Slag attack

In summary, the main reasons for the refractory failure in gasifiers include high temperature, large and quick temperature changes, erosion by particulate, molten slag attack, slag variation from the feedstock, hot corrosive gases, and alkali vapor attack.48... 

P. S. Dear, Study of soda-ash foundry-slag attack on the refractory lining of a teapot-type, reservoir ladle. Bull. Am. Ceram. Soc. 17(3), 4-8 (1938). 

Corrosion. Wear caused by chemical action (cf. abrasion and erosion (q.v.). See also slag attack. ASTM C 621 and C 622 describe tests for the resistance of refractories to corrosion by molten glass. 

Diopside. Mg0.Ca0.2Si02 m.p. 1392°C sp. gr. 3.3 thermal expansion (0-1200 C) 8.8 X10-6. There is a deposit in New York State. Trials have been made with synthetic diopside as a high-frequency electro-ceramic. It is formed as a devitrification product of sodalime glass if the CaO is partially replaced by MgO it is also formed when siliceous slags attack dolomite refractories. 

Drip Course. A protruding or recessed course inside the crown of a glass tank, to prevent molten material running down and corroding the breast walls. Drip Test. See slag attack tests. Drop Arch. An auxiliary brick arch projecting below the general inner... 

Lamination. (1) Textural inhomogeneity in clayware resulting from the shaping process and particularly common in products that have been extruded. In structural clay products, lamination is a source of mechanical weakness and a cause of poor frost-resistance in refractory products lamination may reduce resistance to slag attack and to thermal shock. 

Pilkington Bros. Ltd., England, in 1937. (For a more recent process introduced by this firm see float glass process.) Pill Test. See slag attack tests. Pillar. (1) A column of brickwork for example the refractory brickwork between the doors of an open-hearth steel furnace. 

Rotary Disk Feeder. See disk feeder. Rotary Drum Test. See slag attack TESTS. 

Slag Attack Tests. Refractories are attacked by the corrosive slags formed during metallurgical processes. Various simulative tests have been devised to assess the resistance of refractories to slag attack. 

Figure 2 Stage I of slag attack (showing a bonded refractory).

Slag attack rate, i.e., refractory recession, in cm/s Solubility of refractory in slag in kg of refractory/kg of slag Absolute temperature of the refractory hot face Slag viscosity in poises... 

In essence, the corrosion rate is inversely proportional to slag viscosity. This is probably why refractories exhibit some coherence in Stage El of slag attack because solution of refractory in the slag has increased viscosity at the slag-refractory interface. 

Herron RH, Beechan CR, Padfield RC. Slag attack on carbon-bearing basic refractories. Amer Ceram Soc Bull 1%7 46 1163-1168. 

Graphite/Carbon C Reduce metal, slag attack... 

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