本文選題：銀渣　切入點(diǎn)：堿　出處：《濕法冶金》2017年04期

【摘要】：銀渣主要含銀、硒及少量鐵、銅、鉍、銻、碲、鉛等,硒以亞硒酸銀形式存在。研究了用氫氧化鈉從銀渣中選擇性浸出硒、碲,考察了浸出時(shí)間、反應(yīng)溫度、液固體積質(zhì)量比、氫氧化鈉濃度對(duì)硒、碲浸出率的影響。試驗(yàn)結(jié)果表明:氫氧化鈉濃度和液固體積質(zhì)量比對(duì)硒、碲浸出率影響較大,硒和部分碲被浸出,其他元素如銀、銅、鐵等及部分碲留在渣中,浸出過(guò)程具有選擇性;在反應(yīng)溫度95℃、液固體積質(zhì)量比4∶1、氫氧化鈉初始質(zhì)量濃度200g/L、攪拌速度250r/min條件下浸出4h,硒、碲浸出率分別為97.22%和36.75%。此外,也研究了用硝酸浸出堿浸渣中的銀。浸出渣衍射分析結(jié)果表明,渣中殘留的硒主要以亞硒酸鈉形式存在,需要用氫氧化鈉再次浸出。
[Abstract]:Silver slag mainly contains silver, selenium and a small amount of iron, copper, bismuth, antimony, tellurium, lead, etc. Selenium exists in the form of silver selenite.The selective leaching of selenium and tellurium from silver slag by sodium hydroxide was studied. The effects of leaching time, reaction temperature, volume / mass ratio of liquid to solid, concentration of sodium hydroxide on the leaching rate of selenium and tellurium were investigated.The results show that the concentration of sodium hydroxide and the mass ratio of liquid to solid have great influence on the leaching rate of selenium and tellurium. Selenium and some tellurium are leached, other elements such as silver, copper, iron and some tellurium are left in the slag, and the leaching process is selective.At the reaction temperature of 95 鈩，

本文編號(hào)：1724331