脱磷渣中有价元素在不同有机酸溶液中的浸出行为  

Dissolution Behavior of Valuable Elements from Dephosphorization Slag in Different Kinds of Organic Acids

作　　者：蒋佳霖 李尚兵[2] 王鑫 杜传明 JIANG Jialin;LI Shangbing;WANG Xin;DU Chuanming(School of Metallurgy,Northeastern University,Shenyang 110819,China;Jiangsu yonggang Group Co.,Ltd.,Zhangjiagang 215600,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]江苏永钢集团有限公司,江苏张家港215600

出　　处：《湿法冶金》2024年第2期140-146,共7页Hydrometallurgy of China

基　　金：国家自然科学基金资助项目(52104326);中国博士后科学基金资助项目(2022M721415)。

摘　　要：脱磷渣中含有大量CaO、SiO_(2)、FeO、P_(2)O_(5)等有价组元,具有作为土壤改良剂和肥料的潜力。为了推动脱磷渣在农业中的应用,有必要了解其在有机酸溶液中的浸出行为。考察了pH和有机酸类型对脱磷渣中各有价元素浸出率的影响规律。结果表明:脱磷渣中的主要矿物相为富铁相(RO相)、CaFeSiO_(4)基体相和C_(2)S-C_(3)P固溶体;渣中Ca、Si元素主要分布在含磷固溶体和基体相中,P元素富集在C_(2)S-C_(3)P相中,Fe元素主要分布在RO相中;pH降低可明显促进脱磷渣溶解,大部分脱磷渣能在枸橼酸溶液中溶解;在pH=5时,Ca、Si、Mg元素浸出率约为90%,P浸出率达68.84%,实现了有价元素的浸出。Dephosphorization slag contains a large amount of valuable components such as CaO,SiO_(2),FeO,P_(2)O_(5),etc.,and has the potential to be used as soil amendment and fertilizer.To promote utilization of dephosphorization slag in agriculture,it is necessary to understand its dissolution behavior in the organic acid solution.The influence of pH and organic acid type on the dissolution ratios of various valuable elements from dephosphorization slag was investigated.The results show that the main mineral phases in the dephosphorization slag are RO phase,CaFeSiO_(4)matrix phase,and C_(2)S-C_(3)P solid solution.Ca and Si elements in the slag are mainly distributed in the C_(2)S-C_(3)P solid solution and CaFeSiO_(4)matrix phase,while the P element is enriched in the C_(2)S-C_(3)P solid solution.Fe element is mainly distributed in the RO phase.As the pH value decreased,the dissolution of slag is significantly promoted,and most of the dephosphorization slag can be dissolved in the citric acid solution.At pH=5,the dissolution ratios of Ca,Si,Mg elements are about 90%,and the P dissolution ratio is 68.84%,achieving the dissolution of valuable elements.

关 键 词：脱磷渣 土壤改良剂 有价元素 浸出 有机酸 

分 类 号：TF803.21[冶金工程—有色金属冶金] TD989[矿业工程—选矿] TF09