Mechanism of Silica and K-feldspar as Flux Agents in Phosphate Ore Carbothermic Reduction

被引：0

作者：

Li Y. ^{[1
,2
]}

Xia J.-P. ^{[1
,2
]}

Liu H.-L. ^{[1
,2
]}

Cao R.-F. ^{[1
,2
]}

机构：

[1] Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming

[2] The Higher Educational Key Laboratory for Phosphorous Chemical Engineering of Yunnan Province, Kunming University of Science and Technology, Kunming

来源：

Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2017年 / 31卷 / 05期

关键词：

Electric furnace; Fluxing agent; K-feldspar; Silica; Yellow phosphorus;

D O I：

10.3969/j.issn.1003-9015.2017.05.014

中图分类号：

学科分类号：

摘要：

Effects of reaction temperature and reaction time on phosphorus conversion were investigated using silica and potassium feldspar as flux agents. The results show that phosphorus conversion with K-feldspar was higher than that of silica. Thermodynamics and kinetics of the phosphate rock reduction process were studied by HSC-5 thermodynamics software and thermogravimetric analysis (TGA). The results demonstrate that when using K-feldspar, the operating temperature of yellow phosphorus and the activation energy is 215℃ and 3.2 kJ·mol-1 lower than that of silica, respectively, which indicates that K-feldspar can save energy and reduce cost. The residue was analyzed by XRD. The results indicate that K-feldspar as a flux agent is better than silica. The reason is mainly because K-feldspar decomposition can release highly reactive SiO2, and Ca5(PO4)3F can be decomposed at low temperature. Moreover, alkali metals are involved to lower eutectic formation temperature which facilitates main reactions. © 2017, Editorial Board of “Journal of Chemical Engineering of Chinese Universities”. All right reserved.

引用

页码：1120 / 1126

页数：6

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