独居石脱除工业硫酸锌溶液中氟的吸附性能

来源期刊:中国有色金属学报2018年第9期

论文作者:赖延清 杨凯 郭伟昌 杨超 田忠良 张凯 李劼

文章页码:1893 - 1900

关键词:独居石;工业硫酸锌溶液;脱氟

Key words:Monazite; industrial zinc sulfate solution; defluorination

摘    要:采用独居石对工业硫酸锌溶液进行吸附脱氟,研究吸附时间、吸附温度、吸附剂添加量、pH等工艺参数对脱氟效果的影响,分析其吸附动力学及等温线特征,初步探讨独居石的脱氟机理。结果表明:独居石中的铈与工业硫酸锌溶液中氟的相互作用使氟得以脱除;采用独居石吸附脱氟符合伪一级动力学模型和Langmuir吸附等温线模型,其最大理论吸附容量可达5.29 mg/g;当工业硫酸锌溶液在温度70 ℃、吸附时间65 min、添加量为25 g/L、pH值为1时,氟的脱除率可达到46.06%,具有良好的脱氟效果。

Abstract: Monazite was employed to remove fluorine ions from industrial zinc sulfate solution. The different process parameters, such as adsorption time, adsorption temperature, dosage of adsorbent and pH, were studied. Kinetic and adsorption isotherm characteristics was analyzed and the mechanism of defluorination on monazite was explored preliminarily. The results indicate that fluorine ions are removed by interacting with equilibrium concentration on the surface of monazite. The kinetics data suggests that the process of adsorption can be described by the pseudo-first order kinetic model. The isotherm data are well fitted to the Langmuir isotherm models and the theoretical maximum adsorption capacity is 5.29 mg/g. It is the most efficient when the conditions are as follows: t=65 min, θ=70 ℃, ρ=25 g/L, pH=1. And under this condition, the efficiency can reach up to 46.06%.

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