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| 闪锌矿内Fe、Cd、Zn之间的替换关系及其影响因素 |
| Replacement Relationship Between Fe, Cd and Zn in Sphalerite and Its Influencing Factors |
| 投稿时间：2018-12-17 修订日期：2019-01-10 |
| DOI： |
| 中文关键词: 闪锌矿,类质同象替换,相关性,丁家山铅锌矿,福建梅仙 |
| 英文关键词: Sphalerite, Isomorphic substitution, Correlation,Dingjiashan lead-zinc mine, Meixian Fujian province |
| 基金项目:湖南省自然科学(2017JJ3071),湖南省教育厅项目(17C0633)。 |
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| 中文摘要: |
| 闪锌矿中类质同象替换十分常见,一般认为Fe、Cd等元素都是替换Zn,但是大量研究数据显示,Cd、Fe之间的负相关关系比Cd、Zn之间更为普遍。本文以福建梅仙丁家山铅锌矿内两类矿石为对象,通过电子探针对闪锌矿内Zn、Fe、Cd之间的含量特征及相关性进行了深入分析。研究发现, Fe含量较低(0.714%-2.763%)的磁铁矿型矿石内,Cd、Fe之间的负相关非常显著(RFe-Cd=-0.700**),而Cd、Zn之间负相关不明显(RZn-Cd=-0.313)； Fe含量较高(8.507%-10.215%)的磁黄铁矿型矿石内,Cd、Fe之间和Cd、Zn之间均没有明显的相关性。由此可见,Cd替换Fe的强度明显强于替换Zn的强度,而且Cd对Fe的替换并不是简单的线性关系。究其原因,相比于Zn2+,Cd2+在电负性、晶格能、电离势等方面与Fe2+更加接近,所以在闪锌矿内,Cd更加趋向于替代Fe；高温条件更有利于Fe对Zn的替换,而降温过程则会使四次配位的Fe2+以六次配位的FeS形式出溶,从而为Cd替换Fe提供条件。 |
| 英文摘要: |
| Isomorphic substitution in sphalerite is very common. It is generally believed that Fe and Cd all replaced Zn, but a large number of research data show that the negative correlation between Cd and Fe was more common than Cd and Zn. There were two types of ore in Dingjiashan lead-zinc mine in Fujian province. In this paper,the content of Zn, Fe and Cd in sphaleritethe in two type ore were tested by electron probe,and correlations between Zn, Fe and Cd were analyzed. It is found that in magnetite-typeSore with low Fe content(0.714%-2.763%), negative correlation between Cd and Fe was very obvious(RFe-Cd=-0.700**), but there was no obvious negative correlation between Cd and Zn(RZn-Cd=-0.313). In pyrrhotit-typeSore with high Fe content(8.507%-10.215%), correlation between Cd and Fe, Cd and Zn were all not obvious. So, the strength of Cd replacing Fe is stronger than that of replacing Zn, and the replacement of Cd to Fe is not a simple linear. Compared with Zn2+, Cd2+ is closer to Fe2+ in terms of electronegativity, lattice energy, and ionization potential. So, Cd tends to replace Fe but not Zn in sphalerite. High temperature is more favorable to the substitution of Fe to Zn, and the cooling process will cause the four coordinated Fe2+ to be dissolved in the six-coordinated FeS form, thereby providing conditions for Cd to replace Fe. |
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