CAJ | 학술논문

采用碱浸预处理-酸浸提钒的两段浸出工艺从含钒粘土矿中浸出钒,考察了碱浸预处理工序中NaOH用量和浸出时间、预处理后酸浸工序中H_2SO_4用量、浸出温度、浸出时间、液固比等因素对钒浸出率的影响.碱浸预处理能部分溶解Si、Al矿物,从而破坏含钒矿物晶体结构,为酸浸提钒时提高钒浸出率并降低酸耗创造条件.实验结果表明,在95 ℃温度下用20%NaOH对矿样浸出24 h后,酸浸工序中H_2SO_4用量30%,温度95 ℃,液固比1.5∶1,浸出时间12 h,钒浸取率达到了80%以上.
채용감침예처리-산침제범적량단침출공예종함범점토광중침출범,고찰료감침예처리공서중NaOH용량화침출시간、예처리후산침공서중H_2SO_4용량、침출온도、침출시간、액고비등인소대범침출솔적영향.감침예처리능부분용해Si、Al광물,종이파배함범광물정체결구,위산침제범시제고범침출솔병강저산모창조조건.실험결과표명,재95 ℃온도하용20%NaOH대광양침출24 h후,산침공서중H_2SO_4용량30%,온도95 ℃,액고비1.5∶1,침출시간12 h,범침취솔체도료80%이상.
The vanadium(V) was extracted from vanadium-bearing clay sample through two-stage leaching process by alkaline leaching pretreatment and acid leaching. The effect of NaOH dosage and leaching time in the alkalibe leaching pretreatment and H_2SO_4 dosage, leaching temperature, leaching time and liquid-solid ratio in the acid leaching on the vanadium leaching rate were measured. It was found that Si and Al minerals were partly dissolved in the alkaline leaching pretreatment process, which resulted in a crystal structure breakage of the vanadium-containing minerals and created conditions for improving V leaching rate and decreasing acid consumption in the acid leaching step. The result shows that the sample was pretreated for 24 h in 20% of NaOH solutions at 95 ℃, and then leached for 12 h in terms of 30% H_2SO_4, extracted from the clay.