A study has been made of the reaction mechanisms occurring during the salt-roast process to form water-soluble sodium vanadate compounds from the vanadium oxide compounds present in vanadium-bearing ores and concentrates. Two reactions have been identified, either of which lead to water-soluble compounds oxidation of sodium chloride by water vapor and oxidation of sodium chloride … Read more
This paper summarizes the results of an investigation sponsored by The Coates Steel Products Company. The objective was to determine the relative effects of certain chemical and physical properties on the wear resistance of grinding balls when grinding cement. In making this study, a number of types of balls were used in both dry and … Read more
When is use of a flocculant justified in terms of overall process economy? when it results in process improvement, such as producing a clear liquor for electrolysis, precipitation, ion exchange, or solvent extraction; when it results in satisfying requirements of pollution abatement ordinances; when it results In increased recovery of values that would otherwise be … Read more
A unique compression testing machine was constructed to load individual 1/8 to 1-in. spheres of glass, etc., at rates from 100 to 100,000 lb per min. During loading the applied load was continuously plotted vs the deformation of the sphere-platen system. The load-deformation curve conforms to the theory of elasticity. The data shows.- 1) Energy … Read more
Talking about engineering economics in mill design reminds me of an old saying “There are several ways to handle women but nobody knows what they are.” I’m sure that the same economic factors do not apply to each of our mill designs, but for the sake of emphasis, it is well to review a few … Read more
To calculate theoretical horsepower required by a grinding mill to reduce feed material to a certain size from Bond grindability test data, it is necessary to apply the “Bond Third Theory of Comminution.” The first step in this procedure is to calculate from the following formula the work index, which is the kw-hr required to … Read more
Advances in hydrometallurgy during recent years resulted in greater attention being focused on the various unit operations involved. Some steps, similar to normal beneficiation practice—crushing, grinding, classification, etc. are well known.Others —roasting, leaching—have recently been intensively investigated from both theoretical and practical viewpoints. Less well-studied are such operations as precipitation and precipitate filtration. Continuous Filters … Read more
The preparation of aggregates is a form of mineral processing which has been taken for granted for many years, mostly because of its lack of glamour when compared to the winning of metallic minerals from their ores. Many of the processes and equipment now used in the metallic mineral processing industries originated in the more … Read more
The Alimak Raise Method, using the Alimak Climber, has proven to be a new, fast, economical method of driving raises at the Iron King Branch of Shattuck Denn Mining Corporation, Humboldt, Arizona. In order to fully understand the advantages of the Alimak Raise Climber, it is necessary first to describe the basic machine; second, a … Read more