离子交换法脱除磷酸中锰离子的动态吸附研究

doi:10.11962/1006-4990.2020-0096

摘要/Abstract

摘要：

近年来离子交换技术在湿法磷酸净化领域得到了广泛的发展与应用。采用Sinco-430型阳离子交换树脂脱除磷酸中的锰离子,考察了流量、磷酸溶液初始锰浓度、温度对吸附效果的影响。结果表明：增大进液流量、提高溶液初始锰浓度以及升高温度均有利于缩短树脂饱和时间,但进液流量的增大会降低树脂的吸附率,而温度的升高则会降低树脂的饱和吸附量。在进液流量为4.0 mL/min、溶液初始锰质量浓度为10.22 mg/mL、体系温度为35 ℃的条件下,树脂对锰离子的饱和吸附量为64.76 mg/g、吸附效率为63.55%。采用Thomas,Yoon-Nelson和Yan 3种吸附模型对动态吸附过程数据进行拟合,发现Yan模型的拟合效果最佳,而且由其计算得出的饱和吸附量与实验测定值的相对偏差在6.93%~10.91%。

关键词: 离子交换, 锰离子, 磷酸, 动态吸附, 模型拟合

Abstract:

In recent years,ion exchange technology has been widely developed and applied in the purification of wet-process phosphoric acid.Sinco-430 cation exchange resin was used to remove manganese ions from phosphoric acid.The effects of in-flow rate,initial manganese concentration of phosphoric acid solution and temperature on the adsorption performance were investigated.The results showed that increasing inflow rate,initial manganese concentration and temperature were all con-ducive to shortening the saturation time of resin.However,the increase of inflow rate will reduce the adsorption rate of resin,and the increase of temperature will reduce the saturated adsorption capacity of resin.Under the conditions that the inflow rate was 4.0 mL/min,the initial manganese mass concentration of solution was 10.22 mg/mL and the temperature was 35 ℃,the saturated adsorption capacity of the resin for manganese ions was 64.76 mg/g,and the adsorption efficiency was 63.55%.Thomas,Yoon-Nelson and Yan dynamic adsorption model were used to fit the experimental data of dynamic adsorption pro-cess.It was found that the Yan model fitted best,and the relative deviation between the saturated adsorption capacity calcu-lated by the Yan model and the experimental value was 6.93%~10.91%.

Key words: ion exchange, manganese ion, phosphoric acid, dynamic adsorption, model fitting

中图分类号:

TQ137.12

庄海波,杨林,邓强,叶润州,吴赵敏. 离子交换法脱除磷酸中锰离子的动态吸附研究[J]. 无机盐工业, 2021, 53(1): 18-23.

Zhuang Haibo,Yang Lin,Deng Qiang,Ye Runzhou,Wu Zhaomin. Study on dynamic adsorption of Mn ²⁺ from phosphoric acid by ion exchange technology[J]. Inorganic Chemicals Industry, 2021, 53(1): 18-23.

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参考文献 18

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q/（mL·min^-1）	t_s/min	Q_e,exp/（mg·g^-1）	Y/%
2.5	80	56.50	68.57
4.0	64	65.69	62.33
5.0	52	57.94	54.02

C₀ /（mg·mL^-1）	t_s /min	Q_e,exp/（mg·g^-1）	Y/%
7.60	80	56.62	59.93
10.22	64	65.69	62.34
12.78	60	70.49	59.83

T/℃	t_s /min	Q_e,exp/（mg·g^-1）	Y/%
20	64	65.69	62.34
35	62	64.76	63.55
50	60	63.21	63.70

C₀/ （mg·mL^-1）	q/ （mL·min^-1）	T/ ℃	m/ g	Q_e,exp / （mg·g^-1）	Q_e,Th/ （mg·g^-1）	偏差/ %	k_Th / （mL·min^-1·mg^-1）	R²
10.22	2.5	20	22.50	56.50	60.71	7.45	0.013 16	0.953 2
10.22	4.0	20	22.52	65.69	70.06	6.66	0.016 40	0.962 0
10.22	5.0	20	22.47	57.94	63.50	9.61	0.021 24	0.985 0
7.60	4.0	20	22.52	56.63	64.16	13.31	0.017 90	0.992 7
10.22	4.0	20	22.52	65.69	70.06	6.66	0.016 40	0.962 0
12.78	4.0	20	22.57	70.49	75.84	7.59	0.013 66	0.991 2
10.22	4.0	20	22.52	65.69	70.06	6.65	0.016 40	0.962 0
10.22	4.0	35	22.56	64.76	68.53	5.82	0.016 45	0.958 7
10.22	4.0	50	22.42	63.21	66.32	4.92	0.016 57	0.951 8

C₀ / （mg·mL^-1）	q/ （mL·min^-1）	T/ ℃	m/ g	τ_exp / min	τ_cal / min	偏差/ %	k_YN / min^-1	R²
10.22	2.5	20	22.50	57.41	53.47	6.86	0.134 5	0.985 0
10.22	4.0	20	22.52	42.31	38.60	8.77	0.167 6	0.962 0
10.22	5.0	20	22.47	30.66	27.93	8.91	0.217 0	0.953 2
7.60	4.0	20	22.52	50.38	47.53	5.66	0.136 0	0.992 7
10.22	4.0	20	22.52	42.54	38.60	9.26	0.167 6	0.962 0
12.78	4.0	20	22.57	36.81	33.48	9.04	0.174 6	0.991 2
10.22	4.0	20	22.52	42.54	38.60	9.26	0.167 6	0.962 0
10.22	4.0	35	22.56	42.23	37.82	10.44	0.168 1	0.958 7
10.22	4.0	50	22.42	41.68	36.38	12.73	0.169 3	0.951 8

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