Process for preparing super-thin high-purity magnesium hydroxide fire retardant by supergravity-hydrothermal method

A technology of magnesium hydroxide and hydrothermal method, applied in magnesium hydroxide, chemical instruments and methods, dyeing of low molecular weight organic compounds, etc., can solve the problems of low purity and poor dispersibility, and achieve high purity, lasting effect and environmental protection. Superior performance

Inactive Publication Date: 2011-04-27
天津长芦汉沽盐场有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purity of high-grade magnesium hydroxide flame retardant products produced by domestic manufacturers is generally lower than 96%, and the dispersion of products with a particle size of 2-3um is poor

Method used

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  • Process for preparing super-thin high-purity magnesium hydroxide fire retardant by supergravity-hydrothermal method
  • Process for preparing super-thin high-purity magnesium hydroxide fire retardant by supergravity-hydrothermal method
  • Process for preparing super-thin high-purity magnesium hydroxide fire retardant by supergravity-hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] like figure 1 — Figure 9 Shown:

[0041] ⑴. Brine (magnesium chloride solution) refining process:

[0042] The old brine after salt production contains magnesium chloride M 1 =419.53g / L(kg / m 3 ) Wave Magnesium: 35.00 o Be?, PH=4.3. Take 3.0 m 3 The old brine is sent to the brine mixing tank by the brine pump, and 30 liters of 30% sodium hypochlorite solution is added to the brine mixing tank, and stirred for 1.5 hours to decolorize the brine. Then add 35 liters of 10% sodium hydroxide solution to adjust the pH value of the brine to 6.8, use a pump to send it into a filter with a precision of 1 μm to remove impurities in the brine, add the filtered brine to the refined brine storage tank, and analyze the content of magnesium chloride 410.3 g / L (kg / m 3 ), take 2.6 m 3 Filtered brine, add 1.4 m 3 The process water is prepared with a magnesium chloride concentration of 2.8M / l, 4.0 m 3 spare.

[0043] ⑵. Alkaline refining:

[0044] The concentration of the pur...

Embodiment 2

[0067] Embodiment 2: The difference with Embodiment 1 is as follows, as figure 1 , Figure 10 Shown:

[0068] Hypergravity and hydrothermal reaction: the reaction temperature is 70°C, and the reaction time is 60 minutes. The water heating time is 8 hours, PH=13.5 and the water heating temperature is 200°C. The appearance of gained magnesium hydroxide flame retardant product is as follows Figure 10 The electron microscope photo shown, SBET=5.2012m 2 / g, average particle size 0.75μm.

[0069] Other steps and advantages are the same as in Embodiment 1.

Embodiment 3

[0070] Embodiment 3: The difference with Embodiment 1 is as follows, as figure 1 , Figure 11 Shown:

[0071] Hypergravity and hydrothermal reaction: reaction temperature 40°C, reaction time 30min. The water heating time is 8 hours, PH=13.5 and the water heating temperature is 200°C. The appearance of gained magnesium hydroxide flame retardant product is as follows Figure 11 The electron microscope photo shown, SBET=7.4273m 2 / g, the average particle size is 0.43 μm.

[0072] Other steps and advantages are the same as in Embodiment 1.

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Abstract

The invention relates to a process for preparing a super-thin high-purity magnesium hydroxide fire retardant by a supergravity-hydrothermal method, which comprises the following steps of: performing precipitation on de-colored and refined aged brine and aqueous alkali in a supergravity reactor; allowing a reaction product to enter a hydrothermal reactor and heating the reaction product; filtering and washing discharged materials to obtain a magnesium hydroxide filter cake; obtaining a magnesium hydroxide product with a moisture content of less than 0.2 percent by two steps of drying; and performing dry-process modification on magnesium hydroxide powder, which is to pour materials into a high-speed stirrer, heat and pour titanate or a silicane modifier for surface treatment. The process fully uses the magnesium resources of the aged brine and is favorable for prolonging the product chain of sea salts and salty lake resources; the waste water of the process is sodium chloride brine which can be recycled, the production process is environmentally-friendly and contributes to the purification of oceans; the organic fire retardant grain is super-thin, is 0.4 to 0.8 mu m wide, high in purity and low in price, has the fire-retardant and filling functions, generates no corrosive or toxic gases in a fire retarding process and is highly environmentally-friendly.

Description

technical field [0001] The invention relates to a preparation process of magnesium hydroxide, in particular to a process for preparing superfine high-purity magnesium hydroxide flame retardant by using salt field brine or bischofite as raw materials by a high-gravity-hydrothermal method. Background technique [0002] my country is the second largest salt-producing country in the world, and discharges about 15 million cubic meters of salt-making mother liquor (bitrine) every year 3 , the discharged bittern contains 1.1 million tons of magnesium sulfate and 2.5 million tons of magnesium chloride resources. Because the process of extracting magnesium salt from bittern requires a large amount of energy, and at the same time, the market price of the extracted products magnesium sulfate and magnesium chloride is low, so a large amount of bittern resources in our country are discharged into the sea and discarded. Not only caused a waste of resources, but also polluted the oc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/06C01F5/22
Inventor 宋云华刘立平陈建铭任杰
Owner 天津长芦汉沽盐场有限责任公司
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