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A method for co-producing low-sodium high-temperature alumina by polyaluminum chloride

A technology of polyaluminum chloride and high-temperature alumina, which is applied in the field of light metal metallurgy, can solve problems such as pollution and high cost, and achieve low sodium content and environmental protection in the preparation process

Active Publication Date: 2022-04-26
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a method for co-producing low-sodium high-temperature alumina by polyaluminum chloride to solve the problems of high cost and serious pollution in the prior art for preparing low-sodium alumina

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  • A method for co-producing low-sodium high-temperature alumina by polyaluminum chloride
  • A method for co-producing low-sodium high-temperature alumina by polyaluminum chloride
  • A method for co-producing low-sodium high-temperature alumina by polyaluminum chloride

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Embodiment 1

[0056] Embodiment 1 provides a method for polyaluminum chloride to co-produce low-sodium high-temperature alumina, comprising:

[0057] S1, mixing aluminum hydroxide solution and hydrochloric acid solution, wherein the ratio of the amount of hydrochloric acid to aluminum hydroxide is 2, the stripping reaction is carried out at a temperature of 85°C and a pressure of 0.25MPa, and the stripping time is 2.3h. A solution of polyaluminum chloride was obtained.

[0058] S2, mixing alumina with a particle size of 20-80 μm and the polyaluminum chloride solution with a specific gravity of 1.26 g / ml obtained in step S1, wherein the weight ratio of the polyaluminum chloride solution to alumina is 3, and deoxidizing at 90°C Alkali-polymerization reaction, dealkalization-polymerization reaction time is 2h, and a mixed solution is obtained.

[0059] S3, filtering the mixed solution to obtain a filter cake and a filtrate.

[0060] S4, roasting the filter cake obtained in step S3 at a tempe...

Embodiment 2

[0063] Embodiment 2 provides a method for polyaluminum chloride to co-produce low-sodium high-temperature alumina, comprising:

[0064] S1, mixing aluminum hydroxide solution and hydrochloric acid solution, wherein the ratio of the amount of hydrochloric acid to aluminum hydroxide is 3, the dissolution reaction is carried out at a temperature of 130°C and a pressure of 0.15MPa, and the dissolution time is 1h, to obtain polyaluminum chloride solution.

[0065] S2, mixing alumina with a particle size of 60-100 μm and the polyaluminum chloride solution with a specific gravity of 1.18 g / ml obtained in step S1, wherein the weight ratio of the polyaluminum chloride solution to alumina is 12, and the process is carried out at a temperature of 103°C dealkalization-polymerization reaction, the dealkalization-polymerization reaction time is 3 hours, and a mixed solution is obtained.

[0066] S3, filtering the mixed solution to obtain a filter cake and a filtrate.

[0067] S4, roasting...

Embodiment 3

[0070] Embodiment 3 provides a method for polyaluminum chloride to co-produce low-sodium high-temperature alumina, the method comprising:

[0071] S1, mixing aluminum hydroxide solution and hydrochloric acid solution, wherein the substance ratio of hydrochloric acid to aluminum hydroxide is 0.8, performing stripping reaction at a temperature of 155° C. and a pressure of 0.45 MPa to obtain a polyaluminum chloride solution.

[0072] S2, mixing alumina with a particle size of 60-90 μm and a polyaluminum chloride solution with a specific gravity of 1.25 g / ml, wherein the weight ratio of the polyaluminum chloride solution to alumina is 8, and dealkalization is carried out at a temperature of 40°C - Polymerization reaction, dealkalization - The polymerization reaction time is 1 h, and a mixed solution is obtained.

[0073] S3, filtering the mixed solution to obtain a filter cake and a filtrate.

[0074] S4, roasting the filter cake at a temperature of 1305° C. to obtain low-sodium ...

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Abstract

The invention discloses a method for co-producing low-sodium high-temperature alumina with polyaluminum chloride. The method comprises: mixing an aluminum hydroxide solution and a hydrochloric acid solution, and performing a stripping reaction to obtain a polyaluminum chloride solution; After mixing with the polyaluminum chloride solution, carry out a dealkalization-polymerization reaction to obtain a mixed solution; filter the mixed solution to obtain a filter cake and a filtrate; roast the filter cake to obtain low-sodium high-temperature alumina, and The filtrate is concentrated to obtain polyaluminum chloride. By adopting the method of the invention, the preparation raw material is cheap, and the preparation process is environment-friendly, and not only alumina with extremely low sodium content is obtained, but also high-purity polyaluminium chloride, which can be used as a water purifying agent.

Description

technical field [0001] The invention belongs to the field of light metal metallurgy, and in particular relates to a method for co-producing low-sodium high-temperature alumina by polyaluminum chloride. Background technique [0002] Polyaluminum chloride, also called PAC, is an inorganic polymer coagulant, which is between AlCl 3 and Al(OH) 3 A water-soluble inorganic high molecular polymer, which has a high degree of neutralization and bridging effect on colloids and particles in water. Its synthesis methods include metal aluminum method, activated aluminum hydroxide method, aluminum oxide method, aluminum chloride method and alkali solution method. [0003] Low-sodium alumina is a white inorganic powder material, which has the advantages of low Na content, narrow particle size distribution, large specific surface area, high whiteness, low hardness, low refractive index, and good compatibility with organic high-resolution materials. Used in the polishing of metal, glass a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/57C01F7/46
CPCC01F7/56C01F7/46C01P2006/10
Inventor 高建阳王少武陈玉海袁崇良纪蒙刁克建李颍郑霞岳巍姚毅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND