Dry Processing for Coal Preparation
R1500,00
Description
Related Products
Development of Design Procedures for Long Slender Pillars
2005
Design guidance for rib pillars, built from back analysed in situ coal tests and two dimensional modelling rather than empirical data, for rock engineers laying out high extraction panels.
What this report foundNumerical modelling produced upper and lower bound strength formulae for rib pillars, the lower bound covering weak roof and floor contacts.
R1500,00
Numerical modelling produced upper and lower bound strength formulae for rib pillars, the lower bound covering weak roof and floor contacts. The formulae apply between width to height ratios of 0.5 and 2.5, with linear interpolation below that, and give conservative designs above 3. Adjustments were suggested where regular joint sets occur.
Mapping of Old Bords and Pillars Revisited
2019
Desktop review of recent unmanned aerial and underwater vehicle systems and how they compare with borehole scanning, for engineers assessing the stability of old underground workings.
What this report foundMapping abandoned, inaccessible bord and pillar workings comes down to two options: borehole deployed laser or sonar scanning, or sensors carried in by...
R1500,00
Mapping abandoned, inaccessible bord and pillar workings comes down to two options: borehole deployed laser or sonar scanning, or sensors carried in by unmanned vehicles. Drone mounted laser scanning for air filled voids and sonar carried by small submersibles for flooded workings were judged the most promising, but intrinsic safety, deployment and the risk of losing equipment still favour borehole methods for occasional use.
Cleaning Near Moving Conveyors
2011
First phase of a two part investigation into conveyor cleaning practice at South African coal mines, covering the legal position, current mine practice and available machinery.
What this report foundConveyance legislation promulgated in 2008 and enforced soon after left the coal industry without a lawful way to clean near and under running conveyors.
R1500,00
Conveyance legislation promulgated in 2008 and enforced soon after left the coal industry without a lawful way to clean near and under running conveyors. The first phase defined the problem, recorded the cleaning practices mines already use successfully, and built a structured database of mechanised platform options worth pursuing. High risk areas remain drives, take ups, snub and tail pulleys and transfer points.