硅藻土湿法物理提纯工艺研究
投稿时间:2014-01-21  修订日期:2014-04-28  点此下载全文
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作者单位E-mail
杨小平 中国矿业大学(北京)化学与环境工程学院 yxp@cumtb.edu.cn 
孙志明 中国矿业大学北京化学与环境工程学院  
郑水林 中国矿业大学北京化学与环境工程学院  
张雁鸣 临江嘉合康宁硅业有限公司  
基金项目:“十二五”国家科技支撑计划项目(编号:2011BAB03B07)
中文摘要:针对优质硅藻土资源日益减少的现状,提出一种对资源丰富的中低品位含黏土类杂质的硅藻原土进行提纯的湿法物理分选工艺。分析了硅藻土原矿的化学成分、矿物成分和粒度组成,研究了硅藻颗粒和黏土矿物蒙脱石的表面电位与pH值和分散剂用量之间的关系,确定了硅藻土矿浆最佳的擦洗和分散条件,利用硅藻与黏土矿物之间的粒度差异和表面电位差异,原矿经充分分散后,借助离心力场中硅藻和黏土矿物颗粒之间显著的沉降速度差异,实现高效的分选。实际生产表明,硅藻原土经分选后,SiO2含量由81.78%提高到86.86%,Al2O3含量由5.49%下降到3.45%,Fe2O3含量由2.01%下降到1.42%,达到了一级硅藻土标准。
中文关键词:硅藻土  物理提纯  擦洗  分散  层流离心分选机
 
Research on the wet physical purification process of diatomite
Abstract:To face the challenge of the superior diatomite resources getting rare, we proposed a wet physical separation process, by which the resourceful clayey diatomite of a middle or low grade was purified to a high grade. The chemical constituent, mineral composition and particle-size distribution of the raw diatomite were analyzed. The co-relation of the surface potential of the diatomite and montmorillonite with pH value and dispersant dosage was investigated. The optimal condition to scrub and disperse the diatomite slurry was determined. The raw diatomite slurry was completely dispersed according to the size and surface potential difference between the diatomite and the clayey minerals. The efficient separation was thus obtained in the centrifugal force field to enhance the sedimentation velocity difference between the diatom and the clay mineral particles. The actual production results show that the diatomaceous concentrate has reached the first grade standard of diatomite through the separation process with the change of SiO2 content from 81.78% to 86.86%, Al2O3 content from 5.49% to 3.45% and Fe2O3 content from 2.01% to 1.42%.
keywords:diatomite  physical purification  scrubbing  dispersion  laminar-flow centrifugal separator
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