Liquid amonia pressurized precipitation and hydrothermal modification process for preparing magnesium hydroxide fire retardant

A magnesium hydroxide and hydrothermal modification technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of low ammonia utilization rate, large amount of waste water, and harsh working environment, so as to increase ammonia concentration, reduce water consumption, and have no environmental pollution Effect
CN1740269AInactive Publication Date: 2006-03-01TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2006-03-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention belongs to the field of inorganic chemical technology, and proposes one kind of liquid ammonia pressurized precipitation and hydrothermal modification process for preparing magnesium hydroxide fire retardant. Through the first precipitation reaction of magnesium chloride material with liquid ammonia as precipitant at 15-90 deg.c and sealed and pressurized conditions to synthesize magnesium hydroxide, and the subsequent modification of the normal temperature synthesized magnesium hydroxide at 100-250 deg.c in the presence of dispersant of 0.01-0.1 % for 1-6 hr, magnesium hydroxide fire retardant is prepared, which has primary granularity of 0.3-2.0 micron, average coagulation particle size of 1.0-4.0 micron, specific surface area of 5-30 sq m / g, and magnesium hydroxide content over 98 %. The magnesium hydroxide fire retardant may be used in rubber, plastic, building material, etc.
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Description

technical field

[0001] This patent relates to a new process for preparing magnesium hydroxide flame retardant, which belongs to the technical field of inorganic chemical industry. Background technique

[0002] my country is a country with large sea and lake salt resources, mainly distributed in Qinghai, Inner Mongolia, Xinjiang, Tibet, Shanxi and other provinces and coastal areas (such as Tianjin, Dalian, Shandong, etc.). Magnesium in sea and lake salt is the resource second only to sodium in reserves. For a long time, limited by technical and economic conditions, the utilization of sea and lake salt resources has mainly focused on salt production or potassium extraction, and insufficient attention has been paid to the comprehensive utilization of by-product magnesium salt. At present, only a very small part of magnesium salt is used to produce primary products such as magnesium chloride hexahydrate (100-300 yuan / ton) and magnesium sulfate heptahydrate (500-600 yuan / ton), w...

Claims

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