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- Title
Study on the Mechanism of Gelling Performance of Sodium Carbonate-Activated Copper Tailings Based on Response Surface Method.
- Authors
LIU Yitong; YI Yuanrong; LI Chunhui; MA Jing; YANG Yaxin; ZUBAIDAIMU, Rexiti
- Abstract
To effectively stimulate the activity of copper tailings to prepare cementitious materials with good performance, copper tailings were used as the main raw materials, water glass and NaOH were added as alkali initiators, and the response surface optimization method was used to carry out the optimization experiment of cementitious material ratio, and the influence of independent variables and their interaction on the compressive strength of 28 d was studied by analysis of variance and three-dimensional curved plot. XRD, SEM, FT-IR, TG-DTG, etc. were used to characterize the mineral composition, micromorphology and other characteristics of the sample. The results show that the optimal ratio obtained by optimization experiment is 50% sodium carbonate content, 1% sodium hydroxide content and 22 g/100 g water glass content, and the compressive strength of copper tailings cementitious material in 28 d is 30. 41 MPa. After 40 min of mechanical ball milling, sodium carbonate excites the activity of copper tailings to a better state under an appropriate alkaline environment, and a large number of C-S-H gels with high crystallinity and prismatic calcium vanadium and other hydration products are generated by hydration of copper tailings, which are connected with each other to form a network structure, so that the cementitious material maintains high strength performance.
- Subjects
GELATION; COPPER; MECHANICAL alloying; COMPRESSIVE strength; SODIUM carbonate; CALCIUM silicates
- Publication
Nonferrous Metals Engineering, 2024, Vol 14, Issue 2, p142
- ISSN
2095-1744
- Publication type
Article
- DOI
10.3969/j.issn.2095-1744.2024.02.019