以PAC为原料制备锂吸附剂及其吸附性能的研究

doi:10.11962/1006-4990.2019-0190

Abstract

Abstract:

The adsorbent prepared with poly aluminum chloride（PAC） as raw material was studied.Under the optimal condi-tions,the maximum adsorption capacity of the adsorbent was 6.1 mg/g,and the pH of the suitable adsorption solution was at 3~5.Results showed that the absorbent had good selectivity on the Li-Ca system,the lithium ions and calcium ions were sep-arated very well,and the desorption rate reached 40.58%.The research on adsorption mechanism showed that the structure of the adsorbent did not change significantly before and after adsorption.During the adsorption and desorption process,lithium ions were intercalated and desorbed,and the intercalation and deintercalation were because of the ion exchange between lithium ions and hydrogen ions.

Key words: PAC, adsorbent, lithium

CLC Number:

TQ124.4

Zhang Wending,Deng Xiaochuan,Zhu Chaoliang,Fan Faying,Zhang Yi,Qing Binju. Preparation of lithium adsorbent from PAC and its adsorption properties[J]. Inorganic Chemicals Industry, 2020, 52(2): 12-16.

Figures/Tables 14

References 8

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溶液体系	阳离子M	吸附平衡质量浓度/（g·L^-1）	吸附量/ （mg·g^-1）	分离系数 S_Li/M
Li-Na	Li⁺	1.6488	3.5	1.98
Li-Na	Na⁺	2.0538	2.2	1.98
Li-K	Li⁺	1.6719	6.1	1.36
Li-K	K⁺	1.7487	4.7	1.36
Li-Ca	Li⁺	1.7043	3.9	10.78
Li-Ca	Ca²⁺	0.4713	0.1	10.78
Li-Mg	Li⁺	1.7607	2.8	0.04
Li-Mg	Mg²⁺	1.1721	43.0	0.04

阳离子M	吸附平衡质量浓度/（g·L^-1）	吸附量/ （mg·g^-1）	分离系数 S_Li/M
Li⁺	1.736 7	3.0	—
Na⁺	2.022 9	1.5	2.33
K⁺	1.759 2	3.2	0.95
Ca²⁺	0.454 5	0.01	78.51
Mg²⁺	1.203 0	41.3	0.05

实验编号	洗脱液	洗脱液 pH	脱附温度/℃	脱附时间/h	脱附率/ %
1	LiCl	3.33	30	12	10.07
2	LiCl	5.66	30	12	9.17
3	高纯水	3.31	30	12	31.59
4	高纯水	6.56	30	12	28.50
5	高纯水	10.06	30	12	25.71
6	高纯水	3.34	30	24	31.90
7	高纯水	3.27	60	12	40.58
8	高纯水	3.30	60	24	40.51

准一级动力学模型			准二级动力学模型
K₁	Q_e	R²	K₂	Q_e	R²
0.017	4.685	0.927	0.030	6.806	0.976

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Preparation of lithium adsorbent from PAC and its adsorption properties

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