کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6658958 | 1425527 | 2018 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A clean technology to separate and recover vanadium and chromium from chromate solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
In this work, a clean technology is introduced to separate and recover vanadium and chromium from vanadium-containing chromate solution. It was found that vanadium can be precipitated from vanadium-containing chromate solution by hydrolysis. The hydrolysate is the mixture of polyvanadic acid and sodium polyvanadate. The concentration of V in the solution can be decreased to 0.76â¯g/L under pHâ¯2.0 at 95â¯Â°C. The Na in the mixture can be effectively removed by washing with (NH4)2SO4 solution as the bind of NH4-VO3 is stronger than that of Na-VO3. The V2O5 with purity 98.6% was acquired by calcining the washed mixture. The vanadium residue in precipitated solution can be completely removed by adding Fe2+ or Fe3+ to form iron vanadate under pHâ¯3.8-4.5. The chromium in the V free solution was reduced from Cr(VI) to Cr(III) with Na2SO3, and then the precipitate of Cr2O3âxH2O was formed under pH above 8.5 at 90â¯Â°C. At last, the Cr2O3 with purity 98.7% was obtained by the treatment of the chromic oxide hydrate. Using the process above, the generation of V-Cr-bearing reducing slag and the mixture of Na2SO4 and (NH4)2SO4 can be avoided in vanadium pentoxide production from vanadium-containing chromate solution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 177, May 2018, Pages 94-99
Journal: Hydrometallurgy - Volume 177, May 2018, Pages 94-99
نویسندگان
Xuewen Wang, Huaguang Wang, Daxiong Gao, Bianfang Chen, Yuqi Meng, Mingyu Wang,