钠盐活化赤泥-煤矸石酸浸液制备聚合氯化铝

doi:10.19964/j.issn.1006-4990.2022-0386

Abstract

Abstract:

Poly-aluminium chloride（PAC） was prepared from the acid leaching liquor of sodium activated red mud-coal gangue activated by sodium salt through evaporation crystallization and alkalization polymerization.Firstly，the effect of impurity ion concentrations in acid leaching liquor on the quality of PAC was studied，and the impurity ion was selectively removed through evaporation crystallization.Then the effects of polymerization conditions including temperature，time and adding rate of alkalizing agent on the basicity and Al₂O₃ content of PAC were evaluated.The results showed that the basicity and Al₂O₃ content of the prepared PAC were qualified according to national standard GB/T 22627—2022 when Na⁺ concentration was lower than 0.5 mol/L in the acid leaching liquor.Based on the solubility difference of NaCl，AlCl₃，CaCl₂ and FeCl₃，sodium could be selectively removed by evaporation crystallization，and the concentration of Na⁺ in the acid leaching solution could be controlled below 0.5 mol/L.The PAC product meeting the quality requirements of GB/T 22627—2022 could be prepared by evaporating the crystallization mother liquor and then passing through the appropriate polymerization conditions（polymerization temperature was 80 °C，polymerization time was 120 min，and alkalizing agent addition rate was 8.0 mL/min）.The flocculation performance of PAC obtained from the acid leaching liquor for domestic sewage treatment was better than that of commercial flocculant，and the removal efficiencies of COD，turbidity and UV₂₅₄ were 85.62%，76.36% and 70.31%，respectively.

Key words: red mud, coal gangue, evaporation crystallization, PAC, flocculation performance

CLC Number:

TQ133.1

WANG Lijuan, YAN Kezhou, GUO Zhiqiang, ZHAO Zhonghe, GUO Yanxia, CHENG Fangqin. Preparation of poly-aluminum chloride from acid leaching liquor of red mud-coal gangue activated by sodium salt[J]. Inorganic Chemicals Industry, 2023, 55(4): 76-83.

Figures/Tables 12

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样品	w（Al₂O₃）/%	w（SiO₂）/%	w（Fe₂O₃）/%	w（Na₂O）/%	w（CaO）/%	w（TiO₂）/%	w（MgO）/%	w（K₂O）/%	LOI	n（Al）/n（Si）
赤泥	20.72	16.22	24.25	9.79	10.93	3.91	0.44	0.53	11.83	1.50
煤矸石	21.06	41.36	2.52	0.43	0.95	0.77	0.50	2.00	23.42	0.61

盐类	溶解度/g
盐类	10 ℃	30 ℃	40 ℃	50 ℃	60 ℃	70 ℃	80 ℃	90 ℃	100 ℃
AlCl₃	44.9	46.6	47.3	47.8	48.1	48.4	48.6	48.8	49.0
NaCl	35.8	36.3	36.6	37.0	37.3	37.8	38.4	39.0	39.8
CaCl₂	64.7	100.1	128.3	132.5	137.2	142.3	147.5	154.0	159.3
FeCl₃	81.9	106.8	282.4	315.1	410.4	487.3	525.8	531.3	535.7

指标		颜色	w（Al₂O₃）/%	盐基度/%
GB/T 22627—2022	优等品	白色	≥30	40~90
	一等品	浅黄色	≥28	40~90
	二等品	浅黄色	≥27	40~90
模拟酸浸液制备PAC		浅黄色	28.2	69.5
实际酸浸液制备PAC		浅黄色	27.8	67.3

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Preparation of poly-aluminum chloride from acid leaching liquor of red mud-coal gangue activated by sodium salt

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