Process for leaching vanadium out of stone coal by using oxidant and sulfuric acid

An oxidant and sulfuric acid technology, applied in the direction of improving process efficiency, can solve the problems of large amount of HCl gas, low vanadium conversion rate, large amount of NaCl added, etc., and achieve the advantages of simplifying the process, reducing energy consumption, and improving vanadium leaching rate. Effect

Inactive Publication Date: 2013-01-30
JISHOU UNIVERSITY +1
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Problems solved by technology

The traditional domestic vanadium extraction process is salt sodium roasting process. Due to the low grade of vanadium-containing stone coal and the large amount of NaCl added, the roasting process produces Cl-containing 2 The large amount of HCl gas and HCl gas cause serious environmental pollution. The high cost of flue gas purification is a major obstacle to the environmental protection of the production process of vanadium extraction by sodium roasting of stone coal, and the recovery rate of vanadium is low and the waste of resources is serious.
[0003] With the increasingly stringent environmental protection requirements of relevant national departments, the traditional stone coal vanadium extraction process is too polluting and the vanadium conversion rate is not high

Method used

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  • Process for leaching vanadium out of stone coal by using oxidant and sulfuric acid

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Embodiment 1

[0014] (1) Crushing and ball milling and sieving: the stone coal mine is crushed and ball milled until it passes through a 100-mesh sieve. (2) Oxidant synergistic sulfuric acid leaching: control the addition of water and sulfuric acid according to the solid-liquid ratio of 1:0.5-5, put the ore powder into the acid leaching tank, and add NaNO according to the weight ratio of oxidant and stone coal 0.5-15% 2 , control the concentration of sulfuric acid to 10-35%, stir evenly, leaching at 10-100°C for 1-15 hours, and filter and separate. (3) Deep oxidation: add a certain amount of sodium chlorate solution to deeply oxidize the vanadium-containing filtrate, so that tetravalent vanadium is completely oxidized to pentavalent vanadium. (4) Ion exchange separation and enrichment: use strong basic macroporous anion exchange resin to absorb vanadium solution, and then use 10% NaOH and 5% NaCl mixed solution for desorption. (5) Precipitate vanadium: use NH to desorb the vanadium-contain...

Embodiment 2

[0016] According to the above steps of crushing ball milling and sieving, oxidant synergistic sulfuric acid leaching, deep oxidation, ion exchange separation and enrichment, vanadium precipitation, calcination and other steps in sequence, in which in the batching process, the oxidant added to the stone coal powder is KNO 2 , the weight is 5% of the ore powder, and the leaching rate of stone coal is 95%.

Embodiment 3

[0018] According to the above steps of crushing ball milling and sieving, oxidant synergistic sulfuric acid leaching, deep oxidation, ion exchange separation and enrichment, vanadium precipitation, calcination and other steps, the oxidant added to the stone coal ore powder is Ca(NO 2 ) 2 , the weight is 3% of the ore powder, and the leaching rate of stone coal is 95%.

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Abstract

The invention discloses a process for leaching vanadium out of stone coal by using an oxidant and sulfuric acid. The process comprises the following steps of: crushing the stone coal, ball-grinding and sieving the crushed stone coal, leaching by using the oxidant and the sulfuric acid, deeply oxidizing, carrying out ion-exchange, carrying out molybdenum precipitation with an ammonium salt, calcining and the like to prepare a V2O5 product. The process is characterized in that the oxidant is a nitrite such as NaNO2, KNO2 and Ca(NO2)2, the consumption of the oxidant is 0.5-15 percent of the weight of stone coal mineral powder, the leaching rate of vanadium is above 95 percent, and the recycling rate of the vanadium is more than 80 percent. Compared with the traditional process for leaching the vanadium, the process has the advantage that the leaching rate of the vanadium is increased by 10-25 percent. The process has the advantages of eliminating pollution of Cl2 and HCl gases to the environment, saving energy resources, and greatly increasing leaching rate and recycling rate of the vanadium because a technology of leaching vanadium by using oxidized acid is adopted and a roasting process is eliminated.

Description

technical field [0001] The invention relates to a process for leaching vanadium in stone coal with oxidant and sulfuric acid. Background technique [0002] Stone coal is a low-grade vanadium-bearing ore, and there is no economical and effective beneficiation method to enrich the vanadium in it. Although the total reserves of stone coal in my country are large, there are no large deposits in various places, and there are great differences in the characteristics of stone coal in various regions, which makes the technology of vanadium extraction from stone coal diverse. However, for stone coal mines, the difficulty and The key is the ore decomposition process, that is, the leaching process of vanadium in stone coal from solid phase to liquid phase. The traditional domestic vanadium extraction process is salt sodium roasting process. Due to the low grade of vanadium-containing stone coal and the large amount of NaCl added, the roasting process produces Cl-containing 2 The amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B34/22
CPCY02P10/20
Inventor 颜文斌华骏高峰蔡俊何新波
Owner JISHOU UNIVERSITY
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