24 results about "Iron ore sintering" patented technology

The application discloses an on-line monitoring method for air leakage rate of an iron ore sintering system, which comprises the following steps: 1) adjusting sintering production parameters so that the sintering production state is stable, and obtaining sintering process working condition parameters in the stable state; 2) calculating working condition flue gas flow of a sintering main exhaust fan; 3) converting the working condition flue gas flow of the sintering main exhaust fan into standard condition flue gas flow; and 4) calculating actual sintering air volume through the sintering main exhaust fan, comparing the actual sintering air volume with theoretical sintering air volume of sintering materials in normal production, and obtaining total air leakage rate of a sintering-dedusting system. The sintering process working condition parameters in the stable production state are obtained in real time by using a sintering central control system, the working condition and standard condition flue gas flow of the sintering main exhaust fan are automatically calculated by deducting water vapor, the total air leakage rate of the sintering system including the sintering and dedusting processes is obtained in real time by comparison with the theoretical sintering air volume of the sintering materials in the normal production, and the purpose of conveniently and quickly monitoring the sintering air leakage rate in real time is achieved.

The device comprises a vertical mill, the vertical mill comprises a millstone, a tuyere ring is arranged around the millstone, the tuyere ring is provided with a flue gas inlet, a powder concentrator is arranged above the millstone, a flue gas outlet is formed in the upper side of the powder concentrator, a blanking hopper is arranged on the lower side of the powder concentrator, and a blanking pipe is arranged in the center of the blanking hopper. The vertical mill is provided with a coarse powder outlet, the material returning inlet and the blanking hopper are connected with the coarse powder outlet, the coarse powder outlet is connected with a feeding port of the suspension heat exchange device through the first reshipment device, and an air inlet of the suspension heat exchange device is connected with the hot blast stove. A discharge port of the suspension heat exchange device is connected with a return inlet of the vertical mill through a second transfer device, an air outlet of the suspension heat exchange device is connected with a flue gas inlet of the tuyere ring, the device can remove free water and crystal water in sintered powder while grinding pellet fine powder, magnetization is achieved in the grinding process, a closed loop of heat utilization is achieved, and the service life of the vertical mill is prolonged. The generation efficiency is improved; and the energy consumption is reduced.

The application discloses an iron ore sintering fuel particle size identification control system, which comprises an image acquisition unit arranged above the end of a belt at a position behind a crusher and used for acquiring image data of finished products after crushing; a server used for acquiring the image data of the image acquisition unit; and an industrial computer used for acquiring transmission data of the server, calculating a prediction result of roller spacing of the crusher, and issuing an instruction for adjusting the roller spacing of the crusher. The application further discloses an iron ore sintering fuel particle size identification control method. The application improves the automatic control level of fuel particle size, achieves the purposes of stabilizing sintering fuel particle size, reducing labor intensity, and improving the automatic and intelligent level, thereby supporting stable and smooth sintering production.

The utility model relates to the technical field of iron ore sintering equipment, and discloses an efficient iron ore sintering blowing carbon reduction device which comprises a heat insulation box, the top end of the outer wall of the heat insulation box is communicated with a heat exchange box, the top end of the inner wall of the heat insulation box is fixedly connected with a heat-resisting hole plate, and the bottom end of the heat-resisting hole plate is communicated with a plurality of natural gas nozzles. The left side of the heat-resisting hole plate penetrates through the heat insulation box and communicates with a connector pipe, hole partition plates are fixedly connected to the upper side and the lower side of the inner wall of the heat exchange box correspondingly, the adjacent sides of the two hole partition plates communicate with a plurality of cylinders, and the right side of the heat exchange box communicates with a steam pipe. According to the utility model, a natural gas pipeline is connected through the connector pipe, smoke generated by combustion passes through the hole partition plate and the cylinder, heat is transferred to purified water, the purified water is converted into water vapor, the water vapor is sprayed out through the steam nozzle, the blower is started to introduce air, and oxygen is increased, so that the replacement rate of solid fuel is improved, and the emission of carbon monoxide is reduced.

The application discloses a method for producing low-metamorphic coal into semi-coke for iron ore sintering, which comprises the following steps: washing low-metamorphic coal to obtain raw materials, and performing coal pyrolysis on the raw materials to obtain semi-coke particles, and screening semi-coke particles with a particle size of 12-15 mm for high sintering. The semi-coke produced by the method has an optimized microstructure and element composition, and its combustion performance and calorific value are closer to those of coke powder for sintering, so that the vertical sintering speed is basically unchanged before and after the process of replacing coke powder with semi-coke in a high proportion, thereby ensuring the performance of sintered ore, and the amount of nitrogen oxides generated is obviously reduced.

The invention relates to the field of iron ore sintering, and discloses a stepped flue gas waste heat deep recycling system for the iron ore sintering process, which comprises an iron ore sintering system, a first-stage solid particle power generation system, a second-stage plate heat exchanger power generation system, a third-stage organic Rankine cycle power generation system and a fourth-stage plate heat exchanger heat exchange system, the invention further discloses a novel bubbling heat exchange plate structural design. The structure synergistically strengthens turbulence and heat exchange area on microcosmic and macroscopic scales, so that the heat exchanger still keeps extremely high heat transfer efficiency under the working condition of low temperature difference, and waste heat is recycled to the maximum extent.

This invention belongs to the field of iron ore sintering technology and discloses a method for strengthening the sintering of high-ratio specular hematite. S1. Raw material pretreatment: Returned ore and dried limonite are sieved using a 0.25mm sieve. Returned ore and limonite with a particle size smaller than 0.25mm are mixed with specular hematite powder and then pretreated by high-pressure roller milling. S2. Mixing and granulation: The mixture is mixed with returned ore and limonite larger than 0.25mm, other iron-containing minerals, flux, and fuel, and then granulated. S3. Pre-oxidation: The granulated mixture is distributed, and after distribution, the material layer is pre-oxidized using hot air. S4. Sintering: The mixture undergoes ignition, sintering, crushing, and cooling sequentially to produce the finished sintered ore. This invention effectively improves the proportion of specular hematite, significantly reduces sintering energy consumption, and increases the strength of the sintered ore.

The application discloses a kind of sintered iron ore core particle high-temperature ore-forming characteristics detection method, belong to iron ore sintering technical field.The method is after CaO digestion and mixed with Fe2O3 Form calcium-iron mixed sample, while natural iron ore particles are processed into straight cylinder to obtain iron ore core particle sample and measure its cross-sectional area S1;Iron ore core particle sample is vertically placed in calcium-iron mixed sample inside directly below and is pressed into shape to obtain briquette sample;Sintering is carried out to briquette sample, the obtained sintered briquette is polished with sandpaper until the residual iron ore core particle is exposed and its cross section S2 is measured;According to S1 and S2, the core particle liquid phase transformation fraction (LPTF) is calculated to measure the high-temperature ore-forming performance of iron ore core particle;The method can evaluate the quality and performance of iron ore by detecting the dissolution degree of iron ore core particle in liquid phase during sintering ore-forming process, and can quantify the dissolution characteristics of iron ore core particle, more directly and accurately reflect the dissolution assimilation degree of iron ore core particle in sintering liquid phase.

The application discloses an electric heating plate lifting type iron ore sintering zero-carbon ignition heat preservation device, which comprises a sintering trolley and an ignition device arranged above the sintering trolley at the upstream of a sintering machine. The ignition device comprises an ignition heat preservation furnace and a lifting type electric heating plate device arranged on the ignition heat preservation furnace. The ignition heat preservation furnace is arranged above the sintering trolley. The lifting type electric heating plate device comprises a lifter, a power transmission load bearing rod, an electric resistance heating plate and a lifting motor. The lifter is installed on the upper portion of the furnace top of the ignition heat preservation furnace. The power transmission load bearing rod is arranged on the lifter and penetrates through the lifter and the furnace top of the ignition heat preservation furnace. The electric resistance heating plate is arranged above the sintering trolley and is connected with the lower end of the power transmission load bearing rod. The lifting motor is connected with the lifter and drives the power transmission load bearing rod to drive the electric resistance heating plate to move up and down through the lifter. The electric heating ignition is adopted, clean and green zero-carbon ignition is realized, carbon emission is obviously reduced compared with the prior art, ignition is uniform, and the service life of the ignition furnace lining is effectively prolonged.

The iron ore sintering ignition method based on the blast furnace hot air comprises the steps that an air inducing pipe is arranged between a hot blast stove and a sintering machine, high-grade oxygen-enriched hot air obtained after a blast furnace blast heating task is completed in the hot blast stove is induced, and the high-grade oxygen-enriched hot air is conveyed to an ignition section of the sintering machine through the air inducing pipe; the temperature of the hot air is adjusted to the target ignition temperature in an air mixing mode; through segregation material distribution, the proportion of the solid fuel in the thickness range of 30-80 mm on the surface layer of the sintering mixture is increased by 2-3% compared with the average fuel proportion of a material layer; and the hot air after temperature regulation passes through a nozzle on an ignition cover of the sintering machine. The high-temperature oxygen-enriched hot air of the blast furnace hot blast stove is directly utilized, gas combustion is completely abandoned, the Boudol reaction caused by oxygen consumption and high-concentration CO2 generation due to gas combustion is fundamentally eliminated, solid fuel can be sufficiently combusted in the oxygen-enriched atmosphere, and the utilization rate is remarkably increased.

The application discloses a method for realizing ultra-low temperature ignition by using biomass fuel in a sintering process, which comprises the following steps: uniformly laying biomass charcoal on the surface of a sintering material layer, and igniting under the conditions of micro-negative pressure formed by downward air draft perpendicular to the sintering material layer and a temperature of 450-700 DEG C. In the method, the biomass charcoal is used as a low-temperature ignition agent of a sintering ignition system and a trigger agent for igniting traditional fuels such as coke powder or semi-coke in the sintering raw material, and a gas fuel such as biomass gas or hot flue gas is used as an ignition heat source, so that the ignition task of the iron ore sintering can be completed at ultra-low temperature. Since the biomass is used as a renewable fuel with zero carbon emission in the sintering ignition process, the number of gas pollutants generated by the combustion of fossil fuels is significantly reduced.

This invention belongs to the field of iron ore sintering technology and discloses a collaborative optimization system and method for iron ore sintering based on active intelligent control of combustion front morphology. The system includes a physical sintering unit, a multimodal sensing network, an intelligent decision-making and control platform, and a multi-field collaborative execution mechanism, forming a closed loop of "perception-decision-execution-learning". The method includes: synchronously collecting multidimensional data inside the sintering bed; updating the state and predicting the combustion front morphology and pollutant generation trend through a digital twin model of mechanism-data fusion; generating an optimal composite control instruction set by using a generative multi-objective optimization decision engine combined with process constraints; coordinating the execution of instructions by adjusting the two-dimensional gradient negative pressure field and the three-dimensional coordinate precise injection; and realizing model self-learning and continuous system optimization based on feedback data. This invention realizes real-time analysis, prediction, and active control of combustion front morphology, and can collaboratively optimize sinter quality, energy efficiency, and pollutant emission reduction.

The invention relates to the field of solid waste treatment, in particular to a method for sintering waste incineration fly ash and sludge in cooperation with iron ore. Comprising the following steps: mixing the waste incineration fly ash and sludge according to a preset proportion, and carrying out collaborative dehydration and dechlorination treatment to obtain filter residues; the filter residues are subjected to heat treatment, organic matter in the filter residues is decomposed, and a heat treatment product is obtained; replacing part of quick lime with the heat treatment product to serve as a sintering flux, and blending the sintering flux with iron ore, the remaining quick lime and coke powder to obtain a mixture; and sequentially carrying out primary mixing, secondary granulation, material distribution, ignition, sintering, cooling and screening treatment to obtain the sintered ore. According to the method, an efficient and reliable fly ash and sludge collaborative recycling treatment path is constructed through a complete technical chain that the waste incineration fly ash and the municipal sludge are subjected to collaborative dehydration and dechlorination according to a specific proportion, high-temperature heat treatment is performed, and a heat treatment product is used for replacing part of quick lime to participate in iron ore sintering.

The application discloses a kind of based on rich hydrogen gas injection's ultra-low carbon sintering method, this method is in the iron ore sintering process, the sintering material surface from ignition heat preservation end to sintering end range is divided into N injection regions, corresponding sintering material surface is injected according to injection concentration Dt=D max *│sint│Injection hydrogen-containing gas.The method periodically and regionally changes the injection concentration of rich hydrogen gas according to the change of sintering time, which can provide sufficient heat for the sintering material layer while facilitating the gradual movement of the gas combustion front to the lower material layer, achieving uniform sintering of the overall material into blocks, and can replace solid carbon-based fossil fuel sintering at a high proportion or even completely, efficiently reducing the emission of COx, SOx and NOx.

According to the present invention, a numerical calculation method for an iron ore sintering process is for a sintering process for sintering a powdered substance that contains iron ore in a sintering machine to produce a sintered ore and includes a step for creating a calculation mesh for an area of the sintering machine that is formed by a starting material and a sinter cake and a step for calculating the state inside the sintering machine by calculating chemical reaction amounts, reaction heats, heat transmission amounts between gas molecules and solids, physical property values for substances, and temperature changes for the insides of cells and heat transfer amounts and gas molecule transfer amounts in the machine length direction and a layer thickness direction between cells.

This invention provides a method for calculating the state within a sintered layer, taking into account heat and gas mass transfer in two directions: the thickness direction and the machine length direction. [Solution] A numerical calculation method for an iron ore sintering process, comprising the steps of: creating a computational mesh in a region on the sintering machine composed of raw materials and sinter cake, in a sintering process in which a powdered material containing iron ore is sintered in a sintering machine to produce sintered ore; and calculating the state inside the sintering machine by calculating the amount of chemical reaction inside each cell, the heat of reaction, the amount of heat transfer between gas molecules and solids, the physical properties of each substance, the temperature change, the amount of heat transfer between each cell in the machine length direction and the layer thickness direction, and the amount of gas molecule movement between each cell in the machine length direction and the layer thickness direction.

The invention belongs to the technical field of iron ore sintering, and relates to a laser interference gas-assisted blowing iron ore sintering system and method, the system comprises an ammonia preparation unit, a unit for preparing brown gas by electrolyzing water, and a gas-assisted blowing sintering unit respectively connected to the ammonia preparation unit and the brown gas preparation unit; the gas-assisted blowing sintering unit comprises a gas mixing and conveying structure, a sintering vehicle and a laser interference nozzle; the laser interference nozzle is mounted at the tail end of the gas mixing and conveying structure, is communicated with the gas mixing and conveying structure and is arranged in a feeding surface area of the sintering vehicle in a surrounding manner; the laser interference nozzle is provided with a nozzle controller and a laser transmitter in signal connection with the nozzle controller; the laser transmitter obtains parameter information including the posture of the laser interference nozzle and the material state of the feeding surface area in real time; and the nozzle controller controls the gas injection amount, pressure and angle of the laser interference nozzle in real time according to the parameter information. According to the method, the problems that a traditional method depends on experience and regulation is lagged are solved, and the quality uniformity, the yield and the energy utilization efficiency of the sintered ore are improved.

This invention relates to a method for reducing dioxin emissions using electrolytic manganese slag and electric field dust collector ash, belonging to the technical field of metallurgical environmental protection. The method involves mixing iron ore, fuel, flux, and iron-containing dust slag to obtain a first mixture; the first mixture does not contain electric field dust collector ash; the electrolytic manganese slag is then mixed with the electric field dust collector ash to obtain a second mixture; the first and second mixtures are then combined and sintered, generating dust collector ash and waste gas; the dioxin toxicity equivalent concentration in the waste gas is ≤0.5 ng-TEQ / m³. 3 Discharge is carried out in a timely manner. Under the action of electrolytic manganese slag, not only is the combination of chlorine and hydrocarbons in the electric field dust collector effectively inhibited, but dioxins are also catalytically degraded, reducing the dioxin concentration. This achieves efficient treatment of dioxins in the iron ore sintering process and resource utilization of the electric field dust collector, saving production costs and resources.

The present application relates to the field of solid waste treatment, and particularly relates to a method for sintering of waste incineration fly ash and sludge in cooperation with iron ore. The method comprises the following steps: mixing waste incineration fly ash and sludge according to a preset ratio, and performing cooperative dewatering and dechlorination treatment to obtain filter residue; performing heat treatment on the filter residue to decompose organic matter in the filter residue, and obtaining heat treatment products; replacing part of the quicklime with the heat treatment products as a sintering flux, and performing batching with the iron ore, the remaining quicklime and the coke powder to obtain a mixture; and sequentially performing first mixing, second granulation, material distribution, ignition, sintering, cooling and screening treatment to obtain sintered ore. The present application constructs an efficient and reliable resource disposal path for fly ash and sludge by using the complete technical chain of dewatering and dechlorination of waste incineration fly ash and municipal sludge according to a specific ratio, high-temperature heat treatment, and using the heat treatment products to replace part of the quicklime to participate in iron ore sintering.

The invention discloses an ore blending method for improving the sintering utilization coefficient of iron ore, which comprises the following steps: measuring molecular water of each iron ore, measuring the shrinkage rate of each iron ore, calculating the molecular water * shrinkage rate of each iron ore, and calculating the prediction (molecular water * shrinkage rate) of different preset ore blending schemes. And selecting a scheme with a high predicted (molecular water * shrinkage) value as a target ore blending scheme. According to the ore blending method, the basic characteristics and the high-temperature characteristics of the raw materials are integrated, the characteristics of the iron ore are not changed in ore blending, sintering ore blending can be guided more accurately, and the problem that in the prior art, an ore blending method is complex or inaccurate is solved.

The invention relates to the technical field of sintering processes, in particular to an iron ore sintering equipment process which is characterized in that the whole equipment is of a structure shaped like a Chinese character'tian 'and comprises four independent large combustion furnaces A, B, C and D. Each large combustion furnace is divided into a plurality of grid areas, and a common flue gas collection channel (1 # main flue and 2 # main flue) and a medium auxiliary system are arranged in the middle of a furnace body. The middle flue of the combustion furnace is divided into two sections, and the two furnaces (A and D, B and C) share one section of flue; two bin entering belt conveyors (namely a 1 # material distribution vehicle and a 2 # material distribution vehicle) are arranged in the middle of the other bin, and the same bin provides materials for the two furnaces (A, B, C and D) in the corresponding direction; a vertical square sintering furnace structure is adopted in the top structure of the equipment, an air draft system is arranged on the top, a plurality of air draft air guide pipes are arranged from the bottom of a flue to all combustion furnaces in a dispersed mode, a separation structure is arranged in each combustion furnace, and independent regulation and control of a single separation bin are achieved in cooperation with a top gate plate.

The invention belongs to the field of resource utilization of metallurgical solid wastes, and provides a method for separating valuable metals from multi-source metallurgical solid wastes. The method comprises the following steps: sintering a material containing valuable metals, a fuel and an additive, enriching the high-value metals in sintering fly ash through sintering air draft, and reserving metal iron in a sintered material; according to the method, raw materials and the whole method are specifically set, high-value metal elements are enriched in the fly ash, the high-value metal elements in the fly ash can be efficiently separated and extracted through follow-up treatment, the high-value metal elements are prevented from entering the sintered material again, meanwhile, harmful elements in the iron ore sintered material are reduced, and the method is suitable for industrial production. The quality of sintered ore is improved; the method disclosed by the invention has the technical effects of high resource recovery rate, high product purity, environment friendliness and low process energy consumption.

The present application belongs to the technical field of iron ore sintering, and particularly relates to a hydrogen-ammonia coupling injection device for an iron ore sintering process and a use method. Through the coaxial structure design of 'internal hydrogen and external ammonia', the ignition timing of hydrogen is effectively delayed by using the high ignition point characteristics of the ammonia sheath layer, so that the mixed gas burns only when it reaches the sintering material surface, greatly improving the heat energy utilization rate. The swirling vane significantly strengthens the shearing mixing effect of hydrogen and ammonia in the flight process, ensuring that the synergistic effect of 'hydrogen assisting ammonia combustion' fully plays a role, and reducing the ammonia escape risk from the root. The telescopic guide sleeve provides a stable mixing and flight channel. The integrated monitoring mechanism and controller, opening and closing mechanism constitute a quick-response safety interlocking system, and comprehensively improve the reliability of the device in handling high-risk media.