Abstract: A method and apparatus for automatically measuring the grain fineness, the gypsum content and the limestone content of a cement sample.A first fraction of the sample is loaded by a vibrating hopper into a crucible resting on an automatic scale. This crucible is handled sequentially by tongs on two revolving arms carried on slidable vertical shafts. The circular paths of the arms intersect at a point just above the scale. Motions of the arms and of the tongs are controlled by a programming unit. The weighed sample is poured into a sieve and the weight of oversize grains is automatically related to the sample weight.Gypsum is measured by heating a second fraction of the sample at 1000.degree. C. plus in an oxygen stream, Fe powder being added from a fixed hopper. The crucible is raised into an induction furnace. Released SO.sub.2 is bubbled in a titration cell to which potassium iodate is gradually added by a burette giving an automatic read-out of the SO.sub.3 (gypsum) titration.
Abstract: The hot air generator according to the present invention comprises a vertical cylindrical enclosure whose walls are covered on the inside with refractory brick, the heating burner being placed at the top of the enclosure and the hot air exhaust orifice being situated at the base thereof, and in which the source of air by which it is fed is divided into three distinct flows: a first flow constituting the combustion air from the burner; a second flow constituting a first current of dilution air cylindrically surrounding the flame; a third flow constituting a second current of dilution air insufflated at the base of the enclosure so that the enclosure comprises three temperature zones: a first temperature zone which is that of the flame and is on the order of 1,800.degree.; a second temperature zone downstream of the flame and on the order of 900.degree.; a third temperature zone which is that of the second dilution current mixes with the flux of hot air which is comprised between 850.degree. and 300.degree..
July 10, 1985
Date of Patent:
December 2, 1986
Societe des Ciments Francais
Raymond M. Saint Julian, Philippe M. Gehant, Ivan G. Bertrand, Michel H. Folliet
Abstract: A device is disclosed for continuously making samples to be analyzed by known instruments such as an X-ray spectrometer. The device consists of means for depositing a crude composition and associated vitrifying agent together in a crucible in accordance with a predetermined ratio by weight. The crucible is heated to melt its contents into an homogenous liquid mixture which is cooled to form a solid beadlet to be analyzed. The beadlet is conveyed to the analyzing instrument. A computer measures the respective weights of the components of the crucible contained composition and non-conforming weight measurements result in the crucible being discarded and replaced by another.