利用超重力富集和分离Sn-3%Fe熔体中的杂质元素铁  

Enriching and separating iron impurity from Sn-3%Fe melt by super gravity

作　　者：杨玉厚 李京京 宋子睿 栾益峰 梁俊威 陈凯 李慧斌 宋波[1,2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [3]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《工程科学学报》2018年第1期41-50,共10页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51234001)

摘　　要：在粗锡精炼过程中引入超重力场,运用超重力技术研究Sn-3%Fe（质量分数）熔体中杂质元素铁在超重力场中的定向富集和过滤分离的规律,达到提纯净化粗锡的目的.结果表明,对于超重力场G=500以10℃·min^-1冷却速率凝固后的Sn-3%Fe熔体,超重力场极大强化富铁相在粗锡熔体中的沉降运动,使先析出富铁相全部富集到试样的下部区域,上部几乎找不到富铁相颗粒.下部尾锡中的铁质量分数达到4.817%,而上部精锡中的铁质量分数降低到0.036%,精锡中铁的脱除率高达98.78%.在超重力场中过滤的Sn-3%Fe熔体可实现富铁相杂质和精锡液的有效分离,当重力系数大于30时,精锡的回收率随重力系数的增大而提高.在超重力场G=100,240℃条件下,Sn-3%Fe熔体过滤1 min后,精锡液几乎全部被分离到坩埚底部,富铁相杂质被截留在过滤碳毡上部,下部精锡中找不到富铁相杂质的颗粒,精锡中铁质量分数降至0.253%,富铁渣中铁质量分数高达11.528%.精锡中铁的脱除率高达91.44%,超重力场中精锡的回收率高达82.69%.Iron is one of the major impurity elements in industrially produced crude tin,and it is always removed first during the refining process.In this study,the super gravity field was introduced in the crude tin refining process in order to investigate the directional enriching and separating laws of iron impurity from Sn-3% Fe melt,and thereby purify the crude tin.The experimental results showed that with the gravity coefficient G=500 at a cooling rate of ν=10 ℃·min^-1,all of the iron-rich phase gathered at the bottom area of the sample;it was hard to find any iron-rich phase particles at the upper area of the sample since super gravity greatly increased the sedimentation of the iron-rich phase in the crude tin melt.The mass percentage of iron in the tailing tin was up to 4.817%,while that in the refined tin was only 0.036%.Consequently,the removal rate of iron was up to 98.78%.The iron-rich phase impurity could be separated effectively from the Sn-3% Fe melt using filtration method in the super gravity field,and the recovery rate of the refined tin increased with increase in gravity coefficient in the range of G30.After filtration at 240 ℃ by gravity coefficient G=100 for1 min,the refined tin was separated to the bottom of the crucible,and the iron-rich dross was intercepted by the carbon fiber felt.Themass percentage of iron in the refined tin was only 0.253%,while that in the iron-rich dross reached 11.528%.As a result,the removal rate of iron was up to 91.44%,while the recovery rate of the refined tin was as high as 82.69%.

关 键 词：超重力 富铁相杂质 富集 分离 粗锡精炼 

分 类 号：TF814[冶金工程—有色金属冶金]