Properties of a Fireproofing Formulation Based on Liquid Glass and Mechanically Activated Aluminum Oxide

the aim of the work is to study the effect of a high-temperature plasma torch on the processes of phase transformations and layer-by-layer modification of the protective and decorative coating on concrete using as a filler a mixture of quartz sand and hollow glass microspheres. The main tasks included: investigation of the processes of evaporation and thermal diffusion of oxides of plasma-coated coatings; study of phase transformations in the melt and its subsequent crystallization in the process of rapid spontaneous cooling of the fused protective and decorative coating; study of the effect of sodium liquid glass on the processes of polymorphic transformations of alumina and the formation of micro-wicks due to the intense diffusion of sodium oxide; study of operational characteristics of protective and decorative coatings. It was established that the initial phases in the protective-decorative coating are α-Al2O3 and CaO∙6Al2O3 (β-Al2O3), and the liquid sodium glass in the coating leads additionally to the formation of Na2O∙11Al2O3. The top layer of the protective and decorative coating is Na–Ca–Al–Si glass with regions of heterogeneities containing an increased content of sodium oxide. The content of aluminum oxide in the protective and decorative coating based on the battle of high-alumina refractory was 95.1 %. The introduction into the coating composition of sodium liquid glass minimizes the processes of dehydration of the binding component and changes the chemical composition of the protective and decorative coating. Reduction of the aluminum oxide content to 83.0 % affects the microhardness indicators. Microhardness of the concrete surface due to the introduction of liquid glass is reduced from 2510 HV to 887 HV.

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Improvement of process for obtaining activated aluminum oxide

Chemistry and Technology of Fuels and Oils ◽

10.1007/bf00727114 ◽

1986 ◽

Vol 22 (10) ◽

pp. 512-515

Author(s):

V. F. Klaptsov ◽

S. A. Surin ◽

G. D. Chukin ◽

B. K. Nefedov

Keyword(s):

Aluminum Oxide ◽

Activated Aluminum Oxide

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Adsorption of As (v) from Water by Activated Aluminum Oxide

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1965 ◽

2012 ◽

Vol 476-478 ◽

pp. 1965-1968

Author(s):

Da Lei Zhang ◽

Fan Qiao ◽

Mou Lv ◽

Ying Jie Sun ◽

Qing Yuan Guo

Keyword(s):

Aluminum Oxide ◽

Adsorption Equilibrium ◽

Ph Value ◽

Adsorption Properties ◽

Operating Conditions ◽

Optimum Operating ◽

Ph Values ◽

Initial Ph ◽

Langmuir Isotherm Model ◽

Activated Aluminum Oxide

In this paper the adsorption properties of activated aluminum oxide (AAO ) to As(V) were researched. The effect of operating factors such as pH, contact time and initial As(V) concentration was investigated and the optimum operating conditions were established. Experimental results indicated that the optimal pH value adsorption of As(V)by activated aluminum oxide was from 4 to 6, and the optimum initial pH values was 5.5.The adsorption equilibrium was achieved within 5h.The adsorption capacity for As(V)increased with increasing concentration and the adsorption date was well fit by the Langmuir isotherm model. It is believed that activated aluminum oxide (AAO) is environmentally acceptable and industrially application for utilization in arsenic-containing wastewater treatment.

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