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

The invention relates to passivated drainage sand with a coating for ladle refining and a preparation method thereof. The drainage sand comprises an aggregate composed of chromite sand and silica sand; the surface of the aggregate is coated with an impregnating compound; refractory powder is adhered to the surface of the impregnating compound, and passivation solution is coated outside the refractory powder. The preparation method comprises the following steps: uniformly agitating the aggregate prepared by mixing the chromite sand with the silica sand; then spraying the impregnating compound into the aggregate by adopting an atomizer, uniformly agitating, adding a refractory material and uniformly agitating; and finally spraying the passivation solution by adopting the atomizer and uniformly agitating. Through the drainage sand, the aggregate can be ensured to be better bonded with the refractory powder under the action of the impregnating compound, and the segregation of the refractory material can not occur during the use, so that an excessively-thick sintering layer is prevented from being formed due to long refining time; and the preparation method is simple, and the industrialization is easily realized.

The invention provides a chrome stuffing sand for refining ladles, and a production method thereof. The problems of low automatic casting rate, high production cost and large environmental impact of stuffing sands are solved. The chrome stuffing sand for refining ladles comprises, by mass, 1-20% of chrome ores, 40-60% of calcium alumino-titanate electromelted balls, 30-40% of fractured quartz sands and 0.6-1% of a carbon additive, and the carbon additive is a carbon black and graphite mixture. The introduced calcium alumino-titanate which is industrial steelmaking waste slag is applied to thestuffing sand, so the waste slag is effectively recycled, and the manufacturing cost is greatly reduced. The calcium alumino-titanate electromelted balls are adopted to partially substitute the chromeores, so the pollution is reduced, molten steel is cleaned, and the problems of dependence on importance and high cost of raw materials are solved.

The invention discloses a preparation method of siliceous stuffing sand, belonging to the field of stuffing sand. The preparation method comprises the following steps: step I, weighing the following components in percentage by mass: 75-95% of quartz sand, 1-5% of potassium feldspar and 1-8% of graphite micro powder, adding the components into stirring equipment in sequence to stir for 15-20 minutes at a high speed, and then adding 3-12% of a regulator to stir for 8-12 minutes at a high speed, and adding water which accounts for 8-10% of the total weight of the components to stir and mix uniformly at a high speed to obtain a mixture A; and step II, putting the mixture A in the step I in a rotary drying oven to roast for 1.5-2 hours at a roasting temperature of 170-200 DEG C to obtain the siliceous stuffing sand. The preparation method of the siliceous stuffing sand is simple, reasonable in component selection, easily available in raw material, good in high-temperature sintering performance, uniform in particle granularity distribution, good in mobility, relatively small in coefficient of thermal expansion and high in self-opening rate.

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 discloses ladle filler sand for continuous-casting high aluminum steel. The sand is formed by evenly mixing, by weight, 29-37% of quartz sand used as skeleton materials, 52-60% of chromium ore used as base materials, 9-12% of carbon powder used as addition agents, and 0.5-2% of phenolic resin used as binding agents. The invention further discloses a use method of the ladle filler sand for the continuous-casting high aluminum steel. The method comprises the steps of firstly conducting roasting pretreatment on the ladle filler sand, then adding the ladle filler sand into a water opening, and enabling the ladle filler sand to exceed5-15mm relative to the plane of a well block of the water opening. By the adoption of the ladle filler sand and the use method, the steel ladle self-opening rate is effectively improved, efficiency is improved, operation is convenient, labor intensity is reduced, the sand is free of pollution and meets the process requirement, in the sand discharging process, the ladle filler sand can smoothly flow out along with molten steel, and slag inclusion in a steel ingot is reduced.

The invention discloses preparation, packaging and layered adding methods of ladle filler sand. The ladle filler sand is prepared from the following components in percent by weight: 30-50% of chromiumladle filler sand and 50-70% of compound ladle filler sand. The compound ladle filler sand is magnesium ladle filler sand or silicon ladle filler sand. The chromium ladle filler sand is prepared fromthe following components in percent by weight: 65-80% of first chromium ore, 12-16% of first quartz sand, 4-6% of first magnesite, 6-8% of first aluminum oxide spheres, 3-5% of first potassium feldspar and 1-3% of a first carbon proportioning agent. Cr2O3 content of the first chromium ore is greater than or equal to 46-51wt%, and the granularity is 0.15-2 mm; SiO2 content of the first quartz sandis greater than or equal to 98.0wt%; MgO content in the first magnesite is greater than or equal to 98.0wt%; Al2O3 content of the first aluminum oxide spheres is greater than or equal to 75.0wt%; K2Ocontent of the first potassium feldspar is greater than 8wt%; C contents of first graphite and first carbon black are greater than 92wt%. The ladle filler sand is added quantitatively in layers, so that the self-opening rate of a steel ladle is improved and the production cost of the ladle filler sand is lowered. The ladle filler sand made from different materials is added uniformly in layers andat a fixed speed under constraint of a packaging barrel.

The invention discloses drainage agent special for an alloy bushing. The drainage agent consists of the following ingredients in parts by weight: 15-17% of Gr2O3, 12-25% of SiO2, 8-15% of MgO, 6-15% of Al2O3 and 2-8% of Fe2O3. Compared with the prior art, the drainage agent is characterized in that deficiencies in the prior art are overcome, a proportion and a production technology are reasonably set to provide the drainage agent special for the alloy bushing. The drainage agent special for the alloy bushing has the advantages of low cost, stable coefficient of expansion of silica quartz sand at a high temperature, good high-temperature sintering performance, good molten steel and molten slag corrodibility resistance, even particle granularity distribution, good mobility, small thermal expansivity and high free-opening rate.

The invention discloses zirconium-silicon-chromium-based ladle stuffing sand and a preparation method thereof. The preparation method comprises the following steps: mixing raw materials consisting of zircon sand, quartz sand, chromite sand and carbon black according to a certain weight ratio, and carrying out mechanical stirring, spray granulation, screening and cooling treatment to obtain target ladle stuffing sand powder. The obtained stuffing sand contains 24%-40% of ZrO2, 27%-37% of SiO2, 10%-20% of Cr2O3, 1%-8% of Al2O3, 4%-16% of Fe2O3 and less than 0.5% of H2O; the refractoriness of the stuffing sand is larger than 1850 DEG C; and the proportion of particles with particle sizes ranging from 0.1-1 mm is controlled to be 98% or above. According to the ladle stuffing sand prepared through the method, the raw materials can be fully and evenly mixed, and the influence of the segregation problem caused by uneven components on a self-opening rate is solved; and particularly, the self-opening rate of a high-quality special steel ladle with the refining time exceeding 3-8 hours is increased, and influence on the quality of molten steel caused by later oxygen burning and drainage is avoided.

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 relates to a continuous casting steel ladle no-drainage casting device. The continuous casting steel ladle no-drainage casting device comprises an upper water port mechanism and a lower water port mechanism; the upper water port mechanism is fixed at the bottom of a steel ladle, and has an upper water port connected with the steel ladle; the lower water port mechanism is correspondingly arranged below the upper water port mechanism; the lower water port mechanism has a lower water port and an argon blowing port; and the lower water port mechanism can transversely move corresponding to the upper water port mechanism to realize alternative communication between the lower water port or the argon blowing port and the upper water port. The continuous casting steel ladle no-drainage casting device facilitates increment of the self-open rate of continuous casting ladles, wherein a novel argon blowing slide plate for continuous casting steel ladles can realize a no-drainage sand casting process, so that the secondary pollution of molten steel is reduced.

The invention belongs to the technical field of high-manganese steel continuous casting production, and particularly relates to high-self-opening-rate stuffing sand suitable for high-manganese steel continuous casting production and a using method. The stuffing sand comprises, by mass, smaller than 25% of SiO2, smaller than 15% of Fe2O3, larger than 32% of Cr2O3, larger than 10% and smaller than 18% of Al2O3, larger than 8% of ZrO2, larger than or equal to 0.3% and smaller than or equal to 1.0% of carbon black and smaller than or equal to 0.3% of H2O; and according to the granularity of the stuffing sand, the proportion of 0.25 mm-1. 2mm is larger than 95%, and the proportion of the stuffing sand with the granularity smaller than 0.25 mm is within 2%, and the proportion of the particle size of 1.2-1.5 mm is within 3%. According to the stuffing sand, the probability of the drainage phenomenon in the continuous casting production process of the high manganese steel is greatly reduced, and the cleanliness and stability of the steel are improved while efficient continuous casting production of the stuffing sand is achieved. In addition, the using method is improved, so that the occurrence probability of molten steel permeation and the use cost of the special stuffing sand are further reduced.

The invention belongs to the technical field of steelmaking and molten steel pouring, and particularly relates to a method for electromagnetically controlling steel ladle drainage and vortex slag entrapment at the last stage of molten steel pouring. In order to overcome the defects in the prior art, the invention provides the method for controlling automatic drainage and tapping of a steel ladle by applying alternating currents to a coil for induction heating in the drainage process, and applying direct currents to the coil at the last stage of molten steel pouring so as to generate a stable magnetic field around a water gap to inhibit vortexes. Pollution of stuffing sand to molten steel can be avoided, the automatic casting rate of the steel ladle is increased to 100%, slag entrapment caused by the vortexes can be restrained at the last stage of molten steel pouring, the cleanliness and the yield of the molten steel are increased, and the automation degree of steel production is also increased.

The invention relates to a honeycomb duct for ladle filler sand. The honeycomb duct (8) comprises a funnel (1), a hollow metal tube (2), a pendulum bob (3), a support (4), two flying rings (5) and a hinge (6); the funnel (1) is located at the top part of the hollow metal tube (2), and is in the shape of a horn mouth; the two flying rings (5) are symmetrically distributed at the outer edge of the funnel (1); the pendulum bob (3) is located on the hollow metal tube (2); the pendulum bob (3) and the hollow metal tube (2) are connected by the hinge (6), so that the pendulum bob (3) can conveniently swing to knock the hollow metal tube (2); the support (4) is located at the tail part of the hollow metal tube (2), and is used for fixing the honeycomb duct (8) in position. According to the honeycomb duct disclosed by the invention, accurate feeding of the ladle filler sand can be ensured, the usage amount of the ladle filler sand is reduced, and the self-opening rate of a ladle is increased.