Method for preparing brucite or sintered magnesia ultrafine powder by wet method
A technology for sintering magnesium oxide and brucite powder, applied in the directions of magnesium oxide, magnesium hydroxide, etc., can solve the problems of high solid content in filtrate, low filtrate yield, improper selection of filter media and filtration.
Inactive Publication Date: 2006-08-02
大连市中山区鑫阳矿业化工研究所
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Problems solved by technology
However, there are still some deficiencies in this patented technology: such a long crushing time needs to further improve its efficiency; although the dried filter cake is very fragile, and the production requires ultra-fine powder, there must be a crushing process in the process. It is necessary to equip even the simplest crushing (or crushing) equipment; the most difficult technical problem is the filtration during liquid-solid separation: improper selection of filter media or difficulty in filtration, and the required time is too long; or the filtrate contains High solid content, there are defects that the filtrate needs to be processed and the yield is not high
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Embodiment Construction
[0009] The present invention will be further described below with 10 examples.
[0010] Each embodiment carries out the wet pulverization of 1h with 1000kg brucite powder (or sintered magnesia powder) and corresponding amount of pulverization aid, modifier, water, and the slurry all has good fluidity, and then the slurry directly Dry to obtain a powdery product. The product is hydrophobic and can float in water. The average particle size of the product is measured by a particle size meter. Example data are as follows:
[0011]
[0012] Note: ※The raw material is sintered magnesium oxide powder, fineness ≥ 100 mesh, and the rest of the raw materials are brucite powder, fineness ≥ 200 mesh.
[0013] Among the additives, polyacrylic acid or its salt is polyacrylic acid sodium salt with a molecular weight of 1500-4500; sulfonic acid or its salt is dodecylbenzenesulfonic acid sodium salt; polyether phosphate is nonylphenol polyether phosphate (PNP ——10).
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The material including brucite powder or sintered magnesia powder of fineness over 100 mesh in 1000 weight portions, polyacrylic acid or its salt of molecular weight 1500-4500, alkylbenzene sulfonic acid or its salt, or polyether phosphate in 10-80 weight portions, fatty acid or its salt, organic phosphate or phosphate in 5-70 weight portions, and water in 600-2000 weight portions are crushed in a mill at 50-90 deg.c for 1 hr to obtain milk-like slurry with no coagulation and adhesion; and the slurry is dried directly to obtain powdered product of average granularity smaller than 5 micron. The product is hydrophobic and can float on water. The present invention has high crushing efficiency, simple technological process and superfine product powder of high quality.
Description
technical field [0001] What the present invention relates to is the crushing technology of magnesium hydroxide and magnesium oxide. Background technique [0002] The wide application of flame retardants in polymer materials has promoted its substantial growth, especially in the manufacture of polymer materials for electronic or electrical products, flame retardants are the most important additives. In the 1990s, the main flame retardants were phosphoric acid esters, antimony oxides, and brominated aromatic hydrocarbons (such as hexabromobenzene, decabromodiphenyl ether, pentabromotoluene, etc.), among which brominated diphenyl ethers were widely used. Variety. Although antimony oxide and some bromides can play a flame-retardant role when burned at high temperature, the gas and decomposition products produced have problems such as toxicity to the human body and pollution to the environment, which stimulates the development of new flame retardants. develop. The development ...
Claims
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IPC IPC(8): C01F5/02C01F5/14
Inventor 张有俊胡月阳陈国庆
Owner 大连市中山区鑫阳矿业化工研究所