河南宜阳、南召钾长石矿石特征与铁的赋存状态研究

Ore Characteristics and Fe Occurrence of Yiyang and Nanzhao Area,Henan Province,China

对河南宜阳、南召两地区的伟晶岩型钾长石矿石的化学成分、矿物组成、微区化学成分等进行分析,系统地研究了河南宜阳、南召地区钾长石矿石特征与铁的赋存状态。研究表明,两地区伟晶岩矿中氧化钾含量均在7%以上,氧化铁含量在1%以下,南召地区伟晶岩型钾长石矿石品位明显好于宜阳地区。两地区矿石中铁元素的赋存状态主要有2种形式:一类是以氧化物形式赋存于褐铁矿中;一类是以类质同象方式存在于矿物中,代替晶格中的其他阳离子,主要赋存于白云母、黑云母中,少量存在于钾长石、钠长石、金红石和钙质胶结物中。

In this study,chemical and mineral compositions of pegmatite-type potash feldspar from Yiyang and Nanzhao area,Henan Province,China were analyzed systematically for their characteristics and Fe occurrence.The results show that K2O content of pegmatite in two areas is higher than 7%,and the content of iron oxide is lower than 1%.The ore grade of Nanzhao area is obviously higher than that of Yiyang area.Fe existing in pegmatite from two areas has two forms as oxide type in limonite and isomorphism type substituting other cations in minerals.Fe mainly exists in muscovite and biotite with a little existing in potash feldspar,albite,rutile and calcareous cement.