粒径大小对含钾矿物钾素释放的影响  

Effects of different particle size on potassium release of K-bearing minerals

作　　者：朱丹丹 王瑾[1] 丛日环[1] 李小坤[1] 

机构地区：[1]华中农业大学农业部长江中下游耕地保育重点实验室,武汉430070

出　　处：《华中农业大学学报》2018年第1期64-68,共5页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金项目(41571284)

摘　　要：将含钾矿物(包括黑云母、白云母和正长石)研磨成粒径分别为251~840、151~250、74~150及<74μm的颗粒,采用10mmol/L酒石酸和10mmol/L草酸连续振荡浸提的方法,研究粒径对含钾矿物钾素释放的影响。结果表明:与粒径为251~840μm颗粒相比,粒径为151~250、74~150及<74μm的黑云母经过酒石酸和草酸浸提后的钾素释放量分别增加-9%、34%、129%和-21%、20%、152%;白云母经过酒石酸和草酸浸提后的钾素释放量分别增加246%、495%、566%和288%、511%、610%;正长石经过酒石酸和草酸浸提后的钾素释放量分别增加32%、167%、417%和182%、675%、1 687%。白云母和正长石中钾素的释放量随粒径的减小显著增加,黑云母则随粒径的减小呈先减少后增加趋势。Different K-bearing minerals including biotite,muscovite and orthoclase were ground to 251-840μm, 151-250μm, 74-150 μm and 〈74 μm, and continuously extracted with tartaric acid and oxalic acid to study potassium release and its kinetics. Results showed that compared with 251-840 μm particle size,the release rate of biotite with particle size of 151--250 μm, 74-150 μm and 〈74 μm in- creased by -- 9%, 34%, 129% and-- 21%,20%,152%, respectively; the release rate of muscovite in- creased by 246%,495%,566% and 288%,511%, 610%,respectively; the release rate of orthoclase in creased by 32%, 167% ,417% and 182%,675%,1 687%, respectively. It is indicated that the amount of potassium released from muscovite and orthoclase increased significantly with the decrease in particle size, while that of biotite decreased first and then increased with the decrease in particle size.

关 键 词：小分子有机酸 粒径 含钾矿物 钾素释放 土壤肥力 

分 类 号：S158.2[农业科学—土壤学]