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Method for recovering metallic copper and zinc from copper smelting ash

A technology for smelting soot and metallic copper from copper, which can be applied to the improvement of process efficiency, photography process, instruments, etc., and can solve the problems of high cost and large amount of zinc powder.

Inactive Publication Date: 2011-10-12
江西南城鑫业环保处置有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a huge amount of zinc powder used to treat recycled copper soot, resulting in high cost; and the obtained copper-zinc slag needs to be further separated from copper and zinc.

Method used

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  • Method for recovering metallic copper and zinc from copper smelting ash
  • Method for recovering metallic copper and zinc from copper smelting ash
  • Method for recovering metallic copper and zinc from copper smelting ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A by-product of a secondary copper smelter is brass re-smelting ash, material composition (%): Zn 47.26, Pb 0.96, Cu 20.21, Ni 0.21, S 3.2, Cd 0.026, Fe 0.71, As 0.0042.

[0052] Using Zn(II)-NH 4 Cl-NH 3 The waste electrolyte of zinc electrowinning in the system is used as a leaching agent after mixing, containing Zn 2+ 12g / L, NH 4 Cl5.0mol / L, NH 3 2.5mol / L, leaching copper and zinc from copper smelting soot at room temperature, the solid-liquid ratio is 100g / L, and the leaching time is 0.5h.

[0053] The solution obtained after filtration and separation contains (g / L): Zn 2+ 58.56, Cu 2+ 19.85, Ni 2+ 0.18, Cd 2+ 0.02, Pb 2+ 0.058L. Using 30% LIX-84-IT kerosene as the extraction agent, at room temperature, O / A is 1.5 / 1.0, and the extraction order is 3, copper is selectively extracted from the leachate; the loaded organic phase is washed in two stages, O / A=50 / 1; then use Cu 2+ 12.1g / L, H 2 SO 4 220g / L of waste electrolyte stripping copper, O / A=3 / 1 strippin...

Embodiment 2

[0058] A factory brass recycled soot, material composition (%): Zn 50.93, Pb 2.21, Cd 0.40, Fe 1.05, Cu 12.88, Ni 0.24, As 0.0051.

[0059] Newly configured NH 4 Cl-NH 3 The solution is a leaching agent, containing Zn 2+ 0g / L, NH 4 Cl 5.5mol / L, NH 3 2.0mol / L, stirring and leaching copper and zinc from copper smelting soot at room temperature, the solid-liquid ratio is 120g / L, and the leaching time is 1.0h.

[0060] After filtration and separation, the liquid (g / L) contains: Zn 2+ 60.58, Cu 2+ 14.46, Ni 2+ 0.24, Cd 2+ 0.41, Pb 2+ 0.018. Using 30% LIX-84-IT kerosene as the extraction agent, extract copper from the leaching solution under the conditions of normal temperature, O / A ratio of 1 / 1, and extraction stages of 2. The loaded organic phase is washed in two stages, O / A = 30 / 1; then use the newly prepared sulfuric acid solution to strip copper, and the newly prepared solution contains H 2 SO 4 250g / L, O / A=4 / 1, stripping to get Cu-containing 2+ 57.6g / L solution, e...

Embodiment 3

[0065] Copper converter soot in a factory, material composition (%): Cu 2.98, Zn 9.39, Pb 22.31, Bi 1.85, Fe 8.52, Cd 0.64, Fe 1.05, As 2.89, In ​​0.035.

[0066] Using Zn(II)-NH 4 Cl-NH 3 The waste electrolyte of zinc electrowinning in the system is used as a leaching agent, containing Zn 2+ 20.0g / L, NH 4 Cl5.5mol / L, NH 3 2.0mol / L, solid-liquid ratio is 300g / L, after stirring and leaching at room temperature for 2.5h, the supernatant is open-circuited to recover copper and zinc; the underflow is added with leaching agent and then ball milled for 0.5h, and the filtered solution is returned to stir to leach soot.

[0067] Liquid composition after filtration and separation (g / L): Zn 2+ 45.91, Cu 2+ 8.96, Ni 2+ 0.26, Cd 2+ 1.77, Pb 2+ 0.008, As 3+ 0.003. Using 10% LIX-84-IT kerosene as the extraction agent, extract copper from the leaching solution at room temperature, O / A is 2 / 1, and the extraction stage is 1; the loaded organic phase is washed in two stages, O / A =10 / ...

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Abstract

The invention discloses a method for recovering metallic copper and zinc from copper smelting ash, comprising the following steps of: by using a NH4Cl-NH3 solution as a leaching agent, leaching copper and zinc from copper smelting ash at normal temperature; after filtering and separating, selectively extracting copper by using an extraction agent LIX-84-IT; after washing load organic phase, back extracting copper by using a solution containing 120-250 g / L of sulfuric acid, wherein the back extraction solution is used for electro-deposition production of copper; performing two-section counter-current replacement of the copper extraction residual solution at normal temperature by using zinc powder; producing metallic zinc from the obtained Zn(II)-NH3-NH4Cl solution through an electro-deposition method; and after preparing the zinc electro-deposition waste solution, returning the leached ash. The method is simple in process and easy to operate. Products are high-value metals, can be sold easily and have other advantages. The method can be used for widely treating various types of copper smelting ashes containing copper and zinc.

Description

technical field [0001] The method for recovering metallic copper and zinc from copper smelting soot disclosed by the invention belongs to the fields of secondary resource recovery and nonferrous metal hydrometallurgy. Background technique [0002] During the copper smelting process, some soot containing copper and zinc will be produced, such as copper converter soot, brass re-smelting ash, brass re-smelting soot, etc., which have high recovery value. [0003] Yao Genshou of Tongling Nonferrous Metals Company (Yao Genshou. The practice of producing zinc sulfate heptahydrate from copper converter soot. Nonferrous Smelting, 2003, (3): 41-43) adopted leaching → copper removal → iron and arsenic removal → deep iron and arsenic removal → cadmium removal →Crystalization→Separation production process, processing copper smelting converter soot, producing sponge cadmium and zinc sulfate heptahydrate, the process is long and only chemical products and copper slag can be obtained. An S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/14C22B3/40C25C1/12C25C1/16
CPCY02P10/20
Inventor 杨声海邓小林陈永明何静张志明唐谟堂周美根
Owner 江西南城鑫业环保处置有限公司
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