System and method for industrially recycling zinc to produce nanometer zinc oxide

Abstract

The invention discloses a system and method for industrially recycling zinc to produce nanometer zinc oxide, and belongs to the technical field of chemical metallurgy. According to the production sequence of zinc recycling, the system comprises a rotary hearth furnace, a desalination device, an ammonia process digestion reactor, a purification reactor, a crystallization reactor, a calcification reactor, a rinsing tank, a drying device and a calcination device. The method comprises the steps that a second-class of zinc-containing material is fed into the rotary hearth furnace for the first timeof zinc recycling refining to produce secondary zinc oxide; ammonia process digestion is carried out on the secondary zinc oxide produced with the rotary hearth furnace and a first-class of zinc-containing material for the second time of zinc recycling refining so as to produce zinc and ammonia complex liquid; then the zinc and ammonia complex liquid is subjected to purification and carbonizationcrystallization to produce zinc oxide precursors; and the zinc oxide precursors are subjected to rinsing, drying and calcination to form a nanometer zinc oxide product. According to the system and method for industrially recycling zinc to produce nanometer zinc oxide, by combining an ammonia process and a rotary hearth furnace technology, the zinc in the zinc-containing materials is deeply recycled in a crossing combination manner, the zinc in the zinc-containing materials is completely recycled, and the grade of the produced zinc-containing product is 95% or more.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and metallurgy, and in particular relates to a system and method for producing nanometer zinc oxide by recovering zinc from zinc-containing materials. That is, the use of rotary hearth furnace and ammonia leaching process to jointly recover zinc to produce nano-zinc oxide (including high-purity zinc oxide). Background technique [0002] Iron and steel, nonferrous metallurgy, chemical industry and other industries produce a large amount of zinc-containing materials in the production process. These materials are also rich in elements with recycling and utilization value such as iron and carbon, and the zinc content of various materials is different. Therefore, it is difficult to comprehensively recover zinc and iron with a single production process to produce zinc and iron-containing products with high added value and high utilization value. [0003] At present, there are two main methods...

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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a system and method for industrialized recovery of zinc to produce nano-zinc oxide, which is used to solve the incomplete recovery of zinc in the existing ammonia leaching process, and the inability of valuable elements such as iron in the residue Recycling, the salt in the material causes the system to run poorly, the sub-zinc oxide produced by the rotary hearth furnace is of low grade, and the economic benefits are poor, etc.

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