Coaltech Research Association

The impact of cattle grazing on rehabilitated land

Two annual surveys of species composition, biomass and soil sampling inside and outside fenced plots on rehabilitated pasture at an opencast colliery near Ogies, with benchmark sites for comparison.

ND Thovhakale, EM Stam / July 2019

What this report found

Grazing pressure on the rehabilitated block ran at roughly three times the estimated carrying capacity. The sward was dominated by low quality grasses with a high proportion of bare ground and a raised erosion risk. Fenced exclosures over one year changed the abundance of a few species, but the vegetation showed no clear direction of recovery.

R1500,00

Description

Related Products

BCI Chemical Research & Analysis – Eutectic Freeze Crystallisation

Jacques Magliolo

2012

Desktop market and technology review of brine from coal related waste, covering global and South African demand, plant energy use and laboratory crystalliser results, for water treatment planners.

What this report foundEutectic freeze crystallisation was compared with evaporative crystallisation as a route for treating hypersaline mine brine.

R1500,00

R1500,00

Jacques Magliolo

What this report found

Eutectic freeze crystallisation was compared with evaporative crystallisation as a route for treating hypersaline mine brine. Optimised commercial evaporative crystallisers use 40 to 50 kWh per cubic metre of feed. Laboratory work measured a eutectic temperature of -21.1 degrees Celsius for pure sodium chloride solution, and found that a large difference between coolant and solution caused scaling on the heat exchanger wall.

Treatment of Sulphate Rich Effluents with the Combined Electrolytic/Biological Process

2003

Laboratory work on producing hydrogen by electrolysis as the energy source for sulphate reducing bacteria, aimed at cutting the running cost of treating sulphate rich mine water.

What this report foundHydrogen for biological sulphate removal can be generated on site by electrolysis more cheaply than it can be bought.

R1500,00

R1500,00

What this report found

Hydrogen for biological sulphate removal can be generated on site by electrolysis more cheaply than it can be bought. Stainless steel electrodes in acid mine drainage gave hydrogen at about a third of the bought in price while oxidising ferrous iron to ferric, which helps downstream treatment. Iron and zinc electrodes dissolved too quickly to be viable.

Spontaneous Combustion of Coal and Coal-shales

2018

Laboratory testing of samples from South African collieries using two Wits self-heating indices alongside proximate and ultimate analysis, for ventilation and safety engineers assessing burning shale risk.

What this report foundTesting of 28 coal and coal-shale samples showed the coals to be more liable to spontaneous combustion than the shales, though reactive coal-shales still...

R1500,00

R1500,00

What this report found

Testing of 28 coal and coal-shale samples showed the coals to be more liable to spontaneous combustion than the shales, though reactive coal-shales still self-heat and pyrite in them speeds the process. Higher carbon, moisture, hydrogen, volatile matter and nitrogen with lower ash all raised proneness to self-heating, so proximate and ultimate analysis can serve as a screening tool.

Shopping Basket