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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第2期    总第251期    2020年2月

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文章编号:1004-0609(2020)-02-0421-10
钢铁厂烧结机头灰中铅的配位浸出行为与综合回收
王晨宇,邓志敢,李兴彬,魏 昶,孙 朴,世仙果,李旻廷

(昆明理工大学 冶金与能源工程学院,昆明 650093)

摘 要: 针对钢铁厂烧结机头灰中富含铅、铁、碳、钾、氯等多种有价元素的特点,根据氯离子与铅配位的特性,采用配位浸出的方式实现铅与铁、碳等元素的选择性分离回收。SEM-EDS、XRD等研究分析表明,烧结机头灰中铅主要以絮状的KPb2Cl5等物相吸附于铁氧化合物、硅铝酸盐和碳颗粒表面,铁主要以Fe2O3和Fe3O4物相存在。实验考察了溶液pH值、温度、氯离子浓度、浸出时间和液固比等因素对铅浸出率的影响。研究表明,在溶液pH值为3.0,浸出温度为80 ℃,氯离子浓度为6 mol/L,液固比(mL/g)为10:1,浸出时间为2 h的优化条件下,烧结机头灰中铅化合物与氯发生配位溶解反应生成 (i=1~4)等易溶解的络合离子,实现铅的浸出,铅浸出率为95.7%;而烧结机头灰中对钢铁冶炼有用的铁、碳、硅、铝等元素不被浸出,富集在浸出渣中,较好地实现了选择性浸出。浸出液中的铅经冷却结晶、洗涤纯化后,获得纯度为99%的氯化铅产品。

 

关键词: 烧结机头灰;配位浸出;资源化利用;铅回收

Coordination leaching behaviors of lead from sintering dust of steel plants
WANG Chen-yu, DENG Zhi-gan, LI Xing-bin1, WEI Chang, SUN Pu, SHI Xian-guo, LI Min-ting

Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

Abstract:According to the features of the sintering dust with various valuable elements, a selective coordination leaching process realizing the selective separation and recovery of lead was studied. The SEM–EDS and XRD analysis results show that lead is absorbed on the surface of iron oxide compounds, aluminosilicate and carbon grain exist in sintering dust in the form of flocculent KPb2Cl5, and iron mainly exists in the form of Fe2O3 and Fe3O4. The effects of pH value, leaching temperature, Cl- concentration, leaching time and liquid-to-solid (L/S) on the leaching ratio of lead were investigated. The results show that, under the optimal conditions such as the pH value of 3.0, leaching temperature of 80 ℃, Cl- concentration of 6mol/L, liquid-solid ratio of 10:1 and leaching time of 2 h, the lead compounds such as KPb2Cl5 are adsorbed on the surface of iron oxide compounds, and the aluminosilicate and carbon grains react with chlorine to form soluble complexes such as (i=1-4). The leaching ratio of lead is up to 95.7%. The selective coordination leaching process is achieved. Iron, carbon, silicon and aluminum, which are useful for iron and steel smelting, are enriched in leaching residue, while lead is leached and dissolved in the leaching solution. The lead in the leaching solution is crystallized by cooling crystallizing, washing and purification, the lead chloride product with purity of 99% is obtained.

 

Key words: sintering dust; coordination leaching; resource utilization; lead recycling

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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