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Method for recovering zinc from high iron and high lead leaching residue through microwave-ultrasonic wave combination

An ultrasonic and leaching slag technology, applied in microwave and ultrasonic applications, to achieve efficient recovery, shorten leaching time, and avoid local sintering

Active Publication Date: 2013-10-16
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems and deficiencies existing in the existing production process, the present invention proposes a process method of microwave reduction roasting combined with ultrasonic enhanced leaching, using zinc fume leaching slag as a raw material, first undergoing microwave carbon reduction roasting to destroy the zinc ferrite structure, which reduces the conditions required for subsequent leaching, and then uses the mechanical effect produced by ultrasonic cavitation to strip the lead sulfate on the surface of the acid leaching particles, thereby greatly improving the recovery rate of zinc. This method is not only for zinc smelting Zinc ferrite and lead sulfate existing in the process proposed a microwave carbon reduction and ultrasonic enhanced leaching process, and reduced the environmental pollution caused by the accumulation of a large amount of leaching slag

Method used

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  • Method for recovering zinc from high iron and high lead leaching residue through microwave-ultrasonic wave combination
  • Method for recovering zinc from high iron and high lead leaching residue through microwave-ultrasonic wave combination

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) Take 250g of boiler dust high-iron and high-lead leaching slag from a metallurgical plant in Yunnan, containing 12.34% zinc, 20.85% iron, 12.20% lead, 6.12% silicon dioxide, and 1091.9g / t indium, of which the main metal substances are ZnFe 2 o 4 , PbSO 4 ,Such as figure 2 shown. Then add 1% carbon powder by mass, mix well, heat to 600°C by microwave, keep the temperature for 2 hours, then stop heating, and pass N 2 Protect the atmosphere to prevent the oxidation of ferric oxide until the temperature drops below 100°C to obtain leached slag after reduction;

[0021] (2) Add the leached slag after reduction obtained in step (1), and add a sulfuric acid solution with a concentration of 150g / L at a liquid-solid ratio (L / Kg) of 8:1, and then irradiate the mixed solution with ultrasonic waves at 75°C Intensive leaching for 3 hours, the conditions of ultrasonic radiation are: the ultrasonic frequency is 20KHz, the ultrasonic power distributed per liter of mixed liqui...

Embodiment 2

[0023] (1) Take 250g of high-iron and high-lead leaching slag, add carbon powder with 5% of its mass, mix well, heat to 800°C by microwave, keep the temperature for 1 hour, then stop heating, and pass in N 2 Protect the atmosphere to prevent the oxidation of ferric oxide until the temperature drops below 100°C to obtain leached slag after reduction;

[0024] (2) Add the leached slag after reduction obtained in step (1), and add a sulfuric acid solution with a concentration of 70g / L at a liquid-solid ratio of 5:1. The conditions of irradiation are: the ultrasonic frequency is 22KHz, the ultrasonic power distributed per liter of mixed liquid is 100W, the leaching liquid is obtained through solid-liquid separation, and then the leaching liquid is subsequently purified, and metal zinc is recovered through electrowinning. The recovery rate of zinc reaches 95%, and the leaching rate of iron is 39%.

Embodiment 3

[0026] (1) Take 250g of high-iron and high-lead leaching slag, add 7% of its mass carbon powder, mix well, heat to 550°C by microwave, keep the temperature for 3 hours, then stop heating, and pass in N 2 Protect the atmosphere to prevent the oxidation of ferric oxide until the temperature drops below 100°C to obtain leached slag after reduction;

[0027] (2) Add the leached slag after reduction obtained in step (1), and add a sulfuric acid solution with a concentration of 170g / L at a liquid-solid ratio of 3:1. The conditions of irradiation are: ultrasonic frequency is 25KHz, the ultrasonic power distributed per liter of mixed liquid is 160W, leachate is obtained through solid-liquid separation, and the leachate is subsequently purified, and metal zinc is recovered through electrowinning. The recovery rate of zinc reaches 97%, and the leaching rate of iron is 40%.

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Abstract

The invention provides a method for recovering zinc from high iron and high lead leaching residue through microwave-ultrasonic wave combination, and belongs to the technical field of microwave and ultrasonic wave applications. The method comprises: taking high iron and high lead leaching residue, adding carbon powder, uniformly mixing, carrying out microwave heating to a temperature of 550-950 DEG C, carrying out constant temperature maintaining for 1-3 h, stopping heating, introducing a N2 protection atmosphere, cooling to a temperature of less than 100 DEG C to obtain after-reduction leaching residue, adding the after-reduction leaching residue to an acid liquid, carrying out ultrasonic wave radiation on the mixed solution at a temperature of 45-85 DEG C to carry out enhancement leaching, carrying out solid-liquid separation to obtain a leaching solution, carrying out subsequent purification on the leaching solution, and recovering metal zinc through electrowinning. Compared to the conventional hot acid leaching, the method of the present invention has the following characteristics that: a leaching time is significantly shortened, a leaching acidity and a leaching temperature are reduced, and 90-98% of zinc can be recovered. With the present invention, the difficult problem of low recovery rate of the high lead and high iron system is overcome, the process is simple, the treatment effect is good, zinc and other valuable metals can be efficiently recovered, and problems of environmental pollution and resource waste caused by stockpiling of a lot of abandoned residue are solved.

Description

technical field [0001] The invention provides a method for recovering zinc from high-iron and high-lead leaching slag by using microwave roasting combined with ultrasonic enhanced leaching, which belongs to the technical field of microwave and ultrasonic applications. Background technique [0002] Zinc has a wide range of uses and plays an important role in the national economy. Zinc has a low melting point, good melt fluidity, and good corrosion resistance. It is mainly used in the galvanizing industry and is often used as a protective layer for steel, such as Galvanized sheet pipe fittings, etc., account for 50% of the world's zinc consumption. my country is the world's largest producer of zinc, and 8-15% of iron is often associated with domestic zinc mines. The current conventional smelting process of zinc plants: roasting-leaching-electrodeposition, in the conventional process of roasting, iron inevitably oxidizes with zinc in the calcine to form zinc ferrite. Due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/04C22B19/30
CPCY02P10/20
Inventor 巨少华王欣彭金辉杨大锦张利波
Owner KUNMING UNIV OF SCI & TECH
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