IX, A. 1 West and Cox: Philippine Cement Raw Materials 89 



I, fig. 2, is from a photograph of characteristic samples of clinker 

 produced in this manner. When the blocks of raw material 

 have been sufficiently vitrified and the furnace has cooled, the 

 black clinker can easily be removed by gently tapping the 

 clusters of blocks which are sintered together. A furnace of 

 the dimensions indicated in the diagrams yields about 800 grams 

 of well-burned clinker in one burning. 



The suitability of our horizontal stationary kiln for burning 

 cements was demonstrated by burning therein an average sample 

 of raw cement mixture obtained from a cement company whose 

 well-burned product meets all specified requirements. Seger 

 cones supported on platinum were placed in the furnace behind 

 the mixture out of the direct path of the flame. The mixture was 

 then burned to a clinker in the manner above described, after 

 which it was pulverized and tested. The temperature recorded 

 by the Seger cones was 1,500°. Analyses recorded in Table IV 

 show the composition of this mixture and of the cement ob- 

 tained from it. 



Table IV. — Analysis of the cement company raw m,ixture and cement 



obtained from it. 



Constituent. 



Silica (Si O2) 



Alumina (AI2O3) 



Ferric oxide (Fez O3) 



Lime(CaO) 



Magnesia (Mg O) 



Volatile 



Total- 



99.74 



Analysis 

 of mix- 

 ture. 



Analysis 

 of ce- 

 ment. 



Per cent. 



Per ceni. 



14.02 



20.76 



5.93 



0.87 



1 12.50 



42.12 



64.80 



1.81 



2.14 



34.99 







100.20 



The silica to alumina (plus iron oxide) ratio of the mixture is 2.06. 

 The cementation index of the mixture is 1.04. 

 The cementation index of cement is 1.06. 



Pats of this nonaerated neat cement ^^ after undergoing the 

 boiling test proved to be unusually sound and adhered to the 

 glass plates with great tenacity. As is well known the ordinary 

 commercial brands of cement after undergoing the boiling test 

 do not adhere A^ery firmly to the glass plates. The specific 

 gravity was 3.20, and the tensile strength of standard, 1 : 3 



" It was properly burned, so that no aeration was necessary to carbonate 

 the free lime. 



