1983 Volume 69 Issue 15 Pages 1738-1745
Optimum silicon contents in hot metal are estimated from the data based on the commercial converter operation in this paper.
Estimations of optimum silicon content are tried in the case with or without the dephosphorization process between blast furnaces and converters. Metallurgical and economical evaluations are also made for several desiliconization methods.
The results are summarized as follows:
(1) Optimum silicon content on the process without hot metal dephosphorization treatment at [P] = 0.110%
If tapping-temperature is 1 700°C, optimum [Si]≅0.40%
If tapping-temperature is 1 610°C, optimum [Si]≅0.20%
(2) Optimum silicon content on the process with hot metal dephosphorization treatment by soda ash [Si]≤0.10%
(3) Economical evaluations for hot metal desiliconization treatment
(i) In the case of using iron oxide as desiliconization reagent
If [Si] initial≥040%, BF runner method is better.
If [Si] initial<0.40%, torpedo injection method is better.
(ii) In the case of refining a high manganese steel, the largest benefit would be obtained by the desiliconization treatment with manganese are on blast furnace runner, combining the dephosphorization treatment by soda ash and less-slag blowing in top and bottom blowing converter.
