Method for leaching germanium in zinc oxide smoke through ultrasonic enhancement

Abstract

The invention relates to a method for leaching germanium in zinc oxide smoke through ultrasonic reinforcement. The method comprises the following steps: adding the zinc oxide smoke dust into a leaching tank filled with a sulfuric acid solution, stirring and leaching for 1-5 minutes at the temperature of 50-80 DEG C to obtain a leaching system A, and monitoring the pH value of the system in the leaching tank through a pH meter in the leaching process; the leaching system A in the leaching tank is subjected to ultrasonic enhanced agitation leaching for 19-39 min through an ultrasonic vibration plate, and the pH value of the system in the leaching tank is monitored through a pH meter in the leaching process; after a pH meter monitors that the pH value of a system in the leaching tank is smaller than 3, a reducing agent is automatically added through a batching pump at the temperature of 50-80 DEG C, then ultrasonic enhanced reduction leaching is conducted for 5-15 min, solid-liquid separation is conducted to obtain leachate and leaching residues, germanium is extracted from the leachate, and the leaching residues are returned to a lead smelting system. According to the method, the germanium in the smoke dust can be efficiently extracted under the condition of low acid consumption, the leaching rate of the germanium reaches 93%, and accumulation of the germanium in a system is reduced.

Description

technical field [0001] The invention relates to a method for germanium leaching, in particular to a method for ultrasonically strengthening germanium leaching in zinc oxide fume. Background technique [0002] In my country, germanium is mainly recovered from the zinc oxide fume of the fuming furnace, and the wet leaching method is mainly used. During the leaching process, the iron in the dust will be leached out and oxidized to ferric iron. Although the acidity of the solution system is controlled above the acidity of iron hydrolysis during the leaching process of germanium, the generation of ferric iron consumes a certain amount of iron in the microscopic region. acid, the acidity of the solution decreases, resulting in the hydrolysis of part of the ferric iron, and the generated ferric hydroxide colloid adsorbs the complex anion HGeO of germanium in situ 3- and GeO 3 2- , co-precipitated by the formation of ferrogermanium polymer molecules, resulting in a decrease in th...

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Problems solved by technology

[0005] The present invention aims at the problem that the germanium leaching from the current flue dust is single-blade mechanical stirring leaching, the leaching kinetics of germanium is poor, and the partial hydrolysis of iron is serious, so that the extraction rate of germanium is low. Energy strengthens the mixing of germanium-containing dust and sulfuric acid to improve the kinetics of leaching and diffusion. At the same time, a pH meter is used to monitor the pH value of the solution in real time, and a reducing agent is added in time to prevent the formation of ferric hydroxide colloids and reduce the precipitation loss of germanium, so as to finally achieve germanium in the dust. efficient extraction of

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