摘要
基于大宗固废利用原则,进行煤矸石机械-热-化学复合活性激发探索试验。研究发现,原状煤矸石由于碳等挥发分较多,直接机械粉磨后活性较低,不能替代水泥用于混凝土材料;煤矸石经温度950℃热活化后制备的胶砂试样的28 d抗压强度可达39.77 MPa,活性指数达到了84.3%;配加10%生石灰,焙烧温度950℃条件下,由煤矸石制备的胶砂试样的28d抗压强度达到43.07 MPa,活性指数达到了87.8%;配加7.5%工业石膏,焙烧温度950℃条件下,由煤矸石制备的胶砂试样的28 d抗压强度达到了45.68 MPa,活性指数达到了85.7%;焙烧温度950℃,配比为3.75%工业石膏和3.75%生石灰时,由煤矸石制备的胶砂试样的28d抗压强度值相对稳定,活性指数超过了100%,可替代部分水泥。从节能减排角度考虑,宜选用的煤矸石活性激发条件为:配加3.75%工业石膏+3.75%生石灰,焙烧温度950℃,焙烧时间30 min。
Based on the principle of bulk solid waste utilization,the exploration test of mechanical-thermal-chemical composite activity stimulation of coal gangue was carried out.It is found that the original coal gangue has low activity after direct mechanical grinding due to the large amount of volatiles such as carbon,and cannot replace cement for concrete materials.The 28 d compressive strength of the mortar sample prepared by thermal activation of coal gangue at 950℃can reach 39.77 MPa,and the activity index reaches 84.3%.Under the condition of adding 10%quicklime and roasting temperature of 950℃,the 28 d compressive strength of the mortar sample prepared by coal gangue reaches 43.07 MPa,and the activity index reaches 87.8%.Under the condition of adding 7.5%industrial gypsum and roasting temperature of 950℃,the 28 d compressive strength of the mortar sample prepared by coal gangue reaches 45.68 MPa,and the activity index reaches 85.7%.When the roasting temperature is 950℃and the additive ratio is 3.75%industrial gypsum and 3.75%quicklime,the 28 d compressive strength value of the mortar sample prepared from coal gangue is relatively stable,and the activity index exceeds 100%,which can replace part of cement.From the perspective of energy saving and emission reduction,the suitable conditions for the stimulation of coal gangue are as follows:additive ratio 3.75%industrial gypsum+3.75%quicklime,roasting temperature 950℃,roasting time 30 min.
作者
陈奎元
代文彬
苟海鹏
陈学刚
徐小锋
CHEN Kuiyuan;DAI Wenbin;GOU Haipeng;CHEN Xuegang;XU Xiaofeng(China ENFI Engineering Corporation,Beijing 100038,China)
出处
《绿色矿冶》
2025年第6期77-86,共10页
Sustainable Mining and Metallurgy
基金
国家重点研发计划(2023YFC2908003)
云南省科技厅重大科技专项计划(202302AB080014)
五矿科创基金(YG2302)。
关键词
煤矸石
活性激发
复合激发
焙烧温度
活性指数
coal gangue
active stimulation
compound stimulation
roasting temperature
activity index
