A method for dezincification of galvanized scrap steel

A technology for dezincification and scrap steel, applied in the direction of instruments, control/regulating systems, and process efficiency improvement, etc., can solve the problems of difficult recovery of zinc on the surface of scrap steel, difficult control of process parameters, and diffusion, etc., to ensure dezincification efficiency, The effect of promoting rapid evaporation and reducing diffusion time

Active Publication Date: 2022-05-03
欧冶链金再生资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the difficulty of dezincification of galvanized steel scrap lies in: the process parameters are difficult to control during the dezincification process, and the zinc on the surface of galvanized steel sheet is either difficult to fully evaporate, or it is easy to diffuse into the steel matrix, which makes it difficult to effectively recover the zinc on the surface of scrap steel

Method used

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  • A method for dezincification of galvanized scrap steel
  • A method for dezincification of galvanized scrap steel
  • A method for dezincification of galvanized scrap steel

Examples

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Embodiment 1

[0031] A method for dezincifying galvanized steel scrap in this embodiment, mixing galvanized steel scrap with coke powder, the mass ratio of galvanized steel scrap to coke powder is 1:0.367, and the mass of coke powder with a particle size of 0.5 mm to 5 mm accounts for the total coke powder. more than 85% of the powder quality, and the quality of 2.5~3mm coke powder accounts for more than 85% of the total coke powder quality in the present embodiment, the galvanized steel scrap that is mixed with coke powder is placed in the rotary kiln for dezincification, and the rotary kiln speed is : 1.8s / r; the galvanized steel scrap is a steel plate, and the mass percentages of elements in the galvanized layer are: Zn: 62% to 68%; Fe: 25% to 29%; S: 3.5% to 5.5%; Mn: 0.035 % to 0.085%; Al: 0.50% to 0.75%, and the rest are other elements; the steel plates are placed in the rotary kiln in a non-stacked state. Raise the temperature of the rotary kiln to 900°C with a heating rate of 10°C / m...

Embodiment 2

[0033] A method for dezincifying galvanized steel scrap in this embodiment, mixing galvanized steel scrap with coke powder, the mass ratio of galvanized steel scrap to coke powder is 1:0.367, and the mass of coke powder with a particle size of 0.5 mm to 5 mm accounts for the total coke powder. more than 85% of the powder quality, and the quality of 2.5~3mm coke powder accounts for more than 85% of the total coke powder quality in the present embodiment, the galvanized steel scrap that is mixed with coke powder is placed in the rotary kiln for dezincification, and the rotary kiln speed is : 1.8s / r; the galvanized steel scrap is a steel plate, and the mass percentages of elements in the galvanized layer are: Zn: 62% to 68%; Fe: 25% to 29%; S: 3.5% to 5.5%; Mn: 0.035 % to 0.085%; Al: 0.50% to 0.75%, and the rest are other elements; the steel plates are placed in the rotary kiln in a non-stacked state. Raise the temperature of the rotary kiln to 950°C with a heating rate of 10°C / m...

Embodiment 3

[0035]A method for dezincifying galvanized steel scrap in this embodiment, mixing galvanized steel scrap with coke powder, the mass ratio of galvanized steel scrap to coke powder is 1:0.367, and the mass of coke powder with a particle size of 0.5 mm to 5 mm accounts for the total coke powder. more than 85% of the powder quality, and the quality of 2.5~3mm coke powder accounts for more than 85% of the total coke powder quality in the present embodiment, the galvanized steel scrap that is mixed with coke powder is placed in the rotary kiln for dezincification, and the rotary kiln speed is : 1.8s / r; the galvanized steel scrap is a steel plate, and the mass percentages of elements in the galvanized layer are: Zn: 62% to 68%; Fe: 25% to 29%; S: 3.5% to 5.5%; Mn: 0.035 % to 0.085%; Al: 0.50% to 0.75%, and the rest are other elements; the steel plates are placed in the rotary kiln in a non-stacked state. Raise the temperature of the rotary kiln to 1000°C with a heating rate of 10°C / m...

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Abstract

The invention discloses a method for dezincifying galvanized scrap steel, which belongs to the technical field of solid waste treatment. The present invention mixes galvanized steel scrap and coke powder, the mass ratio of galvanized steel scrap and coke powder is 1:(0.250~0.400), the galvanized steel scrap mixed with coke powder is placed in a rotary kiln, and the temperature of the rotary kiln is raised to Dezincification is carried out at 900-1050°C; the present invention controls the amount of coke powder added and the temperature of the rotary kiln, so that the galvanized layer can be effectively recovered.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and more specifically relates to a method for dezincifying galvanized scrap steel. Background technique [0002] The global output of galvanized coils continues to grow. In 2014, the global output was 120.8 million tons, of which 50.7 million tons were produced in China. In 2016, the global output has reached 155 million tons. The zinc content of steelmaking OG mud remains high. At the same time, due to the full recovery of steelmaking OG mud from the No. 1 and No. 4 Steel Rolling Plants and the Long Products Division of Maanshan Iron and Steel Co., Ltd., the sintering process is added to the blast furnace for recycling, which increases the zinc load of the blast furnace and affects the stability of the blast furnace. The importance of zinc is particularly urgent. [0003] At present, Maanshan Iron and Steel Co., Ltd. No. 1 and No. 4 Steel Rolling Plants and Long Products Division...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/04C22B19/30G05D27/00
CPCC22B19/04C22B19/30G05D27/00Y02P10/20
Inventor 骆小刚孙前进琚泽龙曹玉龙李勇冯骏朱正海周俐王海军
Owner 欧冶链金再生资源有限公司
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