文章信息/Info

Title:

Effect of Grinding Aids and RO Phase Separation on Cementitious Activity of Steel Slag

文章編號:

1674-3962(2024)07-0644-08

作者:

嵇鷹;  白龍;  朱剛; 劉璽;  樊帥

1. 西安建筑科技大學材料科學與工程學院，陜西 西安 710055 2. 中國建筑材料工業建設西安工程有限公司，陜西 西安 710065

Author(s):

JI Ying;  BAI Long;  ZHU Gang;  LIU Xi;  FAN Shuai

1. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2. China Building Materials Industrial Construction Xi’an Engineering Co., Ltd., Xi’an 710065, China

關鍵詞:

鋼渣; 助磨劑; RO相; 解離; 活性指數

Keywords:

steel slag;  grinding aids;  RO phase;  liberation;  activity index

分類號:

TQ177;X757

DOI:

10.7502/j.issn.1674-3962.202211010

文獻標志碼:

A

摘要:

針對鋼渣易磨性差、活性低的問題，采用加入助磨劑和RO相分選的方法以降低能耗和提高其活性。通過加入6種助磨劑后對鋼渣進行粉磨，探究助磨劑對鋼渣粉比表面積、粒度分布、RO相解離度的影響；并對粉磨后的鋼渣粉進行RO相分選，研究分選對鋼渣RO相含量、活性和水化微觀性能的影響。結果表明：助磨劑和RO相分選對鋼渣的膠凝活性提高作用明顯。助磨劑的加入改善了鋼渣粉的粒度分布均勻性，增加了粒徑為3~32 μm的顆粒含量，提高了鋼渣粉的比表面積和RO相解離度，分選降低了鋼渣粉中RO相的含量。助磨劑TD（三異丙醇胺和二乙二醇按質量比1∶1復配）的助磨效果最好且對RO相的解離效果達到最大，分選后鋼渣粉中RO相含量降低了38.58%，鋼渣粉摻量為30%時7和28 d活性指數相較于空白組分別提高了27.32%和21.48%。

Abstract:

Aiming at the problems of poor grindability and low activity of steel slag, the method of adding grinding aids and RO phase separation was adopted to reduce energy consumption and improve its activity. The steel slag was ground by adding six kinds of grinding aids, and the effects of grinding aids on the specific surface area, particle size distribution and RO phase liberation degree of steel slag powder were investigated. After grinding, the steel slag powder was separated by RO phase, and the effects of separation on RO phase content, activity and hydration microscopic properties of steel slag were discussed. The results showed that grinding aids and RO phase separation can significantly improve the cementitious activity of steel slag. The addition of grinding aid improved the uniformity of particle size distribution of steel slag powder, increased the particle content of 3~32 μm, increased the specific surface area and RO phase liberation degree of steel slag powder, and reduced the RO phase content of steel slag powder by separation. The grinding aid TD (mixed with triisopropanolamine and diethyleneglycol 1∶1) has the best grinding aid effect and the largest liberation effect on the RO phase. After separation, the content of RO phase in steel slag powder is reduced by 38.58%. When the steel slag powder content is 30%, the activity index of 7 and 28 d is increased by 27.32% and 21.48% respectively compared with the blank group.