铝灰资源化制备拟薄水铝石的研究

doi:10.19964/j.issn.1006-4990.2023-0072

Abstract

Abstract:

The pseudo-boehmite can be used as a binder，catalyst carrier and raw material in the petroleum，construction and environmental protection industries due to its strong adhesion and thixotropic gel characteristics under acidic conditions.Herein，hazardous waste aluminum dross was used as raw material，and pseudo-boehmite was prepared by hydrothermal reaction through high-temperature roasting and alkali solution leaching.The interaction effects of different heating temperatures，the mass fraction of NaHCO₃ solution and reaction time on hydrothermal reaction were studied by response surface methodology.The phase composition，chemical composition，microstructure，and peptizing properties of the prepared pseudo-boehmite were analyzed.The results showed that roasting could effectively remove AlN and fixed fluoride contained in aluminum dross，the relative extraction rate of aluminum was 36.59% after alkali solution leaching.The optimal hydrothermal reaction conditions for pseudo-boehmite preparation with NaAlO₂ solution were obtained by experiments as follows：a heating temperature of 98 ℃，adding the NaHCO₃ with a mass fraction of 11% and a hydrothermal reaction of 2 h.After washing twice，the peptizing index of the product prepared by hydrothermal reaction could reach 95.22% with a high purity.The specific surface area and pore volume of pseudo-boehmite were 219.17 m²/g and 0.30 cm³/g，respectively.Compared with the pseudo-boehmite prepared by other inorganic aluminum methods，the specific surface area of this method was higher，and the cost of this method was lower than that of the pseudo-boehmite prepared by the alcohol aluminum method.

Key words: pseudo-boehmite, aluminum dross, alkali solution leaching, hydrothermal reaction, response surface methodology

CLC Number:

P578.4+96

TENG Jiayang, FENG Qingge, ZHANG Xuan, QIN Fanghong, FENG Jinghang, HU Jiawen, CHEN Chaohong. Study on preparation of pseudo-boehmite from aluminum dross resource treatment[J]. Inorganic Chemicals Industry, 2023, 55(11): 130-138.

Figures/Tables 15

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样品	质量分数/%
样品	SiO₂	Al₂O₃	Na₂O	Fe₂O₃	CaO	MgO	F
原铝灰	2.65	74.32	4.11	2.27	4.18	14.85	0.061
焙烧和碱浸后的铝灰	1.37	47.13	3.34	1.97	6.24	14.21	0.057

水平	因素
水平	A（加热温度）/ ℃	B（NaHCO₃ 质量分数）/%	C（反应时间）/ h
-1	85	5	1.5
0	95	10	2.0
1	105	15	2.5

方差来源	平方和	自由度	均方	F值	P值	显著性
模型	85.77	9	9.53	19.42	0.000 4	**
A	3.52	1	3.52	7.18	0.031 5	*
B	14.39	1	14.39	29.33	0.001 0	**
C	1.62	1	1.62	3.30	0.112 0	不显著
AB	3.69	1	3.69	7.51	0.028 9	*
AC	1.78	1	1.78	3.63	0.098 3	不显著
BC	1.53	1	1.53	3.11	0.121 2	不显著
A²	32.75	1	32.75	66.76	<0.000 1	**
B²	11.52	1	11.52	23.48	0.001 9	**
C²	9.37	1	9.37	19.09	0.003 3	**
残差	3.43	7	0.490 6
失拟项	1.62	3	0.539 0	1.19	0.420 5	不显著
纯误差	1.82	4	0.454 3
总离差	89.21	16
R²=0.961 5

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Study on preparation of pseudo-boehmite from aluminum dross resource treatment

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序号	A	B	C	Y（胶溶指数）/%
1	1	0	-1	71.51
2	0	-1	-1	75.50
3	0	0	0	78.18
4	-1	0	1	73.25
5	1	-1	0	72.55
6	-1	0	-1	74.45
7	0	0	0	76.62
8	1	1	0	72.17
9	0	1	1	74.10
10	1	0	1	72.98
11	-1	1	0	71.30
12	0	0	0	77.82
13	0	0	0	77.28
14	0	1	-1	71.20
15	0	0	0	76.74
16	0	-1	1	75.93
17	-1	-1	0	75.52