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Process for treating alkaline sewage

A technology for sewage treatment and alkaline sewage, applied in the direction of chilled water/sewage treatment, centrifuged water/sewage treatment, alkali metal compounds, etc., can solve environmental pollution and other problems, and achieve the effect of eliminating pollution

Inactive Publication Date: 2002-09-18
柳云珍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no effective treatment method for the above-mentioned alkaline sewage, and most of them are discharged directly, which pollutes the environment very seriously. The relevant manufacturers are also ordered to stop production due to the direct discharge of alkaline sewage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] ①Separate the alkaline sewage through precision filtration or separation equipment to remove impurities;

[0012] ②Put the alkaline sewage into the crystallizer whose temperature is kept in the range of -20℃~10℃, crystallize for about 48 hours, and let it fully crystallize;

[0013] ③Take out the material in the crystallizer and put it into a centrifuge for centrifugal separation. The centrifuged material is sodium metasilicate nonahydrate. Concentrate the mother liquor discharged by centrifugation to a sodium hydroxide content of 34%, put it into a sedimentation tank for precipitation, and take out the supernatant liquid, that is, the sodium hydroxide content is about 34% liquid caustic soda.

Embodiment 2

[0015] ①Separate the alkaline sewage through precision filtration or separation equipment to remove impurities;

[0016] ②Put the alkaline sewage into the crystallizer whose temperature is kept in the range of -20℃~10℃, crystallize for about 48 hours, and let it fully crystallize;

[0017] ③Take out the material in the crystallizer and put it into a centrifuge for centrifugal separation. The centrifuged material is sodium metasilicate nonahydrate. Concentrate the mother liquor discharged by centrifugation to a sodium hydroxide content of 34%, and put it into a precipitation tank for precipitation. ③ Take out the supernatant liquid and put it into the evaporator, concentrate until the temperature reaches 300--320°C, put it into the caustic soda machine, and then produce flake caustic soda.

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PUM

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Abstract

A process for treating alkaline sewage generated in preparing Zr chemicals includes concentrating, cooling, cystallizing to obtain nonahydrated sodium metasilicate, concentrating residual alkali solution and preparing liquid solution hydroxide or solid alkali.

Description

technical field [0001] The invention provides a process for treating sewage produced by molten alkali or caustic soda in the production of zirconium chemical series products, belonging to the technical field of sewage treatment and utilization. Background technique [0002] In the process of producing zirconium chemical series products, zircon sand is mixed with caustic soda or soda ash, sintered or alkali-fused to obtain alkali-fused or sintered material, and the production process requires that the alkali-fused or sintered material be washed with water to remove silicon Sodium acid and excess caustic soda, thus producing a large amount of alkaline sewage. At present, there is no effective treatment method for the above-mentioned alkaline sewage, and most of them are directly discharged, which seriously pollutes the environment, and related manufacturers are also ordered to stop production due to the direct discharge of alkaline sewage. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D1/30C01D1/42C01D13/00C02F1/22C02F1/38
Inventor 柳云珍宋世楼贾欲雪
Owner 柳云珍
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