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  #1 betsy stone on 02 Sep 14

   

  However, the grinding according to the invention is further improved by an addition of a grinding aid, for example, triethanolamine. The Portland cement that is ground to the ultrafine cement may be obtained from a storage silo in which it has been stored for some time and thus allowed to cool to or nearly to room temperature, but preferably the whole manufacture is continuous,coconut shell powder machine the cement clinker being ground to the fineness of ordinary Portland cement in a conventional mill, and the ground cement then being passed through a cooler from which it flows to a mill to be ground to ultrafine cement by very small grinding bodies. A suitable cooler is a compartment cooler in which heat exchange takes place between cement fluidized in the compartment and water in external contact with the walls of the compartment.
  
  In known mills in which coarse material is ground by means of a charge of loose grinding bodies it is common to divide the interior of the mill into two or more grinding chambers separated by perforated partitions, commonly known as diaphragms. Normally each chamber has a charge of grinding bodies, the size of which depends on the degree of fineness required in the ground product. The diaphragms serve essentially as screens in allowing the ground material to pass but in retaining the grinding bodies. At the exit of the last chamber of the mill, or at the exit of mills having only one chamber,rock sand machine there is usually a similar diaphragm to prevent the grinding bodies from leaving the mill. The ground material may leave the mill directly through a diaphragm that constitutes the end wall of a grinding chamber or, in the overflow type of mill, it may leave through a hollow trunnion having a diaphragm at its entrance. If very small grinding bodies are used in such a mill they tend to clog the perforated diaphragm that is provided to retain them.
  
  The mill used for the ultrafine grinding according to the invention is preferably a tube mill with a hollow trunnion at the outlet end and (as described in U.S. application Ser. No. 647,152) has a built-in dam ring constituting a partition between a grinding chamber and a discharge chamber that leads to the trunnion, the discharge chamber being furnished with means for returning the grinding bodies to the grinding chamber through the dam ring. Thus the very small grinding bodies are continuously returned from the discharge chamber at substantially the same rate as they enter it, and at the most only a small proportion leaves the mill with the ground product. The ultrafine cement itself flows out of the mill without any hindrance and is discharged without requiring any auxiliary machinery, whereas in the normal methods of grinding ultrafine cement the ground cement is carried out of the mill entrained in a current of air.

   

  <div class="cArrow"> </div><div class="cContentInner">However, the grinding according to the invention is further improved by an addition of a grinding aid, for example, triethanolamine. The Portland cement that is ground to the ultrafine cement may be obtained from a storage silo in which it has been stored for some time and thus allowed to cool to or nearly to room temperature, but preferably the whole manufacture is continuous,<a href="http://www.sellercrusher.com/project/coconut-shell-powder-machine.html" rel="nofollow">coconut shell powder machine</a> the cement clinker being ground to the fineness of ordinary Portland cement in a conventional mill, and the ground cement then being passed through a cooler from which it flows to a mill to be ground to ultrafine cement by very small grinding bodies. A suitable cooler is a compartment cooler in which heat exchange takes place between cement fluidized in the compartment and water in external contact with the walls of the compartment. <br /> <br /> In known mills in which coarse material is ground by means of a charge of loose grinding bodies it is common to divide the interior of the mill into two or more grinding chambers separated by perforated partitions, commonly known as diaphragms. Normally each chamber has a charge of grinding bodies, the size of which depends on the degree of fineness required in the ground product. The diaphragms serve essentially as screens in allowing the ground material to pass but in retaining the grinding bodies. At the exit of the last chamber of the mill, or at the exit of mills having only one chamber,<a href="http://www.sellercrusher.com/project/rock-sand-machine.html" rel="nofollow">rock sand machine</a> there is usually a similar diaphragm to prevent the grinding bodies from leaving the mill. The ground material may leave the mill directly through a diaphragm that constitutes the end wall of a grinding chamber or, in the overflow type of mill, it may leave through a hollow trunnion having a diaphragm at its entrance. If very small grinding bodies are used in such a mill they tend to clog the perforated diaphragm that is provided to retain them. <br /> <br /> The mill used for the ultrafine grinding according to the invention is preferably a tube mill with a hollow trunnion at the outlet end and (as described in U.S. application Ser. No. 647,152) has a built-in dam ring constituting a partition between a grinding chamber and a discharge chamber that leads to the trunnion, the discharge chamber being furnished with means for returning the grinding bodies to the grinding chamber through the dam ring. Thus the very small grinding bodies are continuously returned from the discharge chamber at substantially the same rate as they enter it, and at the most only a small proportion leaves the mill with the ground product. The ultrafine cement itself flows out of the mill without any hindrance and is discharged without requiring any auxiliary machinery, whereas in the normal methods of grinding ultrafine cement the ground cement is carried out of the mill entrained in a current of air.</div>

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