Method and apparatus for extracting copper/tin source material from oxalate of copper and/or tin

A method for extracting a copper/tin source material from an oxalate of copper and/or tin, comprising following steps:

• (1) treating the oxalate of copper and/or tin using at least one of following approaches:
• approach 1:
• allowing cupric oxalate and/or stannous oxalate to undergo a chemical reaction with a hypochlorite in a hypochlorite-containing aqueous solution to produce a copper compound-containing and/or tin compound-containing precipitate, which is accompanied by release of carbon dioxide;
• and
• approach 2:
• allowing the cupric oxalate and/or the stannous oxalate to undergo a chemical reaction in a solution comprising an alkaline substance to produce a copper compound-containing and/or tin compound-containing precipitate, wherein the alkaline substance comprises a potassium-containing alkaline substance;
• and
• (2) subjecting a solid-liquid mixture produced after the chemical reaction in the step (1) to solid-liquid separation to produce a filter residue A and a filtrate B, wherein the filter residue A is the copper compound-containing and/or tin compound-containing precipitate.