30results about How to "Improve converter operating rate" patented technology

The invention relates to a method for repairing a converter through waste magnesia carbon bricks. The method comprises the following steps that the to-be-repaired converter is tapped; terminal slag after tapping is directly poured without slag splashing until to-be-used brick fillers are covered with the terminal slag; a pre-calculated amount of brick fillers are added into the to-be-repaired converter, and forms a molten material together with the terminal slag; according to the converter repairing position, the converter is shaken, and thus the molten material can cover the to-be-repaired position; the to-be-repaired converter is sintered for 30 minutes or longer until the terminal slag is solidified; and iron is fed, and next batch of smelting is conducted. According to the method for repairing the converter, the problems of long sintering time, poor converter repairing effect, high converter repairing cost, serious environmental pollution and the like can be effectively solved, byreasonably controlling converter terminal slag, the effect that a mixture of the converter terminal slag remaining in the converter and the waste magnesia carbon bricks is effectively bonded to the repairing position of a converter lining is achieved, and finally the broken converter is repaired.

The present invention provides a siliconeisen iron melt blowing and refining method in a converter, and the method includes the steps as follows: (1) waste steel and iron melt are loaded into the converter, and oxygen blowing and steel making begin, the oxygen flux is 900Nm3 / min to 1050Nm3 / min, the height that the oxygen gun spraying head departs the metal liquid surface in the melt pond is 1.8-3.0m; (2) a first batch of slag charge is added after oxygen is blown in the first batch of the slag charge is 60-80 percent of the total slag charge, and the rest slag charge can be charged in 2-3 batches after the first batch of the slag charge is melted. The consumption of the slag charge: the lime 18-28kg / t steel, the light calcined dolomite 15-25kg / t steel, the ironstone 5-10kg / t steel, thecarbonaceous heat generating agent 0-7kg / t steel, the compound slag 0-6kg / t steel; and the rest process are same as the prior art. The oxygen blowing duration of the present invention decreases 1.8min per furnace averagely, and the problem that the heat quantity is short and the slag forming is difficult can be solved simultaneously, and the present invention can make the converter steel-making to produce efficiently.

The invention relates to a slag stopping material, a slag stopping method and a combined technology method of slag stopping and slag splashing protection. The sum of mass percentages of CaO, MgO and C in the slag stopping material accounts for over 40% of the total mass of the slag stopping material, igloss is smaller than 47% of the total mass of the slag stopping material, and the mass percent of C is not more than 25% of the total mass of the slag stopping material. The slag stopping method comprises the step of putting a certain amount of slag stopping material on the liquid level area over a steel tapping hole in a converter. The slag stopping material, the slag stopping method and the combined technology method of slag stopping and slag splashing protection have the following beneficial effects: roughing slag amount is reduced, the thickness of the slag blanket in a ladle is thinned obviously, the tasks of deoxidation of molten steel in the ladle and modification of top slag are relieved, the consumption of deoxidizer is lessened, the phenomena of rephosphorization and silicon pick up in the refining process of the molten steel are reduced, the consumption of slag regulating materials is lowered, the time of molten steel refining is shortened and the smelting cost is decreased; and after steel tapping is finished, the slag stopping material can be directly used as a slag splashing protection material, the use amount of the slag splashing protection material is reduced, the time of slag splashing protection is shortened and the working efficiency of the converter is enhanced.

The invention provides a maintaining method for a converter lining. After tapping of a converter, slag splashing treatment is not conducted, the flaw position of the converter lining is filled with a mending agent, and standing sintering is conducted. The mending agent comprises filler and slag. The filler comprises raw dolomite and lime stone, wherein the mass ratio of the raw dolomite to the lime stone is 4:(7-1). According to the provided method, after tapping of the converter, slag splashing treatment is not needed, the slag and the filler with the limited mass proportion relationship are mixed, the flaw position of the converter lining is filled in a targeted manner, standing sintering is directly conduced, and accordingly maintaining of the converter lining can be finished. The maintaining process is simple, the consumed time is short, and maintaining of the converter lining can be finished in 5-8 min.

The invention discloses a composite cooling agent for steelmaking and a production process, which consists of 50-70% of steelmaking discharge sludge, 15-30% of continuous casting scale, 2-6% of magnesium chloride, 1-3% of It is composed of humic acid, 2-7% bentonite, and 10-20% dust return material. After removing impurities, the sludge recovered from the sewage discharged from steelmaking and the iron oxide scale of continuous casting are respectively placed on the hollow iron plate. Wet sludge is heated and dried to make slag-like granular raw materials, then dried again to 6-8% water content, mixed according to the raw material ratio, and then pressed to form a spherical billet, and the billet is put into the rotary kiln , preheated for 20-30 minutes, then heated to 900-1000 degrees, and calcined into products at high temperature for 40-60 minutes. The composite cooling agent for steelmaking in the present invention can flexibly and effectively adjust the steelmaking temperature, reduce the difficulty of temperature control, shorten the smelting time, increase the steel output, save the steelmaking cost, optimize the carbon-oxygen reaction in the steelmaking furnace, and increase the metal yield. Efficiency, reducing the discharge of pollutants, improving the effect of energy saving and emission reduction, has good economic and social benefits.

The invention discloses a converter slag repair charge, which is mainly characterized in that during the converter smelting process, the ΣFeO in the converter slag is controlled at 8% to 12%, and a reducing agent active metal or its alloy is added to the slag after tapping to make the FeO in the slag is all reduced, so that the slag system becomes a CaO-SiO2 binary system or CaO-MgO-SiO2 ternary system refractory material, and it is attached to the furnace wall by shaking the furnace or blowing with N2 to achieve refractory purpose of the furnace. Because the present invention adopts the above scheme, compared with the prior art, the present invention has the advantages of simple, easy, quick and effective furnace repairing operation.