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A method for preparing nickel-hard type I cast iron by using red mud to separate slag and iron efficiently

A technology of slag-iron separation and red mud, applied in the field of metallurgy, can solve the problems of low iron-nickel alloy iron content, various application principles, insufficient iron separation, etc., achieve high iron quality, complete separation, and reduce production costs Effect

Active Publication Date: 2021-11-23
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it not only uses many and complicated principles, but also the separation of slag and iron is not enough in the reaction, and the iron content in the obtained iron-nickel alloy is not high, which is 87.97%.

Method used

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  • A method for preparing nickel-hard type I cast iron by using red mud to separate slag and iron efficiently
  • A method for preparing nickel-hard type I cast iron by using red mud to separate slag and iron efficiently
  • A method for preparing nickel-hard type I cast iron by using red mud to separate slag and iron efficiently

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing nickel-hard cast iron, including the following steps:

[0041](1) After mixing Bayer method, the red soil nickel mine is mixed according to 7: 3 mass ratio, and the mass of 20% coke is added to the mixture, and the mass 3% of the mass is mixed, and the mass is 5%. The concentration was 4% aqueous sodium silicate solution, and then mixed uniform, cold pressure was dried in a drying tank at 60 ° C for 2 h, resulting in a mixture;

[0042] (2) After preheating the mixture at a temperature of 340 ° C for 3.5 h, it is placed in a medium-frequency induction furnace to heat reduction to obtain a ferric alloy; Image 6 As shown, iron alloy and slag separation thoroughly, resulting in the outer surface of the ferric alloy);

[0043] (3) After the iron alloy is added to the carbon-carbon-proof treatment, the addition of nickel, chrom is prepared into nickel coastal iron; the nickel content is added to a total nickel content of 3.58 wt.%, And the chromium content...

Embodiment 2

[0045] The difference from Example 1 is:

[0046] (3) After the iron alloy is removed, the addition of nickel is added to the addition of nickel, and the chrom is prepared into nickel coarse iron; the nickel content is added to a total nickel content of 4.05 wt.%, And the chromium content is added to a total chromium content of 1.88 wt.%.

Embodiment 3

[0048] The difference from Example 1 is:

[0049] (3) After the iron alloy is removed, the addition of nickel is added to the addition of nickel, and the chromium is prepared into nickel coarse iron; the nickel content is added to a total nickel content of 4.50 wt.%, And the chromium content is added to a total chromium content of 2.21 wt.%.

[0050] First, the nickel hard cast iron prepared by Example 1-3 was performed as follows:

[0051] Chemical composition analysis

[0052] Test the chemical composition analysis of cast iron alloy samples using ARL8860 direct reading spectrometer. Before the test, the oxidation of the sample surface was grinded with a grinding wheel, and then the sample was placed on the sample stage. The chemical composition obtained is in Table 2.

[0053] Table 2

[0054]

[0055]

[0056] The iron content of nickel-hard cast iron was 90.283 to 90.719%, and the chemical composition of each group was composed of nickel hard type I cast iron requirements...

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Abstract

The invention discloses a method for preparing nickel-hard I-type cast iron by using red mud to separate slag and iron efficiently, which belongs to the technical field of metallurgy and comprises the following steps: firstly mixing Bayer process red mud and laterite nickel ore, and then adding coke powder to the above-mentioned mixture and quicklime are mixed evenly, and then the mixture is preheated and put into the furnace for heating and reduction to obtain iron alloy; the iron alloy is prepared by adding nickel and chromium to make nickel hard cast iron, and then tempered at low temperature, and then it can be air-cooled out of the furnace. The effective treatment of the Bayer process red mud is realized, the cost is reduced, and the environment is friendly, and the microstructure characteristics of the finished nickel hard cast iron conform to the microstructure standard of the nickel hard cast iron type I.

Description

Technical field [0001] The present invention belongs to the field of metallurgy technology, in particular, a nickel-hard type I cast iron method was prepared by using red mud high-efficiency slag iron. Background technique [0002] Bayer method is the main method of refining alumina. The global alumina is produced by Bayer method, using Bayer Method to produce alumina, each production of one ton of alumina will produce 1-2 tons of pollution waste slag - red mud. At present, the whole world has a bayi method, the amount of Bayer method is close to 1 trillion tons, and the production of red muds in China is about 30 million tons. Red mud ingredients are complex, and minerals in the red mud include hematite, calcium, sodium silicate, rutile, perovskite, needle iron ore, hydrated garnet, silicon carbide, quartz and titanium magnetite. Iron mineral is mainly aklasite, followed by brown mine, titanium iron ore, and iron ore. Underkilances contain a variety of trace elements such as Ni,...

Claims

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Application Information

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IPC IPC(8): C22C33/08C22C37/08C22B7/04C22B5/10C21D5/00C21C7/068C21C1/08
CPCC21C1/08C21C7/068C21D5/00C22B5/10C22B7/001C22B7/04C22C33/08C22C37/08Y02P10/20
Inventor 汤宏群罗超庆曾建民何奥平胡珊珊莫继华周嘉昶康鹤译吴健强陈思敏
Owner GUANGXI UNIV
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