Effect of CacO_(3) on volatilization of self-reduced zinc from blast furnace dust

To solve the problem of low reduction extraction rate of zinc from blast furnace dust,the effects of CacO3 addition,reduction temperature,and reduction time on self-reduction zinc extraction were studied through high-temperature reduction experiment,and the mechanism of how CaCO_(3) addition promotes zinc ferrite reduction was analyzed.The zinc removal rate can reach 98.82%when the blast furnace dust is reduced at 1000℃ for 25 min by adding 10 mass%CaCO_(3).At low temperature,CaCO_(3) can enhance the reduction and decomposition of ZnFe_(2)O_(4)(which is difficult to reduce)into ZnO and low-valent iron oxides.After CaCO_(3) is decomposed at high temperature,CO_(2) is produced to undergo gasification reaction with carbon in blast furnace dust,and co is generated to provide more reducing agents for the whole reduction system.CaO generated by decomposition can also catalyze the gasification reaction of carbon,thus improving the removal rate of zinc in the reduction process of dust.

高炉瓦斯灰(泥)中锌的萃取利用

我国南方数家钢铁厂瓦斯灰(泥)中含有具有利用价值ZnO。本法以瓦斯灰(泥)为原料,不需前期加工,用NH4Cl作萃取剂提取Zn制取活性ZnO。本法条件温和,较传统的酸法消耗少,腐蚀小,萃取剂可回用,所以成本低廉,加之国家有关优惠政策,使用本法利用瓦斯灰(泥)有较大的优势。

铅渣鼓风炉烟灰中回收铟的实践

介绍某厂铟的生产工艺及主要技术经济指标,分析生产中常见故障的成因并提出解决方法。

用P204从鼓风炉烟尘浸出液中萃取铟的试验研究

试验研究了从云南某铅锌厂鼓风炉烟尘浸出液中萃取铟。以P204为萃取剂,煤油为稀释剂,考察了萃原液的酸度,萃取相比、分配比、温度、时间等因素对铟萃取率的影响。试验结果表明,P204体积分数为30%,萃原液酸度2mol/L,萃取相比1:4,萃取温度40℃,萃取时间60s,铟萃取率为96%左右。

高炉煤气干法除尘灰提锌技术的应用

在高炉炼铁时,会有大量的粉尘随着高炉煤气洒出,这就必须经过旋风除尘器、重力除尘器以及布袋除尘器等对粉尘进行收集,从而形成高炉干法除尘灰。在进行高炉煤气干法除尘灰时,其内部含有大量的锌元素,基于此,论文主要对高炉煤气干法除尘灰提锌技术的应用进行分析,以供参考。

高炉粉尘还原提锌的热力学分析与试验研究

为充分利用高炉粉尘中的Fe、C等有价资源,对高炉粉尘还原提锌过程进行了热力学计算与分析,并以烧结除尘灰、高炉重力灰和高炉布袋灰为主要原料进行还原提锌试验。结果表明,随还原温度的升高或配碳量的增加,球团的金属化率和脱锌率均呈现增加的趋势。为得到最佳的金属化率、脱锌率,应控制球团的还原温度为1200℃、碳氧摩尔比为1.40。

2号高炉干法除尘系统集中卸灰改造

针对炼铁厂2号高炉干法除尘系统加湿卸灰所带来的二次扬尘现象,提出了集中卸灰改造的方案,并对改造方案的可行性和改造费用情况作了探讨,同时阐述了改造的实施过程和改造后的操作要求。