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Bauxite is the main raw material to produce alumina, whose mineralogical characteristic and processing technology affect its general utilization directly. Diasporic bauxite is the major kind in China.... Table 1 Chemical compositions of low-grade diasporic bauxite (mass fraction, %) It can be seen from mineral compositions by XRD analysis given in Table 2 that, the aluminous minerals in the ore include......
is higher than that of raw ore. Keyword: diasporic bauxite; chemical processing; desiliconization; Received: 1999-12-18 我国铝土矿资源丰富, 储量达24亿吨, 但从... (G19990 64 90 1); Desilication from diasporic bauxite by roasting-alkali leaching process (Ⅰ) Abstract: Using the ore from Sanxi province, the roasting process......
, respectively. The results are as good as those obtained with pressurization. [ Keyword: diasporic bauxite; chemical concentration; desilication; Received... from diasporic bauxite by roasting-alkali leaching process (Ⅲ) Abstract: The technology of desilication digestion by alkali leaching at normal atmospheric pressure......
pH was reduced from 10.47 to 8.15 with a gypsum addition 1.2%, ratio of liquid to solid 2 mL/g, at 30 °C, 4 h. Figure 11 Alkalinity stabilization mechanisms of gypsum in bauxite residue 2) Chemical...: 10.1007/s11771-017-3568-8. [4] PAN Xiao-lin, YU Hai-yan, TU Gan-feng. Reduction of alkalinity in bauxite residue during Bayer digestion in high-ferrite diasporic bauxite [J]. Hydrometallurgy, 2015, 151: 98–106. DOI......
bauxite residue used in this study was collected from Guangxi Pingguo Aluminum Refinery, China. The sample was air dried and sieved (830 μm) prior to use. The main chemical composition of bauxite residue is presented in Table 1. Table 1 Chemical composition of bauxite residue (mg·kg–1) Raw phosphogypsum was collected from a phosphogypsum yard in Guizhou, China. The sample was uniformly mixed, dried......
to 57.50% in 2018 with an annual production of 69 million tons of alumina. 2.2 Alkaline sources and transformations The physical and chemical properties of bauxite residues vary according to the composition of bauxite and the alumina extraction process [50, 51]. However, the chemical composition of bauxite residue mainly includes Na2O, Al2O3, Fe2O3, SiO2, TiO2 and CaO. Approximately 95% of the global......
revegetation of bauxite residues are examined. The first phase is the natural physical, chemical and microbial ripening of the profile. This involves allowing the profile to drain, dry, shrink and crack... minerals are dissolved in concentrated sodium hydroxide at high temperatures and pressures. The insoluble solids (bauxite processing residues) are deposited in storage impoundments surrounding......