Method for preparing sodium chloride and powdery barium salt by using salting-out mother liquor generated in zinc powder method

A zinc powder method, sodium chloride technology, applied in the direction of alkali metal chloride, thiosulfate/dithionite/polythionite, calcium/strontium/barium sulfate, etc., can solve the cost of recovering salt Improve and recover the low quality of salt, secondary pollution and other problems, to achieve the effect of simple production process and equipment, high quality of recovered salt, and pollution control

Inactive Publication Date: 2012-01-25
冯若愚
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the hydrochloric acid neutralization method and the direct recovery method are the methods with simple technology and the least investment, but the hydrochloric acid neutralization method needs to consume a large amount of hydrochloric acid, which greatly increases the cost of recovering salt. Not only the quality of recovered salt is low, but also acidic, It has a certain impact on the production of hydrosulfite, and sulfur dioxide gas will escape during the reaction process, and it will also cause secondary pollution

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  • Method for preparing sodium chloride and powdery barium salt by using salting-out mother liquor generated in zinc powder method
  • Method for preparing sodium chloride and powdery barium salt by using salting-out mother liquor generated in zinc powder method

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Embodiment 1

[0022] The method for preparing sodium chloride and powder barium salt with the salting-out mother liquor in the zinc powder method is characterized in that: comprising the following preparation steps:

[0023] Step A, put 1000 liters of salting-out mother liquor and barium chloride solution in the zinc powder method into corrosion-resistant reactor 1 according to the mass ratio of pure substance 1: 0.95 (wherein containing sodium sulfite 40Kg, sodium dithionite 20Kg, sodium sulfate 10Kg, calculated according to the mass ratio of sodium sulfite to barium chloride 1:0.95, the mass ratio of sodium dithionite to barium chloride 1:0.95, and the mass ratio of sodium sulfate to barium chloride 1:0.95, the required input Barium chloride is 66.5Kg), constantly stirring; Reaction generates the mixed solution of sodium chloride, barium sulfite dithionite barium dithionite and barium sulfate;

[0024] Step B, filter the mixed solution obtained in step A with a filter 2;

[0025] Step C,...

Embodiment 2

[0029] The method for preparing sodium chloride and powder barium salt with the salting-out mother liquor in the zinc powder method is characterized in that: comprising the following preparation steps:

[0030] Step A, put 1000 liters of salting-out mother liquor and barium chloride solution in the zinc powder method into corrosion-resistant reactor 1 according to the mass ratio of pure substance 1: 1.65 (wherein containing 250Kg of sodium chloride, 40Kg of sodium sulfite, bis- Sodium sulfite 20Kg, sodium sulfate 10Kg, calculate according to the mass ratio of sodium sulfite and barium chloride 1: 1.65, the mass ratio of sodium dithionite and barium chloride 1: 1.65, and the mass ratio of sodium sulfate and barium chloride 1: 1.65, respectively, Then the barium chloride that needs to drop into is 115.5Kg), keep stirring; Reaction generates the mixed solution of sodium chloride, barium sulfite dithionite and barium sulfate;

[0031] Step B, filter the mixed solution obtained in ...

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Abstract

The invention belongs to the technical field of treatment and utilization of the three wastes in the chemical industry, and in particular relates to a method for preparing sodium chloride and powdery barium salt by using salting-out mother liquor generated in a zinc powder method. According to the invention, barium chloride is mainly adopted to treat the salting-out mother liquor which is generated in the preparation of sodium hydrosulfite by using the zinc powder method, thus not only can sodium chloride and powdery barium salt products which have economic values and are pure be produced, but also almost no pollution is caused by the emission of the three wastes, and even a semi-finished product cleaning solution can also be recovered and utilized to dissolve raw materials. The method has the advantages of simple production process, simple equipment and low cost; and by using the method, the environmental pollution caused by the salting-out mother liquor, which is generated in the preparation of sodium hydrosulfite by using the zinc powder method, can be effectively controlled, and considerable economic benefits are created at the same time.

Description

technical field [0001] The invention belongs to the technical field of comprehensive treatment and utilization of three wastes in the inorganic chemical industry, in particular to a method for preparing sodium chloride and powdered barium salt from the salting-out mother liquor produced in the preparation of sodium hydrosulfite by the zinc powder method. technical background [0002] Preparation of hydrosulfite (Na 2 S 2 o 4 2H 2 O, sodium dithionite) is a product obtained by first introducing sulfur dioxide into the zinc suspension, and then using sodium hydroxide for metathesis, filtration, salting out, dehydration, and drying. Its important use is as printing and dyeing reducing agent, pulp bleaching agent, etc. This method produces a large amount of salting-out mother liquor during the salting-out process, and an average of 7 to 8 cubic meters of mother liquor can be produced for every ton of sodium hydrosulfite produced. An enterprise with an annual output of 5,000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04C01F11/48C01F11/46C01B17/66
Inventor 王嘉兴
Owner 冯若愚
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