xviii TABLE OF CONTENTS. 



PAGB 



Plans of actual plants 404 



Actual equipments of dry-process plants 408 



List of references on dry-process plants and methods 410 



Methods used with slag limestone mixtures 411 



General methods 411 



Composition of the slag. 412 



Granulating the slag 413 



Drying the slag 413 



Grinding the slag 414 



Composition of the limestone 414 



Economics of using slag-limestone mixtures 414 



References on slag-limestone mixtures 415 



Blast-furnace methods of making cement 415 



Wet methods of preparation 416 



Disadvantages of wet methods 416 



Treatment of the marl and clay 417 



Power and output in wet grinding 417 



Agitating the mix 418 



Old-style wet methods 419 



Actual equipment of wet-process plants 420 



List of references on wet-process plants and methods 421 



General crushing practice in cement plants 422 



Necessity for fine grinding 423 



Actual fineness attained in practice 424 



Gradual vs. one-stage reduction 424 



Present day systems 425 



The omission of separators in cement plants 426 



Advantages of separators 426 



Disadvantages of separators 427 



Uniformity of product destroyed 427 



Great fineness prevented 427 



CHAPTER XXXV. 



STANDARD TYPES OF CRUSHING AND PULVERIZING MACHINERY. 



Classification of grinding machinery 429 



Class 1 . Jaw crushers 430 



Class 2. Cone grinders or gyratory crushers 430 



Class 3. Rolls 433 



Class 4. Millstones 437 



Class 5. Edge-runners: Dry pans 437 



Class 6. Centrifugal grinders 438 



Huntingdon mill 438 



Griffin mill 440 



Kent mill 443 



Class 7. Ball grinders 447 



Kominuter. . 448 



