Method for extracting zinc from electric furnace steelmaking dust by using industrial dust containing calcium oxide

Abstract

The invention discloses a method for refining zinc in electric furnace steel manufacturing dust by using calcium oxide-containing industrial dust. The method comprises the following steps: firstly analyzing components in the industrial dust, blending the industrial dust according to an analysis result, preparing a desalination material, and controlling the mass percentage of calcium oxide in the desalination material to be more than or equal to 52.5 percent; mixing the electric furnace steel manufacturing dust, a reducing agent and the desalination material to prepare a composition, feeding the composition into a reaction kiln, feeding air for high temperature reduction, carrying out sublimation to obtain gaseous zinc elementary substance, leading out the gaseous zinc elementary substancefor recycling, and obtaining calcium chloride which is a byproduct. The method has the outstanding effects that sintering industrial dust of a steel plant is applied to refining of the electric furnace steel manufacturing dust, so that the zinc in the electric furnace steel manufacturing dust can be almost completely recycled, and the production cost is lower; the mass percentage of the calcium oxide in the desalination material is more than or equal to 53.8 percent; rapid growth of sticky objects in the kiln wall can be avoided, thereby prolonging the production period and prolonging the service life of equipment.

Description

technical field [0001] The invention relates to a method for dry recovery of valuable metal zinc, in particular to a method for extracting zinc in electric furnace steelmaking dust by using industrial dust containing calcium oxide. Background technique [0002] In order to reduce costs, save resources, and protect the environment, the trend of using scrap iron as raw material instead of iron ore to produce steel is on the rise globally. Generally speaking, in the electric furnace steelmaking with scrap iron as raw material, about 1-2% steelmaking dust is produced during the melting process, and the steelmaking dust contains a large amount of valuable metals such as zinc, lead, and iron. The content of valuable metals in the recycling objects will vary depending on the steelmaking raw materials (scrap grade) of the electric furnace steelmaking company, but the approximate content of valuable metals in the electric furnace steelmaking dust is 15-35% zinc %, 10-35% iron, 1-7% ...

AI Technical Summary

Problems solved by technology

Due to the complex composition of industrial dust containing CaO, using it in the refining process of electric furnace steelmaking dust will increase the adhesion rate in the kiln and increase the solid impurity content in the gasification product, etc.

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