外加剂对磷石膏还原性分解过程的影响

Effect of Additives on the Process of Reductive Decomposition of Phosphogypsum

采用非等温热重法在３０～１２００℃内研究了外加剂（ＳｉＯ２，Ｆｅ２Ｏ３，ＣａＣｌ２，ＣａＯ，ＮａＣｌ，Ｎａ２ＳｉＦ６，Ｎａ２ＣＯ３）在含３％的还原性气体介质中对磷石膏及其配合料的热分解过程的影响。试验结果表明，ＣａＣｌ２，Ｆｅ２Ｏ３和ＳｉＯ２及其复合型外加剂促进了分解过程，对降低分解温度和提高分解速率作用较显著，可供进一步优选加速磷石膏及其配合料热分解过程的外加剂参考。

When phosphogypsum and its mixture were treated with reductive gas medium containing 3% CO at 30-1200℃ by using continuous thermogravimetric analysis, the effect of various additives (SiO 2,Fe 2O 3,CaCl 2,CaO,NaCl,Na 2SiF 6,Na 2CO 3,etc.) on the process of thermochemical decomposition was studied. The result indicted that the decomposition temperature was decreased and the decomposition rate was increased. And this was caused by the additives (SiO 2,Fe 2O 3,CaCl 2,and their compounds) which promoted the decomposition process.