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Method of water treatment process

A water treatment and process technology, applied in the field of sewage treatment in the hydrometallurgical zinc smelting process, can solve the problems of high sulfur content in slag, high desulfurization cost, large consumption of filter cloth, etc. Low dosage effect

Inactive Publication Date: 2018-11-23
四川四环锌锗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using Na 2 The use of S to produce sediment has the following disadvantages: poor filtration performance, high consumption of filter cloth, high sulfur content in slag (9.15%), high sulfide in primary drainage, etc.; and the tail gas produced by the treatment slag contains SO 2 Large amount, high cost of desulfurization

Method used

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  • Method of water treatment process

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Embodiment 1

[0024] The present embodiment provides a method for water treatment process, comprising the following steps:

[0025] (1) Add lime milk supernatant to the acidic wastewater containing heavy metals, adjust the pH value to 7.0, until the precipitation stops; then filter and separate the precipitation to obtain the first filtrate with waste residue left at the bottom;

[0026] (2) Add lime milk supernatant again in the first filtrate, adjust the pH value to be 8.5, to stop producing precipitation; Then add Na in the filtrate 2 S, Na 2 The weight ratio of the amount of S added to the heavy metal in the first waste liquid is 1.3:1, until the precipitation stops again; then filter and separate the precipitate in the first filtrate to obtain the second filtrate with waste residue left at the bottom; The second filtrate is subjected to biochemical treatment to obtain purified water.

Embodiment 2

[0028] The present embodiment provides a method for water treatment process, comprising the following steps:

[0029] (1) Add lime milk supernatant to acid waste water containing heavy metals, adjust the pH value to 8.0, until the precipitation stops; then filter and separate the precipitation to obtain the first filtrate with waste residue left at the bottom;

[0030] (2) Add lime milk supernatant again in the first filtrate, adjust the pH value to be 8.5, to stop producing precipitation; Then add Na in the filtrate 2 S, Na 2 The weight ratio of the amount of S added to the heavy metal in the first waste liquid is 1.3:1, until the precipitation stops again; then filter and separate the precipitate in the first filtrate to obtain the second filtrate with waste residue left at the bottom; The second filtrate is subjected to biochemical treatment to obtain purified water.

Embodiment 3

[0032] The present embodiment provides a method for water treatment process, comprising the following steps:

[0033] (1) Add lime milk supernatant to acid waste water containing heavy metals, adjust the pH value to 7.5, until the precipitation stops; then filter and separate the precipitation to obtain the first filtrate with waste residue left at the bottom;

[0034] (2) Add lime milk supernatant again in the first filtrate, adjust the pH value to be 8.5, to stop producing precipitation; Then add Na in the filtrate 2 S, Na 2 The weight ratio of the amount of S added to the heavy metal in the first waste liquid is 1.3:1, until the precipitation stops again; then filter and separate the precipitate in the first filtrate to obtain the second filtrate with waste residue left at the bottom; The second filtrate is subjected to biochemical treatment to obtain purified water.

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Abstract

The invention belongs to the technical field of sewage treatment in zinc hydrometallurgy process, and provides a method of water treatment process. The method comprises the following steps: (1) addinga neutralizing agent to acidic wastewater containing heavy metals to adjust the pH value to 7.0 to 8.0 till the reaction stops and precipitates are generated, and then filtering to separate the precipitates to obtain first filtrate with residue at the bottom; (2) adding a neutralizing agent to the first filtrate again to adjust the pH value to 8.0 to 9.0 till the reaction stops and precipitates are generated, then adding Na2S to the filtrate till the reaction stops and precipitates are generated, wherein the weight ratio of Na2S added to heavy metals in the first filtrate is (1.2-1.5) to 1, and finally, filtering to separate the precipitates in the first filtrate, so as to obtain second filtrate with residue at the bottom. The method is highly efficient, the consumption of a precipitatingagent is small, the degree of purification is deep, and the amount of residue is small, and thus the method is suitable for large-scale industrial treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in a zinc hydrometallurgy process, and in particular relates to a water treatment process method. Background technique [0002] In the process of zinc hydrometallurgy, water is used in large quantities. It is mainly used for washing roasting flue gas, hydrometallurgy, washing slag, washing slag, washing equipment and floors, and cooling production equipment, etc., so there will be generated in the production process A lot of waste water. The heavy metals contained in wastewater mainly include zinc, lead, copper, cadmium, mercury, arsenic, antimony, nickel, cobalt, etc., and the acid contained is sulfuric acid. Metal-containing wastewater is discharged into natural water bodies, which increases the heavy metals and their salts in the water. When the concentration exceeds a certain limit, it will cause pollution accidents due to its toxicity. [0003] The traditional treatment of sewage g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/16
CPCC02F1/001C02F1/52C02F1/5236C02F1/66C02F9/00C02F2101/20C02F2103/16
Inventor 曾维泉
Owner 四川四环锌锗科技有限公司
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