Limestone Flotation Circuit
From time to time since the initial installation of an experimental flotation section in 1940, Permanente Cement Company has made efforts to beneficiate the low-grade limestone fraction which occurs in its deposit at Permanente, California. Limestone and the Reason for Its Beneficiation The Permanente deposit is a sheet of Calera limestone over 700 feet thick […]
Copper-Nickel Ore Processing
A nickel-copper sulphide concentrate was treated in a pilot plant at Warren Spring Laboratory during 1961, by a hydrometallurgical roast-leach-solvent extraction process devised to cleanly separate the metal values, and produce acid sulphate liquors containing the metals. It is shown that 86 percent of the nickel and 95 percent of the copper could be leached […]
Beneficiation Beach Sands by Magnetic Dry Processing
The author describes the actual processing of the government stockpile of chromiferous sands located at COQUILLE, OREGON, during 1955 and 1956. A general history of the stockpile is given, along with a background of the geology and origin of these sands. The flow sheet used in this operation is outlined in detail, and the minerals […]
Rock Drillability
Costs of boring holes in rock have always been a major item in mineral exploration, development, and extraction and in rock excavation in industries other than mining. Efforts to reduce the costs have been made by the drilling industry for many years. Rock drillability studies were started at the Twin Cities Mining Research Center in […]
Pure Phosphoric Acid from Hydrochloric or Sulfuric Acidulated Rock The Imi Process
The Israel Mining Industries Institute for Research and! Development has developed, during recent years, a number of new processes for fertilizer materials. Their phosphoric acid processes, however, are capable of producing an acid of far higher quality than that normally associated with fertilizer grade acid. Unground phosphate rock is fed into the first of a […]
Sludge Production Control from Wet Phosphoric Acid Processing
The accumulation, handling, and utilization of sludges formed from wet process phosphoric acid is one of the major problems in the industry. The purpose of this paper is to explain some of the considerations and techniques that can be employed to provide some measure of control over the problem. An acid made from a Central […]
Pneumatic Stowing – Backfilling Technique
Pneumatic stowing was first introduced in longwall mining in the middle twenties. Since that time it has advanced through many stages of development, particularly abroad, which have greatly improved its efficiency and contributed to its growing use. Pneumatic stowing originated in coal mining but has also been adopted in metal mining. Pneumatic Conveying of Stowing […]
Techniques for Grinding Circuit Control Optimization
There is much interest in the automation of entire comminution circuits. At the present technological level it is possible to automate a circuit but to date it has not been done. To successfully automate a circuity a number of problems must be solved. Not all of them are engineering problems. The purpose of this paper […]
Bedded Deposit Mining Methods
The planning of an underground mine for successful extraction of a bedded deposit in sedimentary rocks requires the integrated evaluation of many interdependent problems. The development and coordination of feasible solutions are the responsibility of the mining engineer. One of these problems will be discussed herein; this is the design and layout of mine workings […]
Magnetic Mechanical Separator
Over a considerable period of time great interest has been shown in selective dry concentration of fine ferromagnetic particles, although it is only recently that new permanent magnetic materials have been made available to permit building of such permanent magnetic separators. It is well known that the conventional drum separator does not efficiently separate fine […]