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A method for separating and recovering chromium from vanadium-chromium waste slag

A technology for separation and recovery and waste residue, which is applied in the direction of improving process efficiency, can solve the problems of complex process and low added value, and achieve the effect of simple process, cost saving and high quality.

Active Publication Date: 2018-07-17
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of the step-by-step extraction process of vanadium and chromium existing in the above-mentioned prior art, the process of extracting vanadium and chromium is complicated, the scale of equipment is huge, and the prepared chromium products are low-end products with low added value. A method for recovering chromium, the method further reduces the process on the basis of the existing technology, and the process operation is simple, which can effectively realize the simultaneous separation of vanadium and chromium in the vanadium and chromium waste residue and prepare chromium oxide products with higher added value

Method used

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  • A method for separating and recovering chromium from vanadium-chromium waste slag

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Embodiment 1

[0060] The present embodiment provides a method for separating and recovering chromium from vanadium-chromium waste slag, said method comprising the following steps:

[0061] (1) Vanadium-chromium waste residue, chromium hydroxide washing solution and sulfuric acid are placed in an acid leaching reactor for acid leaching, the leaching temperature is 70° C., and the pH of the solution after leaching is 0.5;

[0062] (2) After the leaching reaction in step (1) is completed, hydrogen peroxide is added to the reaction system, the tetravalent vanadium is oxidized to pentavalent vanadium, and the ferrous iron is oxidized to ferric iron;

[0063] (3) The material after the oxidation reaction in step (2) is sent into a high-temperature reactor to carry out synchronous precipitation and separation of vanadium, iron and silicon at 90° C., then filter and separate to obtain residue and pickling solution, and the residue obtained is treated with chromium hydroxide The washing liquid is us...

Embodiment 2

[0067] The present embodiment provides a method for separating and recovering chromium from vanadium-chromium waste slag, said method comprising the following steps:

[0068] (1) Vanadium-chromium waste residue, chromium hydroxide washing solution and sulfuric acid are placed in an acid leaching reactor for acid leaching, the leaching temperature is 70° C., and the pH of the solution after leaching is 0.5;

[0069] (2) After the leaching reaction in step (1) is completed, sodium hypochlorite is added to the reaction system, the tetravalent vanadium is oxidized to pentavalent vanadium, and the ferrous iron is oxidized to ferric iron;

[0070] (3) The material after the oxidation reaction in step (2) is sent into a high-temperature reactor to carry out synchronous precipitation and separation of vanadium, iron and silicon at 120° C., then filter and separate to obtain residue and pickling solution, and the residue obtained is treated with chromium hydroxide The washing liquid is...

Embodiment 3

[0074] The present embodiment provides a method for separating and recovering chromium from vanadium-chromium waste slag, said method comprising the following steps:

[0075] (1) Vanadium-chromium waste residue, chromium hydroxide washing solution and hydrochloric acid are placed in an acid leaching reactor for acid leaching, the leaching temperature is 70° C., and the pH of the solution after leaching is 0.5;

[0076] (2) After the leaching reaction in the step (1) is completed, sodium chlorate is added to the reaction system, the tetravalent vanadium is oxidized to pentavalent vanadium, and the ferrous iron is oxidized to ferric iron;

[0077] (3) The material after the oxidation reaction in step (2) is sent into a high-temperature reactor to carry out synchronous precipitation and separation of vanadium, iron and silicon at 140° C., then filter and separate to obtain residue and pickling solution, and the residue obtained is treated with chromium hydroxide The washing liqui...

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Abstract

The invention provides a method for separating and recovering chromium from vanadium-chromium waste residues. The method comprises the following steps that (1) acid-soluble substances in the vanadium-chromium waste residues are leached with acid as a medium; (2) an oxidizing agent is added into a leaching reaction system for an oxidation reaction; (3) materials obtained after the oxidation reaction are fed into a reaction kettle for a vanadium-ferrum-silicon synchronous precipitation separation reaction at the temperature of 90-180 DEG C, so that residues and pickle liquor are obtained; (4) alkali is added into the obtained pickle liquor for deposition of chromium hydroxide, and solid-liquid separation is conducted, so that the chromium hydroxide and deposited mother liquor are obtained; and (5) a chromic oxide product is obtained after the obtained chromium hydroxide is washed, dried and incinerated, and byproduct salt is obtained after the obtained mother liquor is subjected to evaporative concentration and crystallization. According to the method for separating and recovering chromium from vanadium-chromium waste residues, the process is further shortened based on the prior art, technological operation is simple, synchronous separation of vanadium and chromium in the vanadium-chromium waste residues can be effectively achieved, and the chromic oxide product with higher additional value can be prepared.

Description

technical field [0001] The invention belongs to a hydrometallurgical process, and relates to a method for separating and recovering chromium from vanadium-chromium waste residue. Background technique [0002] The main product of vanadium chemical industry is vanadium pentoxide, and vanadium slag is the main raw material for producing vanadium pentoxide. The main method for extracting vanadium from vanadium slag is sodium roasting-water immersion-acid ammonium salt vanadium precipitation process. During the process of sodium roasting, about 10-20% of chromium and vanadium are simultaneously leached into the liquid phase, so after acid ammonium salt vanadium precipitation The wastewater contains chromium and unrecoverable vanadium, and the wastewater is reduced, alkali adjusted and filtered to produce vanadium-chromium waste residue. According to statistics, at present, domestic vanadium oxide production enterprises produce about 50,000 tons of vanadium-chromium waste slag ev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B34/32C22B34/22
CPCC22B7/007C22B7/04C22B34/22C22B34/32Y02P10/20
Inventor 张洋郑诗礼刘久传单宏图陈晓芳乔珊范兵强王晓健张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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