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首页> 中文期刊> 《华南农业大学学报》 >吉林省临江硅藻土及其尾矿对钾的吸附性能

吉林省临江硅藻土及其尾矿对钾的吸附性能

         
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摘要

[Objective] To reveal the potassium ( K+) adsorption properties of diatomite and tailings from Linjiang, Jilin Province, and provide theoretical basis for the development and utilization of diatomite and tailings as soil K+ regulation materials. [Method]High quality diatomite raw ore and tailings were col-lected in Linjiang, their chemical and mineral compositions were analyzed, and their K+ adsorption and desorption characteristics were studied by static equilibrium adsorption method.[Result]The high quality diatomite and tailings were considerably different in their SiO2 contents which were 78. 57% and 89. 29%respectively. Both were mainly composed of amorphous opal, yet only tailings contain some impurities such as quartz, kaolinite, mica and organic matter. The kinetic adsorptions of K+ by both high quality diatomite and its tailings were in accordance with pseudo two order kinetics model. The thermodynamic adsorptions of K+ by both were consistent with the Freundlich isotherm adsorption equation, and the ad-sorption reactions were easy to carry out. The K+desorptions by both were consistent with the Elovich e-quation. The K+desorption rates and the logarithmic values of reaction time ( Lnt) were well linearly cor-related before the desorption process reached equilibrium for both the high quality diatomite and tailings.[Conclusion] Diatomite tailings are mainly composed of amorphous opal, and has certain capacity of K+adsorption and desorption.%【目的】揭示吉林省临江硅藻土及其尾矿对钾的吸附性能,为开发和利用硅藻土尾矿作为土壤钾肥肥力调控物质提供理论依据。【方法】以临江优质硅藻土原矿及尾矿为研究对象,在对其化学组成和矿物组成进行分析的基础上,采用静态平衡吸附法研究了优质硅藻土及其尾矿对K+的吸附、解吸特性。【结果】硅藻土尾矿与优质硅藻土相比,SiO2质量分数有较大差异,分别为78．57%和89．29%；两者的矿质组成均以非晶质蛋白石为主,同时尾矿比优质硅藻土含有更多的石英、高岭石、云母及有机质等杂质；优质硅藻土及其尾矿对K+的动力学吸附均符合伪二阶动力学模型；对K+的热力学吸附均整体符合Freundlich等温吸附方程,吸附反应容易进行；对K+的解吸均符合Elovich方程；2种硅藻土解吸过程达到平衡之前,K+的解吸率与反应时间的对数( lnt)均存在良好的线性关系。【结论】硅藻土尾矿的矿物组成以非晶质蛋白石为主,对钾具有一定的吸附解吸能力。

著录项

  • 来源
    《华南农业大学学报》 |2016年第5期|50-56|共7页
  • 作者

    高将; 赵兰坡; 荣立杰; 姜亦梅; 刘胜楠; 李昕;

  • 作者单位

    吉林农业大学 资源与环境学院/吉林省商品粮基地土壤资源可持续利用重点实验室;

    吉林 长春130118;

    吉林农业大学 资源与环境学院/吉林省商品粮基地土壤资源可持续利用重点实验室;

    吉林 长春130118;

    吉林农业大学 资源与环境学院/吉林省商品粮基地土壤资源可持续利用重点实验室;

    吉林 长春130118;

    吉林农业大学 资源与环境学院/吉林省商品粮基地土壤资源可持续利用重点实验室;

    吉林 长春130118;

    吉林农业大学 资源与环境学院/吉林省商品粮基地土壤资源可持续利用重点实验室;

    吉林 长春130118;

    吉林农业大学 资源与环境学院/吉林省商品粮基地土壤资源可持续利用重点实验室;

    吉林 长春130118;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 非金属矿产;钾肥;
  • 关键词

    硅藻土; 尾矿; 钾; 吸附动力学; 解吸;

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