Ca(OH)_(2)对水泥-金川镍渣提铁尾渣胶凝体系反应活性的影响  

The Effect of Ca(OH)_(2) on the Reactivity of Cement-Ferrous Extraction Tailing of Jinchuan Nickel Slag Cementitious System

作　　者：郑江华 宗红星 任学根 宋彦宁 冯琼[2] ZHENG Jianghua;ZONG Hongxing;REN Xuegen;SONG Yanning;FENG Qiong(SKL of Nickel and Cobalt Resources Compressi ve Utilization,Jinchang 737100,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]镍钴共伴生资源开发与综合利用全国重点实验室,甘肃金昌737100 [2]兰州理工大学土木工程学院,兰州730050

出　　处：《有色金属(中英文)》2025年第1期161-169,178,共10页Nonferrous Metals

基　　金：国家自然科学基金资助项目(52008196,U21A20150);甘肃省科技计划资助项目(23JRRA799)。

摘　　要：金川镍渣堆存量已超4000万t,亟待资源化、规模化消纳。提铁尾渣作为金川镍渣提铁后的二次尾渣,其反应活性较低,急需寻找一种活性提升方法。研究了Ca(OH)_(2)作碱激发剂对提铁尾渣-水泥复合胶凝体系基本性能和水化反应的影响,结合宏观-微观手段分析Ca(OH)_(2)对复合胶凝体系反应活性的激发机理。结果表明:Ca(OH)_(2)的掺入促进了复合胶凝体系的早期水化反应,凝结时间平均缩短约54%,3 d和7 d抗压强度平均分别提高27%和9.72%。水化产物的生成量增大,结构密实性增强。The stockpile of nickel slag in Jinchuan has exceeded 40 million tons,urgently requiring resource utilization and large-scale disposal.As the secondary tailings after ferrous extraction from nickel slag,the iron-extraction tailings have low reactivity and urgently require exploration of an effective method to enhance their reactivity.In order to solve the problem of low reactivity of ferrous extraction tailing of nickel slag,the effects of Ca(OH)_(2) as alkali activator on the basic properties and hydration reaction of ferrous extraction tailing of nickel slag-cement composite cementitious system were studied.The activation mechanism of Ca(OH)_(2) on the reactivity of the composite cementitious system was analyzed by macro-micro methods.The results show that the addition of Ca(OH)_(2) promotes the early hydration reactions of the composite cementitious system.The setting time is reduced by about 54%on average,and the compressive strength of 3 d and 7 d are increased by 27%and 9.72%on average,respectively.The amount of hydration products increases,and the compactness of the structure improves.

关 键 词：金川镍渣提铁尾渣 碱激发剂 力学性能 水化产物 

分 类 号：TU521[建筑科学—建筑技术科学]