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粉煤加适量消石灰混合成型,通CO_2生成碳化煤球,为合成氨原料。测定其比表面为36.6米~2/克,平均孔径为212埃.此值远大于CO_2和H_2O分子直径,认为碳化反应在整个球体进行,由于石灰岩迁移和液相扩散生成CaCO_3网状骨架,使碳化煤球有较高的耐压强度。碳化煤球是将粉煤和一定量的消石灰Ca(OH)_2,加适量水混合,经压球成型,通CO_2气体碳化Ca(OH)_2+CO_2→CaCO_3+H_2O,并加热赶走外加的水和反应生成水而制得。它具有较高的耐压强度和反应活性,是粉煤成型生产合成氨很有前途的原料,现国内小氨肥厂广泛使用。测定碳化煤球比表面,对揭示其内部精细结构,探讨反应机理,以改进工艺条件有重大意义。
Pulverized coal plus appropriate amount of hydrated lime mixed shape, through the formation of carbonized coal briquettes CO_2, ammonia raw materials. The specific surface was measured at 36.6 m 2 / g with an average pore diameter of 212 A. This value was much larger than the molecular diameters of CO 2 and H 2 O, and the carbonation reaction was considered to take place throughout the sphere due to limestone migration and liquid phase diffusion to form CaCO 3 network framework Carbonized briquettes have higher compressive strength. Carbonized briquettes are obtained by mixing pulverized coal with a certain amount of hydrated lime Ca (OH) 2, adding appropriate amount of water, and forming carbonized Ca (OH) 2 + CO 2 → CaCO 3 + H 2 O by carbon dioxide gas through pressure ball molding, And the reaction generated water and prepared. It has high compressive strength and reactivity, is a very promising raw material for the production of synthetic ammonia in pulverized coal, and is widely used in small ammonia plants in China. Determining the specific surface of the carbonized briquettes is of great significance to reveal the fine structure inside and to explore the reaction mechanism to improve the process conditions.