The Influence of Different Iron-Sulfur Ratios on Pyrite Formation under Thermal Sulfurization Condition
详细信息
- 责任者：Gao Wenyuan (College of Resources and Civil Engineering ; Northeastern University ; Shenyang 110819 ; China) ; Huang Fei
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(3)
- 关键词：黄铁矿 ; pyrite ; 结晶作用 ; crystallization
- 页码：p.131-137
- 图表：illus., 3 tables, 19 refs.
- 分类号：0700
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
In the course of simulating the volcanic exhalation mineralization,the impact of different iron-sulfur ratio from Fe∶S=1∶1 to 1∶8 on pyrite formation was investigated under the thermal sulfurization condition.By using scanning electron microscopy(SEM),powder X-ray diffraction(XRD) and other methods,the morphological,compositional and structural characteristics of the experimental products were observed and analyzed.With the Fe∶S ratio decreasing,the pyrite gradually increased and the pyrrhotite gradually reduced.The iron-sulfur ratio also had a certain impact on the crystal morphology of experimental products.After calculating,the pyrite grain size ranged from 42.543 nm to 63.799 nm,the pyrrhotite grain size ranged from 21.973 nm to 87.926 nm,and the unit cell volume of the pyrite and pyrrhotite changed a little.Combined with the thermodynamic analysis,under the thermal sulfurization condition,when the Fe∶S ratio was less than or equal to the iron-sulfur atomic ratio of pyrrhotite,the reaction produced pyrrhotite;when the Fe∶S ratio reached the iron-sulfur atomic ratio of pyrite,the pyrite appeared;when the Fe∶S ratio reached or exceeded the iron-sulfur atomic ratio of pyrite,the reaction mainly produced pyrite.The excessive sulfur condition was conducive to pyrite formation.The more adequate of sulfur source,the more percentage of pyrite would produce in the products.
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