Method for producing middle supernatant solution by carrying out two-step pressure acid leaching on high-iron zinc sulfide concentrate

A zinc sulfide concentrate and pressure leaching technology, applied in the direction of improving process efficiency, etc., can solve the problems of lower zinc recovery rate, complicated operation, high processing cost, etc., and achieve the effect of small slag production and easy filtration

Active Publication Date: 2012-05-23
云南永昌铅锌股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the above-mentioned process has the disadvantages of long process, complicated operation and high treatment cost, especially the leached zinc is lost to iron slag, which reduces the recovery rate of zinc and wastes resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] 1. Raw materials

[0015] The high-iron zinc sulfide concentrate is selected from a factory, and its composition and weight percentage are: Zn 43.7%, Fe 28.67%, S 28.29%.

[0016] 2. Zinc acid leaching

[0017] One-stage pressure leaching: the fresh high-iron zinc sulfide concentrate with a ball mill fineness of -400 mesh accounting for more than 95% is mixed with the slag produced in the second stage, and the total amount of 240 grams is added to the slurry tank for slurry mixing. After mixing evenly, Add 0.48 g of surfactant lignin, continue stirring and mixing, and then pump the pre-prepared dilute sulfuric acid with a concentration of 1.3 to 1.7 mol / L into the autoclave at the same time by two pumps to control the liquid in the autoclave. The solid ratio is 5:1, turn on the power of the control cabinet, heat the autoclave, and stir at a speed of 500r / min, when the temperature in the autoclave reaches 130°C, turn off the power, and feed industrial pure oxygen with a...

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PUM

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Abstract

The invention discloses a method for producing a middle supernatant by carrying out two-step pressure acid leaching on high-iron zinc sulfide concentrate, comprising the following steps: one-step pressure acid leaching: mixing and matching the high-iron zinc sulfide concentrate and the leached residue generated in the two-step pressure acid leaching; adding into a size mixing groove for mixing size; adding a proper amount of surfactant lignin; pumping the surfactant lignin and dilute sulphuric acid into a pressurizing kettle; controlling the temperature of the kettle; introducing industrial pure oxygen into the pressurizing kettle; controlling the pressure of the kettle; controlling the final concentration of the sulfuric acid to be 0.2-0.36mol / L in an ore pulp after the one-step pressureleaching; and filter pressing to obtain a supernatant as leaching agent of the two-step pressure leaching; two-step pressure acid leaching: pumping the high-iron zinc sulfide concentrate and the surfactant obtained in the one-step pressure acid leaching into the pressurizing kettle; controlling the temperature, introducing the industrial pure oxygen into the pressurizing kettle; controlling the pressure; and controlling the final pH value to be 4.8-5.2 in the ore pulp after the two-step pressure acid leaching to obtain middle supernatant of which the leachate contains more than or equal to 20mg / l of Fe for follow-up purifying and removing impurities, and the obtained leaching residue is returned to the one-step pressure acid leaching procedure.

Description

technical field [0001] The invention belongs to the technical field of wet zinc smelting of high-iron zinc sulfide concentrates, and in particular relates to a method for producing a supernatant solution from high-iron zinc sulfide concentrates through two-stage pressurized acid leaching. Background technique [0002] For the treatment of materials such as "high-iron zinc sulfide concentrate", a two-stage pressurized acid leaching process is currently used. During the zinc leaching process, the leachate still contains 1 to 2 g / l of Fe. Fe in the leaching solution produced by the second-stage pressure acid leaching is removed by pre-neutralization. It can be seen that the above-mentioned process has the disadvantages of long process, complicated operation and high treatment cost, especially the leached zinc is lost to iron slag, which reduces the recovery rate of zinc and wastes resources. Contents of the invention [0003] The object of the present invention is to provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/22C22B19/00
CPCY02P10/20
Inventor 王吉坤何光深朱国邦吴建存钱建波刘本鸣匡志恩杨国强汤绍鹏何文
Owner 云南永昌铅锌股份有限公司
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