Method for preparing light plastering gypsum from semi-dry oxidation desulfurization ash
A semi-dry desulfurization and plastering gypsum technology, which is applied in the field of lightweight plastering gypsum, can solve the problems of high dosage of type II anhydrite activator and cannot be produced in large quantities, and achieve performance optimization and cost saving effects
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[0018] The invention provides a method for preparing semi-dry oxidative desulfurization ash used for light plastering gypsum.
[0019] In this method, the semi-dry desulfurization ash is firstly oxidized by heating the rotary kiln inside and outside, and the calcium sulfite in the semi-dry desulfurization ash is fully oxidized to calcium sulfate, and then the oxidized desulfurization ash is used as the cementitious material, and the inorganic filler, Lightweight plastering gypsum is obtained after the lightweight aggregate and other modifiers are evenly mixed.
[0020] The specific steps are as follows:
[0021] (1) Oxidize the semi-dry desulfurization ash through the internal and external heating rotary kiln, and fully oxidize the calcium sulfite in the semi-dry desulfurization ash to calcium sulfate;
[0022] (2) Use the oxidized desulfurization ash as the gelling material, and mix it evenly with inorganic fillers, lightweight aggregates and other modifiers.
Embodiment 1
[0025] Oxidize the semi-dry desulfurization ash in a rotary kiln at 650°C for 2 hours to fully oxidize the desulfurization ash, then weigh the following materials by weight: 61% semi-dry oxidative desulfurization ash, 23% heavy calcium powder, vitrified microbeads 7%, 9% calcium sulfate hemihydrate, and 0.25% water-retaining agent were mixed and stirred evenly to prepare lightweight plastering gypsum, and its flexural and compressive strength and bulk density were tested.
Embodiment 2
[0027] Oxidize the semi-dry desulfurization ash in a rotary kiln at 650°C for 2 hours to fully oxidize the desulfurization ash, then weigh the following materials by weight: 71% semi-dry oxidative desulfurization ash, 10% heavy calcium powder, vitrified microbeads 10%, 9% calcium sulfate hemihydrate, and 0.25% water-retaining agent were mixed and stirred evenly to prepare lightweight plastering gypsum, and its flexural and compressive strength and bulk density were tested.
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