(1. 中南大學(xué)冶金與環(huán)境學(xué)院，長(zhǎng)沙410083；
2. 中南大學(xué)國(guó)家重金屬污染防治工程技術(shù)研究中心，長(zhǎng)沙410083)
摘 要: 針對(duì)鋅浸渣中鋅難于選擇性浸出回收的難題，提出硫酸銨焙燒-選擇性浸出回收鋅的新工藝。該工藝通過硫酸銨焙燒改變鋅浸渣中鋅鐵物相，在浸出過程對(duì)鋅進(jìn)行選擇性浸出回收。研究硫酸銨加入量、焙燒溫度、焙燒時(shí)間等工藝參數(shù)對(duì)鐵酸鋅分解和鋅鐵浸出的影響，并獲得最佳的工藝參數(shù)，即硫酸銨和鐵酸鋅質(zhì)量比為4、一段焙燒溫度和時(shí)間分別為450 ℃和90 min，二段焙燒溫度和時(shí)間分別為650 ℃和60 min。在該條件下，鋅浸出率可以達(dá)到92.63%，而鐵的浸出率僅為2.04%，實(shí)現(xiàn)了鋅浸渣中鋅的選擇性浸出。
關(guān)鍵字: 鋅浸渣；鐵酸鋅；硫酸銨焙燒；鋅回收
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution,
Central South University, Changsha 410083, China）
Abstract:In order to solve the difficulty of selective leaching zinc from zinc leaching residue (ZLR), a novel process for recovery zinc from ZLR was developed by ammonia sulfate roasting-selective leaching. The phases of zinc and iron from ZLR were adjusted by roasting with ammonia sulfate before zinc was leached selectively with water. The effects of various parameters, such as ammonium sulfate addition, roasting temperature and time on decomposition rate of zinc ferrite and extractions rates of zinc and iron were investigated. The optimal experimental conditions are gotten as follows: ammonium sulfate to zinc ferrite mass ratio of 4/1, roasting temperature of 450 ℃ and time of 90 min for the first stage, roasting temperature of 650 ℃ and time of 60 min for the second stage. The extraction rate of zinc increases to 92.63% with the 2.04% extraction rate of iron under the optimal experimental conditions. Zinc can be selectively recovered from ZLR by the new process.
Key words: zinc leaching residue; zinc ferrite; ammonia sulfate roasting; zinc recovery
