Abstract: The direct and indirect ammonia stripping processes to treat coal water were applied. The
quality of the ammonia wastewater after treatment is tested，and the conditions required for the two
processes are studied. The study reveals that the direct ammonia stripping process has a hydrolysis
effect on cyanides，effectively mitigating the corrosion of equipment by cyanides. Conversely，the
indirect ammonia stripping process is characterized by its low wastewater generation. Therefore，the
selection of the ammonia stripping process should be determined according to specific conditions in the
gas purification process.

Key words: Ammonia stripping process, Equipment corrosion degree, Cyanide hy drolysis