The major chemical components of DS1 samples are Al2O3 64.31％ ,SiO2 8.92％, A/S 7.11,and TS0.30％.After this sample was treated by the roasting wet pre-desilicification method, the A/S ratio increased from 7.11％ to 26.37％, Al2O3 increased from 63.41％ to 78.53％, and TS decreased from 0.30％ to 0.11％.The roasting temperature was 280 ℃ and the time span was 60 minutes, the ingredient ak was 1.45 and the alkali concentration was 220 g/l.Under the best stripping condition in which the lime additive amount is 4％, the absolute stripping rate of Al2O3 was 95.52％ and the relative rate was 99.59％, the stripping rate of Ga was 91.63％.More than 99％ Al2O3 could be obtained when the dissolved substance was sintered at the temperature of 1100 ℃ for 2 hours.All the other indexes were better than the indexes of aluminium oxide of industrial standard YS/ T274-1998AO-1.The GS1 sample, after roasting wet pre-silicification treatment, A/S increased from 5.31 to 18.88, Al2O3 increased from 61.37％ to 80.09％, SiO2 decreased from 11.55％ to 4.26％ and TS decreased from 1.20％ to 0.16％.These data suggest that, after the treatment, the high-sulfur low-alumina silicified bauxitic ore absolutely can attain the requirement for aluminum-silicon ratio and sulfur content of Bayer process, indicating the application prospect of the high-sulfur low-alumina silicified bauxitic ore.%DS1试样主要化学成分为Al2O3 64.31%,Si2 8.92%,A/S 7.11,TS 0.30%;该试样经焙烧-湿法预脱硅处理后,A/S由7.11提高到26.37,Al2O3由63.41%升高到78.53%,TS从0.30%降低到0.11%;焙砂在温度280℃,时间60 min,配料比ak 1.45,碱浓度为220 g/l,石灰添加量4%的最佳溶出条件下,Al2O3的绝对溶出率为95.52%,相对溶出率99.59%;Ga的溶出率91.63%,溶出物在1100℃下锻烧2 h,可获得Al2O3＞99%,其他各项指标均优于YS/T274-1998AO-1行业标准的氧化铝产品.GS1试样经焙烧-湿法预脱硅处理后,A/S由5.31提高到18.80,Al2O3由61.37%提高到80.09%,SiO2由11.55%降低到4.26%,TS从1.20%降低到0.16%.即高硫低铝硅比矿石经焙烧-湿法预脱硅处理后,完全可达到拜尔法生产氧化铝对铝硅比以及硫含量的要求,从而揭示了高硫低铝硅比矿石的应用前景.
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