“Rotary percussion” implies two types of energy, rotary and percussion. Into these categories fall rock drills of varying sizes. The larger ones drill above 6″
Four basic designs of ropes are now employed for hoisting duties: Six-strand, round strand ropes with fibre cores. Six-strand, triangular strand ropes with fibre cores.
In the operation of today’s large scale ore-processing mills, it is extremely important to have some way of making an objective evaluation of the performance
Field criteria are needed to help the prospector recognize a potentially expansible shale, clay, or slate. Certain criteria have proven useful in California even though
For reasons well known to Mining Engineers, fine grinding in the wet form is quite universal in plants engaged in the extraction of metallic values
The problems of slope stability in open-cast mines are examined. A criterion, the instantaneous stripping ratio, is suggested for use in the design of pit
The concurrent observation of the phenomena of alkali-aggregate reaction and development of efficient dust collection systems on rotary-kilns made mandatory the process modifications to produce
The technique of growing crystals from the melt, such as KI, NaBr, was already commercially in use. Quartz could not be so grown, since its
In portland cement manufacturing, the raw materials are changed to clinker in the burning operation. Generally the rotary kiln is used for this purpose and
A process for producing reductive bleach in-situ in kaolin slurries has been developed. The bleach is formed by mixing an iron sponge powder (-325M) with