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Method for preparing high-purity metal chromium through carbon reduction

A high-purity metal chromium technology, applied in the field of carbon reduction to prepare high-purity metal chromium, can solve problems such as difficult to meet production requirements, low purity, waste of resources, etc., to improve low production efficiency, reduce impurity content, and increase conversion rate Effect

Pending Publication Date: 2022-01-14
SIRUI ADVANCED COPPER ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The production methods of metal chromium in the prior art have thermite method, electrolysis method and electric silicothermal method, the metal chromium of domestic production at present, the mode that most adopt is that chromium oxide, reducing agent aluminum and exothermic agent sodium chlorate are mixed according to certain Proportional mixing for smelting; however, the conversion rate of chromium oxide in this method can only reach 80-83%, resulting in lower production efficiency and greater waste of resources;
[0005] In addition, the existing problem is that the obtained metal chromium has high impurity content, low purity, and low yield, which is difficult to meet the production requirements of the superalloy industry, target material industry, and electrical alloy contact industry.

Method used

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  • Method for preparing high-purity metal chromium through carbon reduction
  • Method for preparing high-purity metal chromium through carbon reduction
  • Method for preparing high-purity metal chromium through carbon reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing high-purity metal chromium by carbon reduction, comprising the following steps:

[0036] S1: weighing

[0037] Measure chromium oxide green powder and graphite milk respectively; the mass ratio of graphite milk to chromium oxide green powder is 1:4; the particle size of chromium oxide green powder is 20-30 μm;

[0038] Graphite milk includes 90% fixed carbon and organic solvent; its Baume degree is 60°; the organic solvent is alcohol;

[0039] S2: mixed powder

[0040] Pour the weighed chromium oxide green powder into the stirring mixer, then add graphite milk; mechanically stir for 1.5h;

[0041] S3: suppression

[0042] Then use a compression molding device to compress the mixed material, and the pressure parameter is 10MPa;

[0043] The mold of the compression molding device presses the mixed material into a hollow blank; and the mold uniformly forms a circular vent hole on the inner and outer walls of the blank; the diameter of the vent ho...

Embodiment 2

[0050] A method for preparing high-purity metal chromium by carbon reduction, comprising the following steps:

[0051] S1: weighing

[0052]Measure chromium oxide green powder and graphite milk respectively; the mass ratio of graphite milk to chromium oxide green powder is 1:4; the particle size of chromium oxide green powder is 50-60 μm;

[0053] Graphite milk includes 98% fixed carbon and organic solvent; its Baume degree is 76°; the organic solvent is alcohol;

[0054] S2: mixed powder

[0055] Pour the weighed chromium oxide green powder into a stirring mixer, then add graphite milk; mechanically stir for 2 hours;

[0056] S3: suppression

[0057] Then use a compression molding device to compress the mixed material, and the pressure parameter is 40MPa;

[0058] The mold of the compression molding device presses the mixed material into a hollow blank; and the mold uniformly forms a circular vent hole on the inner and outer walls of the blank; the diameter of the vent ho...

Embodiment 3

[0065] A method for preparing high-purity metal chromium by carbon reduction, comprising the following steps:

[0066] S1: weighing

[0067] Measure chromium oxide green powder and graphite milk respectively; the mass ratio of graphite milk to chromium oxide green powder is 1:5; the particle size of chromium oxide green powder is 30-40 μm;

[0068] Graphite milk includes 94% fixed carbon and organic solvent; its Baume degree is 68°; the organic solvent is alcohol;

[0069] S2: mixed powder

[0070] Pour the weighed chromium oxide green powder into the stirring mixer, then add graphite milk; mechanically stir for 1.6h;

[0071] S3: suppression

[0072] Then use a compression molding device to compress the mixed material, and the pressure parameter is 25MPa;

[0073] The mold of the compression molding device presses the mixed material into a hollow blank; and the mold uniformly forms a circular vent hole on the inner and outer walls of the blank; the diameter of the vent ho...

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Abstract

The invention relates to the technical field of metal chromium preparation, and discloses a method for preparing high-purity metal chromium through carbon reduction. The method comprises the following steps of respectively measuring chromium oxide green powder and aquadag, wherein the mass ratio of the aquadag to the chromium oxide green powder is 1: (4 to 5); mixing the weighed chromium oxide green powder with the aquadag; then pressing the mixed material into a hollow blank by adopting a compression molding device, and uniformly forming circular ventilation ducts on the inner and outer side walls of the blank by a mold; loading the pressed hollow blank into a vacuum sintering furnace for sintering; and sequentially crushing, grinding and sieving a reduction product obtained through sintering, and obtaining metal chromium powder. According to the method for preparing the high-purity metal chromium through carbon reduction provided by the invention, the conversion rate of preparing the metal chromium powder from chromium oxide can be greatly increased; and the impurity content in the metal chromium powder is reduced.

Description

technical field [0001] The invention relates to the technical field of metal chromium preparation, in particular to a method for preparing high-purity metal chromium by carbon reduction. Background technique [0002] Chromium metal has the characteristics of high melting and boiling point, high hardness, strong corrosion resistance, and metallic luster. The material can be widely used in sputtering coating targets, thermal spraying, powder metallurgy products, fuel cell plates, aerospace superalloys, electrical alloy contacts, automobiles, shipbuilding and other fields. [0003] Especially the high-temperature alloy industry, target industry, electrical alloy contact industry, etc. currently have very strict requirements on metal chromium, which must meet higher purity, lower gas impurities and low melting point impurities, lower preparation costs, higher product consistency, etc. [0004] The production methods of metal chromium in the prior art have thermite method, elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B22F9/04
CPCB22F9/20B22F9/04
Inventor 贺猛闫利平杨莉聂红锋翟荣荣孙刚刚
Owner SIRUI ADVANCED COPPER ALLOY CO LTD
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