Process for stabilization of arsenic
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United States of America Patent
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Jun 9, 1998
Grant Date -
N/A
app pub date -
Feb 27, 1996
filing date -
Feb 27, 1996
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Abstract
The present invention is a method to remove arsenic from arsenic-containing materials, such as an ore or concentrate, by roasting the arsenic-containing material to convert arsenic sulfides into arsenic oxides. The arsenic oxides are contained in the roasted arsenic-containing material. The roasted arsenic-containing material is contacted with a lixiviant to solubilize the arsenic in the oxide in a pregnant leach solution. Ferric arsenate, an environmentally stable compound, is formed in the lixiviant. The ferric arsenate can be removed to provide a treated solution complying with environmental regulations. The method provides a simple and effective technique for removing arsenic from arsenic-containing materials.
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