WU Peng, ZHANG Tao, GENG Yuqian, HUANG Shibo, WANG Wenxin, LYU Xianjun
(College of Chemical and Biomedical Engineering, Shandong University of Science and Technology, Qingdao 266590, China)
Abstract: The physicochemical properties of soda residue were analyzed at first, then the research progress of soda residue in preparation of cementitious materials was reviewed and the existing problems and future research direction were also discussed.The results show that chemical compositions of soda residue are mainly CaCO3, CaCl2, NaCl, Ca(OH)2, CaSO4, etc.The pH value is generally from 10 to 12 and the mass fraction of particles with a particle size of ≤25 μm can reach more than 95%.Soda residue is a kind of porous aggregate particle with well-developed pores.The Ca(OH)2 contained in soda residue can provide an alkaline environment for the hydration of pozzolanic materials.CaCl2, NaCl, CaSO4 and other components can form crystalline hydration products with silica-alumina components in pozzolanic materials.The soda residue-slag composite cementitious material with compressive strength of 20.7 and 42.2 MPa at 3 and 28 days can be prepared using alkali slag and slag.As calcium material in the process of firing cement, alkali slag can be fired into Portland cement clinker with strength grade up to 52.5, and its compressive strength at 3 and 28 days can reach 23.4 and 53.1 MPa respectively.Soda residue can also be used in flue gas desulfurization, sewage treatment, improving acid soil and other aspects.In future, the preparation of high-strength soda residue based cementitious materials and strengthen the exploration of application areas where the content of soluble chloride is not strictly required should be pay more attention.
Keywords: soda residue; physicochemical properties; pozzolanic materials; cementitious materials; compressive strength
中图分类号：X781.2 文献标志码：A
文章编号：1008-5548(2022)01-0035-08
DOI:10.13732/j.issn.1008-5548.2022.01.004
收稿日期： 2021-06-05，修回日期：2021-10-20，在线出版时间：2021-12-01。
基金项目：国家自然科学基金项目，编号：51674161；山东科技大学人才引进科研启动基金项目，编号：2017RCJJ036。
第一作者简介：吴蓬(1988—)，男，讲师，博士，硕士生导师，主要研究方向为矿物资源综合利用。E-mail：sdustwu@126.com。
通信作者简介：吕宪俊(1965—)，男，教授，博士，博士生导师，主要研究方向为矿物资源综合利用。E-mail：lyuxianjun@126.com。
