| 摘要 |
<p>An improved two phase basic steel refining process for phosphoric pig iron is described which comprises forming a steel having a phosphorus content of not greater than 0.025% by using a substantially stoichiometric amount of lime to neutralize silicon and phosphorus oxides formed during the refining process or contained in the mineral and metallic additions to form dicalcium silicate and tricalcium phosphate, adding all of the basic slag obtained at the end of the previous second phase in the first phase along with at most 25% of the fresh lime required, and blowing at least 80% of the total amount of oxygen required for refining during the first blowing phase followed by a thorough deslagging and entry into the second phase wherein at least 75% of the total quantity of lime is added and the remainder of the oxygen is blown, after blowing of the remaining oxygen, the hot molten slag containing bath is strongly stirred with a stirring gas and the resulting steel having a phosphorus content of not greater than 0.025% is tapped and the remaining slag is available for recycling.</p> |
