The flotation process . ner to a point where he can test efficiently. *By permission of the Director, U. S. Bureau of Mines. Communicatedby D. A. Lyon, metallurgist in charge of the Salt Lake station of the U. of Mines, co-operating with the University of Utah. 0. C. Ralston,Assistant Metallurgist of U. S. Bureau of Mines, and Glen L. Allen, ResearchFellow of the University of Utah. 278 THE FLOTATION PROCESS None of the literature mentions the fact that it is difficult to geta high percentage of extraction and a high grade of flotationconcentrate at the same time. The beginner often s
The flotation process . ner to a point where he can test efficiently. *By permission of the Director, U. S. Bureau of Mines. Communicatedby D. A. Lyon, metallurgist in charge of the Salt Lake station of the U. of Mines, co-operating with the University of Utah. 0. C. Ralston,Assistant Metallurgist of U. S. Bureau of Mines, and Glen L. Allen, ResearchFellow of the University of Utah. 278 THE FLOTATION PROCESS None of the literature mentions the fact that it is difficult to geta high percentage of extraction and a high grade of flotationconcentrate at the same time. The beginner often strives afterboth of these things in a single test, whereas he should determinehow each can be attained before he attempts to obtain both simul-taneously. Furthermore, it is difficult to manipulate a small machineto give as good results as a large one, until after considerable the small machine is generally pessimistic, compared with thelarge one. It is practically essential for the beginner to weigh and Feed. Concenfrafe Tailing- Fig. 54. the macquisten tube. assay all of his products in order to see if the extraction and thegrade of concentrate are satisfactory, where an experienced manipu-lator can often tell by aid of past experience and the use of a glassor microscope whether he is getting good results or not. With these points in view, we shall describe first the satisfactorymachines and their operation. Then we shall give a more generalexposition on what variables to study and what points to observe. Flotation test-apparatus must necessarily be classified in the sameway as large-scale machines, namely, as film-flotation machines, acid-flotation machines, and froth-machines of both pneumatic andmechanically agitated types. Film-flotation, as exemplified in the TESTING ORES FOR THE FLOTATION PROCESS 279 Macquisten^ and in the Wood machines, does not seem to havethe same wide application as does froth-flotation; hence little needbe said about them. Film-Flotation
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