埃洛石粘土矿物对氨氮的吸附规律（英文）

发布时间：2018-05-31 20:34

本文选题：离子型稀土矿区 + 埃洛石　；参考：《Transactions of Nonferrous Metals Society of China》2017年07期

【摘要】：中国南方离子型稀土矿区土壤氨氮污染日趋严重。埃洛石是矿区土壤的主要粘土成分之一。研究了埃洛石对氨氮的饱和吸附量、吸附影响因素及其吸附动力学特点。结果表明:在T=303 K、p H=5.6条件下,氨氮初始浓度增至600 mg/L左右(接近原地浸矿工艺实际使用的最初浸矿剂浓度的1/2)时,埃洛石和矿区土壤对氨氮的吸附达饱和,饱和吸附量为1.66 mg/g左右;随NH_4~+-N初始浓度、p H值(3.0~6.0)、温度(288~313 K)的升高,埃洛石及矿区土壤对氨氮的吸附量增大;埃洛石对氨氮的吸附符合Langmuir等温方程和Freundlich等温方程,可近似认为离子型稀土矿区土壤对氨氮的吸附易于进行;埃洛石对氨氮的吸附过程符合准二级动力学方程。
[Abstract]:The pollution of ammonia nitrogen in the soil of the ion-type rare earth mining area in South China is becoming increasingly serious. It is one of the main clay components in the soil of the mining area. The saturated adsorption capacity of ammonia nitrogen, the influence factors and the adsorption kinetics of the ammonia nitrogen are studied. The results show that the initial concentration of ammonia nitrogen is increased to about 600 mg/L under the condition of T=303 K and P H=5.6. When the initial leaching concentration of 1/2 in the mining process was used, the adsorption of ammonia nitrogen was saturated in the soil of the rock and mine, and the saturated adsorption amount was about 1.66 mg/g; with the initial concentration of NH_4~+-N, P H value (3.0~6.0), the temperature (288~313 K), the adsorption capacity of the soil to ammonia nitrogen increased and the adsorption character of the ammonia nitrogen in the soil of the rock and ore area increased. The isothermal equation of Langmuir and the equation of Freundlich isotherm can approximate the adsorption of ammonia nitrogen in the soil of the ion type rare earth mining area, and the adsorption process of the NH3 to the ammonia nitrogen is in accordance with the quasi two order kinetic equation.
【作者单位】：中南大学冶金与环境学院;江西理工大学冶金与化学工程学院;
【基金】：Project(51674305)supported by the National Natural Science Foundation of China Project(1602FKDC007)supported by Science and Technology Program of Gansu Province,China Project(NSFJ2015-K06)supported by the Jiangxi University of Science and Technology,China
【分类号】：O647.3;X505

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