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Two-stage counter current oxidative pressure leaching method for lead in lead sulfide concentrate with sulfonic acid solution

A lead sulfide and acid leaching technology, which is applied in the field of non-ferrous metal metallurgy, can solve the problems of serious environmental pollution, high corrosiveness of leaching agents, poor operating environment, etc., and achieve the effects of avoiding environmental pollution, low corrosion, and meeting environmental protection requirements

Active Publication Date: 2017-06-13
CENT SOUTH UNIV
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Problems solved by technology

[0018] Aiming at the problems of serious environmental pollution, high corrosiveness of the leaching agent, and poor operating environment in the existing pyrochemical lead smelting and wet lead extraction methods, the purpose of the present invention is to propose a green and efficient all-wet method Method for extracting lead from lead sulfide concentrate

Method used

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  • Two-stage counter current oxidative pressure leaching method for lead in lead sulfide concentrate with sulfonic acid solution

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Embodiment 1

[0047] The chemical composition of the lead sulfide concentrate used in the test is shown in Table 1.

[0048] Table 1 Chemical composition of lead sulfide concentrate

[0049] element PbS Fe Ag ingredient / % 48.7117.327.760.0057

[0050] Take 250g of lead sulfide concentrate (its chemical composition is shown in Table 1), add 1200mL of acid leaching solution, its chemical composition is: Pb 2+ 110g / L, the total iron ion concentration is 0.21mol / L, the free methanesulfonic acid concentration is 0.4mol / L; and 0.5g calcium lignosulfonate is added, the inner bladder of the 2000mL autoclave is polytetrafluoroethylene, the stirring speed is 550r / min, oxygen is supplied to maintain a pressure of 0.6MPa, and the reaction is carried out at a temperature of 130°C for 2.5 hours until the pH value of the solution is 5.3, and the total iron ion concentration is less than 4mg / L, then the neutral leachate and the neutral leach residue are separated.

[0051] Add 1200mL waste electrowinning li...

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Abstract

The invention discloses a two-stage counter current oxidative pressure leaching method for lead in lead sulfide concentrate with a sulfonic acid solution. According to the method, the sulfonic acid solution is mixed with the lead sulfide concentrate and a surfactant, then the mixture reacts in an autoclave, iron ions are adopted to serve as an oxidation catalyst, and selective leaching of lead is realized with a two-stage counter current leaching method including neutral oxygen pressure leaching and acid oxygen pressure leaching; sulfur in the concentrate is oxidized into element sulfur and remains in slag. A neutral leaching agent is subjected to electrodeposition and metal lead and a waste electrolyte are obtained; the waste electrolyte is used for acid leaching next time or used for preparing a new electrolyte. With the adoption of the method, efficient extraction of the lead is realized, recycling of the leaching liquor and the electrolyte is realized, no waste liquor is produced, and the method meets the requirement for environment protection.

Description

Technical field [0001] The invention relates to a method for extracting lead from a lead sulfide concentrate by a total wet method, in particular to a method for leaching lead from a lead sulfide concentrate by two-stage countercurrent pressure oxidation with a sulfonic acid solution, belonging to the field of non-ferrous metal metallurgy. Background technique [0002] The sulfonic acid solution exists stably in nature and is not easy to be oxidized and reduced. Sulfonic acid has many uses. It is a raw material for medicine and pesticides. It can be used as a dehydrating agent, paint curing accelerator, and fiber treatment agent. In recent years, it has been widely used as a solvent for brush plating solutions. Metal methane sulfonates are widely used in the field of electrochemical deposition. Among them, the applications related to the surface finishing industry include: replacing fluoroboric acid and fluoroborates in tin, lead and tin-lead alloy plating; metal wire and steel s...

Claims

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Application Information

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IPC IPC(8): C22B3/16C25C1/18C22B11/00C01B17/06
CPCC01B17/06C22B3/165C22B11/04C25C1/18Y02P10/20
Inventor 杨声海李为轮王长红陈永明何静唐朝波杨建广
Owner CENT SOUTH UNIV
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