Application of Earth ion Exchange Technology for Conversion of Ro Brine From Tutuka/new Denmark Into Saleable Products
Pilot trial on single stage reverse osmosis brine at a Mpumalanga power station treating acid drainage from a neighbouring colliery, with projections for the planned second stage.
Ion exchange converted reverse osmosis brine from a power station treating colliery water and cooling tower blowdown into fertiliser and explosives salts, with no liquid effluent left to dispose of. Part of the water rejected by the reverse osmosis stage was also recovered as potable water. Brine is currently used for dust suppression and stored underground.
R1500,00
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Transformation of the Coal Mining Procurement Supply Chain
2004
Review of preferential procurement and small supplier development at South African coal producers, based on interviews with procurement staff, suppliers and accreditation agencies, with recommendations for management.
What this report foundThree modes of intervention were found in coal company procurement: preferential procurement rules, segmentation of goods and services by suitability for...
R1500,00
Three modes of intervention were found in coal company procurement: preferential procurement rules, segmentation of goods and services by suitability for transformation, and support programmes for small suppliers. Progress stalled where supplier development was handled by staff carrying other duties, since work not tied to production loses time and has no target. The remedy proposed is procurement targets linked down through commercial and production management.
Develop Methods to Prevent and Control Spontaneous Combustion Associated With Mining and Subsidence
2003
Fourth year of work at South African collieries, using borehole and infrared temperature monitoring, moisture testing and sealing trials, with control measures for opencast and underground operations.
What this report foundNo standard technique for predicting, controlling or extinguishing spontaneous combustion emerged, and the methods in use proved expensive and not routinely...
R1500,00
No standard technique for predicting, controlling or extinguishing spontaneous combustion emerged, and the methods in use proved expensive and not routinely successful. Because every mine differs, the work sets out a sequence of locating the fire, assessing the risk, choosing a strategy and method, then monitoring it. Separate control measures are given for old workings, exposed coal and spoil heaps.
Development of Seam-Specific Strength Formulae for South African Collieries
2006
Statistical back analysis of an expanded collapse database, testing power, linear and non-linear strength models, for rock engineers setting pillar safety factors.
What this report foundBack analysis of 77 collapsed and 245 uncollapsed pillar cases showed that much of the scatter in pillar strength comes from differences between coalfields, so...
R1500,00
Back analysis of 77 collapsed and 245 uncollapsed pillar cases showed that much of the scatter in pillar strength comes from differences between coalfields, so a single national formula is unrealistic. Seam specific formulae were derived for the major coalfields; Free State and KwaZulu Natal data remained too sparse. The lognormal safety factor distribution was retained.