利用磷酸二氢铝结合剂再造绿松石的矿物学研究

利用与绿松石化学成分相近的无机结合剂Al（H2PO4）3溶液及相关辅助材料,通过压制再造的方法对小颗粒绿松石废弃料进行了改善处理,提高了绿松石废弃料的品质,使其宝石学特征、工艺和力学性质得到了明显改善。为了研究压制再造绿松石的结构和Al（H2PO4）3结合剂对其的改善机理,采用环境扫描电子显微镜、红外吸收光谱、X射线粉末衍射和单矿物化学成分分析等方法对处理前、后绿松石样品的宝石学特征及结构物相等特征进行了测试与分析。结果显示,处理后的绿松石样品中P2O5和MgO的质量分数均有不同程度的升高,其它的主要化学成分则变化不大;Al（H2PO4）3结合剂呈凝胶状分布于绿松石微孔隙间,部分绿松石样品微晶可能发生了微弱的溶解重结晶反应;处理后绿松石样品的矿物组构和分子结构与处理前的一致。由于添加了Al（HPO）结合剂,促进了绿松石微晶面网（120）的发育。

Mineralogical Study of Turquoise Reconstructed with Aluminum Phosphate Adhesive

The small particles of the wasted turquoises improved to a larger monomer scale and a higher quality jewelry grade by the way of pressing reconstruction are treated with the Al（H2PO4）3 adhesive whose chemical compositions are similar to that of turquoise.In order to study the structure of this kind of modified turquoises and discuss the mechanism of the turquoises improved by the Al（H2PO4）3 adhesive,the gemmological characteristics and the structural characteristics of this kind of turquoise samples before and after the treatment are tested and analysed by using the environmental scanning electron microscope,infrared spectrum,X-ray powder diffraction and chemical composition analysis.The results show that the micro-pores of the turquoise samples after the treatment are filled by Al（H2PO4）3 adhesive as gelatinous,and some microcrystals are dissolved with weak recrystallization reaction.The mineral components and molecular structure of the turquoise samples have no noticeable change,but the growth of the microcrystal net plane（120） of turquoise is promoted by the addition of Al（H2PO4）3 adhesive.