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A method for preparing chromium oxide by reclaiming aluminum-containing nickel-based superalloy cutting waste

A high-temperature alloy and chromium oxide technology, applied in the direction of chromium oxide/hydrate, etc., to achieve the effects of easy control of the process, saving energy consumption, and low composition requirements

Active Publication Date: 2020-06-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the current technology of recycling and preparing chromium oxide from nickel-based superalloy waste, the present invention provides a method for recovering and preparing high-purity chromium oxide from nickel-based superalloy cutting waste

Method used

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  • A method for preparing chromium oxide by reclaiming aluminum-containing nickel-based superalloy cutting waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The mass fraction of chromium in the nickel-based superalloy cutting waste used in this example is 15%, and the mass fraction of aluminum is 2%.

[0031] (1) Breaking the nickel-based high-temperature alloy cutting waste into small particles, the alloy particles having a particle size of 0.01-5 mm;

[0032] (2) The small alloy particles described in step (1) are leached in a mixed acid of hydrochloric acid and nitric acid, and the leaching solution and leaching residue are obtained after solid-liquid separation; the concentration of hydrochloric acid is 6mol / L, the concentration of nitric acid Is 3mol / L, the volume of the inorganic acid V=8m, where m is the mass of the alloy powder, the unit is g, and the unit of V is mL; the temperature of the leaching treatment is 70°C, and the time of the leaching treatment is 2h;

[0033] (3) Using alkali solution as a precipitant, slowly adjust the pH of the system until the pH of the reaction system reaches 12.0, and then perform solid-...

Embodiment 2

[0039] The mass fraction of chromium in the nickel-based superalloy cutting waste used in this example is 18%, and the mass fraction of aluminum is 2%.

[0040] (1) Breaking the nickel-based high-temperature alloy cutting waste into small particles, the alloy particles having a particle size of 0.01-5 mm;

[0041] (2) The small alloy particles described in step (1) are leached in a mixed acid of hydrochloric acid and nitric acid, and the leaching solution and leaching residue are obtained after solid-liquid separation; the concentration of hydrochloric acid is 6mol / L, the concentration of nitric acid Is 2.5mol / L, the volume of the inorganic acid V=9m, where m is the mass of the alloy powder, the unit is g, and the unit of V is mL; the temperature of the leaching treatment is 80°C, and the time of the leaching treatment For 2h;

[0042] (3) Using alkaline solution as a precipitant, slowly adjust the pH of the system until the pH of the reaction system reaches 13, and then perform sol...

Embodiment 3

[0048] The mass fraction of chromium in the nickel-based superalloy cutting waste used in this example is 19%, and the mass fraction of aluminum is 4%.

[0049] 1) crushing the nickel-based superalloy cutting waste into small particles, the alloy particles having a particle size of 0.01-5mm;

[0050] 2) The small alloy particles described in step (1) are leached in a mixed acid of hydrochloric acid and nitric acid, and the leaching solution and leaching residue are obtained after solid-liquid separation; the concentration of hydrochloric acid is 6 mol / L, and the concentration of nitric acid is 3mol / L, the volume of the inorganic acid V=9m, where m is the mass of the alloy powder, the unit is g, and the unit of V is mL; the temperature of the leaching treatment is 75°C, and the time of the leaching treatment is 2h ;

[0051] 3) Using an alkaline solution as a precipitating agent, slowly adjust the pH of the system until the pH of the reaction system reaches 12.5, and then perform sol...

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Abstract

The invention proposes a method for recycling aluminum-containing nickel-based high-temperature alloy cutting waste to prepare chromium oxide. (1) Crushing the nickel-based high-temperature alloy cutting waste into particles; (2) Subjecting the alloy particles to oxidative acid leaching treatment; (3) Adjust the pH of the leach solution to remove some impurities; (4) Add an oxidant to the liquid separated from the impurities to perform oxidation treatment; (5) Adjust the pH of the solution to neutral, remove impurities, and continue to adjust the pH to acidic; (6) Add to the solution Add a reducing agent into the solution; (7) adjust the pH of the solution to obtain a precipitate, which is then dried and calcined to obtain pure chromium oxide. The invention effectively recovers chromium elements in aluminum-containing nickel-based high-temperature alloy cutting waste and prepares high-purity chromium oxide; it is suitable for the recovery and utilization of chromium elements in nickel-based alloy wastes with various chromium contents, and the leaching of chromium. The efficiency is high, and the recovered chromium oxide has high purity. The recycling process is simple and requires little equipment investment. It is an efficient, energy-saving and environmentally friendly method.

Description

Technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a method for recovering and preparing chromium oxide from cutting waste of aluminum-containing nickel-base high-temperature alloy. Background technique [0002] Chromium is mainly composed of chromite FeCr in nature 2 O 4 The type of chromite deposits in my country is mainly late magmatic deposits, which are characterized by small deposits, uneven distribution, overall reserves much smaller than other countries, and low chromite output. The production of chromium oxide products from chromite ore generally goes through three processes: chromite ore deposits are mined and washed to obtain chromite, which is called an upstream process; and then a variety of chromium salt products are produced from chromite through chemical processes , Called the midstream process; finally, the chromium oxide product is obtained from the chromium salt through a series of processing processes, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/32C01G37/02
Inventor 邢鹏飞王勃高帅波都兴红樊家豪
Owner NORTHEASTERN UNIV LIAONING
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