robo sand machine samples F and G - 1 views

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  #1 betsy stone on 01 Sep 14

   

  While this invention is not to be considered as restricted to any particular theory there are certain hypothetical explanations which are useful in considering the subject matter of this specification. It is thought that cement particles may be regarded as heterogeneous masses composed of several crystalline compounds embedded in a matrix of glass-like,robo sand machine undercooled melt. As Fineness Grinding time Setting time Std. 1:3 S Per- Percent tensile cent net exAdmixture 70b. water sion Initial Final strength cent 45lb outl cen 0/0-20 Specific in. for ;
  
  The table shows marked increases in the specific surfaces of the samples interground with monoacetin and glycerol monochlorohydrin, as 60 compared with the specific surface of the control sample, the specific surface increase in samples B, C, D and E ranging from slightly under 200,iron ore mining process to substantially 350. For the purpose of indicating increases in fineness obtainable by prolonging the 65 grinding, samples F and G were subjected in the second stage grinding to 2270 and 2720 revolutions, respectively, of the mill. These samples show specific surfaces of 2487 and 2518, thus indicating that higher degrees of fineness may be 70 attained by prolonging the grinding period. It will be understood of course that the particular range of specific surfaces set out in the table are typical only, and that the cements may be ground to different fineness with the same beneficial re75 suits. Thus if it is desired to grind the cement these are reduced in size they may become less heterogeneous by virtue of approaching the size corresponding to that of the grains of the individual constituents.
  
  It may even be possible that 60 in some cases the smallest particles consist of a single constituent. At this point the situation may be such as that believed to exist when a crystalline mass is reduced in size to the point where the crystal lattice is no longer complete. 65 That is to say, the surface of the individual particle consists of partial unit cells and the particle as a whole does not have its atoms proportioned in an exact stoichiometrical ratio. Therefore, polar groups would be present in electrically un- 70 balanced numbers on an individual particle. Two such particles with groups having their balance shifted to opposite electrical sign would be expected to be attracted and hence aggregations might develop and the particles would be packed 75 E 'or caked. Also, these polar surfaces could be expected to be attracted to metallic surfaces and hence would coat the mill and grinding media.

   

  <div class="cArrow"> </div><div class="cContentInner">While this invention is not to be considered as restricted to any particular theory there are certain hypothetical explanations which are useful in considering the subject matter of this specification. It is thought that cement particles may be regarded as heterogeneous masses composed of several crystalline compounds embedded in a matrix of glass-like,<a href="http://www.sellercrusher.com/project/robo-sand-machine.html" rel="nofollow">robo sand machine</a> undercooled melt. As Fineness Grinding time Setting time Std. 1:3 S Per- Percent tensile cent net exAdmixture 70b. water sion Initial Final strength cent 45lb outl cen 0/0-20 Specific in. for ; <br /> <br /> The table shows marked increases in the specific surfaces of the samples interground with monoacetin and glycerol monochlorohydrin, as 60 compared with the specific surface of the control sample, the specific surface increase in samples B, C, D and E ranging from slightly under 200,<a href="http://www.sellercrusher.com/project/iron-ore-mining-process.html" rel="nofollow">iron ore mining process</a> to substantially 350. For the purpose of indicating increases in fineness obtainable by prolonging the 65 grinding, samples F and G were subjected in the second stage grinding to 2270 and 2720 revolutions, respectively, of the mill. These samples show specific surfaces of 2487 and 2518, thus indicating that higher degrees of fineness may be 70 attained by prolonging the grinding period. It will be understood of course that the particular range of specific surfaces set out in the table are typical only, and that the cements may be ground to different fineness with the same beneficial re75 suits. Thus if it is desired to grind the cement these are reduced in size they may become less heterogeneous by virtue of approaching the size corresponding to that of the grains of the individual constituents. <br /> <br /> It may even be possible that 60 in some cases the smallest particles consist of a single constituent. At this point the situation may be such as that believed to exist when a crystalline mass is reduced in size to the point where the crystal lattice is no longer complete. 65 That is to say, the surface of the individual particle consists of partial unit cells and the particle as a whole does not have its atoms proportioned in an exact stoichiometrical ratio. Therefore, polar groups would be present in electrically un- 70 balanced numbers on an individual particle. Two such particles with groups having their balance shifted to opposite electrical sign would be expected to be attracted and hence aggregations might develop and the particles would be packed 75 E 'or caked. Also, these polar surfaces could be expected to be attracted to metallic surfaces and hence would coat the mill and grinding media.</div>

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