| 光谱学与光谱分析 |
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| Study on the Influence of Mineralizer on the Preparation of Calcium Aluminates Based on Infrared Spectroscopy |
| FAN Wei1, WANG Liang1, ZHENG Huai-li1, 2*, CHEN Wei1, TANG Xiao-min1, SHANG Juan-fang4, QIAN Li3 |
| 1. Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China2. National Centre for International Research of Low-Carbon and Green Buildings，Chongqing University，Chongqing 400045，China3. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China4. Bachelor of Biological and Chemical Engineering, Yinbin Vocational and Technical College, Yibin 644003，China |
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Abstract In this study, effect of mineralizer on the structure and spectraproperties of calcium aluminates formation was extensively studied. Medium or low-grade bauxite and calcium carbonate were used as raw material and mineralizer CaF2 as additive. Calcium aluminates can be obtained after mixing fully, calcination and grinding. The prepared calcium aluminates can be directly used for the production of polyaluminiumchloride (PAC), polymeric aluminum sulfate, sodium aluminate and some other water treatment agents. The calcium aluminates preparation technology was optimized by investigating the mass ratio of raw materials (bauxiteand calcium carbonate) and mineralizer CaF2 dosage. The structure and spectra properties of bauxite and calcium aluminates were characterized by Fourier transform infrared(FTIR) spectroscopy analysis and the mineralization mechanism of the mineralizer was studied. FTIR spectra indicated that the addition of mineralizer promoted the decomposition and transformation of the diaspore, gibbsite and kaolinite, the decomposition of calcium carbonate, and more adequately reaction between bauxite and calcium carbonate.In addition, not only Ca in calcium carbonate and Si in bauxite were more readily reacted, but also Si—O, Si—O—Al and Al—Si bonds in the bauxite were more fractured which contributed to the release of Al in bauxite, and therefore, the dissolution rate of Al2O3 could be improved. The dissolution rate of Al2O3 can be promoted effectively when the mineralizer CaF2 was added in a mass ratio amount of 3%. And the mineralizer CaF2 cannot be fully functioned when its dosage was in a mass percent of 1.5%. Low-grade bauxite was easier to sinter for the preparation of calcium aluminates comparing with the high-grade one. The optimum material ratio for the preparation of calcium aluminates calcium at 1 250 ℃ was: the mass ratio between bauxite and calcium carbonate of 1∶0.6 and mineralizer CaF2 mass ratio percent of 3%.
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Received: 2014-04-19
Accepted: 2014-08-12
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Corresponding Authors:
ZHENG Huai-li
E-mail: zhl@cqu.edu.cn
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