Method for preparing orpiment crystals by hydrothermal method

• Main Authors: KE YONG, XU HUI, WANG JINGWEN, FU HAIKUO, LIANG YANJIE, WU LIJUE, MIN XIAOBO, XU QIUJING, CHAI LIYUAN, YAO LIWEI
• Format: Patent
• Language: Chinese; English
• Published: 05.06.2020
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY

The invention discloses a method for preparing orpiment crystal by a hydrothermal method, which comprises the following steps: by using amorphous As2S3 as a raw material, carrying out hydrothermal treatment at 180-270 DEG C for 6-48 hours to obtain the orpiment crystal. According to the invention, amorphous As2S3 is used as a raw material; by strictly controlling the temperature and time of hydro-thermal treatment, amorphous arsenic trisulfide is converted into stable orpiment crystals; by further optimizing the pH, solid-liquid ratio, temperature and time of hydro-thermal treatment, the orpiment crystals are good in crystal form, high in conversion rate and free of other impurities, and controllable synthesis of the orpiment crystals is achieved. 本发明公开了一种水热法制备雌黄晶体的方法，以非晶态三硫化二砷为原料，在温度为180℃～270℃的条件下，水热处理6h～48h得到雌黄晶体。本发明以非晶态三硫化二砷为原料，通过严格控制水热处理的温度和时间，将非晶态三硫化二砷转变为稳定的雌黄晶体，并通过进一步的优化水热处理的pH、固液比、温度和时间，能使得雌黄晶体晶型良好、转化率高、无其他杂质存在，实现了雌黄晶体的可控合成。