... : Qingdao Central Chemical Co., Ltd. locates in Qingdao,the beautiful seaside city ,which engages in the manufacturing and marketing of Sodium sulfate , Cryolite ... , Soda ash , Edible alkali, Polyaluminium Chloride, Polyacrylamide, Polyaluminium Ferric Chloride ,Polymerization iron sulfate , potassium sulfateand Sodium Tripolyphosphate ...