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Citation: HE Zi-Han, YANG Li-Xin, WANG Wen-Bo. Effect of Temperature on the Stability of Al_b Polyaluminum Ion and the Modality of Sulfate Precipitates[J]. Chinese Journal of Applied Chemistry, ;2006, 23(11): 1209-1213. shu

Effect of Temperature on the Stability of Al_b Polyaluminum Ion and the Modality of Sulfate Precipitates

1.
College of Chemistry, Xiangtan University, Xiangtan 411105

Corresponding author: YANG Li-Xin,
Received Date: 25 November 2005
Available Online: 15 March 2006
Fund Project: 湖南省教育厅资助项目(04C640) (04C640)

By employing Al-Ferron timed complexation colorimetry,Al_b polymer from polyaluminum chloride (PAC) prepared by the partial alkalization of an AlCl₃ solution varied with solution temperature, slaking time and basicity was investigated in detail.The results show that increasing slaking temperature or time could lead to the decrease of Al_b content.Especially,when the temperature was higher than 80℃,it was disadvantageous to stabilize Al_b polymer,which quickly decreased after slaking at 100℃ for 3 h.Because of the influences of the dual factors,the distribution of Al species in solution was subjected to the alkalization equilibrium of polyaluminum ions and unstable Al_b polymer,the clear liquid containing as high as 83.19% Al_b could be obtained through slaking treatment for 3 h at 80℃ from the PAC sample of B=80% prepared and aged at room temperature.For the PAC samples prepared by means of dropping alkali slowly at room temperature,the change extent of mass fraction of their Al_b polymer could maximally reach 67.15% under different aging or slaking conditions.It was indicated by XRD and SEM that the crystallinity of the samples at room temperature were relatively high among the precipitates formed by the reaction of polyaluminum ions and sulfate radical,and that the tetrahedron crystal of Al₁₃ could be prepared.After samples were processed at high temperature,their sulfate precipitates got gelatinous modality.
- Al_b polyaluminum ion,
- stability,
- effect of temperature,
- sulfate precipitate,
- Al-Ferron complexation colorimetry
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Effect of Temperature on the Stability of Alb Polyaluminum Ion and the Modality of Sulfate Precipitates

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Effect of Temperature on the Stability of Al_b Polyaluminum Ion and the Modality of Sulfate Precipitates