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

A lead sulfide and acid leaching technology, which is applied in the direction of process efficiency improvement, photographic technology, instruments, etc., can solve the problems of leaching agent corrosiveness, serious environmental pollution, and poor operating environment, so as to achieve low corrosiveness and avoid environmental pollution , the effect of meeting the requirements of environmental protection

Active Publication Date: 2018-08-14
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

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

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

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Effect test

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

Pb

S

Fe

Ag

Element / %

48.71

17.32

7.76

0.0057

[0050] Get 400g of lead sulfide concentrate (its chemical composition is shown in Table 1), add acidic leaching solution 2000mL, its chemical composition is: Pb 2+ 120g / L, the total concentration of iron ions is 0.15mol / L, and the concentration of free methanesulfonic acid is 0.3mol / L; and add 0.5g calcium lignosulfonate, in a cylindrical reactor with a diameter of 10cm, stir while stirring Oxygen is blown into the bottom of the paddle, the stirring speed is 350r / min, and the reaction is carried out at a temperature of 95°C for 20h until the pH value of the solution is 5.3 and the total concentration of iron ions is less than 5mg / L, then the neutral leachate and neutral leach residue are separated.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/16C22B13/00C25C1/18
CPCC22B3/165C22B13/04C25C1/18Y02P10/20
Inventor 杨声海王长红李为轮陈永明何静唐朝波杨建广
Owner CENT SOUTH UNIV
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