(1. 中南大學 化學化工學院 有色金屬資源化學教育部重點實驗室，長沙 410083；
2. 株洲冶煉集團股份有限公司，株洲 412000)
摘 要: 采用電阻爐對濕法煉鋅沉鐵渣和浸鋅渣進行焙燒預處理。考察氧氣濃度、焙燒溫度、焙燒時間和氣體流量對沉鐵渣脫硫率以及焙燒礦硫含量的影響；利用XRD和SEM-EDS技術對沉鐵渣焙燒礦和浸鋅渣焙燒礦的物相及微觀形貌進行表征。結(jié)果表明：焙燒脫硫處理濕法煉鋅沉鐵渣和浸鋅渣是可行的；沉鐵渣焙燒預處理的合適工藝條件為氧氣濃度70%，氣體流量0.2 L/min，經(jīng)1300 ℃焙燒反應20 min，沉鐵渣脫硫率為98.2%，焙燒礦硫含量從8.15%降低到0.253%(質(zhì)量分數(shù))，達到煉鐵入爐原料硫含量的要求；沉鐵渣焙燒礦的物相組成主要是ZnFe2O4，浸鋅渣焙燒礦的物相組成主要是ZnFe2O4和Pb2SO5，Pb2SO5的生成表明浸鋅渣中PbSO4分解脫硫不徹底，這是浸鋅渣焙燒礦硫含量偏高的主要原因。
關鍵字: 沉鐵渣；浸鋅渣；焙燒預處理；脫硫
（1. Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education,
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Zhuzhou Smelter Group Co., Ltd., Zhuzhou 412000, China）
Abstract:The iron-sinking slag and zinc leaching residue were pretreated in resistance furnace. The effects of oxygen concentration, roasting temperature, roasting time and gas flow on the desulfurization rate of iron-sinking slag and sulfur content of roasted ore were studied. The phase composition and changes in microstructure of roasted ores were discussed and analyzed by XRD and SEM-EDS. The results show that the sulfur element in iron-sinking slag and zinc leaching residue is successfully discharged as gas form. The optimum conditions of roasting pretreatment by using resistance furnace are 1300 ℃ for 20min with oxygen concentration 70% at 0.2 L/min gas flow. Under the pretreatment conditions, the desulfurization rate is as high as 98.2%, and sulfur content turns from 8.15% to 0.253%(mass fraction), and this meets the requirements of low sulfur content for iron-making. ZnFe2O4 is the main phase of roasted ore of iron-sinking slag, and ZnFe2O4 and Pb2SO5 are the main phases of roasted ore of zinc leaching residue. Generation of Pb2SO5 demonstrates the incomplete decomposition of PbSO4. This is the main reason for the slightly high sulfur content in roasted ore of zinc leaching residue.
Key words: iron-sinking slag; zinc leaching residue; roasting pretreatment; desulfurization
