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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front Chem Eng Chin    2009, Vol. 3 Issue (1) : 88-92    https://doi.org/10.1007/s11705-009-0133-5
RESEARCH ARTICLE
Additives effects on crystallization and morphology in a novel caustic aluminate solution decomposition process
Ying ZHANG1,2, Shili ZHENG1(), Yifei ZHANG1, Hongbin XU1, Yi ZHANG1
1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

A novel process of caustic aluminate solution decomposition by alcohol medium was developed by the Institute of Process Engineering, Chinese Academy of Sciences in order to solve the problem of low decomposition ratio in the traditional Bayer seeded hydrolysis process. In this research, effects of additives on the crystallization ratio, secondary particle size and morphology of aluminum hydroxide in the new process were studied to obtain high-quality products. On the basis of primary selection of additives, an orthogonal design L9(34) was used as a chemometric method to investigate the effects of additives. The studied parameters include the reaction style, quantity of additives, caustic soda concentration, as well as the combination manner. The crystallization ratios of sodium aluminate solution and crystal size of aluminum hydroxide, determined by ICP-OES, SEM and MLPSA (Malvern Laser Particle Size Analyzer), were used to evaluate the effects of the additives. The results showed that different combination manners could promote agglomeration or dispersion. An additive composed by Tween 80 and PEG 200 could promote agglomeration, while a spot of PEG species had a relatively strong dispersion effect. However, the additives had little effects on the crystallization ratios. According to the Raman spectra result, the added alcohol medium might serve as a kind of solvent.

Keywords additive      crystallization      morphology      caustic aluminate solution      aluminium hydroxide     
Corresponding Author(s): ZHENG Shili,Email:slzheng@home.ipe.ac.cn   
Issue Date: 05 March 2009
 Cite this article:   
Ying ZHANG,Shili ZHENG,Yifei ZHANG, et al. Additives effects on crystallization and morphology in a novel caustic aluminate solution decomposition process[J]. Front Chem Eng Chin, 2009, 3(1): 88-92.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0133-5
https://academic.hep.com.cn/fcse/EN/Y2009/V3/I1/88
additivesPEG200PEG6000SDBSTween 80SDSno additivesoleic acidsodium hexametaphosphate
mean/μm33.9944.4437.1443.9345.9253.8661.5473.35
Tab.1  Effects of different additives on particle size of aluminum hydroxide
levelsreaction styleAquantity of additives/%Bcaustic soda concentrations/(g·L-1)Ccombination mannersD
1adding prepared solution later0.550Tween 80+ SDBS
2adding alcohol medium later1.0100PEG200+ PEG6000
3adding the liquid simultaneously2.0150Tween 80+ PEG200
Tab.2  Factors and levels for orthogonal design (A–D are respective codes for each factor)
ABCDprecipitation ratio/%mean diameter/μm
trial number
1111196.7124.47
2122290.7829.90
3133375.9461.27
4212371.7656.47
5223154.7323.29
6231287.1270.87
7313260.8726.43
8321375.4279.99
9332174.2445.60
precipitation ratio/%
K1/387.8176.4586.4275.23
K2/371.2073.6478.9379.59
K3/370.1879.1063.8574.37
R17.635.467.495.22
mean diameter/μm
K1/338.5535.7958.4431.12
K2/350.2144.3943.9942.40
K3/350.6759.2537.0065.91
R12.1323.4621.4534.79
Tab.3  Results of orthogonal test L9 (3) and range analysis
precipitation ratio
source of variancesum of squaredegree of freedommean squareF-valueP-value
reaction style587.772293.8813.160.07
quantity of additives44.67222.341.000.50
caustic soda concentrations792.912396.4617.750.05
combination manners46.98223.491.050.49
Total1472.338184.04
mean diameter
source of variancesum of squaredegree of freedommean squareF-valueP-value
reaction style283.302141.651.000.50
quantity of additives844.852422.432.980.25
caustic soda concentrations717.772358.882.530.28
combination manners1890.302945.156.670.13
Total3736.228
Tab.4  ANOVA of precipitation ratio and mean diameter
Fig.1  Effects of different additives on the morphology of particles.
(a) Trial number 3; (b) trial number 7
Fig.2  Raman spectra of the liquors
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