48results about How to "Reduce TFe content" patented technology

The invention relates to a bottom-blown air brick of top and bottom repeatedly blown converter and an installing structure thereof, which are mainly characterized in that two sides of the bottom-blown air brick are respectively laid with a protective brick, the height H of the bottom-blown air brick and the protective brick is more 80-120 mm than that h of a bottom working liner magnesia carbon brick, the shape size of the bottom-blown air brick is the same with the shape size of the protective bricks at two sides of the bottom-blown air brick, and the protective bricks and the bottom-blown air brick are tread gauged bricks. The invention can promote slag-metal cupping at the top of the bottom-blown air brick during the production primary period of a new converter to be rapidly produced, thereby solving the problem of blockage or burning-out of the bottom-blown air brick, ensuring the air permeability, and greatly prolonging the service life of the bottom-blown air brick, wherein the service life of the bottom-blown air brick reaches more than 20,000 furnaces. The layout structure of the air brick strengthens the mixing of molten steel in a molten pool, quickens elements in the molten pool to mutually generate the chemical reaction, and remarkably reduces the content of TFe in the slag, wherein the content of the TFe averagely reaches below 15 percent.

The invention belongs to the field of steel smelting and particularly relates to a method of separating phosphorus and vanadium by simultaneous oxidation of vanadium-bearing molten iron in a converter. The method provided by the invention aims to solve the problem that the efficiency of vanadium extraction and phosphorus removal for molten iron by a conventional method is relatively low, and reduces the content TFe in vanadium slag, so that the consumption of an iron and steel material is reduce and low-phosphorous semi-steel is provided for the steel-making converter. The method of separating phosphorus and vanadium by simultaneous oxidation of vanadium-bearing molten iron in the converter provided by the invention comprises the steps of: A, after iron is blended in the vanadium-extracting converter, descending an oxygen lance to blow, wherein the oxygen flow in the full course is controlled at 1.5-3.0Nm3 / t.min, and the intensity of bottom blowing nitrogen is 0.2-0.4N3 / t.min; B, adding lime after blowing is started, and controlling the lance position 10-30mm over a standard lance position 2min before blowing; after blowing in 1-2min, adding iron oxide scales or other high iron-bearing oxides; controlling the lance position according to the standard lance position 2min after blowing; and controlling the lance position 30-50mm over the standard lance position 2min before blowing is finished; and C, after blowing is finished, discharging semi-steel and vanadium slag.

The present invention discloses a high calcium vanadium slag recovery method comprising the following steps: adding a vanadium slag foaming inhibitor in the high calcium vanadium slag pouring process of a converter furnace and a rocking furnace, wherein the vanadium slag foaming inhibitor comprises the following chemical components by weight: 20 to 30 parts of Ca, 50 to 60 parts of Si, 2 to 4 parts of Al and 10 to 20 parts of a solid C. The vanadium slag foaming inhibitor is added into the liquid high calcium vanadium slag for rapidly reacting with the high calcium vanadium slag to reduce slag viscosity, high calcium vanadium slag foaming can be eliminated, overflowing in the slag recycling process can be prevented, high calcium vanadium slag recovery amount can be improved, slag pot and slag tanker damage can be reduced, labor intensity can be reduced, high calcium vanadium slag oxide property can be reduced, slag TFe content can be reduced, and meanwhile the high calcium vanadium slag recovery method can ensure high calcium vanadium slag chemical composition meets the follow-up vanadium extraction use.

The invention relates to a method for smelting weather resistant steel through high-phosphorus-content steel discharging by a converter. The method comprises the steps of adding waste steel liquor which is treated by KR desulfuration into the converter in a blending manner; performing slag retaining and slag making operations in the converter: retaining 3-5 tons of furnace slag of the last converter, and making slag only through light-roasted dolomite; in a converter blowing process, lifting an oxygen gun to a high position after the oxygen gun is ignited, quickly reducing the position of the oxygen gun step by step after a gas mixing stage, adding roasted dolomite and ores for cooling in the later stage of oxygen blowing, and quickly pulling carbons at the low gun position in the later stage of blowing; controlling an end point of the converter to discharge the steel. According to the method, auxiliary material consumption of the converter can be reduced, the phosphorus content of the end point of the converter is increased, the phosphorus iron consumption is alleviated, the final slag TFe content of the converter is reduced, and the iron loss in the converter blowing process is relieved.

The invention belongs to the field of iron and steel smelting and particularly relates to a method for simultaneously conducting dephosphorization and vanadium extraction on vanadium-contained molten iron through a converter. The method aims to solve the problem that a furnace lining of a converter is corroded by a conventional dephosphorization and vanadium extraction agent, part of phosphorus in the molten iron is removed while vanadium extraction is conducted, and the content of TFe in vanadium slag is reduced, so that the steel material consumption is reduced, and low-phosphorus semisteel is provided for a steel converter. The method for simultaneously conducting dephosphorization and vanadium extraction on the vanadium-contained molten iron through the converter comprises the following steps that A, after the molten iron is poured into the vanadium extraction converter, blowing is conducted through a deoxygenation lance, the oxygen flow is controlled to be 20000-35000 Nm<3> / min in the whole process, and the nitrogen bottom blowing intensity is 0.1-0.3 Nm<3> / t.min; B, after nitrogen bottom blowing is conducted for 1-2 min, the lance position is controlled according to 1.9-2.0 m, and meanwhile steel slag, ferric oxide and lime are added in sequence for slagging; C, the lance position of the deoxygenation lance is controlled to 2.0-2.2 m two minutes before blowing is finished; and D, the semisteel and the vanadium slag are discharged after blowing is finished.

The invention relates to a semi-steel smelting constant-pressure constant lance steelmaking method, and belongs to the technical field of semi-steel smelting. The semi-steel smelting constant-pressure constant lance steelmaking method is provided to reduce the process lance position fluctuation in order to fundamentally reduce the TFe content of final slag. A slagging system is optimized, and corundum slag is used to carry out early slagging and process slag adjustment in order to reach semi-steel smelting rapid slagging and reduce process drying. The TFe content and splash are fundamentally reduced through constant-pressure constant lance operation without special slag modifying treatment. The method has the advantages of simplicity in operation, low cost, reduction of the drying and splashing probability in the semi-steel smelting process, stationary process, and realization of control of the TFe content of the final slag within 17%.