摘要
为了实现某铅锌矿冶炼厂炼铅炉渣的废物再利用,针对该铅锌矿超细全尾砂,通过机械活化和化学活化两种方式研究炼铅炉渣制备矿山用充填胶凝材料的可能性。首先采用机械活化的方式,将炼铅炉渣分别粉磨80 min、100 min和120 min以获得不同细度的炉渣粉,对其进行粒度分析。然后选取NaOH和水泥熟料混合后组成的复合激发剂,开展炼铅炉渣-水泥复合充填胶凝材料正交试验。最后,利用X射线衍射仪(XRD)和扫描电镜(SEM)对炼铅炉渣-水泥复合充填胶凝材料的水化机理进行了综合分析。结果表明,炼铅炉渣细度是影响炼铅炉渣-水泥复合充填胶凝材料充填体强度的主要因素,当料浆质量浓度为74%,灰砂比为1∶4,炼铅炉渣D(50)为19.93μm,炼铅炉渣掺量为40%,NaOH掺量为4%时能够满足某铅锌矿嗣后充填法采矿的强度要求。炼铅炉渣-水泥复合充填胶凝材料主要水化产物为C-S-H凝胶,与水泥胶凝材料相比,炼铅炉渣-水泥复合充填胶凝材料与超细全尾砂的胶结性能更好,充填体的结构更加致密,不同龄期下的抗压强度均更高。
In order to realize the waste utilization of lead smelting slag(LSS)in a leadzinc mine smelter,the possibility of preparing filling cementitious material for mine by mechanical activation and chemical activation was studied.Firstly,the LSS were ground for 80 min,100 min and 120 min by mechanical activation to obtain slag powder with different fineness,and the particle size were carried out respectively.Then,the composite activator composed of NaOH and cement clinker were selected to carry out the orthogonal test of LSS-cement composite filling comentitious material.At last,the hydration mechanism of LSS-cement composite filling comentitious material was analyzed by XRD and SEM.The results show that the fineness of the slag is the main factor affecting the strength of the LSS-cement composite filling comentitious material backfill body.When the solid content of the slurry is 74%,the cement to tailings ratio is 1∶4,the D 50 of slag is 19.93μm,the content of the slag is 40%,and the content of NaOH is 4%,it can meet the strength requirements of the later filling mining of a lead zinc mine.Compared with cement cementitious material,the main hydration products of LSS-cement composite cementitious material are C-S-H gels.The cementing performance of LSS-cement composite cementitious material is better,and the structure of backfill body is more compact,and the compressive strength of backfill body at different age is higher.
作者
邢行
杨仕教
XING Xing;YANG Shijiao(School of Resource&Environment and Safety Engineering,University of South China,Hengyang 421001,China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第7期2232-2240,共9页
Bulletin of the Chinese Ceramic Society
关键词
炼铅炉渣
超细全尾砂
复合胶凝材料
正交试验
微观机理
lead smelting slag
superfine tailing
composite cementitious material
orthogonal test
micro mechanism
