硫铁矿焙烧及反应过程的初步研究  

Preliminary Study on Roasting and Reaction Process of Pyrite

作　　者：徐建林[1] 李元坤[1] 史光大[1] 罗宇智[1] 余平[1] 钟庆文[1] 

机构地区：[1]中国地质科学院矿产综合利用研究所,四川成都610041

出　　处：《矿产综合利用》2012年第3期46-48,共3页Multipurpose Utilization of Mineral Resources

基　　金：国土资源地质大调查项目(1212010816037)

摘　　要：在800℃下对含硫量50%的硫铁矿进行了沸腾焙烧,产出的硫铁矿烧渣硫含量低于0.30%,全铁含量大于64%。硫铁矿烧渣的主要矿物组成为赤铁矿、磁铁矿、磁赤铁矿。硫铁矿在焙烧过程中首先发生分解,在颗粒的表面上生成氧化产物或中间产物,体积膨胀,粒径增大,产生许多细微的裂纹,在氧气的亲和力和SO2向外逃逸产生的牵引力的作用下,使硫铁矿烧渣产生空洞。当反应温度升高,反应急剧进行,硫铁矿颗粒会发生爆炸反应,最终形成以Fe2O3为壳的小球形烧渣;或者形成以Fe3O4为基体,Fe2O3为包壳,Fe2O3柱状晶钉扎在Fe3O4基体上的实心硫铁矿烧渣。The experiment on the pyrite concentrate containing 50% （wt） sulfur at 800℃ in fluidized-bed roaster was described in the paper. The content of sulfur was under 0. 30% （wt） and the total iron was over 64% in the cinder of pyrite, the main minerals of which were hematite, magnetite and maghemite. The pyrite was first decom- posed in the process of roasting, producing oxidized or intermediate products on the surface of the pyrites particles with volume expanded, grain diameter increased and many microcracks produced. Under the affinity of the oxygen and traction effect generated by the escaped sulfur dioxide many cavities were produced in the cinder of pyrite. Ex- plosive reactions of the pyrites particles happened at high temperature and rapid reaction rate so that little spherical cinders taking Fe2O3 as shell were produced or solid pyrite cinders with Fe2O3 shell and Fe3O4 substrate which was pinned by some Fe2 O3 columnar crystals were produced.

关 键 词：硫铁矿 焙烧 反应过程 微观结构 

分 类 号：TQ03[化学工程]