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John Armstrong
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Publication of GB189816312ApublicationCriticalpatent/GB189816312A/en
16,312. Armstrong, J. July 26. Lead; zinc; metals, precious. - Relates to improvements on the process described in Specification No. 22,361, A.D. 1896, for reducing complex ores containing lead and zinc. The improvements consist (a) in the avoidance of the use of lime as a flux by employing ores devoid of silica, or by previously removing the gangue by any well-known means, (b) in the addition of lead in sufficient quantity to carry down the gold, silver, and other precious metals that may be contained in the ore. (c) in the preliminary fine grinding of the ore, (d) in the roasting or weathering of the slag. and its subsequent lixiviation to obtain alkali salts in solution, and final distillation to obtain the zinc in the usual manner. The Specification also states that the process depends on the production of nascent alkali metal, and may be carried out by means of such metal produced in other ways.
GB189816312D1898-07-261898-07-26Improvements in or appertaining to the Smelting of Complex Sulphide Ores containing Zinc and Lead.
ExpiredGB189816312A
(en)
Method for extracting metals from concentrated sulphurated minerals containing metals by direct reduction with regeneration and recycling of the reducing agent, iron, and of the flux, sodium carbonate