Frictional Ignitions Potentials Map for South African Coal Mines
R1500,00
Description
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Unlocking obstacles to the commercialisation of eutectic freeze crystallisation
2022
Laboratory crystallisation cell tests on copper, brass, stainless steel and aluminium cooling plates in sodium sulphate solution, aimed at replacing mechanical scraping in brine treatment plants.
What this report foundHeat exchanger material governs how fast ice scale forms during eutectic freeze crystallisation of dilute brine.
R1500,00
Heat exchanger material governs how fast ice scale forms during eutectic freeze crystallisation of dilute brine. Induction time fell as thermal conductivity rose, so copper scaled first, while aluminium gave the lowest scaling rate because its low surface energy pushed ice crystallisation into the bulk. Stainless steel delayed onset but scaled heavily once nucleation started.
Review of Current and Expected Underground Coal Mining Methods and an Evaluation of the Best Practices Associated with These
2010
Review of underground coal production systems in South Africa set against practice in Australia, China and the United States, with guidance on equipment choice and section planning.
What this report foundSouth African underground sections average about 60 000 t a month, against 130 000 to 160 000 t for single pass bolter miner units on continuous haulage, while...
R1500,00
South African underground sections average about 60 000 t a month, against 130 000 to 160 000 t for single pass bolter miner units on continuous haulage, while the better sections target 1.4 to 1.6 Mt a year. Australian longwalls deliver 5 to 7 Mt a year from one face, compared with 3 to 5 Mt at the two local wall operations.
Collation of Historic Thermal Imagery
2008
Pilot exercise pulling scattered thermal survey datasets held by companies and research bodies into one mapping system, with a view to tracking coal fires and mine water discharge.
What this report foundExisting thermal imagery of the Witbank coalfield was traced to its holders and assessed for format, quality, resolution and coverage, then brought into one...
R1500,00
Existing thermal imagery of the Witbank coalfield was traced to its holders and assessed for format, quality, resolution and coverage, then brought into one geographic information system with supporting metadata. Satellite thermal bands give a regional picture only; detailed mapping of coal fires or acid drainage discharge needs high resolution aerial surveys.