Method and apparatus for sequencing-batch purification of potassium nitrate from solid waste produced by glass-strengthening process
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United States of America Patent
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Feb 17, 2015
Grant Date -
Dec 5, 2013
app pub date -
Jan 17, 2013
filing date -
Jun 4, 2012
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Abstract
Provided is a method and an apparatus for purifying potassium nitrate from the solid waste produced by a chemical glass-strengthening process. In the method, the solid waste is melted into a liquid waste at first. Potassium nitrate of various purity grades can be obtained by batch processing the liquid waste through stepwise cooling processes of cooling the liquid waste to a first temperature facilitating the potassium nitrate contained in the liquid waste to be crystallized at a first rate and then cooling the liquid waste to a second temperature close to the freezing point of the potassium nitrate at a second rate that is slower than the first rate. The recovered potassium nitrate from the solid waste can be recycled and reused.
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