80-120t/h stone crusher plant of the presence
#1

When charging the gypsum into the clinker cooler 3 as proposed according to the invention, the gypsum is dehydrated and dried during its transport together with the hot clinker material through the cooler, and any additional gypsum to be added for adjustment of the gypsum percentage may, e.g., be added from a gypsum container 21 via a line 23.An important object of the invention is to facilitate the grinding operation and to reduce the time required for grinding a given quantity of material to a certain degree of ineness.A further object of the invention is to prem vent the deleterious effect upon Portland cement clinlrer or other cementitious materials of the presence of moistue or water vapor in the gaseous mediumy in which the grinding is conducted; by lowering the relative humidity of such gaseous medium. In the case of Portland cement clinker the deleterious effect of grinding in air or other gas having a high relative humidity consists principally in the production of a cement having too -quick a setting time to permit satisfactory use thereof.

In grinding Portland cement clinker toa fine state of subdivision to produce finished cement, and particularly in grinding such material to the fineness required for the production of .a cement having high early strength, I have found that the presence of moisture or ofa high relative humidity retards the rate of grinding. For example,when grinding cement to a neness of 95% minus 200 mesh, variations in the relative humidity of the atmosphere have such an effect that the grind obtainable in 24 hours under conditions of high relative humiditys can be accomplished in two to three hours on a dry day. An additional effect which I have noticed is that such cement finely ground on a damp day has a very quick set, or I might say a Hash set, whereas cement finely ground on a dry day has a much slower or normal setting time.

My improved process of grinding consists in maintaining the relative humidity of the gaseous medium in which the inding operation is conducted suiciently ow to produce Serial No. 197,302.the desired results, and particularly to facilitate the grinding andpermit the cement material to be ground to the desired fineness While maintaining substantially the normal setting time thereof. Since the relative humidity of such gaseous medium is dependent upon the temperature thereof, the process also includes the regulation or control of the temperature of the material being ground, and of the air or other gaseous medium surrounding l intermittently introducing a gas of low relative humidity into the grinding chamber of said device, and means may also be provided for maintaining the temperature of the vmaterial being ground suliiciently high to preventV reduction of the temperature ofx such gaseous medium below the dew point thereof.
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