Consolidation Mechanism of Chloride Ion in Soda Residue from Ammonia Soda Process Method

Abstract

Soda residue-magnesium oxychloride cement is prepared with soda residue from ammonia soda process method, magnesium oxide and magnesium sulfate heptahydrate as main raw materials, and its consolidation mechanism of chloride ion is studied. The results show that the hydration products of soda residue-magnesium oxychloride cement are mainly 5-phase, gypsum and brucite, which exist in the matrix in needle rod shape, long plate shape and hexagonal plate shape, respectively. When the molar ratio of MgO/MgCl₂ is 8:1, the concentration of MgSO₄ is 29%, and the mass ratio of soda residue: magnesium oxide: magnesium sulfate heptahydrate is 45.8:36.4:17.8. The chloride ion consolidation effect of the sample is the best, and the chloride ion consolidation content of the 7 d sample is about 93%. The chloride ion consolidation content of the 28 d sample is about 96%.

Keywords

soda residue / magnesium oxychloride cement / chloride ion / hydrate composition

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