本文選題：銅煙灰　切入點：磁選　出處：《江西理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：銅火法冶煉過程產(chǎn)生大量煙灰,其中含有Cu、Fe、Pb、Zn等多種有價金屬,同時含有As、Cd等有害元素。銅煙灰綜合利用一直受到企業(yè)和科研工作者關注,但傳統(tǒng)處理方法仍然存在工藝流程長、有價元素回收率低、有害物質(zhì)難于開路等難題。論文探索銅煙灰選冶聯(lián)合預處理技術,同時開展高砷浸出液高效脫砷試驗研究,對銅煙灰的綠色高效綜合利用技術發(fā)展具有重要的理論意義和現(xiàn)實價值。論文根據(jù)銅煙灰的化學組成和物相特征,研究酸浸—磁選聯(lián)合預處理銅煙灰技術,將鐵富集到磁選渣,銅、砷、鎘等浸出進入浸出液,探索了硫酸初始濃度、液固比、反應溫度、反應時間、磁感應強度等參數(shù)對各金屬浸出率、磁選渣鐵含量的影響。實驗結(jié)果表明,當硫酸初始濃度為0.50 mol·L-1、液固比為L/S=6、反應溫度T=65℃、反應時間t=1.5 h時,銅、砷、鎘浸出率分別為48.47%、90.01%和90.14%,鐵只有12.56%進入浸出液、約85%進入磁選渣,浸出渣含鉛54%、含鉍5.20%。實現(xiàn)了煙灰中鐵的有效富集和開路,有效減少了大量鐵對后續(xù)回收處理帶來的困難。對酸浸—磁選得到的高砷酸浸液進行了選擇性沉砷研究,研制了選擇性脫砷劑A,最佳條件為:A加入量60g·L-1、H2O2加入量180mL·L-1、反應時間60 min、反應溫度65℃、陳化時間30 min,此時,砷脫除率達95.07%,銅、鎘分別只有2.83%和2.88%進入富砷渣,表明脫砷劑A具有很好的選擇性沉砷效果。對富砷渣開展了堿溶再生脫砷劑的實驗研究,當堿溶溫度為75℃、NaOH用量為理論用量的3.13倍、堿溶時間為45 min、液固比為6:1時,富砷渣中97.31%的As被脫除,實現(xiàn)了脫砷劑的再生。在最佳浸出液脫砷條件下,將60g·L-1的再生脫砷劑和15 g·L-1新鮮脫砷劑A加入到新鮮的高砷酸浸液中,砷脫除率為95.68%,表明,經(jīng)過再生得到的脫砷劑能夠?qū)崿F(xiàn)循環(huán)使用。
[Abstract]:A large amount of soot is produced in the copper pyrometallurgical process, which contains many valuable metals, such as Cu, Fe, Pb, Zn, and so on, as well as harmful elements such as Ash and CD. The comprehensive utilization of copper soot ash has been concerned by enterprises and researchers, but the traditional treatment method still has a long process flow. The recovery rate of valuable elements is low, the harmful substances are difficult to open the circuit and so on. This paper explores the combined pretreatment technology of copper soot ash processing and metallurgy, and carries out high efficiency arsenic removal test of high arsenic leaching solution. It has important theoretical significance and practical value for the development of green and efficient comprehensive utilization technology of copper soot ash. According to the chemical composition and phase characteristics of copper soot ash, this paper studies the technology of combined pretreatment of copper soot ash with acid leaching and magnetic separation, and concentrates iron into magnetic separation slag. The effects of initial concentration of sulfuric acid, liquid-solid ratio, reaction temperature, reaction time and magnetic induction intensity on the leaching rate and the content of iron in magnetic separation slag were investigated. When the initial concentration of sulfuric acid is 0.50 mol 路L ~ (-1), the ratio of liquid to solid is L / S _ (6), the reaction temperature is 65 鈩，

本文編號：1615845