Recovery method for valuable metals in copper anode slime

A recovery method for valuable metals in copper anode slime, comprising the following steps:

• mixing copper anode slime with a concentrated sulfuric acid to obtain a first mixture, and subjecting the first mixture to sulfation roasting to obtain a selenium-containing soot and a calcine;
• subjecting the selenium-containing soot to water absorption, first reduction, and drying in sequence to obtain a crude selenium;
• mixing the calcine with a sulfuric acid solution to obtain a second mixture, and subjecting the second mixture to oxygen stressing and acid leaching to obtain a copper-tellurium-containing leachate and a copper-selenium-tellurium-removed anode slime;
• mixing the copper-tellurium-containing leachate with a copper powder to obtain a third mixture, and subjecting the third mixture to second reduction to obtain a copper-tellurium slag and a copper sulfate solution;
• mixing the copper-selenium-tellurium-removed anode slime with a first charcoal to obtain a fourth mixture, and subjecting the fourth mixture to low-temperature vacuum carbothermal reduction at 400° C. to 550° C. to obtain an arsenic oxide volatile and an arsenic-removed anode slime;
• subjecting the arsenic-removed anode slime to high-temperature vacuum carbothermal reduction at 850° C. to 1,100° C. to obtain a lead-bismuth mixed volatile and a gold-silver-antimony-rich residue;
• subjecting the gold-silver-antimony-rich residue to vacuum distillation to obtain a silver-antimony volatile and a gold-rich residue;
• subjecting the silver-antimony volatile to refining by oxidation to obtain an antimony oxide volatile and a crude silver, and subjecting the crude silver to electrolysis to obtain silver;
• and
• subjecting the gold-rich residue to leaching gold by chlorination, third reduction, and electrolysis in sequence to obtain gold.