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A method for treating si-69 industrial production wastewater

A waste water and chloride technology, applied in natural water treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of secondary pollution of hydrochloric acid, potential safety hazards in the transportation and storage of hydrochloric acid, etc. Reduced waste water discharge and environmental impact, safe and convenient storage and transportation

Active Publication Date: 2020-10-09
永修县艾科普新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of hydrochloric acid, improper handling may easily lead to secondary pollution of hydrochloric acid, and at the same time, transportation and storage of hydrochloric acid are prone to safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add the waste water produced in the production process of Si-69 into the stirring tank and stir, take 50ml of waste water to calibrate the sulfur content (using the iodometric method), and the sulfur content in it is measured to be about 18%.

[0023] (2) Slowly add an equivalent amount of 6% AlCl to it 3 solution, while adding a small amount of HCl to adjust the pH. The measured pH is about 6.7 (when the pH is less than or equal to 7, it can be judged that the sodium thiosulfate and sodium sulfite inside have been completely reacted), and the stirring is continued for 15 minutes.

[0024] (3) The reaction process will generate SO 2 The gas is passed into liquid caustic soda for absorption.

[0025] (4) Add flocculant into it to absorb and settle the oil layer on the surface.

[0026] (5) Filter, evaporate and crystallize the solution to obtain 94.25% NaCl and 3.4% Na 2 SO 4 , and then recrystallized to separate and purify the two.

[0027] (6) The rest is an ...

Embodiment 2

[0029] (1) Add the waste water produced in the production process of Si-69 into the stirring tank and stir, take 50ml of waste water to calibrate the sulfur content (using the iodometric method), and the sulfur content in it is measured to be about 18%.

[0030] (2) Slowly add an equivalent amount of 6% FeCl to it 3 solution, while adding a small amount of HCl to adjust the pH. The pH was measured to be about 6.7 and stirring was continued for 20 minutes.

[0031] (3) The reaction process will generate SO 2 The gas is passed into liquid caustic soda for absorption.

[0032] (4) Add flocculant into it to absorb and settle the oil layer on the surface.

[0033] (5) Filter, evaporate and crystallize the solution to obtain 95.60% NaCl and 3.3% Na 2 SO 4 , and then recrystallized to separate and purify the two.

[0034] (6) The rest is an aqueous solution containing 18% phase transfer catalyst tetrabutylammonium bromide, which is recycled for the production of Si-69.

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PUM

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Abstract

The invention provides a method for treating Si-69 industrial production wastewater. The method comprises the following steps: adding high valence metal chloride into the Si-69 industrial production wastewater and constantly stirring the mixture to enable the pH value to be less than or equal to 7, so that Na2SO3 and Na2S2O3 in the wastewater can be completely converted into sodium chloride aftera reaction; guiding into a small amount of SO2 generated by a liquid caustic soda absorption reaction; adding a flocculating agent to remove an organic layer; performing evaporation and crystallization, so as to collect sodium chloride and sodium sulfate solids; recrystallizing the solids step by step, so as to separate the sodium chloride and the sodium sulfate; directly recycling mother liquor after evaporation. According to the method, raw materials are easily available, are low in cost and can be stored and transported safely and conveniently; a product after treatment can be fully utilized, so that the cost is reduced, and the production economy is improved. Meanwhile, the wastewater discharge and the influence on environment can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and relates to a treatment method for Si-69 industrial production wastewater. Background technique [0002] Si-69 wastewater mainly contains some residual products and transition layer during Si-69 liquid separation, as well as NaCl, Na 2 SO 3 、Na 2 S 2 o 3 , phase transfer catalysts (such as tetrabutylammonium bromide), etc. The direct discharge of these substances will cause great environmental pollution and waste raw materials. At present, the treatment of domestic Si-69 wastewater is mainly hydrochloric acid treatment, using hydrochloric acid and Na 2 SO 3 、Na 2 S 2 o 3 reaction to treat wastewater. Due to the use of hydrochloric acid, improper handling may easily cause secondary pollution of hydrochloric acid, and at the same time, transportation and storage of hydrochloric acid are prone to safety hazards. Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/34
Inventor 赖超帆刘峰赵荣祥马学鹏
Owner 永修县艾科普新材料有限公司
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