碱渣作为添加剂提高焦炭反应性的研究

IMPROVING COKE REACTIVITY BY ADDING SODA RESIDUE

以碱渣（质量分数分别为1%和2%）为添加剂配入吕家坨焦煤中炼焦,考察不同碳溶反应温度（850℃～1 200℃）下焦炭的热性质。结果表明,添加碱渣可以提高焦炭的反应性,降低碳溶反应的起始温度;焦炭反应后比表面积最大值的失碳量随着碱渣添加量的增加逐渐增大,说明碱渣的添加可以增加焦炭碳溶反应的活性点;电镜分析结果表明,碱渣的添加对焦炭反应前的微观结构影响不显著,但碱渣能够促进焦炭表面的溶损,抑制焦炭内部溶损,从而减缓焦炭的劣化。

Soda residue was added to Ltijiatuo coking coal with different blending ratios and cokes were then prepared from these blended coal samples. The thermal properties of these cokes at different reaction temperatures （850 ℃-1 200 ℃） were investigated. The results show that the addition of soda residue enhances coke reactivity and lowers the starting temperature of solution loss reaction of coke. The carbon loss amount at the maximum of surface area of coke af- ter reaction increases with the increase of adding amount of soda residue, which shows that addi- tion of soda residue increases the active points of solution loss reaction of coke; the SEM study shows that addition of soda residue has little effect on the micro-morphology of coke before reac- tion. However, soda residue can promote the solution loss of coke surface, control the solution loss of internal coke, which would slow down the degradation of cokes.