Arsenic salt purified cobalt slag seed crystal, and purification method and application thereof

The invention provides a purification method of arsenic salt purified cobalt slag seed crystal, the arsenic salt purified cobalt slag seed crystal purified by the method and application of the purified seed crystal to the purification of solution of zinc sulfate during wet zinc smelting. The purification method comprises the following steps of: pulping the arsenic salt purified cobalt slag seed crystal to obtain seed crystal pulp; mixing acid and the seed crystal pulp; and performing solid-liquid separation. The purification method can effectively improve the activity of the arsenic salt purified cobalt slag seed crystal produced in the wet zinc smelting process, is easy to operate, reduces production cost, is environmentally-friendly, finally improves the quality of an arsenic salt purified product and has obvious economic benefit, and waste residue, waste gas and waste water are not generated.