Loading patent…
AssigneeAmax Inc.
InventorsEddie C. Chou, Ben W. Wiegers, Dale K. Huggins, Edward I. Wiewiorowski
Estimating the term…
A process is provided for removing hexavalent selenium from an acidic sulfate solution containing at least one metal ion from the group consisting of nickel, cobalt and copper at ambient pressure and at a temperature not exceeding the boiling point of the solution. The solution is treated with an agent from the group consisting of a compound which will produce nascent hydrogen in the solution and finely divided metal from the group consisting of nickel, cobalt and copper resulting from in situ precipitation of the metal in the acid sulfate solution. Thus, following treatment with the compound, the hexavalent selenium is reduced to a form separable from the solution by solid-liquid separation.
The process for removing hexavalent selenium from an acidic sulfate process solution containing the same and at least one metal ion from the group consisting of nickel, cobalt and copper at ambient pressure and at a temperature not exceeding the boiling point of said solution which comprises treating said solution with an effective amount of an agent from the group consisting of metal hydrides, metal borohydrides, ammonia borane, and their derivatives and finely divided metal from the group consisting of nickel, cobalt and copper resulting from in situ precipitation of said metal in an acid sulfate solution thereof upon treatment with said compound, to reduce said hexavalent selenium to a form separable from said solution by solid-liquid separation.
The process for removing hexavalent selenium from an aqueous acidic sulfate process solution containing the same and a metal ion from the group consisting of nickel, cobalt and copper which comprises treating said aqueous solution at ambient pressure and at a temperature not exceeding the solution boiling point with an effective amount of an agent selected from the group consisting of metal hydrides, metal borohydrides, ammonia borane, and their derivatives to reduce a portion of said metal ion to metal in situ to produce a high surface area metal powder, removing at least a portion of said reduced metal from said solution and contacting a further portion of said aqueous solution containing hexavalent selenium therewith to reduce said selenium to a form separable from said solution by solid-liquid separation.
The process for removing hexavalent selenium from an aqueous sulfate process solution containing the same and a metal ion from the group consisting of nickel, cobalt and copper which comprises introducing into said solution an effective amount up to about 8% by weight of said metal ion in solution of an agent selected from the group consisting of metal hydrides, metal borohydrides, ammonia borane, and their derivatives at atmospheric pressures and at temperatures not exceeding the solution boiling point to reduce a portion of said metal ion to metal in situ and to reduce at least a portion of said hexavalent selenium, and thereafter separating said reduced selenium from said solution by solids-liquids separation.
Dependencies are inferred from the claim text.