2results about How to "Shorten the refining cycle" patented technology

The invention discloses an accurate control method for Al2O3 / MnO value in 1215MS steel refining slag, which comprises the following steps: adding ferro-aluminum when 1 / 4 of converter tapping is performed, adding lime and wollastonite when 1 / 3 of converter tapping is performed, and controlling the converter slag amount in the tapping process to be 1-4kg / t steel; in the LF refining heating process, aluminum slag and metallurgical lime are added; the adding amount of the aluminum slag is controlled to be 3.3-4.0 kg / t, 2.6-3.2 kg / t or 2.0-2.7 kg / t steel; in the LF refining heating process, the temperature is controlled to be 1600-1620 DEG C, and aluminum cut shots, lime and wollastonite are added in batches for strong stirring and slagging; according to the method, Al2O3 / MnO in the refining slag can be accurately controlled within the range of 1.90-2.20, the content of dissolved oxygen in molten steel at the LF refining end point can be accurately controlled, the LF refining period is shortened, the proportion of fusiform sulfide inclusions in steel is effectively increased, and the cutting performance of a product is improved.

The utility model belongs to the field of powder spraying metallurgy technique, disclose a kind of RH furnace pressure circulation powder spraying system, by immersion type injection lime powder in RH riser, improve RH furnace desulfurization capacity, promote molten steel purity;Reduce raw material consumption, improve metallurgical effect.It include refining ladle, RH furnace body and powder spraying tank;RH furnace body is located above refining ladle;The side of RH furnace body is equipped with booster inlet, booster inlet is connected with booster pump by pipeline, and gas pressurization is passed to RH furnace body by booster inlet;The other side of RH furnace body is equipped with powder spraying port, and powder spraying port is connected with powder spraying tank and booster gas source respectively by pipeline;Powder of powder spraying tank is carried out powder spraying operation to the inside of RH furnace body by powder spraying port, and booster gas source is used to provide conveying power for powder.