Zhou Shichao,Chen Zhengjie,Ma Wenhui,Li Shaoyuan,Li Chen,Wu Jijun,Yang Xi
The effect of K 2 CO 3 as an additive agent in the carbothermic reduction process of silicon production is investigated in this study. Using a thermogravimetric analyzer (TGA) in argon atmosphere, different proportions of petroleum coke (PC) and pomelo peel (PP) are used as the carbonaceous reducing agent. Findings show that the additive displays catalytic activities for reductant composition of PC and PP in solid state under high temperature. The maximum mass loss rate of samples with additive is found to increase by 13.7% in the same conditions, compared to samples without the additive. In addition, a homogenous model (HM) is studied as a kinetic model using the Coats-Redfern method to observe and determine the kinetic parameters of all samples. High correlation coefficient values for the pyrolysis stages (R 2 > 0.99) and the carbothermic reduction stage of silicon dioxide (R 2 > 0.98) are obtained for all samples, illustrating that the kinetic model is applicable to this reaction process. According to findings in this study, the additive K 2 CO 3 is determined to positively impact reaction activity, speeding up the rate of pyrolytic reaction and the carbothermic reduction of silica.
Shichao Zhou,Zhengjie Chen,Wenhui Ma,Shaoyuan Li,Kuixian Wei,Jijun Wu,Xi Yang
High energy consumption and high pollution arising from the production of a compound reductant with high-coke and high-coal has drawn universal attention and urgently requires a solution. In this study, activated carbon (AC) as a carbonaceous reductant produced via combined microwave heating and additive inclusion (K 2 CO 3 and Na 2 CO 3 ) was investigated during carbothermic reduction of silicon . The effect of microwave-assisted treatment on the kinetic and thermal behavior of AC mixed with alkali carbonate was evaluated by thermogravimetric analysis . By using microscopy techniques such as Raman spectroscopy , Fourier-transform infrared spectroscopy, and field-emission scanning electron microscopy (FESEM), the influence of specific factors on the chemical properties of the AC were analyzed. The results showed that the properties of the silicon produced via carbothermic reduction changed after microwave-assisted treatment, which was attributable to changes in structure of the aromatic ring and carbon chain in the AC. In the presence of different alkali carbonates, AC subjected to microwave-assisted treatment exhibited varied in performance because of the different degrees of microwave absorption of the different alkali carbonates. For the additive K 2 CO 3 , weight loss improved by 54.35%, and activated energy was reduced by 31.32% during reduction reaction under microwave-assisted treatment. Similarly, the weight loss increased by 42.01%, and the activated energy decreased by 14.30% for the additive Na 2 CO 3 . These data indicated that the largest improvement was achieved under microwave-assisted treatment, which contributed substantially to energy-saving. Carbonaceous reductants are important raw materials for silicon production, which currently present a major technical problem. These research results may provide new insights into the use of AC loaded with alkali metal compounds as a carbon reducing agent in production systems.
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