Process for Controlled Homogeneous Acid Leaching
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United States of America Patent
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Issued Date -
Jun 2, 2011
app pub date -
Jul 29, 2009
filing date -
Jul 29, 2008
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Abstract
A method for leaching a material containing one or more target metals using an acidic leaching solution to extract said one or more target metals, said method including (I) empirically determining an optimal acid concentration range for said acidic leaching solution by: (a) determining the relationship between the concentration of extracted target metal/s and acid consumption in said leaching solution, (b) utilizing said relationship to evaluate value parameters for the target metal containing material as a function of said acid consumption, and (c) determining said optimal acid concentration range, which is the pH range corresponding to an optimal value parameter; and (II) controlling the concentration of said acidic leaching solution such that its pH is substantially within the optimal acid concentration range throughout said material.
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