Method for treating H2S tail gas in CVD-ZnS preparation process

• Main Authors: YANG WEISHENG, ZI GUANGPING, WU SHAOHUA, WANG KAN, ZHANG MING, HE YU, YING FEIFEI, JIANG JIE, LI MAOZHONG, CHEN JI, ZHU KAI, MU RUI
• Format: Patent
• Language: English
• Published: 25.02.2015
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY

The invention discloses a method for treating H2S tail gas in a CVD-ZnS preparation process. The method comprises the following steps: adjusting and controlling the pH value of an absorption liquid which is metallurgical industry wastewater containing harmful metal ions; blowing the H2S tail gas into the absorption liquid to lead a chemical reaction between the H2S gas and metal ions in the absorption liquid so as to generate sulfide precipitate; settling and filtering to obtain metal sulfide concentrate. According to the method, waste is treated by waste, so that the problem of high treatment cost due to the fact that massive alkali is needed to be consumed for treating H2S tail gas by the prior art can be effectively reduced, valuable metal ions in the metallurgical industry wastewater can be effectively reclaimed, valuable metal resources can be circularly and comprehensively utilized, and environment protection is benefited.