UREA GRANULATION PROCESS
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United States of America Patent
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Oct 14, 2021
app pub date -
Jun 28, 2019
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Jul 12, 2018
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Abstract
A process of granulation of a urea melt, comprising: adding a first additive containing carboxymethyl starch to one or more first stage(s) of the granulation process, to form a carboxymethyl starch containing inner layer of urea granules, and adding a second additive containing calcium lignosulfonate to one or more second stage(s) of the granulation process, downstream said first stages, to form granules with a coating containing calcium lignosulfonate.
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