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Liu C.,Chinese Academy of Geological Sciences | Fang L.,Chinese Academy of Geological Sciences | Zhang K.,China National Engineering Research Centerer for Utilization of Industrial Minerals | Guo Z.,Key laboratory for poly metallic ores utilization of Chinese Ministry of land and resources
International Journal of Earth Sciences and Engineering | Year: 2014

China was rich in bauxite resources, including a huge reserves of super poor bauxite located in Guangxi region. The Al-Si ratio was generally about 2, processing were very difficult. First, the authors took a physical beneficiation test to explore ways, through a series of positive flotation and reverse flotation condition test, they found the reverse flotation were better to improve alumina-silica ratio, aluminum-silicon ratio of 2# ore samples can be increase from 2 to 5.6. They also found ore Al-Si ratio had a great influence on the final concentrate Al-Si ratio, undressed ore Al-Si ratio had better achieving 2 by ore matching ways. And bauxite sintering dissolution tests showed that Al2O3 dissolution rate was high after the bauxite ingredients sintering, 1# sample and 2# sample dissolution rates were much higher than the flotation recoveries, and because aluminum silicon ratio of 2# sample was a little higher, the dissolution rate can reach 71.87%. The test results showed that positive flotation was not fit for poverty bauxite, reverse flotation process can obtain a certain effect, and the sintering aluminum process can fully recycle the useful minerals ©CAFET-INNOVA TECHNICAL SOCIETY Source


Liua C.,Chinese Academy of Geological Sciences | Liua C.,China National Engineering Research Centerer for Utilization of Industrial Minerals | Liua C.,Key laboratory for poly metallic ores utilization of Chinese Ministry of land and resources | Fang L.,Chinese Academy of Geological Sciences | And 8 more authors.
International Journal of Earth Sciences and Engineering | Year: 2014

Henan province has large reserves of low grade bauxite resource. Couples of tests for the bauxite desliming were carried on to gain the best conditions and controlling parameter. The industrial water in Henan province was moderate hard water which affected the pulp dispersion a lot during bauxite desliming process. With sodium hexametaphosphate as dispersant, the bauxite desliming results of sample I in industrial and deionized water showed that calcium and magnesium ions affected the desliming effect seriously. Sodium hexametaphosphate not only can eliminate the influence of calcium and magnesium ions, but also acted as dispersant.Sodium silicate had similar disperse effects to sodium hexametaphosphate, and their dosage was similar too. When the desliming particle size was 10 µm and pulp concentration was 8%, as to bauxite sample I, slimes with a yield of about 10% and can be removed with sodium hexametaphosphate and sodium silicate as dispersant and water softener; about 90% rough concentrate with an Al-Si ratio of 5.60 can be obtained at the same time. In continuous operation, the hydraulic desliming equipment worked normally and reliably. When treating low grade bauxite with an Al-Si ratio of 4.71, bauxiteconcentrate with an Al-Si ratio of 6.78 and Al2O3 recovery of 85.14% can be obtained by the equipment. © 2014 CAFET-INNOVA TECHNICAL SOCIETY. Source

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