关键词: 高硒高银烟尘, 浸出硒, 熔炼, 氰化, 金银

Abstract: In view of the high selenium，silver，lead and gold content in the smelting fume dust of a silver cyanide mud converter，the process of preferential separation of selenium with dilute sulfuric acid， recovery of most gold and silver by pyrometallurgical smelting，and cyanide leaching of gold and silver from smelting slag were studied in order to avoid the adverse effects of hash pyrometallurgical smelting operation environment，high slag rate，low gold and silver recovery rate，and selenium on subsequent processes. The optimum technological conditions for the preferential separation of selenium with dilute sulfuric acid are that the concentration of dilute sulfuric acid is 25%，the mass ratio of solid to liquid is 1∶6，and the reac⁃ tion temperature is 85 ℃. The optimum technological conditions for the reduction of selenium leaching solu⁃ tion are that the dosage of sodium sulfite is 110 g/L，the dosage of thiourea is 10 g/L，and the aging time is 12 h. The optimum technological conditions for pyrometallurgical smelting of selenium leaching residue are that the mass ratio of leaching residue，iron powder，sodium carbonate and coal is 50∶1∶15∶5. The opti⁃ mum technological conditions for cyanide leaching of gold and silver from pyrometallurgical smelting slag are that pulp concentration is 33%，calcium oxide concentration is 0.12%，sodium cyanide concentration is 1.2%，cyanide leaching time is 96 h. The try-production adopts the process conditions determined by the test. A total of 40 tons of high selenium and silver fuem dust with a gold grade of 150 g/t，a silver grade of 7% and a selenium grade of 6% were treated，gaining gold of 5.98 kg，the gold recovery rate of 99.7%， the silver of 2.77 t，the silver recovery rate of 99.1%，the selenium of 2.12 t，and the selenium recovery rate of 88.35%. The economic benefit reaches 1.131 9 million yuan. The economic，environmental and so⁃ cial benefits are remarkable.

Key words: high selenium and silver fume ash, leaching selenium, smelting, cyanidation, gold and sil? ver