Method and system for treating metallurgical slag

A metallurgical slag and oxidative roasting technology, applied in the metallurgical industry, can solve the problems of high energy consumption, incomplete reduction, unfavorable steelmaking process, etc.

Inactive Publication Date: 2016-08-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the carbon-containing pellets are reduced at a temperature greater than 1200 °C, the metallurgical slag melts to separate the reduced coal and slag, which deteriorates the reaction kinetics; when the reaction temperature is higher, such as above 1450 °C, it belongs to smelting reduction, although it can be reduced, However, the energy consumption is too high; if the reduction temperature is lower than the melting point of the metallurgical slag, although the pellets will not melt, the metallurgical slag will fully contact the reduced coal, but fayalite is difficult to restore, the red

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  • Method and system for treating metallurgical slag

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A copper smelting slag, its composition is: TFe 41.52%, Cu 0.36%, S 0.35%. Reduced coal fixes 72% of carbon and 0.32% of S. Mix according to the ratio of copper slag: limestone: binder = 100:18:10, and the mixed material is pelletized. After the pellets are dried, oxidative roasting is carried out at a roasting temperature of 850° C. and a roasting time of 25 minutes. After roasting, the S content of the pellets is 0.02%. The pellets are crushed to below -2mm, and the balls are mixed and pressed according to the ratio of copper slag after roasting: reduced coal: binder: water = 100:25:5:10, and reduction roasting is carried out after the pellets are dried. The roasting temperature is 1200 ℃, and the firing time is 40 minutes. The calcined pellets are cooled by water quenching and then subjected to grinding and magnetic separation to finally obtain metal iron powder with TFe92.89%, and the S content in the iron powder is 0.021%.

Embodiment 2

[0058] A copper smelting slag, its composition is: TFe 41.52%, Cu 0.36%, S 0.35%. Reduced coal fixes 72% of carbon and 0.32% of S. Mix according to the ratio of copper slag: limestone: binder = 100:15:10, and the mixed material is pelletized. After the pellets are dried, oxidative roasting is carried out at a roasting temperature of 850° C. and a roasting time of 25 minutes. After roasting, the S content of the pellets is 0.027%. The pellets are crushed to below -2mm, and the balls are mixed and pressed according to the ratio of copper slag after roasting: reduced coal: binder: water = 100:25:5:10, and reduction roasting is carried out after the pellets are dried. The roasting temperature is 1200 ℃, and the firing time is 40 minutes. The calcined pellets are cooled by water quenching and then subjected to grinding and magnetic separation to finally obtain metal iron powder with TFe92.03%, and the S content in the iron powder is 0.030%.

Embodiment 3

[0060] A copper smelting slag, its composition is: TFe 41.52%, Cu 0.36%, S 0.35%. Reduced coal fixes 72% of carbon and 0.32% of S. Mix according to the ratio of copper slag: limestone: binder = 100:15:10, and the mixed material is pelletized. After the pellets are dried, oxidative roasting is carried out at a roasting temperature of 900° C. and a roasting time of 20 minutes. After roasting, the S content of the pellets is 0.022%. The pellets are broken down to below -2mm, and the balls are mixed and pressed according to the ratio of copper slag after roasting: reduced coal: binder: water = 100:25:5:10, and reduction roasting is carried out after the pellets are dried. The roasting temperature is 1300 ℃, and the firing time is 25 minutes. The calcined pellets are cooled by water quenching and then subjected to grinding and magnetic separation to finally obtain metal iron powder with TFe93.14%, and the S content in the iron powder is 0.021%.

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Abstract

The invention discloses a method and system for treating metallurgical slag. The method comprises the steps that the metallurgical slag, limestone and adhesives are subjected to forming treatment, so that first material pellets are obtained; oxidizing roasting is conducted on the first material pellets, so that fayalite in the metallurgical slag is converted into ferric oxide, and meanwhile oxidizing roasting products are obtained through desulfurization; the oxidizing roasting products are crushed, so that crushed oxidizing roasting products are obtained; the crushed oxidizing roasting products, reducing coal, the adhesives and water are subjected to forming treatment, so that second material pellets are obtained; reducing roasting is conducted on the second material pellets, so that the iron oxide in the second material pellets is converted into iron, and meanwhile reducing roasting products are obtained through desulfurization; and ore grinding and magnetic separation are conducted on the reducing roasting products, so that metal iron powder and tailings are obtained. By the adoption of the method, the problem that reduction of fayalite in the metallurgical slag is difficult is solved, effective separation of the iron element is achieved, and high-quality low-sulfur metal iron powder can be obtained advantageously.

Description

technical field [0001] The invention belongs to the technical field of metallurgical industry, in particular to a method and system for processing metallurgical slag. Background technique [0002] In the prior art, with the development of society and economy, the production and consumption of non-ferrous metals are also increasing day by day. Along with the smelting process of non-ferrous metal products, a large amount of smelting slag and tailings are also discharged. Most of these smelting slags are high-temperature molten slags obtained by pyrometallurgy. In order to recover the valuable elements in them, some smelting slags are quenched in water to room temperature and then crushed with chemicals for flotation to finally obtain smelting furnace slag ore dressing tailings. . These smelting slags and beneficiation tailings generally contain 35-55 wt% iron, mainly in fayalite phase. Due to the difficulty in utilizing smelting slag and tailings, a large amount exists in t...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B7/04C22B1/242
CPCC22B1/02C22B1/2406C22B1/242C22B7/001C22B7/04Y02P10/20
Inventor 王敏吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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