Technology for recovering production of electrolytic zinc powder and lead powder from smelting ash through alkali leaching method

Abstract

The invention discloses a technology for the recovering production of electrolytic zinc powder and lead powder from smelting ash through an alkali leaching method. The technology comprises a step of copper removal of lead powder, a step of ingot casting for lead removal through electrodeposition, a step of lead removal through using sodium sulfide, a step of arsenic and antimony removal and a step of zinc powder electrodeposition. The technology is characterized in that chemical components in the smelting ash are analyzed, and the smelting ash is leached through a sodium hydroxide leaching agent; the electrolytic lead powder is added to the resultant leachate to remove copper; the electrolytic lead powder is produced through electrodeposition of the resultant copper removed solution; residual lead in the resultant lead removed liquid is separated and deposited through adopting the sodium sulfide as a lead removal agent; arsenic and antimony in the lead removed liquid are removed; and the arsenic and antimony removed purified liquid undergoes electrodeposition to produce zinc powder, and an electrolytic waste liquid returns to the leaching operation as an alkaline leaching agent, or enters the purification operation for removing impurity ions from the waste liquid and then returns to the leaching operation as the alkaline leaching agent for recycle. The technology which can process different types of zinc-containing dust waste materials has the advantages of simple operation, less equipment investment, high zinc and lead recovery rate, and loop cycle, no wastewater discharge and environmental protection in the whole technological process.

Description

technical field [0001] The invention belongs to the technical field of smelting, and relates to a process for recovering and producing electrolytic zinc powder and lead powder from smelting soot by an alkali leaching method. 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 hydrometallurgical zinc smelting process to treat smelting soot will encounter technical deficiencies such as no suitable purification method for chlorine and fluorine in zinc sulfate solution, large amount of zinc powder, and high operating costs. [0003] In the prior art, such as: "A Zinc Wet Metallurgy Process" Publication No. CN 1341760, the zinc-containing ore or zinc-containing industrial waste residue and dust are purified by leaching and then ele...

AI Technical Summary

Problems solved by technology

However, an obvious shortcoming of the ammonia-ammonium chloride system is that ammonia has a pungent smell, the operating environment is poor, and the loss of ammonia is large. In actual production, sealing equipment is required, which will increase equipment costs and bring operational problems. the inconvenience

This technology requires that the raw materials contain less impurities, and its purification method is difficult to adapt to the raw materials containing silicon, aluminum, arsenic, tin, chlorine, and fluorine. Silicon, aluminum, arsenic, tin, chlorine, and fluorine are rich in alkaline solutions. After collection, the purification effect cannot be achieved by using this method

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