Method for deep separation of vanadium and molybdenum

A separation method and deep technology, applied in the field of deep separation of molybdenum and vanadium in solution, can solve the problems of long process flow, low recovery rate of vanadium and molybdenum, and inability to completely separate, so as to shorten the separation process, save material usage, and improve recovery efficiency high effect

Inactive Publication Date: 2013-12-04
大连融科储能集团股份有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

This method is suitable for solutions with a high concentration of vanadate, and the complete separation of vanadium molybdate cannot be achieved. After vanadium precipitation, the solution still contains a certain concentration of vanadium molybdate mixed solution
For the vanadium-molybdate solution with low concentration, in the traditional ion exchange, the vanadate and molybdate will be adsorbed by the resin at the

Method used

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Examples

Experimental program
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specific Embodiment approach

[0010] In conjunction with the following examples, the invention is further described:

[0011] A certain amount of molybdenum is mixed in the vanadium-containing raw materials. After the traditional hydrometallurgical vanadium extraction, the obtained wastewater contains both vanadium and molybdenum. Due to the precipitation of AMV, the concentration of vanadium in the mother liquor decreases and the ratio of vanadium to molybdenum increases significantly. Therefore, the separation of vanadium and molybdenum becomes very important for the production of high-purity vanadium products.

Embodiment 1

[0013] Take 3.5L containing vanadium, molybdenum solution V 2 o 5 =1.68g / l, Mo=0.51g / l, stir and add sulfuric acid to adjust the pH to 3, add hydrogen peroxide to adjust the potential to 580mv, stir until stable, contact with 100ml resin 996 at a flow rate of 200ml / h to adsorb molybdenum, and flow out the Mo concentration Reaching 0.02g / l is the end point of adsorption. By mass concentration: 2.5%NaOH+5.0%NaCl, 8%H 2 o 2 Analyze and regenerate the analytical agent at a flow rate of 100ml / h. The experimental results (g / l) of vanadium and molybdenum depth separation experiments in solutions containing vanadium and molybdenum are as follows:

[0014]

Embodiment 2

[0016] Take 3.5L containing vanadium, molybdenum solution V 2 o 5 =1.50g / l, Mo=0.41g / l, stir and add sulfuric acid to adjust the pH to 1.92, add Na 2 SO 3 Fully react, adjust the potential of the solution to 585mv by introducing air, contact with 100ml resin 921 at a flow rate of 200ml / h to adsorb molybdenum, and take the effluent Mo concentration to reach 0.02g / l as the adsorption end point. 2.5%NaOH+5.0%NaCl is used as the desorbent to desorb and regenerate at a flow rate of 100ml / h. The vanadium-molybdenum depth separation experiment results (g / l) of sodium vanadium molybdate solution are as follows:

[0017]

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Abstract

The invention discloses a method for deep separation of vanadium and molybdenum, which comprises three steps of presetting of the pH value of a solution, adjustment of the ion state and resin ion exchange separation analysis. Firstly, a persulfate solution containing vanadium and molybdenum is adjusted to reach the proper value by using sulfuric acid, the oxidation reduction potential of the solution is adjusted through adding reducing agent and oxidizing agent, the valence states and ionic conditions of vanadium and molybdenum are adjusted, vanadium is reduced into V (IV) from V (V), and exists in the form of VO<2+>, molybdenum exists in the form of sexavalence anion, then obtained solution continuously passes through exchange columns of the strong-base anion exchange resin, the exchange speed is controlled as per the contact time of 20-30 minutes, the adsorption effect is adjusted according to the concentration of Mo of the effluent, and the loaded resin is recycled after being analyzed. The method has the advantages that through changing the existing valence states of vanadium and molybdenum, vanadium and molybdenum exist in different hydrated ion forms and through selective adsorption of the resin, the deep separation of vanadium and molybdenum can be realized.

Description

Technical field: [0001] The invention relates to a method for deep separation of vanadium and molybdenum in a solution, and is particularly suitable for deep separation of solutions containing vanadium and molybdenum in the vanadium chemical production process. Background technique: [0002] Due to their similar chemical properties, vanadium and molybdenum are difficult to separate when molybdenum is present in the hydrometallurgical extraction of vanadium. The traditional vanadium-molybdenum separation method is to add ammonium salt to the vanadium-molybdate solution to cause vanadium to form vanadate precipitation, so as to achieve the separation effect of vanadium-molybdate. This method is suitable for solutions with high concentration of vanadate, and the complete separation of vanadium molybdate cannot be realized, and the solution still contains a certain concentration of vanadium molybdate mixed solution after vanadium precipitation. For the vanadium molybdate soluti...

Claims

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Application Information

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IPC IPC(8): C22B3/42C22B34/34C22B34/22
CPCY02P10/20
Inventor 陈彦博宋明明李晓侠郝玥
Owner 大连融科储能集团股份有限公司
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