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High-purity ammonium aluminum carbonate hydroxide as precursor of high-purity easy-sintering aluminum oxide ceramic powder and preparation process thereof

A technology for sintering alumina and ammonium aluminum carbonate, which is applied in the direction of inorganic chemistry, aluminum compounds, chemical instruments and methods, etc., can solve the problems of large energy consumption, and achieve the advantages of saving consumption, eliminating environmental pollution, easy and economical recycling Effect

Inactive Publication Date: 2012-05-23
JIAZUO HONGCHENG ADVANCED CERAMIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In both domestic and foreign production, the two materials are heated and dissolved, and the two materials and reactants are kept in balance under heat preservation to maintain the reaction temperature, which consumes a lot of energy.

Method used

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Examples

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Effect test

Embodiment approach 1

[0023] A precursor of high-purity and easy-to-sinter alumina ceramic powder - high-purity ammonium aluminum carbonate is based on 943kg crystalline solid ammonium bicarbonate and 1320kg crystalline solid ammonium aluminum sulfate as raw materials. The above two components After chemical reaction synthesis, it becomes a precursor - high-purity ammonium aluminum carbonate; among them, crystalline α-Al with a weight of 4.5kg 2 o 3 As an additive; a mixture of 2.3 kg of citric acid and 8 kg of ethylene glycol as a dispersant; 400 kg of saturated ammonium sulfate solution as a mineralizer.

[0024] A kind of precursor of high-purity sinterable alumina ceramic powder-high-purity aluminum ammonium carbonate preparation process is as follows:

[0025] (1) Choose solid ammonium bicarbonate and aluminum ammonium sulfate as raw materials with a purity of 99.999%, and choose α-Al 2 o 3 As an additive, a mixture of citric acid and ethylene glycol is selected as a dispersant;

[0026] (...

Embodiment 2

[0033] A precursor of high-purity and easy-to-sinter alumina ceramic powder - high-purity ammonium aluminum carbonate, is based on 970kg crystalline solid ammonium bicarbonate and 1294kg crystalline solid ammonium aluminum sulfate as raw materials, and the above two components After chemical reaction synthesis, it becomes a precursor - high-purity ammonium aluminum carbonate; among them, crystalline α-Al with a weight of 4.5kg 2 o 3 As an additive; a mixture of 2.3 kg of citric acid and 8 kg of ethylene glycol as a dispersant; 400 kg of saturated ammonium sulfate solution as a mineralizer.

[0034] A kind of precursor of high-purity sinterable alumina ceramic powder-high-purity aluminum ammonium carbonate preparation process is as follows:

[0035] (1) Choose solid ammonium bicarbonate and aluminum ammonium sulfate as raw materials with a purity of 99.999%, and choose α-Al 2 o 3 As an additive, a mixture of citric acid and ethylene glycol is selected as a dispersant;

[00...

Embodiment 3

[0043]A precursor of high-purity and easy-to-sinter alumina ceramic powder - high-purity ammonium aluminum carbonate is based on 957kg crystalline solid ammonium bicarbonate and 1307kg crystalline solid ammonium aluminum sulfate as raw materials. The above two components After chemical reaction synthesis, it becomes a precursor - high-purity ammonium aluminum carbonate; among them, crystalline α-Al with a weight of 4.5kg 2 o 3 As an additive; a mixture of 2.3 kg of citric acid and 8 kg of ethylene glycol as a dispersant; 400 kg of saturated ammonium sulfate solution as a mineralizer.

[0044] A kind of precursor of high-purity sinterable alumina ceramic powder-high-purity aluminum ammonium carbonate preparation process is as follows:

[0045] (1) Choose solid ammonium bicarbonate and aluminum ammonium sulfate as raw materials with a purity of 99.999%, and choose α-Al 2 o 3 As an additive, a mixture of citric acid and ethylene glycol is selected as a dispersant;

[0046] (2...

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Abstract

The invention belongs to the technical field of preparation, moulding and processing of an inorganic nonmetallic material, namely superfine nano powder, in particular to a preparation process of a high-purity ammonium aluminum carbonate hydroxide as a precursor of high-purity easy-sintering aluminum oxide ceramic powder. The high-purity ammonium aluminum carbonate hydroxide as the precursor of the high-purity easy-sintering aluminum oxide ceramic powder is prepared by the following steps of: carrying out chemical reaction synthesis on 41.68-42.85 percent by weight of crystalline solid ammonium hydrogen carbonate and 57.15-58.32 percent by weight of crystalline solid aluminum ammonium sulfate which are adopted as raw materials; and then forming the high-purity ammonium aluminum carbonate hydroxide as the precursor, wherein 0.2-0.3 percent by weight of crystalline alpha-Al2O3 is used as an additive; a mixture of 0.1-0.15 percent by weight of citric acid and 0.35-0.5 percent by weight of glycol is used as a dispersing agent; and an ammonium sulfate solution of 0.2 times of the weight sum of the solid ammonium hydrogen carbonate and the solid aluminum ammonium sulfate is used as a mineralizing agent. The invention has the advantages of energy saving, environmental protection and cleanness.

Description

technical field [0001] The invention belongs to the technical field of preparation, molding and processing of inorganic non-metallic material-ultrafine nanometer powder, and in particular relates to a preparation process of high-purity ammonium aluminum carbonate, a precursor of high-purity easy-sintering alumina ceramic powder. Background technique [0002] The preparation technology of high-purity aluminum ammonium carbonate is the world's leading technology level with Japan's Daming Co., Ltd. With fully automatic control technology, it can strictly and strictly control the synthesis temperature between 42±0.5°C. Therefore, the physical properties of the obtained ammonium aluminum carbonate can meet the technical requirements of the final product of high-purity and easily sinterable alumina ceramic powder. The control of the preparation of this intermediate (precursor) in China is completely controlled by humans, and human factors have a great influence. The temperature r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/00
Inventor 王彪邢世军
Owner JIAZUO HONGCHENG ADVANCED CERAMIC TECH
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