复合碱型腐植酸型煤粘结剂的特性研究

研究了从云南褐煤提取型煤腐植酸粘结剂的过程,主要考察了煤碱质量比和不同碱性添加物包括NaOH,Na4P2O7,Na2CO3和K2CO3等对腐植酸提取率的影响,并进行了成本估算。结果表明,在利用NaOH的条件下,煤碱质量比在10∶1与12∶1之间获得较好提取效果;与利用单一NaOH添加剂相比,在总碱量略有减少的前提下,用Na4P2O7和Na2CO3替代部分NaOH使腐植酸的提取率增加18.4%,粘结剂的粘度提高30%,经济成本下降2.6%。腐植酸钾型型煤的气化效果好于钠型,跌落强度基本相同。 Humic acid was extracted from Yunnan lignite,which is widely used as a binder of coal briquette.The study is focused on the influence of mass ratio of coal to alkali and different alkali additives such as NaOH,Na4P2O7,Na2CO3 and K2CO3 on the extraction rate of humic acid.The results show that only using NaOH as an alkali,the humic acid binder could be prepared efficiently under the condition that the coal/NaOH ratios are from 10∶1 to12∶1.Compared with only using NaOH,the use of Na4P2O7 and Na2CO3 which partly replaced NaOH could enhance the extraction rate of humic acid by 18.4% and viscosity of binder by 30%,and save the cost by 2.6%.The gasification performance of humic potassium briquette is greater than humic sodium briquette,fall strength of which are almost same