磷酸蒸发浓缩助剂的实验研究

实验研究各种表面活性剂作为磷酸浓缩蒸发的助剂,用以提高水的蒸发强度,加入量只需磷酸质量的200×10-6,以TWEEN+NNO和TWEEN+GC效果较好。同时实验研究了各种阻垢剂,其中以SO-3和十二烷基苯磺酸钠最佳,对氟硅酸钾(钠)的阻垢率可达60%以上。湿法磷酸浓缩过程中同时加入上述表面活性剂,可提高蒸发强度,减少蒸汽用量,提高浓缩酸浓度,并有一定的阻垢作用。

Experimental study on the additives in phosphoric acid evaporation process

The varied surfactants are studied as the additives for the evaporation concentration of phosphoric acid to improve the water evaporation intensity, with the adding amount 200 × 10^-6 of phosphoric acid, the effects of TWEEN ＋ NNO and TWEEN ＋ GC are good. Meanwhile the varied scaling inhibitors are studied, the effects of SO-3 and sodium dodecyl benzene sulfonate （SDBS） are the best, the scaling inhibition rate on potassium （sodium） fluosilicate is more than 60%. In wet-process phosphoric acid concentration process, adding the above-mentioned surfactants can increase evaporation intensity, reducing the amount of steam, increasing acid concentration and having a certain scaling effect.