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Comprehensive recovery and utilization method of non-ferrous metal smelting sewage acid and zinc-containing slag

A technology for non-ferrous metals and polluted acids, which can be applied in the direction of improving process efficiency, and can solve the problems of complex metal composition, environmental hidden dangers, and low resource recovery rate.

Active Publication Date: 2018-02-09
湖南麓云达环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex metal composition, low resource recovery rate and high recovery cost, a considerable part of valuable resources are piled up as pollutants, which brings great hidden dangers to the environment and needs to be dealt with urgently.

Method used

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  • Comprehensive recovery and utilization method of non-ferrous metal smelting sewage acid and zinc-containing slag
  • Comprehensive recovery and utilization method of non-ferrous metal smelting sewage acid and zinc-containing slag
  • Comprehensive recovery and utilization method of non-ferrous metal smelting sewage acid and zinc-containing slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The sewage acid treated in this example is taken from the acid system of a zinc smelting enterprise, and the contents of the various components of the sewage acid are shown in the following table:

[0031] Element

h 2 SO 4

As

Fe

Cd

F

Cl

Pb

Zn

Content (g / L)

60

0.3

0.05

0.6

1.5

2

0.1

0.15

[0032] Process this polluted acid with the method for sewage acid comprehensive treatment and recycling of the present invention, comprise the following steps:

[0033] Step 1: Batch the zinc-containing slag produced during the zinc smelting process of the plant, including the zinc scum floating on the surface during the ingot casting process and the secondary zinc oxide produced during the fuming process. The ingredients after batching are listed in the following table Show:

[0034] Element

Zn

In

Ag

Pb

Content (wt.%)

65

0.08

0.02

7.6

[0035] Add the zinc-...

Embodiment 2

[0043] The sewage acid treated in this example is taken from the acid system of a zinc smelting enterprise, and the contents of the various components of the sewage acid are shown in the following table:

[0044] Element

h 2 SO 4

As

Fe

Cd

F

Cl

Pb

Zn

Content (g / L)

60

0.3

0.05

0.6

1.5

2

0.1

0.15

[0045] Process this polluted acid with the method for sewage acid comprehensive treatment and recycling of the present invention, comprise the following steps:

[0046] Step 1: Batch the zinc-containing slag produced during the zinc smelting process of the plant, including the zinc scum floating on the surface during the ingot casting process and the secondary zinc oxide produced during the fuming process. Ingredients shown:

[0047] Element

Zn

In

Ag

Pb

Content (wt.%)

65

0.08

0.02

7.6

[0048] Add the zinc-containing slag material after batching to 1m 3 In ...

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PUM

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Abstract

Disclosed is a comprehensive recycling method for non-ferrous metal metallurgy acidic wastewater and zinc-containing residues. The zinc-containing residues generated in the zinc smelting production process serve as an acidic wastewater neutralizer. Liquid obtained after neutralization is subjected to fluorine and chlorine removal and concentrated to meet the requirements for a zinc sulfate solution of a zinc system, and then directly enters the electrolytic zinc system. Valuable metal such as arsenic, cadmium and copper in the acidic wastewater is recycled through an impurity purification procedure of the zinc system. The zinc-containing residues are subjected to a neutralization step to be recycled and fed into a lead extraction procedure after being enriched with lead, silver and other metal. The filter residues with fluorine and chlorine removed are regenerated with a sodium hydroxide solution, the residues obtained after regeneration can be used for the fluorine and chlorine removal procedure repeatedly, and sodium fluoride, sodium chloride and sodium hydroxide in the liquid obtained after regeneration are separated and recycled through efficient evaporative crystallization. The comprehensive recycling method for non-ferrous metal metallurgy acidic wastewater and zinc-containing residues is based on an existing zinc hydrometallurgy system, the balance of original materials in the system is maintained, and an additional heavy metal impurity purification procedure is not added. The comprehensive recycling method for non-ferrous metal metallurgy acidic wastewater and zinc-containing residues is short in process, low in cost, high in valuable metal recycling rate, free of discharging of secondary waste residues and waste water and good in comprehensive economical benefit.

Description

technical field [0001] The invention discloses a comprehensive recycling method for non-ferrous metal smelting dirty acid and zinc-containing slag, in particular to a method for comprehensively recycling dirty acid produced in a lead and zinc smelting flue gas sulfuric acid production system and zinc-containing slag produced in the process of zinc smelting zinc A method of recycling valuable resources. It belongs to the technical field of nonferrous metal smelting. Background technique [0002] Lead sulfide and zinc concentrates can produce high concentrations of sulfur dioxide (SO 2 ≥6%) flue gas to produce sulfuric acid, a large amount of dirty acid will be produced in the purification process of the acid system, which contains zinc, cadmium, copper, lead, antimony and other heavy metal ions and arsenic, fluorine, chloride ions. Taking a 50Kt / a conventional process zinc smelter as an example, the actual waste acid produced is 120m 3 / d~150m 3 / d, acid concentration 5% ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04
CPCC22B7/007C22B7/04Y02P10/20
Inventor 刘晓剑陈春发
Owner 湖南麓云达环境科技有限公司
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