Recovery of zinc from lead slag
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United States of America Patent
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May 29, 2018
Issued Date -
N/A
app pub date -
Aug 6, 2013
filing date -
Aug 7, 2012
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Abstract
A method for recovering zinc from slag derived from lead smelting comprises subjecting the slag to a leaching step under conditions in which zinc is dissolved into solution and silica present in the slag dissolves and re-precipitates in a form that is readily separable from liquid, and recovering zinc from the solution. The slag may be subjected to leaching in at least two stages in which in a first leaching stage only part of the zinc is removed from the slag and further zinc leaching from the slag occurs in a second stage to form a pregnant leaching solution and recovering zinc from the solution. The method may be used to remove SO2 from a gas stream by using the SO2-containing gas stream to leach a slurry of the slag.
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