【作者】 李艳；

【导师】 孙伟；

【作者基本信息】 中南大学 ， 矿物加工工程， 2009， 硕士

【摘要】 本文利用改进的Hallimond管采用电解浮选法研究不同粒级的微细粒高岭石浮选行为。详细考察了在电流强度、阴极孔径等电解条件和捕收剂种类、捕收剂用量、pH值等浮选条件改变的情况下,引起的气泡大小和气泡量的改变对气泡与三种不同粒级高岭石颗粒相互作用的影响。并通过高速摄影仪和颗粒捕集概率的拟合对试验中气泡与颗粒相互作用体系做了更深入的研究。结果表明,电流强度和阴极孔径显著影响高岭石浮选累计回收率。当电流强度从50mA增加到150mA时,气泡量增加,同时气泡尺寸减小,浮选速率常数K将会增大,理论回收率R也会随之增大,试验中三种粒度的高岭石浮选累计回收率均随电流强度的增大而增大;当阴极孔径从38μm增大到420μm时,气泡尺寸增大,而且当电流强度一定时,随着阴极孔径的增大,高岭石粒度越大浮选效果越好;捕收剂由DDA变为1227时,高岭石浮选效果变化不大;当1227浓度从2×10^-5mol/L增加到1×10^-4mol/L时,大气泡减少,气泡更为均匀,三种粒度的高岭石浮选累计回收率均有所上升;当pH从4升高到10时,气泡尺寸迅速减小,随着浮选溶液的pH升高,三种粒级的高岭石浮选累计回收率有不同程度的降低,但是当pH为10时细颗粒的浮选累计回收率比粗颗粒的高。颗粒粒度和气泡尺寸有一个最佳匹配范围,在此范围内,捕集概率达到最高。三种粒度的高岭石与电解气泡尺寸也存在一个最佳匹配值,在这里该粒度的高岭石浮选累计回收率达到最高:当电流强度为150mA时,0～36μm的高岭石在阴极孔径为38μm时浮选效果最好,浮选累计回收率达到84%;38～45μm的高岭石在阴极孔径为50μm时浮选效果最好,浮选累积回收率达到81%;45～74μm的高岭石在阴极孔径为74μm时浮选累计回收率达到77%。本论文是在“国家自然科学基金—（50674103）”的资助下完成的,旨在通过对气泡与粘土矿物的相互作用研究为铝土矿反浮选领域提供理论依据。更多还原

【Abstract】 The electro-flotation of kaolinite particles of different size fraction were studied in a modified hallimond tube.The paper study on the influence of bubble property which changed with electrolysis conditions such as current intensity and cathode aperture and flotation conditions including reagent species, reagent concentration and pH on the interaction between bubble and kaolinite particles of different size fraction. Furthermore, the paper did more thorough study on the system of particle-bubble interaction by High speed CCD and fitting of particle acquisition probability.Results show that current intensity and cathode aperture had significant effect on the cumulative recovery of kaolinite. As the current intensity increased from 50mA to 150mA,bubble amount increased while bubble size decreased,so flotation rate constant K and theoretical recovery R increased.The flotation cumulative recovery of kaolinite of three size fraction increased with current intensity in the experi-ment.Bubble size increased when cathode aperture increased from 38μm to 420μm. At a certain current intensity, the larger the cathode aperture, the more coarse the particle size,and the better the flotation effect. When the reagent was changed from DDA to 1227, kaolinite flotation effect changed slightly.As the concentration increased from 2×10^-5mol/L to 1×10^-4mol/L, large bubbles decreased and the bubble size became more even. The cumulative recovery of kaolinite increased meanwhile.As pH increased from 4 to 10,bubble size decreased rapidly.The cumulative recovery of kaolinite decreased as pH increased.And the cumulative recovery of fine particle was higher than the coarse’s at pH=10.There was an optimum match between particle size and bubble size.The best acquisition probability was found in the specific range.The optimum match in the experiment was as follows:When the current was 150mA,the flotation of 0～36μm is efficient in the aperture of 38μm and the cumulative recovery reached 84%:the flotation of 38～45μm is efficient in the aperture of 50μm and the cumulative recovery reached 81%: the flotation of 45～74μm is efficient in the aperture of 74μm and the cumulative recovery reached 77%.The research was supported by "National Natural Science Foundation—（50674103） "of China.更多还原