CAJ | 학술논문

研究品位为39.27%的低品位钼精矿的氧化焙烧热力学、物相演变规律及焙烧特征。热力学分析表明：MoS 2氧化的趋势仅次于FeS 2氧化趋势，能生成多种价态的氧化物，且生成的MoO 3可与多种金属氧化物反应生成钼酸盐，其中生成钼酸钙的趋势最大。焙烧过程包括MoS 2氧化不充分、MoO 3稳定存在和钼酸盐生成3个阶段，温度过高或时间过长易生成不利于后续钼溶出的钼酸盐和低价氧化钼，适宜的焙烧温度为650~675℃、焙烧时间为2 h左右。氧化焙烧后，氨浸的钼溶出率仅为84.02%，浸出渣中钼含量高达13.93%，XRD分析表明浸出渣的组成以钼酸钙为主。采用Na 2 CO 3为浸出剂对氨浸渣进行二次浸出，可将氨浸渣中的钼酸钙溶出，最终钼的总回收率可达90.82%。
연구품위위39.27%적저품위목정광적양화배소열역학、물상연변규률급배소특정。열역학분석표명：MoS 2양화적추세부차우FeS 2양화추세，능생성다충개태적양화물，차생성적MoO 3가여다충금속양화물반응생성목산염，기중생성목산개적추세최대。배소과정포괄MoS 2양화불충분、MoO 3은정존재화목산염생성3개계단，온도과고혹시간과장역생성불리우후속목용출적목산염화저개양화목，괄의적배소온도위650~675℃、배소시간위2 h좌우。양화배소후，안침적목용출솔부위84.02%，침출사중목함량고체13.93%，XRD분석표명침출사적조성이목산개위주。채용Na 2 CO 3위침출제대안침사진행이차침출，가장안침사중적목산개용출，최종목적총회수솔가체90.82%。
Thermodynamics of oxidation roasting, phase evolution rules and roasting characteristics of low grade molybdenum concentrate with grade of 39.27% were studied. Thermodynamics analyses show that the oxidation tendency of MoS 2 is second to that of FeS 2 , so it is easily oxidized and generates several oxide products. Furthermore, MoO 3 could react with various metal oxides to generate molybdate in which calcium molybdate generates most easily. Roasting process contains three stages of incomplete oxidization of MoS 2 , stable existence of MoO 3 and generation of molybdate. Molybdate and low valence molybdenum oxide, which go against subsequent leaching, will easily generate at over high temperature or for long time. The suitable temperature is 650?675 ℃ and the roasting time is 2 h. After roasting, ammonia leaching rate of molybdenum is only about 84.02%, residue of Mo in leaching residue reaches 13.93%. XRD analysis shows that calcium molybdate is the main component in leaching residue. When Na2CO3 is used as the leaching reagent, calcium molybdate can be extracted during leaching residue, and the ultimate recovery rate of Mo can reach 90.82%.