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Method for using stainless steel dust to produce chrome, nickel and iron alloy

A technology of inconel and stainless steel, which is applied in the field of comprehensive utilization of metallurgical waste, can solve the problems of short process equipment footprint, no use of electric furnace melting, and increased production costs, so as to improve the level of smelting, broaden the market, industrial application prospects, The effect of reducing smelting cost

Inactive Publication Date: 2015-04-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is short and the investment is low, but the problems are that the operation is difficult and the slag composition is not easy to control
For example: Fastmet / Fasmelt method, this method has advantages such as flow process is short, equipment floor space is few, reaction time is short, no secondary pollutants such as waste water and waste gas produce, but this method has following deficiency: the rate of recovery of chromium is low (only 70%), high requirements for pulverized coal, high process energy consumption, etc.
However, because a large amount of binder is generally used in the preparation process, the production cost increases, and at the same time, the large amount of slag brought by the binder does not use the electric furnace melting in the later stage, so it is necessary to develop a new type of carbon-containing stainless steel dust. Pellet Rotary Hearth Furnace Smelting Process

Method used

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  • Method for using stainless steel dust to produce chrome, nickel and iron alloy
  • Method for using stainless steel dust to produce chrome, nickel and iron alloy
  • Method for using stainless steel dust to produce chrome, nickel and iron alloy

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] The TFe content contained in a certain stainless steel dust is 33.18%, the Cr content is 11.81%, and the Ni content is 2.10%. The main chemical composition is shown in Table 1.

[0022] The main chemical composition (wt%) of stainless steel dust in table 1 Example 1

[0023]

[0024] The fixed carbon content in a certain bituminous coal powder is 57.81%, the ash and volatile content are 7.24% and 34.01% respectively, and its colloidal layer index is not less than 8 to ensure that the hot briquette has sufficient compressive strength. The chemical composition is shown in Table 2.

[0025] Chemical composition (wt%) of table 2 bituminous coal powder

[0026]

[0027] After the stainless steel dust and coal powder are crushed and sieved, the stainless steel dust is 80% and the coal powder is 20% according to the mass percentage, mixed, heated and hot-pressed, and the hot-pressing temperature is controlled at 200°C and hot-pressed The pressure is 35 MPa, and the alkal...

example 2

[0033] The stainless steel dust and coal powder that meet the particle size and composition requirements are mixed according to the ratio of 77.43% stainless steel dust and 22.57% coal powder in terms of mass percentage, mixed, heated and hot-pressed, and the hot-pressing temperature and hot-pressing pressure are controlled respectively 200 ℃ and 40MPa, the basicity of the carbon-containing stainless steel dust hot briquette obtained by final pressing is 2.68, and the main chemical composition of the carbon-containing stainless steel dust hot briquette is shown in Table 4.

[0034] The main chemical composition (wt%) of the carbon-containing stainless steel dust hot briquette in the example 2 of table 4

[0035]

[0036] The compressive strength of the obtained carbon-containing stainless steel dust hot briquetting block reaches 1210N / piece, and the drop strength reaches 5.1 times / piece.

[0037] Put the obtained hot briquette into the rotary hearth furnace. The hot briquet...

example 3

[0039] The stainless steel dust and coal powder that meet the particle size and composition requirements are mixed according to the ratio of 82.05% stainless steel dust and 17.95% coal powder in terms of mass percentage, and mixed, heated and hot-pressed, and the hot-pressing temperature and hot-pressing pressure are controlled respectively The basicity of the carbon-containing stainless steel dust hot briquette obtained by final pressing is 2.87, and the main chemical composition of the carbon-containing stainless steel dust hot briquette is shown in Table 5.

[0040] The main chemical composition (wt%) of the carbon-containing stainless steel dust hot briquette in the example 3 of table 5

[0041]

[0042] The compressive strength of the obtained carbon-containing stainless steel dust hot briquetting block reaches 1070N / piece, and the drop strength reaches 4.3 times / piece.

[0043] Put the obtained hot briquette into the rotary hearth furnace. The hot briquette is preheat...

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Abstract

The invention provides a method for using stainless steel dust to produce chrome, nickel and iron alloy, and belongs to the technical field of metallurgical waste comprehensive utilization. The method for using the stainless steel dust to produce the chrome, nickel and iron alloy mainly includes: compounding the stainless steel dust and coal powder according to a certain proportion, mixing the stainless steel dust and the coal powder evenly so as to obtain a mixture, heating the mixture, hot pressing the mixture into a hot pressing block, and then obtaining the chrome, nickel and iron alloy and slag by using water to quench the hot pressing block and screening the hot pressing block after the hot pressing block is reduced by a rotary hearth furnace. The method for using the stainless steel dust to produce the chrome, nickel and iron alloy is simple in technology, does not need to use an adhesion agent during the whole process, is high in reducibility speed, strong in raw material adaptability, low in energy consumption, small in slag quantity, and high in iron, chrome and nickel yield, has important application value for valuable metal in the stainless steel dust which is recycled, and has a wide industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical waste, and in particular relates to a method for producing Inconel by using stainless steel dust. Background technique [0002] Stainless steel has good corrosion resistance, and it is widely used in chemical industry, construction, catering, automobile, medical and other industries. In recent years, with the rapid development of the economy, the stainless steel industry has developed rapidly, and the output of stainless steel crude steel has increased year by year. World crude stainless steel production increased from 25 million tons in 2009 to 38 million tons in 2013, an increase of nearly 1.5 times. [0003] Stainless steel is usually produced by the two-step or three-step method of electric arc furnace smelting, double blown converter direct smelting and out-of-furnace refining. During the smelting process of stainless steel, the mixture of metal and slag c...

Claims

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Application Information

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IPC IPC(8): C22B1/248C22B1/243
CPCY02P10/20
Inventor 储满生李晰哲柳政根陈双印
Owner NORTHEASTERN UNIV
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