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

The compound purificant of external refining of molten steel and production method pertains to the field of smelting ferroalloy, in particular to the purificant dislodging impurity of molten steel and the purificant production method in external refining. The purificant comprises graphite, ferrosilicon, calcium-silicon and bauxite, according to the percentage of weight, is composed of the following components: the carbon content is from 18 per cent to 32 percent, the content of silicon is from 15 percent to 26 percent, the content of iron is from 3 percent to 8 percent, the content of calcium is from 3 percent to 10 percent, the content of aluminum oxide is from 26 percent to 38 percent, the content of water is less than or equal to 0.75 percent, and the remainder is the impurity and adhesion agent. The method producing the compound purificant of molten steel includes these steps of matching material, crashing, mixing, grain-making, drying, checking, piling and bagging, the purificant becomes graininess, and the grain size ranges from 3 mm to 30 mm. The method has the advantages of the extensive material, the convenient machining, the safety and reliability in production, storage and use, the strong capability of purifying molten steel, the low oxygen content of molten steel, promoting slag foaming, favorable submerged-arc operating in fining furnace, improving the thermal efficiency and the ladle age, the excellent effect of desulfurize, improving the recycle rate of manganese and silicon, saving the use of alloy.

The invention discloses a stainless steel smelting method for improving the content of MgO in slag of a gas oxygen refining converter and an LF (ladle furnace). The method comprises the following steps: a, preparing a magnesium-calcium refractory material with particle size of 3-15mm and a magnesium-calcium refractory material with the particle size less than 3mm; b, adding the magnesium-calcium refractory material with the particle size of 3-15mm into the gas oxygen refining converter to serve as a bottom magnesium-calcium refractory material; adding the magnesium-calcium refractory material with the particle size of 3-15mm once more during the converting period I, so as to keep the content of MgO in the slag within 9-11%; c, during the smelting and slagging process of the refining LF, adding lime, a slagging agent and the magnesium-calcium refractory material with the particle size less than 3mm together, so as to control the content of MgO in the slag within 7-9%; and d, proceeding to the continuous casting procedure. The method disclosed by the invention can improve the content of MgO in the slag, at the same time, improves the content of CaO, reduces erosion to the furnace lining, and prolongs the furnace life of the converter as well as the ladle life of the LF. The method disclosed by the invention has low requirements on a crushing appliance, lowers the production cost, and has higher economic and social benefits.

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 provides a ladle covering agent prepared through utilizing blast furnace slag. The ladle covering agent is composed of 30-40 parts by weight of blast furnace slag, 26.7-40 parts by weight of limestone, 15-20 parts by weight of vermiculite and 5-15 parts by weight of fluorite, wherein the total weight part of the above raw materials is 100. The main raw materials of the ladle covering agent have the advantages of low cost, suitable melting point, short fusing time and good spreadability; and limestone decomposes at 800-1200DEG C, foams and expands, vermiculite expands at a high temperature, and the friction force among solid particles is lower than the inner friction force among powders, so the spreadability and the heat insulating property are good. The ladle covering agent can prevent the secondary oxidation and too large temperature decrease of molten steel, and has a certain impurity adsorption and inclusion capability to purify the molten steel because of the appropriate alkalinity. The ladle covering agent has no carbon, does not carburize the molten steel, and is in favor of the component control of the production process.

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.

A light-weight alkaline particle used as the covering agent of steel ladle contains siO2 (18-26 Wt%), CaO (26-34), MgO (6-12), Al2O3 (5-8), Fe2O3 (0.5-2.0), and stabilized C (18-26). Its advantages are low specific bulk weight, high insulating performance, and high effect to prevent oxidization of molten steel and decrease the corrosion to refractory of ladle.

The invention relates to a device for measuring the inner dimension of a steel ladle by using a laser distance measuring instrument and an operation method thereof, comprising a laser distance measuring mechanism and a beamline mechanism, and a lateral barrier frame is arranged at the bottom of the laser distance measuring mechanism. The beneficial effects of the present invention are: the device and its operating method for measuring the internal dimensions of the steel ladle by using a laser rangefinder can measure the size of any area inside the steel ladle through the method of the invention, and compare it with the relevant parameters when the ladle goes online to determine the The degree of regional melting loss can be measured by this method to easily simulate the internal situation of the ladle, measure and calculate the degree of melting loss of the refractory material of the ladle and the steel quantity of the ladle. Monitor and provide ladle lining size control data and information to lay the foundation for saving refractory consumption and increasing ladle life, and effectively prevent major accidents of ladle through furnace, and escort the safe operation of ladle ladle service and smooth production.

The invention discloses a case repairing method of steel brick laying working lining, which comprises the following steps: 1) cleaning residual steel and slag on the lining, 2) assembling fetal mould, 3) casting material between fetal mould and bricking lining, tamping, 4) drying naturally for 24-30h, stripping, 5) toasting at little flare for 24h and middle flare for 16h and large flare for 8h.

The invention provides a technical scheme of a slag removing device for a ladle. The slag removing device comprises a pressing mechanism for tightly pressing a ladle body and a slag hooking mechanism for removing bonded slag in the ladle, wherein the pressing mechanism comprises rotatable supports, each rotatable support is formed by fixed connection of at least two sections of support arms, the support arms located at two ends of each rotatable support are hinged to and connected with a cylinder rod and a cylinder body of each rotatable oil cylinder respectively, and the support arm at one end of each rotatable support tightly presses a trunnion seat of the ladle during working; the slag hooking mechanism comprises a movable support driven by a movable support driving mechanism to move, and hooks for hooking and removing the bonded slag in the ladle are fixed at the lower part of the movable support. According to the slag removing device, the pressing mechanism presses and fixes the ladle in a cleaning pit, and meanwhile, movable oil cylinders are started to drive the hooks, so that the bonded slag in the ladle is removed.

The invention belongs to the field of metallurgy, and relates to a cast steel riser covering agent and its preparation and use method. The cast steel riser covering agent includes 15 to 40 parts of aluminum electrolysis waste cathode carbon blocks in 100 parts by mass, 10-35 parts of dolomite, 10-25 parts of vermiculite, 20-40 parts of waste silicon carbide-silicon nitride bricks for aluminum electrolysis; during preparation, the dried raw materials are first crushed and ground, and the particle size is not greater than 2mm; Then weigh each raw material according to the composition quality of the raw materials, then stir evenly, and dry to obtain the casting steel riser covering agent. When in use, the cast steel riser covering agent is added to the ladle to form a slag layer, and finally the thickness of the slag layer is 6-8 cm, the liquid surface of the ladle does not leak red, and the slag layer does not crust. By using the casting steel riser covering agent of the present invention, the heat loss at the top of the riser can be solved, and the solidification speed of the molten steel in the riser can be extended, thereby improving the feeding capacity of the molten steel in the riser, ensuring the process yield of castings, and reducing the risk of leakage. The height of the mouth can save molten steel and ultimately reduce the cost.