聚合硫酸铁铝的制备及除磷性能研究

Abstract

Abstract:

A new resource preparation method for poly ferric-aluminous-sulphate（PAFS） by by-product acid from titanium dioxide industry by sulfuric acid method and red mud iron slag was introduced.The optimum parameters for the synthesis of PAFS had been confirmed as following: mass ratio of liquid to solid was 6:1,leaching-temperature was 105 ℃,and leachingtime was 80 min.Under these conditions,the dissolution rate of red mud iron slag reached 65.2%,and the mass fraction of total iron in the optimized synthetic aluminum ferric sulfate was 8.23%,the mass fraction of Al₂O₃ was 1.12%,and the salt base was 12.88%.At last,the performance of phosphorous removal of synthesized PAFS was compared with polymeric ferric sulfate（PFS） and polyaluminium chloride（PAC） available in the market.The obtained results showed that the synthesized PAFS displayed the highest phosphorous removal rate（95.45%） with the same addition dosage of 300 mg/L.

Key words: by-product acid, red mud, poly ferric-aluminous-sulphate, phosphorous removal

CLC Number:

TQ125.14

Dong Linhui,Li Yang,Zhou Xuefang,Zhou Yong,Zhu Wenyuan,Zhou Xiaofeng. Preparation of poly ferric-aluminous-sulphate（PAFS） and its performance in phosphorous removal[J]. Inorganic Chemicals Industry, 2019, 51(5): 57-60.

Figures/Tables 10

References 13

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液固比	w（全铁）/%	w（氧化铝）/%	盐基度/%
5:1	6.11	1.33	15.42
6:1	7.48	1.13	10.75
7:1	6.42	0.99	3.22
8:1	5.60	0.88	-5.06

溶出温度/℃	w（全铁）/%	w（氧化铝）/%	盐基度/%
95	5.58	1.01	6.53
100	5.90	1.06	7.29
105	7.52	1.09	11.34
110	7.56	1.04	12.01

溶出时间/min	w（全铁）/%	w（氧化铝）/%	盐基度/%
40	7.09	1.10	10.18
60	7.46	1.08	10.79
80	8.23	1.12	12.88
100	8.30	1.14	11.52

投加量/ （mg·L^-1）	市售聚合硫酸铁		聚合硫酸铁铝（自制）		市售聚合氯化铝
投加量/ （mg·L^-1）	出水TP/ （mg·L^-1）	出水TP 去除率/ %	出水TP/ （mg·L^-1）	出水TP 去除率/ %	出水TP/ （mg·L^-1）	出水TP 去除率/ %
150	1.78	78.71	0.94	88.76	2.21	73.56
200	1.39	83.37	0.66	92.11	1.83	78.11
250	0.92	89.00	0.52	93.78	1.46	82.54
300	0.67	91.99	0.38	95.45	0.92	89.00

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Preparation of poly ferric-aluminous-sulphate（PAFS） and its performance in phosphorous removal

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