山东省蒙阴县蒙山北部麦饭石地球化学、溶出与吸附特征

Geochemical,Dissolution and Adsorption Characteristics of Maifanite in Northern Mengshan,Mengyin County,Shandong Province

山东省蒙阴县蒙山北部地区麦饭石矿产资源品质好,且矿石开发利用已具有较大规模。为查明该区麦饭石全岩地球化学及麦饭石溶出和吸附特征,本文对研究区麦饭石岩相学和地质地球化学特征进行了分析研究。研究结果表明,蒙阴县蒙山北部地区麦饭石属钙碱性岩浆岩,其对人体的有益和有害元素的含量与地壳元素丰度值相当或略低。麦饭石的溶出和吸附特征表明,麦饭石能溶出有用组分偏硅酸(H_(2)SiO_(3)),并且含量均达到了天然饮用矿泉水的标准要求(≥25.00 mg/L),有益有害元素也均满足限量指标要求,溶出效果较好。麦饭石对有害元素Pb、Cd、Hg、As、Cr均具有较强的吸附作用,其中对Cd、Hg、Pb等元素吸附效果最好。本次研究为制定山东省麦饭石矿产地质勘查地方标准及开发利用提供科学依据。

The mineral resources of maifanites in the northern part of Mengshan,Mengyin County,Shandong Province are of good quality,and the development and utilization of the ores has already reached a large scale.This work analyzed and studied the petrographic and geological geochemical characteristics of maifanites in the study region to determine the whole rock geochemistry,dissolution and adsorption characteristics of maifanites.The results show that the maifanites in the northern part of Mengshan,Mengyin County are a calc-alkaline magmatic rock.The content of beneficial and harmful elements to the human body is equivalent to or slightly lower than the abundance of crustal elements.The dissolution and adsorption characteristics of maifanites demonstrate that the beneficial component metasilicic acid(H_(2)SiO_(3))may be dissolved by maifanites,and the concentration reached the standard requirements of natural drinking mineral water(≥25.00 mg/L).Both the beneficial and harmful elements meet the limit index requirements,and the dissolution effect is better.Maifanites have a substantial adsorption effect on harmful elements Pb,Cd,Hg,As and Cr,among which Cd,Hg and Pb have the best adsorption effect.This study provides a scientific foundation for the formulation of local standards and development and utilization of maifanites mineral geological exploration in Shandong Province.