高性能改性腐植酸制备烟煤型煤实验研究

为提高烟煤型煤机械强度,以加工后的腐植酸为黏结剂制备烟煤型煤,采用单因素实验和正交实验研究了加热时间、Na OH质量分数、黏结剂加入量、加热温度对腐植酸烟煤型煤抗压强度和跌落强度的影响。结果表明:利用腐植酸制备的烟煤型煤具有良好的机械强度,粉煤成型率较高。影响腐植酸烟煤型煤机械强度的主要因素是黏结剂加入量,其次为Na OH质量分数、加热温度、加热时间。烟煤型煤制备的最佳工艺条件为:加热时间130 min,Na OH质量分数6%,加热温度90℃,黏结剂加入量15%,此时型煤抗压强度为1620.2 N/个、跌落强度为99.0%。利用改性腐植酸可制备出适用于工业生产的烟煤型煤。

Preparation of high mechanical strength bituminous briquette with modified humic acid

In order to improve the mechanical strength of bituminous briquette,the modified humic acid was adopted as binder.The influ-ence of heating time and temperature,mass fraction of NaOH,humic acid addition on compressive strength and dropping strength of bri-quette was investigated through the single element experiment and orthogonal experiment.The results showed that the modified briquette had better mechanical strength,the briquetting ratio of fine coal was high.The main influencing factor was humic acid addition,followed by mass fraction of NaOH,heating time and temperature.The optimum technological condition was that the heating time was 130 minutes,the mass fraction of NaOH was 6%,the heating temperature was 90 ℃ ,the addition of modified humic acid was 15%.Under the optimum con-dition,the compressive strength and dropping strength of briquette was 1620.2 N,99.0%.The bituminous briquette bonded by modified hu-mic acid was suitable for industrial production.