30results about How to "Increase package age" patented technology

The invention discloses a ladle lining casting technology, which comprises the following steps: 1) detaching ladle slag brick, cleaning slag on the ladle wall working layer, reacting layer and deteriorated layer, 2) placing the mould to locate, 3) casting between mould and ladle wall with the same material as working layer, 4) stripping after health preserving, 5) toasting.

The invention discloses a steel ladle structure and a manufacturing method thereof. A protective layer is arranged between a ladle body permanent layer and a working layer. The manufacturing method comprises the building steps of (1) building a ladle bottom, specifically, firstly, bottoming in a steel ladle shell by using a semi-light refractory castable, building refractory bricks on the semi-light refractory castable, and building a ladle bottom platform; (2) attaching a heat preservation layer, specifically, tightly attaching two layers of nanometer heat insulation plates to the inner wallof the steel ladle shell; (3) building a protective layer and a working layer, specifically, building protective layer refractory bricks on the ladle bottom platform, then building working layer refractory bricks, and forming a double-ring brick structure; (4) pouring a ladle body permanent layer, specifically, injecting a semi-light castable between the nanometer heat insulation plate and the protective layer bricks every 2-3 layers of double-ring bricks are built, constructing the ladle body permanent layer, and repeating the step until the edge of a steel ladle opening is reached; and (5) punching a hole in the peripheral steel ladle shell of the steel ladle slag line area to install a thermocouple, and connecting a temperature display. According to the invention, the safety of the steel ladle is effectively improved, the heat loss of molten steel is reduced, and the maintenance workload and material consumption of the steel ladle are greatly reduced.

The invention discloses a steel ladle. According to different erosion mechanisms and different erosion speeds of all zones inside the steel ladle, a ladle bottom working layer is arranged to be an impacting zone and a non-impacting zone, a ladle wall working layer is arranged to be a bath zone, a bath transition zone and a slag line zone, refractory material specifications of the ladle bottom working layer and the ladle wall working layer are adjusted accordingly, the thickness and height of a refractory material are increased in a zone with the higher erosion speed, an erosion transition beltis formed, the erosion speed of a serious erosion zone is decreased, meanwhile, a slow erosion zone can be indirectly protected, the overall service life of the steel ladle refractory material is prolonged, and the ladle life of the steel ladle is further prolonged effectively. The invention further discloses a construction method of the steel ladle. The using ladle life of the steel ladle constructed by the method can reach 48-55 furnace times, the turnover period of the steel ladle is increased while the ladle life of the steel ladle is prolonged, and the construction cost is reduced.

The invention belongs to the technical field of refractory materials, and relates to an unfired magnesia carbon brick as well as a preparation method and application thereof. The unfired magnesia carbon brick comprises the following components of: 2% to 6% of C, 87% to 92 % of MgO, 1% to 5% of SiO2, 1% to 3 % of CaO and 1% to 3 % of Al2O3. In actual production, the unfired magnesia carbon brick provided by the invention is used in a VOD steel ladle, so that the consumption of a refractory material of the steel ladle can be reduced, the service life of the steel ladle is prolonged, the number of vacuum smelting furnaces of the steel ladle is increased to 15 from 3, the service life of the steel ladle is increased to 80 furnaces from 28 furnaces, meanwhile, the production cost is reduced, and the purity of molten steel is favorably controlled. The unfired magnesia carbon brick comprises carbon, magnesium oxide, silicon dioxide, calcium oxide and aluminum oxide in specific quantities, the components are simple and easy to obtain; and when the unfired magnesia carbon brick is used in the VOD steel ladle, the erosion resistance, oxidation resistance and thermal shock resistance of the steel ladle can be remarkably improved.

According to the method for producing the deformed steel bar and reducing the erosion rate of the steel ladle slag line, the content of Al2O3 in steel ladle top slag is controlled to be about 15%, the content of MgO is controlled to be about 10%, the content of (FeO + MnO) is controlled to be 2.6% or below, the alkalinity (CaO/SiO2) is controlled to be 1.8-2.0, the foaming performance of the steel ladle top slag can be effectively improved, the submerged arc effect is improved, and the service life of the steel ladle top slag is prolonged. The heating rate is increased, the smelting period is shortened, and the influence of electric arc on slag line bricks is reduced. In addition, by increasing the content of MgO, the solution loss rate of magnesia in the slag line magnesia carbon brick can be effectively inhibited, the erosion rate of the slag line brick is reduced, and the ladle life of a steel ladle is prolonged.

The composition of coverflux contains (wt) SiO2 10%-20%, Al2O3 1%-5%, CaO 50%-60%, MgO 5%-12%, Fe2O3 1%-3%, MnO 0.01%-0.1% and fixed carbon 0%-1%. Said coverflux possesses proper melting point and good heat-insulating property, can prevent secondary oxidation of molten steel, and can prolong ladle life.

The invention discloses a method for prolonging the service life of steel ladle slag line bricks. The adopted control method comprises the steps that the thickness of the slag line bricks on the firstlayer to the sixth layer is changed and designed into 210 mm; the thickness of the slag line bricks on the seventh layer is maintained as originally designed 230 mm; the thickness of the slag line bricks on the eighth layer to the twelfth layer is changed and designed into 250 mm; the thickness of the slag line bricks on the seventh layer is maintained as originally designed 230 mm; and the thickness of the slag line bricks on the fourteenth layer is maintained as originally designed 210 mm. By means of the method, on the premise of guaranteeing that the volume of a steel ladle is not changed, that is, the tapping amount of a converter is not changed, the corrosion speed of the slag line bricks is reduced, the use number of the slag line bricks is effectively improved, and the ladle age is increased.

The invention relates to the technical field of refractory castables, and specifically to a steel ladle castable taking alumina-based homogenized material as matrix. The steel ladle castable is prepared by taking the alumina-based homogenized material with the alumina content of 75-80% as an aggregate, and alumina micro-powder, silicon dioxide micro-powder, pure calcium aluminate cement and a binding agent as auxiliary materials, and the content of the alumina-based homogenized material with the particle size larger than 8 mm and smaller than or equal to 25 mm is smaller than or equal to 5%. And the particle size of the binding agent is controlled below 1mm. According to the invention, a raw material grading control technology is combined with a superfine powder technology; the grain composition of the homogeneous material, especially the amount of large particles, is adjusted, so that the overall erosion resistance of the castable is improved, the overall ladle life of a steel ladle is prolonged, the ladle life of an existing steel ladle is prolonged from 110 times to 160 times or above, and more benefits of 4000-6000 tons of steel are brought to users.

The invention provides a ladle lidding device, and belongs to heat preservation technologies of a ladle. The ladle lidding device comprises an inner hood, an outer hood and a suspending hook; the internal shape of the inner hood coincides with the shape of a ladle opening, and the inner hood is used for covering the ladle opening; the internal shape of the outer hood coincides with the external shape of the inner hood, the edge of the outer hood is connected with that of the inner hood, and a sealed sandwich layer space is formed between the inner hood and the outer hood; the suspending hook is arranged on the outer hood and is used for suspending the ladle lidding device. The ladle lidding device has the advantages that through the principle that the air heat conducting coefficient is small, the ladle lidding device is manufactured, loss of molten iron heat energy is effectively lowered, the steel output temperature is increased, and the steel quality is improved; a desulfurization reaction is easily conducted, the consumption of active lime is reduced, and the cost is lowered; cracking caused by the stress of a refractory material is reduced, the service life of the refractory material is prolonged, and the service life of the ladle is prolonged.

The invention provides a tundish covering agent prepared by using blast furnace slag. The tundish covering agent prepared by using the blast furnace slag comprises the following raw materials, by 100 parts of weight, 30-45 parts of the blast furnace slag, 24.7-40 parts of limestone, 10-20 parts of vermiculite and 10 -20 parts of fluorite. Primary raw materials adopted by the tundish covering agent prepared by using the blast furnace slag are low in cost, appropriate in melting points, short in melting time, and excellent in spreadability and heat retaining property. The tundish covering agent prepared by using the blast furnace slag can prevent molten steel from being secondarily oxidized and temperature drop from being too much, meanwhile, the tundish covering agent prepared by using the blast furnace slag has certain absorption mixing performance, can purify the molten steel, and improves inner quality of casting blank; no carbon exists in the tundish covering agent prepared by using the blast furnace slag, alkalinity is appropriate, recarburization is not generated to the molten steel, alkalinity-resisting materials of a tundish is not corroded, and service life of the tundish is prolonged.