Saskatoon-Potash Corp. of Saskatchewan Inc. said July 26 that in the second quarter it signed a contract to build three 7,500 st silicon tetrafluoride (STF) plants at its Aurora, NC, phosphate facility. This follows the completed construction and commissioning of one 7,500 st plant in the first half. The cost of all four plants is approximately $130 million. STF is used in manufacturing silicon wafers for the growing solar energy market. PotashCorp says it is a stable, high-return industrial product made from hydrofluorosilicic acid recovered from the evaporators when P205 is produced.
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