Decarburisation rate

In Figure 4, the critical point, where the change from a constant decarburisation rate to a rate controlled by carbon concentration takes place, is found to be at 13.5 min at a carbon concentration of 0.006. From this, the exchange ratio between the bath and the metal-slag reaction zone defined as tnMetai-siag " totai calculated to be 0.7. 

As discussed above, Equation (8) is valid for process conditions up to the critical point. The decrease in decarburisation rate from the critical point onwards results in a decrease in CO production and, therefore, less stirring is caused by the gas hubbies. Hence, mass transfer in tbe form of metal droplets in the slag decreases. 

The task of developing a suitable converter model will be discussed based on the decarburisation reaction of the iron melt. Obviously, the rate of the decarburisation reaction depends on the reaction rate of... 

Another viewpoint has been developed by Ham(6i) and his co-workers. These authors find that the slopes of permeation rate-pressure isotherms for hydrogen-nickel systems are not exactly 0-5, as Fig. 58 shows. The deviations from a Jp law are at a maximum near the Curie point, and are related to the purity of the specimen of nickel employed. The isotherms do not have a slope of 0 5 near the Curie point unless the nickel is thoroughly decarburised. Similarly, the isotherms for carbonyl iron(6i) at 500° C. remained with an exponent well above 0 5 until the carbon was removed. The authors... 

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