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Manufacturing method of high purity calcium carbonate for electron industry

A technology of electronic industry and manufacturing method, which is applied in the field of manufacturing high-purity calcium carbonate for electronic industry, can solve the problems of complex process and high cost, and achieve the effect of high purity and low heavy metal impurities

Inactive Publication Date: 2006-09-13
胡志彤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the process is complicated and the cost is high

Method used

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  • Manufacturing method of high purity calcium carbonate for electron industry

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Effect test

Embodiment 1

[0059] Calcium nitrate Ca(NO 3 ) 2 and sodium carbonate Na 2 CO 3 As raw material, Ca(NO 3 ) 2 Remove impurities and decolorize twice at pH10 and pH12; Na 2 CO 3 Remove impurities and decolorize once at pH 12; synthetic reaction of two raw materials, temperature 40--45°C, 35 minutes, after standing for 20 minutes, stir for 5 minutes, centrifuge and dehydrate, wash with purified water at 50°C±10°C until there is no chloride ion , 130-140 ℃ drying to get the finished product.

Embodiment 2

[0061] Calcium Chloride CaCl 2 and sodium carbonate Na 2 CO 3 As raw material, CaCl 2 At pH9, pH12, and pH14, precipitate for three times to remove impurities and decolorize; Na 2 CO 3 Precipitate at pH 14 to remove impurities and decolorize once; synthesis reaction of two raw materials, temperature 25--35°C, 30 minutes, stirring for 25 minutes, after centrifugation and dehydration, wash with purified water at 70±10°C until there is no chloride ion, 130--140°C Dried to get the finished product.

Embodiment 3

[0063] Calcium Chloride CaCl 2 with ammonium bicarbonate NH 4 HCO 3 For the raw material. CaCl 2 Add hydrogen peroxide at pH 6; pH 9, pH 12, and pH 14 for three precipitations to remove impurities and decolorize; add thioacetamide at pH 10 to remove heavy metal impurities. NH 4 HCO 3 At pH9, pH12 twice to remove impurities and decolorize. The two solutions were reacted at 35-040°C for 25 minutes, left to stand for 20 minutes, stirred for 5 minutes, the resultant was washed with warm water at 50±10°C until free of chloride ions, and dried at 120-130°C to obtain the finished product.

[0064] serial number

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Abstract

A process for preparing high-purity calcium carbonate used as insulating filler and crystal grain fining agent in electronic industry includes such steps as providing Ca-contained compound and SO4 radical contained compound, multi-step depositing for removing impurities, synthesizing reaction to generate deposit, washing and drying.

Description

technical field [0001] The invention relates to a method for preparing high-purity inorganic products by using inorganic chemical raw materials, in particular to a method for producing high-purity calcium carbonate for electronic industry. Background technique [0002] Calcium carbonate itself is an excellent electrical insulating material, often used as a filler in cables, wires, sealants, and building materials and plastics; high-purity calcium carbonate has extremely low impurities such as iron, magnesium, barium, arsenic, mercury, and lead At the same time, it can also be used as a filler in the electronics industry, which can increase the insulation performance of high-tech electronic products; calcium carbonate can be made into particles of different thicknesses during the production process, and used as a grain refiner in the production of electronic ceramics. Therefore, high-purity calcium carbonate with a certain particle size can be used to adjust the particle size...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 胡志彤
Owner 胡志彤
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