A method for recovering silver from high-temperature high-acid zinc leaching slag
A zinc leaching slag, high temperature and high acid technology, applied in solid separation, flotation, etc., can solve the problems of less than 20% recovery rate, no industrial application, poor indicators, etc.
Active Publication Date: 2017-06-16
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology
However, for the silver in the leaching slag produced by the high-temperature high-acid zinc leaching method, there is no effective recovery method so far. The test index, the grade of silver concentrate is also lower than 700g / t, the recovery rate is less than 20%, the index is poor, and it has not been put into industrial application
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[0044] (1) Fast floating: After scrubbing the high-temperature high-acid zinc leaching slag, add regulator sodium hexametaphosphate dosage 600g / t, sodium sulfide dosage 2kg / t; ) under the chemical system of 800g / t, quickly float for one minute to obtain silver concentrate 1 (containing 2400g / t silver, recovery rate 5.8%), and the fast floating tailings enter the next step;
[0045] (2) Rough selection: After the fast floating tailings are scrubbed, the dosage of sodium hexametaphosphate is 300g / t, the dosage of sodium sulfide is 1kg / t; Roughing is carried out under the chemical system of / t, and roughing concentrate and roughing tailings are obtained;
[0046] (3) Sweeping (Sweeping 1): After the roughing tailings are scrubbed, the dosage of the adjusting agent sodium hexametaphosphate is 150g / t, the dosage of sodium sulfide is 500g / t; 1:1) Sweeping under the 200g / t chemical system to obtain middle ore;
[0047] (4) Beneficiation: the rough concentrate obtained in step (2) i...
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The invention discloses a method for recovering silver from high-temperature high-acid-content zinc leach residues. The method comprises the following steps: taking the high-temperature high-acid-content zinc leach residues as raw materials, taking sodium hexametaphosphate and sodium sulfide as regulating agents, taking aerofloat and diethyl dithiocarbamate as collecting agents, performing steps of segmental scrubbing, quick floatation, rough separation, scavenging, fine separation, re-scavenging and the like, and efficiently recovering silver. After in-depth study on material compositions of the high-temperature high-acid-content zinc leach residues, the invention discovers that silver is mainly dispersed in zinc blende and a powdery material covering the surface of the zinc blende, and for the discovery, the invention creatively researches and determines an optimal reagent system and proposes a recovery process for 'segmental scrubbing, quick floatation, rough separation, scavenging, fine separation of middlings and roughly separated concentrates, and re-scavenging'. According to the method, the comprehensive grade of total silver concentrates is 1,887.06 g / t and the total recovery rate is 64.54%; silver concentrates 1 contain 2,400 g / t of silver and the recovery rate is 5.8%; silver concentrates 2 contain 1,850 g / t of silver and the recovery rate is 58.74%.
Description
technical field [0001] The invention relates to a method for recovering silver from high-temperature high-acid zinc leaching slag. Background technique [0002] Since the end of the 1960s, the hydrometallurgy process has been widely used instead of pyrometallurgy. With the development of leaching technology, in order to further increase the leaching rate of zinc and recover other associated valuable elements, the conventional zinc leaching process has been developed into a high-temperature and high-acid zinc leaching process. The high-temperature high-acid zinc leaching process is to carry out zinc leaching under high-temperature and high-acid conditions, which can further decompose the zinc ferrite produced in the zinc concentrate leaching, so that the zinc leaching rate is increased from 87% to 89% of the conventional zinc leaching process to 97%~98%, greatly improving the zinc leaching rate, but the precious metals (gold, silver, etc.) contained in the zinc concentrate s...
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IPC IPC(8): B03D1/00
Inventor 黄万抚李新冬陈明安占涛王金敏张宏廷
Owner JIANGXI UNIV OF SCI & TECH