Normalization: Normalization performed when the attribute data are scaled up o scaled down. Example: Data should fall in the range to postnormalization. Attribute construction: these attributes are constructed and included the given set of attributes helpful for data mining.. The result of this process is a final data set that can be used in modeling.
The next step in the extraction of zinc is called Roasting. The concentrated ore is finely ground into small pieces and then suspended in a rising stream of air. The sulphur content can be reduced hugely with this process. This also converts the Zinc Blende to ZnO which is way more reactive.