Method for recovering nonferrous metals, rare and noble metals and iron powder from steelmaking flue dust

A technology for non-ferrous metals and rare and precious metals, which is applied in the field of rare and precious metals and iron powder, recycling non-ferrous metals, and can solve the problem of low comprehensive utilization of resources

Inactive Publication Date: 2017-01-04
KUNMING METALLURGY COLLEGE
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  • Method for recovering nonferrous metals, rare and noble metals and iron powder from steelmaking flue dust

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Embodiment Construction

[0010] See attached figure 1 , using the steelmaking fume produced by the steelmaking furnace of Kunming Iron and Steel Holding Co., Ltd., its chemical composition is (Wt%): Zn 24.52 , Pb 4 , Fe 26 , S 0.5, In 0.02, Ag 0.01, Bi 0.4, Sn 0.5Au 0.00008 , the process is as follows:

[0011] 5000 kg of steelmaking dust, liquid chlorinating agent (a mixture of calcium chloride and sodium chloride 10-12:1) is added at a ratio of 50 kg; the reducing agent is coke powder, and the addition amount is 100 kg. Fully wet and mix in the barrel mixer so that the moisture content of the mixture is 4%, put it into the tunnel kiln, and the chemical reaction in it is carried out in two stages. The first stage is a medium temperature chlorination reaction, and the temperature is controlled at 1000-1050℃ After 100 minutes, non-ferrous metals, rare and precious metals Zn, Pb, Bi, Sn, In, Ge, Ag, Au, etc. in the steelmaking flue dust undergo chlorination reactions, and low-boiling chlorides volatil...

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Abstract

The invention provides a method for recovering nonferrous metals, rare and noble metals and iron powder from steelmaking flue dust. The method comprises the following steps: mixing the steelmaking flue dust with a chlorination agent and a reducing agent, adding the obtained mixture to a tunnel furnace, and carrying out a two-stage reaction, wherein a primary stage reaction is a medium temperature chlorination reaction and allows nonferrous metals and precious metals to volatilize and enter flue gas, the flue gas is used as a nonferrous metal and precious metal extraction raw material after dusts are collected, and a secondary stage reaction is a high temperature reduction reaction and reduces iron into elemental iron which is discharged with kiln slag; and carrying out cooling, crushing and ball milling on the kiln slag to form a slag slurry with the granularity being smaller than 60 meshes, and carrying out magnetic separation to obtain the elemental iron powder and waste slag, wherein the iron content of the iron powder is greater than 86%, the iron powder can be used as commercial reduced iron powder, and the waste slag is sold to cement mills. The method allowing the chlorination and reduction metallurgy processes to be carried out in the tunnel furnace in a segmental manner has the advantages of process simplification, simplicity in operation, high thermal efficiency, low production cost and high comprehensive utilization rate, and is a new way for reasonable recovery of valuable metals in the steelmaking flue dust and high-efficiency resource utilization.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a method for recovering non-ferrous metals, rare and precious metals and iron powder from steelmaking dust. Background technique [0002] Steelmaking (electric furnace, converter) The output of soot can reach 1-2 of the steelmaking furnace load. It is a kind of soot with extremely fine particles. Generally, particles with a particle size below 20 μm account for more than 85% of the total, and the chemical composition is relatively complicated. It It not only contains a certain amount of iron and carbon, but also contains a small amount of non-ferrous metals such as zinc, lead, tin, copper, bismuth, etc., and rare and precious metals such as indium, germanium, gold, silver, etc., and also contains a variety of harmful substances such as lead, cadmium, Hexavalent chromium, cyanide and other metals and their compounds, it can be seen that steelmaking fume is an extremely harmful solid was...

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Application Information

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IPC IPC(8): C22B7/02C22B11/00C22B19/30C22B13/00C22B25/06C22B58/00C22B41/00C22B35/00
CPCY02P10/20
Inventor 邹强徐智勇黄劲峰
Owner KUNMING METALLURGY COLLEGE
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