METHOD FOR REMOVING ARSENIC IN CONCENTRATE FOR NON-FERROUS METAL SMELTING AND CONCENTRATE FOR NON-FERROUS METAL SMELTING OBTAINED BY THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for removing arsenic in a concentrate for non-ferrous metal smelting by which the arsenic concentration (arsenic grade) in the concentrate can be reduced into a low concentration of≤0.5 mass% from several mass% by using a new pretreatment technique employing a wet smelting technique as a technique for removing the arsenic from the concentrate having high arsenic concentration and thus, the concentrate is obtained which can be smelted as usual by the smelting, and to provide the concentrate for non-ferrous metal smelting obtained by the method.

SOLUTION: The method for removing the arsenic in the concentrate for non-ferrous metal smelting includes: a pulp-slurry production process in which the pulp-slurry having 500-2,000 g/L pulp concentration is produced from the concentrate for non-ferrous smelting containing the arsenic; and a leaching process in which the arsenic is leached from the concentrate by adding 60-200 g NaHS and 50-200 g NaOH to the pulp-slurry 1 L.

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