氟、铝、硅杂质对石膏结晶过程的影响

Effect of Fluorine, Aluminium and Silicon on the Crystallization of Gypsum

在ＭＳＭＰＲ结晶器中研究了磷矿中的常见杂质铝、硅、氟对石膏结晶的影响。发现不同含量的氟、铝、硅存在下，石膏晶体的成核速率和成长速率存在一个极值点；电镜照片表明，只有铝存在时，石膏晶体的外形几乎没有变化；当氟与铝共存时，石膏晶体的外形发生了极大的变化，几乎都形成了球状聚晶；在氟、铝、硅杂质共存时，石膏晶体的形态与只有氟和铝存在时相似，但较不规则。

The effects of Al 3+ , SiF 2- 6 and F - on the crystal of gypsum in MSMPR crystallizer are studied. It is found that the growth and nucleation rates of gypsum crystal have a maximum value in the presence of variant amounts of fluorine, aluminium and silicon. The shape of gypsum crystal changes little in the presence of Al 3+ ion. In the presence of both Al 3+ and F -(HF), the shape of gypsum crystal changes greatly and forms sphere shaped aggregate instead of the elongated needle formed in the presence of Al 3+ ion; In the coexistence of F -, Al 3+ and SiF 2+ 6 ions, the gypsum crystal shape is similar to that in the presence of both F - and Al 3+ ions, but less regular.