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Method for recycling copper metal in sludge

A technology for recycling and processing copper metal, which is applied in the field of recycling and processing copper metal in sludge to achieve the effects of improving leaching rate, improving dispersibility, reducing environmental pressure and processing pressure

Active Publication Date: 2021-08-31
GO HIGHER ENVIRONMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In related technologies, the leaching rate of acid leaching method is generally about 80-96%, which needs to be improved

Method used

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  • Method for recycling copper metal in sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: a kind of recovery processing method of copper metal in sludge, comprises the following steps:

[0038] S1: Sludge pretreatment: Dry 100-102kg of sludge in hot air until the water content of the sludge is 1-2%;

[0039] Transfer the sludge to the agitator, pour the pretreatment oil into the sludge and soak for 3 hours, and the usage amount of the pretreatment oil is 50% of the total weight of the sludge; each pretreatment oil consists of 20kg small molecule Hydroxysilicone oil and 1kg surfactant were stirred at 25°C and 100r / min; the surfactant was sodium dodecylbenzenesulfonate;

[0040] Add 25%wt inorganic salt solution to the mixer, and mix for 0.5h at 40°C and 30r / min stirring conditions to obtain the pretreated sludge; the amount of the inorganic salt solution is the same as that of the pretreatment oil agent; the inorganic salt The aqueous solution is an aqueous sodium chloride solution;

[0041] S2: Leaching: add 10%wt sulfuric acid aqueous soluti...

Embodiment 2

[0045] Embodiment 2: a kind of recovery processing method of copper metal in the sludge, and the difference of embodiment 1 is:

[0046] S1: Sludge pretreatment: drying the sludge to a water content of 4.5-5.5%;

[0047] Transfer the sludge to the agitator, pour the pretreatment oil into the sludge and soak for 1 hour, the usage amount of the pretreatment oil is 60% of the total weight of the sludge; each part of the pretreatment oil consists of 42kg small molecule Hydroxysilicone oil and 10kg of surfactant were stirred at 25°C and 100r / min; the surfactant was polysorbate 80;

[0048] Add 15%wt inorganic salt solution to the mixer, and mix for 0.6h at 40°C and 30r / min stirring conditions to obtain the pretreated sludge; the amount of the inorganic salt solution is 90% of the amount of the pretreatment oil agent; The inorganic salt solution is an aqueous sodium chloride solution;

[0049] S2: Leaching: add 25%wt sulfuric acid aqueous solution to the pretreated sludge and stir...

Embodiment 3

[0050] Embodiment 3: a kind of recycling treatment method of copper metal in sludge, and the difference of embodiment 1 is:

[0051] S1: Sludge pretreatment: drying the sludge to a water content of 19-20%;

[0052] Transfer the sludge to the agitator, pour the pretreatment oil into the sludge and soak for 0.5h, the usage of the pretreatment oil is 70% of the total weight of the sludge; each part of the pretreatment oil consists of 50kg Molecular hydroxy silicone oil and 12kg of surfactant are stirred at 25°C and 100r / min; the surfactant is sodium lauryl sulfate;

[0053] Add 20% wt of inorganic salt solution to the mixer, and mix for 1 hour at 40°C under stirring conditions of 30r / min to obtain pretreated sludge; the amount of inorganic salt solution is 110% of the amount of pretreatment oil agent; inorganic The brine solution is an aqueous solution of sodium sulfate;

[0054] S2: Leaching: add 35%wt sulfuric acid aqueous solution to the pretreated sludge and stir and mix to...

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Abstract

The invention relates to the field of metal resource recovery, and particularly discloses a method for recycling copper metal in sludge. The method for recycling copper metal in sludge comprises the following steps that S1, sludge pretreatment is conducted, specifically, after the water content of the sludge is controlled to range from 1% to 20%, the sludge is soaked in a pretreatment oil agent for 0.5-3 h, then 15%-25% wt of an inorganic salt aqueous solution is added, stirring and mixing are conducted for 0.5-1 h, and pretreated sludge is obtained; the use amount of the pretreatment oil agent is 50%-70% of the total weight of the sludge, and the use amount of the inorganic salt aqueous solution is 90%-110% of the use amount of the pretreatment oil agent; S2, leaching is conducted, and leached sludge is obtained; S3, separation is conducted, and filter residues and leachate are obtained; and S4, replacement is conducted, and copper metal is obtained; The pretreatment oil agent comprises the following components of, in parts by weight, 20-50 parts of micromolecular hydroxyl silicone oil; and 1-12 parts of a surfactant. The method can be used for recovering the copper metal in the electroplating sludge, and has the advantage of improving the leaching rate.

Description

technical field [0001] The application relates to the field of metal resource recovery, more specifically, it relates to a method for recycling copper metal in sludge. Background technique [0002] Electroplating sludge is a hazardous waste obtained from electroplating wastewater through chemical precipitation. The sludge contains a large amount of heavy metals, such as copper, nickel, zinc, iron, chromium, etc. [0003] In recent years, the resource utilization technology of electroplating sludge has been developed, especially the resource recovery technology of heavy metals. Copper metal is one of the heavy metals, and its recovery method generally adopts fire method or wet method. The main steps of wet recovery include: leaching, separation, precipitation and recovery of metal (salt); the leaching steps mainly use ammonia leaching and acid leaching. Sulfuric acid pickling. [0004] In the step of wet recovery, the leaching rate of the leaching step will directly affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/00C22B15/00
CPCC22B1/005C22B7/007C22B15/0071C22B15/0091Y02P10/20
Inventor 陈福泰郝福锦解迪
Owner GO HIGHER ENVIRONMENT GRP CO LTD