利用改质和酸浸从炼钢粉尘中分离锌的研究
Study on the separation of zinc from steelmaking dust by modification and acid leaching
王鑫 1张羽堂 1蒋刘东 2苑瑞圆 1杜传明1
作者信息
- 1. 东北大学冶金学院,辽宁沈阳 110819
- 2. 攀钢集团攀枝花钢铁研究院有限公司,四川攀枝花 610031
- 折叠
摘要
炼钢粉尘是冶金工业产生的固废之一,富含Zn元素,如何将其资源化利用对冶金工业的绿色低碳发展具有重要意义.炼钢粉尘中Zn主要以ZnFe2O4形式存在,其结构稳定难以破坏,本研究采用CaO焙烧改质,将ZnFe2O4转化为ZnO,再通过稀盐酸选择性浸出Zn元素;探究了 CaO改质、pH值、温度、固液比对改质炼钢粉尘中Zn等元素溶出的影响规律.CaO改质可有效地将ZnFe2O4转化为Ca2Fe2O5和易于溶解的ZnO,从而提高了 Zn的溶出率,并且使Fe元素难以溶解;随着pH值的降低改质粉尘中主要元素的浸出率都升高;提高温度和降低固液比都有利于Zn的浸出,并且温度升高会抑制Si的浸出.在pH=3、温度50℃、固液比1∶25的条件下,Zn浸出率为72.73％,而Fe不溶出,实现了 Zn的选择性浸出,同时提高了浸出效率.浸出后,浸出液可通过电解沉积回收金属Zn;浸出渣主要由Ca2Fe2O5组成,可作为冶金熔剂再利用.
Abstract
Steelmaking dust is one of the solid wastes produced in metallurgical industry,and it has a higher Zn content.The separation and recovery of Zn from steelmaking dust is of great significance to green and low-carbon development of metallurgical industry.Zn mainly exists in the form of ZnFe2O4 in steelmaking dust.In order to separate Zn and Fe,CaO modification was adopted to convert ZnFe2O4 into ZnO,and then selective leaching was used to extract the Zn element by using dilute hydrochloric acid.The effects of CaO modification,pH value,temperature,and solid-liquid ratio on the dissolution of Zn and other elements from steelmaking dust were investigated.CaO modification could effectively convert the ZnFe2O4 into Ca2Fe2O5 and ZnO,which is easily soluble in acidic solution,resulting in a higher dissolution ratio of Zn and making Fe difficult to dissolve;as the pH decreased,the leaching ratios of the main elements from the modified dust increased;increasing the temperature and reducing the solid-liquid ratio are beneficial for the leaching of Zn,and increasing temperature will inhibit the leaching of Si.Under the conditions of pH=3,temperature 50℃,solid-liquid ratio 1:25,the leaching ratio of Zn was 72.73％,while that of Fe was not leached,achieving selective leaching of Zn.After leaching,electrolytic deposition can be used to recover metal Zn from the leachate.The leaching residue is mainly composed of Ca2Fe2O5,and can be reused as a metallurgical flux.
关键词
炼钢粉尘/酸浸/锌回收/ZnFe2O4/CaO改质Key words
steelmaking dust/acid leaching/Zn recovering/ZnFe2O4/CaO modification引用本文复制引用
出版年
2024
NETL
NSTL
万方数据