Method for improving gypsum/phosphoric acid slurry filtration using carboxymethyl cellulose
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United States of America Patent
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May 22, 2012
Grant Date -
Jan 5, 2012
app pub date -
Jun 30, 2010
filing date -
Jun 30, 2010
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Abstract
A chemical process to improve the filtration performance for the removal of gypsum from phosphoric acid/gypsum slurry using a filtration aid that is selected from a class of polymers, lower molecular weight anionic polyelectrolytes, which previously have not been used for this application. The polymer is CMC or Carboxymethyl Cellulose, which is a polymerized cellulose ether. CMC is found to be extremely effective for phosphoric acid/gypsum slurry that was produced from igneous phosphate rock. CMC is also available in food grade, which is novel for filtration aids for the production of phosphoric acid which may be used for human or animal feed.
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