Method for leaching lead from lead sulfide concentrate by two-stage countercurrent atmospheric pressure oxidation with sulfonic acid solution

Abstract

The invention discloses a method for extracting lead from lead sulfide concentrate through two-stage countercurrent constant-pressure oxidizing leaching of a sulfonic acid solution. The method comprises the following steps of mixing the sulfonic acid solution with lead sulfide concentrate and a surfactant in a reaction kettle, adopting iron ions as an oxidation catalyst, and performing a two-stage countercurrent leaching method of neutral oxidizing leaching and acid oxidizing leaching under constant pressure to achieve selective leaching of lead; oxidizing sulfur in the concentrate into elemental sulfur which remains in slag; performing electrodeposition on a neutral leaching solution so as to obtain metal lead and a waste electrolyte; performing next acid leaching on the waste electrolyte or preparing an electrolyte from the waste electrolyte and a new solution; and enabling an acid leaching solution to enter the procedure of the next neutral leaching. Through the adoption of the method, not only can the efficient extraction of lead be realized, but also the cyclic utilization of the leaching solution and the electrolyte is realized, and waste solutions are not produced, so that green and environmental protection requirements are met.

Description

technical field

[0001] The invention relates to a method for extracting lead from lead sulfide concentrate by a full-wet method, in particular to a method for leaching lead in lead sulfide concentrate by two-stage countercurrent atmospheric pressure oxidation of sulfonic acid solution, which belongs to the field of nonferrous metal metallurgy. Background technique

[0002] Sulfonic acid solution exists stably in nature and is not easily oxidized and reduced. It is used as a raw material for medicine and pesticides, and can be used as a dehydrating agent, a paint curing accelerator, and a fiber treatment agent. In recent years, it has been widely used as a solvent for electric brush plating. Metal methanesulfonate is widely used in the field of electrochemical deposition, and the applications related to the surface finishing industry include: replacing fluoroboric acid and fluoroborate in tin, lead and tin-lead alloy electroplating; metal wire and steel bar plating Tin; meta...

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