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METHOD FOR THE REDUCTION OF THE SOLUBLE CHROMATE CONCENTRATION IN CEMENT, AND PREPARATION COMPRISING CEMENT AND WATER-SOLUBLE METAL SULFATES
METHOD FOR THE REDUCTION OF THE SOLUBLE CHROMATE CONCENTRATION IN CEMENT, AND PREPARATION COMPRISING CEMENT AND WATER-SOLUBLE METAL SULFATES
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机译:降低水泥中可溶性铬酸盐浓度的方法,以及由水泥和水溶性金属硫化物组成的制备方法
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摘要
The aim of the invention is to create an iron (II) sulfate-containing reducing agent which is to be used especially for reducing the chromate concentration in cement as well as a suitable method for producing said reducing agent. Said aim is achieved by a method for producing an iron(II) sulfate-containing reducing agent, according to which iron(II) sulfate-containing salts are crystallized from an iron(II) sulfate-containing sulfuric acid, and the obtained suspension (thick sludge) that comprises the iron(II) sulfate-containing salts and the sulfuric acid is reacted directly with iron and/or one or several iron compounds so as to obtain the iron(II) sulfate-containing reducing agent without separating the sulfuric acid from the iron(II) sulfate-containing salts.
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