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Method for recycling valuable metal from stainless steel dust

A valuable metal, stainless steel technology, applied in the field of steelmaking dust recycling, can solve the problem of more than the loss of the effect, and achieve the effect of easy operation, quick effect, and wide source of raw materials

Inactive Publication Date: 2003-05-07
青岛森田金属有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But all need to invest in new equipment, due to the investment in equipment, the effect outweighs the gain, and has not been promoted in metallurgical plants.

Method used

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  • Method for recycling valuable metal from stainless steel dust
  • Method for recycling valuable metal from stainless steel dust
  • Method for recycling valuable metal from stainless steel dust

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Experimental program
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Effect test

Embodiment Construction

[0033] According to the method of the present invention, three batches of mixtures or pellets composed of stainless steel dust and reducing agent were prepared, and their specific composition ratios (wt%) are shown in Table 2.

[0034] Table 2 The composition ratio (wt%) of the mixture or pellets composed of stainless steel dust and reducing agent

[0035] Note: AD-30 is smelting aluminum residue with 30% Al content.

[0036] Put 1 Kg of the mixed material prepared by batch number 1 in the embodiment into a graphite crucible, heat it with a nozzle, and put a thermocouple in the crucible. When the temperature reaches 800 ° C, even if the nozzle stops heating, the thermite in the crucible The reduction reaction is still going on, producing continuous chemical reactions. After the burner is ignited and heated for 3 minutes, the maximum temperature in the crucible reaches 1400°C. During this process, it is an exothermic reaction, that is, the metal oxide in the stainless steel ...

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Abstract

A process for recovering the valuable metals from stainless steed dust features that the reducer is used to reduce the oxides of the valuable metals in said stainless steel dust to become the valuable metals. Said reducer is composed of aluminium powder (53-100 wt.%), adhesive (0-20) and ion oxide scale powder (0-27). Said reducer is mixed with the stainless steel dust and then sphericized. After smelting, the valuable metals can be recovered. Its advantages are high recovery rate and low cost.

Description

technical field [0001] The invention belongs to the field of transformation of solid waste, and mainly relates to the recycling of steelmaking dust. Background technique [0002] During steelmaking, about 2% of steel production dust is produced. The composition of these dusts varies with the type of smelting steel. When smelting ordinary steel, the main components of the dust are iron oxide and zinc oxide, and it also contains calcium oxide, silicon oxide, etc. In electric furnace steelmaking, most of the scrap steel is made of light and thin materials, mainly scraps of galvanized sheets. Therefore, the content of ZnO in steelmaking dust is relatively high. Coarse Zn can be separated from this ZnO-containing dust, and then refined into metallic Zn. Usually the metal Zn recovery is not carried out in the smelter, but is entrusted to a specialized enterprise for recovering Zn. Therefore, the smelter has to bear the cost of transporting these dusts, and the financial burden ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/04C22B7/00
CPCY02P10/20
Inventor 丰田哲夫李继宗肖卫学
Owner 青岛森田金属有限公司
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