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Method for acid leaching extraction of vanadium from vanadium-containing raw material

A technology of acid leaching and raw materials, which is applied in the field of vanadium extraction from vanadium-containing raw materials, can solve the problems of vanadium-containing filter residue without vanadium recovery, complicated operation, and long soaking time of pellets, so as to improve the comprehensive recovery rate of vanadium and solve the problem of Discharge pollutes the environment and improves the production efficiency of vanadium extraction

Inactive Publication Date: 2009-08-19
PANGANG GROUP RESEARCH INSTITUTE CO LTD +3
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the initial pH of the acid leaching reaction system is low (1.1-1.2), a large amount of impurities will enter the solution under this acid leaching condition, especially the entry of phosphorus is unfavorable to the ion exchange purification and enrichment of vanadium solution; The vanadium-containing filter residue obtained after the liquid pH value is not recovered; the ion exchange residual liquid is directly returned to acid leaching for recycling, and some anions such as PO 4 3- , SO 4 2- , Cl - etc. will enrich and affect the ion exchange
The disadvantages of this method are: the initial pH of the acid leaching reaction system is low; when using hydrochloric acid for acid leaching, a large amount of chloride ions are brought in, which is not conducive to the recycling and ion exchange of vanadium extraction wastewater, and requires higher anti-corrosion performance of the equipment.
The disadvantages of this method are: the initial pH of the acid leaching reaction system is low; the operation in the acid leaching reaction process is complicated; the chloride ion in the solution will be continuously enriched by using a chloride-type anion exchange resin for ion exchange, which is not conducive to the recycling of vanadium extraction wastewater
The disadvantages of this method are: the pellet soaking time is long, the efficiency is low, and the floor area is large
The disadvantage of this method is: it is not suitable for the treatment of acidic solution, and harmful gas H will be released under acidic conditions. 2 S, and reduced pentavalent vanadium
In addition, chlorine-type anion-exchange resins are used for ion exchange. With the increase in the number of cycles of the ion-exchange residual liquid, the concentration of chloride ions in the solution to a certain extent will affect the adsorption of vanadium by the ion-exchange resin. The final solution must be Discharge treatment is not conducive to the recycling of vanadium extraction wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Extraction of vanadium by acid leaching of vanadium-containing raw materials

[0026] Take by weighing 1000g water and the powdery vanadium-containing raw material (main component: V 2 o 5 : 1.15%, SiO 2 : 88.76%, P: 0.491%, CaO2 o 3 : 1.47%) was added into the acid leaching reaction tank, stirred evenly at normal temperature, then the pH value of the acid leaching reaction system was adjusted to be constant at 2.5 to 3.3 with sulfuric acid with a mass fraction of 20%, and the stirring reaction was continued for 60 minutes. The mixture in the acid leaching reaction tank is filtered with a vacuum filtration device and washed with water to obtain tailings and 1350mL of acid leaching solution. The main component of the acid leaching solution is V 2 o 5 : 3.45g / L, SiO 2 : 1.70g / L, P: 0.104g / L, Ca 2+ 2+ 3+2 o 5 : 2.97g / L, SiO 2 : 0.34g / L, P2 o 5 : 2.61g / L, SiO 2 : 0.24g / L, P: 0.028g / L, the filtrate c is mixed with the filtrate a obtained after adjusting t...

Embodiment 2

[0027] Example 2 Extraction of vanadium by acid leaching of vanadium-containing raw materials

[0028] Take by weighing 1000g water and the powdery vanadium-containing raw material (main component: V 2 o 5 : 1.09%, SiO 2 : 84.36%, P: 0.467%, CaO: 4.22%, MgO: 1.85%, TFe: 1.15%, AL 2 o 3 : 1.40%), added to the acid leaching reaction tank, heated to 60°C and stirred evenly, then adjusted the pH of the acid leaching reaction system to be constant at 2.5 to 3.3 with sulfuric acid with a mass fraction of 60%, and continued to stir for 40 minutes. The mixture in the acid leaching reaction tank was filtered and washed with a vacuum filtration device to obtain tailings and 1281mL of acid leaching solution. The main component of the acid leaching solution was V 2 o 5 : 3.36g / L, SiO 2 : 2.14g / L, P: 0.026g / L, Ca 2+ 2+ 3+ 2 o 5 : 2.82g / L, SiO 2 : 0.32g / L, P: 4 2- Type anion exchange resin for ion exchange, the remaining liquid collected by ion exchange is adjusted to pH = 6-8 wit...

Embodiment 3

[0030] Example 3 Extraction of vanadium by acid leaching of vanadium-containing raw materials

[0031] Take by weighing 2000g water and the powdery vanadium-containing raw material (main component: V 2 o 5 : 1.09%, SiO 2 : 84.36%, P: 0.467%, CaO: 4.22%, MgO: 1.85%, TFe: 1.15%, AL 2 o 3 : 1.40% was added into the acid leaching reaction tank, heated to 40°C and stirred evenly, then the pH of the acid leaching reaction system was adjusted to be constant at 2.5 to 3.3 with sulfuric acid with a mass fraction of 40%, and the stirring reaction was continued for 90 minutes. The mixture in the acid leaching reaction tank was filtered and washed with a vacuum filtration device to obtain tailings and 2443mL of acid leaching solution. The main component of the acid leaching solution was V 2 o 5 : 3.57g / L, SiO 2 : 2.07g / L, P: 0.038g / L, Ca 2+ 2+ 3+ 2 o 5 : 2.96g / L, SiO 2 : 0.28g / L, P2 o 5 : 2.68g / L, SiO 2 : 0.21g / L, P: 0.030g / L, the filtrate c is mixed with the filtrate a obtaine...

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Abstract

The invention relates to a method for extracting vanadium(V) from vanadium-containing materials, in particular to a method for acid-leaching vanadium from the vanadium-containing materials. The method comprises the following steps: a. adding water to the vanadium-containing materials and evenly stirring; gradually adding sulfuric acid with the mass fraction being 20% to 60% to adjust the pH value of the acid-leaching reaction system to 2.5 to 3.3; and filtering to obtain residue and acid-leaching solution upon completion of acid-leaching; and b. leaching vanadium from the acid-leaching solution obtained in Step a with SO4 type anion exchange resin by ion-exchange. The method can effectively prevent ions, such as Fe, Mg, Al, Mn, P, Cr and the like, in the vanadium-containing materials from entering the acid-leaching solution during acid-leaching process and greatly reduce the pressure on the subsequent purification of the acid-leaching solution; and the ion-exchange raffinate can be recycled in the acid-leaching step, thereby increasing the overall recovery rate of vanadium and avoiding problems in environmental pollution caused by discharging a large quantity of vanadium-leaching waste water.

Description

technical field [0001] The invention relates to a method for extracting vanadium in vanadium-containing raw materials. Background technique [0002] Vanadium is an important strategic substance, mainly used in iron and steel industry, advanced defense technology, chemical industry and light textile industry and other fields. At present, the main raw material used to produce vanadium is vanadium-titanium magnetite, in addition to low-grade vanadium raw materials, such as paragenetic ore containing vanadium, stone coal, waste catalyst containing vanadium and petroleum slag. [0003] my country's research on the development and utilization of low-grade vanadium raw materials was earlier, but the processes currently used in industrial production mainly include sodium roasting - water leaching (or acid leaching) - ion exchange and raw ore (or blank roasting clinker, calcification roasting cooked material)——acid leaching——ion exchange (or extraction) two kinds, the vanadium extrac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B3/42C22B34/22
Inventor 付自碧彭毅孙朝晖张林
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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