Kinetics on leaching of potassium from phosphorus-potassium associated ore in HCl-H_3PO_4 media  

磷钾伴生矿中的钾在HCl-H_3PO_4混酸溶液中的浸出动力学（英文）

作　　者：Jia-yu MA Xue-lan DU Yuan-hang QIN Zai-kun WU Ru-an CHI Cun-wen WANG 马家玉;杜学兰;覃远航;吴再坤;池汝安;王存文(武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081;武汉工程大学绿色化工过程省部共建教育部重点实验室,武汉430205)

机构地区：[1]State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology, Wuhan 430081, China [2]Key Laboratory of Green Chemical Process of Ministry of Education,Wuhan Institute of Technology, Wuhan 430205, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第8期1870-1878,共9页中国有色金属学报（英文版）

基　　金：Project(51274153) supported by the National Natural Science Foundation of China;Projects(2011CDA120,2015CFB523) supported by the Natural Science Foundation of Hubei Province of China;Project(G201510) supported by the State Key Laboratory of Refractories and Metallurgy(Wuhan University of Science and Technology);China;Project(K201454) supported by the Youths Science Foundation of Wuhan Institute of Technology,China

摘　　要：In order to relieve the equipment corrosion,reduce chlorine and increase phosphorus contents in leaching solution,theleaching behavior of potassium from phosphorus-potassium associated ore in the mixed acids of hydrochloric acid and phosphoricacid was investigated.The effects of various factors,such as mass fraction of hydrochloric acid,solid-to-liquid ratio,material ratio(CaF2dosage(g)/mass of ore(g))and leaching temperature were comprehensively studied.It was found that the dissolution fractionof potassium can reach more than86%under the optimum conditions of leaching temperature95°C,HCl concentration10%,leaching time6h,solid/liquid ratio1:5,and material ratio0.1.In addition,the leaching kinetics of potassium was successfullymodeled by a semi-empirical kinetic model based on the classic shrinking core model.The data showed that the leaching process ofpotassium was controlled by the product layer diffusion and the apparent activation energy for the process was found to be54.67kJ/mol over the temperature range from65to95°C.为了减轻设备腐蚀,降低酸浸液中氯的含量及提高磷的含量,研究了磷钾伴生矿中的钾在HCl-H_3PO_4混酸溶液中的浸出动力学。考察了盐酸的质量分数、固液比、物料比(CaF_2添加量(g)与磷钾伴生矿质量(g)比)、浸出温度等几个因素对钾浸出率的影响,结果表明:在浸出温度95°C、盐酸浓度10%、浸出时间6 h、固液比1:6、物料比0.1的优化工艺条件下,钾浸出率可达86%以上。同时建立了基于经典缩合模型的半经验动力学模型,并用该模型成功地模拟了钾的浸出过程。结果表明:在65~95°C范围内,钾浸出过程属于内扩散控制步骤,表观活化能为54.67 kJ/mol。

关 键 词：KINETICS leaching POTASSIUM phosphorus-potassium associated ore activation energy K-FELDSPAR 

分 类 号：TF826.1[冶金工程—有色金属冶金]