Method of preparing a solid mass for mercury recovery
First Claim
1. In a solid mercury recovery mass comprising a solid mineral aluminous dispersant or support, and copper and sulfur at least partly in the form of copper sulfide, the improvement comprising an improved long-term life of the recovery mass resulting from the production of the mass by the following stages:
- (a) incorporating at least one copper compound other than a sulfide into a solid mineral aluminous dispersant or support,(b) when said copper compound in step (a) is not a copper oxide, calcining the product obtained in stage (a) so as to convert at least in part the copper compound(s) which it contains into copper oxide (CuO and/or Cu2 O),(c) bringing the product obtained in stage (b) or in stage (a) when there has not been a stage (b) into contact with elemental sulfur, and(d) subjecting the product resulting from stage (c) to a heat treatment in a non-oxidizing atmosphere at a temperature and for a time sufficient to convert at least 80% of the copper to the sulfide state.
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Abstract
A solid mass for the recovery of mercury, comprising a solid mineral support or dispersant, essentially copper and sulphur at least partly in the form of copper sulfide is produced by the following stages:
a) at least one copper compound other than a sulphide is incorporated into a solid mineral dispersant or carrier,
b) the product obtained in stage (a) is calcined in order at least partly to convert the copper compound or compounds which it contains into copper oxide (CuO and/or Cu2 O),
c) the product obtained in stage (b) or in stage (a) if there has not been a stage (b) is brought into contact with elementary sulphur,
d) the product resulting from stage (c) referred to as the precursor, is subjected to a thermal treatment in a non-oxidizing atmosphere and accompanied by gas scavenging, to a temperature and for a sufficient time to allow the formation of sulphide of the metal(s) present.
94 Citations
19 Claims
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1. In a solid mercury recovery mass comprising a solid mineral aluminous dispersant or support, and copper and sulfur at least partly in the form of copper sulfide, the improvement comprising an improved long-term life of the recovery mass resulting from the production of the mass by the following stages:
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(a) incorporating at least one copper compound other than a sulfide into a solid mineral aluminous dispersant or support, (b) when said copper compound in step (a) is not a copper oxide, calcining the product obtained in stage (a) so as to convert at least in part the copper compound(s) which it contains into copper oxide (CuO and/or Cu2 O), (c) bringing the product obtained in stage (b) or in stage (a) when there has not been a stage (b) into contact with elemental sulfur, and (d) subjecting the product resulting from stage (c) to a heat treatment in a non-oxidizing atmosphere at a temperature and for a time sufficient to convert at least 80% of the copper to the sulfide state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification