Thionocarbamates Collector & Sulfide Flotation & Adsorption
The mineral processing industry has recently shown an interest in developing new collectors that can be used for selective flotation at lower pH levels. The desired end result is to reduce lime consumption and to improve the efficiency of separation in the treatment of complex and low-grade ores (Nagaraj et al., 1986c). One such reagent, […]
SABC Grinding Circuit
Brief Geology in Relation to Work Index Variation To understand the need for a SABC Grinding Circuit it is pertinent to briefly describe the geology. Gold mineralisation at Kidston occurs in the marginal areas of an oval breccia pipe. Gold and silver are disseminated within the breccias and veins formed after brecciation. The ore is […]
Slope Stability Determination Methods
Methods suitable for slopes in soil like materials, where the strength of the material can be determined from testing small specimens of the material in a laboratory. Classical soil mechanics slope stability analysis and material strength testing methods are applicable. Methods suitable for slopes in hard jointed rock where the stability of the slopes is […]
Thickener Operation and Flocculant Application
At start-up, the relatively high level of feed solids, 17-20%, called for in design led to difficulties in achieving the degree of flocculation necessary to meet required settling rates. It was recognized that decreasing feed solids would improve thickener performance while reducing flocculant consumption (Figure 2). This was accomplished by recycling thickener overflow to the feed […]
Estimating Weak Rock Strength
Factors Controlling the Strength of Weak Rock Masses: For the purposes of this paper a weak rock mass is defined as any rock mass in which the effective shear strength parameters are less than: effective cohesion, c’ = 25 psi (0.2 Mpa) effective friction angle, ∅’ = 30° using the Mohr Coulomb failure criticism. This would […]
Kinetics of Sulfuric Acid Leaching of Brass
Effect of Temperature and Acid Concentration: The effect of temperature on the leaching behavior of copper and zinc is shown by the data in Figures 1 through 4. In these experiments, leaching solutions were well stirred at 550 rpm and open to air. “Fraction Extracted” refer to that portion of the total copper and zinc that […]
Carbon in Leach with Oxygen CILO Process for Gold Ores
This paper describes a new development in the cyanidation of gold ores, which we expect will result in a major improvement in the way many gold ores are treated. The process has evolved through work at Hazen Research, Inc. for Kamyr, Inc. and in brief, the consists of utilizing oxygen rather than air in the […]
Barmac Crusher Efficiency
Because of the nature of the breakage in the Barmac vertical spindle impactor, the 80% reduction ratio is very small, so that when the energy efficiency is calculated by Bond’s method, it appears to be very low. However, the product size distribution contains a high proportion of fines. It is argued that the production of […]
Uranium Recovery by Acid Elution of Resins
An effective technique has been developed to elute ion exchange resins loaded in the carbonate leaching process for uranium recovery. The procedure involved elution with about 0.5 to 2 bed volume of 36.5 g/l. HCl, followed with 5 to 10 bed volume of acidic solution containing 3.65 g/l. HCl and 58.5 g/l. NaCl. This procedure […]
Effect of Grinding Media on Flotation Chemistry
The flotation behaviors of pyrite and pyrrhotite in a Hallimond tube were correlated with the galvanic role they developed in two- and three-electrode combinations with mild steel under non-abrasive conditions. These correlations substantiated the hypothesis that a coating of iron hydroxides, originating from galvanic interactions, lowered the flotation responses of sulfide minerals. However, interactions between […]