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Leaching method for recovering lead from lead oxide ore and leaching agent used in leaching method

A technology of leaching agent and lead oxide, which is applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of poor selectivity, easy corrosion of equipment, and influence on leaching effect, and achieve simple operation, low process cost, and elimination of environmental pollution Effect

Inactive Publication Date: 2015-03-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Traditional inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid and other strong acids have disadvantages such as poor selectivity in the leaching process, difficulty in purifying the leachate, and easy corrosion of equipment; when acid leaching ores containing a large amount of alkaline gangue minerals such as calcium and magnesium, the substances are easy to deteriorate the leaching environment and affect the leaching effect

Method used

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Examples

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Embodiment 1

[0023] An embodiment of the present invention provides a leaching agent for recovering lead from oxidized lead ore. The leaching agent is prepared by uniformly mixing trichloroacetic acid and water. The concentration of trichloroacetic acid is 0.2mol / L. Under the condition that the leaching temperature is 25°C, the weight of the particle size is less than 60 μm accounts for 85%, the mass liquid-solid ratio of trichloroacetic acid leaching agent and lead oxide ore powder is 20:1, and the leaching rate of lead is about 87.2% after fully stirring for 30 minutes. %.

Embodiment 2

[0025] An embodiment of the present invention provides a leaching agent for recovering lead from oxidized lead ore. The leaching agent is prepared by uniformly mixing trichloroacetic acid and water. The concentration of trichloroacetic acid is 0.4mol / L. Under the conditions that the leaching temperature is 40°C, the weight of the particle size is less than 60 μm accounts for 80%, the mass liquid-solid ratio of trichloroacetic acid leaching agent and lead oxide ore powder is 15:1, and the leaching rate of lead is about 92.1% after fully stirring for 50 minutes. %.

Embodiment 3

[0027] The embodiment of the invention provides a leaching method for recovering lead from lead oxide ore. The method specifically includes: crushing and grinding the lead oxide ore, and the weight percentage of the ore with a particle size of less than 60 μm is 70%; adding trichloroacetic acid solution with a concentration of 0.25 mol / L and lead oxide ore powder according to the mass liquid Mix with a solid ratio of 20:1, stir thoroughly for 24 minutes, and control the leaching temperature within 35°C; obtain a lead-containing solution suitable for the next step of extraction and electrowinning. The lead leaching rate is 93.6%.

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Abstract

The invention belongs to the technical field of mineral metallurgy and particularly relates to a leaching method for recovering lead from lead oxide ore and a leaching agent used in the leaching method. The leaching method comprises the following steps: by mainly using organic acid trichloroacetic acid as the leaching agent, leaching lead from the lead oxide ore at the leaching temperature of 20 DEG C-60 DEG C, wherein the ore having a particle size being less than 60mu m accounts for 70wt%-90wt% and the liquid-solid mass ratio of leaching agent trichloroacetic acid to lead oxide ore powder is (5-20) to 1; and fully stirring for 25 minutes-65 minutes to obtain a lead-containing solution suitable for next lead extraction and electrodeposition treatment. The leaching rate of the used leaching agent is high, the trichloroacetic acid waste generated in pharmaceutical and chemical industries can be utilized; in addition, under the condition of ensuring a high leaching rate of lead, the leaching method does not need high-temperature pressurizing device and is simple to operate and low in process cost.

Description

technical field [0001] The invention belongs to the technical field of mineral metallurgy, and in particular relates to a leaching method for recovering lead from lead oxide ore and a leaching agent thereof. Background technique [0002] Lead is an important non-ferrous metal. With the increasing demand for lead metal worldwide, primary lead ore is facing multiple pressures such as shortage of reserves and serious pollution in the dressing and smelting process. In nature, the industrial minerals that can be used to recover lead include lead sulfide minerals and oxide minerals. The lead sulfide minerals are mainly galena (PbS), and the lead oxide minerals are mainly white plumbite (PbCO 3 ). Lead sulfide minerals have good floatability, and concentrates can be easily obtained by flotation. As the resources of high-grade lead sulfide ore are decreasing, lead oxide ore has become an important resource for lead recovery. [0003] Compared with lead sulfide minerals, oxide min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/16C25C1/18
CPCY02P10/20
Inventor 邓久帅吴丹丹文书明毛莹博丰奇成王伊杰吕超陈瑜贾陆和
Owner KUNMING UNIV OF SCI & TECH
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