粉煤灰制聚合氯化铝铁和白碳黑新工艺

采用粉煤灰制备聚合氯化铝铁和白碳黑.该法共分一次酸浸、碱溶、焙烧、二次酸浸4个阶段.实验确定的最佳工艺条件为:一次酸浸阶段酸溶温度100℃,碱溶阶段m(氢氧化钠):m(活化高硅渣)=0.6,二次酸浸阶段m(碳酸钠):m(灰渣A)=0.8、盐酸质量分数20%.在此条件下Fe~(3+)和Al~(3+)的总浸出率分别为96.54%和86.67%.主要产品聚合氯化铝铁的质量符合GB15892-2003<水处理剂聚氯化铝>的标准;产品白碳黑的质量符合GBl0517-89<沉淀二氧化硅>的标准.

New Process for Preparation of Poly Aluminum Ferric Chloride and White Carbon Black from Fly Ash

Fly ash was used to prepare poly aluminum ferric chloride and white carbon black. The 4 stages of the process are as follows: acid leaching, alkali dissolution, roasting and secondary acid leaching. The optimum conditions are as follows; 100 t for first acid leaching stage, m(NaOH) : m(activated high content silica residue) =0. 6 for alkali dissolution stage, m(Na_2CO_3) : m( clinker A) =0.8 and 20% of HCl mass fraction for the secondary acid leaching stage. Under these conditions, the total leaching efficiencies of Fe~(2+) and Al~(3+) are 96.54% and 86.67% , respectively. The quality of the main product poly aluminum ferric chloride and white carbon black can meet the national standards of GB15892 -2003 and GB10517 -89, respectively.