Wettability and corrosion of molten sodium carbonate on aluminum-silicon refractory
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The corrosion and infiltration of refractory by chemical waste liquid rich in alkali ions such as potassium and sodiumare the main cause of material damage. Their service life varies with the material systems. In this work, threekinds of aluminum-silicon refractories were prepared by using alumina, mullite, andalusite and clay as raw materials. Staticcrucible method was used to carry out alkali corrosion test at 900 ℃, and Na2CO3 was used as corrosive agent. The phasesand microstructures of the residual crucibles were examined by means of X-ray diffraction (XRD) and scanning electronmicroscope (SEM). The wetting process of molten Na2CO3 on refractory was detected by high temperature contact anglemeasurement system. The corrosion and infiltration resistance of refractories were discussed based on their wettability. Theresults show that corundum-mullite system has weak ability to resist corrosion and infiltration of the molten Na2CO3. Bycontrast, high-purity mullite system has better performance. The mullite transformed from andalusite can improve its infiltrationresistance. The infiltration of molten Na2CO3 into refractory is related to its wetting ability, they both determine thedamage degree of refractories.
Abstract
The corrosion and infiltration of refractory by chemical waste liquid rich in alkali ions such as potassium and sodiumare the main cause of material damage. Their service life varies with the material systems. In this work, threekinds of aluminum-silicon refractories were prepared by using alumina, mullite, andalusite and clay as raw materials. Staticcrucible method was used to carry out alkali corrosion test at 900 ℃, and Na2CO3 was used as corrosive agent. The phasesand microstructures of the residual crucibles were examined by means of X-ray diffraction (XRD) and scanning electronmicroscope (SEM). The wetting process of molten Na2CO3 on refractory was detected by high temperature contact anglemeasurement system. The corrosion and infiltration resistance of refractories were discussed based on their wettability. Theresults show that corundum-mullite system has weak ability to resist corrosion and infiltration of the molten Na2CO3. Bycontrast, high-purity mullite system has better performance. The mullite transformed from andalusite can improve its infiltrationresistance. The infiltration of molten Na2CO3 into refractory is related to its wetting ability, they both determine thedamage degree of refractories.
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