Method for production of high purity copper sulfate
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United States of America Patent
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Apr 10, 2012
Grant Date -
Feb 10, 2011
app pub date -
Oct 21, 2010
filing date -
Sep 5, 2002
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Abstract
High purity copper sulfate having a purity of 99.99% or higher and in which the content of transition metals such as Fe, Cr, Ni is 3 wtppm or less is provided. A method for producing such high purity copper sulfate includes the steps of dissolving copper sulfate crystals in purified water, performing evaporative concentration thereto, removing the crystals precipitated initially, performing further evaporative concentration to effect crystallization, and subjecting this to filtration to obtain high purity copper sulfate. This manufacturing method of high purity copper sulfate allows the efficient removal of impurities from commercially available copper sulfate crystals at a low cost through dissolution with purified water and thermal concentration.
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