||Chemistry in Action
Chemistry in action. ^A785725
||Mining Limestone (4:53) -- Processing Limestone (4:27) -- Calcium Oxide: Quicklime (4:34) -- Calcium Hydroxide: Slaked Lime (2:28) -- Making Cement Powder (2:29)
||Limestone, or calcium carbonate-made of the skeletons of billions of sea creatures-is mined in large quantities. Carefully blasted out of the ground, it is first crushed with huge pestles to eliminate large boulders, then passed through a series of sieves to separate large chunks for further crushing. When sufficiently small, it is washed to remove clay, dust, and sand. The grades are separated: some for road-building, others for processing into sodium carbonate for glass-making. The sand from the wash is separated out and can be made into quicklime and subsequently into slacked lime; the remainder is processed to make cement powder.
|General note||Encoded with permission for digital streaming by Films Media Group on Feb. 21, 2007.|
|General note||Films on Demand is distributed by Films Media Group for Films for the Humanities & Sciences, Cambridge Educational, Meridian Education, and Shopware.|
|Access restriction||Access requires authentication through Films on Demand.|
|Interest grade level
||11 & up.
|Technical details||Mode of access: Internet.|
|Technical details||System requirements: FOD playback platform.|
|Source of description||Title from distributor's description.|
|Issued in other form||Originally produced: Granada Media (Firm), 1987 9780736561402|
|Publisher number||1277 Films Media Group|
|Publisher number||1362s Films Media Group|