A method for preparing copper-chromium-containing wear-resistant cast iron by reducing molten depleted copper slag

A technology of wear-resistant cast iron and molten copper, applied in the field of metallurgy, can solve the problems of long process and achieve the effects of short construction period, broad application prospect and simple process

Active Publication Date: 2021-02-19
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The patent with the application number 201410345197.2 proposes a method for reducing copper slag to smelt copper-containing antibacterial stainless steel. The copper slag is moderately depleted and then deeply reduced to obtain a copper-iron alloy. Oxygen bottom blowing copper slag and other copper slag with good copper content; the desulfurizer on it is involved in molten iron for mixed desulfurization, but it does not involve the field of copper slag depletion; the patent application number 201710885434.8 proposes a wear-resistant cast iron material The preparation method involves mixing various raw materials and placing them in a melting furnace, which does not involve the secondary utilization of waste slag

Method used

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  • A method for preparing copper-chromium-containing wear-resistant cast iron by reducing molten depleted copper slag
  • A method for preparing copper-chromium-containing wear-resistant cast iron by reducing molten depleted copper slag

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Process such asfigure 1 shown;

[0050] The molten copper slag after the depletion treatment is introduced into the reduction furnace through the chute as a raw material melt. The temperature of the molten copper slag after the depletion treatment is 1200 °C; the iron grade TFe of the molten copper slag after the depletion treatment is 45.68%, containing FeO 45.14%, Cu 0.31%, Zn 1.68%, S 0.13%, Al by mass percentage 2 o 3 4.32%, CaO 1.68%, MgO 1.45%, SiO 2 21.56%;

[0051] Raise the temperature of the raw material melt to 1400°C through the reduction furnace, insert the stirring paddle into the center of the raw material melt through the lifting device, and the height difference between the stirring paddle and the liquid surface of the raw material melt is 1 / 2 of the total height of the raw material melt; then start Stirring paddle, the raw material melt is stirred by the stirring paddle, and a molten pool with centrifugal vortex is formed in the reduction furnace;...

Embodiment 2

[0055] Method is with embodiment 1, and difference is:

[0056] (1) The temperature of the molten copper slag after depletion treatment is 1250°C; the iron grade TFe of the molten copper slag after depletion treatment is 44.96%, containing FeO 46.78%, Cu 0.32%, Zn 1.02% by mass percentage, S 0.11%, Al 2 o 3 4.33%, CaO 1.75%, MgO 1.68%, SiO 2 22.57%;

[0057] (2) The temperature of the raw material melt is raised to 1430°C, and the height difference between the stirring paddle and the liquid surface of the raw material melt is 1 / 3 of the total height of the raw material melt; the rotating speed of the stirring paddle is 150r / min;

[0058] (3) The consumption of calcium oxide and coking coal is respectively 40% of the total mass of raw material melt; 45min of vortex reduction smelting;

[0059] (4) Copper-chromium-containing wear-resistant cast iron contains Cu 0.72%, Cr 13.15%, and S 0.05% by mass percentage.

Embodiment 3

[0061] Method is with embodiment 1, and difference is:

[0062] (1) The temperature of the molten copper slag after depletion treatment is 1250°C; the iron grade of the molten copper slag after depletion treatment is TFe 44.68, containing FeO 45.32%, Cu 0.33%, Zn 1.12%, S 0.15%, Al 2 o 3 4.28%, CaO 1.69%, MgO 1.71%, SiO 2 23.57%;

[0063] (2) The temperature of the raw material melt is raised to 1450°C, the height difference between the stirring paddle and the liquid surface of the raw material melt is 1 / 3 of the total height of the raw material melt; the rotating speed of the stirring paddle is 100r / min;

[0064] (3) The consumption of calcium oxide and coking coal is respectively 35% of the total mass of the raw material melt; vortex reduction smelting for 30min;

[0065] (4) Copper-chromium-containing wear-resistant cast iron contains Cu 0.72%, Cr 13.15%, and S 0.05% by mass percentage.

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Abstract

A method for preparing copper-chromium-containing wear-resistant cast iron by reducing molten depleted copper slag is carried out according to the following steps: (1) depleting the molten copper slag at a temperature of 1200-1250 ° C; discharging the remaining slag as a raw material for melting body; or use the molten copper slag after depletion treatment as the raw material melt; (2) heat up to 1400-1450°C, stir with the stirring paddle, and form a molten pool with centrifugal vortex in the reduction furnace; (3) spray The reducing agent is used for vortex reduction smelting; the slag is discharged; (4) ferrochrome alloy is added for quenching and tempering smelting and casting. The method of the invention has the advantages of quick and thorough reaction, short construction period, simple process, low equipment investment, energy saving, environmental protection, low cost and high economic value.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing wear-resistant cast iron containing copper and chromium by reducing molten depleted copper slag. Background technique [0002] With the rapid development of the copper smelting process, the strong oxidation melting process is widely used due to its advantages of fast smelting stage, high strength, high-grade copper matte and high iron removal rate; the copper matte will be mechanically included and chemically dissolved. Exist in copper slag, while high-grade copper-sulfur is produced, the grade of copper matte mixed in the slag is also high, resulting in a high copper content in the slag. After depletion treatment, the copper content in the waste slag is still as high as 0.4~ 0.8%; the high iron removal rate makes the copper matte grade high and at the same time almost all the iron is concentrated in the slag, up to 40-50%, and the copper and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C37/06C22B7/04
CPCC22B7/04C22C33/08C22C37/06Y02P10/20
Inventor 张廷安豆志河牛丽萍张子木刘燕张保敬赵秋月吕国志傅大学张伟光赫冀成
Owner NORTHEASTERN UNIV LIAONING
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