(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 采用獨(dú)居石對(duì)工業(yè)硫酸鋅溶液進(jìn)行吸附脫氟，研究吸附時(shí)間、吸附溫度、吸附劑添加量、pH等工藝參數(shù)對(duì)脫氟效果的影響，分析其吸附動(dòng)力學(xué)及等溫線特征，初步探討?yīng)毦邮拿摲鷻C(jī)理。結(jié)果表明：獨(dú)居石中的鈰與工業(yè)硫酸鋅溶液中氟的相互作用使氟得以脫除；采用獨(dú)居石吸附脫氟符合偽一級(jí)動(dòng)力學(xué)模型和Langmuir吸附等溫線模型，其最大理論吸附容量可達(dá)5.29 mg/g；當(dāng)工業(yè)硫酸鋅溶液在溫度70 ℃、吸附時(shí)間65 min、添加量為25 g/L、pH值為1時(shí)，氟的脫除率可達(dá)到46.06%，具有良好的脫氟效果。
關(guān)鍵字: 獨(dú)居石；工業(yè)硫酸鋅溶液；脫氟
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
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%.
Key words: Monazite; industrial zinc sulfate solution; defluorination
