Process optimization of reaction of acid leaching residue of asbestos tailing and sodium hydroxide aqueous solution |
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Authors: | GaoXiang Du ShuiLin Zheng Hao Ding |
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Affiliation: | (1) School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China;(2) School of Chemical and Environment Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China;(3) Hebei Qinghe Refractory Group Co. Ltd., Xingtai, 054804, China |
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Abstract: | Silica is the major component of the acid leaching residue of asbestos tailing. The waterglass solution can be prepared by
the reaction of the residue with sodium hydroxide aqueous solution. Compared to the high temperature reaction method, this
process is environmental friendly and low cost. In this paper, the reaction process of the residue and the sodium hydroxide
aqueous solution is optimized. The optimum reaction process parameters are as follows: the usage of sodium hydroxide is 26.4
g/100 g acid leaching residue, the reaction temperature is 90°, the reaction time is 1 h, and the ratio of the liquid/ solid
is 2.0. The significance sequence of the process parameters to the alkali leaching reaction effect is the usage of sodium
hydroxide > the ratio of the liquid/solid > the reaction time > the reaction temperature. The significance sequence to the
leaching ratio of SiO2 is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. The significance
sequence to the modulus of the sodium silicate is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction
time > the reaction temperature. Under the optimum conditions, the leaching ratio of the SiO2 is 77.5%, and the modulus of the sodium silicate is 3.15. The XRD analysis result indicates that the major components of
the alkali leaching residue are serpentine, talc, quartz and some albite.
Supported by the National Natural Science Foundation of China (Grant No. 50674080) |
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Keywords: | asbestos tailing acid leaching residue sodium hydroxide process optimization |
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