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US 4,049,435 AGranted
Method for obtaining a lump product
OwnerValery Efimovich Lotosh, Vladimir Demyanovich Steblyakinventors
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OwnerValery Efimovich Lotosh, Vladimir Demyanovich Steblyakinventors
Estimating the term…
The proposed method relates to preparation of ores and is intended for production of pellets and briquettes with use being made of mineral hydraulic binders. This method comprises mixing an ore with a mineral hydraulic binder, the mixture obtained is simultaneously homogenized and activated, then said mixture is pelletized and the green lumps are subjected to a heat humidity treatment at 70-100% relative humidity and a temperature of 60.degree.-250.degree. C followed by a two-stage heat treatment, the first stage of said treatment being effected at 70.degree.-100.degree. C until there is a 2-5% content of free moisture in the lumps, and the second stage of heat treatment being effected at a temperature of no less than 100.degree. C and no more than 900.degree. C until there is 0.01-1.0% content of free moisture in the lumps.
A method for preparing a strengthened pelleted ore product, which comprises an ore of C. than 1 mm in size with a hydraulic binder, simultaneously homogenizing and activating the mixture, pelleting the mixture to obtain green pellets, steaming the green pellets at a temperature of 60.degree.-250.degree. C. and a relative humidity of 70-100%, heat treating the pellets at a first temperature of 70.degree.-100.degree. C until the free moisture content of the pellets is 2-5%, and adjusting to a second heat treatment temperature of from at least 100.degree. to 900.degree. C. until the free moisture content of the pellets is 0.01 to 1.0% thereby obtaining a strengthened ore pellet product.
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