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Method for recovering copper, zinc and nickel from heavy metal sludge by using copper smelting waste acid

A technology for smelting heavy metal sludge and copper, applied in the field of recovering copper, nickel metal and zinc, can solve the problems of high impurity content of black copper and crude nickel sulfate, inability to reflect the metal value well, and ineffective utilization of valence metals, etc. Considerable metal recovery value, reducing the risk of environmental pollution, and good overall connection

Active Publication Date: 2016-04-20
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method has the following four problems: (1) Deep decopper and nickel concentration and precipitation need to consume a lot of electricity and heat energy
(2) The obtained black copper and crude nickel sulfate have high impurity content and can only be treated as cheap raw materials, and the metal value is often not well reflected
(3) The concentrated waste acid can only be treated cheaply as a low-priced acid, and a large amount of valuable metals in it cannot be effectively utilized
(4) The handling process will also inevitably have an impact on the environment
[0004] CN103422119A discloses "a method for producing cathode copper from copper-containing sludge", and CN1837381A discloses "an efficient process for extracting fine nickel from waste electrolyte". These methods only carry out metal extraction and refining for a single waste, using The comprehensive utilization of multiple metals recovered step by step from copper smelting waste acid from metal sludge has not been reported

Method used

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  • Method for recovering copper, zinc and nickel from heavy metal sludge by using copper smelting waste acid
  • Method for recovering copper, zinc and nickel from heavy metal sludge by using copper smelting waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] according to figure 1 The process shown is carried out.

[0039] The contents of main metal ions in copper smelting waste acid and heavy metal sludge in this example are shown in Table 1.

[0040]Main element content in copper smelting waste acid and heavy metal sludge in Table 1 Example 1

[0041] metal element

Cu

Zn

Ni

Fe

Cr

Cd

As

Content in copper smelting waste acid g / L

3.3

0.97

20.52

0.56

0.0019

0.0024

0.35

3 --> Content in heavy metal sludge g / kg

52.3

97.0

8.7

14.2

0.1

0.2

0.2

[0042] Note: The water content of the sludge sample is 80.4%, and the concentration of sulfuric acid in the copper smelting waste acid is 223g / L.

[0043] (1), leaching

[0044] Take the above heavy metal sludge with a water content of 80.4%, use copper smelting waste acid as the leaching agent, control the liquid-solid mass ratio to 10:1 for leaching operation, stir and react...

Embodiment 2

[0059] The contents of main metal ions in copper smelting waste acid and heavy metal sludge in this example are shown in Table 2.

[0060] Contents of major elements in copper smelting waste acid and heavy metal sludge in Table 2 Example 2

[0061] metal element

Cu

Zn

Ni

Fe

Cr

Cd

As

Content in copper smelting waste acid g / L

3.5

0.86

18.43

0.62

0.0017

0.0019

0.33

Content in dry sludge g / kg

48.3

82.0

6.7

12.2

0.1

0.2

0.2

[0062] Note: The water content of the sludge sample is 81.2%, and the concentration of sulfuric acid in the copper smelting waste acid is 219g / L.

[0063] (1), leaching

[0064] Take the above heavy metal sludge with a water content of 81.2%, use copper smelting waste acid as the leaching agent, control the liquid-solid mass ratio to be 12:1 for leaching operation, stir and react at room temperature for 3 hours, and the stirring rate is 100r / min; P...

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Abstract

The invention relates to a method for recovering copper zinc nickel from heavy metal sludge by using copper smelting waste acid, which comprises the following steps: 1)leaching; 2)purifying and removing impurity; 3)extracting copper and electrically depositing copper; 4)neutralizing and removing iron; %)extracting zinc, neutralizing and purifying a zinc strip liquor, and electrically depositing zinc; 6)extracting nickel, electrically depositing nickel; and depositing alkali. According to the invention, valuable metals such as copper, zinc and nickel can be recovered step by step from the heavy metal sludge by using the copper smelting waste acid, the comprehensive recovery can reach 97%, the sewage and sludge can reach a discharge standard, and the obtained product can be directly taken as a raw material of the copper material for reuse. According to the method, the localization treatment of the dangerous waste can be realized, and the method and has economic, environmental and social benefits and wide application prospect.

Description

technical field [0001] The invention relates to a method for recovering copper, zinc and nickel metals from heavy metal-containing sludge by using copper smelting waste acid. Background technique [0002] During the copper production process, some metal-containing dust and compounds will enter the circulating water system and finally accumulate in the water treatment sludge. Heavy metals in sludge exist in the form of hydroxides, which can easily enter the soil and water bodies. Improper storage will affect the surrounding environment and cause secondary pollution. At the same time, a large amount of valuable metals such as copper, zinc, and nickel are also lost, causing resource pollution. waste. With the shortage of metal resources and the emphasis on environmental issues, more and more attention has been paid to the recycling of waste. [0003] The copper smelting waste acid produced in the copper smelting process also faces the same problems of metal loss and environme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B19/20C22B23/00C22B15/00
CPCY02P10/20
Inventor 洪燮平傅杰邵德忠
Owner JINTIAN COPPER GROUP CORP NINGBO
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