熟料溶出二次反应抑制机制研究

Inhibition Mechanism of Secondary Reaction in Clinker Leaching Process

研究了焦磷酸钠、十二烷基苯磺酸钠(SDBS)、草酸钠、柠檬酸钠、EDTA、氨三乙酸(NTA)等抑制剂对熟料溶出过程中二次反应的影响。结果表明:熟料溶出过程中,添加0.5%十二烷基苯磺酸钠后,Al2O3溶出率提高了1.84%,二次反应抑制效果最好。红外光谱分析结果表明,铝酸钠溶液中添加的十二烷基苯磺酸钠与赤泥中硅酸二钙之间主要是通过化学吸附发生作用,十二烷基苯磺酸钠因覆盖在赤泥表面而抑制二次反应发生。

The effection of six inhibitors, such as sodium pyrophosphate, sodium dodecye benzene sulfonate（SDBS）, sodium oxalate, sodium citrate, EDTA and NTA, on secondary reaction in alumina leaching process are investigated. The results show that comparing with non-inhibitors, the leaching rate of alumina improves 1.84%after adding 0.5%SDBS. SDBS inhibit effect is better than other inhibitors. The results of infrared spectrum and adsorption mechanism analysis reveal that compound of SDBS with dicaicium silicate covers the surface of red mud particle by chemical adsorption, further prevent occurrence of secondary reaction in sodium solution.