Abstract: An alloy comprising more than 0.01% of gallium and more than 0.01% of indium added to zinc which is usable, as conventional zinc dust or zinc can, for the electrode of a dry cell and shows a high hydrogen overvoltage and evolves less hydrogen gas during storage of the cell.

Abstract: In a generally elongated reaction tube at an elevated temperature, a reducing gas stream is caused to flow along the axis of the reaction tube and a metal-halide gas stream diluted with an inert carrier gas is caused to flow in the same direction as but at a different velocity relative to the reducing gas stream. The two gas streams contact each other in a laminar manner and form an unstable interface region therebetween wherein the metal halide gas is reduced to form fine metal particles with uniform particle size.

Abstract: Zinc is advantageously recovered by mixing a zinc-containing material with a bituminous coal etc. to form briquettes, dry distilling the said briquettes to form coked lumps and electrothermically distilling the said coked lumps in an electrothermic distillation furnace.

Abstract: Indium is recovered effectively from an aqueous leached solution containing indium ions, together with other ions such as ferric ions, zinc ions, etc. if any, by adjusting the pH of the aqueous solution to 0.25-4.5, extracting the indium ions from the aqueous solution with an organic solvent solution formed by diluting an extraction reagent containing a monoalkylphosphoric acid and/or a dialkylphosphoric acid and a trialkylphosphoric acid in 1:2-5 by volume ratio with a phase-stabilizing water-immiscible organic solvent and then back-extracting the indium ions in the organic solvent solution with an aqueous sulfuric acid solution.