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US 5,417,760 AGranted
Method for manufacturing of normal as well as ultra-fine cement
AssigneeF. L. Smidth & Co. A/S
InventorJan Folsberg
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AssigneeF. L. Smidth & Co. A/S
InventorJan Folsberg
Estimating the term…
A method is described for manufacturing of normal as well as ultra-fine cement on the basis of cement materials, such as cement clinker, gypsum, slag, limestone, pozzolana, flyash etc. in a plant comprising at least a mill (1), a classifying separator (3), a separation cyclone (5) and a dust collector (7). By this method some of the dust-laden conveying gas which is extracted via the cyclone gas outlet duct (11) is diverted to and dedusted in the dust collector (7), and the dust from the dust collector (7) is utilized as the basis for ultra-fine cement, whereas the cyclone material from the material outlet (9) of the cyclone is utilized as normal cement. Hence it is possible to manufacture ultra-fine cement in existing grinding plants in a mechanically simple and operationally inexpensive way, while normal cement is simultaneously manufactured, without having any significant impact on the mill operation.
A method for manufacturing simultaneously two types of cement, a first cement having a fineness in the range of 300-500 m.sup.2 /kg, and a second ultra-fine cement having a fineness of 600-1000 m.sup.2 /kg, on the basis of cement materials selected from at least one of the group consisting of cement clinker, gypsum, slag, limestone, pozzolana, flyash in a plant comprising at least a mill, a classifying separator, one or several separation cyclones and a dust collector, by which method the material is fed to and ground in the mill, and subsequently conveyed to the separator in which it is divided into a coarse fraction which is returned to the mill and a fine fraction which suspended in a conveying gas is conducted to the cyclone in which the material/gas suspension is separated into cyclone material which is discharged via the material outlet of the cyclone and into dust-laden conveying gas which is discharged via the gas outlet duct of the cyclone, and whereof a partial quantity of the dust-laden conveying gas is subsequently via a duct conducted to and dedusted in the dust collector, and extracting the dust from the dust collector and utilizing the dust as the basis for the second ultra-fine cement and utilizing the cyclone material as said first cement.
A method for the simultaneous manufacture of a fine ground product and coarse ground product from a pulverulent material in a plant comprising at least a mill, a classifying separator, one or several separation cyclones and a dust collector, by which method the material is fed to and ground in the mill, and subsequently conveyed to the separator in which it is divided into a coarse fraction which is returned to the mill and a fine fraction which suspended in a conveying gas is conducted to the cyclone in which the material/gas suspension is separated into a cyclone material which is discharged via the material outlet of the cyclone and into dust-laden conveying gas which is discharged via the gas outlet duct of the cyclone, and whereof a partial quantity is subsequently conducted via a further a duct to, and dedusted in, the dust collector, characterized in that the dust is extracted from the dust collector and utilized as a fine ground product and in that the cyclone material is utilized as a coarse ground product.
Dependencies are inferred from the claim text.