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Method for recovery of zinc by ultrasonic neutral leaching of zinc oxide flue dust

A zinc oxide and ultrasonic technology, applied in the field of hydrometallurgy, can solve the problems of increasing the production process and production cost, and achieve the effects of shortening the leaching time, increasing the recovery rate, and improving the recycling rate

Active Publication Date: 2014-11-05
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The patent application (patent application number is 201310117398) uses ultrasonic radiation to generate huge energy in the liquid and can cause "cavitation". The recovery of zinc in zinc fume leaching slag through ultrasonic enhanced leaching has achieved good results, but the zinc Further leaching of smoke and dust leaching slag will undoubtedly increase the production process and production cost, and in this application, the leaching reaction temperature is 55-85°C, and the leaching temperature is still high

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  • Method for recovery of zinc by ultrasonic neutral leaching of zinc oxide flue dust

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Experimental program
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Effect test

Embodiment 1

[0022] like figure 1 As shown, the ultrasonic neutral leaching of zinc oxide fume to recover zinc, the specific steps are as follows: first, the zinc oxide fume is added into the raffinate at a temperature of 35 ° C according to the liquid-solid ratio of 5:1, and the stirring speed is under ultrasonic conditions. 100rpm for neutral leaching for 40min, until the final pH value is 4.08. After the end, the leaching residue and zinc leaching solution are obtained. The zinc leaching solution enters the impurity removal process, and the leaching residue is ready for the next step of leaching.

[0023] Among them, the zinc oxide dust includes the following components in mass percentage: 34.79% zinc, 10.06% lead, 12.29% iron, 0.045% scattered metal indium, and 3% silicon dioxide content. Zinc oxide and iron indium acid are mainly used in zinc oxide dust Zinc exists in the form; the raffinate comes from the indium extraction process in the hydrometallurgy process of a zinc smelter, inc...

Embodiment 2

[0026] like figure 1 As shown, the ultrasonic neutral leaching zinc oxide soot recovery zinc method, its specific steps are as follows: first the zinc oxide soot according to the liquid-solid ratio is 10:1 to add the temperature is 30 ℃ raffinate under ultrasonic conditions, the stirring speed is Neutral leaching was performed at 600rpm for 90min until the final pH value was 4.13. After leaching, leaching slag and zinc leaching solution were obtained. The zinc leaching solution entered the impurity removal process, and the leaching slag was ready for the next step of leaching.

[0027] Among them, the zinc oxide dust includes the following components in mass percentage: 34.79% zinc, 10.06% lead, 12.29% iron, 0.045% scattered metal indium, and 3% silicon dioxide content. Zinc oxide and iron indium acid are mainly used in zinc oxide dust Zinc exists in the form; the raffinate comes from the indium extraction process in the hydrometallurgy process of a zinc smelter, including the...

Embodiment 3

[0030] like figure 1 As shown, the ultrasonic neutral leaching zinc oxide soot recovery zinc method, its specific steps are as follows: first the zinc oxide soot according to the liquid-solid ratio is 20:1 into the raffinate at a temperature of 35 ° C under ultrasonic conditions, the stirring speed is Neutral leaching at 400 rpm for 20 minutes until the final pH value is 4.30. After leaching, leach slag and zinc leaching solution are obtained. The zinc leaching solution enters the impurity removal process, and the leaching residue is ready for the next step of leaching.

[0031] Among them, the zinc oxide dust includes the following components in mass percentage: 34.79% zinc, 10.06% lead, 12.29% iron, 0.045% scattered metal indium, and 3% silicon dioxide content. Zinc oxide and iron indium acid are mainly used in zinc oxide dust Zinc exists in the form; the raffinate comes from the indium extraction process in the hydrometallurgy process of a zinc smelter, including the follow...

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Abstract

Belonging to the technical field of hydrometallurgy, the invention relates to a method for recovery of zinc by ultrasonic neutral leaching of zinc oxide flue dust. The method includes: firstly adding the zinc oxide flue dust into a raffinate at 30DEG C-40DEG C according to a liquid-solid ratio of 5-25:1, conducting neutral leaching at a stirring speed of 100-600rpm for 10-100min under ultrasonic conditions so as to obtain leaching residue and a zinc leaching solution at the end of leaching, subjecting the zinc leaching solution to an impurity removal process, and getting the leaching residue ready for next step leaching. According to the method, ultrasonic wave is employed to reinforce neutral leaching of the zinc oxide flue dust directly, and the ultrasonic cavitation effect is employed to generate intense impact and high speed micro-jet erosion to a reactant surface so as to accelerate the leaching reaction, improve the leaching rate of zinc and increase recycle of secondary resources.

Description

technical field [0001] The invention relates to a method for recovering zinc by ultrasonically neutrally leaching zinc oxide smoke and dust, and belongs to the technical field of hydrometallurgy. Background technique [0002] Zinc has a wide range of uses and plays an important role in the national economy. With the rapid development of my country's economy, zinc concentrate resources are becoming increasingly scarce, and the use of zinc secondary resources is becoming more and more extensive. Zinc oxide dust is an important secondary zinc resource, mainly from the smelting of zinc, lead and copper, galvanized scrap steel, steel dust and so on. Zinc oxide dust has a wide range of sources and complex components. It contains zinc, lead, indium and other valuable metals, and has a high recovery value. As the grade of ore available for mining in the world continues to decline, the comprehensive utilization of resources is becoming more and more urgent. Many zinc smelting enter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30C22B7/02
CPCY02P10/20
Inventor 彭金辉郑雪梅李静张利波郭文倩马爱元叶乾旭
Owner KUNMING UNIV OF SCI & TECH
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