碳酸化对白云石热分解产物联合除磷除氟的影响

摘要/Abstract

摘要： 本文主要研究一种新型吸附剂的制备,及其对磷、氟废水的联合处理。以白云石为原材料,经煅烧和碳酸化处理后,通过XRD、XRF、SEM、FTIR等对其产物组成、形貌等进行表征,同时探究了反应时间、初始磷和氟浓度、固液比、pH值等环境参数对联合除磷除氟的影响。结果表明:随着固液比增大,剩余氟离子浓度逐渐降低后趋于稳定;动力学结果表明氟离子的去除更加符合准二级动力学方程(R²>0.967);溶液初始pH值对实验结果影响不显著;Langmuir等温吸附模型可以更好地描述氟离子去除过程。煅烧-碳酸化白云石(CCD)联合除磷除氟的机理为:CCD与溶液中的磷发生反应,生成羟基磷灰石,然后OH^-被F^-取代,转化生成氟磷灰石;同时CCD溶出的Ca²⁺、Mg²⁺也与F^-反应生成相应的沉淀。

关键词: 白云石, 碳酸化, 除磷, 除氟, 氟磷灰石

Abstract: The preparation of a new type of adsorbent and its combined treatment of phosphorus and fluorine wastewater were studied. Using dolomite as raw material, after calcination and carbonation, the composition and morphology of the products were characterized by XRD, XRF, SEM, FTIR, etc. The effects of environmental parameters such as reaction time, initial phosphorus and fluorine concentration, solid-liquid ratio, pH value on the combined treatment of phosphorus and fluorine were investigated. The results show that with the increase of solid-liquid ratio, the residual fluoride concentration tends to be stable after decreasing. The removal kinetic offluoride ions follows the pseudo-second-order model (R²>0.967). The initial pH value of the solution has no significant effect on the experimental results. The Langmuir isotherm adsorption model can better describe the fluoride removal process. The mechanism of calcination-carbonation dolomite (CCD) combined treatment of phosphorus and fluorine is as follows: CCD reacts with phosphorus to form hydroxyapatite, and then OH^- is replaced by F^- to transform into fluoroapatite; at the same time, the dissolved Ca²⁺ and Mg²⁺ from CCD react with F^- to form corresponding products.

Key words: dolomite, carbonation, dephosphorization, defluorination, fluoroapatite

中图分类号:

X703.1

王凌凯, 陈冬, 刘海波, 陈天虎, 邹雪华, 余韵青. 碳酸化对白云石热分解产物联合除磷除氟的影响[J]. 硅酸盐通报, 2021, 40(9): 3053-3063.

WANG Lingkai, CHEN Dong, LIU Haibo, CHEN Tianhu, ZOU Xuehua, YU Yunqing. Effect of Carbonation on Combined Treatment of Phosphorus andFluorine by Thermally Decomposed Dolomite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 3053-3063.

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