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Study on Iron Removal and Whitening of Sandy Kaolin from Guangdong

Zhang Lingyan Zhang Danping Wang Hao Lu Kang Tian Zhao(College of Resourceful and Environmental Engineering,Wuhan University of Technology,Wuhan,Hubei 430070)  
The sandy kaolin which was from Guangdong province was determined as the object of study.The overflow product of Φ50 mm hydro-cyclone was taken as raw materials,and iron removal and bleaching experiments of the samples were studied.The technological process was magnetic separation first and then reductive bleaching.The slon-100 high gradient magnetic separator was taken and the magnetic separation conditions were as follows: the magnetic medium was fine bristles,the magnetic field strength was 1.4 T,the slurry flow rate was 1.0 cm/s,and the pulsation intensity was 200 r/min.The effects of the pH value,the acid type,the amount and the frequency of agent dosing of sodium hydrosulfite,the amount of oxalic acid,reaction time,temperature and the number of bleaching to reductive bleaching were researched.The best process condition of bleaching was as follows: the slurry concentration was 20%,the pH value was 2.2 by sulfuric acid,sodium hydrosulfite dosage was 3% and added into with 3 times,the amount of oxalic acid was 2%,and reaction time was 30 min.After magnetic separation and reduction bleaching of the samples,the whiteness increased from 56.04% to 66.61 % and the calcinations whiteness at 1200℃ was up to 86.10%.The bleached kaolin can meet the needs of some fields such as rubber fillings and plastic fillings.
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