硫铁矿烧渣制复合聚铁混凝剂及其性能研究

Study on preparation and properties of poly ferric coagulant from pyrite cinder

以硫铁矿烧渣为原料,经还原、焙烧、酸浸得到较高浓度的硫酸亚铁溶液,以浓HNO_3为催化剂,通入氧气将酸浸液制成深棕红色粘稠混凝剂PFS,确定最佳反应条件:nH_2SO_4/nFe为0.2~0.35,催化剂投加量1.75%,通入氧气80℃反应2h。加入Na_2HPO_4,水浴加热制得复合混凝剂PPFS,最佳反应条件:nPO_4^(3-)/n Fe为0.3,反应温度70℃~80℃,反应时间1h。红外光谱分析显示,PFS、PPFS是以羟基连接为主的聚合物,将P引入PFS,PO_4^(3-)参与聚合,生成了高电荷高羟基多核络合物,形成多种结构单元,混凝时形成的絮体更大,对制药废水浊度、COD去除效果更好。

taking pyrite cinder as raw material, through reduction, roasting and acidic leaching, the high concentration ferrous sulfate solution was made. Then with a catalytic amount of concentrated HN03 ,the acidic leaching solution was bubbled into the oxygen and turned into the deep red brown viscous coagulant PFS. The optimum reaction conditions were detemiined：7iH2S04/nFe is 0. 2 - 0. 35 ,the catalyst dosing quantity is 1. 75% ,the reaction time is 2h with oxygen at 80 X^. T h e composite coagulant P P F S w a s m a d e by join the Na2HP04 on condition of the water bath heating,the best reaction conditions as follow：the nP042＇/n F e is 0. 3 , the reac-tion temperature is 70 to 80 ,the reaction time of lh. The infrared spectrum analysis showed that PFS,PPFS was mainly used for hydroxyl connection in polymer,when introducing P into PFS,the P043 will aggregate and generating more than high charge high hydroxyl nuclear complex,formed a variety of structural unit,the formed coagulation of floes is bigger,the water turbidity,the remov-al efficiency of COD is better for pharmaceutical waste.