AST's State of the Art Technology: uses new high tech wet-screen technology to produce high quality rock and washed sand products.
Sustainably Washed Sand: Our technology recycles 90% of the water used to wash the sand, ensuring that ASTs sales conform to the highest possible environmental standards.
Van Dykspruit Mine: is located close to Cullinan, Van Dykspruit mine is now open and producing: High Quality -5mm +75µ washed “River Silica” (Less than 3% sub 75micron)
Secondary products include: -10 + 8mm dry screened sand, G5 and Run of Mine products.
The modular design of this washing system ensures highly accurate separation of silts and clays from mined material. This results in the production of high quality sand products that command the highest possible commercial value.
There is an increased shortage of water. AST’s technology offers operators a proven way to increase the efficiency of sand washing operations while at the same time maintaining the highest levels of product quality.
The waste-water treatment process, reduces the volume of fresh water to feed the washing plant by over 90%, a step that meant the plant requires only 22m³ of fresh water/hour. Without the addition of the AquaCycle thickener the figure would be 220m³/hour – a HUGE reduction in water usage, being controlled, and confined to a much smaller plant and mining operation “footprint.”
Methodology: Samples were split into two aliquots and pulverised. One aliquot was micronized and analysed by XRD using the Panalytical X’pert Pro diffractometer which employs Co-Ka radiation. The second aliquot was also analysed by XRD and then glycolated and reanalysed, and heat treated and reanalysed (to identify swelling clays and distinguishing phases such as chlorite. Data was interpreted by Panalytical Highscore Plus software with the PanICSD database.
Results: The results of the XRD analyses are displayed in the graph (Right) and shows the diffractograms obtained in the analysis. The mineral quartz is the main constituent of all four samples.