助浸剂强化浸出低品位石煤钒矿  

Enhanced Leaching of Low Grade Vanadium-bearing Stone Coal by Leaching Agent

作　　者：李崇 陈延信[1] 赵博[1] 酒少武[1] 姚艳飞[1] LI Chong;CHEN Yanxin;ZHAO Bo;JIU Shaowu;YAO Yanfei(College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055

出　　处：《材料科学与工程学报》2022年第5期865-871,共7页Journal of Materials Science and Engineering

摘　　要：本研究对某硅质低品位石煤钒矿采用助浸剂强化钒的浸出开展了多因素酸浸过程特征试验。结果表明:该矿石中钒浸出率与浸出温度、浸出时间、硫酸浓度、助浸剂掺量正相关;在硫酸浓度为20%、浸出温度为90℃,添加1.5%NaF浸出60 min条件下,钒浸出率高达90.89%。以NaF为助浸剂浸出后矿石颗粒表面结构破坏显著,助浸剂强化浸出与直接酸浸相比浸出率升幅大于40%,这说明钒元素在NaF协同硫酸强化浸出作用下迁移效果明显。浸出过程分为两阶段,第一阶段(30 min前)受化学反应控制,活化能为45.5 kJ/mol;第二阶段(30 min后)由化学反应控制转为内扩散控制或混合控制转化。The characteristics of acid leaching process of siliceous low-grade stone coal vanadium ore in Shaanxi Province were studied. The leaching of vanadium was enhanced by leaching agent. The results show that the leaching rate of vanadium in the ore is positively correlated with leaching temperature, leaching time, sulfuric acid concentration and the amount of leaching agent. The leaching rate of vanadium can reach 90.89% when the concentration of sulfuric acid is 20%, the leaching temperature is 90 ℃, the dosage of NaF is 1.5% 60 min. The surface structure of ore particles was destroyed obviously after leaching with NaF as the additive. Compared with the direct acid leaching, the leaching rate of enhanced leaching is increased by more than 40%, which indicates that the migration effect of vanadium element is obvious under the effect of NaF and sulfuric acid enhanced leaching. The leaching process is divided into two stages. The first stage(30 min ago) is controlled by chemical reaction and the activation energy is 45.5 kJ/mol. The second stage(30 min later) is the process of transformation from chemical reaction control to diffusion control or mixing control.

关 键 词：石煤钒矿 强化浸出 动力学 

分 类 号：TF841.3[冶金工程—有色金属冶金]