(1. 中南大学 化学化工学院 有色金属资源化学教育部重点实验室，长沙 410083；
2. 株洲冶炼集团股份有限公司，株洲 412000)
摘 要: 采用电阻炉对湿法炼锌沉铁渣和浸锌渣进行焙烧预处理。考察氧气浓度、焙烧温度、焙烧时间和气体流量对沉铁渣脱硫率以及焙烧矿硫含量的影响；利用XRD和SEM-EDS技术对沉铁渣焙烧矿和浸锌渣焙烧矿的物相及微观形貌进行表征。结果表明：焙烧脱硫处理湿法炼锌沉铁渣和浸锌渣是可行的；沉铁渣焙烧预处理的合适工艺条件为氧气浓度70%，气体流量0.2 L/min，经1300 ℃焙烧反应20 min，沉铁渣脱硫率为98.2%，焙烧矿硫含量从8.15%降低到0.253%(质量分数)，达到炼铁入炉原料硫含量的要求；沉铁渣焙烧矿的物相组成主要是ZnFe2O4，浸锌渣焙烧矿的物相组成主要是ZnFe2O4和Pb2SO5，Pb2SO5的生成表明浸锌渣中PbSO4分解脱硫不彻底，这是浸锌渣焙烧矿硫含量偏高的主要原因。
关键字: 沉铁渣；浸锌渣；焙烧预处理；脱硫
（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
