无机高分子絮凝剂PSAFC的制备及其性能的研究

Study on Preparation and Performance of PSAFC

以粉煤灰为主要原料,采用共聚法制备了一种无机高分子絮凝剂—聚合硅酸铝铁(PSAFC)。分别研究了焙烧温度、m(NaF):m(粉煤灰)、溶出温度、盐酸浓度及溶出时间对粉煤灰中Al3+溶出率的影响以及碱化度、Al3+含量、Fe3+含量对其絮凝性能的影响。结果表明:当焙烧温度为900℃,m(NaF):m(粉煤灰)为0.20,溶出温度为105℃,盐酸浓度为20%,溶出时间为2h时,粉煤灰中Al3+的溶出率达到最大值41.5%;碱化度B*、铁含量和硅含量对PASFC的絮凝性能均有较大影响,当碱化度为0.8,Al/Fe物质的量比为10:4,Al/Si物质的量比为10:2时,PSAFC的絮凝性能最佳。

A kind of Inorganic polymer flocculant, polysilicate aluminum ferric was synthesized by copolymerization method with using fly ash as main material. The effects of factors such as calcination temperature, m（NaF）：m（fly ash ）, digestion temperature, hydrochloric acid concentration and time on the Al^3＋ dissolution from fly ash were studied, and the effects of exchangeable sodium percentage, Al^3＋ content, Fe^3＋ content on the flocculation performance of PSAFC were discussed. The results showed that the dissolution rate of Al^3＋ was 41.5% when the calcination temperature was 900℃,m （NaF）：m （fly ash）=0.20, digestion temperature was 105℃, hydrochloric acid concentration was 20%, and time was 2h. The exchangeable sodium percentage, Al^3＋, Fe^3＋ and Si content had influence on the flocculation performance of PSAFC, and it was optimal when the exchangeable sodium percentage was 0.8, M（Al）：M（Fe） =10：4, M（Al）：M（Si） =10：2.