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Chemical and Structural Changes of Raw Phosphate during Heat Treatment

机译：热处理过程中原始磷酸盐的化学和结构变化

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In the wet phosphoric acid production using calcined phosphate particles, physical structure and chemical composition of used material have an impact on the reaction speed. In this study, porous properties of phosphate fraction size 125-200 mu m after heating at different temperature between 240 deg C to 940 deg C were investigated. Fluorapatite, carbonate fluorapatite (Francolite), dolomite and calcite constitute the major minerals of the phosphate rock used. The results of TG/DTA, CRTA, IR and ESEM observations were used to understand the chemical changes observed. The decline of the specific surface area (SSA) from 16.61 m~2/g down to 0.81 m~2/g was interpreted according to the thermal results. The increasing of the linear shrinkage percent by sintering process is observed. This process begins near 240 deg C and reaches a maximum near 940 deg C. These results are in agreement with those in the literature. Some kinetic tests were undertaken at laboratory scale to elucidate the relationship between reactivity and porous properties of phosphate particles.
机译：在使用煅烧的磷酸盐颗粒的湿磷酸生产中，所用材料的物理结构和化学组成对反应速度有影响。在这项研究中，研究了在240到940℃之间的不同温度下加热后，磷酸盐级分125-200μm的多孔性能。氟磷灰石，碳酸盐氟磷灰石（Francolite），白云石和方解石构成了所用磷酸盐岩的主要矿物。 TG / DTA，CRTA，IR和ESEM观察结果用于了解观察到的化学变化。根据热结果解释了比表面积（SSA）从16.61 m〜2 / g下降到0.81 m〜2 / g。观察到通过烧结过程的线性收缩率增加。此过程开始于240摄氏度附近，最高达到940摄氏度。这些结果与文献中的结果相符。在实验室规模进行了一些动力学测试，以阐明磷酸盐颗粒的反应性与多孔性之间的关系。

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