Method for extracting lead from lead sulfide ore concentrate by HCl-O2-NaCl system

A lead sulfide and concentrate technology, which is applied in the fields of chlorination leaching and wet leaching of lead, can solve the problems of high cost of lead sulfide concentrate and environmental pollution, and achieves low requirements for equipment anticorrosion, good working environment and low corrosiveness. Effect

Inactive Publication Date: 2010-01-06
SHENYANG RES INST OF NONFERROUS METALS +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the environmental pollution of the existing pyrotechnical treatment of lead sulfide concentrate and the high cost of processing low-grade lead sulfide concentrate, and aim at the problems existing in the leaching of lead sulfide concentrate by ferric chloride, a method is proposed A new method for chlorination leaching of lead sulfide concentrate

Method used

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  • Method for extracting lead from lead sulfide ore concentrate by HCl-O2-NaCl system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 500Kg of lead sulfide concentrate into the reaction tank according to the solid-liquid ratio = 1:4, and carry out the solid-phase conversion reaction under the action of copper ion catalyst, oxygen and hydrochloric acid, wherein the catalyst dosage is 1.25g / L, and the reaction temperature is 70 ℃, the pH value of the solution is 0.5~1, the oxygen flow rate is 200ml / min, the reaction time is 7h, the reaction is completed, the solution is cooled to room temperature and the solid-liquid separation is carried out, and the solid-phase conversion slag is placed in the solid-liquid ratio of 1:4 Sodium chloride leaching is carried out in the leaching tank, wherein the concentration of sodium chloride is 6mol / L, the leaching temperature is 90°C, and the leaching time is 4h. After the leaching reaction is completed, solid-liquid separation is carried out, and the leachate is cooled and crystallized to produce solid lead chloride.

[0018] Result: Lead leaching rate 98.58%

[...

Embodiment 2

[0023] Put 500Kg of lead sulfide concentrate into the reaction tank according to the solid-liquid ratio = 1:3, and carry out the solid-phase conversion reaction under the action of catalyst, oxygen and hydrochloric acid, wherein the catalyst dosage is 1.45g / L, and the reaction temperature is 70°C. The pH value of the solution is 0.5-1, the oxygen flow rate is 200ml / min, the reaction time is 6.5h, the reaction is completed, the solution is cooled to room temperature, and the solid-liquid separation is carried out, and the solid-phase conversion slag is leached according to the solid-liquid ratio of 1:4. Sodium chloride leaching is carried out in the tank, wherein the concentration of sodium chloride is 6mol / L, the leaching temperature is 95°C, and the leaching time is 4h. After the leaching reaction is completed, solid-liquid separation is carried out, and the leaching liquid is cooled and crystallized to produce solid lead chloride.

[0024] Result: Lead leaching rate 98.75%

...

Embodiment 3

[0029] Put 500Kg of lead sulfide concentrate into the reaction tank according to the solid-liquid ratio=1:4, and carry out the solid-phase conversion reaction under the action of catalyst, oxygen and hydrochloric acid, wherein the catalyst consumption is 1.35g / L, and the reaction temperature is 65°C. The pH value of the solution is 0.5-1, the oxygen flow rate is 200ml / min, the reaction time is 7h, and the reaction is completed. After the solution is cooled to room temperature, the solid-liquid separation is carried out, and the solid-phase conversion slag is placed in the leaching tank according to the solid-liquid ratio of 1:4. Sodium chloride leaching is carried out in the medium, the concentration of sodium chloride is 6mol / L, the leaching temperature is 93°C, and the leaching time is 4h. After the leaching reaction is completed, solid-liquid separation is carried out, and the leaching solution is cooled and crystallized to produce solid lead chloride.

[0030] Result: Lead ...

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Abstract

The invention relates to a method for producing rough lead by the direct low temperature melting of solid lead chloride. The method is characterized by comprising the following steps: (1) firstly, mixing solid lead chloride, fusing agent and reducing agent; (2) adding the mixture into a turning short kiln to carry out low-temperature smelting so as to produce rough lead, slag, flue dust and flue gas; (3) carrying out water leaching on the slag and the flue dust produced by the low-temperature smelting, producing leached slag and leached fluid by solid and fluid separation, keeping the leached slag to be processed, evaporating and concentrating the leached fluid and producing the solid lead chloride. The fusing agent used by the invention is calcium carbonate, and the reducing agent used by the invention is coke powder or coal powder. The invention has the characteristics of low production cost, energy consumption and flue dust rate, high efficiency and lead direct yield, less lead volatilizing content, and the like.

Description

technical field [0001] The invention relates to a method for leaching lead by wet method, in particular to a method using HCl-O 2 The invention relates to a chlorination leaching method for treating lead sulfide concentrate with NaCl system, which belongs to the field of wet lead smelting technology. Background technique [0002] With the development of the lead smelting industry, countries around the world have increasingly stringent requirements on the environmental protection of the pyrometallurgical lead smelting process, and the more polluting sintering roasting-reduction smelting traditional pyrometallurgical lead smelting process has been gradually banned. Although modern oxygen smelting processes such as Kivect, QSL, and SKS developed in recent years have solved the problem of SO 2 Flue gas acid production problem, but there are still the following deficiencies: first, can not completely eliminate SO 2 The pollution of flue gas and lead-containing smoke to the envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/10C22B13/00
CPCY02P10/20
Inventor 王德全李淑梅胡立念李辉杨钫刘金堂丛自范
Owner SHENYANG RES INST OF NONFERROUS METALS
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