异极矿的水热改色及其谱学变化特征研究

Research on the Hydrothermal Treatment and Spectroscopic Characteristics of Hemimorphite

异极矿因其纯正漂亮的天蓝色在珠宝市场上受到消费者的青睐,然而市场上销售的异极矿大多颜色较浅,品质不高。结合目前异极矿的研究现状,对颜色较浅的异极矿进行了水热改色试验研究,通过优化溶液配比、实验温度、处理时间等参数获得了蓝色系列的异极矿样品,并对处理前后的异极矿样品进行X射线荧光光谱和紫外可见吸收光谱测试,以阐明异极矿在水热处理过程中的颜色变化机制。研究结果表明,水热法处理过程中异极矿样品中含有的Zn^(2+)离子与水溶液中的Cu^(2+)离子发生了离子交换,导致异极矿样品中的Cu^(2+)离子浓度增加,Zn^(2+)离子浓度降低,Cu^(2+)离子在红光区产生了较大的吸收峰,使得异极矿样品的蓝色调得到增强,从而达到了颜色改善的目的。异极矿的地球储量较大,文章提出的水热改色方案可以应用于颜色较差的异极矿样品,从而提升其作为矿标或观赏石的价值。

Hemimorphite,known for its pure and beautiful sky-blue color,enjoys favor among consumers in the jewelry market.However,a majority of hemimorphite available for sale in the market exhibits a lighter color and lacks high quality.Considering the current research status of hemimorphite,this study conducted hydrothermal diffusion treatment experiments on lightly colored hemimorphite.By optimizing parameters such as solution ratio,experimental temperature,and treatment duration,blue-colored hemimorphite specimens were obtained.The study subjected both pre-treated and post-treated hemimorphite experimental samples to X-ray fluorescence spectroscopy and UV-Visible absorption spectroscopy to elucidate the color change mechanism during the hydrothermal treatment of hemimorphite.The results of the research indicate that during the hydrothermal treatment process,an ion exchange occurred between the Zn^(2+)ions in the hemimorphite samples and the Cu^(2+)ions in the aqueous solution.This exchange resulted in an increase in the concentration of Cu^(2+)ions within the hemimorphite samples,accompanied by a decrease in the concentration of Zn^(2+)ions.The Cu^(2+)ions generated a prominent absorption peak in the red-light region,enhancing the blue hue of the hemimorphite samples and thereby achieving the objective of color improvement.Given the significant global reserves of hemimorphite,the hydrothermal color enhancement scheme proposed in this study can be applied to poorly colored hemimorphite specimens,thereby elevating their value as mineral specimens or appreciation stones.