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Method for producing aluminum citrate from kaoline

A technology of aluminum citrate and kaolin, applied in carboxylate preparation, organic chemistry, etc., can solve the problems of unsuitability for large-scale industrial production and high cost of aluminum salt, and achieve the effect of cheap and easy-to-obtain raw materials and simple process

Inactive Publication Date: 2007-12-26
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of cheap and easy-to-obtain raw material, simple process and no environmental pollution for the problem that the cost of aluminum salt in the production method of aluminum citrate in the prior art is relatively high and it is not suitable for large-scale industrial production. Process for producing aluminum citrate from kaolin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Roasting activation

[0015] Kaolin is crushed and ground into mineral powder with a particle size of -380μm. After the mineral powder is compacted, it is roasted in a high-temperature furnace. The roasting temperature is 675°C and the roasting time is 3 hours, so that the kaolinite mineral in kaolin is dehydrated into a Reactive metakaolinite.

[0016] (2) acid soluble

[0017] 5g of cooled activated kaolin was added to 100mL of 20% by weight citric acid solution, stirred and leached at 85°C, the reaction time was 6h, and the dissolution rate of alumina in the activated kaolin was above 60%.

[0018] (3) crystallization

[0019] Filtrate while it is hot, let the leaching solution stand at 15°C for 5 days, and more than 70% of the aluminum citrate in the solution crystallizes out. An appropriate amount of citric acid is added to the solution after the aluminum citrate crystals are precipitated, which can be recycled for the leaching of aluminum citrate. The soli...

Embodiment 2

[0023] (1) Roasting activation

[0024] Kaolin is crushed and ground into mineral powder of -250μm. After the mineral powder is compacted, it is roasted in a high-temperature furnace. The roasting temperature is 700°C and the roasting time is 3.5 hours, so that the kaolinite mineral in kaolin is dehydrated into a Reactive metakaolinite.

[0025] (2) acid soluble

[0026] 5g of cooled activated kaolin was added to 100mL of 20% by weight citric acid solution, stirred and leached at 90°C, the reaction time was 7h, and the dissolution rate of alumina in activated kaolin was above 68%.

[0027] (3) crystallization

[0028] Filter while it is hot, let the leaching solution stand at 13°C for 6 days, and more than 75% of the aluminum citrate in the solution crystallizes out. An appropriate amount of citric acid is added to the solution after the aluminum citrate crystals are precipitated, which can be recycled for the leaching of aluminum citrate. The solid acidic silicon slag obt...

Embodiment 3

[0032] (1) Roasting activation

[0033] Kaolin is crushed and ground into mineral powder of -150μm. After the mineral powder is compacted, it is roasted in a high-temperature furnace. The roasting temperature is 725°C and the roasting time is 4 hours, so that the kaolinite minerals in kaolin are dehydrated and become reactive. Reactive metakaolinite.

[0034] (2) acid soluble

[0035] 5g of cooled activated kaolin was added to 100mL of 20% by weight citric acid solution, stirred and leached at 95°C, the reaction time was 8h, and the dissolution rate of alumina in the activated kaolin was over 70%.

[0036] (3) crystallization

[0037] Filtrate while it is hot, let the leaching solution stand at 10°C for 7 days, and more than 80% of the aluminum citrate in the solution crystallizes out. An appropriate amount of citric acid is added to the solution after the aluminum citrate crystals are precipitated, which can be recycled for the leaching of aluminum citrate. The solid acid...

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PUM

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Abstract

This invention relates to a method for producing aluminum citrate from kaolin by acid dissolution and crystallization. The method comprises: mechanically crushing kaolin, pressing into block, torrefying in a high temperature furnace so that kaolinite in kaolin is dehydrated to obtain metakoalin with reactive activity, torrefying, adding into citric acid solution, stirring, leaching, filtering, precipitating white aluminum citrate crystal from the filtrate, separating, and crystallizing to obtain aluminum citrate product. The method utilizes kaolin instead of aluminum salt as the raw material, and has such advantages as abundant raw material, and simple process.

Description

technical field [0001] A method for producing aluminum citrate from kaolin relates to a method for producing aluminum citrate, in particular to a method for producing aluminum citrate by using kaolin as a raw material and adopting an acid-dissolution-crystallization two-step method. Background technique [0002] Aluminum citrate, chemical structure is AlC 6 h 5 o 7 ·3H 2 O, molecular weight 270.12, white crystalline powder. Aluminum citrate is used in oil field additives, drugs to treat silicosis, and can also be used to produce chemical alumina. [0003] The current method for producing aluminum citrate is to react aluminum salts such as aluminum chloride, aluminum sulfate, and sodium aluminate with a citric acid solution, adjust the pH value, remove insoluble matter by filtration, and dry and crystallize the filtrate to obtain an aluminum citrate product. [0004] The above-mentioned production method has the following problems: the cost of producing raw material alum...

Claims

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Application Information

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IPC IPC(8): C07C59/265C07C51/41
Inventor 周吉奎赵卓曹慧君
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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