Study on Influencing Factors of determination of effective aluminum content in bauxite
Received:January 21, 2021  Revised:February 04, 2021
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DOI:10.3969/j.issn.2095-1035.2021.04.007
KeyWord:bauxite; available aluminum; determination
                 
AuthorInstitution
songfei 青岛检验检疫技术发展中心
SONG Fei 青岛检验检疫技术发展中心
SUN Bo 青岛检验检疫技术发展中心
FENG Lili 青岛检验检疫技术发展中心
LIU Meidong 青岛检验检疫技术发展中心
ZHANG Qingjian 青岛检验检疫技术发展中心
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Abstract:
      The main factors affecting the determination of effective aluminum content in bauxite were studied. The effect of sample size and uniformity on the dissolution of available aluminum and the effect of sample composition on the content of available aluminum were discussed. The content of effective aluminum in bauxite was determined by inductively coupled plasma atomic emission spectrometry(ICP-AES). The content of total alumina and other impurities in bauxite was determined by X-ray fluorescence spectrometry (XRF). The phase composition of samples was analyzed by X-ray diffraction spectrometry (XRD). The structure and proportion of main components were determined, so as to dissolve and measure the effective aluminum. The sample uniformity is good and the effective aluminum dissolution rate is high because of the sample size less than 0.106mm. And the precision of the testing is high. The proportion of gibbsite is high and monohydrate is low for the saomples. So It is easier to react with sodium hydroxide at low temperature, resulting in high dissolution rate. The experimental accuracy is from 99.10 to 100.80% and the experimental standard deviation is 0.14% and the relative standard deviation is 0.003%. It plays an important guiding role and provides technical support for the monitoring of effective aluminum in bauxite.
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