How Slurry Transport inside a Tumbling Grinding Mills
The transport of slurry within the ball mill depends on the peripheral velocity and porosity of the ball charge. Residence time distribution and mill hold up are often used as indicators of the mode of transport. In this work, the transport problem is tackled via direct simulation of the three dimensional motion of the ball […]
Recover Manganese from Bioleaching Solution
Diminishing worldwide reserves of high-grade ores requires research be conducted to develop methods to recover metals from low-grade ores. Low-grade ore deposits are often unprofitable to mine and process because of the rising costs of energy and expense to protect our environment. Biological processing can be quite selective, is environmentally benign, and has the potential […]
Soda Ash Roasting of Antimony & Arsenic Gold Concentrate
The ability to process complex precious metal sulfide concentrates containing antimony and arsenic, in an economic and environmentally safe manner, is an important problem facing the mining industry in the United States. Preliminary experiments have been performed to evaluate the possibility of treating a complex sulfide concentrate to recover antimony and precious metals while fixing […]
Control of Copper in Carbon Gold Recovery Circuits
The American Girl Mining Joint Venture is an equal partnership between Eastmaque Gold Mines, Ltd. of Vancouver, BC Canada and MK Gold Company, a wholly owned subsidiary of Morrison Knudsen Corporation of Boise, Idaho. Underground mining and open pit methods are used to supply ore to the processing areas. Heap leaching of ore grades in […]
In-Situ Resource Recovery Testing
In-Situ mining at San Manuel, initiated in 1986, has evolved from a system utilizing an underground collection gallery to recover gravity drainage pregnant leach solution to a system primarily utilizing well-to-well leaching and recovery. This shift in production methodology began in 1989 after a study of the feasibility of well-to-well leaching. This study led to […]
Oleate Adsorption at Calcite VS Fluorite Surfaces
In-situ Fourier transform infrared/internal reflection spectroscopy (FT-IR/IRS) has been extended to study oleate adsorption at a calcite surface. The birefringent and transmission limitations of calcite were overcome by using an appropriately designed optical setup and a near-infrared (NIR) spectrometer. An adsorption isotherm was determined at pH 9.2 and room temperature. Comparison with the fluorite/oleate adsorption […]
Computer Optimization of Mineral Processing Plants
Steady-state simulation is now an operational tool used to assist mineral processing engineers in the design, adaptation and improvement of mineral processing plants. Since 1988, the computer applications team of the Mineral Technology Department of BRGM has been developing and distributing a simulation software, now in use in more than twenty countries, by universities, research […]
Precious Metal Recovery Methods
Process Selection Trends A general trend in precious metals extraction technology has been the treatment of ores with progressively lower grades. The lowest cost treatment, dump leaching of material at run-of-mine size, has been increasingly applied. For example, Zortman-Landusky (Montana) is successfully leaching material above a cutoff grade of 0.2 g/t (0.006 oz/ton) at an […]
Flotation Tank Cells
The use of tank cells over the years has provided a means for low cost, space efficient, extra capacity in existing flotation circuits. In some cases, new plants have selected tank cells as the machine of choice. Typical tank cells use high efficiency impellers for mixing, which results in low power draw. Unfortunately, these mixers […]
Build an Ultra-fine Grinding Mill
The sample was dried at a low temperature for two days. Then it was crushed in stages using a jaw crusher and simultaneously screened with a 50 mesh sieve. The resulting coarse fraction was further ground in a roller mill to a minus 50 mesh size. Thereafter, the mono-dispersed feed sizes required were prepared from […]