Search Results - "Ngonidzashe Chimwani"

Editorial for Special Issue “Comminution and Comminution Circuits Optimisation” by Ngonidzashe Chimwani

“…Comminution is the size reduction of rock particles from blasting during the mining stage to crushing and milling during the mineral processing stage [...]…”
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A Review of the Milestones Reached by the Attainable Region Optimisation Technique in Particle Size Reduction by Ngonidzashe Chimwani

“…The attainable region (AR) is an optimization method adopted for use in comminution to achieve different objective functions, which all converge to optimising…”
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A Review of the Grinding Media in Ball Mills for Mineral Processing by Nyasha Matsanga, Willie Nheta, Ngonidzashe Chimwani

“…The ball mill is a rotating cylindrical vessel with grinding media inside, which is responsible for breaking the ore particles. Grinding media play an…”
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Accessing Metals from Low-Grade Ores and the Environmental Impact Considerations: A Review of the Perspectives of Conventional versus Bioleaching Strategies by Rosina Nkuna, Grace N. Ijoma, Tonderayi S. Matambo, Ngonidzashe Chimwani

“…Mining has advanced primarily through the use of two strategies: pyrometallurgy and hydrometallurgy. Both have been used successfully to extract valuable…”
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Using Discrete Element Method to Analyse the Drop Ball Test by Ngonidzashe Chimwani, Murray Mulenga Bwalya, Oliver Shwarzkopf Samukute

“…The drop ball test (DBT) is a common quality control procedure used in many grinding media manufacturing units to evaluate the quality of manufactured balls…”
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Exploring the End-Liner Forces Using DEM Software by Ngonidzashe Chimwani, Murray M. Bwalya

“…The main roles of liners are to protect the mill shell and promote effective ball motion for grinding. For this reason the liner profile is carefully selected…”
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Numerical Simulation of a Single and Double-Rotor Impact Crusher Using Discrete Element Method by Murray M. Bwalya, Ngonidzashe Chimwani

“…The Discrete element method (DEM) is an invaluable tool for studying comminution as it provides detailed information that can help with process analysis as…”
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Development of a More Descriptive Particle Breakage Probability Model by Murray M. Bwalya, Ngonidzashe Chimwani

“…Single-particle breakage test is becoming increasingly popular, as researchers seek to understand fracture response that is purely a function of the material…”
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Milling Studies in an Impact Crusher I: Kinetics Modelling Based on Population Balance Modelling by Ngonidzashe Chimwani, Murray M. Bwalya

“…A number of experiments were conducted on a laboratory batch impact crusher to investigate the effects of particle size and impeller speed on grinding rate and…”
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The impact and challenges of sustainable biogas implementation: moving towards a bio-based economy by Muvhiiwa, Ralph, Hildebrandt, Diane, Chimwani, Ngonidzashe, Ngubevana, Lwazi, Matambo, Tonderayi

“…Background Engineers face increasing pressure to manage and utilize waste (whether of animal, human or municipal origin) in a sustainable way. We suggest that…”
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Using Process Mineralogy as a Tool to Investigate Blending Potential of the Pentlandite-Bearing Ores at the Nkomati Ni Mine in South Africa by Thomas Dzvinamurungu, Derek Hugh Rose, Ngonidzashe Chimwani, Fanus Viljoen

“…The mineralogy and texture of Ni-sulfide ores at the Nkomati nickel mine are highly variable, and this results in often erratic nickel recovery at the mine…”
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Determination of the milling parameters of a platinum group minerals ore to optimize product size distribution for flotation purposes by Chimwani, Ngonidzashe, Glasser, David, Hildebrandt, Diane, Metzger, Mathew J., Mulenga, François K.

“…[Display omitted] ► Milling parameters of the PGM ore are measured and others back-calculated. ► Simulated and measured product size distributions were…”
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Scale-up of batch grinding data for simulation of industrial milling of platinum group minerals ore by Chimwani, Ngonidzashe, Mulenga, François K., Hildebrandt, Diane, Glasser, David, Bwalya, Murray M.

“…[Display omitted] •Milling parameters of a UG2 ore were measured in the laboratory.•The milling parameters were scaled-up to industrial mill using empirical…”
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Using DEM to investigate how shell liner can induce ball segregation in a ball mill by Chimwani, Ngonidzashe, Bwalya, Murray M.

“…[Display omitted] •The load behaviour of three lifter profiles were simulated.•Their power draw and energy impacts were assessed.•The lifter profiles were then…”
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Modeling of an open mill with scalped feed for the maximum production of a desired particle size range by Chimwani, Ngonidzashe, Hildebrandt, Diane

“…Milling circuits play an important role in achieving the desired product; tonnage, size distribution, and properties, since they are directly linked to the…”
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Tailoring ball mill feed size distribution for the production of a size-graded product by Chimwani, Ngonidzashe, Mohale, Thapelo M., Bwalya, Murray M.

“…[Display omitted] •Milling parameters for gold ore were measured and validated.•They were used to simulate breakage patterns of different feeds.•Effect of…”
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Introduction to the use of the attainable region method in determining the optimal residence time of a ball mill by Mulenga, François K., Chimwani, Ngonidzashe

“…The application of the attainable region (AR) technique to the analysis of ball milling is currently limited to batch data. This paper introduces the use of…”
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Ball size distribution for the maximum production of a narrowly-sized mill product by Chimwani, Ngonidzashe, Mulenga, François K., Hildebrandt, Diane

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Use of the attainable region method to simulate a full-scale ball mill with a realistic transport model by Chimwani, Ngonidzashe, Mulenga, François K., Hildebrandt, Diane, Glasser, David, Bwalya, Murray M.

“…•The attainable region technique was applied to optimise residence time and energy.•The optimisation was expanded from simple to tanks-in-series transport…”
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