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| Solvent Extraction of Sulfuric Acid from Acid Leaching Solution of Stone Coal |
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Received:May 31, 2016
Revised:June 02, 2016
Accepted:June 06, 2016
Published Online:October 21, 2016
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| DOI：doi：10.3969/j.issn.1007-7545.2016.01.008 |
| KeyWord:stone coal; acid leaching solution; sulfuric acid; solvent extraction; separation |
| Author | Institution |
| Yang Xiao |
武汉理工大学 |
| Zhang Yimin |
武汉理工大学 |
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| Download times: 1861 |
| Abstract: |
| Separation of residue sulfuric acid prior to vanadium extraction from acid leaching solution of stone coal was performed by solvent extraction. Effects of reductant sodium sulfite dosage, extractant tri-octyl amine concentration, temperature, and reaction duration on extraction rate of sulfuric acid were investigated. The results show that sulfuric acid concentration in leaching solution drops from 110 g/L to 5.25 g/L after four-stage extraction under the optimum conditions including sodium sulfite dosage of 2 g/L, tri-octyl amine concentration of 40%, temperature of 25 ℃, reaction duration of 2 min, and O/A=1/1. PH value of leaching solution reaching to 2.3 can be directly used in vanadium extraction. Stripping efficiency of sulfuric acid is 99% above after five-stage stripping with 60 ℃water as strip extractant at O/A=1/3. No additional agents are consumed in extraction process, the organic phase can be recycled and recovered sulfuric acid can be reused. |
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