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Sodium sulfate and sodium chloride mixed wastewater separation method and separation apparatus thereof

A technology for mixing wastewater and separation methods, applied in chemical instruments and methods, alkali metal chlorides, alkali metal compounds, etc., can solve problems such as unusability, and achieve high-purity effects

Inactive Publication Date: 2016-09-28
上海亿华科技有限公司 +2
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Problems solved by technology

[0003] For the separation and purification method of the mixed wastewater of sodium sulfate and sodium chloride, the commonly used method is to heat the mixed wastewater containing sodium sulfate and sodium chloride to the boiling point to completely evaporate the water. The defect is to use sodium sulfate as an industrial raw material , Sodium Chloride turned into a mixture, became a waste because it could not be used

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  • Sodium sulfate and sodium chloride mixed wastewater separation method and separation apparatus thereof

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Embodiment Construction

[0019] The separation method of the mixed wastewater of sodium sulfate and sodium chloride of the present invention, comprises the steps:

[0020] (1) Add industrial sodium chloride to the mixed wastewater of sodium sulfate and sodium chloride, and control the temperature at 30°C±5°C to make the concentration of sodium chloride in the solution reach 18%±1%. The crystal form is partly separated out, but the sodium chloride still exists in the form of solution before reaching the precipitation concentration, and the sodium sulfate crystal is separated out, and the mixed solution is subjected to solid-liquid separation, and the separated sodium sulfate crystal is washed with water to obtain industrial anhydrous sodium sulfate;

[0021] (2) Put the separated liquid into the evaporator for evaporation, heat and concentrate with steam, and continuously precipitate mixed crystals of sodium chloride and sodium sulfate, and then mix the concentrated mixed liquid with new mixed wastewate...

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Abstract

The invention relates to a sodium sulfate and sodium chloride mixed wastewater separation method and a separation apparatus thereof. The separation method comprises the following steps: increasing the sodium chloride content of sodium sulfate and sodium chloride mixed wastewater to precipitate parts of sodium sulfate, evaporating the mixed wastewater to increase the concentration in order to respectively crystallize the evaporated wastewater to precipitate sodium chloride and sodium sulfate mixed crystals, returning the obtained wastewater, mixing and dissolving the returned wastewater in the new sodium chloride content of sodium sulfate and sodium chloride mixed wastewater, and precipitating sodium sulfate crystals and sodium chloride crystals step by step to finally realize sodium sulfate and sodium chloride separation. The quantity of energy consumed in the evaporation mode treatment of wastewater in the method is same to the quantity of energy consumed in the evaporation mode treatment of wastewater in the prior art. The method and the apparatus avoid the problem of generation of a large amount of solid wastes after wastewater evaporation in the prior art, realize sodium sulfate and sodium chloride separation and purification without adding other reagents, truly realize zero discharge, and allow separated sodium sulfate and sodium chloride to be highly pure and to be directly used and sold as industrial products.

Description

technical field [0001] The invention relates to a chemical wastewater treatment method, in particular to a separation method and a separation device for mixed wastewater of sodium sulfate and sodium chloride. Background technique [0002] In industrial production, the mixed wastewater of sodium sulfate and sodium chloride is a relatively common type of wastewater. Due to the requirements of "three wastes" treatment, it was only necessary to concentrate the wastewater to solid slag, and these solid slags were regarded as "solid waste" " to discharge. At present, the "solid waste" concentrated to solid slag is not allowed in the treatment of wastewater, and the environmental pollution caused by "solid waste" cannot be underestimated. Therefore, "solid waste" is now called "hazardous waste". This name change reflects that in the process of treating wastewater, useful substances must be extracted and made into products that meet national requirements for reuse. To reduce the a...

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Application Information

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IPC IPC(8): C01D3/04C01D5/00
CPCC01D3/04C01D5/00
Inventor 顾仲良
Owner 上海亿华科技有限公司
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