有色金属科学与工程
有色金屬科學與工程
유색금속과학여공정
JIANGXI NONFERROUS METALS
2014年
1期
1-8
,共8页
侯栋科%彭兵%柴立元%彭宁%闫缓%胡明
侯棟科%彭兵%柴立元%彭寧%閆緩%鬍明
후동과%팽병%시립원%팽저%염완%호명
锌焙砂%铁酸锌%还原焙烧%浸出分离
鋅焙砂%鐵痠鋅%還原焙燒%浸齣分離
자배사%철산자%환원배소%침출분리
zinc calcine%zinc ferrite%reduction roasting%leaching separation
研究了选择性还原焙烧-硫酸浸出两段工艺处理高铁锌焙砂的方法.首先在CO还原气氛下将锌焙砂中的铁酸锌选择性转化为氧化锌和磁铁矿，然后采用硫酸浸出使可溶锌溶出而铁存留于渣中，实现铁锌有效分离.主要考察了还原焙烧以及硫酸浸出的工艺条件对铁锌分离效果的影响，并采用化学分析法及XRD、SEM-EDS的检测手段对焙烧样品进行分析.以可溶性锌和亚铁的含量作为焙烧评价指标，得出最佳焙烧条件为：焙烧温度750℃，焙烧时间60 min，CO浓度8%，CO/（CO+CO2）气氛比例20%，此条件下可溶锌率由原焙砂中的79.64%提高到91.75%；以铁锌浸出率为考察指标，得出最佳浸出条件为∶常温浸出，浸出时间30 min，浸出酸度90 g/L，液固比10∶1，此条件下锌铁浸出率分别为91.8%和7.17%.
研究瞭選擇性還原焙燒-硫痠浸齣兩段工藝處理高鐵鋅焙砂的方法.首先在CO還原氣氛下將鋅焙砂中的鐵痠鋅選擇性轉化為氧化鋅和磁鐵礦，然後採用硫痠浸齣使可溶鋅溶齣而鐵存留于渣中，實現鐵鋅有效分離.主要攷察瞭還原焙燒以及硫痠浸齣的工藝條件對鐵鋅分離效果的影響，併採用化學分析法及XRD、SEM-EDS的檢測手段對焙燒樣品進行分析.以可溶性鋅和亞鐵的含量作為焙燒評價指標，得齣最佳焙燒條件為：焙燒溫度750℃，焙燒時間60 min，CO濃度8%，CO/（CO+CO2）氣氛比例20%，此條件下可溶鋅率由原焙砂中的79.64%提高到91.75%；以鐵鋅浸齣率為攷察指標，得齣最佳浸齣條件為∶常溫浸齣，浸齣時間30 min，浸齣痠度90 g/L，液固比10∶1，此條件下鋅鐵浸齣率分彆為91.8%和7.17%.
연구료선택성환원배소-류산침출량단공예처리고철자배사적방법.수선재CO환원기분하장자배사중적철산자선택성전화위양화자화자철광，연후채용류산침출사가용자용출이철존류우사중，실현철자유효분리.주요고찰료환원배소이급류산침출적공예조건대철자분리효과적영향，병채용화학분석법급XRD、SEM-EDS적검측수단대배소양품진행분석.이가용성자화아철적함량작위배소평개지표，득출최가배소조건위：배소온도750℃，배소시간60 min，CO농도8%，CO/（CO+CO2）기분비례20%，차조건하가용자솔유원배사중적79.64%제고도91.75%；이철자침출솔위고찰지표，득출최가침출조건위∶상온침출，침출시간30 min，침출산도90 g/L，액고비10∶1，차조건하자철침출솔분별위91.8%화7.17%.
Zinc recovery from zinc calcine containing high content of iron by selective reduction roasting and acid leaching was investigated. Zinc ferrite in zinc calcine was selectively transformed to zinc oxide and magnetite under CO and CO2 atmosphere. The reduced zinc calcine was then leached with sulfuric acid for dissolving the soluble zinc in the leaching solution and leaving the iron in the residue as magnetite. The effects of reaction parameters of reduction roasting and sulfuric acid leaching on the recovery of zinc were studied and the reduced sample was analyzed by chemical analysis, XRD and SEM-EDS. Using the content of soluble zinc and ferrous iron as the evaluation index of the reduction roasting, the optimum conditions were obtained as follows: roasting temperature (750 ℃), roasting time (60 min), CO concentration (8 %) and CO/(CO+CO2) ratio (20 %). Under the optimum conditions, the content of soluble zinc in zinc calcine increased from 79.64 % to 91.75 %. With the leaching efficiency of zinc and iron as the evaluation index of the acid leaching, the best leaching conditions were obtained as follows:leaching temperature (normal temperature), leaching time (30 min), sulfuric acid concentration (90 g/L) and liquid to solid ratio (10∶1). The leaching efficiency of zinc and iron under this condition is 91.8%and 7.17%, respectively.
