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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 1    February 2002

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Technology and mechanism of desilication from
roasted diasporic bauxite in atmos phere
LI Guang-hui(李光辉),JIANG Tao(姜  涛),QIU Guan-zhou(邱冠周),
FAN Xiao-hui(范晓慧),JIANG Hao(蒋  昊)

Department of Mineral Engineering,Central South University,
Changsha 410083, China

Abstract:The leaching desilication technology of roasted diasporic bauxite in atmosphere by caustic soda solution was investigated. The optimum parameters were: the grin ding fineness of the roasted bauxite -0.076mm and 80%~85%,leaching time 2h, Na2Ok 100~150g/L, L/S 4~5,leaching temperature 90~95℃.The desilication rate 55.20% and concentrate A/S (mass ratio of Al2O3 to SiO2) 9.90, as good as those obtained at pressure, were obtained respectively. Investigation of twostage leaching shows that it can both improve desilication rate of roasted ore and reduce leaching time. When time of the first stage and the second stag e is 30min and 30min respectively, desilication rate can reach 59.65%. X-ray diffraction analysis of the concentrate has proved that desilication procedure is accompanied with the formation of sodium aluminosilicate hydrate.X-ray spectra also show that silica removed during leaching is amorphous silica. SiO2 occurring as quartz in raw ore or mullite formed during roasting can not dissolve in alkali solution.

 

Key words: diasporic bauxite;roast;chemical processing;desilication

ISSN 1672-7029
CN 43-1423/U

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