研究了采用干式磨矿—氧压浸出—铁粉还原—硫酸亚铁结晶—N1923萃取钛—P204萃取钒—沉淀钒—煅烧工艺从南非某钒钛磁铁矿中回收七水硫酸亚铁和五氧化二钒.结果表明:采用此工艺,矿石中84.77％ 的钛富集于氧压浸出渣中(品位41.35％),其他部分进入氧压浸出液内的钛和钒分别用N1923和P204萃取回收;流程无废气产生,浸出渣可作为钛白粉生产原料,洗水无外排且全部循环使用,"三废"达标.

某炭质钒矿石的V2O5品位为1.40％,研究了采用矿石预处理-硫酸浸出-P204+TBP+煤油萃取-氨水沉钒工艺从中提取五氧化二钒.实验结果表明:在矿石粒度-0.074 mm 12.79％,硫酸用量35％,浸出温度90℃条件下,钒浸出率达76％;对于含钒浸出液,用P204+TBP+煤油溶剂萃取和稀硫酸反萃取,氯酸钠氧化-氨水沉钒,沉淀物经烘干煅烧,最终得到纯度为97.14％的V2O5产品.

某石煤钒矿含V2O50.865％,主要矿物为石英,钾长石、绢云母、白云石、方解石含量较高,采用硫酸熟化—柱浸技术提取其中的钒.考察了矿石粒度、熟化和浸出工艺参数对钒浸出率的影响.结果表明,提钒的较优条件为原矿粒度-12 mm、熟化硫酸用量(对原矿)20％、熟化补水量(对原矿)6％、熟化温度125℃、熟化时间4 h、柱浸液速率0.25 mL/(h·g原矿)、喷淋时间24 h,在此条件下,产出的尾渣V2O5含量可降至0.15％,钒浸出率可达83.5％,柱浸液中Fe、Al2 O3、K2 O等杂质未出现明显累积.与常规搅拌浸出工艺相比,该工艺可降低硫酸用量,避免浸出过程中的冒槽,减轻浸出料浆的固液负荷.

Additive roasting-cyanide leaching process was adopted for treating manganese-silver ore. The rotary kiln was continuously operated for 80 hours, and the ore was roasted for 30±5 minutes. The results showed that the content of silver and manganese was 237.73 g/t and 24.68% in the calcine, and that the recovery of silver and manganese was 99.19% and 98.70%, respectively. The resulted calcine was leached in 500 L reactor with a solid liquid ratio of 2:1~2.2:1, 6~15 h of leaching time, and 700 g/t of NaCN. Leaching results showed that the leaching ratio of silver was up to 86.5%, and that the residue met the standards of manganese ore for metallurgy.