hydroxide, in particular to a process of converting ordinary magnesium hydroxide into hexagonal flaky magnesium hydroxide by using a hydrothermal method. Background technique [0002] In recent years, with the continuous development of the material industry, especially polymer materials have become more and more common in people's daily life, people have higher and higher requirements for the fire performance of these materials. Magnesium hydroxide, as a new type of inorganic flame retardant with high efficiency, superiority and environmental protection, has been paid more and more attention by people. The appearance of magnesium hydroxide is white powder, which is non-toxic, tasteless and non-corrosive. It decomposes into magnesium oxide and water when heated. It can be widely used in polyvinyl chloride, polyethylene, high imp...

Claims

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Application Information

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IPC IPC(8): C01F5/14
Inventor 陈大福李丽娟聂锋张志宏戈桦李和印梁天曙王海军胡守招
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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