Separating and using method for mixed sodium salt

A technology of sodium salt and mixture, which is applied in the field of separation and utilization of mixed sodium salt, can solve the problems of small application market and low resource value of industrial grade sodium chloride and sodium sulfate products, and achieve strong reproducibility, short process route, The effect of low operational difficulty

Inactive Publication Date: 2019-02-22
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0007] At present, the treatment technology and process of mixed salt are to separate and recover sodium sulfate and sodium chloride. On the one hand, there are defects and deficiencies in

Method used

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  • Separating and using method for mixed sodium salt

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Effect test

Embodiment 1

[0066] 1) Pre-preparation of mixed sodium salt: Weigh 50.16g of thermoelectric mixed salt and 9.84g of agrochemical salt, of which sodium chloride accounts for 37.92% in thermoelectric salt, sodium sulfate accounts for 54.36%, and sodium chloride in agrochemical salt accounts for The proportion is 89.53%, and sodium sulfate accounts for 3.17%. According to the mass ratio of 1:1, it is configured as a mixed sodium salt system 60g, simulating the mixed sodium salt produced in industrial production;

[0067] 2) Sodium salt inorganic conversion: use 300g of dilute ammonia water with a concentration of 10% to dissolve the mixed salt, pass in carbon dioxide through the gas-liquid two-phase reaction for 20 hours, and obtain sodium bicarbonate, ammonium chloride, and sulfuric acid through the conversion of the sodium salt system Sodium mixed system, the ammonium ion concentration is 6.39%, the chloride ion concentration is 5.16%, the sodium ion concentration is 2.65%, and the sulfate ...

Embodiment 2

[0072] 1) Pre-preparation of mixed sodium salt: Weigh 76g of analytically pure sodium sulfate and sodium chloride, and configure 152g of mixed sodium salt system according to the mass ratio of 1:1, simulating the mixed sodium salt produced in industrial production;

[0073] 2) Inorganic conversion of sodium salt: Dissolve the mixed salt with 800g of dilute ammonia water with a concentration of 10% ammonia water, and pass in carbon dioxide to conduct a gas-liquid two-phase reaction for 20 hours, and obtain sodium bicarbonate, ammonium chloride, and sulfuric acid through the conversion of the sodium salt system Sodium mixed system, the ammonium ion concentration is 5.01%, the chloride ion concentration is 6.52%, the sodium ion concentration is 2.59%, and the sulfate ion concentration is 7.29%.

[0074] 3) Concentration and precipitating: 670g of sodium sulfate and ammonium chloride mixed system was evaporated and concentrated at -0.095Mpa, 80°C, the amount of steamed water was 43...

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Abstract

The invention provides a separating and using method for mixed sodium salt. The method comprises the following steps: A) adding the mixed sodium salt to ammonia water, to obtain ammoniacal brine, wherein a mass ratio of sodium sulfate and sodium chloride in the mixed sodium salt is 1:(0.5-2), and concentration of the ammonia water is 8-12%; B) feeding carbon dioxide to the ammoniacal brine, performing a gas liquid reaction, to obtain a mixed system, wherein a feeding quantity of the carbon dioxide is 10-30 L/h; C) performing evaporation and concentration on the mixed system, separating out andcrystallizing, to obtain saline mixture; and D) filtering the saline mixture, washing filter residue by using sodium sulfate saturated solution, to obtain a sodium sulfate product, cooling and crystallizing filtrate, washing a separated crystal by using ammonium chloride saturated solution, to obtain an ammonium chloride product. The method is capable of, on the basis of separating and recoveringthe sodium sulfate, converting the sodium chloride into the ammonium chloride with the wider application range, and providing a new technology for separation of the sodium sulfate and the sodium chloride.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource treatment, and in particular relates to a method for separating and utilizing mixed sodium salts. Background technique [0002] The mixed sodium salt of sodium sulfate and sodium chloride is mainly produced in the coal chemical industry and zero-discharge wastewater treatment. According to statistics, the mixed sodium salt produced in these two industries is about 5 to 6 million tons per year. At present, the main way to dispose of this mixed salt is the combined production of salt and nitrate. [0003] Salt and nitrate co-production is to separate and recover the sodium chloride salt and sodium sulfate salt in the raw brine. At present, the main methods are: three production technologies and process modes: freezing salt salt cogeneration, thermal salting out salt salt coproduction and evaporation salt salt coproduction. The principles of the three methods are based on the NaCl-Na ...

Claims

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Application Information

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IPC IPC(8): C01D5/00C01C1/16
CPCC01C1/164C01D5/00C01P2006/80Y02P20/141
Inventor 李平马韵升李亮莎赵云飞陈维英魏国强张学雷高学坤王萍
Owner CHAMBROAD CHEM IND RES INST CO LTD
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