Compositions: coating or plastic – Coating or plastic compositions – Proteinaceous material containing
Patent
1982-05-12
1984-04-03
Poer, James
Compositions: coating or plastic
Coating or plastic compositions
Proteinaceous material containing
C04B 744
Patent
active
044405782
ABSTRACT:
The method is used in processing raw meal such as cement raw meal, powdered limestone, alumina hydrate or the like including those having relatively high alkali chloride and/or sulfate content up to 2% Cl and/or 2.5% SO.sub.3 and includes the steps of metering the dry raw meal into a processing system, pumping the raw meal in the processing system to a separate combustion chamber, supplying fuel to the combustion chamber and igniting same therein to heat the dry raw meal in the combustion chamber to a temperature between 100.degree. and 600.degree. C. Further, the heated dry raw meal is pumped to a cyclone separator through which it is processed and then supplied to a long dry process alkali rich rotary kiln. In this way, problems due to alkali rich encrustations are reduced, and the thermal efficiency of the entire preheating system is increased.
An apparatus is provided for carrying out the processing of raw meal such as cement raw meal having a relatively high alkali chloride and sulfate content, and includes a dry raw meal hopper, a continuous pneumatic pump, a mechanism for metering dry raw meal to the pump from the hopper, and a separate combustion chamber having an inlet coupled to the outlet of the pump. Fuel is delivered to the chamber and a pilot flame therein ignites the fuel to heat the dry raw meal. The combustion is controlled so that the dry meal is heated to a temperature of between 100.degree. and 600.degree. C. and then fed to a cyclone separator which feeds a long dry process rotary kiln.
REFERENCES:
patent: 3451665 (1969-06-01), Strassen
patent: 3986886 (1976-10-01), Sylvest
patent: 4035193 (1977-07-01), Miyamoto et al.
Poer James
Vigil Thomas R.
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