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Method for preparing caustic soda and calcium chloride with cogeneration of powdery calcium salt by using salting-out master liquid in zinc powder method

A zinc powder method, calcium chloride technology, applied in chemical instruments and methods, alkali metal compounds, calcium/strontium/barium chloride, etc., can solve the problems of low salt recovery, secondary pollution, escape, etc., to achieve Considerable economic benefits, pollution control, and simple equipment

Inactive Publication Date: 2012-01-25
冯若愚
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  • Summary
  • 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

Method used

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  • Method for preparing caustic soda and calcium chloride with cogeneration of powdery calcium salt by using salting-out master liquid in zinc powder method
  • Method for preparing caustic soda and calcium chloride with cogeneration of powdery calcium salt by using salting-out master liquid in zinc powder method

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Effect test

Embodiment 1

[0025] The method for preparing caustic soda and calcium chloride co-production powder calcium salt with the salting-out mother liquor in the zinc powder method comprises the following preparation steps:

[0026] Step A, put 1000 liters of salting-out mother liquor and calcium hydroxide solution in the zinc powder method into the corrosion-resistant reactor 1 according to the mass ratio of pure substance 1: 0.59 (wherein containing 250Kg of sodium chloride, 40Kg of sodium sulfite, dihydrogen Sodium sulfite 20Kg and sodium sulfate 10Kg, according to the mass ratio of sodium chloride and calcium hydroxide 1: 0.59, the mass ratio of sodium sulfite and calcium hydroxide 1: 0.59, the mass ratio of sodium dithionite and calcium hydroxide 1: 0.95, sulfuric acid The mass ratio of sodium and calcium hydroxide is calculated at 1:0.59, then the calcium chloride required to drop in is 188.8Kg), stirring constantly; the reaction generates sodium hydroxide, calcium chloride, calcium sulfate,...

Embodiment 2

[0032] The method for preparing caustic soda and calcium chloride co-production powder calcium salt with the salting-out mother liquor in the zinc powder method comprises the following preparation steps:

[0033] Step A, put 1000 liters of salting-out mother liquor and calcium hydroxide solution in the zinc powder method into the corrosion-resistant reactor 1 according to the mass ratio of pure substance 1: 1.09 (wherein containing 250Kg of sodium chloride, 40Kg of sodium sulfite, dihydrochloride Sodium sulfite 20Kg and sodium sulfate 10Kg, according to the mass ratio of sodium chloride and calcium hydroxide 1: 1.09, the mass ratio of sodium sulfite and calcium hydroxide 1: 1.09, the mass ratio of sodium dithionite and calcium hydroxide 1: 1.09, sulfuric acid The mass ratio of sodium and calcium hydroxide is calculated at 1: 1.09, then the calcium hydroxide required to drop in is 348.8Kg), stirring constantly; the reaction generates sodium hydroxide, calcium chloride, calcium s...

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Abstract

The invention belongs to the technical field of treatment and utilization of three wastes (waste gas, waste water and waste residues) in the chemical industry, and particularly relates to a method for preparing caustic soda and calcium chloride with cogeneration of a powdery calcium salt by using salting-out master liquid generated in a zinc powder method. In the invention, by mainly utilizing the salting-out master liquid, which is generated in a process of preparing sodium hydrosulfite by using the zinc powder method, for treating calcium hydroxide, not only can caustic soda, calcium chloride and powdery calcium salt products with economic values and better purity be produced, but also the three wastes are hardly discharged to cause pollution, and a semi-finished product of detergent can even be recycled for dissolving raw materials. The method disclosed by the invention not only has the advantage of simple production process and equipment and low cost, but also can be used for effectively treating the environment pollution caused by the salting-out master liquid generated when the zinc powder method is used for preparing the sodium hydrosulfite, and is beneficial to creation of considerable economic benefits 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 caustic soda and calcium chloride to co-produce powdered calcium salt by using the salting-out mother liquor produced in the preparation of sodium hydrosulfite by the zinc powder method. technical background [0002] Zinc powder method 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 ente...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/28C01D1/20C01F11/48C01B17/66C01F11/46
Inventor 王嘉兴
Owner 冯若愚
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