LIX63 in combination with DNNS selectively extracts nickel and/or cobalt from acidic leach liquors with pH values as low as 1.0. Nickel/cobalt and cobalt/nickel selectivities are achieved by varying the relative concentrations of LIX63 and DNNS. Increasing LIX63 concentration retards both extraction and stripping rates while DNNS has the opposite effect. Slope analyses of equilibrium … Read more
Tar sand deposits in the State of Utah contain more than 25 billion barrels of in-place bitumen. Although thirty times smaller than the well-known Athabasca tar sands, Utah tar sands do represent a significant domestic energy resource comparable to the national crude oil reserves (31.3 billion barrels). The term “tar sand” refers to a consolidated … Read more
Dissolved zinc concentrations averaged 9,400 µg/L (micrograms per liter) in water from abandoned lead and zinc mines, some of which discharge at the surface. Contamination of the shallow aquifer by the highly mineralized mine water is limited to the immediate mining area. The quality of water in the deep aquifer is generally excellent and unaffected … Read more
In recent years, hydrometallurgical processes for recovery of metal values from low-grade ore minerals have played an increasingly important role. Dump leaching of low-grade copper waste materials in the western United States now yields 11.5% of the total U. S. copper production. Although scavenger operations in uranium leaching have been successful, the state-of-the-art of in-situ uranium … Read more
The economic limit of an open pit mining operation is dictated by three basic elements- cut-off grade, stripping ratio and slope angle. Although these elements are interrelated, they are functions of a number of independent parameters, which are too numerous to list completely. Simply stated, the following relationships are true: Economic Pit Limit = f … Read more
Direct control of ball mill inventory has been the goal of a number of investigators over many years. To put some numbers on these concepts consider a 250 ton mill with 3 nominal 10 ton inventory that should be controlled to one part in forty that is a 2.5% band or ¼ ton. This will require a … Read more
The essential elements of thickener basin construction consist of: Laboratory testing and selection of soil materials for thickener bottom and determination of required thickness of treated blanket. Rough grading of site to bottom slopes of thickener basin. If imported soil materials are to be used, establish rough grade at bottom slopes minus 150 to 450 … Read more
Three Reversible Impactors are located at the Piney Point Plant, Palmetto, Florida. This plant is part of the Davison Chemical Division of Borden Chemical Co. These machines reduce diammonium phosphate or granular triple superphosphate (GTSP) from a feed of 75 x 3.35mm (3″ x 6 mesh) to an 852-952 minus 3.35mm (6 mesh) product. Capacity … Read more
The possibility of increasing the efficiency of mineral processing plants by means of computer control has prompted metallurgists to examine their flowsheets more critically in order to develop practical control strategies. Control schemes in use to date generally rely on the automation of traditional and previously manually regulated control loops, for instance the addition of … Read more
As indicated in the introduction to this paper, it is a sequel to that which i gave to the last annual meeting in Atlanta in march, this paper goes further into aspects of crushing and screening, primarily from the standpoint of circuit control. By proper control over the use of crushing energy, we will be able … Read more