1428 results about "Iron ore" patented technology

The invention relates to the technical field of screening, and discloses an iron ore powder and antifreezing agent mixed screening device which comprises a rack, and the surface where the top of the rack is located is inclined; a first bearing seat is mounted on the rack, a roller with a rubber wheel surface is rotationally connected to the first bearing seat, a universal coupling is connected to the shaft end of the roller, a shaft rod is connected to the other end of the universal coupling, a speed reducer arranged on a second supporting seat is connected to the free end of the shaft rod, and the second supporting seat is connected with the rack; the speed reducer is driven by a first motor arranged on the rack, and the first motor and the speed reducer transmit power through belt transmission; a drum screen assembly used for improving the mixing uniformity of the iron ore powder and the anti-freezing agent is connected to the rolling wheel in a rolling mode, and mixed materials are discharged from screen holes of the drum screen assembly. Mixing, screening, conveying and cleaning are integrated, mixing uniformity is high, screening efficiency is excellent, operation and maintenance are convenient and fast, and the requirement for mixing and screening of iron ore powder and an anti-freezing agent is met.

The invention belongs to the technical field of nondestructive testing, and discloses a gold ore and iron ore metal content detection method. The method comprises the following steps: acquiring an XRF energy spectrum by using an X-ray tube, acquiring an LIBS spectrum by using double-pulse Nd: YAG laser, and acquiring a Raman spectrum by using a semiconductor laser; performing baseline correction on the LIBS spectrum, performing Savitzky-Golay smoothing pretreatment on the Raman spectrum, and respectively extracting three types of spectrum characteristics; constructing a physical constraint network model, inputting XRF, LIBS and Raman features, and then outputting the correction content, fusion weight and LIBS dominant factors of Fe / Au elements; and finally, through a dynamic weight fusion strategy, combining XRF, LIBS fusion weights and network output parameters, calculating to obtain the content of the gold ore and the content of the iron ore. The technical breakthrough of multi-element cooperative detection and complex matrix interference suppression is realized, and the detection precision of Fe and Au is effectively improved.

The invention discloses a method and a system for measuring flow and iron content of fine iron ore pulp. The method comprises the following steps of: sleeving two detection coils with the same parameters on a transportation pipeline of iron fine powder ore pulp in a front-and-back spaced manner, connecting the two detection coils into a detection module, and acquiring two similar detection signals with time delay of the two detection coils when the detection signals flow through the iron fine powder ore pulp by using the detection module; and measuring and detecting the flow and the iron content by utilizing the property that the iron concentrate pulp contains ferromagnetic substances in the two detection signals. According to the invention, the volume flow rate of the iron fine powder ore pulp in the pipeline transportation process and the content of iron elements in the ore pulp can be detected in real time, the iron fine powder ore pulp can be monitored in the transportation process, control, distribution and settlement are convenient, and the iron content of the iron fine powder ore pulp can be known in real time, so that the iron content of the iron fine powder ore pulp can be known approximately.

The invention relates to the technical field of sintering technology and environmental resources in the iron and steel industry, in particular to a method for recycling sintered waste activated carbon powder, which comprises the following steps: mixing waste activated carbon powder with a flux and iron ore concentrate to prepare small balls with different carbon contents; the method has the beneficial effects that the waste activated carbon is efficiently and fully utilized in the longitudinal sintering direction, and the purposes of reducing the consumption of sintering solid fuel, improving the sintering efficiency and improving the sintering quality are achieved. Heat required by effective mineralization of the upper portion and the edge of the sintering trolley is improved, the quality of sintered ore on the upper layer and the edge of the sintering trolley is improved, and finally the purpose of reducing production and operation cost is achieved.

The invention relates to the technical field of iron ore tailing resource utilization, in particular to a method for preparing iron oxide yellow by leaching iron ore tailings through an advanced oxidation technology, which comprises the following steps: adding a required amount of iron ore tailing powder into a persulfate solution, stirring to react, adding a reducing agent, boiling, filtering, adding alkali liquor to adjust the pH value, and filtering, thereby obtaining the iron oxide yellow. Pure liquid containing ferrous ions is obtained; taking part of the pure solution containing ferrous ions, and adding a potassium hydroxide solution to obtain an iron oxide yellow seed crystal solution; adding a pure solution containing ferrous ions into the iron oxide yellow seed crystal solution, adding an alkali solution to adjust the pH value, reacting, and separating and drying a product to obtain the iron oxide yellow. According to the method, the persulfate is adopted to leach iron from the iron ore tailings, and the iron oxide yellow is prepared from the leachate; harmless treatment of the iron ore tailings and value-added utilization of valuable resources are achieved, the raw material source of the iron oxide yellow industry is widened, and a wider prospect is provided for development of iron oxide yellow.

The invention belongs to the technical field of mine ore washing equipment, and relates to improvement of the production efficiency of an elutriation machine, in particular to an elutriation system for efficient iron ore washing and separation and a control method thereof.The elutriation system comprises a concentrate pulp mixer, an overflow groove, an elutriation barrel, a supporting platform, an ore washing water path and a control system; the concentrate pulp mixer is arranged above the elutriation barrel, the overflow groove is formed in the lower portion outside the concentrate pulp mixer and is in an inclined table shape, the tailing outlet is formed in the bottom of the inclined table, the middle of the interior of the overflow groove is connected with the elutriation barrel, a middle barrel body of the elutriation barrel is divided into an inner barrel body and an outer barrel body, and multiple sets of magnet exciting coils are arranged between the inner barrel body and the outer barrel body. The lower part of the inner cylinder is connected with an inverted-cone cylinder; a stirring impeller is arranged below the concentrate pulp mixer; the lower part of the elutriation barrel is filled with direct-flow water and rotational flow water through an ore washing water path; the system automatically recognizes working condition changes according to the ore feeding property, the material amount, field data and database set values, the optimal operation mode is selected, a magnetic field, an ore removal valve, a water supply valve and the like are controlled, efficient and intelligent separation of iron ore powder is achieved, and the optimal ore washing effect is achieved.

The invention discloses a slow-release phosphate fertilizer as well as a preparation method and application thereof. Iron-phosphorus compound fertilizer is prepared by generating an iron oxide coating on the surface of the phosphate fertilizer through iron mineral precipitation. Wherein the iron oxide coating can prevent the phosphate fertilizer from absorbing moisture, reduce volatilization loss of phosphorus and realize controlled release of the phosphate fertilizer, the problems of phosphate fertilizer failure and excessive phosphorus loss are solved, and in addition, the coated iron ore used for synthesizing the compound fertilizer can supplement trace element iron in soil after being dissolved, so that the nutrition of the soil is improved. The invention further provides application of the slow-release phosphate fertilizer, along with dynamic changes of soil environment humidity and oxidation-reduction conditions, ferrous oxidation mineralization and phosphorus dissolution release on the surface of the controlled-release fertilizer have high controllability, the anaerobic-aerobic environment on the surface of the compound fertilizer can be changed through flooding-drainage, and the controlled-release intelligent phosphate fertilizer is formed; the controlled-release fertilizer is driven by water, the form change of iron in different environments is taken as a switch, the application method is simple, no influence is caused to the environment, and the controlled-release fertilizer is suitable for large-scale agricultural operation.

The invention discloses a method and equipment for melting, separating and extracting iron and rare earth in rare earth iron ore. The method comprises the following steps: obtaining a molten material of rare earth iron ore and reducing agent powder at 1200-1500 DEG C; the molten material is subjected to centrifugal treatment through a centrifugal separation solidification machine, the molten material is gradually cooled and solidified in the centrifugal treatment process, four coagulum layers are formed, the four coagulum layers are cut and separated, and iron and rare earth enriched substances are obtained; and the rare earth enrichment is subjected to hydrochloric acid leaching and oxalic acid or carbonate precipitation process treatment, and then mixed rare earth precipitation is obtained. According to the method, the iron recovery rate can reach 99%, the grade of a rare earth enriched product can reach 59% or above, the rare earth recovery rate can reach 80% or above, the separation efficiency is high, the iron and rare earth recovery rates are high, the technological process is short, the method is environmentally friendly, equipment is simple, and the cost is low.

The invention belongs to the technical field of rare earth metallurgy and resource comprehensive utilization, and particularly relates to a method for separating and recycling iron and rare earth elements in rare earth iron ore. According to the method for separating and recycling the iron and the rare earth elements in the rare earth iron ore, the iron and the rare earth elements in the rare earth iron ore are recycled through MgO reduction roasting, and the efficient separation and extraction process of the iron and the rare earth elements is achieved by adding additives such as a reducing agent and MgO and through the procedures of reduction roasting, magnetic separation, selective leaching and selective precipitation. And comprehensive utilization of the rare earth-containing iron ore can be effectively realized.

The invention discloses a method for recovering phosphorus through anaerobic digestion by adding sludge-based biochar, which comprises the following steps of: firing dewatered sludge serving as a raw material under an anaerobic condition to obtain carbonized carbon; or firing under an aerobic condition to obtain pyrolytic carbon, adding any sludge-based biochar obtained by firing into the hydrothermal dewatered sludge, and carrying out anaerobic digestion on the hydrothermal dewatered sludge; the hydrothermal dewatered sludge is obtained by performing hydrothermal pretreatment on dewatered sludge; and carrying out phosphorus recovery on the sludge-based biochar subjected to anaerobic digestion by utilizing a magnetic separation method. Compared with the traditional method for recovering the phosphate fertilizer from the sludge incineration ash, the recovery method disclosed by the invention is green and pollution-free, belongs to a sludge treatment mode of treating waste with waste, realizes effective combination of a heat treatment mode and a biological treatment mode, and has a good practical application value. Moreover, the prepared sludge-based biochar has the property of magnetism, so that the recovery rate of the subsequent blue iron ore is increased, and the separation difficulty and economic investment are reduced.

The invention relates to the technical field of dressing plant control, in particular to a LightGBM-based one-key ore grinding grading control method, which comprises the following steps of: preprocessing collected iron ore grinding production data through an industrial internet of things to obtain production data, constructing a data-driven dynamic prediction model by utilizing a LightGBM algorithm, and combining time-space lag cross-correlation and flattening data input to obtain a one-key ore grinding grading control model. And deploying the trained lightweight model to a PLC control layer, and completing optimization and adjustment of corresponding key process parameters. The method has the advantages that by collecting production data in real time and utilizing the LightGBM algorithm to construct the dynamic prediction model, key variables such as the rotating speed and the ore feeding amount of the mill can be accurately and dynamically adjusted, the ore grinding process is optimized, no-load and overload operation of the mill is reduced, and compared with a traditional control method, the ore grinding efficiency is remarkably improved; operators only need to set target parameters, key parameters such as the rotating speed and the ore feeding amount of the mill are optimized in real time through the LightGBM model, it is ensured that the ore grinding fineness stably reaches the standard, and frequent intervention and adjustment are not needed.

The invention relates to the technical field of iron ore grinding and separation processes, in particular to an iron ore grinding granularity soft measurement model method based on a depth forest, which comprises the steps of collecting iron ore grinding production data and preprocessing the data, extracting input features of an iron ore grinding granularity soft measurement model of the depth forest, and setting initial parameters for a depth forest model. Comprising the number n of decision trees in each forest, the size di of a sliding window, the step length stepi and the upper limit of the number of sliding times, multi-granularity window sliding and model generation, and generation of an iron ore grinding granularity prediction result; the deep learning method based on the random forest has higher prediction precision and stronger generalization ability when processing complex ore grinding process data, can monitor the granularity change in the ore grinding process in real time, and helps operators to carry out more accurate control, so that the production efficiency and the resource utilization rate are improved, and the energy consumption and the cost are reduced.

The invention relates to the technical field of ore particle screening, and discloses high-recovery-rate micro-fine-particle magnetite ore dressing equipment which comprises a mounting frame, a protective shell is fixedly mounted on the mounting frame, a screening assembly is arranged on the protective shell, and the screening assembly comprises a three-way pipe. In order to enable the high-recovery-rate micro-fine-particle magnetic iron ore preparation equipment to be suitable for efficient separation of high-added-value micro-fine-particle iron ore, the screening assembly is arranged, the screening assembly is matched with a power motor to drive a large belt wheel through a small belt wheel and a transmission belt, an output shaft drives an auger rod to push ore in a three-way pipe, feeding blockage is avoided, and the high-recovery-rate micro-fine-particle magnetic iron ore preparation equipment is suitable for efficient separation of high-added-value micro-fine-particle iron ore. And meanwhile, a centrifugal motor drives a trilateral frame to drive a centrifugal screen drum to rotate at a high speed, fine particles fall into a discharging hopper through screen holes by utilizing centrifugal force, and coarse particles are discharged from a first discharging pipe through a mounting drum. And the stirring paddle rotates synchronously to prevent the fine particles from accumulating in the funnel.

The invention provides an intelligent control algorithm for dust removal of a steel ore tank and an operation effect monitoring method thereof, and aims to improve the energy efficiency and emission control capability of a dust removal system of the steel ore tank. The system comprises a data acquisition module, a hierarchical control module and a multi-objective optimization module. The data acquisition module is used for acquiring dust concentration, fan rotating speed, energy consumption and equipment state signals in real time; the hierarchical control module adopts the combination of model predictive control (MPC) and fuzzy PID control to accurately adjust the rotating speed of a fan, the ash removal period and the opening degree of an air door; and the multi-objective optimization module dynamically adjusts the dust-energy consumption weight ratio according to the electricity price time period, and optimizes the balance between energy consumption and emission. The invention further comprises an operation effect monitoring method, the operation effect of the system is monitored in real time, the energy-saving effect is evaluated and optimization suggestions are provided by means of data comparison and analysis, comprehensive evaluation of the energy-saving rate and the performance, visualization of a monitoring report and the like. And green transformation and low-carbon emission targets of a dust removal system of the steel and iron ore tank can be realized.

The invention belongs to the technical field of dangerous solid waste resource recovery in the nonferrous smelting industry, and discloses a method for recovering arsenic trioxide by leaching arsenic sulfide slag from ferrihydrite. The arsenic sulfide slag is leached by ferrihydrite in an acid solution under the normal pressure condition, so that the leaching rate of arsenic in the arsenic sulfide slag is increased; and sulfur dioxide gas is introduced into the leachate to reduce arsenic in the solution, finally arsenic trioxide is obtained through evaporation concentration and cooling crystallization, meanwhile, oxygen is introduced into the crystallized liquid to oxidize and recycle iron, and cyclic utilization of resources is achieved. The method has the characteristics of simplicity and convenience in operation, low cost, safety, reliability and the like, the arsenic sulfide slag can be effectively recycled to prepare the arsenic trioxide product, and the purpose of treating waste with waste is achieved.

The invention discloses a system and a method for producing sponge iron by coupling a gasification furnace and a gas-based shaft furnace. The system comprises a coal pretreatment device for pretreating received raw material coal; the gasification furnace receives the raw material coal treated by the coal pretreatment device through a conveying device, and synthesis gas is obtained through reaction; the mixer receives furnace top gas generated by the gas-based shaft furnace, mixes the furnace top gas with synthesis gas to obtain mixed gas, and outputs the mixed gas to the dust remover; the high-temperature desulfurization device is used for carrying out desulfurization treatment on the dedusted mixed gas by using a high-temperature desulfurization agent, and the high-temperature decarbonization device is used for carrying out decarbonization treatment on the desulfurized mixed gas and outputting the decarbonized mixed gas to the gas-based shaft furnace; iron ore and / or oxidized pellets are / is arranged in the gas-based shaft furnace, the decarbonized mixed gas is received, and sponge iron is generated through reaction. According to the method, the synthesis gas is cooled by using the furnace top gas, additional cooling equipment is not needed, the cost is reduced, the energy utilization rate is increased, and cleaner and more efficient sponge iron production is realized.

The invention provides a method for preparing high-purity titanium from ferrotitanium complex ore, and relates to the technical field of nonferrous metallurgy. The method comprises the following preparation steps: calculating and adding a carbonaceous reducing agent according to the components of the ferrotitanium complex ore and a specific principle, mixing and pelletizing, and reducing to generate a Fe (alloy)-TiC-MOx mixture; according to the content of TiC and Fe in the mixture, adding metal iron powder and Fe2O3 or iron ore concentrate according to a certain stoichiometric ratio, mixing, pelletizing, and reducing to obtain a titanium-iron alloy; and the obtained ferrotitanium alloy serves as a soluble anode, and high-purity titanium is prepared through electrolysis in halide molten salt containing low-valence titanium salt. According to the method, the reaction characteristic of iron and iron oxide with TiC at high temperature is utilized, the ferrotitanium alloy is generated from the ferrotitanium complex ore to serve as the soluble anode, then the high-purity titanium is prepared through molten salt electrolysis, the adverse effects of component deviation and anode precipitates existing in the soluble anode containing the titanium compound are avoided, and meanwhile casting forming is easy, and the method is more suitable for industrialization.

The low-grade magnetite magnetic separation process comprises the following steps that 1, raw ore is crushed, the raw ore is magnetite with the magnetic iron content not higher than 10%, raw ore particles are obtained after the raw ore is crushed, and the particle size range of the raw ore particles is 1-2.5 cm; 2, primary strong magnetic separation is conducted on the raw ore particles, middlings and tailings I are obtained, the iron grade of the middlings is 14%-22%, and the iron grade of the tailings is 3%-5%; 3, the middlings are sequentially subjected to first-stage ore grinding, second-stage magnetic separation, second-stage ore grinding and third-stage magnetic separation, and iron ore concentrate and tailings III are obtained; and the tailings I are sequentially subjected to tailings grain decomposition and tailings magnetic separation to obtain tailings II and tailings III, and the tailings II are returned to secondary grinding again. According to the method, the tailings I are subjected to grain dissolving-regrinding optimization, the tailings I are subjected to secondary dissociation through a high-pressure roller mill or a dry crusher, micro-fine particle magnetic minerals are released, after magnetic separation is conducted, the tailings II are returned to the original process for further grain dissolving and magnetic separation, qualified iron ore concentrate products are obtained, and resource waste is avoided.

The invention discloses a medium-temperature preheating smelting reduction ironmaking system, which comprises a smelting reduction furnace, a smelting reduction furnace, a preheating furnace and a preheating furnace, the waste heat recovery part is connected to the coal gas outlet so as to change the high-temperature coal gas into medium-temperature coal gas; the heat exchange device is connected to the waste heat recovery part and the carrier gas source, and the heat exchange device is used for carrying out heat exchange on the normal-temperature injection carrier gas and the medium-temperature coal gas conveyed by the waste heat recovery part so as to obtain medium-temperature injection carrier gas; the hot ore supply part is connected to the heat exchange device and the smelting reduction furnace, and the hot ore supply part is used for providing preheated hot iron ore powder and conveying the hot iron ore powder to the smelting reduction furnace through medium-temperature injection carrier gas; and the pulverized coal supply part is connected to the heat exchange device and the smelting reduction furnace and conveys pulverized coal to the smelting reduction furnace through medium-temperature injection carrier gas. Hot iron ore powder and pulverized coal are conveyed through medium-temperature injection carrier gas, heat preservation is conducted on the hot iron ore powder and the pulverized coal, heat loss is reduced, reduction reaction is facilitated, the coal ratio is reduced, the ironmaking yield is increased, and energy conservation and environment protection are achieved.

The invention provides a biomass gasification coupling iron ore powder reduction device and method with CO2 circulation, and relates to the technical field of direct reduction of iron from biomass gasification products. The biomass gasification coupling iron ore powder reduction device with CO2 circulation comprises a biomass gasification reaction device and a circulating fluidized bed reduction reaction device. The method comprises a method of a biomass gasification reaction device and a method of a circulating fluidized bed reduction reaction device. Through structural arrangement and application of the biomass gasification reaction device and the circulating fluidized bed reduction reaction device, CO2 gas circulation, zero carbon emission and high-purity iron raw material efficient utilization preparation can be achieved; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention discloses an iron ore cold-bonded pellet, a raw material for the pellet and a preparation method of the pellet, and belongs to the technical field of cold-bonded pellet preparation. According to the iron ore cold-bonded pellet, pellet raw materials comprise mineral components, Na2O.nSiO2 and CaCl2, the mineral components comprise, by mass, 45-65 parts of sintering return mine and 35-55 parts of magnetite concentrate, and the addition amount of Na2O.nSiO2 and the addition amount of CaCl2 account for (4-5)% and (4-5)% of the total amount of the mineral components respectively. According to the preparation method, the magnetite concentrate and the sintering return mine are compounded, and Na2O.nSiO2 is used as an adhesive, so that the strength of the obtained cold-bonded pellets can be effectively improved; meanwhile, by adding CaCl2, sodium ions of Na2O.nSiO2 can be replaced, and the situation that the content of alkali metal in the pellets is too high is prevented.

The invention relates to a multi-physics field coupling method for a smelting process of a ferronickel heating furnace, and relates to the multi-physics field coupling method for the ferronickel heating furnace, the method comprises the following steps: establishing a ferronickel heating model, importing the ferronickel heating model into ICEM software for grid division, and finally importing a grid into FLUENT; according to the method, based on a Maxwell's equation and an Ohm's law, an electrothermal conversion algorithm, an electromagnetic induction algorithm and a multiphase heat transfer and mass transfer algorithm are compiled in combination with a user-defined function (UDF), so that a mathematical analysis model for mutual coupling of multiple physical fields, multiphase flows and furnace body thermal stress in smelting of the submerged arc furnace is established. The model is combined with a radiation model, a turbulence model, a multi-phase flow model and a static structure model, a heat and mass transfer mechanism among an electric arc, a molten pool and a furnace body is disclosed, an influence mechanism of a furnace body structure and a multi-physical field on furnace body temperature distribution is explored, and an action mechanism between the furnace body temperature and thermal stress is clarified, so that the deformation position and deformation amount of the furnace body are predicted.

The invention provides a foundation pit water gushing iron ore grading thixotropic blockage reduction method which comprises the steps that iron ore tailings are crushed and screened into multi-stage particle size particles, and a customized mold is subjected to 3D printing based on foundation pit scanning data; paving particles in a mold layer by layer, doping iron powder, and cementing and curing cement paste to form a prefabricated body; the prefabricated body is installed to a water gushing area, the slurry viscosity is increased through a grading contact network, a weak gravitational flow state is triggered to be transiently changed to an anti-scouring state, and water flow speed reduction is achieved; alternating field induction micro-vibration is synchronously started during lateral grouting, and grout permeation and bubble discharge are driven; after solidification, the guide core body is pulled away, and remaining pore channels are self-compacted by a grading system to form an anti-seepage structure. The method has the advantages that the anti-scouring performance is enhanced; particle-slurry-foundation pit curved surface triple self-adaptive combination is carried out; the engineering cost is reduced.

The invention discloses a method, a system and equipment for calculating a three-dimensional form of an iron ore body. The method comprises the following steps: acquiring magnetic anomaly data and a magnetic anomaly region of a known hidden magnetite body in a target region; the first top surface burial depth of the magnetite body is calculated or obtained through drilling data based on the magnetic anomaly area, and magnetization intensity three-dimensional distribution of the magnetic anomaly area is obtained; delineating a magnetic body range smaller than preset magnetization intensity according to the first top surface burial depth of the magnetite body and the magnetization intensity three-dimensional distribution; calculating the second top surface depth of the iron ore body according to the preset magnetization intensity, and counting the minimum value of the difference between the second top surface depth and the first top surface burial depth; and extracting a magnetization intensity distribution range which is greater than the inversion of the minimum value of the depth difference in the magnetization intensity inversion result, and calculating the form numerical value of the iron ore body according to the magnetization intensity distribution range.

The invention provides a belt tearing rapid detection and early warning device and method based on artificial intelligence, and relates to the technical field of equipment detection. According to the device provided by the invention, a monitoring unit is arranged at a blanking port, and a high-speed CCD (Charge Coupled Device) camera mounted at a 45-degree elevation angle works cooperatively with a laser transmitter to capture a line laser image at the bottom of a belt in real time; the core technology of the rapid detection and early warning method comprises the following steps: 1) an improved Sobel enhancement operator is used for inhibiting dust and water stain interference while keeping a real edge; 2) performing multi-scale LBP feature analysis, and accurately extracting crack textures in combination with dynamic threshold segmentation; the method comprises the following steps of (1) building a deformation index DI model to realize grading early warning, (2) building a deformation index DI model to realize grading early warning, (3) capturing space-time continuity through a 3D convolution kernel and realizing longitudinal crack detection in cooperation with the curvature quantification model, (3) building a distortion index DI model to realize grading early warning, (4) iron ore field verification shows that the transverse crack detection rate and the longitudinal crack early warning accuracy are both higher than those in the prior art, the false alarm rate in a dust environment is as high as 7%, and material leakage and safety accidents are effectively avoided.

The present invention discloses a method for reducing the hydrogen-rich reduction swelling of pellet ore based on stepwise reduction in a hydrogen-based shaft furnace, belonging to the technical field of direct reduced iron production. The pellet ore is successively reduced in the first-stage hydrogen-based shaft furnace (temperature: 780 - 880 °C, volume fraction of H2 + CO > 80%, and volume ratio of H2 / (H2 + CO) is 0.6 - 0.8) and the second-stage hydrogen-based shaft furnace (temperature: 980 - 1040 °C, volume fraction of H2 + CO > 90%, and volume ratio of H2 / (H2 + CO) ≥ 0.8), and then cooled to obtain direct reduced iron. This method can reduce the maximum reduction swelling rate of the entire pellet ore during the reduction process to less than 10% without using pellet additives such as calcium and magnesium. While ensuring the reduction efficiency of the hydrogen-based shaft furnace, it can produce direct reduced iron with quality indicators meeting the requirements and higher iron grade, which is conducive to realizing the clean, efficient, and short-process utilization of iron ore resources.

The invention provides a steel raw material weight measurement system based on three-dimensional scanning and dynamic density correction, and aims to solve the problems of low efficiency, large error and the like of a traditional weighing method and a volume estimation method in steel plant raw material weight measurement. According to the method, geometric point cloud data and spectral characteristics of a raw material pile are obtained through a multi-mode three-dimensional scanning module (including laser radar and multi-spectral imaging), and accurate classification of various raw materials such as iron ore, waste steel and flux is achieved in combination with raw material classification and a density database. Meanwhile, through a dynamic density correction model, factors such as raw material types, impurity proportions and moisture content are comprehensively considered, density parameters are dynamically adjusted, and the weight measurement precision is remarkably improved.

The present invention relates to a production expert system-based iron ore blending optimization method. The method comprises: firstly, performing data enhancement on historical ore blending and beneficiation data by means of an improved generative adversarial network; then, establishing a case library, and by means of a case retrieval method, establishing a relational model between blended ore properties and ore concentrate grades on the basis of the historical ore blending and beneficiation data and expert experience; then, on the basis of material balance, establishing a blended ore property prediction mechanism model to realize blended ore property estimation after ore blending; and finally, by taking an optimal ore beneficiation concentrate grade and a maximum difficult-to-beneficiate ore use amount as optimization objectives, determining constraints on the basis of actual working conditions, obtaining a set of ore blending proportion non-inferior solutions by means of a multi-objective grey wolf algorithm, and deciding an optimal solution by means of a TOPSIS algorithm. The present invention has the following advantages: while ensuring the quality of ore beneficiation products, reasonable ore blending proportions are calculated, the use amount of difficult-to-beneficiate ores is increased, the sustainable mining capacity of mines is improved while ensuring the mining and beneficiation benefits, and the invention has universal applicability.

The invention provides a manganese-silicon alloy smelting feeding regulation and control method and system, manganese iron ore and silica are pretreated to obtain fine manganese iron ore materials and silica powder, and the fine manganese iron ore materials and the silica powder are mixed with quick lime to obtain a spherical mixture; the spherical mixture meeting the preset morphological structure is screened for preheating treatment, and the feeding state of at least part of the preheated spherical mixture to the smelting furnace is adjusted based on the real-time preheating state characteristics of the spherical mixture; based on the feeding amount of the spherical mixture of the smelting furnace, the feeding state of coke to the smelting furnace is adjusted; the smelting reaction state in the smelting furnace is recognized on the basis of tail gas emission characteristics of the smelting furnace, so that the feeding state of the coke into the smelting furnace is adjusted again, all the spherical mixtures have material components with proper proportions, different materials make full contact, it is guaranteed that all the spherical mixtures can be independently subjected to smelting reaction, and the smelting efficiency is improved. And the feeding amount of the spherical mixture and the coke is adaptively adjusted, and the smelting reaction efficiency and the manganese-silicon alloy smelting yield are improved.

The invention discloses a method for recovering iron in tailings of copper separation from copper smelting slag through combination of microwave-assisted oxidizing roasting and magnetic separation, and belongs to the technical field of metallurgical solid waste resource utilization. The method comprises the steps that high-temperature copper smelting slag is subjected to water quenching, crushing and ore grinding, flotation and copper removal to obtain tailings containing silicon iron, after a calcium-based additive is added for ball milling and mixing, microwave oxidizing roasting is conducted under the oxygen-enriched condition, roasting products are subjected to high-gradient magnetic separation after crushing and ore grinding, and iron ore concentrate and magnetic separation tailings are obtained. According to the method, the strong wave-absorbing characteristic of fayalite is utilized, the roasting temperature and energy consumption are reduced through microwave heating, iron-silicon separation is achieved through a calcium-based additive, and iron is recycled through magnetic separation in one step. The final magnetic separation iron recovery rate reaches 85% or above, the iron ore concentrate grade exceeds 60%, magnetic separation tailings can be used as building materials, the process is simple, the cost is low, environment friendliness is achieved, the defects of a traditional process are overcome, and high-value utilization of solid waste is achieved.