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Separation device and separation method for multi-specific-gravity-concentration sodium sulfate and magnesium sulfate mixed salt solution

A separation method and mixed salt technology, which is applied to the purification of alkali metal sulfite/sulfate, magnesium sulfate, magnesium carbonate, etc., can solve the problems of low recovery rate of elemental salt and waste of energy, and achieve comprehensive utilization and waste reduction. The effect of liquid discharge and simple process operation

Active Publication Date: 2020-09-11
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

At the same time, the third wastewater treatment company has sodium-magnesium wastewater with various specific gravity concentrations. Although the post-treatment process of mixing sodium-magnesium wastewater with different concentrations and specific gravity is simple, the change in the concentration ratio may lead to a decrease in the recovery rate of the final elemental salt, wasting energy, In order to improve the treatment efficiency of sodium bisulfate and magnesium sulfate wastewater with different concentrations and the recovery rate of elemental salt, and improve the economic benefits of third-party wastewater treatment units

Method used

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  • Separation device and separation method for multi-specific-gravity-concentration sodium sulfate and magnesium sulfate mixed salt solution

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Embodiment 1

[0041] The present embodiment separates the mixed salt solution L1 of W1 / W2=5 and the mixed salt solution L2 of W1 / W2=0.1, wherein the mixed salt solution L1 is 1000g, W1=8%, W2=1.6%; the mixed salt solution L2 is 1000g, W1=1%, W2=10%.

[0042] Mixed salt solution L1 W1 / W2=5>2.75, L1 is sent to the first forced circulation evaporator to be concentrated by vacuum evaporation at 75°C, and isothermally evaporated to the elemental crystallization area of ​​sodium sulfate, and sodium sulfate crystals are precipitated until sulfuric acid in the liquid phase Sodium concentration is 380g / L, stop evaporating, now sodium sulfate crystallization amount reaches maximum, through the centrifugal separation of first centrifuge, obtain sodium sulfate crystal 36g after oven dry, mother liquor A1175.8g, mother liquor A1 W1=25%, W2= 9.1%, mother liquor A1 enters the first tank type cooling crystallizer and cools to 0°C for cooling and crystallization. After equilibrium, it is centrifuged and sep...

Embodiment 2

[0045] This embodiment separates W1 / W2=5 mixed salt solution L1, W1 / W2=1.5 mixed salt solution L2 and W1 / W2=0.3 mixed salt solution L3, wherein mixed salt solution L1 is 1000g, W1=10%, W2 =2%; mixed salt solution L2 is 1000g, W1=6%, W2=4%; mixed salt solution L3 is 1000g, W1=2.4%, W2=8%.

[0046] Mixed salt solution L1 W1 / W2=5>2.75, L1 is sent to the first forced circulation evaporator to be concentrated by vacuum evaporation at 75°C, and isothermally evaporated to the elemental crystallization area of ​​sodium sulfate, and sodium sulfate crystals are precipitated until sulfuric acid in the liquid phase Sodium concentration is 380g / L, stops evaporation, and this moment sodium sulfate crystallization amount reaches maximum, through the centrifugal separation of first centrifuge, obtains sodium sulfate crystal 45g after oven dry, mother liquor A1219.8g, mother liquor A1 W1=25%, W2= 9.1%, mother liquor A1 enters the first tank type cooling crystallizer and is cooled to 0 ℃ for co...

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Abstract

The invention relates to a separation device and a separation method for a sodium sulfate and magnesium sulfate mixed salt solution with multiple specific gravity concentrations. The device comprisesa first cooling evaporation unit, a second cooling evaporation unit, a reaction unit and a third cooling evaporation unit, wherein the first cooling evaporation unit, the second cooling evaporation unit, the reaction unit and the third cooling evaporation unit are sequentially connected through pipelines. The separation device is scientific and reasonable in structural design, can realize efficient recovery of elemental salt, improves the recycling of mixed salt in inorganic wastewater, reduces the pressure of wastewater treatment, reduces the treatment cost of high-salt inorganic wastewater,and realizes comprehensive utilization of industrial wastewater resources.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environmental protection, and relates to the salt separation of a mixed brine system, in particular to a separation device and a separation method for a mixed salt solution of sodium sulfate and magnesium sulfate with multiple specific gravity concentrations. Background technique [0002] In the existing industrial wastewater treatment technology, general industrial wastewater undergoes front-end pretreatment to remove suspended solids in industrial wastewater, reduce COD, and precipitate heavy metal ions, etc., leaving the back-end wastewater as high-concentration mixed inorganic salt wastewater. For this kind of high-salt inorganic wastewater, evaporation fractionation crystallization method is often used to realize the final "zero discharge" of wastewater and resource recovery. [0003] The mixed wastewater of sodium sulfate and magnesium sulfate occupies a large proportion in the high-sal...

Claims

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Application Information

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IPC IPC(8): C01D5/16C01F5/24C01F5/40
CPCC01D5/16C01F5/40C01F5/24
Inventor 宋继田苏杭刘建波宋玉臣周山林石冬琪
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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