软锰矿与硫化铋矿交互焙烧过程的热力学分析  

Thermodynamic analysis of interactive roasting process of bismuth sulfide ore and pyrolusite

作　　者：张传福[1] 夏楚平[1] 王志坚[1] 湛菁[1] 邬建辉[1] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第10期3984-3990,共7页Journal of Central South University:Science and Technology

基　　金：湖南省科学技术厅科技计划重点项目(2010SK2010);国家高技术研究发展计划("863"计划)项目(2011AA061002)

摘　　要：提出利用软锰矿与低品位硫化铋矿交互焙烧反应可同时进行氧化锰的硫酸化焙烧和硫化铋的氧化焙烧2个焙烧过程从而实现二氧化硫的零排放的新工艺。首先从热力学角度并通过热重分析等手段在理论上论证新工艺的可行性。然后进行焙烧试验,研究物料配比n(MnO2)/n(S)对硫转化率及固硫率的影响。研究结果表明:软锰矿在交互焙烧过程中氧化锰转化成硫酸锰的固硫率非常高。当固定焙烧温度为923 K、焙烧时间为2 h和n(MnO2)/n(S)≥1.6时,固硫率大于99%,其硫转化率高达94%。原矿中铋在焙烧产物中主要以Bi2O3和Bi28O32(SO4)10形态存在,其他硫化物物相消失,表明在交互焙烧过程中硫化铋充分转化成氧化物。The new method of interactive roasting with bismuth sulfide ore and pyrolusite was put forward, which consists of two simultaneous processes： sulphating roasting of manganese oxide and oxidizing roasting of bismuth sulfide to achieve zero emissions of sulfur dioxide. Firstly the feasibility was demonstrated theoretically through thermodynamics analysis and thermogravimetry. Then roasting experiments were carried out, and then effect of the material ratio n（MnO2）/n（S） on sulfur conversion ratio and sulfur-retained ratio was studied. The result shows that sulfur-retained ratio of pyrolusite by process of manganese oxide into manganese sulfate is very high. When roasting temperature is 923 K, roasting time is 2 h, and n（MnO2）/n（S）≥1.6, the sulfur-retained ratio reaches about 99% or more, and the sulfur conversion rate reaches 94%. The bismuth in raw ore mainly converts into the form of Bi203 and Bi28O32（SO4）10, and other sulfide phases disappear, which shows that oxidizing roasting of sulfide is enough.

关 键 词：硫化铋矿 交互焙烧 软锰矿 固硫 

分 类 号：TF046.2[冶金工程—冶金物理化学]