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10/06/2014 Distance Learning Courses
The process of making raw cement mix which comprises grindingthe raw materials with an excess of Water, adding fine dustto the slnrrythus formed, heatingthe slurryV -4and. 'assing the heated slurry into continuous lters.<a href="http://www.robocrushers.com/faq/antimony-mining-equipment.html">Antimony Mining Equipment</a> I fThelprocess of forming cement 'by wet grinding 'which comprises grinding the' 'solid material with water to form a slurry adding flue dust tol the slurry; heating the ue dust and slurry mixture to increase the filtering capacity, filtering .the fine dust and slurry-in a continuous filter' and'feeding the filter cakeV to the kiln.This invention relates to additive compositions for incorporation in hydraulic cements, for example, Portland cements, the resultant hydraulic cement mixes containing the additive compositions, and to the process for making these cements.
This invention relates more particularly to additive compositions for use as grinding aids and pack set inhibitors in the manufacture of hydraulic cements and to hydraulic cements containing these compositions.
Hydraulic cements are produced by calcining suitable raw materials, generally a mixture of calcareous and argillaceous materials, to produce a sintered "clinker." Of the hydraulic cements,<a href="http://www.robocrushers.com/faq/marble-powder-plant.html">Marble powder plant</a> portland types are by far the most important cements in terms of quantity produced. The clinker is mixed with small amounts of gypsum and ground, usually in some type of ball mill, to a finely divided state having a relatively large surface area to yield the finished cement. Grinding of the clinker consumes substantial quantities of time and energy. It is common practice in the cement industry to employ grinding aids which increase the efficiency of the grinding operation thereby lowering the power required to grind a unit of cement and which decrease the plant investment either by increasing the through put of a given grinding mill or by reducing the size of mill needed to grind a given amount of cement. The addition of a grinding aid enables the mill to grind the clinker to a smaller size with less energy by prohibiting the buildup of a coating of finer material on the grinding media and walls of the mill by coating the nascent surfaces of the cement clinker. This coating of the cement clinker reduces the higher energy forces present on the nascent surface. Caution must be taken to prevent undue reduction of the surface forces because the cement becomes excessively fluid.