856 M w TOU i Ml BEDM 



| vnlur industry, Mr W. A. Smith gives 



the following interesting contemporary account of this kiln. 



furnace consists of a sheet-iron cylinder, 



. inclined toward the firing end § inch to 1 foot. 



et in diameter for a Length of 20 feet, 



and is lined 9 inches thick with a mixture of ground fire brick and 



mol The remainder of the cylinder, 55 feet long, lias a 



diamel and is lined with 6 inch tire brick. Only the 



linn -he hot end requires renewal, and this can be replaced 



in 10 hours, at a cost of $25. The cylinder revolves on cast 



D rollers three times a minute. The power required is five 



horse-pow< 



the lower end a small coal fire is kept np on a grate, but 

 fuel is crude petroleum, introduced in a jet which 

 meets the h«>t air blast. The consumption of oil is 8 gallons 

 per barrel of cement clinker produced. 15 barrels of oil are re- 

 quired to heat the furnace ready for burning cement. 



The clay and marl are mixed wet and run in as a slurry at 

 t.he upper end. The mixture in drying forms a sand, which 

 moves slowlv downward with the turning of the cvlinder, and 

 is finallv discharged at the lower end as cement clinker of the 

 size of small gravel. It takes two hours to run the particles 

 through. The operation is continuous, and the product is 250 

 barrels per day. It is claimed that all the mixture is burned to 

 Portland clinker. 



From a series of analyses and tests, for which I am indebted 

 to Mr Duryee, I have selected the following: 



ANALYSES OF MATERIALS USED AND RESULTING PRODUCT AT 



MONTEZUMA 



MARL 1 CLAY CEMENT 



lime 47. G8 62.22 



lea 6.22 59.22 22.51 



Alu,nma 1 ' 7 I 20.82 i 9 ' 17 



Ir-»n o>:id GG » ( 2.54 



Mi la .52 3.09 1.08 



Carbonic acid .. . . 42.11 1.86 



i Calculated without moisture. 



