Method for processing waste acid generated in process of preparing acid from metal smelting fume

A technology for producing acid from flue gas and metal smelting, which is applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc. The problems of large consumption of material lime and complex process flow can achieve the effect of reducing the labor intensity of the post, reducing the incidence and simple process.

Inactive Publication Date: 2011-07-06
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the treatment effect of this process route has been improved, the process flow is complex, especially the calcareous material lime consumption as a neutralizing agent is large, resulting in high treatment costs, which has become the main factor affecting the industrial application of this process. Economic feasibility for industrial applications
[0010] On the other hand, in the production process of calcium carbide, after hydrolysis of calcium carbide to obtain acetylene gas, a large amount of waste residue with calcium hydroxide as the main component is produced. Carbide mud is calcium carbide slag with a water content higher than 50%, which has a large output and strong alkalinity. The price is cheap, and the effective CaO content in calcium carbide mud is about 60%, which can be used as a calcium substitute, but has not been used in this field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention is applied to an acid production system with an annual output of 220,000 tons. This system utilizes the sulfur dioxide contained in the flue gas after the zinc concentrate fluidized furnace roasts to produce sulfuric acid. Production of sulfuric acid with a concentration of 93% and sulfuric acid with a concentration of 98%; all the sewage acid produced by the system is sent to the sewage acid treatment device for treatment, and then discharged after further treatment by the water treatment device.

[0029] The composition and concentration of the sewage acid to be treated are:

[0030]

h 2 SO 4

%

As

mg / L

Cu

mg / L

Cd

mg / L

Hg

mg / L

Pb

mg / L

Zn

mg / L

content

6

100

10

120

100

100

300

[0031] Adopt calcium carbide mud-sulfurization method to process above-mentioned polluted acid, comprise vulcanization, neutralization step, all the o...

Embodiment 2

[0034] The present invention is applied to an acid production system with an annual output of 100,000 tons. The system utilizes tail gas containing sulfur dioxide after the lead concentrate sintering process to produce sulfuric acid, and directly condenses and produces sulfuric acid with a concentration of 97% after the power wave purification process. All the generated sewage acid is sent to the sewage acid treatment device for treatment, and then is further treated by the water treatment device before being discharged.

[0035] The composition and concentration of the sewage acid to be treated are:

[0036]

h 2 SO 4

%

As

mg / L

Cu

mg / L

Cd

mg / L

Hg

mg / L

Pb

mg / L

Zn

mg / L

content

2

50

5

50

60

50

350

[0037] Adopt calcium carbide mud-sulfurization method to process above-mentioned polluted acid, comprise vulcanization, neutralization step, all the other steps...

Embodiment 3

[0040] The present invention is applied to an acid production system with an annual output of 100,000 tons. This system utilizes the sulfur dioxide contained in the flue gas after zinc concentrate fluidized furnace roasting to produce sulfuric acid. Sulfuric acid with a concentration of 93% and sulfuric acid with a concentration of 98%; all the sewage acid generated by the system is sent to the sewage acid treatment device for treatment, and then discharged after further treatment by the water treatment device.

[0041] The composition and concentration of the sewage acid to be treated are:

[0042]

h 2 SO 4

%

As

mg / L

Cu

mg / L

Cd

mg / L

Hg

mg / L

Pb

mg / L

Zn

mg / L

content

1

30

1

30

1

30

200

[0043] Adopt calcium carbide mud-sulfurization method to process above-mentioned polluted acid, comprise vulcanization, neutralization step, all the other steps are carrie...

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PUM

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Abstract

The invention relates to a method for processing waste acid generated during preparing acid from fume generated in the smelting process of metal sulphide ore. In the method, the waste acid generated in process of preparing the acid from the metal smelting fume is processed by adopting a ferrous sulfate-lime neutralization method. The method comprises a sulfuration step and a neutralization step and is characterized in that a neutralizer used in the neutralization step is calcium carbide neutralizer slurry prepared from calcium carbide. In the invention, improvement is carried out aiming at the problems that in industrial application, the ferrous sulfate-lime neutralization method is large in the consumption of the calcium material lime of the neutralizer and high in processing cost; through fully utilizing the characteristic that the content of effective CaO in carbide slag is high, the carbide slag is used as a calcium material to replace the lime, thereby greatly reducing the cost, achieving the environment-friendly effect of treating the waste liquid by utilizing the waste slag, creating a novel way for use of calcium carbide and achieving the purpose of using wastes to treat wastes.

Description

technical field [0001] The invention relates to a method for treating by-products of metal smelting, in particular to a method for treating dirty acid produced by producing acid from metal sulfide ore smelting flue gas. Background technique [0002] During the smelting process of metal sulfide ore, a large amount of flue gas will be produced, which contains a large amount of sulfur dioxide and some harmful metal components. From the perspective of environmental protection and comprehensive utilization, in industrial production, generally according to the flue gas SO 2 Concentrations are different using different treatment processes, when SO 2 When the concentration is less than 2.5%, the method of flue gas desulfurization (FGD) is generally required for treatment. When SO 2 When the concentration is 2.5%~3.5%, SO 2 Flue gas can be directly used to produce sulfuric acid. There are currently two main processes, one is low-concentration SO 2 Unsteady conversion process, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F101/20
Inventor 刘宁波龙钦李云新肖康钟浩刘智能
Owner ZHUZHOU SMELTER GRP
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