贵州英坪磷矿伴生元素碘赋存特征及富集规律

Occurrence characteristics and enrichment regularity of associated iodine element of Yingping phosphate deposit,Guizhou Province

英坪磷矿位于瓮福矿田高坪矿区英坪矿段内,区内成矿地质条件优越,磷矿资源高度富集;矿石中普遍赋存伴生元素碘,产于下震旦统陡山沱组顶部第四段(Pt 33 d 4)磷块岩(b矿层)之中,产出层位稳定。通过英坪磷矿伴生元素碘的赋存特征分析,认识碘在空间内沿走向、倾向、厚度方向上的变化规律及基本特性。通过碘的富集规律分析,初步认为:碘富集于非晶质、隐晶质的胶磷矿中,该矿物的形成与藻类生物活动密切相关;不同的沉积环境影响着磷块岩的形成类型以及藻类生物作用的强度,从而制约着磷块岩中碘的聚集、浓缩和富集。磷化工企业可以通过先进的工艺将磷矿石中伴生元素碘进行回收,不仅能创造丰厚的经济效益,还能避免碘对环境的污染。

Yingping phosphate deposit is located in Yingping segment of Gaoping mining area,Wengfu ore field.The ore-forming geological condition is superior in the area and the phosphate resources are highly enriched.The associated iodine element is common in the ore,which is hosted at the top fourth section(Pt 33 d 4)phosphate rock(b ore layer)of the Doushantuo Formation of Lower Sinian system.The occurrence of rock layer is stable.Based on the analysis of occurrence characteristics of the accompanying iodine element in Yingping phosphate deposit,the variation regularity and basic characteristics of iodine in the space along the striking,dipping and thickness directions are understood.Through the analysis of iodine enrichment regularity,it is preliminarily believed that iodine is enriched in amorphous and cryptocrystalline collophanite.The formation of this mineral is closely related to biological activities of algae.Different sedimentary environments affect the formation type of phosphate rock and the biological action intensity of algae,which restricts the accumulation,concentration and enrichment of iodine in phosphate rock.Phosphorus chemical enterprises can recover the iodine associated with phosphate rock through advanced technology,which can not only create economic benefits,but also avoid iodine pollution to the environment.