Effect of Carbonation on Combined Treatment of Phosphorus andFluorine by Thermally Decomposed Dolomite

Abstract

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

CLC Number:

X703.1

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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