绿松石废弃料的压制再造工艺研究

选用Al（H2PO4）3溶液为胶粘剂，对小颗粒的绿松石废弃料进行了压制再造实验。实验结果表明，胶粘剂的添加质量、绿松石的粉体粒度、加压压力与时间、保温温度与时间对绿松石废弃料的压制再造效果均有不同程度的影响。实验效果最佳的工艺条件为：胶粘剂的质量与绿松石粉料的质量比例为1：4，绿松石粉体粒度不小于250目，加压压力为1．5×10^4～3．0×10^4MPa／m^2，在室温下自硬化1～2d后按照一定的恒温曲线进行加热固化。压制再造实验后绿松石坯体的颜色均匀、色调单一，多为浅蓝绿色；其表面维氏显微硬度为105～198N／mm^2，透明度、光泽、韧性和耐久性较好；其宝石学特征如光泽、折射率、紫外荧光等与天然绿松石的相近；加工工艺性能优良，可加工成首饰用绿松石珠链和戒面。

Study on Pressed Reconstruction Techniques of Wasted Turquoise

The small particles of wasted turquoise are pressed reconstruction with Al（H2PO4）3 adhesive solution. The results show that the weight of the adhesive, the size of the turquoise powder, the pressed pressure and time, the heat preservation temperature and time have the different effects on the pressed reconstraction experiments. The optimal process conditions are that the weight ratio between the adhesive and turquoise powder is 1 ： 4. The size of the particles is no less than 250 eyelet. The pressure is 1.5×10^4-3.05×10^4 MPa/m^2. Then after self-hardening at room temperature for 1-2 days, the turquoise body should be heated for solidify with a certain temperature curve. The colour of the turquoise body is uniform with light blue-green. The micro-hardness is 105- 198 N/mm^2. The gemmological characteristics of the turquoise body, such as luster, refractive index, UV fluorescence and so on, are similar with that of the natural turquoise. The turquoise after pressed reconstruction experiments could be manufactured for turquoise beads and ring stones.