硫铁矿烧渣铁系氧化物的酸溶特性  

Acid Dissolution Properties of Ferric Oxide in Pyrite Cinder

作　　者：詹咏[1] 张焕焕[1] 疏醒 沈丹妮 董滨[3] 

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]上海纺织建筑设计研究院,上海200060 [3]同济大学环境科学与工程学院,上海200092

出　　处：《上海理工大学学报》2017年第1期90-96,共7页Journal of University of Shanghai For Science and Technology

摘　　要：为了改善硫铁矿烧渣酸溶工艺,提高铁的浸取率,研究了在70℃,反应3h,酸过量系数为1.2的条件下,不同质量分数的盐酸、硫酸以及两者混合后硫铁矿烧渣中铁系氧化物的酸溶特性.通过酸溶效果的数值模拟分析可知,盐酸酸溶效果优于硫酸酸溶.由混酸实验结果发现,混酸溶解效果优于相同H+浓度的单酸.此外,为了更准确地说明酸溶特性,对酸溶后的残渣进行了ICP,XRD和SEM表征.结果发现:原矿渣中主要含有的Fe3O4含量明显减少,表面呈现复杂结构的团块状也被分解成不同形状的小颗粒;且硫酸在酸溶过程中与矿渣中的金属形成新的晶体化合物,阻碍溶解.For improving the acid dissolution process of pyrite cinder, and enhancing the extraction efficiency of Fe,in the condition when the reaction temperature, reaction time and acid over dose coefficient were 70 ℃, 3 h and 1.2 respectively, the acid dissolution properties of ferric oxide in pyrite cinder were explored under different mass fraction of hydrochloric acid, sulfuric acid and mixed acid. By analyzing the numerical simulation results, it is indicated that the effect of hydrochloric acid is better than that of sulfuric acid. By the mixed acid assay, it is shown the iron dissolution rate of mixed acid is superior to that of single acid with the same concentration. Moreover,for an accurate description of the effect of acid-solubility, the residues after acid dissoltion were analyzed by ICP-OES,XRD and SEM. The results show that the content of Fe3O4 in pyrite cinder reduces significantly. The complex structures are degraded into small particles. And after dissolving by sulfuric acid, the metallic elements in pyrite cinder will form new crystals by combining SO）4^2-ion,then impeding the dissolution of iron.

关 键 词：硫铁矿烧渣 酸溶 混酸 数值模拟 结晶 

分 类 号：X754[环境科学与工程—环境工程]