Energy Aspects of Single Particle Crushing
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 […]
Mill Design Economics
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 […]
Cement Plant Grinding Mills Power Consumption
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 […]
Continuous Filtration of Precipitates
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 […]
Preparation and Production of Mineral Aggregates
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 […]
Alimak Raise Climber at Iron King Branch of Shattuck Mining Corp
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 […]
Wet Scrubbing of Coal Dust from Thermal Dryers
Wet scrubbing of fine coal from Thermal dryers poses a number of problems in adapting the gas cleaning equipment for required clean-up of the fine particulate matter. A wet cleaning apparatus traps the matter suspended in the gas stream in a scrubbing liquid, generally water and a great variety of equipment is used. They include […]
Search for Heavy Minerals by Equilibrium Concepts
A river delivers a given load of sand, and hence of heavy minerals, into the sea into which it empties. This load is fixed by drainage basin characteristics and processes. Wave energy available for redistributing that load is fixed in an entirely different way. Estuarine Traps Rivers which flow into estuaries, sounds, lagoons, or bays […]
Thickener Design Underflow Pump Arrangement and Automatic Controls
A number of unique thickener mechanism designs with the operating results achieved in various installations are discussed. These unusual designs include new types of raking arms, lifting devices, and feed-wells employed to obtain higher underflow densities and minimum operator control or improved overflow clarity. Thickening The conventional raking arms consist of a relatively simple truss […]
Rotary Kiln in Magnetic-Reduction Roasting
Magnetic-reduction roasting is a process in which non-magnetic ore is converted by the action of reducing gases to a state in which subsequent magnetic separation can achieve the best balance between recovery and grade. The principal characteristics of the rotary kiln method of magnetic-reduction roasting are complete processing and heat exchange within a revolving cylindrical […]