35results about How to "Improve the strength of sinter" patented technology

The invention relates to a sintering technology of ferrochrome mineral powder, which comprises the following steps: adding bentonite binder, fuel and water for uniform mixing after more than 65 percent of mineral powder is ground to -0.074mm, and pelletizing; then, coating a layer of fuel on the surface of the spherulite; loading the product into a sintering machine, with the height of the material layer being 550 to 700mm; and igniting for sintering after drying and preheating, and cooling, smashing and sieving thermal sintered ore, thus obtaining the finished product sintered ore with particle size of 3-40mm and return mineral powder with particle size of -3mm. The technology has simple method and convenient operation, and by activating chromite, the technology reduces the reaction temperature, improves strength and output of the sintered ore, saves consumption of solid fuel, has strong adaptability to material, can realize industrialized production, and is especially suitable for sintering of granular ferrochrome mineral powder or ferrochrome concentrate.

The invention belongs to the field of metallurgy and mainly relates to a manufacture method for preparing a high titanium high pH value sintering ore by a v-ti magnetite concentrate ore. The technical problem needed to be solved is to provide a preparation method which takes the high titanium v-ti magnetite concentrate ore specially owned by Panzhihua as the material to prepare the high titanium high pH value sintering ore. The method is mainly characterized by taking the high titanium v-ti magnetite concentrate ore as the material with a sintering temperature of 1300 to 1400 DEG C. The technique of the invention applied to prepare the sintering ore is simply controlled; the high pH value sintering ore obtained by sintering is smelted; the technical economic indexes like the operating factors of a blast furnace, a coke ratio, a coal ratio, etc, and the like, are all improved. The method of the invention essentially improves the minimal components of a v-ti sintering ore, improves the intensity of the sintering ore and improves the metallurgy performance by improving the pH value of the v-ti sintering ore to 2.0 to 3.2, controlling a proper carbon addition amount and increasing the amount of a liquid phase.

The invention discloses a sintering process of manganese ore powder. The process comprises the following steps of: adding water to mix manganese ore powder, a binding agent, fuel, a fluxing agent and return ore as mixed ore, wherein the binding agent is formed by mixing manganese salt and organic matter and counts for 0.6-3.0% of mass of the mixed ore, the fuel counts for 3.0-6.0% of mass of the mixed ore, the fluxing agent counts for 3.0-15.0% of mass of the mixed ore, the return ore counts for 10-30% of mass of the mixed ore and the adding amount of water counts for 5.0-15.0% of mass of the mixed ore; preparing the mixed ore as pellets; and then coating a layer of fuel on the surfaces of the generated pellets, drying and preheating, subsequently firing and sintering as hot-sintered ore; and cooling, breaking and screening the hot-sintered ore to obtain finished product sintered ore and return ore. The sintering process of manganese ore powder disclosed by the invention combines the advantages of the pelleting process and the sintering process, so that the strength and the yield of the finished product sintered ore are greatly enhanced and the energy consumption is obviously reduced.

The invention discloses a sintering additive, which comprises the following parts: 20wt%-60wt% composite mineralizer,10wt%-30wt% oxidizing catalyst,15wt%-40wt% oxygenation agent and 10wt%-30wt% protective. The additive can improve sintering oaring strength, which reduces energy consumption effectively.

A device with a griddle and a process for generating power by efficiently recycling sinter waste heat relate to the technical field of waste heat power generation. The device comprises a sinter cooling system, a waste heat power generation system and a smoke system. The sinter cooling system and the waste heat circulation power generation system are connected through the smoke system to form a loop. The process includes 1) sinter cooling, 2) the smoke system and 3) waste heat power generation. The device and the technological process for waste heat power generation have the advantages of completely utilizing waste heat discharged in the sinter cooling process, obviously increasing power generation quantity, obviously reducing system self power utilization rate and being remarkable in energy-saving effect.

A furnace type efficient recovery system for flue gas waste heat of cooled sinter comprises an air blower, a cooling furnace, a primary dust remover, an emergency blow-off valve, a waste heat boiler, a secondary dust remover, a draft fan and a chimney. An outlet of the air blower is communicated with a cooling air inlet on the lower portion of the cooling furnace. A flue gas outlet on the upper portion of the cooling furnace is communicated with the primary dust remover, the waste heat boiler, the secondary dust remover, the draft fan and the chimney through pipelines successively. The emergency blow-off valve is arranged on a pipeline between the primary dust remover and the waste heat boiler. A connection pipeline is arranged between the draft fan and the air blower. The furnace type efficient recovery system for flue gas waste heat of cooled sinter has the advantages that the sinter quality is improved, the sinter return rate is reduced, flue gas parameters are stable, the system own power consumption rate is reduced, and the energy-saving effect is apparent.

The invention discloses a sintering method of fine Baima vanadium-titanium magnetite concentrate. The sintering method comprises the sequential steps of burdening, mixing with water, pelletizing, igniting and sintering, spraying CaCl2 solution and blast furnace processing, wherein based on mass, the water content in the mixed material in the water mixing step is 7.2-7.5%; the carbon content in the mixed material is 4.8-5.0%; the material layer height when igniting and sintering is 640-700 mm; and the mass concentration of the sprayed CaCl2 solution is 1.5-3%. Through optimizing of the sintering technical parameters, comprehensively improving of the water content of the sintering mixed material, the carbon content in the mixed material and the height of the material layer, the grain composition and the sinter components of the mixed material when the fine Baima vanadium-titanium magnetite concentrate is sintered are greatly improved; the sintering atmosphere, flux mineralization, sintering heat system and mineral crystallization in the sintering process are effectively strengthened, so as to improve the sinter product yield and quality, and enable the yield and the quality of the sinter and the metallurgical performance to be greatly improved.

The invention belongs to the technical field of steel metallurgy, and particularly relates to a sintering ore with uniform grain size and a production method thereof. According to the mass ratio in araw material, a main material comprises 5wt% - 10wt% of Brazil Coarse Fines, 10wt% - 15wt% Brazilian Blended Fines, less than or equal to 25wt% of PB Fines, less than or equal to 25wt% of Newman Fines, less than or equal to 15wt% of Mac Fines, less than or equal to 20wt% of Jimblebar Fines, less than or equal to 15wt% of Indian Fines, less than or equal to 25wt% of FMG Blended Fines, less than orequal to 25wt% of Western Fines, less than or equal to 15wt% of Super Special Fines, less than or equal to 15wt% of Yandi Fines, less than or equal to 15wt% of Robe River Fines; and an auxiliary material comprises 15wt% of return fines, 4wt% - 5wt% of dolomite fines, 6.4wt% - 7.5wt% of pale gray, 2wt% - 4wt% of limestone fines, 2.2wt% - 2.3wt% of coal fines and 2.1wt% - 2.2wt% of coke fines.

The invention relates to a sintering method of Mei Shan iron concentrate. The method mainly solves the technical problems of low strength and low yield of sintered ores produced by the Mei Shan iron ore concentrate with sintered return ores in the prior art. According to the technical scheme, the sintering method of the Mei Shan iron concentrate comprises the following steps of 1), preparing the ores, specifically, calculating the preparation mass ratio of the Mei Shan iron ore concentrate, iron ore powder, the sintered return ores, fluxes and solid fuel according to the technical quality indexes of the sintered ore; 2), preparing a Mei Shan iron ore concentrate prefabricated grain small ball; 3), preparing a sintered basic mixed material; 4), preparing a sintered comprehensive mixed material; and 5), carrying out material distribution on the sintered comprehensive mixed material on a sintering trolley, carrying out ignition and air draft sintering processes on the sintered comprehensive mixed material to produce a finished product sintered ore. The sintered ore produced by the method has the advantages of being excellent in metallurgical performance, simple in process, low in costand the like; the method improves the strength of the sintered ore with the Mei Shan iron concentrate and related technical economic indexes.

The invention relates to a double-layer sintering method, which comprises the following steps: 1) proportioning an iron-containing raw material, a flux and a fuel, and preliminarily mixing the proportioned materials to obtain a sintered preliminary mixture; 2) adding fuel into the preliminary sintering mixture, and mixing again to obtain a sintered remixed mixture; 3) paving a bedding material ona sintering trolley, paving the sintered remixed mixture on the bedding material to obtain a first distribution layer, and then performing primary ignition sintering on the first distribution layer; and (4) paving the sintered preliminary mixture on the first distribution layer to obtain a second distribution layer, carrying out secondary ignition sintering on the second distribution layer, and providing an external heat source for heating and heat preservation of the second distribution layer. According to the double-layer sintering method and sintering device provided by the invention, the fuel is innovatively distributed in the material layer according to the mode that the upper layer content is low and the lower layer content is high, so that the oxygen amount consumed by the upper layer sintered mixture is reduced, it is guaranteed that the lower layer sintered mixture can obtain the sufficient oxygen amount, and the problems that according to an existing double-layer sintering process, the lower layer sintering oxygen content is insufficient, and the sintering ore strength is poor are solved.

The invention belongs to the technical field of steel metallurgy sintering and discloses an additive for improving sinter reducibility, high-reducibility sinter and a preparation method thereof. The additive for improving sinter reducibility is made by mixing a boron-containing compound, hydrogen peroxide, permanganate and water, wherein the contents of the boron-containing compound, hydrogen peroxide and the permanganate are, by mass percent, 0.05%-5%, 0.1%-10% and 0.03%-3% correspondingly, and the balance is water. The method for preparing the high-reducibility sinter comprises the steps that common sinter obtained through sintering is broken and is then cooled in a ring cold machine, the trolley pitch diameter speed is lowered, the blast volume is adjusted, and when the surface temperature of the sinter reaches 400 DEG C-600 DEG C, the additive is sprayed on the surface. Through the additive and the method, other properties are not influenced while the sinter reducibility can be improved effectively, and the foundation is laid for blast furnace intensified smelting.

The invention discloses an additive for saving energy in the process of sintering iron ore. The additive is aminoethanol, which has a common name of ethanolamine. The using amount of the ethanolamine is 0.06 to 0.3 percent of the mass of coke powder for sintering. During use, the ethanolamine is dissolved in water to be prepared into a solution; adding the aqueous solution into the coke powder, mixing uniformly in advance; and mixing with blended ore and a fusing agent, and pelletizing for sintering. The additive can improve the combustion efficiency of the coke powder in the sintering process, reduce consumption of solid fuel, and improve the yield and quality of the sintered ore. The additive has the characteristics of wide sources, low cost, environmental friendliness and the like.

The invention discloses a high-temperature sintering technology for nickel mineral powder. The nickel mineral powder is composed of raw materials including, by weight percent, 35%-50% of the nickel mineral powder, 8%-10% of carbon powder, 10%-15% of iron powder, 0.6%-3% of a bonding agent, 3%-5% of fuel and 8%-15% of a fluxing agent. Compared with the prior art, the high-temperature sintering technology has the beneficial effects that a sintering method for the nickel mineral powder is simple in technological method and convenient to operate, additives such as waterborne macromolecules, furfural residues and coal ash are added in the fine grinding stage of the nickel mineral powder, an obvious grinding assisting effect is achieved, the activity of the mineral powder is effectively excited, and the reaction temperature of the mineral powder is reduced. Meanwhile, a segmented heating method is adopted in the high-temperature sintering process, the strength of sintered ore is improved, the yield of the sintered ore is increased, and consumption of solid fuel is reduced.

The invention discloses a metallurgical sintering synergist as well as a preparation method and application thereof. The synergist is prepared from the following raw materials in percentage by weight: 35-65% of steel slag, 0.1-2% of polyethylene glycol, 2-8% of fluorite, 0.05-2.5% of potassium permanganate, 0.5-8% of hydrogen peroxide, 1-5% of ammonium metavanadate, 0.5-2% of waste activated carbon and the balance of water. By optimizing the compound substances and using the synergist, the rotary drum quality of the sintered ore can be improved, the vertical sintering speed can be increased, the particle size composition of the sintered ore can be improved, RDI + 3.15 can be improved, the reduction degree and the molten drop performance can be improved, and the energy consumption can be reduced.

The invention relates to a magnesium-iron-calcium complexing compound flux for a puddling and sintering ore. The magnesium-iron-calcium complexing compound flux for the puddling and sintering ore is prepared from the components in percentage by mass: 0.25 percent to 0.75 percent of organic high-viscosity material, 11 percent to 13 percent of oxygenation sintering flux, and 86.25 percent to 88.75 percent of flux carrier. The organic high-viscosity material is a mixture of one or two of carboxymethylcellulose and a water soluble resin and is 0.25 percent to 0.75 percent by mass; the oxygenationsintering flux is iron oxide red (Fe2O3), has the granularity being less than or equal to 0.044mm, and is 11 percent to 13 percent by mass; and the flux carrier is a mixture of one or two of high-ironhigh-calcium refiring magnesium powder and calcite powder, and is 86.25 percent to 88.75 percent by mass. According to the magnesium-iron-calcium complexing compound flux for the puddling and sintering ore provided by the invention, more than 90 percent of sintering mixture is bonded and pelletized, so that the permeability of a sintered layer is improved, the height of the sintered layer is favorably increased, the solid fuel consumption is reduced, and low-temperature sintering is realized. The permeability of a sintered layer is improved, the sintering speed and the yield are improved, low-negative-pressure air-extracting and sintering can be adopted, the electric consumption is saved, and the energy is saved.

The sintering method comprises the following steps: S1, carrying out crushing and ball-milling treatment on coarse-grained ferromanganese ore, limestone and return mine, and then carrying out high-pressure roller milling to obtain a pretreated raw material; s2, after the pretreated raw materials are subjected to optimized ore blending, a binder is added and mixed uniformly, and a mixture is obtained; s3, pelletizing the mixture obtained in the step S2; s4, carrying out external rolling on the green pellets to obtain a solid fuel, so as to obtain a uniformly mixed material; and S5, distributing the uniformly mixed material, and then sequentially performing drying, ignition sintering, heat preservation, cooling, crushing and size stabilization to obtain finished pellets. In order to solve the problem that a liquid phase is difficult to form in the ferromanganese ore sintering process, a ball milling and high-pressure roller milling combined treatment process is utilized, the specific surface area of the ferromanganese ore is increased, the surface activity and reaction activity of the ferromanganese ore are improved, migration and activation of atoms in the high-temperature sintering process are promoted, the forming ability of a sintering liquid phase is improved, and the liquid phase amount is increased, so that the liquid phase consolidation effect of the ferromanganese ore is promoted; the sintering strength is improved.