10results about How to "Prevent slagging" patented technology

This utility model discloses an electroslag remelting furnace for mold steel, relating to the field of metallurgical technology. It includes a base, a coil, and a lifting mechanism. A multi-stage crystallizer is fixedly installed on the base. The multi-stage crystallizer consists of multiple individual crystallizers, each with its own cooling chamber. A mounting base is fixedly installed at the upper end of the multi-stage crystallizer, and a sealing mechanism is fixedly installed at the upper end of the mounting base. The beneficial effect lies in the fact that the weight of the electrodes is detected by a pressure sensor. Based on the change in electrode weight, the magnitude of the magnetic field generated by the coil is adjusted, thereby improving the flow of the molten pool within the multi-stage crystallizer, reducing segregation, and preventing excessive turbulence that could lead to slag entrapment. Furthermore, the independent crystallizers and individual cooling chambers allow for different melting processes of the electroslag in different areas, avoiding uneven cooling or temperature imbalance during the melting process and effectively improving the crystallization quality of the product.

This invention relates to a protective slag for sulfur-containing free-cutting steel crystallizers using photovoltaic silicon mud and its preparation method. The protective slag of this invention contains, by mass percentage, 30.6–31.6 wt% CaO, 36.7–37.7 wt% SiO2, 6.1–7.1 wt% Al2O3, 8.2–9.2 wt% Na2O, 5.0–6.0 wt% F, and 9.0–10.0 wt% C. 固 H2O up to 0.5 wt%; C 固 The carbon in the protective slag is fixed. Raw materials include 7-9 wt% silica mud, 14-16 wt% blast furnace slag, 24-26 wt% phosphorus slag, 14-16 wt% silicate cement, 4-6 wt% wollastonite, 10-12 wt% soda ash, 2-4 wt% fluorite, 6-8 wt% cryolite, and 10-12 wt% carbon powder. The preparation method includes batching, slurry preparation (solid content 40-45%), spray granulation (spray gun orifice diameter 1.0-1.5 mm, inlet temperature 450-480℃), and post-treatment. This invention enables the utilization of photovoltaic silica mud, reducing the cost of protective slag containing silica mud by 870 yuan per ton, and increasing the flaw detection pass rate of continuously cast billets from 25.99% to 55.17%, thus possessing both energy-saving and emission-reduction value and a circular economy value.

The invention provides a continuous casting process method for controlling inclusions in steel and a tundish. The method comprises the following steps that the position of a tundish retaining wall is moved to a molten steel outflow area; in the continuous casting production process, a covering agent is added in a molten steel inflow area; tundish deslagging is conducted 5-8 minutes before pouring of the large ladle is completed; carrying out slag picking on the crystallizer once 3-6 minutes before changing the water gap every time; and after the water gap is replaced every time and the liquid level of the crystallizer is stable, slag picking of the crystallizer is carried out again. After the technical method is implemented, the inclusion defect rate after continuous casting billet rolling is reduced to 0.12% from 0.46% of a conventional method, and the effect is remarkable.

The invention belongs to the technical field of gypsum board production, and particularly relates to a gypsum board length switching automatic adjusting device which comprises a main body mechanism and a gypsum board placed on the main body mechanism and further comprises cases arranged on the two sides of the main body mechanism. By arranging the adjusting component and judging the included angle between the adjusting rod and the horizontal ground and the length of the adjusting rod at the moment, the distance between every two adjacent stopping mechanisms can be measured and calculated, so that the gypsum board fixing device adapts to gypsum boards of various specifications, the downward moving distances of the telescopic columns are equal, and the gypsum board fixing device is suitable for gypsum boards of various specifications. When the adjusting rod on the base faces downwards, the stopping mechanism at one end is pushed outwards, and meanwhile the other set of adjusting components connected with the stopping mechanism are driven to be pushed outwards, so that the movable base and the movable rod need to freely slide to replace positions, adjustment of data parameters is facilitated, and the gears of the telescopic columns are the same; one-key opening only needs the adjusting rod on the base to provide initial force, the distance of the multiple sets of stop mechanisms can be adjusted in an accelerated mode, and one-by-one adjustment is avoided.

The invention discloses a method for refining low-carbon low-sulfur steel through vacuum carbon deoxidation, and relates to the technical field of molten steel external refining. The process method comprises the following steps: carrying out pre-deoxidation by adopting a carbon source alloy material without using a metal deoxidation material; vacuum carbon deoxidation treatment is carried out under the condition that the vacuum degree is smaller than or equal to 100 Pa; the flow of the stirring gas is controlled to be 0.2-1.0 NL / (t.min); controlling the vacuum holding time to be not more than 5 minutes and the vacuum period to be not more than 15 minutes; the method comprises the following steps: controlling the tapping temperature of a primary smelting furnace to be 1620-1680 DEG C; in the LF station refining process, the binary alkalinity of refining slag is controlled to be 5.0-8.0, and diffusion deoxidation and white slag making are conducted in cooperation with a metal deoxidizing agent; the low-carbon and low-sulfur steel is produced through organic combination of vacuum carbon deoxidation and LF refining on the premise that a metal deoxidation material is not used for pre-deoxidation, the total oxygen content in the steel can be controlled to be 15 ppm or below, and the sulfur content can be controlled to be 0.005% or below.

The invention discloses a hot galvanizing sink roll device for preventing the surface of a sink roll from slagging, which comprises a sink roll body and support arms respectively connected with two end parts in the axial direction of the sink roll body, and further comprises heating elements arranged at one ends, far away from the sink roll body, of the support arms. The hot-dip galvanizing sink roll device for preventing the surface of the sink roll from slagging can prevent the surface of the sink roll from slagging, reduce defects caused by zinc dross and obtain better hot-dip galvanizing surface quality.

The invention discloses a preparation device for a PU material foaming piece of vehicle-mounted refrigerator heat preservation cotton, and belongs to the technical field of vehicle-mounted refrigerator heat preservation cotton preparation. The preparation device comprises a supporting table, and a mixing mechanism and a mold closing mechanism are arranged on the upper surface of the supporting table; according to the device, the mixing mechanism is arranged, a fixing sleeve can be driven to synchronously rotate along with rotation of a spiral column, at the moment, the fixing sleeve drives a rotating rod to do circular motion, the rotating rod can drive a transmission gear to move in an inner gear ring, and the transmission gear drives the rotating rod to rotate under the action of the inner gear ring; at the moment, the rotating rod drives the stirring rod to perform circular motion and autorotation in the mixing barrel, so that polyether polyol and isocyanate in the mixing barrel are stirred and mixed, the defects of air holes and hollowing in a foaming piece are effectively avoided, the fluidity of raw materials is improved, impurities and water are removed, sufficient foaming reaction is ensured, and meanwhile, the density uniformity of the foaming piece is also ensured; and the heat preservation performance of the heat preservation cotton for the vehicle-mounted refrigerator is greatly improved.

The invention provides a vortex suppression device and method for molten steel in a barrel. Molten steel is injected into the steel drum, the molten steel and the scum are layered in the height direction, and the molten steel can be discharged from the steel outlet; the vortex suppression device for the molten steel in the barrel comprises a floating body, the floating body is provided with a floating body bottom face and a floating body top face which are opposite in the height direction, the floating body is arranged above a steel outlet in the steel barrel and floats between the molten steel and the scum, and the floating body top face is exposed above the scum. The top surface of the floating body is provided with a surface of which the geometric normal vector change is changed into the geometric shape change, so that the heat transfer area of the top surface of the floating body exposed above the scum is increased, the heat dissipation speed is increased, the scum is condensed on the bottom surface of the floating body and the periphery of the floating body more quickly, the area of the floating body in the horizontal direction is increased, and the friction force of the floating body to molten steel is also increased; and the effect of inhibiting vortex generation is improved.

This utility model relates to the field of refractory materials technology for metallurgical equipment, and in particular to a ladle tank bottom lining structure with a gradient thickness, including ladle nozzle seat bricks, vertically laid tank bottom bricks, and lining wall bricks. The vertically laid tank bottom bricks include center bricks, intermediate bricks, and edge bricks, which are laid in a ring from the ladle nozzle seat bricks towards the edge of the ladle tank bottom, with the thickness d of the center bricks, intermediate bricks, and edge bricks increasing by 30mm to 40mm respectively. The lining wall bricks are set at the bottom of the inner wall of the ladle tank and connect with the edge bricks, with the thickness e of the lining wall bricks decreasing by 15mm to 20mm from bottom to top. The beneficial effects of this utility model are: by optimizing the thickness distribution, it improves thermal shock resistance, structural stability, and service life, and increases the steel loading capacity.

The present application relates to the metallurgical technology field, especially relate to a kind of off-oven refining combined vacuum arc remelting preparation ultra-pure stainless steel method.The preparation method of the present application is by AOD station to transfer the crude molten steel obtained by EAF smelting to AOD refining furnace to blow oxygen refining, pre-reduction refining slag is CaO-CaF2-SiO2-MgO slag system;After pre-reduction treatment, reduction treatment is carried out, and the reduction refining slag is CaO-CaF2-SiO2-MgO slag system;The molten steel after reduction treatment is transferred to VD furnace for vacuum treatment, and the treated molten steel is transferred to ladle, then poured into mold, and ingot is obtained;After ingot is forged into electrode, ultra-pure stainless steel is prepared by VAR, with ultra-high cleanliness, coarse system inclusions is 0 level, fine system A+B+C+D inclusions≤0.5 level, effectively realize the accurate low control of aluminum content in steel, and simultaneously reduce the oxygen content and non-metallic inclusion content in steel, finally prepare high-quality ultra-pure stainless steel.