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A method for recovering copper and arsenic from copper fumes and solidifying them into scorodite

A technology for scorodite and copper recovery

Active Publication Date: 2018-03-27
云南云铜锌业股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for recovering copper and arsenic from copper fumes and solidifying them into scorodite, aiming at solving the problems of low recovery rate, high recovery cost and potential environmental protection hazards in the existing process. question

Method used

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  • A method for recovering copper and arsenic from copper fumes and solidifying them into scorodite
  • A method for recovering copper and arsenic from copper fumes and solidifying them into scorodite

Examples

Experimental program
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Embodiment 1

[0053] 1). Acid leaching the copper fumes to obtain an acid leaching solution. Take 700g of copper fume (Fe is 2~12%, As is 4~12%, Cu is 3~6%, Zn is 7~10%, Pb is 15~26.49%), according to the liquid-solid ratio (mL:g) It is 5.7:1, and the acidity of sulfuric acid is 30g / L, at room temperature (18~22°C), and the reaction time is 2h. The leaching indicators are: the leaching rate of zinc from slag is 97.54%, the leaching rate of copper is 82.83%, and the leaching rate of arsenic is 73.05%.

[0054] 2). At 140°C, the mass ratio of iron to arsenic is 1.5:1, the arsenic concentration is 18g / l, the pH is 4.5, the copper ion concentration is 0.1g / L, the zinc concentration is 75 g / L, and the oxygen partial pressure is 1.3 Under the conditions of MPa and reaction time of 2 hours, scorodite was obtained by oxygen pressure precipitation of arsenic in acid leaching solution. Oxygen pressure arsenic precipitation indicators: copper precipitation rate 0.6%, arsenic precipitation rate 66%, ...

Embodiment 2

[0057] 1). Acid leaching the copper fumes to obtain an acid leaching solution. Take 700g of copper fume (Fe is 2~12%, As is 4~12%, Cu is 3~6%, Zn is 7~10%, Pb is 15~26.49%), according to the liquid-solid ratio (mL:g) It is 5.7:1, and the acidity of sulfuric acid is 22g / L, at room temperature (18~22°C), and the reaction time is 1.5h. The leaching indicators are: the leaching rate of zinc from slag is 91%, the leaching rate of copper is 78.21%, and the leaching rate of arsenic is 65.29%.

[0058] 2). At 150°C, the mass ratio of iron to arsenic is 1, the concentration of arsenic is 5g / l, the acidity of sulfuric acid is 10g / L, the concentration of copper ions is 2g / L, the concentration of zinc is 30 g / L, and the partial pressure of oxygen is 0.7MPa. Under the condition that the reaction time is 2.5 hours, the acid leaching solution is subjected to oxygen pressure precipitation to obtain scorodite. Indicators for oxygen pressure precipitation of arsenic: the precipitation rate of...

Embodiment 3

[0061] 1). Acid leaching the copper fumes to obtain an acid leaching solution. Take 700g of copper fume (Fe is 2~12%, As is 4~12%, Cu is 3~6%, Zn is 7~10%, Pb is 15~26.49%), according to the liquid-solid ratio (mL:g) It is 5.7:1, and the acidity of sulfuric acid is 14g / L, at room temperature (18~22°C), and the reaction time is 2h. The leaching indicators are: the leaching rate of zinc from slag is 86%, the leaching rate of copper is 76%, and the leaching rate of arsenic is 58.23%.

[0062] 2). At 160°C, the mass ratio of iron to arsenic is 2, the concentration of arsenic is 30g / l, the acidity of sulfuric acid is 20g / L, the concentration of copper ions is 8g / L, the concentration of zinc is 75 g / L, and the partial pressure of oxygen is 0.1 Under the conditions of MPa and reaction time of 3 hours, scorodite was obtained by oxygen pressure precipitation of arsenic in acid leaching solution. Indicators for oxygen pressure precipitation of arsenic: the precipitation rate of copper...

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Abstract

The invention discloses a method for recovering copper from copper dust and immobilizing arsenic from copper dust into scorodite. The method comprises the following steps: subjecting the copper dust to acid leaching under the conditions that a sulfuric acid concentration is 14 to 30 g / L and reaction time is 2 to 3 h so as to obtain acidic leaching liquid; carrying out oxygen-pressure arsenic precipitation on acidic leaching liquid under the conditions that oxygen partial pressure is 0.6 to 1.3 MPa and reaction time is 2 to 3 h so as to obtain scorodite and a post-arsenic-precipitation solution; and adding iron powder into the post-arsenic-precipitation solution and carrying out a reaction for 25 to 40 min so as to displace copper slag and obtain post-displacement liquid. The method provided by the invention carries out oxidative arsenic precipitation at a high temperature, so sulfuric acid in waste acidic leaching liquid is made full use of; a high arsenic removal rate is realized, eventually produced iron arsenate has stable properties, and the post-arsenic-precipitation solution has low arsenic content; and the method has the advantages of high heavy metal recovery rate, low recovery cost, environment-friendly treatment process and small pollution to the environment.

Description

technical field [0001] The invention relates to the field of nonferrous metallurgy industry, in particular to a method for recovering copper and arsenic from copper fumes and solidifying them into scorodite. Background technique [0002] The smoke and dust produced in the non-ferrous metallurgical industry mainly comes from the smelting, roasting or waste residue fuming recovery process of arsenic-containing ores in the extraction of heavy metals such as copper, lead, zinc, cobalt, and tin. Among them, copper fume contains Cu, Pb, Zn, Bi and more than 9 kinds of valuable metals, and its chemical composition is complex. If the copper fume is directly returned to the copper smelting system, it will not only greatly increase the impurity content of the incoming raw materials, deteriorate the furnace condition, and reduce the processing capacity of the furnace, but also the cyclic accumulation of As, Bi, Zn and other impurities will directly affect the quality of electrical copp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B15/00C01G49/00
CPCY02P10/20
Inventor 戴兴征曾鹏陈国木黄孟阳李国峰李永祥王秋银张浩杰姜艳王娜
Owner 云南云铜锌业股份有限公司
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