Abstract:Using coal gangue as raw material, high-efficiency inorganic polymer flocculant polyaluminum iron calcium chloride (PAFCC) was prepared through high-temperature roasting, acid precipitation, polymerization, and maturation. And UV254 removal rate. The test showed that the coagulant prepared at pH=2, the polymerization temperature was 60 ℃, the polymerization time was 5 h, and the coagulant prepared at 40 ℃ for 28 h was the best. The coagulation results showed that the prepared PAFCC had excellent removal effect on turbidity, reaching 95.70%, and had a certain removal effect on COD and UV254, and the removal rates reached 47.51% and 45.98%, respectively. The coagulation results of the refining wastewater showed that PAFCC had a good removal effect on turbidity and total phosphorus, while it had a certain removal effect on COD and ammonia nitrogen, and the effect was significantly better than traditional PAC.