New Technology for Extracting Silicon and Boron from Boron Mud

Taking boron mud as raw material, the boron mud mixed with sodium carbonate was roasted at 900 ℃ for 2 h, and the SiO2 and B2 O3 in the roasted boron mud were recovered by alkaline leaching method. The reaction in the calcination stage was analyzed by TG-DSC curve. The effects of n (NaOH) / n (SiO2 ), reaction temperature, reaction time and liquid-solid mass ratio on the extraction ratios of SiO2 and B2 O3 in boron mud were studied by single factor experiment. By orthogonal experiment, the order of factors affecting the extraction ratio of SiO2 was determined as n (NaOH) / n (SiO2 ) > liquid-solid mass ratio > reaction time > reaction temperature, and the order of factors affecting the extraction ratio of B2 O3 was reaction time > reaction temperature > n (NaOH) / n (SiO2 ) > liquid-solid mass ratio. The optimum recovery conditions were n (NaOH) / n (SiO2) of 25, reaction temperature of 50 ℃, reaction time of 40 min, and liquid-solid mass ratio of 8. Under these conditions, the extraction ratios of SiO2 and B2 O3 reached 83. 11% and 75. 28%,respectively. © 2022 Northeastern University. All rights reserved.