Ca_2SiO_4和NaFeO_2的反应和铝酸盐熟料配方的优化

REACTION BETWEEN Ca_2SiO_4 AND NaFeO_2 AND OPTIMIZATION OF COMPOSITION OF SINTER IN ALUMINA PRODUCTION

用X射线衍射(XRD)和红外吸收光谱(IRS)研究了Ca_2SiO_4—NaFeO_2系的反应产物,证明其中含CaFe_2O_4和Na_4Ca_8(SiO_4)_5。热力学计算表明Ca_2SiO_4-NaFeO_2不是互易系的稳定对Na_4Ca_8(SiO_4)_5和铝酸钠溶液作用生成Ca_3[Al(OH)_6]_2(或其固溶体),使熟料Al_2O_3溶出率降低。用模式识别方法从工业生产技术记录中总结出熟料配方优化数学模型,并给出理论解释。

The reaction product of Ca_2SiO_4-NaFeO_2 system has been investigated by X-ray diffraction and IR spectroscopy. The product contains CaFe_2O_4 and Na_4Ca_8(SiO_4)_5. Thermodynamical estimation also confirms that Ca_2SiO_4+NaFeO_2 is not the stable pair of the reciprocal salt pairs of Ca, NaSiO_4, FeO_2 system. In the reactions between Na_4Ca_8(SiO_4)_5 and sodium aluminate solution there forms Ca_3[Al(OH)_6]_2 (or its solid solu- tion) which will decrease the recovery of alumina. Based on the abovementioned facts, the mathematical model for the optimization of the composition of sinters in alumina production has been explained.