A method for synchronously removing iron and vanadium from trivalent chromium acid solution

A technology of acidic solution and trivalent chromium, applied in the direction of improving process efficiency, etc., can solve problems such as complex process and low removal efficiency, and achieve the effect of shortening the process

Active Publication Date: 2019-09-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems in the prior art that the removal efficiency of vanadium and iron is low and the process of removing vanadium and iron is complicated, the present invention provides a method for synchronously removing iron and vanadium from trivalent chromium acidic solution, The method further reduces the process on the basis of the prior art, the process operation is simple, and the removal of iron and vanadium in the trivalent chromium solution can be effectively realized

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  • A method for synchronously removing iron and vanadium from trivalent chromium acid solution

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Embodiment 1

[0026] This embodiment provides a method for synchronously removing iron and vanadium from trivalent chromium acidic solution, said method comprising the following steps:

[0027] (1) Add ferrous sulfate to the trivalent chromium acid solution with low iron and high vanadium (molar concentration) to adjust the molar ratio of iron to vanadium to 1:1, and adjust the pH of the solution to 1.2;

[0028] (2) Add hydrogen peroxide to the trivalent chromium acidic solution, iron and vanadium are oxidized to trivalent and pentavalent states respectively, and chromium keeps trivalent unchanged;

[0029] (3) Add ferric vanadate to react at 60 ℃ as crystallization inducer in the solution after oxidation, realize the co-precipitation of iron and vanadium; Iron, vanadium precipitation rate is greater than 90%, and iron concentration in the solution after precipitation is less than 0.2g / L, the concentration of vanadium is less than 0.15g / L.

Embodiment 2

[0031] This embodiment provides a method for synchronously removing iron and vanadium from trivalent chromium acidic solution, said method comprising the following steps:

[0032] (1) Add ferric sulfate to the trivalent chromium acid solution with low iron and high vanadium (molar concentration) to adjust the molar ratio of iron to vanadium to 1:1, and adjust the pH of the solution to 1.2;

[0033] (2) sodium hypochlorite is added in trivalent chromium acidic solution, iron and vanadium are oxidized to trivalent and pentavalent states respectively, and chromium keeps trivalent unchanged;

[0034] (3) Add ferric vanadate to react at 80 ℃ as crystallization inducer in the solution after oxidation, realize the co-precipitation of iron and vanadium; Iron, vanadium precipitation rate is greater than 90%, and iron concentration in the solution after precipitation is less than 0.2g / L, the concentration of vanadium is less than 0.15g / L.

Embodiment 3

[0036] This embodiment provides a method for synchronously removing iron and vanadium from trivalent chromium acidic solution, said method comprising the following steps:

[0037] (1) Add ferric chloride to the trivalent chromium acid solution with low iron and high vanadium (molar concentration) to adjust the molar ratio of iron to vanadium to 1:1, and adjust the pH of the solution to 2.5;

[0038] (2) sodium chlorate is added in trivalent chromium acid solution, iron and vanadium are oxidized to trivalent and pentavalent states respectively, and chromium keeps trivalent unchanged;

[0039] (3) Add ferric hydroxide to the oxidized solution as a crystallization inducer to react at 60°C to realize co-precipitation of iron and vanadium; the precipitation rate of iron and vanadium is greater than 90%, and the concentration of iron in the solution after precipitation is less than 0.2g / L, the concentration of vanadium is less than 0.15g / L.

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Abstract

The invention provides a method for synchronously removing iron and vanadium from a trivalent chromium acid solution. The method comprises the following steps that (1) the mole ratio of iron and vanadium in the trivalent chromium acid solution is prepared to 1:1 by adding an iron source or a vanadium source, and the solution pH is adjusted to 1.2-2.5; (2) an oxidizing agent is added into the trivalent chromium acid solution, iron is oxidized to a trivalent state, vanadium is oxidized to a pentavalent state, and chromium is maintained in a trivalent state; and (3) a crystallization inducer is added into an oxidized solution for reaction at a certain temperature, and coprecipitation of iron and vanadium is achieved. According to the method, the technological process is further shortened on the basis of the prior art, technological operation is simple, and iron and vanadium can be effectively removed from the trivalent chromium acid solution.

Description

technical field [0001] The invention belongs to hydrometallurgical process and relates to a method for synchronously removing iron and vanadium from trivalent chromium acid solution. Background technique [0002] Trivalent chromium acidic solution has a wide range of sources, such as the acid solution produced by the reaction of vanadium-chromium slag, high-carbon ferrochrome, chromite and other chromium-containing raw materials or waste residues in the vanadium metallurgy industry with sulfuric acid, hydrochloric acid or nitric acid, as well as chromium- and iron-containing Acid waste water, etc. Since the raw materials generally contain iron and vanadium, the trivalent chromium acidic solution contains iron and vanadium ions. The trivalent chromium acidic solution containing iron and vanadium can be directly used to produce trivalent chromium salt products after removing iron and vanadium. The traditional alkaline chromium salt production method needs to use hexavalent c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B34/22C22B34/32
CPCC22B3/44C22B34/22C22B34/32Y02P10/20
Inventor 张洋郑诗礼王晓健范兵强乔珊陈晓芳
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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