November 4, 2011   China demand for sulphate additives stays slack   An eFeedLink Exclusive     Prices were mostly soft.   Transacted prices of sulphate feed additives in China Variety Prices as of Oct 20 (RMB/tonne) Prices as of Oct 31 (RMB/tonne) Price change (RMB/tonne) Cupric sulphate 15,500-16,000 16,100-1,6400 +6 ...