53results about How to "Fast slag removal" patented technology

The invention discloses a fire-resisting material used for aluminum alloy fusion casting, and a fire-resisting apparatus made of the fire-resisting material and a method for preparing the fire-resisting apparatus, wherein the fire-resisting material comprises aluminum silicate fiber powder, talcum powder, mullite powder, zirconite powder and a silica sol solution. The fire-resisting material has the advantages of no aluminum adhesion and no chemical reaction with an aluminum liquid, no addition of asbestos, rapid deslagging and no damage after using a prefabricated molding assembling part, better thermal-shock resistance, durability, controllable concentration, intensity and thermal-shock resistance, and small shrinkage mass of a cooling process after use to effectively prevent the assembling joint of the prefabricated molding part from cracking. The corresponding fire-resisting apparatus has the advantages of heat shock resistance, washing resistance, corrosion resistance, and small heat expansion coefficient.

The metal core welding wire for submerged arc welding of A304 and A304L austenitic stainless steel belongs to the field of welding material widely used in petroleum, chemical, ship-building and other fields. The present invention features that the metal core welding wire is formed through adding metal mixture powder in 40-58 wt% into low carbon steel belt material or super low carbon steel belt material, and the metal mixture powder consists of Cr 37-57 wt%, Ni 17-28 wt%, Mn 3-9 wt%, reduced Fe 7.5-30 wt%, Bi2O3 0.5-1.5 wt%, and Al-Mg alloy 2-10 wt%. The corresponding welding specification includes welding current of 380-600 A, welding voltage of 30-40 V and welding speed of 450-800 mm/min. The metal core welding wire has simple production process and excellent post-welding slag removing performance, and is especially suitable for high speed automatic welding.

The invention relates to a special slag system for producing 17-4PH steel ingots. The special slag system is prepared from the following components in percentages by weight: 26-28% of Al2O3, 25-27% of CaO, 4-5% of SiO2, 5-6% of MgO and the balance of CaF2. The binary basicity CaO/SiO2 of the system is 5-6.75. The melting hemispherical temperature of the special slag system is 1220-1250 DEG C; 0.402-0.434 ohm/cm. The viscosity at 1500 DEG C is 0.0352-0.0359 Pa/s. The slag system provided by the invention is relatively low in melting point, relatively high in resistivity, relatively small in viscosity changing with temperature, relatively good in high-temperature plasticity, relatively high in basicity, low in content of fluorides and high in slugging speed, can meet the demand on production of 17-4PH steel ingots by means of an ingot pulling electroslag remelting process, can guarantee the internal quality and surface quality of the 17-4PH steel ingots, and has the advantages of being energy-saving and environment-friendly.

The invention provides a smelting furnace slagging-off device. The smelting furnace slagging-off device comprises a smelting furnace main body, a furnace hearth, a heating mechanism, an electric cylinder I, a fixed block, a feeding box, a connection frame, an electric cylinder II, an movable block, a hollow cylinder and a slagging-off plate, wherein the furnace hearth is arranged in the smelting furnace main body; the heating mechanism is mounted at the lower end of the furnace hearth; the electric cylinder I is mounted at the upper end of the smelting furnace main body; the fixed block is arranged at the upper end of the electric cylinder I; the feeding box is mounted at the upper end of the fixed block; the connection frame is fixed at the right end of the fixed block; the electric cylinder II is mounted on the inner left end surface of the connection frame; the movable block is arranged on the right end surface of the electric cylinder II; the hollow cylinder is fixed at the lower end of the movable block; the slagging-off plate is mounted on the hollow cylinder. Through the design, the function of applying a slag conglomeration agent is achieved, and the slagging-off speed is rapid; the smelting furnace slagging-off device is convenient to use and convenient to operate, can achieve the function of applying the slag conglomeration agent, and is rapid in slagging-off speed and high in reliability.

The invention provides a slag scraper for a steel ladle opening. The slag scraper comprises a plurality of scraping knives. The scraping knives comprise the fixed ladle opening outer wall scraping knives and the ladle opening edge scraping knives. The multiple fixed ladle opening outer wall scraping knives and the multiple ladle opening edge scraping knives are concentrically distributed in a spoke shape in a scattering manner, and the multiple ladle opening outer wall scraping knives are distributed outside a spoke-shaped outer circumference face formed by the multiple ladle opening edge scraping knives. During work, the steel ladle opening is located in a spoke-shaped ring formed by the multiple ladle opening outer wall scraping knives. The inner diameter of the spoke-shaped ring formed by the multiple ladle opening outer wall scraping knives, the outer diameter of the spoke-shaped outer circumference face formed by the multiple ladle opening edge scraping knives and the outer diameter of the steel ladle opening are consistent. The slag scraper for the steel ladle opening is large in single-time slag removal quantity, a steel ladle operates safely, and the slag scraper is not prone to being damaged; and the slag scraper carries out slag removal treatment on the edge and the outer wall of the steel ladle opening with severe slag accumulation at the same time, the slag removal speed is high, and the efficiency is high.

The invention relates to a method for removing slag from molten steel, which controls the upper clearance of the molten steel tank to be greater than 300 mm when tapping the converter. When the molten steel tank is tilted to the angle of slag removal, first remove the solidified slag shell; then add lime particles into the molten steel tank according to the ratio of lime and slag of 1:3 to 6 and spread evenly; after the lime and steel slag fully react , Scrape out the residual steel slag in the molten steel tank. Due to the chemical reaction between the lime and the high-temperature molten steel, the steel slag is foamed and the volume of the steel slag is increased, and the steel slag can be discharged from the molten steel tank when it is overturned. And in the process of lime melting and reaction, the temperature of the surface layer of steel slag will decrease, which will increase the viscosity of steel slag and make the steel slag easy to remove, thereby reducing the pollution of molten steel by strong oxidizing steel slag on the surface of molten steel, improving the purity of molten steel, and reducing the amount of deoxidizer. consumption and cost expenditure, reduce the workload of deoxidation treatment, increase the speed of slag removal, and reduce labor intensity.

The invention relates to calcium aluminate for desulfurization of ultralow titanium and carbon steel and a preparation method thereof. The calcium aluminate comprises more than or equal to 94% of Ca12Al14O33, less than or equal to 2% of Ca3Al2O6, less than or equal to 2% of Ca2SiO4, less than or equal to 1.5% of MgO, less than or equal to 0.01% of pure Ti and less than or equal to 0.02% of pure carbon. The preparation method comprises the following steps of: (1) preparing materials according to the following proportions: 60-65% of CaO and 35-40% of Al; (2) mixing the proportioned raw material particles in a material mixer; (3) adding the mixed materials into a smelting furnace, and blowing fuel to heat the furnace to make furnace temperature achieve 950-1050 DEG C; (4) blowing oxygen into the furnace, heating the furnace body to 1450-1500 DEG C; and (5) cooling and crushing premelted slag into 5-30 mm blocks. The desulfurizing agent provided by the invention has the advantages of low production cost, easy for storage, low melting point, high slag melting speed, high desulfurization effect and small corrosion to refractory materials, and the carbon increase amount and the titanium increase amount of liquid steel can be effectively controlled.

The invention discloses a dephosphorization converter bottom maintaining method. The dephosphorization converter bottom maintaining method comprises the steps that liquid decarbonized slag is added into a dephosphorization converter subjected to steel tapping, wherein the decarbonized slag is decarbonized semisteel slag obtained after semisteel is smelted in a decarbonization furnace, and the melting point of the decarbonized slag is 1450-1500 DEG C; cooled agglomerated pellets are added into the dephosphorization converter, so that the liquid decarbonized slag in the dephosphorization converter is cooled and densified; and the dephosphorization converter is subjected to slag splashing operation, and after the decarbonized slag is completely solidified, converter bottom maintaining is finished. The decarbonized slag is high in melting point, can be quickly solidified after slag splashing and achieves an effect of protecting a lining and the bottom of the converter; meanwhile, the decarbonized slag has the characteristics of being high in alkalinity and ferric oxide content and capable of reducing the consumption amount of lime of the dephosphorization converter and providing the initial high-ferric-oxide condition for the dephosphorization converter, so that the slagging speed in the initial stage of smelting is increased, and the purpose of smelting ultralow-phosphorus steel with the low cost is achieved.

The invention discloses a high-finish-degree antibacterial stainless steel pump valve casting. According to the stainless steel pump valve casting, the use amount of elements such as Cu, Zr and Ag is properly increased on the basis that low-carbon steel has good toughness and plasticity, good casting mold forming performance is given to a stainless steel casting material, the hardness and toughness are achieved, corrosion resistance is extremely excellent, the certain antibacterial property is achieved, the situation that the surface of the material breeds bacteria and consequently use is affected can be prevented, crystal nucleuses can be refined effectively through the added rare earth element, the surface quality of the casting is improved, shrinkage cavities are reduced, and a high-finish-degree material is obtained; and the deoxygenation and impurity removal effects are achieved through a composite refining agent of nanometer Ca-RE intermediate phase alloy powder loaded by honeycomb ceramic powder and graphene, the slagging speed is high, efficiency is high, the degree of purity of molten steel can be increased effectively, the performance of stainless steel heat-treated multiple times is stable, and the energy-saving and efficient production effects of products are achieved.

The invention belongs to the technical field of ferrous metallurgy. A novel slag collection device comprises a portal frame and a slag collection mechanism arranged on the portal frame. The slag collection mechanism comprises a hanging bracket. A slag claw is connected with a lower portion of the hanging bracket, a hydraulic drive device driving the slag claw is arranged on the hanging bracket. The novel slag collection device is used for working on slag collection of ladles, and a structure of the novel slag collection device is simple. The slag can be quickly taken out and the efficiency ofthe slag collection is effectively improved.

The invention relates to a molten iron desulphurization pretreatment process and method, belongs to the technical field of molten iron desulphurization processes, and solves the problems of poor desulphurization effect, large slag salvaging iron loss and the like of a molten iron desulphurization process. The method comprises the following steps: S1, temperature measurement and sampling are conducted, specifically, temperature measurement and sampling are conducted on molten iron; S2, the injection amount is determined, and the total demand quantity of a desulfurizing agent is determined according to the content of initial sulfur and the type requirement of the steel type; S3, the desulfurizing agent is pre-added, specifically, the desulfurizing agent with the basic demand quantity is pre-added to the bottom of a molten iron ladle; S4, molten iron pouring and desulfurizing agent injection are conducted, specifically, the molten iron in a torpedo ladle is poured into the molten iron ladle, and meanwhile a spraying gun is used for being aligned with falling molten iron flow to spray out the desulfurizing agent; and S5, slag salvaging is conducted, specifically, desulfurization slag floating on the surface of the molten iron is salvaged away from the molten iron ladle through a special slag salvaging machine. According to the method, the desulfurizing agent is released in two directions to react with the molten iron, desulfurization is carried out in a mode of pouring the molten iron while injecting, desulfurization is carried out in cooperation with existing equipment, special slag salvaging equipment is manufactured for salvaging slag, and therefore the purposes of efficient and rapid desulfurization and slag salvaging are achieved.

The invention relates to an anti-slag-blocking slag discharging opening structure for an entrained-flow bed gasification furnace and an arrangement method thereof, belongs to the field of slag discharge of gasification furnaces, and aims to solve the problems that the slag discharging opening in the existing entrained-flow bed gasification furnace is often blocked in the slag discharge process, and once the slag is blocked, the slag can only be removed by blowing out the gasification furnace, thus the whole production line is completely stopped, and huge economic loss is caused to the enterprise. According to the anti-slag-blocking slag discharging opening structure for the entrained-flow bed gasification furnace and the arrangement method thereof, the slag discharging opening structure adopts a structural form of 'narrow inlet and wide outlet', and the position of the inlet end of the slag discharging opening is higher than the position of the inlet of a traditional slag discharging opening, the temperature of the liquid slag entering the slag discharging opening is higher, and is 80-100 DEG C higher than the temperature of the slag discharging opening in the initial slag falling position in the traditional form. Ash slag can be discharged in a liquid state through the high slag melting temperature, solid slag cannot be formed, and slag blockage of the slag discharging opening can be prevented.

The invention provides a slag removing device used for a molten steel vacuum treatment insert tube (14), wherein the slag removing device comprises a car body (4), two pairs of shovel blades (71,72,73, and 74) and a drive device. A pair of shovel blades (71 and 72) is oppositely arranged along the lateral direction (A) of the car body, and the other pair of shovel blades (73 and74) is oppositely arranged along the longitudinal direction (B) of the car body, so that the two pairs of shovel blades can form a slag removing space (20) suitable for the molten steel vacuum treatment insert tube to insert; the driving device drives the shovel blades to vibrate up and down along the height direction (C) of the car body. The invention also provides a method for removing slags by the slag removing device. Even the steel slags with high cohesional strength can be easily removed by using the slag removing device and method; moreover, since the slag removing speed is high, the working efficiency ofa vacuum treatment device can be increased; in addition, as the motion path of the shovel blades of the slag removing device is relatively stable, the vacuum treatment insert tube can not be damaged.