System for recovering valuable metals in sludge

The invention discloses a system for recovering valuable metals in sludge, which comprises a leaching system, a leaching post-treatment system and an extraction system, and the leaching system comprises at least two stages of leaching devices which are connected in series; the leaching post-treatmen...

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Hauptverfasser: DUAN JIANJUN, ZENG HAILONG, MA LIKUN, LOU JIANGHUI, WANG JINRUI, WANG JUAN, LI ZURU, ZHANG JINYONG, YU JINLONG, HUANG DENGKE, MA ZHIQING
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention discloses a system for recovering valuable metals in sludge, which comprises a leaching system, a leaching post-treatment system and an extraction system, and the leaching system comprises at least two stages of leaching devices which are connected in series; the leaching post-treatment system comprises a liquid storage tank, an iron removal reaction tank, a second solid-liquid separation device, an acid dissolution tank, a generation tank and a third solid-liquid separation device; the extraction system comprises at least three stages of extraction devices which are connected in series, the first-stage extraction device is connected with a liquid outlet of the second solid-liquid separation device, and the last-stage extraction device is connected with the last-stage leaching device. The recovery of copper and nickel in the filtrate after iron removal can be effectively realized, and pure copper sulfate and nickel sulfate solutions are respectively produced; the system for recovering valuable m