摘要
采用氧压分解—氨浸联合工艺处理国内某辉钼矿,使原矿中的钼以H_(2)MoO_(4)或MoO_(3)形式入渣,铼和硫分别转化成HReO_(4)和H_(2)SO_(4)进入浸出液,实现钼、铼和硫的综合回收。系统考察了试验温度、时间、液固比等工艺参数对钼转化率、硫氧化率及铼浸出率的影响。结果表明:在氧压分解温度195℃、氧分压0.6~0.7 MPa、搅拌转速335~383 r·min^(−1)、液固比4~6、反应时间6~7 h的条件下,钼转化率、硫氧化率和铼浸出率均超过98%。物相分析显示氧压渣主要含氧化钼及少量SiO_(2)、硅酸盐和未反应辉钼矿。氧压渣在60℃、液固比3.5~4∶1、pH值8.5~9.0条件下氨浸30 min,钼浸出率达98.8%以上,渣率15.5%,渣含钼3.5%~3.7%。氧压分解过程中,温度、反应时间和氧分压是影响钼转化率的主要因素,随着温度的升高、反应时间的延长及氧分压的增加,钼的转化率增加;研究可为辉钼矿的加压氧压分解与环保生产提供技术参考。
A combined process of oxygen pressure decomposition and ammonia leaching was employed to treat a domestic molybdenite concentrate.In this process,molybdenum in the raw ore was converted into H_(2)MoO_(4)or MoO_(3)and retained in the residue,while rhenium and sulfur were transformed into HReO_(4)and H_(2)SO_(4),respectively,entering the leaching solution,achieving comprehensive recovery of molybdenum,rhenium,and sulfur.The effects of key process parameters,including temperature,time,and liquid-to-solid ratio,on molybdenum conversion rate,sulfur oxidation rate,and rhenium leaching rate were systematically investigated.The results showed that under optimal conditions—oxygen pressure decomposition at 195℃,oxygen partial pressure of 0.6–0.7 MPa,stirring speed of 335–383 r·min^(−1),liquid-to-solid ratio of 4–6,and reaction time of 6–7 h—the conversion rate of molybdenum,oxidation rate of sulfur,and leaching rate of rhenium all exceeded 98%.Phase analysis revealed that the oxygen pressure residue mainly consisted of molybdenum oxide,along with minor amounts of SiO_(2),silicates,and unreacted molybdenite.Subsequent ammonia leaching of the residue at 60℃,a liquid-to-solid ratio of 3.5–4∶1,and pH 8.5–9.0 for 30 min achieved a molybdenum leaching rate of over 98.8%,with a residue yield of 15.5%and molybdenum content in the residue of 3.5%–3.7%.During oxygen pressure decomposition,temperature,reaction time,and oxygen partial pressure were identified as the main factors affecting molybdenum conversion efficiency,with higher conversion rates observed at increased temperature,extended reaction time,and elevated oxygen pressure.This study provides technical insights for pressurized oxygen decomposition and environmentally friendly production of molybdenite.
作者
孙彦文
陈佳佳
余群波
赵峰
邹小平
SUN Yanwen;CHEN Jiajia;YU Qunbo;ZHAO Feng;ZOU Xiaoping(BGRIMM Technology Group,Beijing 100160,China)
出处
《矿冶》
2025年第4期592-597,共6页
Mining And Metallurgy
基金
国家重点研发计划项目(2022YFC2904603)。
关键词
钼精矿
氧压分解
氨浸
钼
铼
molybdenum concentrate
oxygen pressure decomposition
ammonia leaching
molybdenum
rhenium
作者简介
第一作者:孙彦文,硕士,高级工程师,从事有色金属冶炼研究与设计工作。E-mail:maccosun@126.com;通信作者:陈佳佳,硕士,工程师,E-mail:chenjiajia@bgrimm.com。
