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A kind of preparation method of spherical magnesium hydroxide

A technology of magnesium hydroxide and sodium hydroxide, applied in magnesium hydroxide and other directions, can solve the problems of application value and field limitations, small specific surface area of ​​magnesium hydroxide, uneven particle size, etc., and achieve high added value and less impurities. , the effect of uniform particle distribution

Active Publication Date: 2019-11-05
HEFEI ZHONGKE FLAME RETARDANT NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the whisker shape can be used as a fireproof material, with good mechanical properties, but it is not easy to mix evenly, and it is easy to appear "cooked" phenomenon
The spherical shape can be mixed evenly without the phenomenon of "crowding". However, the spherical magnesium hydroxide particles produced at present are large and small, with uneven particle size and poor particle regularity. In addition, there will be sticking together in the distribution. The distribution is also uneven, and the specific surface area of ​​the prepared magnesium hydroxide product is small. At the same time, the small particles of magnesium hydroxide make it difficult to filter and separate during use, which limits its application value and field

Method used

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  • A kind of preparation method of spherical magnesium hydroxide
  • A kind of preparation method of spherical magnesium hydroxide
  • A kind of preparation method of spherical magnesium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The magnesium sulfate heptahydrate solution 100ml of preparation 2mol / L is placed in the 500ml beaker, in the magnesium sulfate solution, add 45ml, the sodium citrate of 0.05mol / L, glycerin 20ml, open stirrer, setting stirring speed is 100r / min, in Under the condition of stirring, add 0.01mol / L sodium hydroxide solution dropwise at a rate of 10 drops / min, until the white precipitate just appears, continue to stir until the white emulsion disappears, and set aside; take another volume fraction of 25% 200ml of concentrated ammonia water, seal the ammonia water with a perforated plastic wrap, place it in a closed 2000ml container together with the above-mentioned prepared solution, and carry out the reaction. The reaction time is 42h, and the reaction temperature is 38°C. Filter after the reaction, wash the filter cake with 2000mL pure water for 8 times, check the washing solution with barium solution for no white precipitate, then wash with 200mL absolute ethanol for 3 tim...

Embodiment 2

[0028] The magnesium sulfate heptahydrate solution 100ml of preparation 1mol / L is placed in the 500ml beaker, in the magnesium sulfate solution, add 40ml, the sodium citrate of 0.05mol / L, glycerin 10ml, open stirrer, setting stirring speed is 80r / min, in Under the condition of stirring, add 0.01mol / L sodium hydroxide solution dropwise at a rate of 5d / min, and add dropwise until the white precipitate just appears, and continue to stir until the white emulsion disappears, and set aside; another volume fraction is 28% 200ml of concentrated ammonia water, seal the ammonia water with a perforated plastic wrap, place it in a closed 2000ml container together with the above-mentioned prepared solution, and carry out the reaction. The reaction time is 36h, and the reaction temperature is 50°C. After the reaction is finished, filter, wash the filter cake with 2000mL pure water for 10 times, check the washing liquid with barium solution for no white precipitate, then wash with 200mL absol...

Embodiment 3

[0031] The magnesium sulfate heptahydrate solution 100ml of preparation 4mol / L is placed in the 500ml beaker, in the magnesium sulfate solution, add 50ml, the sodium citrate of 0.05mol / L, glycerin 30ml, open stirrer, setting stirring speed is 120r / min, in Under the condition of stirring, add 0.01mol / L sodium hydroxide solution dropwise at a rate of 8 drops / min, until the white precipitate just appears, and continue to stir until the white emulsion disappears, then set aside; take another volume fraction of 26% 200ml of concentrated ammonia water, seal the ammonia water with a perforated plastic wrap, place it in a closed 2000ml container together with the above-mentioned prepared solution, and carry out the reaction. The reaction time is 48h, and the reaction temperature is 20°C. Filter after the reaction, wash the filter cake 8 times with 2000mL pure water, check the washing liquid with barium solution for no white precipitate, then wash with 200mL absolute ethanol for 5 times...

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Abstract

The invention discloses spherical magnesium hydroxide. Magnesium sulfate heptahydrate, a template agent and stronger ammonia water are put in a beaker, the ammonia water is sealed with a preservativefilm with holes, the obtained solution and the ammonia water are subjected to a reaction in an airtight container, washing and drying are performed after the reaction ends, and spherical magnesium hydroxide is obtained. The technological process of the product is simple, the production process is environmentally friendly and pollution-free, the particle size is proper, the product in the intermediate state is easy to separate before washing, the finished product has large specific surface area and high adsorption capacity, is green and environmentally friendly, does not cause secondary pollution and has uniform particle size and regular morphology, aggregation of small spherical particles is avoided, the particle size is about 5-8 mu m, uniform mixing can be realized in the mixing processwith related materials, no underdone phenomenon exists, meanwhile, the mechanical effect between magnesium hydroxide and the related materials is enhanced by means of the microporous structure of magnesium hydroxide, and the product has the purity of 99.1% or above and contains few impurities. The product can still keep uniform distribution of particles after being stored for 30 days. The method adopts a simple technological process and is low in production cost, high in additional value of products and easy to popularize and use.

Description

technical field [0001] The invention relates to a preparation method of spherical magnesium hydroxide. Background technique [0002] Magnesium hydroxide is an important chemical raw material, widely used in wastewater purification treatment, material additives and other fields. The application value and field of magnesium hydroxide are closely related to its morphology. At present, there are many kinds of magnesium hydroxide prepared, including fibrous whiskers, spherical, and lamellar products. Among them, the whisker shape can be used as a fireproof material, with good mechanical properties, but it is not easy to mix evenly, and it is prone to "cooking" phenomenon. The spherical shape can be mixed evenly without the phenomenon of "crowding". However, the spherical magnesium hydroxide particles produced at present are large and small, with uneven particle size and poor particle regularity. In addition, there will be sticking together in the distribution. The distribution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/20
Inventor 蒋德敏陈书鸿陈星谢永生黄承桃冯华超陈靖宇
Owner HEFEI ZHONGKE FLAME RETARDANT NEW MATERIAL