Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Sample mechanical transport means in or for automated...
Patent
1988-01-04
1989-07-18
Marcus, Michael S.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Sample mechanical transport means in or for automated...
141 83, 141103, 177 50, 177 52, 177 54, 177 55, 414 21, 414180, 414186, 422 64, 422 68, 422 75, 422 78, 422104, G01N 3500
Patent
active
048491756
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.
Limestone is also measured by heating a third fraction of the sample to release CO.sub.2, and measuring the weight increase of a column, filled with NaOH which absorbs the released CO.sub.2, which is placed on a second automatic scale. The column is automatically disconnected from the gas circuit before being weighed.
REFERENCES:
patent: 3870465 (1975-03-01), Marechal
patent: 4113436 (1978-09-01), Werder et al.
patent: 4391774 (1983-07-01), Dupain
patent: 4562044 (1985-12-01), Bohl
patent: 4595562 (1986-06-01), Liston et al.
Dupain Jean R.
Vernet Christian P.
Marcus Michael S.
Santiago Amalia L.
Societe Des Ciments Francais
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