Green utilization method of waste acid

A polluted acid and green technology, applied in the chemical and metallurgical fields, can solve the problems of difficult extraction of gypsum, long industrial process, waste of resources, etc., and achieve the effects of cost reduction, short process flow and good economic benefits.

Active Publication Date: 2014-02-19
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method produces a large amount of slag, consumes a large amount of calcium carbide mud and the gypsum generated at the same time as the slurry is not easy to extract, the industrial process is long, and it causes waste of resources

Method used

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  • Green utilization method of waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Put 2 m of dirty acid into the neutralization tank 3 , Add 300 kg of zinc oxide powder into the neutralization tank, control the pH value of the neutralization tank to 4, and the temperature to 42°C, and keep stirring to make it fully react.

[0022] (2) The neutralized slag after being filtered by the filter press is sent to the next stage of the process to recover the valuable metals, and the neutralized liquid is introduced into the purification tank.

[0023] (3) After the neutralized liquid enters the purification tank, keep a constant temperature of 45°C, add 2 kg of zinc powder into the purification tank, and keep stirring to make it fully react.

[0024] (4) The purified slag after being filtered by the filter press is sent to the next stage of the process to recover the valuable metals in it, and the purified liquid is introduced into the arsenic sink.

[0025] (5) After the purified liquid enters the arsenic precipitation tank, add 80 kg of ferrous sulfat...

Embodiment 2

[0029] (1) Put 4 m of dirty acid into the neutralization tank 3 , Add 900 kg of zinc oxide powder into the neutralization tank, control the pH value of the neutralization tank to 5, and the temperature to 43°C, and keep stirring to make it fully react.

[0030] (2) The neutralized slag after being filtered by the filter press is sent to the next stage of the process to recover the valuable metals, and the neutralized liquid is introduced into the purification tank.

[0031] (3) After the neutralized liquid enters the purification tank, keep a constant temperature of 48°C, add 6 kg of zinc powder into the purification tank, and keep stirring to make it fully react.

[0032] (4) The purified slag after being filtered by the filter press is sent to the next stage of the process to recover the valuable metals in it, and the purified liquid is introduced into the arsenic sink.

[0033] (5) After the purified liquid enters the arsenic precipitation tank, add 300 kg of ferrous sulfa...

Embodiment 3

[0037] (1) Put 10 m of dirty acid into the neutralization tank 3 , Add 2000 kg of zinc oxide powder into the neutralization tank, control the pH value of the neutralization tank to 6, and the temperature to 45°C, and keep stirring to make it fully react.

[0038] (2) The neutralized slag after being filtered by the filter press is sent to the next stage of the process to recover the valuable metals, and the neutralized liquid is introduced into the purification tank.

[0039] (3) After the neutralized liquid enters the purification tank, keep a constant temperature of 50°C, add 20 kg of zinc powder into the purification tank, and keep stirring to make it fully react.

[0040] (4) The purified slag after being filtered by the filter press is sent to the next stage of the process to recover the valuable metals in it, and the purified liquid is introduced into the arsenic sink.

[0041] (5) After the purified liquid enters the arsenic sink, add 1,000 kg of ferrous sulfate solid ...

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Abstract

The invention discloses a green utilization method of a waste acid, and belongs to the fields of the metallurgy and the chemical industry. The method comprises the following steps: adding zinc oxide powder to neutralize sulfuric acid in the waste acid and generate zinc sulfate; adding zinc powder to replace heavy metal ions comprising lead ions, cadmium ions, copper ions and the like in the waste acid to enrich most heavy metals in the waste acid; adding ferrous sulfate to precipitate arsenic, and utilizing the strong adsorption and flocculation capability characteristics of hydroxide of iron to further remove a small amount of harmful heavy metal ions comprising lead ions, cadmium ions, copper ions and the like residual in the waste acid; and carrying out concentrating crystallization, centrifugation and drying of an arsenic-precipitated filtrate to obtain zinc sulfate heptahydrate. The method has the advantages of short process flow, reduction of the waste acid treatment cost of traditional methods, economic benefit and good application prospect.

Description

technical field [0001] The invention relates to the fields of metallurgy and chemical industry. Specifically, it relates to a green utilization method of polluted acid. Background technique [0002] During the smelting of copper, lead and zinc, a large amount of flue gas will be produced, including a large amount of SO 2 and some harmful metal components. From the perspective of environmental protection and comprehensive utilization, most copper, lead, and zinc smelters have built two-to-two-suction acid production systems to realize smoke and dust recovery and SO 2 Acid production from flue gas. However, in this process, a large amount of strongly acidic wastewater containing heavy metals will be produced, referred to as dirty acid. The composition of polluted acid is complex; the acidity is high and the composition is complex, except H 2 SO 4 In addition, it also contains arsenic, cadmium, lead and other heavy metals; and the concentration of heavy metals is high and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06
Inventor 黄海飞谢兆凤刘万里柴承平覃小龙谭霖
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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