The usage of ferrous sulphate monohydrate in cement to reduce the hexavalent chromium content. Why ferrous sulfate monohydrate can reduce the hexavalent chromium content? The reasons are as follows:
1.Ferrous sulfate is widely used in cement industry as a reducing agent, and have very good effects.
2. The cost of other agent like Stannous chloride and Stannous sulfate are too high to be used on a large scale (Stannous chloride: USD 8000/MT, and Stannous sulfate: USD 9500-12700/MT). Ferrous sulfate is a common and cheap chemical which only cost USD80-160/MT, non-toxic with very stable chemical property.
3.What’s more, adding industry grade ferrous sulfate into cement will not affect the product property such as bending strength, compressive strength and water solubility etc.Ferrous sulphate monohydrate granular and powder can be mixed into cement when producing, ferrous sulfate granular can be put into clinker to be grinded together, and ferrous sulphate monohydrate powder can be mixed with finished cement to be used to reduce the content of water soluble hexavalent chromium.