An Improved Method for the Production of Portland Cement from Chalk amp; Clay amp; in Conjunction with the Rotary Kiln Process, or any other kind Kiln for Burning Cement.

摘要

7110. Gostling, C. R. March 24. Cements.-The chalk, together with the contained flints, is crushed or ground in the dry or natural state. The clay, before it is added to the chalk, is dried sufficiently for the mixture to pass through edge-runners, and the material is then conveyed into a revolving cylinder boated by the exhaust gases from the rotary kiln, in order to dry it. Drying-floors, heated by steam or otherwise, may be used instead of the revolving cylinder. The material is elevated into hoppers, which may contain revolving mixing-blades, and from the hoppers it passes to tube mills or other grinding- machinery, which reduce it to an impalpable powder. The powder is conveyed through a worm conveyer to the rotary kiln, and, during its passage through the conveyer, a small percentage of moisture is added by means of exhaust or live steam, or water, for the purpose of binding the materials together. Instead of burning the powder in a rotary kiln, it may be made into brick form in a powerful press and burnt in any ordinary kiln.