The invention provides a method for recycling rare and precious metals from acid mud, and relates to the technical field of recycling and reusing of precious metals from the acid mud. The method comprises the following steps: acid mud pretreatment,
copper recycling, lead recycling and
selenium recycling. The method is particularly suitable for the acid mud with the following features: Pb 30-50%, Se 2-15%, Bi 1-5%, Cu 2-10%, Au 2-10 g / t and Ag 30-200 g / t. The method has the beneficial effects that by acid mud washing,
copper metal in the acid mud is recycled and is leached by mixed acid, by high accumulation ability of lead to gold, silver and
bismuth, lead-
bismuth alloy is prepared by pyrogenic-process
smelting, the rare and precious metals such as the
bismuth, the gold and the silver are recycled to a maximum extent,
selenium powder is prepared in a reducing manner by
sulfur dioxide, and compared with a
sodium sulfite technology, the method has the feature that
sodium salt
wastewater or
sodium sulfate crystal cannot be formed.
Solid waste generated in the technology is mainly from two-time
solid-liquid separation, filter residues of
solid-liquid separation are rich in lead element, the lead element is used for pyrogenic-process
smelting of lead to form the lead-bismuth
alloy, therefore, a closed cycle
system is formed in a whole technological process, the environment is not polluted, production costs are reduced, and
environmentally friendly and clean production is realized.