Combined long-term stable operation ammonium chloride method zinc electrolysis process flow

Abstract

The invention provides a combined long-term stable operation ammonium chloride method zinc electrolysis process flow. The flow comprises leaching, purification, an electrolysis main flow and an ultra-impurity raw material circulation coarse washing, excessive calcium and magnesium precipitation and oxidation impurity filtration auxiliary flow, and the two flows are arranged and connected in parallel, can work independently and do not influence each other. According to the flow, the stability of the quality of an electrolyte is controlled through the cooperation of main and auxiliary flows and through the whole flow, temperature control, compact parallel-series layout, multiple working sections, synchronization / asynchronism and multiple means, the multi-element interference brought by complex raw materials is solved, especially the problem of long-period stable and efficient operation of ammonium chloride method zinc electrolysis is solved, and the flow has positive environmental protection and economic significance in treatment of high-fluorine-chlorine and high-impurity zinc-containing raw materials through an ammonia method, and environmental protection and resource recycling of secondary zinc resources such as zinc-containing steel, metallurgical smoke and the like.

Description

technical field [0001] The invention relates to a combined long-term stable operation of the ammonia-based electrolytic zinc process, in particular to a combination of process equipment and a process flow for the long-term stable operation of the ammonium chloride electrolytic zinc, which solves the problem of the current ammonium chloride electrolytic zinc process. The problems of operation, electrolytic efficiency degradation over time and failure, belong to the field of hydrometallurgy. Background technique [0002] The ammonium chloride electrolytic zinc technology is a very effective chlorine-containing ammonia electrolytic zinc technology, especially suitable for the treatment of zinc-containing iron and steel dust, electroplating small ash, blast furnace and non-ferrous metallurgical furnace dust rich in fluorine and chlorine, and high iron impurities. The secondary zinc oxide produced by the set, as well as the high iron high calcium magnesium zinc oxide. The ammoni...

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Problems solved by technology

However, in actual application practice, due to differences in process flow, layout, equipment and control conditions, there are generally problems of poor quality of zinc flakes, low direct recovery casting rate, and high production costs, especially with the production time Prolonged, the accumulation of impurities in the electrolyte increases and the reaction is unbalanced, which further reduces the production efficiency, product quality and production efficiency, making it difficult to maintain normal production and affecting the promotion of this advanced technology

[0003] The main reason that the present inventor finds that these problems produce is: 1. zinc ammonium chloride system introduces more metal impurity ions, negative ions and organic functional groups than zinc sulfate system, can affect electrolyte at different stages, time of technological process 2. The process flow and layout of the current ammonium chloride electrolytic zinc method are mainly derived from the knowledge and experience of the traditional zinc sulfate method, and have not been designed for the characteristics of the zinc ammonium chloride method 3. The process equipment lacks targeted design and does not fully reflect the selective leaching, rapid purification and high-temperature electrolysis of the ammonium zinc chloride system. Features, do not match the requirements of the system properly

In short, due to the lack of targeted design of the current process and equipment, there are problems such as incomplete system, unreasonable layout, and unsuitable equipment, which makes it difficult to play the advantages of this new technology, high energy consumption, high zinc powder consumption, and low product quality. The present situation, especially the accumulation of other impurities formed in the background solution quality of the zinc ammonium chloride system during the circulation process, gradually reduces the efficiency of the zinc chloride ammonia electrolysis system, and cannot meet the long-term stable operation requirements of the ammonium chloride electrolysis zinc system

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