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- Title
Effect of surfactant on microstructure of magnesia foam slurry and porous aggregates.
- Authors
Sun Gege; Li Guo-hua; Jiao Changfa; Tian Lin
- Abstract
Magnesia foam slurry and porous magnesia aggregate were prepared by direct foaming with light-burned magnesia powder as the raw material and sodium dodecyl benzene sulfonate (SDBS) as the surfactant. Effects of surfactant SDBS on the microstructure of aqueous foam, magnesia foam slurry, and porous magnesia aggregate were studied. The results show that: (1) in aqueous foam, with the increase of the SDBS addition, the liquid films of aqueous foam thicken, the shape of foam changes from polygon to circle, and the foam stability increases; (2) the bubbles in the magnesia foam slurry are spherical, and magnesia coats around the bubbles to hinder the liquid film drainage and gas diffusion; (3) from magnesia foam slurry to porous aggregates, the number of aggregate pores decreases and the size increases, forming closed circular pores; when the SDBS addition exceeds 3 mass%, the pore shapes are incomplete; (4) the porous magnesia aggregate with the SDBS addition of 1% -4% (by mass) sintered at 1 600 °C has an average pore size of 40.83 -92.90 µrn and a porosity of 51.6% -73.9%.
- Subjects
LIQUID films; SLURRY; FOAM; MAGNESIUM oxide; MICROSTRUCTURE; SURFACE active agents; RAW materials
- Publication
Refractories / Naihuo Cailiao, 2024, Vol 58, Issue 2, p161
- ISSN
1001-1935
- Publication type
Article
- DOI
10.3969/j.issn.1001-1935.2024.02.013