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Ultrasonic wave-hydrogen peroxide enhanced zinc oxide smoke dust leaching method

A zinc oxide and ultrasonic technology, applied in the field of hydrometallurgy, can solve the problems of environmental pollution, waste of resources, etc., and achieve the effects of high comprehensive recovery rate, consumption saving and simple process flow

Pending Publication Date: 2021-08-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the significant increase in demand for zinc and germanium in the market and the shortage of germanium resources, if the zinc leaching slag is not used effectively, it will not only cause waste of resources, but also seriously pollute the environment

Method used

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  • Ultrasonic wave-hydrogen peroxide enhanced zinc oxide smoke dust leaching method
  • Ultrasonic wave-hydrogen peroxide enhanced zinc oxide smoke dust leaching method
  • Ultrasonic wave-hydrogen peroxide enhanced zinc oxide smoke dust leaching method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Mix 30% hydrogen peroxide and 98% sulfuric acid at a mass ratio of 0.30:1 to obtain a mixed leaching agent with a sulfuric acid concentration of 160g / L. Zinc oxide dust is mixed with the mixed leaching agent at a liquid-solid mass ratio of 5:1. (Based on 30% concentration of hydrogen peroxide, the following examples are the same) and the ratio of zinc oxide dust is 0.2mL / g. After mixing, ultrasonic oxidation leaching was carried out at 200W ultrasonic power and 19.5KHz ultrasonic frequency. The leaching reaction was carried out at a temperature of 90°C and a stirring speed of 400rpm for 60 minutes. After the reaction was completed, the leachate and leaching residue were obtained by liquid-solid separation. The leaching rates of zinc and germanium were 91.46% and 82.66% respectively.

Embodiment 2

[0039] Mix 30% hydrogen peroxide and sulfuric acid at a ratio of 0.62:1 to obtain a mixed leaching agent with a sulfuric acid concentration of 160g / L. Zinc oxide dust is mixed with the mixed leaching agent at a liquid-solid mass ratio of 6:1. The ratio is 0.49 mL / g. After mixing, ultrasonic oxidation leaching was carried out at 400W ultrasonic power and 25KHz ultrasonic frequency. The leaching reaction was carried out at a temperature of 90°C and a stirring speed of 200rpm for 60 minutes. After the reaction was completed, the leachate and leaching residue were obtained by liquid-solid separation. The leaching rates of zinc and germanium were 96.33% and 84.23% respectively.

Embodiment 3

[0042] Embodiment 3 (best embodiment)

[0043] Mix 30% hydrogen peroxide and sulfuric acid at a mass ratio of 0.52:1 to obtain a mixed leaching agent with a sulfuric acid concentration of 160g / L. Zinc oxide dust is mixed with the mixed leaching agent at a liquid-solid mass ratio of 7:1. The amount of hydrogen peroxide and zinc oxide The ratio of smoke to dust was 0.49 mL / g. After mixing, ultrasonic oxidation leaching was carried out at 200W ultrasonic power and 25KHZ ultrasonic frequency. The leaching reaction was carried out at a temperature of 60°C and a stirring speed of 400rpm for 60 minutes. After the reaction was completed, the leachate and leaching residue were obtained by liquid-solid separation. The leaching rates of zinc and germanium are 99.61% and 88.29% respectively.

[0044] In this example, the ratio of 30% hydrogen peroxide and sulfuric acid is 0.52:1, and the ratio of 30% hydrogen peroxide and zinc oxide dust is 0.49mL / g. The oxidation of hydrogen peroxide an...

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Abstract

The invention relates to an ultrasonic wave-hydrogen peroxide enhanced zinc oxide smoke dust leaching method, and belongs to the technical field of wet smelting. The ultrasonic wave-hydrogen peroxide enhanced zinc oxide smoke dust leaching method mainly comprises four steps of preparation of a mixed leaching agent, control of a liquid-solid mass ratio, ultrasonic oxidation leaching and filtration. The ultrasonic technology and the hydrogen peroxide serving as a strong oxidant are introduced into the process for leaching zinc and germanium from the zinc oxide smoke dust, on the one hand, the hydrogen peroxide is uniformly dispersed in a solution by utilizing the ultrasonic technology, the particle size of the smoke dust is reduced, the contact area of the hydrogen peroxide and the zinc oxide smoke dust is increased, and the oxidation efficiency and the reaction rate are improved; and on the other hand, hydrogen peroxide is accelerated to be cracked to generate an oxidizing ion hydroxyl radical-OH which is stronger than hydrogen peroxide by utilizing the cavitation effect and the chemical effect of ultrasonic waves, the thermal effect of the hydrogen peroxide enables the temperature of a reaction medium to rise, so that the decomposition rate of H2O2 is accelerated, and the purposes of saving the dosage of hydrogen peroxide, improving the reaction rate and oxidizing and decomposing sulfide are achieved, so that the leaching rate of zinc and germanium is further improved.

Description

technical field [0001] The invention belongs to the technical field of wet smelting, and in particular relates to an ultrasonic-hydrogen peroxide enhanced method for leaching zinc oxide smoke and dust. Background technique [0002] The most typical process for extracting zinc from zinc sulfide concentrate is the roasting-leaching-electrowinning process. In the neutral leaching and weak acid leaching stages, ZnS and zinc ferrite are difficult to be leached effectively, and germanium is basically not leached, and almost all of them are enriched into zinc. leaching slag, so industrial germanium extraction must first consider the enrichment of germanium. Reduction and volatilization method is currently widely used zinc leaching slag germanium enrichment process, this method enriches zinc and germanium in zinc oxide fumes. [0003] During the reduction blowing of the fuming furnace, most of the ZnS in the zinc leaching slag is reduced to zinc powder, and the zinc powder is oxidi...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B19/30C22B41/00C22B19/20
CPCC22B7/02C22B7/007C22B19/22C22B19/30C22B41/00Y02P10/20
Inventor 夏洪应辛椿福张利波蒋桂玉蔡无尘张奇
Owner KUNMING UNIV OF SCI & TECH
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