C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 30/02 (2006.01) C01G 30/00 (2006.01)
Patent
CA 2147249
An antimony recovery process is disclosed in which antimony- containing material is leached in a solvent including elemental sulfur and a caustic to preferentially leach antimony. The antimony-contain- ing leach liquor from the leaching step is separated from the insoluble residue by filtration, and the antimony compounds in the separated leach liquor are crystallized to separate the antimony compounds from impurities which are left in solution in the leach liquor. The crystals are then redissolved and treated to create marketable anti- mony products of high purity, such as antimony metal, sodium hy- droxy antimonate, sodium antimonate, antimony pentoxide, and anti- mony pentasulfide. Alternatively, the crystallized antimony com- pounds comprising primarily sodium thioantimonate crystals may be recovered and sold without further treatment. Waste products may be treated with soluble iron compounds and lime to render the waste products safe for disposal. Additionally, feed material having a high weight ratio of soluble arsenic to soluble antimony may be pretreated, if desired, to improve the purity of the recovered antimony products and to remove the arsenic for further treatment or disposal.
Anderson Corby G.
Krys Leo Ernest
Nordwick Suzzann Marie
Gowling Lafleur Henderson Llp
Sunshine Mining Company
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