Method of comprehensively recycling valuable metal from lead sulfate slag
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A valuable metal, lead sulfate technology, applied in the improvement of process efficiency, photographic technology, instruments and other directions, can solve the problems of low crystal quality, low lead crystallization rate, narrow use of lead chloride, etc. Low investment, equipment and simple effect
Active Publication Date: 2016-08-31
UNIV OF SCI & TECH BEIJING +1
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In this type of method, lead leached by chloride is usually produced in the form of crystallization or precipitation. The crystallization method has the disadvantages of low lead crystallization rate, low crystal quality, and narrow use of lead chloride. At the same time, a large amount of chlorine is taken away by the crystallization of lead. ions, and new...
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Embodiment 1
[0029] Stirring mill enhanced leaching: 1kg lead sulfate slag (Pb 28.1%, Cu 4.1%, Zn 3.6%, In 350g / t, Ag 760g / t), leaching agent is 200g / L sulfuric acid, leaching temperature 90℃, leaching time 2h, The liquid-solid ratio is 2:1. The copper leaching rate reaches 95%, the zinc leaching rate reaches 98%, and the indium leaching rate reaches 85%.
[0030] Neutralization: Neutralize the pH of the copper-zinc-indium solution to 1.0 with zinc oxide at room temperature (25°C).
[0031] One replacement: Zinc powder was used as the replacement agent, the replacement temperature was 25°C, the amount of zinc powder was 1.1 times the theoretical amount, and the replacement was performed for 1 hour to obtain 46.3 g of copper slag with a copper content of 83.7%.
[0032] Secondary replacement: Zinc powder was used as the replacement agent, the replacement temperature was 25°C, the amount of zinc powder was 2.5 times the theoretical amount, and the replacement was performed for 2 hours to ob...
Embodiment 2
[0037] Stirring mill enhanced leaching: 1kg lead sulfate slag (Pb 24.3%, Cu 5.3%, Zn 4.6%, In 310g / t, Ag 650g / t), leaching agent is 100g / L sulfuric acid, leaching temperature 70℃, leaching time 2h, The liquid-solid ratio is 2:1. The copper leaching rate reaches 95%, the zinc leaching rate reaches 97%, and the indium leaching rate reaches 84%.
[0038] Neutralization: Neutralize the pH of the copper-zinc-indium solution to 1.0 with zinc oxide at room temperature (25°C).
[0039] One replacement: Zinc powder was used as the replacement agent, the replacement temperature was 25°C, the amount of zinc powder was 1.15 times the theoretical amount, and the replacement was performed for 1 hour to obtain 59.0 g of copper slag with a copper content of 85.3%.
[0040] Secondary replacement: Zinc powder was used as the replacement agent, the replacement temperature was 25°C, the amount of zinc powder was 2.5 times the theoretical amount, and the replacement was performed for 2 hours to o...
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Abstract
The invention provides a method of comprehensively recycling valuable metal from lead sulfate slag and belongs to the technical field of hydrometallurgy. The method comprises the following steps: feeding lead sulfate slag in a stirred mill, adding sulfuric acid for intensifying leaching, leaching the copper, zinc and indium, feeding the leached copper, zinc and indium in solution, adjusting the pH of the solution with zinc hypoxide, replacing copper and indium sequentially from the solution with zinc powder to obtain slag rich in copper and indium, returning to the copper and indium recycling process, after sulfuric acid leaching, obtaining the leached slag rich in lead and silver, adding calcium chloride solution and a small amount of hydrochloric acid in the leached slag to leach the lead and silver, feeding the lead and silver in the solution, replacing silver in the lixivium with a metallic lead plate to obtain crude silver powder, adopting the electrodeposition technology in silver replacement-post solution to produce electric lead, during the electrodeposition process, generating sodium hypochlorite solution after absorbing chlorine generated on the anode by NaOH, and returning to the lead and silver leaching process by regarding silver electrodeposition-post solution as a leaching agent. The method has the characteristics of short technological processes, few working procedures and low energy consumption and cost and meets the environmental protection requirements of clean production.
Description
technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for comprehensively recovering valuable metals from lead sulfate slag. Background technique [0002] During the high-acid leaching process of zinc calcine in hydrometallurgy, the lead and silver associated with zinc are enriched in the leaching slag (because the main phase in the leaching slag is lead sulfate, the leaching slag is also called sulfuric acid lead slag), usually part of the unleached copper, zinc, indium is also left in the lead sulfate slag. The contents of Cu, Pb, Zn, In and Ag in this kind of lead slag are usually 1-10%, 20-40%, 1-10%, 100-400g / t, 100-800g / t respectively. [0003] Almost all enterprises using hydrometallurgy produce this type of lead slag, which has a large amount of lead slag, and most of them are stored directly except for a few comprehensive recycling enterprises. In addition to occupying a large amount of land resources, di...
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