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Method for preparing magnesium hydroxide fire retardant with lithium carbonate by-product magnesium oxide slag

A technology of magnesium hydroxide and magnesium oxide, applied in the chemical field, can solve the problems of no recycling, environmental pollution, etc., and achieve the effect of reducing pollution

Inactive Publication Date: 2012-04-11
CHTC HELON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component is magnesium oxide, and the others are impurities such as magnesium borate and acid insoluble matter. Currently, it is generally treated as production waste residue without recycling, causing environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1, a method for preparing magnesium hydroxide flame retardant with lithium carbonate by-product magnesium oxide slag, the magnesium oxide slag undergoes impurity removal, grinding, sieving, hydration reaction, filtration, washing, drying, and surface modification procedures, Obtain magnesium hydroxide flame retardant;

[0026] a. The impurity removal process is as follows: first, add tap water to the blending tank, then throw in 100g of magnesia slag and stir to obtain a slurry, the concentration of magnesia is 20% by weight, and the slurry passes through an overflow tank and a solid-liquid cyclone separator Perform rinsing and cyclone separation to remove floating impurities and acid-insoluble particles in the slurry;

[0027] b. The grinding and sieving process is as follows: grind the slurry after the initial impurity removal with a grinding and stripping machine, and then pass through the slurry sieving process to remove sand and sintered magnesia, and the p...

Embodiment 2

[0036]Example 2, a method for preparing magnesium hydroxide flame retardant with magnesium oxide slag, a by-product of lithium carbonate, after impurity removal, grinding, sieving, hydration reaction, filtration, washing, drying, and surface modification procedures, Obtain magnesium hydroxide flame retardant;

[0037] a. The impurity removal process is as follows: first, add tap water to the blending tank, then throw in 100g of magnesia slag and stir to obtain a slurry, the concentration of magnesia is 23% by weight, and the slurry passes through an overflow tank and a solid-liquid cyclone separator Perform rinsing and cyclone separation to remove floating impurities and acid-insoluble particles in the slurry;

[0038] b. The grinding and sieving process is as follows: grind the slurry after the initial impurity removal with a grinding and stripping machine, and then pass through the slurry sieving process to remove sand and sintered magnesia, and the particle size of the slur...

Embodiment 3

[0046] Example 3, a method for preparing magnesium hydroxide flame retardant with lithium carbonate by-product magnesium oxide slag, the magnesium oxide slag undergoes impurity removal, grinding, sieving, hydration reaction, filtration, washing, drying, and surface modification processes, Obtain magnesium hydroxide flame retardant;

[0047] a. The impurity removal process is as follows: first, add tap water to the blending tank, then throw in 100g of magnesia slag and stir to obtain a slurry, the concentration of magnesia is 26% by weight, and the slurry passes through an overflow tank and a solid-liquid cyclone separator Perform rinsing and cyclone separation to remove floating impurities and acid-insoluble particles in the slurry;

[0048] b. The grinding and sieving process is as follows: grind the slurry after the initial impurity removal with a grinding and stripping machine, and then pass through the slurry sieving process to remove sand and sintered magnesia, and the pa...

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Abstract

The invention relates to a method for preparing a magnesium hydroxide fire retardant with a lithium carbonate by-product magnesium oxide slag. Magnesium oxide slag is subjected to the procedures of impurity removal, grinding, screening, hydration, filtering, washing, drying and surface modification so as to obtain a magnesium hydroxide fire retardant, and waste residue generated from impurity removal can be crushed again and used as a raw material. The whole production process realizes zero discharge and reduces environmental pollution. Chemical bonding between a silane coupling agent and magnesium hydroxide generates the magnesium hydroxide fire retardant with weak surface polarity and good dispersibility. The inorganic terminal of the silane coupling agent is firstly hydrolyzed to form silanol which then reacts with the hydroxy on the filler surface. And the organic group at the other terminal of the coupling agent reacts with resin so as to form firm chemical combination. Thus, hydrophilic and oleophobic surface properties of magnesium hydroxide can be changed, the surface polarity of magnesium hydroxide is reduced, and the dispersibility as well as compatibility of magnesium hydroxide in a polymeric matrix can be improved. Therefore, the mechanical property of magnesium hydroxide in polymer product processing can be enhanced.

Description

technical field [0001] The invention relates to a preparation method of a magnesium hydroxide flame retardant, in particular to a preparation method of a magnesium hydroxide flame retardant by using magnesium oxide slag, a by-product of lithium carbonate, and belongs to the field of chemical technology. Background technique [0002] Magnesium hydroxide powder material, as an inorganic, smoke-suppressing, non-toxic flame retardant, is widely used in the field of high polymer flame retardant, suitable for high Flame Retardancy and Smoke Suppression of Molecular Materials. It has the characteristics of good thermal stability, non-toxic, non-volatile, no corrosive gas, less smoke, no secondary pollution, etc. It is the main variety of low-smoke and halogen-free flame retardant system. [0003] With the rapid development of industrial applications of polymer materials and higher and higher requirements for environmental protection, the market has more and more requirements for i...

Claims

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Application Information

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IPC IPC(8): C01F5/22C09K21/02
Inventor 逄奉建王海泉张文增刘建华姜明亮王东郝连庆吴亚红卢海蛟
Owner CHTC HELON
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