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Synthesis and Characterizations of Aluminum Hydroxide Using NaOH Additional Amounts and Polyalmuniumchloride  

Hwang, Dae Ju (Korea Institute of Limestone and Advanced Material)
Cho, Kye Hong (Korea Institute of Limestone and Advanced Material)
Choi, Moon Kwan (Korea Institute of Limestone and Advanced Material)
Ahn, Ji Whan (Mineral Processing Department, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Han, Choon (Department of Chem. Eng., Kwangwoon Univ.)
Lee, Jong Dae (Department of Chem. Eng., Chungbuk National Univ.)
Publication Information
Korean Chemical Engineering Research / v.48, no.2, 2010 , pp. 205-211 More about this Journal
Abstract
The water-sewage cohesion agent(polyaluminumchloride(PAC)) and NaOH were used to synthesize $Al(OH)_3$. For various additions of NaOH, characteristics of the synthesized $Al(OH)_3$ was analysed by XRD, SEM and PSA. According to XRD analysis, small amount of NaOH(NaOH:PAC=15g:100g) resulted in amorphous form of $Al(OH)_3$. By increasing NaOH(NaOH:PAC=20g:100g), the mixture of gibbsite(37%), bayerite(35%) and boehmite(28%) were produced. By adding more NaOH(NaOH:PAC=25g:100g), binary mixtures of gibbsite(67%) and bayerite(33%) were formed. Finally, high addition of NaOH(NaOH:PAC=30g:100g) gave the high concentration of gibbsite(gibbsite:bayerite=83:17). Also, SEM analysis indicated that the product featured the plate form with 20 and 30g of NaOH addition. Furthermore it was found that the particle size of the product decreased with the addition of NaOH.
Keywords
Aluminum hydroxide; Gibbsite; Bayerite; Boehmite; Polyaluminumchloride(PAC);
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