Repair Ball Mill Discharge Trunnion Crack
There was a continual increase in ball mill lubrication oil consumption. However, visual inspections could not confirm the presence of a trunnion oil seal leak. By the end of month it was assumed that the only possible place for this leak was at the outboard discharge trunnion seal so that oil was leaking into the […]
Red Dog Mine
The Red Dog zinc/lead deposit in northwest Alaska is the second largest zinc deposit ever discovered. Being developed by Cominco Alaska with startup scheduled for early 1990, it will ultimately be the largest zinc mine in the Western World. Red Dog was discovered by a local bush pilot, Bob Baker, in 1968. The U.S. Geological […]
Carbonate Buffer in Soil
Data from analysis of mineralogy, water extracts, and groundwater demonstrate the significance of the neutralization of the acid from the tailings by the carbonate in the soil on the processes of retardation of contaminants. The observed data are consistent with the results of the thermodynamic calculations done with PHREEQE for the concentrations of components exiting […]
Jarosite Production
Jarosite Production: The roast-leach-electrowin process for zinc production involves roasting zinc sulphide concentrate to produce calcine containing zinc oxide. Zinc concentrate roasted at Risdon typically contains about 11% iron, which is predominantly converted to zinc ferrite (ZnFe2O4) during the roasting operation. When the calcine is leached under weak acid conditions (pH ≤ 2) only the zinc oxide […]
Calcium Montmorillonite Flocculation
The flocculation process involving fine particles and organic polymers can be depicted by the following sequence: adsorption of the polymeric species on particles, conformational changes in the adsorbed polymer molecules, and collisions between particles to form flocs through bridging. Flocculation is the result of mixing the polymer with the particle slurry in some device, e.g., […]
Smectite Ceramics
Smectite is the name for a group of sodium, calcium, magnesium, iron, lithium aluminun silicates which include the minerals sodium montmorillorite, calcium montmorillonite, saponite, nontronite, and hectorite. The rock in which these smectite minerals are usually dominant is bentonite. The theoretical formula without considering lattice substitutions is (OH4Al4Si8O20 · N H2O (interlayer), and the theoretical composition […]
Heap Leach Solution Management
Column testwork on run of pad ore composites has shown that varying the solution application rate from .005 gpm/ft² to .001 gpm/ft² has no effect on the overall silver or gold extraction after a short period of time of 2-3 weeks. The pregnant solution grade is inversely proportional to application rate leading to like extraction […]
Determining Corrosion Rates in Grinding Environments
Researchers at the Bureau of Mines, U.S. Department of the Interior, developed and tested equipment to measure corrosion rates on a commercial-scale mill. Bench-scale experiments were also designed for duplicating ore grinding conditions closely enough that realistic rate determinations can be made in laboratory tests. Rates measured in a laboratory system compared favorably with those […]
How to Remove Soluble Manganese
The granular media used for the study of soluble manganese removal included natural manganese oxide ore. The manganese oxide ore of South Africa origin obtained from Elkem Company (Marietta, OH) was used as the medium for soluble manganese removal. The raw manganese oxide ore sample was crushed and ground into particles of 1.0-0.425 mm (-No. […]
What is Zeolite used for
However, in a number of applications, natural zeolites have inherent advantages, not the least of which is that natural zeolites cost much less than the synthetics. Fish and Shellfish Farming: Clinoptilolite (clino) can remove ammonia in aquaculture ponds and tanks. Clino has been successfully used in biofilters, regenerable ion exchange beds and pressure filters; and […]