September 23, 2011   Demand for sulphate additives weak in China   An eFeedLink Exclusive     Prices were mixed.   Transacted prices of sulphate feed additives in China Variety Price as of Sep 3 (RMB/tonne) Price as of Sep 21 (RMB/tonne) Price change (RMB/tonne) Cupric sulphate 16,100-16,300 15,800-16,300 -300 to 0 Fer ...