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A method for preparing highly dispersed magnesium hydroxide using agglomerated magnesium hydroxide as raw material

A high-dispersion technology of magnesium hydroxide, applied in the direction of magnesium hydroxide, etc., can solve the problems of restricting industrial application and harsh conditions, and achieve the effect of high added value, regular shape and good dispersion of products

Active Publication Date: 2017-02-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Agglomerated magnesium hydroxide is difficult to disperse by conventional methods because the initial particles are generally connected in a hard agglomeration mode, and it needs to be dispersed at high temperature and high alkali (200 o C, 12-20wt% sodium hydroxide) under hydrothermal conditions for more than 3-4 hours (Li Zhenzhong, Liu Jingbing, He Wei, Zhang Wenxiong, the performance of high-temperature precipitation-hydrothermal preparation of nano-magnesium hydroxide, Progress in Chemical Industry, 2006, ( 11):1332-1335; Sun Yu, Gao Enshuang, Pan Xujie, Zong Jun, Synthesis of highly dispersed and easy-filtering high flame-retardant magnesium hydroxide by hydrothermal method, Inorganic Salt Industry, 2013, (04):29-30+37), The hard agglomeration is broken by high temperature and high alkali enhanced dissolution and crystallization, and the well-dispersed magnesium hydroxide product is prepared. Due to the harsh conditions, the industrial application of the above method is limited.

Method used

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  • A method for preparing highly dispersed magnesium hydroxide using agglomerated magnesium hydroxide as raw material
  • A method for preparing highly dispersed magnesium hydroxide using agglomerated magnesium hydroxide as raw material
  • A method for preparing highly dispersed magnesium hydroxide using agglomerated magnesium hydroxide as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 100 grams of agglomerated magnesium hydroxide raw material (main content 95wt%, average primary particle size 0.1 micron, average agglomerated particle size 50 microns) and 1 gram of sodium oxalate, mix and place in an alumina crucible, heat up (1°C / min ) to 300°C for 6 hours at a constant temperature to obtain dispersed ultrafine activated magnesia; add dispersed ultrafine activated magnesia to an aqueous solution containing 0.01wt% sodium lauryl sulfate to make a solid content rate of 0.5wt% Suspension, hydration conversion at 10°C and stirring (50 rpm) for 0.5 hours, filtered, washed, and dried (80°C, hour), to obtain an average primary particle size of 0.1 microns, an average aggregated particle size of 0.5 microns, and a main content of Up to 95wt% highly dispersed magnesium hydroxide product.

Embodiment 2

[0026]Take by weighing 100 grams of agglomerated magnesium hydroxide raw material (main content 99.5wt%, average primary particle size 3 microns, average agglomerated particle size 50 microns) and 30 grams of magnesium oxalate, mix and place alumina crucible, heat up (50 ℃ / Point) to 700 DEG C, constant temperature reaction 0.5 hour, obtain dispersed superfine activated magnesia; Add dispersed superfine activated magnesia to the aqueous solution containing 20wt% sodium dodecylbenzenesulfonate and 20wt% sodium hydroxide, prepare Become a suspension with a solid content rate of 40wt%, hydration conversion at 100°C and stirring (800 rpm) for 6 hours, filter, wash, and dry (110°C, 6 hours) to obtain an average primary particle size of 2 microns, the average A highly dispersed magnesium hydroxide product with an aggregate particle size of 4 microns and a main content of 99.8 wt%.

Embodiment 3

[0028] Weigh 100 grams of agglomerated magnesium hydroxide raw material (main content 98.5wt%, average primary particle diameter 1.5 microns, average aggregated particle diameter 25 microns), 15 grams of ammonium oxalate and 1 gram of sodium chloride, mix and place in an alumina crucible , heating up (15 DEG C / min) to 550 DEG C and then reacting at a constant temperature for 5 hours to obtain dispersed ultrafine activated magnesium oxide; The aqueous solution is made into a suspension with a solid content rate of 10wt%, hydrated at 40°C and stirred (450 rpm) for 1 hour, filtered, washed, and dried (105°C, 2 hours) to obtain the average primary particle size Highly dispersed magnesium hydroxide product with 1.8 microns, average agglomerated particle size of 3 microns, and main content of 97.7 wt%.

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Abstract

The invention relates to a method for preparing high dispersed magnesium hydroxide from agglomerated state magnesium hydroxide, and belongs to the technical field of the preparation of inorganic chemical industry materials. According to the method disclosed by the invention, the high dispersed magnesium hydroxide is prepared through the following steps: using agglomerated state magnesium hydroxide as a raw material, wherein the original average particle diameter is 0.1-3 microns, and the average agglomerated particle diameter is 5-50 microns, firstly, mixing the raw material with proper amount of inorganic solvent, and roasting the mixture for 0.5-6 hours at the temperature of 300-700 DEG C, so as to form dispersed superfine active magnesium oxide; then, adding the magnesia to an aqueous solution containing a dispersing agent and a morphological control agent, and performing hydration conversion for 0.5-6 hours at the temperature of 10-100 DEG C so as to obtain the high dispersed magnesium hydroxide of which the original average particle diameter is 0.1-3 microns, the average agglomerated particle diameter is 0.5-4.0 microns, the morphology is regular, and the particle diameters are homogeneous. The method disclosed by the invention is simple in technology, is mild in process, and is high in added value of a product. The magnesium hydroxide prepared by the method disclosed by the invention is regular in morphology and is good in dispersion, can be used as a basic inorganic chemical industry product to be used in the fields of flame resistance, foods, desulphurization, wastewater treatment and the like.

Description

technical field [0001] The invention relates to a preparation method of highly crystalline and highly dispersed magnesium hydroxide, which belongs to the technical field of preparation of inorganic chemical materials. Background technique [0002] my country is a country with abundant magnesium resources in salt lakes, but limited by technical and economic conditions, magnesium resources in salt lakes are still in the primary development stage, mainly primary products such as magnesium chloride, magnesium sulfate, magnesium oxide, and ordinary magnesium hydroxide, and the development of high value-added magnesium salt products is still in progress. In its infancy. [0003] Highly dispersed magnesium hydroxide, as a basic inorganic chemical product, has been widely used in flame retardant, food, desulfurization and wastewater treatment, and its research and development is becoming a hot spot at home and abroad. There are many methods for preparing magnesium hydroxide, such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/14
CPCC01F5/14
Inventor 向兰易美桂张军平马祥伟
Owner TSINGHUA UNIV
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