四川荣县紫砂矿物资源的发现及其矿物岩石学特征

Discovery of Zisha Mineral Resources in Rong County, Sichuan Province, China and its Mineralogy and Petrology Characteristics

为了寻找新的紫砂矿物资源,为荣县陶土的高附加值利用以及紫砂矿物原料研究与应用提供科学依据,采用多种现代岩矿测试分析技术,对比研究了四川荣县陶土与宜兴紫砂泥料的矿物岩石学特征,结果表明：荣县陶土的化学成分平均含量是,w（Si O2）64.29%,w（Al2O3）22.72%,w（Fe2O3）6.51%,w（K2O）3.81%,四者之和达97.33%,而有害成分CaO含量低,w（Ca O）0.35%;矿物成分石英35%～40%,高岭石25%～30%,伊利石30%～35%,赤铁矿3%～5%;结构构造主要为块状构造,粉砂泥质结构,石英分布均匀,颗粒大小为10～250μm;热效应特征是,平均热失重为4.99%,脱羟温度515℃左右。荣县陶土这些矿物岩石学特征都与宜兴紫砂矿物原料中的紫泥相同或相似,有可能作为一种优质的紫砂矿物资源。另外,荣县陶土中的淡绿色部分和紫红色部分分别与宜兴绿泥和朱泥有相似之处。

In order to search for new Zisha mineral resources and to provide scientific reference for the research and application of Zisha mineral materials, we used various modern ore determination analysis techniques to get comprehensive results. By comparing different mineralogy and petrology features between pot clay from Rong County and clay from Yixing Zisha, we concluded that pot clay from Rong County is composed of Si O2（64.29 %）, Al2O3（22.72%）, Fe2O3（6.51%）, and K2O（3.81%）; sum of above is 97.33% and the harmful composition Ca O content is 0.35% only. Mineral compositions of quartz, kaolinite, illite and hemalilte are 35%-40%, 25%-30%, 30%-35%, and 3%-5%, respectively. Pot clay from Rong County is mainly massive structured and silty argillaceous structured. The quartz component is evenly distributed with a granularity index of 10-250 μm. Its thermal weight loss is 4.99% on average and takes off the hydroxyl at temperature about 515 ℃. With all the similarities on mineralogy and petrology feature straits of Zisha clay from Yixing area, we are able to identity Rong County pot clay as a good Zisha mineral resources. In addition, the prunosus and light green components in pot clay from Rong County are similar with the red and green clay from Yixing area, respectively.