兰炭焦末的石墨化及其石墨表面包覆研究

发布时间：2018-06-14 09:26

  本文选题：兰炭 + 石墨化　； 参考：《西安建筑科技大学》2015年硕士论文

【摘要】：兰炭是利用陕北榆林地区低磷、低硫、低挥发分煤经低温干馏得到的一种煤化工产品,在其生产过程产生大约15%左右的焦末,目前主要用做冶金还原剂或者低级燃料,经济价值较低。为了开辟兰炭焦末的高副价值利用新途径,本文以兰炭焦粉作为原料,研究其石墨化效果及其石墨基体表面化学镀铜的影响因素。在对兰炭焦末进行工业分析和元素分析的基础上,研究其作为石墨化原料的可能性;借助X射线衍射、SEM电镜扫描和电阻率表征焦末的石墨化效果。石墨化实验结果表明:兰炭焦末直接石墨化,2500℃时其石墨化度可达90%;而在10%铜粉、1%氧化铁和1%二氧化钛催化作用下,1800℃时石墨化度均可达90%以上,石墨化温度直接降低700℃。另外,热处理温度越高,石墨化产物的2H空间结构越完整,产物的纯度也越高,尤其是在Cu粉催化作用下,产物更趋于完整的三维空间网状结构。但是,焦末石墨化度要达到90%以上,铜粉添加量最少需8%。综合考虑,选择质优价廉的氧化铁作为兰炭焦末石墨化过程的催化剂。石墨表面光滑,具有疏水性和惰性,很难直接进行化学镀铜,采用亲水化、表面粗化、敏化、活化以及还原五步法对其进行表面预处理,主要研究了主盐浓度、还原剂浓度、络合剂配比、施镀温度、施镀时间和石墨装载量等因素对石墨表面化学镀铜效果的影响。结果表明,当CuSO4浓度为20g/L,甲醛量为15mL/L,络合剂为双络合体系(15g/L的酒石酸钾钠和25g/L的EDTA二钠盐),施镀温度为60℃,施镀时间为20min,石墨装载量为6g/L时,石墨表面形成较完整的铜镀层,镀覆效果较好。研究结果为兰炭焦末的石墨化以及石墨表面化学镀铜提供了理论与技术支持,开辟了兰炭焦末应用的新途径,同时也促进了榆林地区兰炭产业的健康发展。
[Abstract]:Blue charcoal is a kind of coal chemical product obtained from low phosphorus, low sulfur and low volatile coal through low temperature dry distillation in Yulin area, northern Shaanxi Province. It produces about 15% of coke powder in its production process. At present, it is mainly used as metallurgical reductant or low grade fuel. Economic value is low. In order to open up a new way for the utilization of high secondary value of blue carbon coke powder, the graphitization effect of blue coke powder and the influencing factors of electroless copper plating on graphite substrate were studied in this paper. On the basis of industrial and elemental analysis of char powder, the possibility of its use as graphitization raw material was studied, and the graphitization effect of char powder was characterized by SEM scanning electron microscope and resistivity. The results of graphitization experiment show that the graphitization degree of blue carbon coke can reach 90 when it is graphitized directly at 2500 鈩，

本文编号：2016898