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Method for directly smelting copper-bearing antibacterial stainless steel by utilizing copper slag for reducing molten iron

An antibacterial stainless steel and copper slag technology, applied in the field of metallurgy, can solve the problems of high cost, no consideration of the removal of harmful components, and high smelting temperature, and achieves the effect of reducing production costs, improving the added value of comprehensive utilization, and wide adaptability

Active Publication Date: 2014-10-29
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent application No. 201310414062.2 proposes to add an appropriate amount of nickel-containing materials to the molten copper slag for smelting reduction to produce stainless steel. This method simultaneously recovers valuable components such as copper, nickel, and iron, but the melting temperature is as high as 1500-1700 ° C, and the cost Higher; however, the removal of harmful components such as arsenic, cadmium, and lead in copper slag is not considered

Method used

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  • Method for directly smelting copper-bearing antibacterial stainless steel by utilizing copper slag for reducing molten iron
  • Method for directly smelting copper-bearing antibacterial stainless steel by utilizing copper slag for reducing molten iron

Examples

Experimental program
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Effect test

Embodiment 1

[0061] A method for directly smelting copper-containing antibacterial stainless steel by using copper slag to reduce molten iron, the specific steps are as follows:

[0062] (1) Oxidation and impurity removal pretreatment:

[0063] The high-temperature molten copper slag at 1250°C is directly transferred into the high-temperature reduction furnace to form a molten pool with a depth of 20cm. The spray gun is inserted to a depth of 18cm. Oxygen is injected to oxidize and remove impurities from the molten copper slag. Eccentric mechanical stirring, injection oxygen flow rate of 400ml / min, injection pressure of 1.5MPa, injection time of 20min, stirring speed of eccentric mechanical agitation of 50rpm, to obtain sulfur content of less than 0.2mass% after oxidation and impurity removal pretreatment Molten copper slag;

[0064] (2) Smelting reduction of copper slag after pretreatment:

[0065] Add the slagging agent CaO to the molten copper slag after the pretreatment of oxidation ...

Embodiment 2

[0074] A method for directly smelting copper-containing antibacterial stainless steel by using copper slag to reduce molten iron, the specific steps are as follows:

[0075] (1) Oxidation and impurity removal pretreatment:

[0076]The high-temperature molten copper slag at 1300°C is directly transferred into the high-temperature reduction furnace to form a molten pool with a depth of 20cm. The spray gun is inserted to a depth of 18cm. Oxygen is injected to oxidize and remove impurities from the molten copper slag. Eccentric mechanical stirring, blowing oxygen flow rate of 500ml / min, blowing pressure of 1.0MPa, blowing time of 25min, stirring speed of eccentric mechanical stirring of 75rpm, to obtain sulfur content of less than 0.2mass% after oxidation and impurity removal pretreatment Molten copper slag;

[0077] (2) Smelting reduction of copper slag after pretreatment:

[0078] Add the slagging agent CaO to the molten copper slag after the pretreatment of oxidation and impu...

Embodiment 3

[0087] A method for directly smelting copper-containing antibacterial stainless steel by using copper slag to reduce molten iron, the specific steps are as follows:

[0088] (1) Oxidation and impurity removal pretreatment:

[0089] The high-temperature molten copper slag at 1350°C is directly transferred into the high-temperature reduction furnace to form a molten pool with a depth of 20cm. The spray gun is inserted to a depth of 18cm. Oxygen is injected to oxidize and remove impurities from the molten copper slag. Eccentric mechanical stirring, injection oxygen flow rate is 600ml / min, injection pressure is 0.5MPa, injection time is 30min, and the stirring speed of eccentric mechanical agitation is 100rpm, and the sulfur content is lower than 0.2mass%. molten copper slag;

[0090] (2) Smelting reduction of copper slag after pretreatment:

[0091] Add the slagging agent CaO to the molten copper slag after the pretreatment of oxidation and impurity removal, adjust the basicity...

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a method for directly smelting copper-bearing antibacterial stainless steel by utilizing copper slag for reducing molten iron. According to the method, high-temperature molten-state copper slag is directly transferred and injected into a high-temperature reduction furnace, oxygen is sprayed and blown into the furnace to perform oxidation impurity removing pretreatment on the molten copper slag, then, slagging constituents are added in the furnace, inert gas and natural gas are sprayed and blown into the furnace for smelting reduction to obtain copper-bearing molten iron, the copper-bearing molten iron is conveyed to the steelmaking process, copper-bearing mother steel liquor is obtained, continuous casting is performed on the molten steel mother liquor obtained by refining to obtain a steel billet, hot rolling and annealing treatment are performed on the steel billet, and the antibacterial stainless steel is obtained. According to the method, the production cost of the antibacterial stainless steel is greatly reduced, and meanwhile the comprehensive utilization added value of valuable elements of the copper slag is greatly improved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for directly smelting copper-containing antibacterial stainless steel by using copper slag to reduce molten iron. Background technique [0002] At present, my country's copper reserves are about 6,000 tons, more than 50% of which have been developed. Among the unutilized copper mines, there are few rich ore, many lean ore, low-grade raw ore, and difficult mining and utilization. At the same time, the copper, iron and other metals in the smelting slag produced by copper smelting are relatively high. The current emission of copper slag in my country is about 2000t / a, and the cumulative amount of copper slag is more than 200 million tons. In addition to copper, copper slag also contains more than 40% iron, and its grade is much higher than the mineable grade of iron ore in my country (TFe>27%). Even if the existing copper slag is depleted, the copper content is st...

Claims

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Application Information

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IPC IPC(8): C22C38/20C22C38/42C22C33/04
Inventor 张廷安牛丽萍豆志河王聪张旭华张子木刘燕赫冀成蒋孝丽
Owner NORTHEASTERN UNIV
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