Technology for extracting aluminum and zinc from high-aluminum zinciferous aluminum-zinc residues

Abstract

The invention discloses a technology for extracting aluminum and zinc from high-aluminum zinciferous aluminum-zinc residues, and belongs to the technical field of treatment of metallurgical waste residues. The technology comprises the following steps: using aluminiferous zinciferous waste residues as a raw material; firstly performing airflow smashing on the raw material, and screening the raw material on which airflow smashing is performed so as to obtain waste residues; then adding sulphuric acid, acetone and an oxidizing agent into the waste residues so as to enable aluminum and zinc in the waste residues to be oxidized; then putting the oxidized waste residues into a Buchner funnel to perform sucking filtration, and separating the filtered waste residues so as to obtain sucking filtration liquid; dropwise adding a sodium hydroxide solution into the sucking filtration liquid, and after sediment occurs, putting the sediment into a muffle furnace to perform high-temperature calcination so as to obtain aluminum oxide powder and zinc oxide powder; and finally performing electrolysis on the aluminum oxide powder and zinc oxide powder by using carbon blocks as a cathode and an anode so as to obtain pure aluminum and pure zinc. The technology disclosed by the embodiment of the invention proves that through the adoption of the technology, the aluminum and the zinc in the aluminum-zinc residues can be effectively separated, the extraction rate is as high as more than 88%, the cost is low in the separation process, and any environmental pollution is not generated.

Description

technical field [0001] The invention discloses a process for extracting aluminum and zinc from high-aluminum zinc-containing aluminum-zinc slag, which belongs to the technical field of metallurgical waste slag treatment. Background technique [0002] High-aluminum zinc-aluminum-zinc slag actually refers to metallurgical waste slag. Metallurgical waste refers to various solid wastes produced in the production process of metallurgical industry. Mainly refers to blast furnace slag, steel slag, various non-ferrous metal slags produced in ironmaking furnaces, such as steel slag, lead slag, zinc slag, nickel slag, etc.; and red mud discharged from bauxite refining alumina And a small amount of iron oxide slag produced in the rolling process. As early as the 1940s, our country felt the urgency to solve the "slag damage" of metallurgical pollution. Basically, 0.3-0.5 tons of steel slag was discharged for every 1 ton of iron smelting, and 0.6-1.8 tons of red mud was discharged for ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: In view of the relatively low extraction rate and high cost in the extraction process in the current waste slag extraction process, which will cause pollution to the environment, acid is often used in the process of extracting aluminum and zinc from aluminum-zinc slag. However, under the condition of simultaneous acid leaching, aluminum and zinc will be leached at the same time, and cannot be extracted separately. If alkali is added, precipitation will occur again under alkaline conditions. This commonality will be dissolved again, resulting in the disadvantage of being unable to efficiently separate aluminum and zinc in waste residues. A process for extracting aluminum and zinc from high-aluminum zinc-containing aluminum-zinc residues is provided. This method is based on aluminum-zinc waste residues. The raw materials are first air-jet milled and sieved to obtain waste residue, then sulfuric acid, acetone and oxidant are added to oxidize the aluminum and zinc in it, and then the oxidized waste residue is put into a Buchner funnel for suction filtration, and the suction filtrate is obtained by separation. Add sodium hydroxide solution dropwise to the suction filtrate to form a precipitate, put the precipitate into a muffle furnace for high-temperature calcination to obtain aluminum oxide and zinc oxide powder, and finally use carbon blocks as two stages of yin and yang for electrolysis to obtain pure aluminum and pure zinc