摘要
膨润土的经济价值和应用价值源于其主矿物蒙脱石的含量及其独特的矿物学特性。通过对苏南地区8个主要矿区膨润土样品的p H、矿物组成、化学组成、颗粒分布、阳离子交换量及阳离子组成等性质进行分析,进而探讨该地区膨润土的主要矿物学特性。结果发现,8种苏南天然膨润土总体偏碱性,p H平均约为8.83。矿物组成均以蒙脱石为主,含有一定量的伴生矿物,且伴生矿物的种类和含量因样品而异。8种苏南膨润土样品的X射线衍射分析结果表明其均属于钙基膨润土,化学组成及阳离子组成等因矿床类型不同存在一定的差异,阳离子交换量与交换性阳离子量密切相关,阳离子交换量总体偏低。8种膨润土样品中蒙脱石含量和<50μm粒级存在显著正相关性(p<0.05)。通过对苏南地区天然膨润土样品物理化学和矿物学特性的分析,合理运用其特性,已成为开拓膨润土应用领域的关键。
【Objective】 Bentonite,as is widely used in industry and agriculture,has become an research hotspot in material science agricultural science and environmental science.Montmorillonite is the main mineral component of bentonite,and its content and unique mineralogical properties determine the economic and application values of bentonite.Bentonite ore is found widely distributed in Jiangsu Province.From the perspective of the current development and utilization of bentonite in China,the mineral is mined at a local small-scale to make low-level processing products.It is necessary to study how to further exploit the mineral resource.In this paper,based on the researches reported,the bentonites in South Jiangsu were chosen for analysis of their mineralogical properties,in an attempt to provide certain scientific basis for further development and reasonable utilization of the mineral.【Method】To comprehensively explore mineralogical properties of the mineral,bentonite samples were collected from eight major bentonite mines in South Jiangsu and analyzed for p H,mineral composition,chemical composition,particle size distribution,cation exchange capacity and cation composition.【Result】Results show that the natural bentonites in South Jiangsu tend to be high in p H,with an average being about 8.83 and are mainly composed of montmorillonite and a certain amount of associated minerals,which vary in type and content with origin of the samples.X-ray deflection analysis shows that the 8 samples are all calcium-based bentonites.Their chemical composition and cation composition varies somewhat in line with their metallogenic environments.Generally their CECs tend to be low.In the samples,CEC is found to be closely and positively related to the content of montmorillonite.All the findings in this study on physicochemical and mineralogical properties of the bentonite in South Jiangsu demonstrate that it has a good prospect in exploiting the resource.【Conclusion】The natural bentonites in South Jiangsu are all of the calc
作者
干方群
杭小帅
刘云
马毅杰
GAN Fangqun;HANG Xiaoshuai;LIU Yun;MA Yijie(College of Environment andEcology,Jiangsu Open University（The City Vocational College ofJiangsu）,Nanjing 210017 China;Nanjing Institute of Environmental Sciences,Ministry of Environmental Protection,Nanjing 210042,China;State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China)
出处
《土壤学报》
CAS
CSCD
北大核心
2018年第4期945-954,共10页
Acta Pedologica Sinica
基金
江苏开放大学‘十三五’规划课题(17SSW-Z-Z-020)
江苏省环境工程重点实验室开放课题(KF2015001)资助~~
关键词
化学组成
矿物特征
颗粒分布
膨润土
苏南
Chemical composition
Mineralogical properties
Particle size distribution
Bentonite
South Jiangsu
