150results about How to "Improve metallurgical performance" patented technology

The invention provides a metallurgical composite pelletizing prepared through a twice pelletizing method, as well as a preparation method and an application thereof. The pelletizing is provided with a pelletizing shell formed by a central pelletizing core and a pellet material coating the outside of the pelletizing core. The internal pelletizing core of the formed pelletizing is in a reducing atmosphere, the outside of the formed pelletizing is in an oxidizing atmosphere, and the metallurgical composite pelletizing undergoing twice pelletizing satisfies the metallurgical requirements. The pelletizing core takes an iron-containing material and reducing coal dust or coke powder as raw materials in which adhesive and waste fly dust are added, and is obtained by means of disk pelletization or pressure pelletization. The pelletizing shell takes the iron-containing material and the pelletizing core as raw materials in which the adhesive is added, and is obtained by means of disk pelletization and taking the pelletizing core as the center of the sphere. Various metallurgical performance indexes of the composite pelletizing are highly better than normal pellets. The composite pelletizing not only realizes the harmlessness and the recycling of the waste fly ash, but also can greatly improve the technical and economic indexes of iron making blast furnaces. In addition, the composite pelletizing not only achieves such social benefits as energy conservation, emission reduction, environment protection and environment pollution treatment, but also can create considerable economic benefits.

The invention discloses a purpose of heavy metal sludge, an acid pellet and a preparation method and a purpose thereof. The invention takes stainless steel cold-rolling heavy metal sludge as a raw material for preparing the acid pellet of the sludge. The acid pellet of the sludge is mainly prepared by the following raw materials by weight percent: 5-50 percent of stainless steel cold-rolling heavy metal sludge, 30-70 percent of iron ore concentrate, 2-8 percent of composite binding agent, 4-15 percent of carbon powder and 10-30 percent of water. The preparation method of the acid pellet of the sludge comprises the main steps of pretreatment of raw materials, mixing of raw materials, pelletizing and roasting. The acid pellet of the sludge is used as a raw material of a blast furnace. The invention solves the problems that the prior art can not effectively treat and comprehensively utilize the stainless steel cold-rolling heavy metal sludge.

The invention relates to a method for preparing a TiAl alloy plate by argon atomization in powder metallurgy. The method comprises the following steps of: reducing the content of inclusions in TiAl alloy powders by purity smelting in a cold-wall crucible and high-purity argon atomization; performing hot isostatic pressure compaction on the high-purity prealloy powder which is atomized by pure argon under such conditions that the temperature is 1100 to 1300 DEG C, the pressure is 140 to 200 MPa and the compaction time is 2 to 4 hours; removing coatings of the alloy blank after hot isostatic pressure compaction and then performing surface treatment and coating; heating alloy and rolling at a high temperature; and removing coatings to obtain a powder TiAl alloy plate. The plate has the advantages of uniform deformation, good surface quality, fine and uniform texture, low oxide and impurity contents, small thickness, good overall mechanical property and high quality and reliability. The method solves the key problems in development and application of TiAl alloy powder-metallurgy plates, and provides a technical support for innovation and progress of civil industry and aerospace industry.

The invention discloses a mold powder for continuous casting of high aluminium-titanium-rare earth steel, which comprises the following compositions in percentage by weight: 20 to 40 percent of CaO, 30 to 50 percent of SiO2, 3 to 8 percent of F, 5 to 9 percent of Na2O, 0 to 5 percent of Li, 0.5 to 5 percent of C, less than 8 percent of Al2O3, less than 5 percent of MgO and the balance of inevitable impurities; and the alkalinity range of CaO/SiO2 is R+/-0.05, wherein R is alkalinity and is equal to between 0.917 and 0.333M; and M is the sum of mass percent of Al, Ti and rare earth elements in molten steel. The mold powder improves the performance, can meet the requirement of the continuous casting of steel types such as Al, Ti, rare earth and the like, fully guarantees the thickness, lubrication and consumption of a melt cinder layer, avoids causing surface defects of casting blanks such as cinder inclusion, cracks and the like or causing steel leakage due to too big withdrawal resistance, and effectively guarantees smooth continuous casting process and the surface quality of the casting blanks so as to produce high-quality casting blanks.

An improved cartridge case completely produced net shape on a progressive cold former that includes a trim to lengthy station with an internal shearing tool.

The furnace protecting oxide pellet is produced through grinding and mixing V-Ti concentrate and coarse concentrated titanium ore into material containing iron in 52-55 wt% and titania 17-20 wt%, mixing with bentonite as adhesive, stoving at 400-500 deg.c, making raw oxide pellet in a disc pellet making machine, roasting at 1200-1250 deg.c under over oxygen concentration 4-8 % for 15-30 min, cooling in the furnace, and sieving to obtain the furnace protecting oxide pellet with iron content of 50-53 wt%, titania content of 15-18.5 wt%, ferrous content lower than 1.5 wt%, and compression strength of 1500-2800 N each. The furnace protecting oxide pellet has excellent performance, and good furnace protecting effect.

The invention discloses a continuous casting tundish for improving cleanliness of molten steel and belongs to the field of ferrous metallurgy technology. The continuous casting tundish comprises a tundish, porous bricks, an overflow groove, a slag blocking wall and a dam. The continuous casting tundish for improving cleanliness of molten steel provided by the invention makes full use of the double effects of argon foam stirring and cleaning, is safe, practical, simple and convenient, can obviously improve the separation effect of impurities and gases in the molten steel and improve the cleanliness of the molten steel and the quality of billet steel and the like.

The invention relates to a pellet ore binder prepared by taking sludge generated in sewage treatment as a raw material. The binder comprises sludge in a preliminary sedimentation tank, sludge in a coagulation sedimentation basin or residual activated sludge, wherein the sludge in the preliminary sedimentation tank, sludge in the coagulation sedimentation basin or residual activated sludge are powdery sludge obtained by drying, crushing and treating. The invention also relates to an application and a usage method of the pellet ore binder prepared by sludge. The pellet ore binder prepared by sludge generated in sewage treatment is capable of raising the grade and the metallurgy performance of a furnace ore, reducing the iron-making cost, reducing the resource consumption and energy consumption, minimizing the pollutant discharge capacity and raising the capability of national steel material and product in the competition of international markets. The sludge generated in sewage treatment which is difficult to be treated can be obtained resource utilization with high efficiency, so that the mineral product resource such as bentonite and the like can be saved.

The invention provides a preparation method of high-vanadium high-chromium type vanadium titanium magnetite pellets and belongs to the technical field of blast-furnace smelting in a comprehensive utilization method of high-vanadium high-chromium type vanadium titanium magnetite. The preparation method comprises the steps that wet-grinding is performed on the imported high-vanadium high-chromium type vanadium titanium magnetite, compounding is performed according to a pellet raw material ratio, raw materials are dried and mixed, bottom water is added for material mixing, the materials are braised, pelletizing is performed, fresh pellets are screened, the pellets with the size being 8-16 mm are obtained, then drying and pre-oxidation, shaft furnace roasting and cooling are performed, and the high-vanadium high-chromium type vanadium titanium magnetite pellets are obtained. By means of the method, the problems that the pellet magnetite is prone to superfusion, therefore agglomeration or nodulation is caused, and the yield and quality of the finished pellets are influenced are solved, the quality of the fresh pellets is truly and effectively improved, and the yield and quality of the pellet magnetite are guaranteed.

The invention belongs to production techniques of ferronickel, and particularly relates to a method for producing pellets from laterite-nickel ore, which comprises the following steps: proportioning: evenly mixing 1-4 wt% of bentonite, 1-8 wt% of quicklime and the balance of nickel oxide; pelletizing: adding water to the uniform mixture until the water content reaches 10-15%, and pelletizing by using a pelletizer; screening to remove raw materials of which the particle sizes are smaller than 10mm, thereby obtaining qualified raw pellets; and roasting to solidify, and cooling to obtain the nickel pellets. In the invention, the pellets are made into alkaline ore with a certain alkalinity, and the amount of coke is reduced in the blast-furnace smelting, thereby improving the physical properties of the blast-furnace smelted ferronickel; and in the ferronickel smelting process, the coke ratio is low, the yield is high, and the content of nickel in the smelted ferronickel is high.

The invention discloses a method for preparing mixed iron powder cold-pressing pellets, belonging to the technical field of metallurgical pellet smelting. The method comprises the following steps: applying a formulated composite binder to compression moulding of mixed iron powder, wherein the proportion of the mixed iron powder is that iron ore powder: scale powder is 70:30; the material proportion in the process of compression moulding is that mixed iron powder: composite binder: water is 100:3.5-3.6:6-8. The method adopts a cold-pressing pelletizing process to prepare the iron power pellets meeting the use requirements, and all the performance indexes of the strength and the cracking temperature of green pellet and the compression strength of finished pellet of the pellets meet the quality requirements of the pellets. The technical problem of iron powder cold-pressing moulding puzzling iron and steel enterprises for a long term is solved. The method can fully utilize the current iron-containing waste in the iron and steel enterprises, solves the residue problem of the iron-containing waste, and achieves the purposes of reasonably utilizing resources and reducing environmental pollution. The method can be suitable for industrial production and has good economic, social and environmental benefits.

The invention relates to a method for preparing low-silicon high-magnesium iron ore pellets, which belongs to the field of metallurgy technology. The specific method is to pulverize and finely grind iron concentrate to obtain iron concentrate powder, which requires a fineness of -200 mesh ≥ 65%; Concentrate powder and binder are made into a mixture, which is subjected to high-pressure roller milling, drying, and then mixed by a powerful mixer; the mixture is pelletized by adding water to a disc pelletizer, and passed through a vibrating screen to obtain a particle size of 9‑ 15mm qualified green pellets; transported to the grate machine for drying and preheating, and then into the rotary kiln for roasting, after roasting, the high-temperature pellets are cooled and cooled, and the explosive powdered pellets are screened to obtain qualified low-silicon and high-magnesium pellets. The invention uses low-silicon and high-magnesium iron concentrate powder without adding magnesium-containing materials, and only uses ordinary binders to produce ternary alkalinity ≥ 1.5, containing MgO ≥ 3.30%, and containing SiO ₂ ≤3.5% pellets.

The invention discloses a burdening optimization method for sintering. Through adjustment of the using amount of each sintering raw material, sintered ore with high quality can be produced, wherein the yield, the dropping strength, the tumbler strength, the abrasion resistance index, the reducibility, the low-temperature reduction disintegration property, and the like of the sintered ore meet requirements of sintering and iron making production.

The invention discloses a titanium concentrate and vanadium-iron concentrate bulk concentrate acidic oxidized pellet and a preparing method thereof, and belongs to the field of metallurgy. The preparing method of the titanium concentrate and vanadium-iron concentrate bulk concentrate acidic oxidized pellet comprises following steps of uniform mixing of titanium concentrate, vanadium-iron concentrate and an organic binding agent, pelletizing, drying, oxidizing roasting, cooling, and obtaining the titanium concentrate and vanadium-iron concentrate bulk concentrate acidic oxidized pellet. The micro-size fraction titanium concentrate and the micro-size fraction vanadium-iron concentrate are used at the same time, the organic binding agent is arranged and used for pelletizing, under the high-temperature oxidizing atmosphere, roasting is carried out to prepare the acidic oxidized pellet, through control over the material proportion, pelletizing,, drying and roasting, the desulfurization degree reaches 95% or above, the pressure resisting strength of the titanium concentrate and vanadium-iron concentrate bulk concentrate acidic oxidized pellet is 1800N/pellet, and the S is smaller than 0.015%, and the application prospect is quite considerable.

The invention discloses an oxidized pellet production process using a chain grate-rotary kiln system, which comprises the following steps: (1) green pellets are dried, preheated and oxidized through achain grate, then materials passing through the chain grate are conveyed to the rotary kiln to be roasted and then conveyed to an annular cooler to be cooled, and pellet ore is obtained; 2) hot air exhausted from the first circular cooling section is conveyed to the rotary kiln, the hot air exhausted from the rotary kiln is conveyed to a second preheating section, and the hot air exhausted from the second preheating section is conveyed to an air draft drying section in an air draft manner; 3) hot air exhausted from the second annular cooling section is conveyed to the first preheating sectionin an air blowing manner; and 4) the hot air exhausted from the third annular cooling section is conveyed to an air blast drying section in an air blast manner. According to the scheme, hot air is blown into the first preheating section, so that the air pressure in the first preheating section is greater than that of the second preheating section, and gas in the first preheating section does notneed to be denitrified; and meanwhile, a stable hot air area is formed in the first preheating section, and the preheating effect of upper-layer and lower-layer pellets is guaranteed.

An improved method and system is described for applying a leach solution to ore in the process of heap leaching. The Hybrid Irrigation System (HIS) relies on both surface solution delivery techniques as well as sub-surface solution application to improve the solution uniformity and metallurgical performance of a leaching process. The methods and systems allow for controlled application of leach solution with a hydraulic head applied that can be adjusted or varied depending on the conditions of the ore from negative, atmospheric or positive pressure, while distributing leaching solution in a uniform manner independent of surface variability with respect to elevation and infiltration capacity of the ore surface. The systems and methods have particular application to low permeability ores like high clay content copper, silver, uranium, and gold ores and nickel/cobalt laterite, but can be used in any heap leach application where control must be maintained with respect to surface ponding, stability and accessibility, and uniform reagent distribution, resulting in improved leaching performance.

A centrifuge concentrator bowl includes a plurality of fluidized recesses at axially spaced positions along the peripheral wall. Each recess is defined by two side walls which has water injection holes for fluidizing materials collecting in the recess. Some of the recesses are at least partly defined by a removable insert member arranged to be attached to a suitable mounting on the wall of the bowl. Each insert member includes a face portion defining a surface facing toward the axis of the bowl for engaging the slurry and preventing wear. The face portion may include a side portion on one side or both sides located radially inwardly of a rib on a respective side of the recess and at least partly covering the rib so as to prevent the slurry from contacting the rib and causing wear to the rib.

The invention discloses a method for producing metal iron powder by using deep reduction of a rotary kiln. The method comprises the following steps: (1) pretreatment: raw iron ore, anthracite and limestone powder are ground to reach a certain fineness by adopting a ball grinder, are then mixed by a double-shaft mixer, and are pressed to form balls by a ball pressing machine; and (2) the deep reduction by the rotary kiln. The deep reduction specifically comprises the following substeps: (1) pellets are dried in a turning plate type drying machine, pass through a preheating section, a reduction section and a deep reduction section in the rotary kiln, and are finally discharged from the kiln for water quenching; and (2) the ore grinding, the screening and the magnetic separation are performed after the water quenching to obtain metal iron powder and iron particles. The method is characterized in that refractory iron ore incapable of being physically separated and enriched is firstly reduced to metal iron and conditions are created to polymerize and grow the metal iron; the separation and the enrichment of iron are realized through grinding and separation of a reduction product; and a new path is provided for the development and the utilization of the refractory iron ore.

Provided is a method for preparing iron coke. Iron coke green balls are subjected to destructive distillation in the mixed atmosphere of CO2 and CO, and the iron coke is prepared. In the mixed atmosphere, the partial pressure of CO2 is 10% or below. The iron coke green balls are briquettes formed by mixing and pressing baring powder coal and iron ore powder. The process is easy to operate, the phenomena that in the iron coke carbonization process, cracks are generated, and the iron coke is eroded by CO2 can be effectively avoided, the mechanical strength of the iron coke is improved, and the yield of the iron coke is increased.

The invention belongs to the field of pellets, and particularly relates to a pellet and a production method thereof. The pellet comprises, by weight, 2-4 parts of desulfurized fly ash mixed materialsand 96-98 parts of iron-containing powder, the desulfurized fly ash mixed materials comprise desulfurized fly ash and bentonite, the desulfurized fly ash accounts for 5-30wt% of the total weight of the desulfurized fly ash mixed materials, and the raw materials are palletized and baked to prepare the pellet. According to the pellet, the desulfurized fly ash replaces part of bentonite to serve as production raw materials of the pellet, and the dosage of the bentonite can be reduced when correlative performances of fresh pellets are met, so that taste, strength and metallurgical performances ofthe pellet are improved. The desulfurized fly ash serves as production raw materials of the pellet, so that resource utilization of the industrial solid waste desulfurized ash is achieved, the problemof waste of land resources caused by land occupation due to long-term stacking of the desulfurized ash is solved, the production cost of the pellet is reduced, and the pellet more has more market competitiveness.

The invention relates to a method for removing impurities by argon blowing by adopting a continuous casting tundish air curtain barricade technology. According to the method, a proper amount of high-alkalinity low-carbon tundish covering agent and the high-alkalinity low-carbon tundish covering agent with carbonized rice husks are added to each furnace on the liquid surface of molten steel in a region right above a strip-shaped air curtain barricade correspondingly according to low-carbon steel and non-low-carbon steel, and therefore the problem that the liquid surface fluctuation of the molten steel caused by argon blowing of the strip-shaped air curtain barricade is large can be solved, and the problem of secondary oxidation and slag entrapment of the molten steel can be more effectively prevented; and in addition, argon bubbles capture the impurities and float upwards to the tundish liquid surface to be adsorbed and more effectively removed by the high-alkalinity low-carbon tundish covering agent, and therefore the metallurgical effect of removing the impurities by argon blowing of the continuous casting tundish strip-shaped air curtain barricade can be improved.

The present invention belongs to the field of welding material technology, and is welding rod for welding joint of different kinds of steel, especially of heat resistant pearlite steel and stainless steel. The ultralow carbon welding rod of the present invention consists of: C 0.03-0.06 wt%, Si 0.2-0.5 wt%, Mn 0.5-0.8 wt%, Cr 1.5-2.5 wt%, Mo 0.4-0.65 wt% and V 0.10-0.35 wt%, except Fe. Compared with available technology, the present invention has simple and reasonable component design, capacity of effectively preventing the formation of the carbon immigrating layer in fusion area of joint, no martensite structure formed in the joint, excellent welding performance and high normal temperature and high temperature performance of the welded joint.

The invention provides a process for reducing and extracting iron from high-iron red mud. The process comprises the following steps: drying the high-iron red mud, crushing the dried high-iron red mudinto particles with the particle size of less than 1 mm, and mixing the particles with a carbon-based reducing agent to prepare high-iron red mud carbon-containing pellets; adding the high-iron red mud carbon-containing pellets, pulverized coal/coke powder and calcium oxide into a rotary kiln to be subjected to reduction roasting, wherein the roasting temperature is controlled to range from 1,050DEG C to 1,250 DEG C, the roasting time is controlled to range from 90 min to 180 min, and obtaining a submerged arc furnace molten material after roasting; and adding the submerged arc furnace moltenmaterial into a submerged arc furnace to be heated, melted and reduced, wherein the melting reduction temperature is controlled to range from 1,350 DEG C to 1,550 DEG C, the time is controlled to range from 30 min to 80 min, and iron oxide in the molten material is completely reduced into metal iron. The process disclosed by the invention solves the problems of high energy consumption, low magnetic separation iron ore concentrate recovery rate, massive existence of iron-aluminum isomorphism and iron-aluminum oxide solid solutions, difficulty in iron-aluminum separation and the like in the existing red mud iron recovery process.

An efficient long-service-life blowing method include the steps of introducing vanadium extraction converter flue gas and decarburization converter flue gas into an oxygen combustor; obtaining first-purity CO₂—N₂ mixed gas through the vanadium extraction converter flue gas; obtaining second-purity CO₂—N₂ mixed gas through the decarburization converter flue gas; obtaining O₂—CO₂—N₂ mixed gas through the decarburization converter flue gas; obtaining first-purity CO₂ gas through the second-purity CO₂—N₂ mixed gas; and using the first-purity CO₂—N₂ mixed gas for bottom blowing of the vanadium extraction converter, using the second-purity CO₂—N₂ mixed gas as a carrier gas for blowing iron ore powder into the vanadium extraction converter, and using the O₂—CO₂—N₂ mixed gas and the first-purity CO₂ gas as a carrier gas for bottom blowing of the decarburization converter and bottom injecting of lime powder into the decarburization converter.