Dynamic modelling and simulation of semi-autogenous mills

Salazar, José Luis; Magne, Luis; Acuña, Gonzalo; Cubillos, Francisco

doi:10.1016/j.mineng.2008.04.009

Cited by 42 publications

(26 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There are also centrifugal and frictional forces when the particles are in contact with the liners and lifters (Khanal et al, 2008), and the type of mineral, blasting characteristics under ground, grinding media size etc. also play a role (Salazar et al, 2009). A higher mill load can also increase the wear rate of particles.…”

Section: Types Of Millsmentioning

confidence: 99%

The effect of ore blends on the mineral processing of platinum ores

Tonder

Deglon

Napier-Munn

2010

Minerals Engineering

View full text Add to dashboard Cite

This thesis investigates the effect of ore blends on milling and flotation performance. Anglo Platinum's Waterval UG2 concentrator in Rustenburg processes ore from various shafts. The thesis was initiated to gain a better understanding of the type of interactions between the ores that consequently affect metal accounting at the concentrator. Four ores were sourced from the following shafts: Salene ore (x 1 ), Waterval UG2 ore (x 2 ), Paardekraal ore (x 3 ) and Townlands ore (x 4 ). The literature review indicates various experimental mixture designs that could possibly be used. The mixture designs that are most evident in the literature are the simplex centroid design, the simplex lattice design and the axial (augmented) design. The simplex lattice design was selected for this research as it is commonly used in, for example, the pharmaceutical industry, chemical industry and the food industry. None of these mixture designs has ever previously been applied to the field of mineral processing and the thesis aimed to establish the experimental mixture design as a foundation for a methodology to evaluate and interpret the effect of ore blends.The thesis involved the characterization of four pure ores. Laboratory milling and flotation tests were conducted in order to standardize a milling time and quantify the uncertainty around the test work. Laboratory batch milling tests were performed using a standard Yaskuwa 0.25 kW rod mill, and laboratory batch flotation tests were performed using a standard Denver laboratory flotation cell. The simplex lattice experimental mixture design was then used to generate design points where ore from the four sources were blended in specified proportions. Ten-ton bulk samples of each ore were collected and sub sampled. The material was crushed to -12 mm using a cone crusher and split 12 ways with a rotary bulk splitter. The subsamples from splitting were combined and resplit for homogenization. Material was then crushed to -3 mm using a jaw crusher and 40 kg of this material was split 8 ways with a rotary splitter to render 5 kg portions.Each 5 kg portion was split 10 ways using a rotary splitter to render 500 g portions, which were used to make up the experimental design points.Laboratory milling and flotation experiments were conducted on these ore blends for each design point. Different polynomial models were fitted to the design and the special cubic model was found to describe the data adequately. By evaluating the coefficient for binary and ternary terms, the polynomial model was then used to interpret antagonistic and synergistic interactions between the various ores. Binary and ternary plots were further used to visually interpret interactions. A was also accentuated by the significant synergistic interaction of the ternary terms containing both Paardekraal (x 3 ) and Townlands (x 4 ). It was found that the quality of ore as well as the relative proportion on the blend will affect grade. This model is therefore a useful tool to detect the effect of blending on cumulativ...

show abstract

Section: Types Of Millsmentioning

confidence: 99%

The effect of ore blends on the mineral processing of platinum ores

Tonder

Deglon

Napier-Munn

2010

Minerals Engineering

View full text Add to dashboard Cite

show abstract

“…The alternative studies of designing a semi-autogenous and/or autogenous mill have also been performed [15,17,[20][21][22][23][24].…”

Section: Tumbling Millmentioning

confidence: 99%

Autogenous Tumbling Media Assessment to Clean Weathered Surfaces of Waste-Rock Particles from a Basalt Quarry

Tufan

2015

Minerals

View full text Add to dashboard Cite

Abstract:In this study, the optimum feed composition in autogenous tumbling of basalt waste-rock particles to clean their weathered surface was determined. The weathered surfaces of basalt are generally cut out consequent to extraction of basalt columns in quarry operations. The inefficiently cut out portions of basalt cause formation of huge quarry waste dumps causing visual pollution on roadsides. Mixtures of different particle size fractions of basalt waste-rock particles were experimented to achieve the optimum feed material composition. The minimum loss of commercially available basalt particles and maximum clear surface was intended. The results were compared with respect to weight loss (%) and reflectance values of used and generated samples.

show abstract

“…The mass of grinding media inside the chamber is determined by a mass balance considering the ball replacement rate and the metal consumption rate; this latter parameter is proportional to the mass of mineral in the mill (Salazar et al, 2009):…”

Section: Grinding Media Bearing Pressure and Load Positionmentioning

confidence: 99%

“…SAG mills (see Figure 1) are presently one of the most widely used alternatives in the field of mineral size reduction as a result of their advantages such as higher processing capacity, lower physical space requirements, and lower investment and maintenance costs, as compared to conventional circuits (Salazar, et al, 2009). Due to the size of SAG mills, pilot plants are usually used for research purposes to improve the control strategies.…”

Section: Introductionmentioning

confidence: 99%