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A New Technology of Extracting Vanadium from Stone Coal by Sodium Roasting

Author: XiaoCaiXia
Tutor: WangXueWen；WangMingYu
School: Central South University
Course: Non-ferrous metallurgy
Keywords: Vanadium Bone coal Sodium roasting Acid leaching Separation of vanadium silicon
CLC: TF841.3
Type: Master's thesis
Year: 2011
Downloads: 159
Quote: 3
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Abstract


Stone coal as raw material , additives with lime , sodium roasting Vanadium Extraction of stone coal , forming a stone coal calcium-fortified solid sodium chloride calcined vanadium extraction process , the process including stone coal fortified solid sodium chloride roasting - the calcine low acid leaching leaching solution enrichment and separation of vanadium and other major processes . The stone coal calcium-fortified solid sodium chloride roasting process focuses examine additive , calcination temperature and baking time on the leaching rate of vanadium . The results show that a certain amount of lime roasting process HCl and Cl2 and stone coal in iron, aluminum , calcium can combine to generate less volatile compounds curing , thus greatly reducing the vanadium extraction sodium roasting smoke the burden of cleaning , and does not adversely affect the leaching of vanadium . Sodium chloride is added in an amount of 13 % of the quality of the stone coal , CaO / NaCl molar ratio of 0.43 , the 790 ° C calcined 3h , the the chlorine evaporation rate of only 17.3% , and under the same conditions without calcium stone coal sodium roasting process chlorine evaporation rate was 37.9% . The process of the the calcine low acid leaching of the amount of sulfuric acid , liquid to solid ratio , leaching temperature and leaching time on the leaching rate of vanadium . The experimental results show the influence of vanadium leaching rate is the maximum amount of sulfuric acid is added and the leaching temperature , with the increase in the amount of sulfuric acid is added , the vanadium leaching rate ; with leaching temperature rises , the vanadium leaching rate . Calcine optimum leaching conditions were as follows : 5.5% of the amount of sulfuric acid , room temperature leaching 1h , liquid to solid ratio 2:1 ; optimal conditions vanadium leaching rate of 71.54% . Leaching solution enrichment and separation of vanadium ion exchange enrichment and analytical solution of vanadium silicon separation of the two parts . D314 ion exchange resin adsorption enrichment of vanadium leaching solution , negative the vanadium resin with 2 mol / L NaOH solution to resolve . It was found that the ion exchange can be effective separation of vanadium and phosphorus with silicon , but not completely separated , silicon and vanadium in the analytic solution in the pH value of 2-13 may be formed within the heteropolyacid . And the hydrolysis method , the precipitation of magnesium silicate precipitation and aluminosilicate are three methods for the removal of the silicon of a comparative study , the results showed that the sodium aluminosilicate precipitation method is the most effective removal of the vanadate solution silicon methods . Vanadate was added purified ammonium salt precipitation of ammonium metavanadate , ammonium metavanadate by calcination at 500 ℃ 2h V205 product purity of 98.7 % .

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Rare metal smelting > Refractory metals smelting ( high - temperature molten metal ) > Vanadium
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