湿法炼锌沉铁渣和浸锌渣的焙烧预处理  

Roasting pretreatment of iron-sinking slag and zinc leaching residue in zinc hydrometallurgy

作　　者：刘洋[1] 谭军[1] 尹周澜[1] 刘常青[1] 陈启元[1] 张平民[1] 廖舟 王心皞 

机构地区：[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

出　　处：《中国有色金属学报》2016年第1期212-222,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2011AA061003)~~

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Zn Fe2O4,浸锌渣焙烧矿的物相组成主要是Zn Fe2O4和Pb2SO5,Pb2SO5的生成表明浸锌渣中Pb SO4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。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 20 min 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.Zn Fe2O4 is the main phase of roasted ore of iron-sinking slag,and Zn Fe2O4 and Pb2SO5 are the main phases of roasted ore of zinc leaching residue.Generation of Pb2SO5 demonstrates the incomplete decomposition of Pb SO4.This is the main reason for the slightly high sulfur content in roasted ore of zinc leaching residue.

关 键 词：沉铁渣 浸锌渣 焙烧预处理 脱硫 

分 类 号：X758[环境科学与工程—环境工程]