Technology for recovering production of electrolytic copper and zinc from smelting ash

Abstract

The invention discloses a technology for recovering production of electrolytic copper and zinc from smelting ash. The technology comprises a step of smelting ash leaching, a step of copper extraction and purification through copper electrodeposition, a step of iron removal through neutralization, a step of cadmium removal, and a step of zinc extraction and purification through zinc electrodeposition. The method is characterized in that chemical components in the smelting ash are analyzed, and the smelting ash is leached by a sulfuric acid solution leaching agent; the leachate obtained after the above leaching reaction undergoes a separation operation of copper extraction and purification through the copper electrodeposition; the resultant copper extraction liquor is neutralized by high-zinc dust which is a neutralizer to remove iron; cadmium is displaced and deposited by zinc powder having a mass same with cadmium after the iron removal through the neutralization; and the zinc extraction is carried out through the zinc electrodeposition by casting zinc ingot products. The technology has a wide adaptability, adopts two steps to complete the exchange reaction of zinc oxide and copper oxide in the raw material with an acid, and adopts the high-zinc dust as the neutralizer, so the massive zinc loss caused by entrainment of routine neutralizers comprising calcium oxide and sodium hydroxide is avoided. A zinc extraction liquor obtained in the above step is purified by N235, so economy and effectiveness are realized.

Description

technical field [0001] The invention belongs to the technical field of smelting, and relates to a process for recovering and producing electrolytic copper and electrolytic zinc from smelting soot by adopting wet smelting technology. Background technique [0002] Smelting soot is a solid waste produced in the process of copper pyro-smelting, which is rich in heavy metals zinc, copper, cadmium, lead, tin, and also contains a large amount of silicon, aluminum, arsenic, chlorine, fluorine, antimony, manganese, nickel, etc. Conventional hydrometallurgy zinc smelting process to treat smelting soot will encounter technical bottlenecks such as no suitable purification method for chlorine and fluorine in zinc sulfate solution, large amount of zinc powder, and high operating costs. [0003] Existing zinc hydrometallurgy processes such as: "Sichuan Nonferrous Metals" issue ISSN: 1006-4079, December 2005, "Research and Practice on Preparation of Zinc Sulphate Monohydrate from Suboxide Z...

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Problems solved by technology

[0005] The purpose of the present invention is to use solvent extraction, separation and purification process technology to solve the technical bottleneck problem of recovering zinc from smelting soot using traditional hydrometallurgy process technology, thereby providing a process for recovering and producing electrolytic zinc from smelting soot, realizing In order to recover zinc and copper at low operating cost, produce electrolytic copper cathode and electrolytic zinc products

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