Foam Slag Inhibitor

Causes of splashing in converter steelmaking

Splashing is common in converter steelmaking. The density of molten steel in the furnace is about 7.0t/m3, Density of slag 3.2t/m3, The slag covers the molten steel. exist Below 1470°C, the carbon-oxygen reaction is inhibited. 147 0°C or above, it can proceed smoothly. If the operation is improper (such as the second batch of slag is not added properly),  The slag temperature will drop to Below 1470°C, Oxygen supply causes the enrichment of (FeO) in the slag. Then as the temperature rises to 1470° C or above, carbon and oxygen react violently, instantly producing a large amount of CO Gas, slag serious foaming, due to CO The gas cannot be discharged in time. This causes an explosion  Fluid splashing.

.  Measures to mitigate splashing

In order to control the carbon-oxygen reaction rate in the furnace and reduce slag splashing, the current solutions are: One is to change the gun position and oxygen supply system, but this method usually lags behind the reaction and is a remedial measure with unsatisfactory effect; the other is to change the slag composition in time before or after the splashing signs appear . When the foam slag inhibitor is added just after splashing, it will react quickly with the slag to increase the slag viscosity and reduce the (FeO) content in the foam slag.

CO mitigation The reaction causes the metal droplets in the foam slag to settle, which can effectively suppress the occurrence of splashing. After comprehensive consideration, it was decided to use foam slag to suppress Preparations are used to reduce the occurrence of splashing. The reaction of CaO content to converter slag viscosity and melting point shows that the increase of CaO content causes the increase of slag viscosity. Therefore, a certain amount of CaO should be added when designing the inhibitor composition. At the same time, adding flammable and volatile substances is beneficial to  Eliminate stagnation in slag CO bubble.

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