Reduce Ball Mill Wear by Cathodic Protection
The present work was undertaken to develop a method to cathodically protect a ball mill to reduce materials loss from mill liners. The essential science of “Cathodic Protection” is to apply a sufficiently negative potential to a metal in a corrosive environment such that the anodic corrosion rate is reduced to a negligibly small or […]
Classification System Efficiency
Iodide Pressure Oxidation Gold Leaching – Autoclave
The pressure oxidation process is especially suitable for the sulfide type of refractory ores. It includes two stages of operation. First, the refractory ore is subjected to an autoclave oxidation. At elevated temperatures usually above 180°C and in acidic or alkaline medium and pressurized oxygen, sulfide minerals are oxidized for a period of 1-2 hours. […]
Ammonia Gold Dissolution Leaching
Processes for gold extraction usually depend on how gold is associated with its environment. Although cyanide leaching remains the overwhelming option for the treatment of gold ores, because of its economy and simplicity, it suffers from certain inherent drawbacks such as toxicity, low leaching rate and its inefficiency of treating certain classes of refractory ores. […]
High Pressure Roll Grinding for Copper Heap Leaching
Technology improvements in copper mining operations have been the key factor for increasing productivity. Beyond dump leaching, the industry will increasingly use various heap leach techniques in SX-EW operations in the coming years in order to optimize recovery and maintain low production costs. They include: Finer comminution followed by agglomeration. Finer comminution followed by coarse […]
Effect of Water Chemistry on Flotation Performance
The two size reduction/froth flotation interactions described in this paper are strongly related to optimally using the inherent electrochemical surface rearrangements that occur on selected sulfide minerals, e. g. chalcopyrite, molybdenite, pentlandite, etc. Based on data generated in numerous fundamental studies, it is not surprising that utilizing the electrochemical transformations that occur with grinding could […]
Ceramic from Ilmenite & Zircon
The direct conversion of mineral concentrates into useful ceramic materials, without several intermediate processes, is of great interest to the materials community. Recently there has been increased interest in producing ceramic powders with very small sizes (in the order of nanometers) starting with mineral precursor. Thermal plasma processing of mineral concentrates may be used to […]
Convert Valve and Elbow to Equivalent Length of Pipe
The 150mm (6″) elbows have a S value of 1.7 per Table II. This multiplied by 10 and 6″(150 mm) gives an equivalent length of straight pipe of 102′(31m).
Protection against Rockfall by Steel Wire Rope Safety Net Systems
Wire Rope Net Rockfall Barriers A rockfall protection system with the appropriate strength characteristics and height can be designed. Wire rope net rockfall protection barriers of varying designs have been engineered with the proven ability to withstand impact kinetic energies ranging from 81 kJ (30 ft-tons) for the simplest of designs, to a maximum of […]
Remove Micronized Magnetite from Coal
The micronized-magnetite coal cleaning technology is based on widely used conventional dense-medium cyclone applications, in that it utilizes a finely ground magnetite/water suspension as a separating medium for cleaning fine coal, by density, in a cyclone. However, the micronized-magnetite cleaning technology differs from conventional systems in several ways: It utilizes significantly finer magnetite (about 5 […]