34 results about "Open hearth furnace" patented technology

A multi-purpose, multi-oxy-fuel High Temperature Power Burner/Injector/Oxygen Lance, Mechanical System Apparatus Device, for steelmaking from recycled scrap and/or virgin ferrous charge, which can be employed in multi-oxy-fuel (natural gas; pulverized carbonaceous matter; heavy oil), especially by Oxygen Combusted mixture of Natural Gas/Pulverized Carbonaceous Matter in High Temperature Power Burner Mode, for efficient and rapid melting of solid ferrous charge (cold or preheated) in a special steelmaking Metallurgical Furnace or Open Hearth Furnace, Tandem Furnace, BOF, EAF, as its augmenting or only source of thermal energy; more than one Device in Oxygen-Natural Gas/Pulverized Carbonaceous Matter Power Burner Mode, can be employed as the only source of thermal energy in a modified, originally Electric Arc Furnace, as total replacement of Graphite Electrodes and Electric Arc System, the replacement being noticeably more primary energy efficient than the thermal energy provided by Graphite Electrode/Arc System; it also can be employed in an Solid Particles Injector Mode, for injecting of adequately granulated carbonaceous materials or lime into the molten steel for its carburizing or for foamy slag control; further it can be employed in a natural gas shrouded, pulsating oxygen stream, for vertically to the charge oriented soft blow supersonic Oxygen Injection Lance Mode, for decarburization of the molten metal contained in the hearth of the metallurgical furnace and foamy slag control; in one of the embodiments-generally arcuate-pivotally mounted, liquid media cooled composite body, is pivoted into and out of a furnace vessel through a small opening in the shell wall for auto-regulated constant optimal positioning of the Composite Body Tip against solid or molten charge, in each and all multi-purpose modes; furthermore, when inserted into the furnace vessel, the arcuate composite body can be rotated about its longitudinal axis for directing the oxy-fuel high temperature flame towards unmolten charge in the furnace; in an other-generally linear-embodiment, the liquid cooled composite body is attached to the mast type carrier allowing vertical movement of the composite body which enters the furnace vessel through a small opening in the furnace roof; the bimetallic, liquid cooled special tip assembly of both-arcuate and linear embodiments-of the composite body includes easy replaceable, independent, multi-opening nozzles, mounted in a protective, retracted position inside of the liquid cooled special tip assembly.

The invention discloses an iron-making method for producing granular iron by smelting reduction of high-phosphorus oolitic low-grade hematite in a rotary hearth furnace. The method comprises the following steps of: (1) material preparation: preparing the following raw materials in parts by weight: 7 to 8 parts of high-phosphorus oolitic low-grade hematite, 1 to 3 parts of coal and 0 to 3 parts of fluxing agents; (2) smelting reduction in the rotary hearth furnace: uniformly mixing the above three raw materials, granulating, drying, delivering raw pellets to the rotary hearth furnace, heating to 1250 to 1450 DEG C, maintaining for 25 to 40 minutes, allowing the smelting reduction in the rotary hearth furnace, and discharging high-temperature granular iron intermediates and slag from the rotary hearth furnace; (3) indirect water cooling: delivering the high-temperature granular iron intermediates (600 to 1100 DEG C) and the slag to an indirect water cooling barrel which is introduced with nitrogen gas and performing cooling; and (4) dry magnetic separation: performing dry magnetic separation on the cooled granular iron intermediates and slag to obtain the final product of granular iron. The method provided by the invention has a simple process, a short flow and high efficiency, does not need charred coal, and is suitable for processing high-phosphorus oolitic low-grade hematite.

The invention discloses a heat accumulating type rotary hearth furnace-wet sizing-submerged arc furnace nickel ore smelting method which comprises the following steps: a certain amount of lateritic nickel raw ore is dried, crushed, mixed with coal powder and caking agent, pressed into a ball containing carbon, distributed to a rotary hearth furnace by a distributing device and heated to 900 DEG C to 1250 DEG C for 10min to 40min; the ball containing carbon is reduced into a metallic ball with 70 percent to 90 percent of metallization rate, discharged by a discharge device, and directly sent into water to be cooled, milled and sized. The iron material containing nickel after milling and sizing is dried by high-temperature oxygen losing waste gas, agglomerated and then sent into a submerged arc furnace or other melting equipment to separate the slag and the iron, and produce molten iron containing nickel. The method has simple process, short process, high efficiency, does not need coking coal, is applicable in the production of ferronickel with lateritic nickel of all grades, and no waste gas, waste water and waste solid is discharged during production.

The invention provides a process for smelting vanadium-containing pig iron by high-silicon vanadium titanomagnetite concentrate powder, which comprises the following steps: preparing raw material particles with a particle size of 5-150 mm of carbon-containing cold-bonded pellets (blocks), sinter, roasted acidic pellets, and metallized pellets (blocks) from the concentrate powder, mixing the raw material particles with a solvent and a reducing agent, smelting in a smelting furnace to obtain vanadium-containing pig iron; according to the different components of the raw material particles, the solvent ratio during smelting is that raw material particle:limestone:dolomite:fluorite = 1:(0-0.25):(0-0.15):(0-0.10); the material blending principle is that the CaO:SiO2:TiO2 in the slag is controlled to be within a weight ratio range of 1:(0.5-1.2):(0.6-1.8); the invention solves the problem of difficult smelting of the vanadium titanomagnetite concentrate powder with high silicon, high titanium, and low iron; the smelting furnace relates to a blast furnace, an open hearth furnace, a submerged arc furnace and a hot blast cupola.

The invention relates to a calcium-magnesia phosphate fertilizer and a production method thereof. The calcium-magnesia phosphate fertilizer is prepared by mixing ferrophosphorus and phosphorus ore according to the mass ratio of 1:1.8-2.2, placing the obtained mixture in a high-temperature open-hearth furnace for melting, and hardening the mixture. The production method of the calcium-magnesia phosphate fertilizer comprises the following steps: mixing the ferrophosphorus and the phosphorus ore according to the mass ratio of 1:1.8-2.2, placing the obtained mixture into the high-temperature open-hearth furnace for heating to 1800-2200 DEG C to oxidize and burn phosphor in the mixture, and performing furnace tapping on a product and hardening the product, thus obtaining a semi-finished product of the calcium-magnesia phosphate fertilizer, and finally making the semi-finished product into a finished product of the calcium-magnesia phosphate fertilizer. The phosphor in the mixture is oxidized and burned by the way of direct air blasting to raise the temperature of the high-temperature open-hearth furnace. The production method is adopted to produce the calcium-magnesia phosphate fertilizer with high phosphor conversion rate, resources saving and low energy consumption.

The invention discloses a measuring method for the content of calcium oxide and magnesium oxide in open-hearth furnace slag, converter slag and electric furnace slag. The measuring method has the advantages of being rapider, more accurate and more efficient. A sample is dissolved with hydrochloric acid, nitric acid-hydrofluoric acid, perchloric acid is added for smoking, and after taking down and cooling, hydrochloric acid is added to heat and dissolve salt; the pH value of the test solution is adjusted to be 7 with ammonium hydroxide, the test solution is heated to be boiled, taken down, slightly cooled and filtered in a volumetric flask, sediment is washed 7-8 times with a hot ammonium chloride solution, after being cooled, the solution is diluted to scales for volume setting, two parts of equal solutions are taken respectively and put in two flasks, triethanolamine, water and a small amount of hydroxylamine hydrochloride are added to one part, the pH value is adjusted to be 12 after a potassium hydroxide solution is added, a proper amount of calcein is added, and titration is conducted with an EDTA standard solution till an end point that fluorescent green disappears and the amount of calcium is obtained; triethanolamine, water and a small amount of hydroxylamine hydrochloride are added to the other part, the pH value is adjusted to be 10 after an ammonia-ammonium chloride buffer solution is added, eriochrome black T serves as an indicator, and titration is conducted with the EDTA standard solution till an end point of pure blue and the resultant amount of calcium and magnesium is obtained.

The invention discloses a raw material treatment and pelletizing system process for a rotary hearth furnace (RHF). The process comprises the following steps of: conveying various high-zinc iron-containing dusts to be treated to a mixing tank for mixing; and moistening, grinding and pelletizing the dusts and adhesive mixture required by pelletizing to produce the high-zinc iron-containing pellets which meet the high index parameter requirements of the RHF. The process effectively overcomes the adverse factors, such as large fluctuation, poor pelletizing performance and the like, of the raw material components, such as zinc-containing dust, sludge and the like, by combining the actual conditions of the high-zinc iron-containing sludge and dust raw materials of each iron and steel plant, and has the advantages of perfect function, accurate ingredients, compact layout and reasonable manufacturing cost; and the high-zinc iron-containing pellets which meet the high index parameter requirements of the RHF can be stably produced.

The invention discloses a reduced iron discharging screw of a rotary hearth furnace, which is used for self-forming a hearth reduced iron on the discharging port of periphery, and discharging the hearth reduced iron to the outside of the furnace body. The reduced iron discharging screw has screw blade outside of the rotating axis, the inside of the discharging screw is cooled by the flow of cooling water, and the fireproof layer in the middle is formed outside of the rotating axis.

The invention discloses a bottom-blowing oxidation rough smelting technology for antimony ore and a metallurgical furnace. The bottom-blowing oxidation rough smelting technology for antimony ore includes the steps as follows: supplying heat by coking coal or lump coal, supplying air and oxygen into a hearth by a fan, adding coal and antimony ore burden into the hearth from the top or the upper side surface of the furnace body, enabling the air of the fan to blow into the hearth from bottom to top after the air passes through a distribution plate from the bottom of the hearth, allowing flue gas to enter a condensation dust-collection system from the upper side surface or the top of the furnace body, and discharging solid-state slag from the bottom or the lower side surface of the furnace body. The metallurgical furnace comprises the furnace body, wherein the top or the upper side surface of the furnace body is provided with a burden feed hole; the furnace body is provided with an air flow distribution plate at the bottom of the furnaced; the fan supplies air upwards from the bottom of the furnace through the air flow distribution plate; the top or the upper side surface of the furnace body is provided with a flue gas outlet for leading the flue gas to enter the condensation dust-collection system; and the bottom of the furnace body is provided with a slag discharge hole. The metallurgical furnace integrates the characteristics of an existing blast furnace, an open-hearth furnace and a roasting furnace and has the characteristics of high stock columns, thin stock layers, low coke rate and high recovery rate.

The invention relates to the technical field of materials, in particular to an acid-resistant, fire-resistant and thermal-insulation material high in comprehensive performance. The material is prepared from 90%-95% of silica bricks, 5%-10% of clay, 3%-10% of caprolactam, 1%-2.5% of hydroxy propyl cellulose and 1%-2.5% of hydroxyethyl cellulose. Accordingly, compared with the prior art, the preparation method is simple, the practicability of a finished product is good, technological operation is easy and convenient, the acid-resistant slag erosion capacity is high, refractoriness under load ishigh, the volume does not shrink after repeated calcination and even slightly swells, and the material is mainly used for thermal equipment such as coke ovens, glass melting furnaces and acid open hearth furnaces.

A return flow retorting open hearth furnace is made of inside and outside barrels, built in material encapsulating device, supporting device and drive device. The residue heat of oil contained solid material after retorting can be recovered with improved heat efficiency and reduced energy consumption.

The invention discloses a coating for iron founding and a founding method. The coating comprises the following components including sodium silicate, talcum powder, argil, white clay, microcrystallinewax and a siloxane compound. Iron ore and waste iron are added into an open-hearth furnace, and argon is introduced; the temperature is increased till the iron ore and the waste iron are all molten, apreheated smelting agent is added; and after the preheated smelting agent is added, stirring is carried out for 5 min to 8 min till uniform stirring is achieved; surface dross is skimmed, the furnacetemperature is reduced to 800 DEG C, a refining agent is added for refining, a casting mold is preheated to range from 100 DEG C to 150 DEG C, a coating is sprayed, and the casting mold is dried at the temperature being 150 DEG C for standby application; and molten iron is poured into the mold, and demolding is carried out after cooling. The coating is simple in ratio and is not prone to adheringto the surface of pig iron; and after the coating is adopted, the surface of the mold is directly coated with the coating, operation is simple, the demolding speed can be increased, and operation time is greatly saved.

Provided is a rotary hearth furnace which can stir exhaust gas within a furnace, to efficiently burn flammable gas within the exhaust gas and to efficiently heat an object to be heated, and which can contribute to reduction of specific energy consumption and improvement of productivity. A rotary hearth furnace (1) has therein a series of zone spaces (3) which are divided by vertical walls (2) hanging from a ceiling (1c). Among the zone spaces (3), the zone space to which an exhaust gas duct (4) is attached is constructed as an exhaust zone (3a). An oxygen-containing gas supply unit (5) is provided in the vicinity of the lower edge of the vertical wall (2) which divides the exhaust zone (3a) from the other zone spaces (3). Further, the exhaust gas duct (4) is disposed on the outer periphery side or the inner periphery side from the center of the width of the zone space (3).

The invention relates to a rotary hearth furnace. The rotary hearth furnace comprises a furnace body, a furnace bottom, a discharging device, a burner and a material water quenching device, and the cross section of the furnace body is in a circular ring shape, the furnace body is provided with a feeding opening, and discharging openings are formed at the bottoms of the inner ring side wall and theouter ring side wall of the furnace body; an annular reaction space is defined by the inner ring side wall and the outer ring side wall of the furnace body and the upper surface of the furnace bottom; the burner is mounted on the side wall of the furnace body, the discharging device is mounted on the furnace body, and a discharging opening body of the discharging device communicates with the discharging openings; and the material water quenching device is arranged on the outer side of the furnace bottom and comprises a material water quenching channel and a water quenching pool which communicate with each other, and the material water quenching channel communicates with the discharging openings. According to the rotary hearth furnace, the discharging device is designed to be the mode of discharging on both sides, materials in the rotary hearth furnace are completely discharged in time to prevent the furnace bottom and the furnace wall from being jammed due to multiple times of heatingand melting of the stored materials, sensible heat of the materials is fully utilized, and the rotary hearth furnace has the characteristics of long service life, high productivity and low energy consumption.