Dry cement composition
AssigneeAktieselskabet Aalborg Portland-Cement-Fabrik
InventorPoul L. Rasmussen
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Abstract
A dry cement composition containing an amount of ferrous sulphate (FS) for eliminating or substantially reducing the content of water-soluble chromate, is produced by grinding a starting material (C, G) in a cement mill, and the ground cement material is passed from the mill to a storage container (33) The ferrous sulphate in an amount of 0.01-10 and preferably 0.4 percent by weight is added to and mixed with the starting material in a dry or non-dissolved condition at a location or at locations upstreams of the storage container (33). The ferrous sulphate is preferably added to the starting material upstream of the cement mill.
Claims9
A dry cement composition packed for shipment to the final user and comprising water-soluble chromate in an amount injurious to health, and dry, particulate commercial ferrous sulfate in an amount of 0.01-10 percent by weight and sufficient to substantially chemically reduce the water-soluble chromate when water is added to and mixed with the composition.
A dry cement composition packed for shipment to the final user and comprising water-soluble chromate in an amount injurious to health to which a dry, particulate commercial ferrous sulfate has been added in an amount of 0.01-10 percent by weight to substantially chemically reduce the water-soluble chromate when water is added to and mixed with the composition.
Dependencies are inferred from the claim text.