Is polyaluminum ferric chloride an inorganic coagulant?

1. Introduction Polyaluminum ferric chloride (PAFC) is an efficient inorganic polymeric coagulant [1], [2]. Many studies [3], [4], [5] have demonstrated that inorganic polymeric coagulants were more effective than conventional inorganic coagulating salts in coagulation due to their resistances to the influence of wastewater initial pH.

What is poly aluminum-ferric chloride (PAFC)?

Author to whom correspondence should be addressed. Poly aluminum-ferric Chloride (PAFC) is a new type of high efficiency coagulant. In this study, high iron type gangue is used as a main raw material. It is calcined at 675 °C for 1 h and 3% CaF 2 is added to the calcined powder and reacted with 20% hydrochloric acid at 93 °C for 4 h.

How is PAFC prepared?

PAFC is prepared by microwave synthesis with a shortened time of 5 min and the conditions of preparation are optimized. Its performance is better than that of the commonly used polymeric aluminum chloride (PAC) and polymeric iron chloride (PAF).

How is PAFC synthesized?

PAFC was synthesized following two steps: First, 50 g of blast furnace dust was placed in a 500 mL three-necked round bottom flask equipped with stirrer and reflux device. Then, 2 g NaF, 150 mL of HCl diluted solution (36%, freshly diluted 1:1 with ultrapure water) and 5 mL of HNO 3 were added.

What is PAFC from coal gangue?

The XRD and FT-IR spectra showed that the prepared product is a mixture of PAFC with different degrees of polymerization. The preparation of PAFC from coal gangue can realize the resource utilization of gangue. It is mainly used for the treatment of coal industrial wastewater and the treated water can be recycled.

How to extract (Al + Fe) B species from PAFC?

The mixture solution of ethanol, propylene glycol, and acetone could be used as precipitation solvents to extract the (Al + Fe) b species from PAFC. The optimal separation and purification conditions were organic solvents volume ratio = 2:1:7 and the middle organic solvents dosage V2 = 100 mL ( V1 = V3 = 50 mL, for 10 mL of 0.3 M PAFC solution).