Xin-Ru Cui,Xue-Ping Huo,Bing-Jie Zhou et al. Xin-Ru Cui et al.

Among these regions, Inner Mongolia's coal gangue mainly consists of alumina-rich rock gangue, which should be prioritized for alumina extraction and building material production； Shanxi's coal gangue is mainly sandstone gangue with high calorific value, suitable for power generation and building material

Ikechukwu A Nnanwube,Okechukwu D Onukwuli,Monday Omotioma et al. Ikechukwu A Nnanwube et al.

The optimization of alumina extraction from microcline in nitric acid (HNO3) solution is considered in this work. The optimization exercise was performed with the optimization tools of response surface methodology (RSM) and particle swarm optimization (PSO).

Altynsary Bakirov,Ablay Zhunusov,Natalya Oleinikova et al. Altynsary Bakirov et al.

So, when sintering ash and slag waste from Almaty TPP-2 on a three-component charge of the composition CaO:SiO2 = 2; Na2O:(Al2O3+Fe2O3) = 1 at a duration of 60 min and a temperature of 1200 °C, alumina extraction was 83.68 %, under the same conditions, alumina extraction of 87.07 % was obtained during...sintering of ash and slag waste from the Eurasian Energy Corporation, and alumina extraction was 90.2 % during sintering of ash and slag waste obtained after preliminary chemical activation.

Haiyi Hu,Yongqiong Yang,Guiyong Zhou et al. Haiyi Hu et al.

Red mud (RM) is the industrial solid waste produced after alumina extraction from bauxite, and most RM is directly discharged to the landfill yards without any treatment.

Weilun Li,Yilin Wang,Feng Zhu et al. Weilun Li et al.

Opal (SiO2·nH2O, amorphous silica), the by-product of alumina extraction from coal fly ash (CFA), has a strong adsorption capacity and is also an important component of clay minerals in soils.

Andrei Shoppert,Dmitry Valeev,Mamodou Malal Diallo et al. Andrei Shoppert et al.

After ferrous sulfate (FeSO4·7H2O) was added directly at an FeO:Fe2O3 molar ratio of 1:1 at 120 °C for 150 min in solution with the 360 g L-1 Na2O concentration, the alumina extraction ratio reached 96.27% for the coarse bauxite residue size fraction (Sands) and 87.06% for fine BR obtained from red mud

Huidong Liu Huidong Liu

Reuse of the solid residue from coal fly ash alumina extraction (FAAE) by acid leaching is problematic. Conversion of this solid residue into aluminum-rich zeolite (13X) and silicon-rich zeolite (ZSM-5) was investigated in this research.

Guotao Zhou,Yilin Wang,Tiangui Qi et al. Guotao Zhou et al.

The conversion of Al-substituted goethite (Al-goethite) to hematite in gibbsitic bauxite is conducive to alumina extraction during the Bayer process and the enrichment of iron minerals in red mud.

Guotao Zhou,Yilin Wang,Tiangui Qi et al. Guotao Zhou et al.

The hydrothermal hydrogen reduction process for treating high-iron bauxite residue (red mud) was investigated, and the optimum conditions of alumina extraction as well as the enrichment of iron minerals were verified by experiments.

Andrei Shoppert,Irina Loginova,Dmitry Valeev Andrei Shoppert

The methods of alumina extraction from CFA are often based on the pressure alkaline or acid leaching or preliminary roasting with different additives followed by water leaching....The efficiency of the alumina extraction from CFA under atmospheric pressure leaching is low due to the high content of acid-insoluble alumina phase mullite (3Al2O3·2SiO2).