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Method for preparing vanadium pentoxide

A technology of vanadium pentoxide and preparation process, applied in the field of vanadium pentoxide preparation, can solve the problems of reducing the economic value of vanadium products, affecting the purity of vanadium pentoxide, etc., and achieves the advantages of simple process, good impurity control, and improved economic value. Effect

Active Publication Date: 2011-07-13
BEIJING GENERAL RES INST OF MINING & METALLURGY
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Problems solved by technology

[0006] In the current existing process, no matter whether it is using P204 extraction or D201 resin adsorption, it is impossible to avoid impurity metal elements from entering the vanadium pentoxide product
Therefore, if the stripping solution or desorption solution that has not been specially treated is used for vanadium precipitation, the purity of the product vanadium pentoxide will be seriously affected, and only vanadium pentoxide containing 2 o 5 98% of the products, greatly reducing the economic value of vanadium products

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preparation example Construction

[0024] A method for preparing vanadium pentoxide. The preparation process is to use raw materials such as stone coal and vanadium slag, and use methods such as sulfuric acid direct leaching, sulfuric acid pressure leaching, roasting-acid leaching, etc. to obtain vanadium-containing 0.5-50g / L acidic The solution is the raw material, and the solution can contain Fe 2+ , Fe 3+ 、Al 3+ , Zn 2+ , Mg 2+ , Ca 2+ and other impurity ions, the vanadium in the solution must be three or four valent, if there is pentavalent vanadium, add reducing agent such as iron powder or sodium sulfite to reduce, control the solution potential 100 ~ 350mV, so that the pentavalent vanadium in the solution is basically reduced to 4 Valence, to ensure the precipitation rate of vanadium. Its steps include:

[0025] (1) Shen vanadium

[0026] The vanadium-containing solution was treated with CaCO 3 , CaO, MgO, MgCO 3 , NaOH, Na 2 CO 3 Adjust the pH to 4.0-4.5 with alkaline substances, react at 20°...

Embodiment 1

[0034] (1) A vanadium-containing solution obtained by direct sulfuric acid leaching of a stone coal vanadium ore, its composition is V1.69g / L, Fe 5.32g / L, Al 8.56g / L, Mg 2.82g / L, Zn 1.58g / L , Ca 0.70g / L, K 2.35g / L. The potential of the solution is 310mV, add CaCO3 at room temperature to adjust the pH to 4.3, age for 2 hours, filter to obtain the filter residue and filtrate, the vanadium concentration in the filtrate is 0.025g / L, and the vanadium content in the filter residue is 4.54%;

[0035] (2) Take the filter residue obtained by precipitation of vanadium for oxidative alkali leaching. The ratio of alkali leaching liquid to solid is 4:1. The oxidant is sodium chlorate. Add 1.04 times the theoretical amount. 3h, filter to obtain the alkaline immersion solution containing vanadium 11.58g / L;

[0036] (3) Neutralize the alkaline immersion solution with sulfuric acid to pH = 2.0, add 2 times the theoretical amount of ammonium sulfate at the same time, raise the temperature to 8...

Embodiment 2

[0039] (1) A vanadium-containing solution obtained from a stone coal vanadium ore through sulfuric acid pressure oxidation leaching, its composition is V1.89g / L, Fe 4.25g / L, Al 4.55g / L, Mg 4.60g / L, Zn 0.80g / L, Ca 0.70g / L, K 2.35g / L, the potential of the solution is 420mV, add iron powder to control the potential of the solution to 120mV, then add MgO to adjust the pH to 4.5, age at room temperature for 2h, filter to obtain the filter residue and filtrate , the vanadium content in the filtrate is 0.05g / L, and the vanadium content in the filter residue is 11.32%;

[0040](2) Take the filter residue obtained by precipitation of vanadium and carry out oxidative alkali leaching. The liquid-solid ratio of alkali leaching is 10:1. Add hydrogen peroxide which is 2 times the theoretical amount. The pH of alkali leaching is controlled to be 7.0-8.0, and the oxidation potential is 950mV to obtain vanadium-containing 10.03g / L of alkaline immersion solution;

[0041] (3) Neutralize the ...

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Abstract

The invention relates to a method for preparing vanadium pentoxide, relates to a vanadium-containing acidic solution, in particular to a method for producing high purity vanadium pentoxide by treating the vanadium-containing acid leaching liquid of stone coal vanadium ore. The method is characterized in that the preparation process comprises the following steps: (1) adjusting the pH value of the vanadium-containing acidic solution to 4.0-4.5, precipitating, filtering; (2) performing oxidation and alkaline leaching to obtain alkaline leaching liquid and slag; (3) adjusting the pH value of the alkaline leaching liquid to 1.8-2.2, then adding ammonium salt to perform vanadium-precipitating reaction and prepare ammonium vanadate vanadium slag; and (4) calcining ammonium vanadate vanadium slag to prepare vanadium pentoxide. The method can be used to treat the stone coal vanadium ore leaching liquid with low vanadium concentration and the vanadium solution with high vanadium concentration; the flow is simple, the investment is lower than that of the traditional process; and impurities can be controlled well, high purity vanadium pentoxide can be obtained and the economic value of the product can be effectively increased.

Description

technical field [0001] The invention relates to a method for preparing vanadium pentoxide, which relates to a method for producing high-purity vanadium pentoxide by using a vanadium-containing acid solution, especially a vanadium-containing acid leaching solution for treating stone coal vanadium ore. technical background [0002] Vanadium has a high melting point and is often called refractory metal together with niobium, tantalum, tungsten and molybdenum. It has good ductility, hard quality, resistance to hydrochloric acid and sulfuric acid, and better resistance to gas-salt-water corrosion than most stainless steels. Therefore, vanadium is widely used in metallurgy, chemical industry and steel industry. With the rapid development of my country's modernization, the demand for vanadium and its compounds is increasing. [0003] my country's vanadium resources are mainly contained in stone coal vanadium ore. It is estimated that the vanadium reserves in my country's stone c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B34/22
CPCY02P10/20
Inventor 王成彦尹飞居中军杨永强李强陈永强揭晓武阮书峰王军王振文
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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