Catalogue of the Span Classsearchtermspan Classsearchtermcollections
Catalogue of the Span Classsearchtermspan Classsearchtermcollections
Science Museum Great Britain
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Lead liquated out of the zinc crust. This contains 55 oz. Of silver per ton, but should not contain more than 10 oz. See Percy's Metallurgy, Lead, p. 152. 1513. Portion of the zinc crust, after the lead has been liquated out of it. 1514. Zinc distilled from the liquated zinc, and cast in the form of a bar. 1515. The silver powder left as a residue, after the zinc has been distilled off. An earthy grey powder containing the silver. 1516. Slag from the run-down silver powder. It is massive, compa...ct, and cavernous. These are all (Nos. 1509-16) from the same process as carried on at the Llanelly Works in 1859. 1517. Zinc alloy taken from the lead in Parkes' process. This has been subsequently liquated to withdraw a portion of the lead. It now has the composition Silver - - - - - 3*13 Lead - 73 '42 Copper - 2-07 Arsenic - 3*49 Antimony - - - 0*19 Zinc - - - - 16-84 Iron - trace Insoluble residue - 25 99-39 Analysed and communicated by J. G. Hochstatter, at Par Smelting Works, Cornwall, 1870.
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