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基于CO2矿化利用(CMU)的学术思想,提出了钾长石与氯化钙或硫酸钙焙烧提钾/提钾渣矿化固定CO2的技术路线。但是这两种路线得到提钾渣中硅酸钙(主要物相是硅灰石Ca Si O3和假硅灰石Ca3Si3O9)矿化CO2活性有很大的差异。本文考察了焙烧温度对硅酸钙矿化CO2的影响,结果表明,未焙烧硅酸钙矿化CO2转化率达到95%,随着焙烧温度的升高,硅酸钙的转化率逐渐降低,由900℃的82%逐渐降至1300℃的48%。XRD分析表明,焙烧处理使硅灰石逐渐转化成为更易于与CO2反应的假硅灰石;SEM观察发现,焙烧导致非晶态的硅酸钙颗粒晶化与烧结,比表面积显著地降低。上述两种相反的影响中,比表面积降低的不利因素占据了主导,从而降低了硅酸钙矿化CO2反应的活性。
Based on the idea of CO2 mineralization (CMU), a technological route of mineralization and fixation of CO2 with potassium feldspar and calcium chloride or calcium sulfate is proposed. However, these two routes are greatly different from the CO2 activity of mineralization of calcium silicate (the main phase is CaSi03 and fossilite Ca3Si3O9). In this paper, the effect of calcination temperature on the mineralization of CO2 by calcium silicate was investigated. The results showed that the conversion of calcium silicate reached 95%. With the increase of calcination temperature, the conversion rate of calcium silicate gradually decreased from 82% of 900 ° C gradually decreased to 48% of 1300 ° C. XRD analysis showed that the calcination treatment transformed wollastonite into faux-wollastonite which was easier to react with CO2. SEM observation showed that calcination resulted in the crystallization and sintering of amorphous calcium silicate particles, and the specific surface area decreased significantly. Among the above two opposite effects, the unfavorable factors of decreasing the specific surface area dominated, thereby reducing the activity of calcium silicate mineralized CO2 reaction.