Method for jarosite precipitation and deironization by pressure acid leaching of high-iron zinc-sulphide concentrate in kettle

A zinc sulfide concentrate and autoclave technology, applied in the direction of improving process efficiency, can solve the problems of lower zinc recovery rate, large waste of resources, cumbersome operation, etc., reduce energy consumption and metal zinc loss, and reduce production Cost, shortening the effect of the process

Active Publication Date: 2009-12-02
云南永昌铅锌股份有限公司
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Problems solved by technology

It can be seen that the above-mentioned process has the disadvantages of long process, cumbersome 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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Embodiment Construction

[0013] 1. Raw materials

[0014] The high-iron zinc sulfide concentrate is taken from a dressing plant, and its composition and weight percentages are: Zn43.7%, Fe28.67%, S28.29%, and the high-iron zinc sulfide concentrate is ground to more than 95% and passed through a -400 mesh sieve;

[0015] 2. Zinc acid leaching

[0016] Use dilute sulfuric acid with a concentration of 1.3-1.7mol / L to leach zinc. The high-iron zinc sulfide concentrate and zinc oxide ore are mixed at a ratio of 23:1 by weight and then pumped into the autoclave. The ratio of liquid to solid in the autoclave is 5:1. The total amount is 240 grams. The leaching conditions are: the temperature in the kettle is 150±5°C, the stirring speed is 500r / min, the leaching time is 120min, and the pressure in the kettle is 1.2Mpa. The added amount of the surfactant lignin is 0.2% by weight of the high-iron zinc sulfide concentrate, and under this condition, the leaching rate of zinc is 98.23%. The final acid concentrat...

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Abstract

The invention discloses a method for jarosite precipitation and deironization by pressure acid leaching of high-iron zinc-sulphide concentrate in a kettle, which comprises the following steps: conveying the high-iron zinc-sulphide concentration and zinc oxide ore in a mixing ratio of 23:1 into an autoclave; in the zinc leaching process, controlling the acidity to convert most of iron into a slag phase; converting a solid phase of a small amount of leached iron into a water phase in leachate; making the leachate enter an adjusting tank, and adding low-grade zinc oxide ore or zinc precipitation residue for neutralization to make the iron generate hydrolytic precipitation and become the slag phase; and discharging the iron along slag through filter pressing, and performing purification treatment on generated qualified supernatant directly. Because the deironization is carried out in the kettle, the method has the advantages of short flow, simple and convenient operation, low treatment cost, high deironization rate, low zinc content in the slag, high zinc recovery rate and the like. The zinc leaching reaches over 98 percent, and the Fe contained in the leachate is less than or equal to 20 mg / l.

Description

technical field [0001] The invention relates to a wet zinc smelting technology, in particular to a method for removing iron by submerging alum in a pressurized acid leaching kettle for high-iron zinc sulfide concentrate. Background technique [0002] For the treatment of materials such as high-iron zinc sulfide concentrate, the pressurized acid leaching process is currently used. During the zinc leaching process, about 30% of the iron is leached. ——It can only be removed by sinking alum to remove iron. It can be seen that the above-mentioned process has the disadvantages of long process, cumbersome 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 purpose of the present invention is to provide a high-iron sulfide zinc concentrate pressure acid leaching kettle for iron removal by submerging alum. During the pressure acid leaching process o...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B19/02
CPCY02P10/20
Inventor 杨洪枝张安福何光深吴建存匡志恩杨绍富姜自林田仁宿
Owner 云南永昌铅锌股份有限公司
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