Technological method for extracting zinc by roasting blast furnace gas mud by virtue of rotary kiln

Abstract

The invention discloses a technological method for extracting zinc, in particular to a technological method for extracting zinc by roasting blast furnace gas mud by virtue of a rotary kiln, belonging to the technical field of metallurgy production. By applying the technological method provided by the invention, zinc oxide in the gas mud can be thoroughly reduced, and the production cost is low. The technological method comprises the following steps of: a) burdening, namely adding coke powder with the mass ratio of 16-20% into the gas mud and mixing to be uniform; b) checking, namely carrying out a sampling test on the calorific value of mixture of the gas mud and the coke powder which are uniformly mixed, wherein the acceptable calorific value is 1600-2000 kcal / kg; c) roasting and reducing, namely directly sending the qualified mixture of the gas mud and the coke powder into a kiln body of the rotary kiln to be roasted and reduced, thus zinc oxide particles and metallized slag are generated; and d) collecting, namely collecting the zinc oxide particles at the tail of the kiln and discharging residual metallized slag from the head of the kiln.

Description

technical field [0001] The invention relates to a process for extracting zinc, in particular to a process for extracting zinc by roasting blast furnace gas mud in a rotary kiln, and belongs to the technical field of metallurgical production. Background technique [0002] Gas mud is a kind of ironmaking tailings formed by collecting fine dust generated in the process of blast furnace ironmaking through dust collection, water washing and other processes, and the iron and carbon contents each account for about 1 / 4 to 1 / 3. Because it contains a lot of iron and carbon, it is a good iron-making raw material. If it can be recycled, it can save some coal resources and iron ore resources, and at the same time can greatly reduce the cost of gas mud transportation and storage, and Avoiding serious environmental pollution caused by disposal of gas mud has far-reaching economic and environmental significance. [0003] In recent years, with the shortage of iron ore resources, blast furna...

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Problems solved by technology

There are following problems in the method for this processing gas slime: the one, the residual carbon in the slag after processing, residual zinc content are higher, cause the waste of charcoal resources and the increase of production cost; Thoroughly, after being added to the blast furnace as a raw material, it will still cause great harm to the ironmaking equipment and ironmaking production; the third is that the gas peat dry and / or coke mixture must be pelletized and dried before reduction, and the production cost is high; Fourth, the dry coal and / or coking coal added to the gas mud has a high impurity content, which is likely to cause ring formation in the rotary kiln, prolong the production period of the kiln, and further increase the production cost

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