Activated carbon as an adsorbent or an adsorbent made of kaolin, the purification method for treating mercury-containing waste water, said adsorbing mercury removal method. For example, if a domestic factory treats mercury-containing sewage, the process adopts static adsorption method (precipitation, post-adsorption). Sodium sulfide as precipitant agent, i.e., so that mercury ions precipitate mercury sulfide, calcium hydroxide while a pH adjusting agent to ferrous sulfate as a coagulant in sewage removing silt and other suspended impurities, activated carbon adsorption and leakage metallic mercury and mercury compounds. The treated discharged water can reach the discharge standard. The process flow is shown in the figure below. As a professional manufacturer for punch pin with more than 10 years experience.We have been supplied the DIN 9861D standard punch,connical head punch,,blade shape punch,shoulder punch with conical head,Hss punch pin,SKD11 Punch pin,SUJ2 punch to top brand die press tool company in the world.And we enjoyed good reputation from all of them. Din 9861 Series Punch,Precision Din 9861B Punch,Precision Modified Din 9861C Punch,Din 9861 Standard Punch Changsha Borun Mould Co. Ltd. , http://www.borunmouldparts.com