褐煤半焦粉制备型焦的研究..docVIP

褐煤半焦粉制备型焦的研究 艾沙江1,2,王永刚1,林雄超1,张海永1,徐荣声1, 杨远平1,申恬1 (1，中国矿业大学（北京） 化学与环境工程学院，北京 100083 2，潞安新疆煤化工集团新合实业有限责任公司，新疆哈密三道岭 839003）摘要：粘结剂型焦冷热强度的规律温度抗压强度关键词：型焦；粘结剂；温度；抗压强度 molding metallurgical coke formed by lignite char powder （School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing)，Beijing 100083，China） Abstract: The lignite char powder can be pressed to formed coke for its effective utilization. Lignite char powder from Xinjiang Hami Sandaoling was formed with composite binder to prepare molding metellurgical coke. The components ratio of blinder for formed coke was optimized by measuring the cold and thermal strength of the products. The effects of temperature and pressure on the compressive strength were investigated and the surface morphologies of the formed coke under different carbonization temperatures were studied by SEM. The results indicated that the optimum composition of the binder was 3.65% starch, 2.81% pitch, 0.33% organic calcium, 0.49% Fe2O3, 34% water. The compressive strength of formed coke increased with increasing pressure during briquetting. With the increase of temperature, the compressive strength of formed coke reduced significantly at 300~500°C, while then increased at 500~900°C The strength at low temperature mainly came from physical interactions such as Van der Waals forces and electrostatic force, with the increase of temperature, the bridge bonding formed by pyrolysis of starch and pitch was the main reason. As temperature was increased over 500°C, the compressive strength was enhanced by the bonding reaction from organic calcium and Fe2O3 with char particles. Keywords: formed coke; binder; carbonization temperature; compressive strength 0 引 言 半焦又名为兰炭，是焦炭低成本替代品作为导电供热原料广泛应用在化工、铁合金冶炼、高炉炼铁中在半焦生产和应用过程中会产生大量的焦粉，降低了半焦的有效利用率[1。目前，我国大部分产焦及用焦企业因未能找到焦粉的有效利用途径，只能暂时堆积在厂矿附近既影响了生产厂区和周围居民的工作和生活，又造成了环境污染。部分企业将焦粉当作普通燃料处理，降低了其利用价值，并且造成生产成本上升[2]。因此，研究有效的焦粉成型技术，将焦粉加工成高附加值的产品，对于实现可持续发展具有重大意义。 以新疆三道岭半焦为原料