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以羟基氧化锆粉末为原料,制备颗粒羟基氧化锆,评价了颗粒羟基氧化锆对溶液中F-的吸附性能。结果表明:颗粒羟基氧化锆除氟过程符合Freundlich吸附等温线模型和拟二级动力学模型,F-的吸附过程包括液膜扩散和颗粒内的孔扩散;pH在3～4时,颗粒羟基氧化锆的氟吸附量达到最大值27.72 mg/g,其他范围内pH的升高或降低都会导致氟吸附量的降低;Cl-对颗粒羟基氧化锆除氟过程无明显影响,而SO24-和PO34-对颗粒羟基氧化锆除氟过程影响较大,且浓度越高影响越大;扫描电镜和X射线能谱测试结果显示颗粒内随着颗粒深度的增加,F-含量逐渐降低,F-在颗粒内部的传质过程受到阻碍,SO24-和PO34-对颗粒羟基氧化锆除氟的干扰作用主要发生在颗粒表面。
Hydroxylzirconium oxide powder as raw material, the preparation of particulate zirconium oxyhydroxide, the evaluation of the particulate zirconium oxide solution F - adsorption properties. The results showed that the process of removing fluorine from granular zirconia was in accordance with the Freundlich adsorption isotherm model and the pseudo-second order kinetic model. The adsorption process of F- consisted of liquid film diffusion and intra-particle diffusion. At pH 3-4, The maximum fluorine adsorption capacity of zirconium reaches 27.72 mg / g, the increase or decrease of pH in other ranges will lead to the decrease of fluorine adsorption capacity; Cl- has no significant effect on the fluorine removal process of particulate hydroxy zirconia, while SO24- and PO34- The results showed that the F-content decreased gradually with the increase of the particle depth and the F-content in the particles decreased with the increase of the concentration. The results of scanning electron microscopy and X- Of the mass transfer process is hindered, SO24- and PO34-interference of particulate hydroxy zirconia fluoride removal occurs mainly in the particle surface.