软锰矿在辉钼矿焙烧过程中的固硫作用
来源期刊：中南大学学报(自然科学版)2005年第6期
论文作者：符剑刚 钟宏 吴江丽 张小军
文章页码：994 - 1000
关键词：辉钼矿;焙烧;软锰矿;固硫;溶剂萃取
Key words：molybdenite; roas;t pyrolusite; sulfur retained; solvent extract
摘 要：为克服辉钼矿传统焙烧-氨浸工艺中含硫烟气对环境的严重污染,提出联产钼酸铵和硫酸锰的软锰矿与辉钼矿共同焙烧新工艺,并从热力学角度和通过热重分析等手段在理论上论证该新工艺的可行性。根据焙烧产物的性质,设计了软锰矿和辉钼矿共同焙烧新工艺的工艺流程,采用分段升温焙烧,研究了辉钼矿与软锰矿的物料配比对固硫率的影响。研究结果表明:加入软锰矿可以显著降低辉钼矿的焙烧温度,在450~550℃时, MoS2的分解率可达100%,产物以MnMoO4为主;焙烧过程中的固硫率随着MnO2含量增加而升高,固硫效果非常明显,当 n(MnO2)∶n(MoS2)=9时,固硫率接近98%。
Abstract: In order to avoid pollutantSO2in the traditional process of roasting and ammonia-leaching for molybdenite, the new process of molybdenite and pyrolusite co-roasting, in which (NH4)2MoO4 and MnSO4 could be obtained at the same time, was put forward, and its practicability was demonstrated theoretically through thermodynamics analysis and thermogravimetry. According to the properties of products,principle technological flow of the new process ofmolybdenite and pyrolusite co-roasting was designed. The effects ofmaterial ratio betweenMoS2andMnO2on sulfur-retained ratiowere investigated under the condition of temperature-gradientmethod roasting. The results show that the roasting temperature can be decreased observably after the addition of pyrolusite, and dissolution ratio ofMoS2can reach 100% at 450~550℃, and thatMnMoO4is themajor produc.t The effectof sulfur-retained is very eviden,t furthermore, the sulfur-retained ratio increaseswith the dosage ofMnO2. Whenn(MnO2)∶n(MoS2) is9,the sulfur-retained ratio reaches about98%.
