This new regulation clarifies a long-standing policy position of WorkCover WA that GST is not to be deducted from injured workersâ entitlements. Information to this effect was communicated to stakeholders in 2000, prior to the introduction of GST.
Chemical grade limestone is important to the process as it is the primary raw material which helps remove impurities from the iron ore and produces a slag with low melting point and a high fluidity. Consistency of the chemical grade limestone for chemistry and sizing is critical for efficient blast furnace operations and cost control.
  Limestone is weathered physically by freeze thaw action and also by chemical weathering e.g rainwater. Rainwater absorbs carbon dioxide to form a carbonic acid which rea â¦ cts with the limetsone (calcium carbonate) to form a bicarbonate which dissolves limestone.7 people found this useful. Limestone is weathered physically by freeze thaw action and also by chemical weathering e.g rainwater. Rainwater absorbs carbon dioxide to form a carbonic acid which rea â¦ cts with the limetsone (calcium carbonate) to form a bicarbonate which dissolves limestone. 7 people found this useful.