Effect of NaOH Concentration and Solid-to-Liquid Ratio As shown in Figure 4 a, the SiO 2 extraction ratio exhibited an increasing trend with the rise in the NaOH concentration.
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Kinetics and Mechanism of SiO<sub>2</sub> Extraction from Acid-Leached Coal Gangue Residue by Alkaline Hydrothermal Treatment.
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