243 results about "Iron ore sintering" patented technology

The invention disclose a method for obtaining ultra high batch layer sintering hematite by improving the thickness of iron ore sintering batch layer. The granule part of less than 0.1mm difficult to pelletize in the tradical art are branched off, separate treating to preparing a green pellets of 7-12mm, then adding to the mix processed by more than 0.1mm coarse ironstone, distributing, igniting, induced draft sintering according to the tradical art, cooling, pelletizing to obtain a sintering mine for refined iron for blast furnace. The air permeability of batch layer is improved in case that a great deal of air-channaels is formed between pellets made of fineiron ore and other the mix, accordingly the thichness of sintering batch layer can be 900-1100mm in case that sintering induced draft negative pressure is not increased, and abtain ultra high batch layer sintering hematite.

The invention relates to a high-ore-matching-ratio brown iron ore sintering technology. The weight ratio of brown iron ore and powdered iron in raw material proportion is (5-19):1, the moisture content of the first mixing is controlled to be 7%-8%, the mixing time lasts for 2-3minutes, and the temperature of the mixture is 50-62 DEG C; the moisture content of second mixing pelletizing is controlled to be 7-9%, the pelletizing time lasts for 2-3.5minutes, and the temperature of materials is 52-65 DEG C; the thickness of grate-layer materials in distribution is 20mm, and a sintering material layer is 780-900mm thick; the ignition temperature for sintering is1050-1150 DEG C, and the ignition time lasts for 1.8-2.2minutes; and the negative pressure for sintering is 12-15kpa, the machine speed is 0.9-1.2m/min, the vertical sintering speed is 29-34mm/min, the air leakage rate is no more than 40%, the cooling negative pressure is 11-14kpa, the temperature of a cooling section of a sintering machine is reduced to 250 DEG C below. By using the high-ore-matching-ratio brown iron ore sintering technology, energy is saved, consumption is reduced, cost is decreased and benefit is increased.

The invention discloses an inhibitor addition-based desulfurizing method in the iron ore sintering process, and aims to provide a desulfurizing method in the iron ore sintering process, which has the advantages of low investment cost, low operation cost and high desulfurization efficiency. In the method, an ammonia-containing compound is added into a bedding material layer at the bottom of a sintered material layer, ammonium sulfate generated in the reaction of ammonia which is decomposed from the ammonia-containing compound and sulfur oxide in the sintering process is adsorbed to dust and taken away by flue gas; ammonium sulfate-containing dust in the flue gas of an air bellows on the rear half part of a sintering machine is collected by a cyclone dust separator; and the collected dust is washed, filtered and dried to form dry dust, and the filtrate after filtration is concentrated, crystallized and dried to form ammonium sulfate.

The invention discloses an online prediction method for iron ore sintering bed permeability states. According to the method, a fuzzy clustering algorithm is employed; a trolley speed, a sintering end point and an end point temperature are taken as input data; the sintering bed permeability states are classified into five classes; a prediction model for the sintering bed permeability states is established by employing a support vector machine method according to history data of mixture particle size distribution, mixture moisture, a solid fuel proportion, bed thickness, mixture temperature, negative pressure of an ignition furnace and negative pressure of a 1# wind box, and the corresponding permeability state data; and the bed permeability states are predicted by employing the prediction model according to the online detection data of the mixture particle size distribution, the mixture moisture, the solid fuel proportion, the bed thickness, the mixture temperature, the negative pressure of the ignition furnace and the negative pressure of the 1# wind box. The method is scientific and reasonable. Through application of the method, the prediction result is accurate, and the hit rate reaches 87.5%.

The invention discloses a method for charging iron ore sintering fuel which includes steps as follows: mixing sintering-waited material with a first adding fuel into a mixer for mixing; mixing the once mixed material with a second adding fuel into a second mixer for mixing; adding the twice mixed material into a sintering machine, wherein, the second adding fuel position locates on a random position after once mixing and before twice mixing, the fuel is a mixture of once coke powder and second coke powder, or once smokeless coal and twice coke powder. The method is suitable for all kinds iron ore sintering containing vanadium titano-magnetite.

The invention provides a comprehensive treatment method for iron ore sintering smoke pollutants. According to the characteristic that the properties of sintering smoke at different positions of a sintering machine are different, the sintering machine is sequentially divided into a section I, a section II, a section II, a section IV and a section V from the machine head to the machine tail. The length of the section I accounts for one twelfth that of the sintering machine. The length of the section II accounts for one fourth to three tenths that of the sintering machine. The length of the section III accounts for one fifth to one fourth that of the sintering machine. The length of the section IV accounts for one fourth of the sintering machine. The length of the section V accounts for one sixth that of the sintering machine. Smoke in the section I, the section III and the section V circulates to a smoke hood of the sintering machine through a circulating flue. The proportion of circulating smoke is 45%-50%. According to the features of the smoke entering the sintering bed layer, the temperature is 200 DEG C-250 DEG C, the content of O2 is greater than or equal to 17%, the content of CO2 is less than or equal to 6%, H2O (g) is less than or equal to 8%, and the content of SO2 is less than or equal to 500 ppm. The smoke in the section II and the smoke in the section IV are treated by a comprehensive activated carbon desulfurization and denitrification system and then discharged.

The automatic main mineral identifying and quantitatively detecting method for high alkalinity sintered ore belongs to the field of metallurgical technology. The method includes four parts of preparing sintered ore sample, X ray diffraction condition for quantitative analysis, standard diffraction curve database of high alkalinity sintered ore minerals, and sectional optimizing fitting and computer software. The method of the present invention makes it possible to identify the minerals in high alkalinity sintered ore and measure the content fast automatically. In addition, the present invention has less sampling error and no visual error.

The method of utilizing additive modified coke to reduce NOx exhaust during agglomeration belongs to the field of metallurgical environment protecting technology. The technological process includes modifying coke through soaking coke inside 0.5-10.0 wt% concentration additive emulsion to load additive in 0.5-4.0 wt% of coke to the pores and surface, and agglomerating iron ore through burning the modified coke. The technological process can reduce the conversion of nitrogen in the coke to NOx and reduce NOx exhaust by 30-50 % while raising the coke burning rate and lowering the coke consumption.

The invention relates to a flue gas circulation and biomass energy combined iron ore sintering method. In the method, sintering flue gas which is positioned at the tail of a sintering machine and has high pollutant concentration is circulated to a sinter layer taking biomass as a fuel; the performance and using amount of the biomass fuel are controlled by controlling the components, temperature and circulating mode of circulating flue gas, so that flue gas circulation and biomass energy combined sintering heat transfer behavior and burning behavior have high matching property; therefore, the emission of harmful gas such as dioxin, NOx, CO and the like is reduced by flue gas circulation and CO2, SOx and the NOx are reduced by the biomass on the premise of ensuring the yield and quality index of a sintering ore, and the zero emission of COx is realized and the emission of dust, the dioxin, the NOx, the SOx and the like is greatly reduced through the synergic emission reduction effects of the flue gas circulation and the biomass.

A selective distribution and granulation method of fuel for enhancing iron ore sintering with biomass energy distributes biomass fuel at the core part of a mixture before sintering by two-stage granulation to properly reduce the burning rate of the biomass fuel and improve the burning degree of the biomass fuel, so as to achieve the purpose of enhancing biomass energy sintering, wherein the two-stage granulation comprises the steps of: firstly preparing biomass fuel, iron ore and quicklime in a granulating disc into mother nuclide with the granularity of 3-5mm, then mixing with iron ore, limestone, dolomite, quicklime, sinter returns and coke powder (or coal), and carrying out second granulation for 3-6min in a granulating drum, so as to obtain the mixture before sintering with the biomass fuel wrapped at the core part. By selective distribution technology of the biomass fuel, the biomass fuel can be applied to iron ore sintering so as to successfully substitute for 10-60% of coke powder and not to influence the yield and quality indexes of the sintered ore.

The invention provides a method for biomass carbonization instead of pulverized coal injection in a blast furnace. Dried straw and other biomass raw materials are extruded to obtain a machine-made rod, and the machine-made rod is carbonized by a carbonization furnace to obtain carbon powder at a temperature of 300 to 1000 DEG C. The carbon powder obtained by the furnace is mixed with pulverized coal and injected into the blast furnace to greatly reduce a coal ratio and flux usage amount and improve production efficiency; latent heat of flue gas is fully utilized to reduce emission of exhaust gas; the exhaust gas discharged from a combustion chamber is filtered and discharged into air through a microporous ceramic tube. Biomass resources and sensible heat of the flue gas, and oxygen and carbon monoxide in the flue gas are used in ironmaking production. In addition, the biomass resources can also be used as a substitute for the pulverized coal or coke powder used in iron ore sintering machines. The method comprehensively utilizes existing equipment to treat waste materials such as biomass raw materials and the flue gas, saves coking coal resources, fully exerts potential advantages of biomass energy, protects environment, and reduces costs.

The invention discloses a nitric oxide (NOx) control method based on inhibiting fuel nitrogen conversion during an iron ore sintering process. The method comprises the steps of screening particles less than 1mm from sinter return fines; after burdening the sinter return fines less than 1mm, fine hematite, quicklime, sinter fuel and hydrocarbon with cohesive action, performing prepelletisation of iron ore concentrate in a rotary drum mixer; performing pelletization on the obtained mixture, residual iron-bearing materials, solvents and the sinter return fines; laying out, igniting and sintering the obtained particles. By the method disclosed by the invention, emission reduction methods are respectively designed aiming at the conversions from volatile nitrogen and char nitrogen to NOx; through inhibiting the oxidizing reaction of fuel nitrogen (N) and promoting the reduction reaction of NOx, the emission of NOx during the sintering process is controlled; the method is strong in pertinence and good in emission reduction effect.

The invention relates to a method for segmental gathering, waste-heat utilization and SOx-NOx emission reduction of iron ore sintering flue gas. The method is particularly suitable for an iron ore sintering flue gas treatment process in the iron and steel industry. The method can serve as enterprise supporting construction for an existing sintering desulfurization process and also can serve as new construction for a mature sintering flue gas desulfurization process. The method includes a low-temperature high-NOx low-SOx flue gas and sintering ore heat exchange and NOx removal process and a high-temperature high-SOx low-NOx heat recovery and SOx removal process. The technological method provided by the invention can be used for fully recovering sintering ore and sintering flue gas waste heat and reducing emission of SOx and NOx at the same time, has the advantages of being short in process flow, high in applicability, low in investment and operation cost and the like, and has quite high application value.

The invention relates to the field of iron ore sintering equipment, in particular to interior temperature measuring equipment for a material bed of a belt-type sinterer. The interior temperature measuring equipment for the material bed of the belt-type sinterer comprises a fire-resistant tube, a thermocouple set, a protective sleeve and a dataline joint. The protective sleeve is fixedly connected with the fire-resistant tube. The dataline joint is installed in the fire-resistant tube. The thermocouple set is installed in the protective sleeve and is formed by arranging a plurality of thermocouples. The tops of the thermocouples are connected with the dataline joint. The bottoms of the thermocouples are stair-stepping. A slice for shielding an electrical insulating fiber body is arranged between two adjacent thermocouples. The gap in the fire-resistant tube is filled by high temperature resistant asbestos, and the gap in the protective sleeve is filled by high temperature resistant insulating particles. According to the interior temperature measuring equipment for the material bed of the belt-type sinterer provided by the invention, the temperature instantaneous values at different positions in the height direction in the sintering material bed can be tested with rapid response speed and small temperature measuring error. The interior temperature measuring equipment for the material bed of the belt-type sinterer can work in a comparatively severe environment in the production process. A bump is arranged on the fire-resistant tube, so that the measuring precision is further improved.

The invention provides a preparation method of a sintering flux for iron ore sintering, which can solve the problem of waste recycling of converter slags, also can produce a low-cost sintering flux, and reduces the damages of converter slags on the environment. According to the invention, converter slags and air are fully reacted at a high temperature of 800-1100 DEG C, a main ingredient SFCA (complex calcium ferrite) in an obtained sintering flux product can reduce the melting point of the flux, so that the formation of a liquid phase in the process of sintering is facilitated, therefore, the energy consumption is reduced, conditions are provided for the improvement of the efficiency of a blast furnace, the maximum value of converter slags is utilized as much as possible, the recycling of metallurgical slags is implemented, and the energy conservation and emissions reduction of enterprises are facilitated. The preparation method of a sintering flux for iron ore sintering disclosed by the invention provides products and technical supports for the reduction of ironmaking and steelmaking production costs and the implementation of energy conservation and emission reduction.

Provided is an additive composition for metal sintering, which comprises an alkali metal compound that is added together with calcium carbonate constituting a melting accelerator for lowering the melting point in the process of sintering iron ore or the like, in such a way as to be able to economise on a heat source such as coal or coke which is necessary for the sintering of the iron ore, reduce the melting point of the sintered ore and enhance sintering efficiency by means of a chemical mechanism wherein the additive composition is additionally used together with the alkali metal compound during the sintering of the iron ore; the alkali metal compound being one or more compounds selected from the group consisting of lithium(Li), potassium(K), and sodium(Na).

The invention discloses an iron ore sinter mixture distribution method. By adopting a mixture preparation technology of pre-mixing magnetite concentrate and coke powder and a matched mounting mode with a round roller, a magnetic system and a reflecting plate, the particle size segregation, the fuel segregation and the segregation of materials such as the magnetite concentrate and the like in the mixture distribution can be enhanced; the air permeability of a sinter bed can be further improved by enhancing the particle size segregation; through the enhancement of the fuel segregation, the heatdistribution is more reasonable, the uniform-heat sintering is realized, and the fuel usage is reduced; and through the segregation of the magnetite concentrate, the oxidation of the magnetite is sufficiently utilized to release heat, so that the heat accumulation effect is enhanced, and the fuel usage is further reduced. The method disclosed by the invention can comprehensively improve the air permeability, the heat distribution and the heat transfer condition of the sinter bed, reduce the fuel usage and obviously improve the yield and quality indexes of sinter; and the indexes such as the vertical sintering speed, the sintering machine utilization coefficient, the finished sintering product rate, the sinter tumbler strength, the reducing degree and the like can be improved to different degrees.

The invention discloses a detecting method for the iron ore sintering machine air leakage rate. The detection method comprises the following steps that detection devices are made firstly, and a row ofthe detection devices are arranged on a sinter bed; when sintering is conducted, wind speeds measured by all the detection devices are recorded, the material surface of the sinter bed is subjected tomesh generation, all wind speeds recorded by the detection devices from beginning to end sequentially serve as the wind speeds of all grid points on longitudinal boundary lines where the detection devices are located, and the effective air amount QY passing through the bed within unit time is calculated; the total flue gas amount QZ in a flue within unit time is calculated; the amount QE of vapour generated within the unit time is calculated; the QY, the QZ and the QE are converted into the amount under the standard state, the sintering system air leakage QLstandard within unit time is calculated, and the sintering system air leakage rate K within unit time is calculated. Accordingly, by means of an optimized sintering effective air amount measurement and calculation method, the calculation accuracy of the sintering air leakage rate is improved, maneuverability is high, rapidness and convenience are achieved, and then the theoretical basis is provided for lowering energy consumption and increasing the yield for sintering production.

The invention discloses an iron ore sintering test method which includes steps as follows: confirming object and influence factor of the iron ore sintering test method for processing multi-factor multi-level test; selecting suitable uniform design test method for confirming a used uniform design table; processing iron ore ingredient, mixing, igniting and air suction sintering test according with the confirmed uniform design table for obtaining a series test result; utilizing the test result corresponding to the factor level of the uniform design table for analyzing, using method of direct preferential and model optimum for confirming an optimum parameter combination of the iron ore sintering, and processing must validated test. The method can shorten test time, reduce energy consumption and obtain test result with high efficiency and high quality.

The invention belongs to the field of iron ore sintering, and particularly relates to a sintering method of high-titanium vanadium-titanium magnetite concentrates. According to the problem that the sintering performance of the high-titanium vanadium-titanium magnetite concentrates is poor in the prior art, the sintering method of the high-titanium vanadium-titanium magnetite concentrates is provided and comprises the following steps that a, the high-titanium vanadium-titanium magnetite concentrates, a sintering aid, return ore and potassium permanganate are mixed evenly to obtain a mixture; and b, the mixture in the step a is sintered, and when the temperature of sintering waste gas reaches the maximum value and starts to drop, sintering is finished. When the high-titanium vanadium-titanium magnetite concentrates are sintered, a potassium permanganate solution is added, and the sintering utilization factor, the sintered ore drum index and the sintering yield are increased. The method is easy to operate, the improvement effect of the sintering performance is remarkable, potassium permanganate raw materials are easy to obtain and low in price, and a brand-new manner is provided for improving the sintering performance of the high-titanium vanadium-titanium magnetite concentrates.

The invention discloses a method for soft measurement of an iron ore sintering process state. The method comprises the following steps of rearranging bellows waste gas temperature within a period of time, adopting curve fitting according to different subsections in the sintering process, and respectively calculating the positions of a waste gas temperature rising point TRP, an inflection point BRP and a sintering terminal point BTP. According to a provided sintering process state parameter soft measurement model, the moving law of a sintering material on a sintering trolley is considered; the bellows waste gas temperature within a period of time is rearranged, the curve fitting is adopted according to the different subsections in the sintering process, and the process state parameters TRP, BRP and BTP are solved respectively. The changes of the TRP and BTP obtained through calculation have a time sequence property, and the actual production conditions can be reflected more accurately.