Treatment method for solid sodium tetrachloroaluminate residue

A sodium tetrachloroaluminate and treatment method technology, applied in the field of inorganic chemistry, can solve the problems of increased treatment cost, complicated process, and difficult separation

Active Publication Date: 2020-10-23
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method not only does not separate aluminum and sodium before the high-temperature reaction, but a large amount of phosphoric acid or phosphate needs to be added to the high-temperature reaction, which increases the processing cost, but also belongs to the high-temperature reaction with high energy consumption, and the product obtained by the high-temperature reaction is Mixture of sodium phosphate and aluminum tripolyphosphate, difficult to separate
[0007] In summary, the treatment methods disclosed in the prior art all have disadvantages such as complex process, high cost, and risk of cross-contamination. Therefore, it is urgent to develop an effective treatment method for sodium tetrachloroaluminate solid slag method to achieve the purpose of cost reduction, efficient and thorough resource utilization of sodium tetrachloroaluminate solid slag

Method used

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  • Treatment method for solid sodium tetrachloroaluminate residue
  • Treatment method for solid sodium tetrachloroaluminate residue
  • Treatment method for solid sodium tetrachloroaluminate residue

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Embodiment 1

[0066] This embodiment provides a treatment method for sodium tetrachloroaluminate solid slag, which is derived from phosphorus trichloride, methyl chloride, aluminum trichloride, aluminum powder and sodium chloride, etc. In the production process of synthesizing diethyl methylphosphonite from raw materials, the content of sodium tetrachloroaluminate in the solid slag is 95%, and the treatment method comprises the following steps:

[0067] (1) Mix 100 g of solid residue with a sodium tetrachloroaluminate content of 95% and 300 g of water, dissociate at 80° C. for 1.5 h, add 5 g of oxidant sodium chlorate, and oxidize at 90° C. for 1 h;

[0068] (2) Add 40 g of sodium hydroxide solid with a content of 96% to the dissociation solution obtained in step (1), and polymerize at 80° C. for 1 h;

[0069] (3) The polymerization reaction solution obtained in step (2) was subjected to atmospheric concentration crystallization and solid-liquid separation at an end point temperature of 114...

Embodiment 2

[0073] This embodiment provides a treatment method for sodium tetrachloroaluminate solid slag, which is the same as in Example 1, and the treatment method includes the following steps:

[0074] (1) Mix 100 g of solid residue with a sodium tetrachloroaluminate content of 95% and 500 g of water, dissociate at 90° C. for 1 hour, add 5 g of oxidizing agent sodium chlorate, and oxidize at 90° C. for 1 hour;

[0075] (2) Add 40 g of sodium hydroxide solid with a content of 96% to the dissociation solution obtained in step (1), and polymerize at 95° C. for 1 h;

[0076](3) The polymerization reaction solution obtained in step (2) was subjected to atmospheric concentration crystallization and solid-liquid separation at an end point temperature of 114° C. to obtain 120 g of sodium chloride solid and 170 g of concentrated mother liquor;

[0077] Among them, 120 g of sodium chloride solid is washed with 100 g of water, and then dried to obtain 80 g of sodium chloride product, which can b...

Embodiment 3

[0080] This embodiment provides a treatment method for sodium tetrachloroaluminate solid slag, which is the same as in Example 1, and the treatment method includes the following steps:

[0081] (1) Mix 100 g of solid residue with a sodium tetrachloroaluminate content of 95% and 400 g of water, dissociate at 60°C for 3 hours, add 50 g of oxidant hydrogen peroxide, and oxidize at 60°C for 1 hour;

[0082] (2) Add 100 g of sodium hydroxide solution with a content of 40% to the dissociation solution obtained in step (1), and polymerize at 70° C. for 2 h;

[0083] (3) The polymerization reaction solution obtained in step (2) was subjected to atmospheric concentration crystallization and solid-liquid separation at an end point temperature of 114° C. to obtain 120 g of sodium chloride solid and 170 g of concentrated mother liquor;

[0084] Among them, 120 g of sodium chloride solid is washed with 100 g of water, and then dried to obtain 80 g of sodium chloride product, which can be r...

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Abstract

The invention relates to a treatment method for solid sodium tetrachloroaluminate residue. The treatment method comprises the following steps: mixing the solid sodium tetrachloroaluminate residue withwater and dissociating at first; then adding alkali and carrying out polymerization reaction; then carrying out concentration and crystallization, and solid-liquid separation to obtain a sodium chloride solid and a concentrated mother solution; and then curing the obtained concentrated mother solution to obtain a polyaluminum chloride liquid product. According to the treatment method, aluminum chloride and sodium chloride which are obtained by dissociating the solid sodium tetrachloroaluminate residue are adequately recovered, so that the problem of disposal for the solid waste is solved, andthe polyaluminum chloride liquid product with a high additional value is prepared, the mass fraction of Al2O3 is not less than 10%, the basicity of Al2O3 is not less than 60%, and the index requirements of the national standards GB 15892-2009 are met; and according to the treatment method, an organic solvent does not need to be introduced, so that cross contamination is avoided, and the cost canbe lowered, and the treatment method has the advantages of being simple in process flow, simple and convenient to operate, low in equipment investment, and the like.

Description

technical field [0001] The invention relates to the technical field of inorganic chemistry, in particular to a method for treating solid slag of sodium tetrachloroaluminate. Background technique [0002] Methyl phosphine dichloride is an important organic chemical intermediate, widely used in the fields of pesticides, medicine, synthetic materials, etc., especially the intermediate for the synthesis of diethyl methyl phosphonite. At present, the industrial synthesis method of diethyl methylphosphonite mainly contains following three kinds: method one, take phosphorus trichloride and triethyl phosphite as the synthetic method of raw material; Method two, use aluminum powder, methyl chloride, A synthesis method using phosphorus trichloride and ethanol as starting materials; Method 3, a synthesis method using aluminum trichloride, methyl chloride, phosphorus trichloride and ethanol as starting materials. Among them, methods 2 and 3 often produce a large amount of solid waste a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor 周曙光秦龙余神銮祝小红王萍姜胜宝付萍闫涛涛
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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