(昆明理工大學(xué) 材料與冶金工程學(xué)院，昆明 650093)
摘 要: 提出一種在加壓條件下酸浸黑色頁巖型礦提取釩的新工藝，研究浸出過程中各種工藝參數(shù)對釩浸出率指標(biāo)的影響，同時(shí)進(jìn)行了兩段逆流浸出實(shí)驗(yàn)；利用電子探針分析礦石中釩在各物相中的分配情況，并在兩段逆流浸出基礎(chǔ)上進(jìn)一步強(qiáng)化實(shí)驗(yàn)條件，考察了釩浸出率與礦石中釩賦存狀態(tài)之間的關(guān)系。結(jié)果表明：該工藝的最佳工藝參數(shù)如下，即時(shí)間3 h、溫度150 ℃、液固比1.2׃1、硫酸用量25%、85%礦石粒度粒經(jīng)小于0.095 mm；在此條件下，釩的一段浸出率為77%左右，而礦石經(jīng)過兩段逆流浸出后，釩浸出率可達(dá)90%；釩浸出率與礦石中難溶硅鋁酸鹽相中的釩占有率呈現(xiàn)消長關(guān)系。
關(guān)鍵字: 石煤；氧壓酸浸；硫酸亞鐵；釩；浸出率
pressure acid leaching
（College of Material and Metallurgical Engineering, Kunming University of Science and Technology,
Kunming 650093, China）
Abstract:A new technique of recovery of vanadium from black shale by pressure acid leaching was investigated. The influences of changing parameters of pressure acid leaching process on the leaching rate of vanadium were discussed, and the experiment of two-step countercurrent leaching was developed. The distribution of vanadium in black shale was analyzed by SEM and the leaching conditions was strengthened on the foundation of two-step countercurrent leaching. The results show that the optimal parameters of this technique are as time of 3 h, temperature of 150 ℃, ratio of liquor to solid of 1.2׃1, H2SO4 additions of 25%, 85% material granularity of 0.095 mm. The one-step leaching percent of vanadium can reach 77%, the leaching percent obtain 90% after two-step countercurrent leaching. The vanadium leaching percent have growth and decline relation to occupation ratio of vanadium in in-soluble silicoaluminate mineral.
Key words: black shale; acid pressure leaching; ferrous sulfate; vanadium; leaching rate
