51results about How to "Improve self-opening rate" patented technology

The invention discloses a special steel ladle draining sand for stainless steel and a production process thereof. The product and the process can effectively improve the self-opening rate of a steel ladle, greatly relieve the labor intensity of workers, reduce oxygen-blast draining times, improve the quality of molten steel and ensure the progressive execution of a continuous casting process. When the stainless steel is produced by using the steel ladle draining sand, the self-opening rate of the steel ladle can reach above 98% so that the purposes of fewer oxygen-blast draining times, high quality of molten steel and progressive execution of the continuous casting process are achieved, and simultaneously, the total steel-making cost of a steel mill is also reduced.

The invention relates to a flow guiding agent used for a three-step refining and a preparation method thereof. The flow guiding agent mainly consists of the components with the following weight percentages: 23 to 35 percent of Cr2O3, 13 to 45 percent of SiO2 and 3 to 15 percent of Zr2O3. The forming of the granularity of the flow guiding agent is reasonable and the flowing capability is good; the refractory degree is not less than 1780 DEG C and agglomeration can be resisted; the capability of steel liquid penetration resisting is strong and the specific gravity is high; a proper thickness of an agglomeration layer can be formed and the self-opening rate of a steel bundle can be effectively enhanced; the component composing is reasonable and impurities brought into a casting-start process can be avoided. The invention is suitable for the manufacturing of high clean steels.

The invention discloses a ladle nozzle applied to the steel casting technology and particularly relates to a ladle nozzle capable of improving the automatic casting rate. A variable-diameter stuffing sand flowing channel is arranged at an upper water inlet. The upper water inlet is composed of an upper portion and a lower portion, and the inner diameter of the upper portion of the upper water inlet is larger than that of the lower portion of the upper water inlet. By means of the ladle nozzle, upper arch drainage sand piles are not produced, flowing of stuffing sand is facilitated, and the automatic casting rate is improved, the defect of manual oxygen burning casting in the prior art is overcome, the molten steel automatic casting rate is improved, the production rhythm is stabilized, effects of oxygen burning on the quality of molten steel are reduced, residual slag of steel ladles is reduced, and the like.

The invention discloses a silicon-carbon drainage agent and a preparation method thereof, and relates to the field of metallurgy. The drainage agent is composed of, by weight, 60-80 parts of quartz sand with the particle size being 0.3-0.6 mm, 1-10 parts of phosphorus slice graphite powder with the particle size being 325 meshes and the passing rate being 97%, 10-28 parts of silicon carbide with the particle size being 0.3-0.6 mm and 1-5 parts of binding agent. The preparation method of the silicon-carbon drainage agent comprises the following steps of dry mixing, wet mixing and drying. Various raw materials used for preparing the silicon-carbon drainage agent do not pollute the environment and molten steel, no impurity can be introduced in the molten steel smelting process, the purity of the molten steel of fine steel is ensured, and the requirements for using of market quality goods and cleaner production are met. The drainage agent prepared through the method is stable in performance, good in liquidity, low in heat conductivity coefficient, good in penetration resistance at high temperatures, and the free opening rate of steel ladles is increased. On the premise that the product performance is not lowered, low-price materials are used for replacing high-grade materials, and the cost is reduced.

The invention discloses a production process of stuffing sand. The method comprises the following steps of: (1) adopting recycled waste magnesite-chrome bricks, carrying out primary separation and iron removal, jaw crushing and rough addition into 8mm granules by using a roller machine to remove iron, and then processing into 3mm granules by using a crusher to remove iron, so as to obtain a semi-finished magnesite-chrome sand material; (2) sequentially adding the semi-finished magnesium-chromium sand, quartz sand and an additive into a planetary stirrer according to the technical proportioning requirement, and stirring for 5 minutes to obtain a finished product; and (3) matching and packaging according to the size of customer stuffing sand. The method has the beneficial effects that the waste magnesite-chrome bricks are used as raw materials, the effects of environmental protection and production cost reduction can be achieved, and in addition, the self-opening rate of the ladle filler sand prepared from the magnesite-chrome bricks through the process can be greatly improved.

The invention discloses a preparation method of refined chromite-based stuffing sand and belongs to the technical field of iron and steel smelting. The method comprises the steps that 60-65 wt% of chromium ore and 25-33 wt% of quartz sand are blended for 3-5 minutes in a mixing device, 4-7 wt% of potash feldspar is added and blended for 12-15 minutes, 2-3 wt% of low-grade silicon carbide is added and blended for 10-15 minutes, 1-2 wt% of carbon black is added and blended for 10-15 minutes, and then a chromite-based stuffing sand mixture is obtained; the mixture is placed into a rotary drying furnace for baking, the baking temperature ranges from 170 DEG C to 200 DEG C, the baking time ranges from 25 minutes to 30 minutes, the mixture is sieved, and then the chromite-based stuffing sand with the particle size ranging from 0.15 mm to 1.5 mm is obtained. The chromite-based stuffing sand has the advantages of being good in high-temperature sintering performance, good in erosion resistance to molten steel and molten slag, uniform in particle size distribution, good in fluidity, low in thermal expansivity and high in automatic casting ratio.

The invention relates to an alkaline flow guiding sand used in a steel ladle, which belongs to the metallurgy technical field, and comprises the chemical compositions as follows (by weight percentage): passive limes account for 30 to 50 percent, calcites account for 5 to 15 percent, corundum accounts for 5 to 10 percent, calcined olivine sands account for 20 to 40 percent, and flaky graphite accounts for 1 to 5 percent; and all components are confected according to the proportions and then are mixed to form the alkaline flow guiding sand. The prepared alkaline flow guiding sand used in the steel ladle has the characteristics of high refractability, strong erosion-resistence, high ladle free opening rate, low cost, no environmental pollution, no damage to pouring box metallurgy environment,and convenient use.

The invention relates to a forsterite ladle drainage sand and a preparation method thereof. The technical scheme adopted is: first mix 86-96wt% forsterite sand, 1-6wt% flake graphite, 1-8wt% potassium feldspar powder, and 0.5-2wt% carbonaceous micropowder, and then 5~15kg bags are packed in separate bags to prevent material segregation. Among them: MgO content of forsterite sand ≥ 41.0wt%, particle size 0.3 ~ 2.5mm, C content of flake graphite ≥ 95.0wt%, particle size 0 ~ 0.15mm, K2O content of potassium feldspar powder ≥ 10.0wt% , The particle size is 0-0.045mm, the C content of the carbonaceous micropowder is ≥85.0wt%, and the particle size is 0-0.020mm. The invention uses forsterite sand as the base material, and the prepared product has the characteristics of good high temperature resistance, high self-opening rate, low price, no adverse effect on human body, no segregation and convenient use.

The invention relates to a drainage sand, in particular to a quartz drainage sand for steelmaking and a preparation process thereof. The invention solves the defects of high price, miscellaneous composition and easy sintering and complicated manufacturing process of the existing drainage sand. The technical scheme of the present invention is: steelmaking drainage sand, in 100 parts, its weight ratio is: 90-95 parts of 10-50 mesh quartz sand, 1-2 parts of white mud, 1-3 parts of rice husk, 2 parts of graphite -3 parts, carbon black 1-2 parts. The preparation process is to fully dry mix each component for 3-5 minutes, fully mix each component with 8-10 parts of water in a mixer, and place the mixed drainage sand in an oven at 120°C-250°C to dry Baking for 2-3 hours is the finished steelmaking drainage sand. It is mainly used for plugging and drainage of the injection hole at the bottom of the ladle in steelmaking production.

The invention provides a special steel drainage agent and a preparation method thereof and belongs to the technical field of metallurgical fireproof materials. The special steel drainage agent is prepared by following raw materials of, by weight, 22-75 parts of natural zircon sand with granularity of 0.1-0.5mm, 8-40 parts of chrome ore with granularity of 0.1-0.5mm, 15-35 parts of desert sand withgranularity of 0.3-0.6mm and 1-3 parts of liquid graphite. According to the invention, the pouring rate of a product can be effectively improved; compared with the existing drainage agent, the automatic pouring rate can be improved by 10% or over and the basic automatic pouring rate can reach 100%; requirements are met that there are many types of special steel currently, the difference of components is big and long-time smelting is required; and the drainage agent and better drainage effects for steel types in war industry, nuclear power and special high-quality products are achieved.

The invention relates to a device for preventing molten steel from splashing during casting starting. The device comprises a large ladle water gap machine part (2), a large ladle water gap, a first large ladle water gap sliding plate (3), a second large ladle water gap sliding plate (6), a sliding operating rod (7), a large ladle water gap fixing device (12), a hydraulic shaft (11), a hydraulic cylinder (9), a hydraulic cylinder fixing device (8) and a large ladle long water gap (5), wherein the large ladle water gap machine part (2) is mounted at the bottom of a steel ladle (1); the large ladle water gap fixing device (12) is arranged at the external part of the large ladle water gap machine part (2) in a sleeving manner; part of large ladle water gaps in the large ladle water gap machinepart (2) is provided with an opening; the large ladle long water gap (5) is hung at the lower part of a large ladle lower water gap (4); the first large ladle water gap sliding plate (3) is fixed onone side of the opening; the second large ladle water gap sliding plate (6) is fixedly connected with one end of the sliding operating rod (7); the other end of the sliding operating rod (7) is connected with the hydraulic shaft (11) in a sleeving manner; and the hydraulic cylinder (9) is fixed at the bottom of the steel ladle (1) through the hydraulic cylinder fixing device (8).

The invention discloses a drainage sand, a preparation method and application thereof, and belongs to the technical field of steelmaking auxiliary materials. The raw materials include 5-20 parts of zircon sand, 45-75 parts of chrome sand, 10-30 parts of quartz sand, 0.4-1 part of carbonaceous lubricant and ≤4 parts of sintering agent. ZrO in zircon sand 2 The content ≥ 62wt%, at least 80wt% of the particle size is 0.2-1mm. Cr in chrome sand 2 o 3 The content ≥ 46wt%, at least 85wt% of the particle size is 0.25-0.9mm. SiO in quartz sand 2 The content ≥ 96wt%, at least 85wt% of the particle size is 0.4-0.85mm. The drainage sand has uniform and stable composition, dense filling, good fluidity, uniform and moderate sintered layer, good pouring effect, and automatic pouring rate ≥ 99.5%. The preparation method comprises roasting the raw material mixed with water, the method is simple, easy to operate and suitable for industrial production. It is suitable for the preparation of high-quality steel grades.

The invention discloses a carbon-free steel ladle drainage agent for extremely-low carbon steel. The carbon-free steel ladle drainage agent for the extremely-low carbon steel comprises the following active ingredients in percentage by mass: 20 to 36 percent of Cr2O3, 10 to 40 percent of SiO2, 10 to 25 percent of Fe2O3, 5 to 18 percent of Al2O3 and 10 to 20 percent of MgO. The carbon-free steel ladle drainage agent for the extremely-low carbon steel comprises the following active ingredients of 31.28 percent of Cr2O3, 23.52 percent of SiO2, 14.71 percent of MgO, 19.09 percent of Fe2O3 and 9.86percent of Al2O3. The carbon-free steel ladle drainage agent for the extremely-low carbon steel is prepared from the following raw materials in percentage by mass: 50 to 80 percent of chromite sand, 10 to 30 percent of white quartz and 8 to 20 percent of electro-fused magnesia.