Back to results
US 4,070,260 AGranted
Process of sulfuric acid leaching silicated zinc ores
AssigneeCompagnie Royale Asturienne des Mines
InventorNoel Dreulle
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeCompagnie Royale Asturienne des Mines
InventorNoel Dreulle
Estimating the term…
A process of leaching silicated zinc ores with sulfuric acid in which the ore is reacted at elevated temperature with at least a stoichiometric amount of sulfuric acid, treating products of the reaction with a predetermined quantity of hot water, filtering the zinc sulfate solution from precipitated silica, washing with a further predetermined quantity of hot water (the total amount of hot water used being determined so as to obtain the desired concentration of zinc in solution). The zinc is later recovered electrolytically. A 1 to 6N sulfuric acid solution may be used in which case a gelatinous mass is formed upon reaction and then it is evaporated at 100.degree. C of at least 60% of its water content. Alternatively the ore can be malaxated with about 20% stoichiometric excess concentrated sulfuric acid, and filtered at out at elevated temperature.
A process of leaching silicated zinc ore with sulfuric acid comprising the steps of reacting silicated zinc ore with at least a stoichiometric amount of a 1N to 6N sulfuric acid solution near its boiling point until a gelatinous mass is formed containing hydrated silica and zinc sulfate, evaporating at least 60% of the water content of the gelatinous mass so that substantially all the silica crystallizes, treating the evaporated mass with hot water in a quantity effective to dissolve substantially all the zinc sulfate, filtering the crystallized silica from the zinc sulfate solution, and recovering the zinc sulfate solution for subsequent electrolytic extraction of zinc.
A process of leaching silicated zinc ore with sulfuric acid comprising reacting the silicated zinc ore with at least a stoichiometric amount of concentrated sulfuric acid by malaxing the ore and acid to produce zinc sulfate, treating the products of the reaction with a predetermined quantity of water near its boiling point sufficient that the concentration of recovered zinc is about 150 g/l, filtering at elevated temperature the zinc sulfate solution, and recovering the zinc sulfate solution of a concentration of about 150 g/l zinc for subsequent electrolytic extraction of zinc.
Dependencies are inferred from the claim text.