In the zinc smelting method, there are two production processes of fire method and wet method. The application of pyrometallurgical zinc is earlier, including zinc smelting in vertical tanks, zinc smelting in vertical tanks, zinc smelting by electrothermal method, and zinc smelting in blast furnaces. Wet zinc smelting started late, and the first semi-industrial wet zinc smelting test began in the 1790s. Until the middle of the First World War, wet zinc smelting began industrial production.
In the development of wet zinc smelting, the vast number of technicians firstly dealt with the processes of neutral leaching, purification and electrolysis. After the 1960s, the focus of development was shifted to neutral leaching slag and valuable gold. The comprehensive recovery of the genus. Due to the large amount of neutral leaching slag, the slag contains high zinc (20%~30%). How to recover zinc is an important issue. Under the continuous efforts of people, it has developed two treatments of neutral leaching slag. method. The fire method uses high-temperature smouldering and volatilization, and returns leaching and recovering zinc in the form of Zn0 soot; the wet method is high-temperature and high-acid leaching, so that zinc enters the solution, and a large amount of iron also enters the solution, and then the jarosite is used. The iron method is removed by the sputum method, the goethite method or the hematite method, and the zinc-containing liquid is returned to the neutral leaching to recover the zinc. Years of practice have proved that the use of neutral leaching, high temperature and high acid treatment of leaching slag, iron removal, purification, electrolysis of wet zinc smelting, in the recovery rate of zinc, comprehensive recovery of valuable metals, energy saving and environmental protection have a certain fire method The advantages. So far, zinc smelting has become the main method for producing zinc. About 80% of the world's total zinc production is produced by wet process. In China, the development of zinc smelting in the world is the same. Except for the early establishment of the manufacturer, the majority of the newly built factories use the wet zinc smelting process.
The typical wet zinc smelting process includes: neutral leaching, purification, electrolysis, etc. The neutral leaching slag treatment has rotary kiln ashing or high temperature and high acid leaching and iron removal process. The wet zinc smelting process can be summarized and summarized as shown below.
In the figure, it is particularly pointed out that the calcination process is actually a fire process, and the high-temperature smouldering of the slag is also a fire process, because they are an indispensable process in wet zinc smelting, so they are included in the wet process. In the zinc process. At present, a process is still used in wet production, but the number of users of process b is increasing rapidly.
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