602 results about "Magnetite" patented technology

A magnetic separator for a magnetite powder production process, comprising a magnetic separation box (1). An opening is formed in a side wall of the magnetic separation box (1), and a door (2) is hingedly connected at the opening; the door (2) is provided with an observation window (3); a feeding channel (5) is obliquely arranged on the magnetic separation box (1); a feeding hopper (4) is fixed on the top of the feeding channel (5); a material distribution mechanism (6) is arranged inside the magnetic separation box (1); a primary magnetic separation drum (7) and a secondary magnetic separation drum (8) are rotatably mounted in the magnetic separation box (1); multiple partition strips (9) are evenly arranged on the side wall of the primary magnetic separation drum (7) along the circumferential direction; and a driving mechanism (10) is mounted on the side wall of the magnetic separation box (1) away from the door (2), and is used for driving the primary magnetic separation drum (7) and the secondary magnetic separation drum (8) to rotate synchronously.

The invention belongs to the technical field of ironmaking, and particularly discloses a method for producing titanium-rich direct reduction iron and high-titanium slag by using vanadium titano-magnetite, which comprises the following steps: preparing vanadium titano-magnetite raw ore into vanadium-titanium-iron concentrate powder and titanium concentrate powder, mixing the vanadium-titanium-iron concentrate powder and the titanium concentrate powder with a binder to prepare iron-titanium concentrate composite green pellets, and oxidizing and roasting to obtain the titanium-rich direct reduction iron and high-titanium slag with the compressive strength of more than 2000N / pellet and the compressive strength of more than 2000N / pellet. The reduction expansion rate of the iron-titanium concentrate composite high-titanium pellets is smaller than 20%; the iron-titanium concentrate composite high-titanium pellets are subjected to a direct reduction reaction in a shaft furnace, and titanium-rich direct reduced iron with the metallization ratio larger than or equal to 85% is obtained; and molten iron and high-titanium slag are obtained after the obtained titanium-rich direct reduced iron is subjected to melting separation through a melting separation electric furnace. According to the method, the iron-titanium concentrate composite high-titanium pellets meeting the direct reduction smelting requirement of the gas-based shaft furnace are prepared and applied to the gas-based shaft furnace for direct reduction production of the titanium-rich direct reduction iron, high-quality titanium-rich raw materials can be provided for smelting titanium slag in a melting electric furnace, and the problem that the recovery rate of titanium resources in existing vanadium titano-magnetite is low is effectively solved.

The invention discloses a method for recovering iron and titanium in vanadium titano-magnetite, and relates to the technical field of vanadium titano-magnetite beneficiation. Raw ore is crushed, and then is subjected to roller milling and screening to obtain oversize and undersize products; undersize products are subjected to weak magnetic pre-selection, tailings obtained after weak magnetic pre-selection and strong magnetic pre-selection are subjected to strong magnetic pre-selection, concentrate obtained after weak magnetic pre-selection and strong magnetic pre-selection are sequentially subjected to first-stage grinding, first-stage weak magnetic separation, second-stage grinding, second-stage weak magnetic separation and second-stage weak magnetic concentration, final iron ore concentrate is obtained, the obtained tailings are combined into iron separation tailings, then the iron separation tailings are subjected to titanium separation grinding, medium magnetic iron removal and strong magnetic roughing, and iron separation tailings are obtained. And tailings obtained after strong magnetic roughing are subjected to strong magnetic scavenging, concentrates obtained after strong magnetic roughing and strong magnetic scavenging are subjected to gravity roughing and gravity concentration, and final titanium concentrates are obtained. By adopting conventional crushing, high-pressure roller grinding, magnetic separation, pre-selection and tailing discarding, the subsequent ore grinding and selecting cost can be effectively reduced, the iron and titanium grades of the ore entering the grinding process are improved, high efficiency and energy conservation are achieved, and the ore dressing efficiency is improved.

The invention relates to the technical field of data analysis, in particular to a multi-source data-based concealed vanadium titano-magnetite bed target area delineation method and system, which comprehensively considers various factors possibly influencing drilling, such as geological condition complexity and drill bit wear risk, and has relatively low potential risks in various aspects of trajectory selection. The probability of unexpected conditions such as drill bit damage and borehole wall collapse in the drilling process can be effectively reduced, smooth drilling work is guaranteed, the drilling effect abnormity prediction result and the difficulty abnormity reflect the advantages and disadvantages of the drilling track from different angles, and the drilling efficiency is improved. The drilling effect anomaly prediction considers the influence of various abnormal conditions possibly occurring in the drilling process on the final drilling result, the difficulty anomaly focuses on the drilling difficulty of the trajectory, the two are fused and analyzed, the feasibility and the risk degree of each trajectory are evaluated more comprehensively and accurately, and the prediction accuracy is improved. And the influence degree of the track drilling process on ore deposit target area detection is reduced.

The invention belongs to the technical field of magnetite beneficiation, and particularly relates to a method for removing iron impurities in minerals through manual and automatic three-stage combination in magnet beneficiation, a three-stage iron removal system is arranged, the iron impurities and ferromanganese are detected step by step according to the size of the iron impurities and the property of magnets or ferromanganese, and a detected magnetic field is cooperatively calibrated step by step; and iron impurities in the ores are removed in a classified manner. Compared with the prior art, the system has the beneficial effects that a manual and automatic three-stage combined iron removal solution is adopted, large magnetic iron impurities, small magnetic iron impurities and ferromanganese impurities in the process are efficiently classified and removed in a targeted manner, damage of the iron impurities to equipment such as an ore crusher and a belt conveyor is avoided, the operation efficiency of the process is improved, and the production cost is reduced. And the problem of removing iron impurities in magnet beneficiation is solved.

The invention belongs to the technical field of metallurgy and biomass utilization, and particularly relates to a method for extracting iron from high-iron bauxite by taking biomass as a clean reducing agent. The method comprises the following steps: (1) uniformly mixing high-iron bauxite and biomass, heating to 600-700 DEG C under an anaerobic condition, and roasting to obtain a roasted material; (2) dissolving out the roasted material obtained in the step (1) by adopting a Bayer process to obtain solid slag and a dissolved-out solution; and (3) the solid slag obtained in the step (2) is subjected to magnetic separation, and iron ore concentrate is obtained. According to the method, the high-iron bauxite and the biomass are uniformly mixed and then are subjected to high-temperature reduction under the inert atmosphere condition, hematite is reduced into magnetite in the process, then the iron ore concentrate and the red mud with extremely low iron and aluminum content are obtained through the dissolution and magnetic separation process, and the iron ore concentrate can be used as an ironmaking raw material. The comprehensive utilization of the high-iron bauxite and the biomass is realized, and the utilization problem of iron resources in the high-iron bauxite is solved.

Provided is a laminated iron core including: a laminate of electromagnetic steel sheets and a granular oxide that contains magnetite and covers a side surface of the laminate, in which a contact angle of a water droplet until 20 minutes elapses after dropping the water droplet on the side surface covered with the granular oxide is 80° or more. When heights of peaks detected in ranges of 2θ of 41° to 42° and 38° to 39° in XRD measurement of the side surface covered with the granular oxide are represented by H1 and H2, respectively, H1 / (H1+H2) is 0.8 or more.

The invention discloses a pre-concentration and tailing discarding process for vanadium titano-magnetite, and relates to the technical field of vanadium titano-magnetite beneficiation, and the pre-concentration and tailing discarding process comprises the following steps: raw ore is subjected to crushing operation to obtain a crushed product, and the crushed product is fed into high-pressure roller grinding operation to obtain a high-pressure roller grinding product; the high-pressure roller-milled product is subjected to screening operation, and an oversize product with the large particle size and an undersize product with the small particle size are obtained; the undersize products are subjected to first weak magnetic pre-concentration operation, tailings obtained through the first weak magnetic pre-concentration operation are subjected to first strong magnetic pre-concentration operation, concentrate obtained through the first weak magnetic pre-concentration operation and concentrate obtained through the first strong magnetic pre-concentration operation are combined into final pre-concentration concentrate, and the tailings obtained through the first strong magnetic pre-concentration operation serve as one part of final tailings; the oversize products are subjected to second weak magnetic pre-concentration operation, tailings obtained through the second weak magnetic pre-concentration operation are subjected to second strong magnetic pre-concentration operation, and concentrate obtained through the second weak magnetic pre-concentration operation and concentrate obtained through the second strong magnetic pre-concentration operation are combined and then returned to the high-pressure roller grinding operation; tailings obtained by the second strong magnetic pre-separation operation are used as one part of final tailings. According to the method, crushing, high-pressure roller grinding and screening are adopted, oversize and undersize products obtained through screening are subjected to magnetic separation, pre-concentration and tailing discarding, oversize product pre-concentration concentrate is returned to the high-pressure roller grinding, the subsequent ore grinding and selecting cost is effectively reduced, the iron and titanium grades of subsequent ore entering the grinding process are improved, the load capacity of the high-pressure roller grinding machine can be reduced, and energy consumption and production cost are reduced.

The invention relates to the technical field of jigging magnetic flotation columns, and discloses a jigging magnetic flotation column which comprises an inner cylinder, a magnet exciting coil is fixedly connected to the periphery of the inner cylinder, and an outer cylinder is arranged on the periphery of the magnet exciting coil; a conical concentrator is fixedly connected to the bottom of the inner cylinder, and a pulsation mechanism is arranged on one side of the conical concentrator; and the inner cylinder is connected with a feeding mechanism. The technical problems that a large amount of washing water needs to be used for elutriating the magnetic separator, and the concentration of reagents is affected by adding water into a flotation column are solved, the magnetic separation method for magnetite by applying magnetic levitation is possible, the magnetic separation magnetic field intensity is synchronously and reversely adjusted, and the problems of overflow tailing black running and magnetic ore concentrate magnetic inclusion caused by jigging pulsation are solved; the accidents that the ore pulp of the flotation column runs out of the groove and overflows and the elutriation magnetic separator runs out of the groove and overflows are prevented, and the product recovery rate and the concentrate index are also improved.

The invention provides a method for enriching vanadium and titanium slag through hydrogen-based shaft furnace hydrogen-rich gas reduction-electric furnace melt separation regulation and control of vanadium titano-magnetite. According to the method, the metallization rate of metallized pellets is larger than or equal to 90% and the residual carbon content is 1t through H2-rich reduction (high H2 concentration and staged temperature control); 0.5%; caO and MgO are added in the melting and grading stage to regulate and control slag phase composition, and high-grade vanadium-titanium slag with TiO2 larger than or equal to 45% and V2O5 larger than or equal to 2.3% and low-carbon molten iron are obtained. The high-efficiency separation and carbon footprint of iron, vanadium and titanium in the vanadium titano-magnetite is reduced by more than 50% compared with a traditional process, high-quality raw materials are provided for titanium dioxide and vanadium extraction, and the method has the advantages of high efficiency, cleanness and low consumption.

The invention discloses a preparation method for separating iron, vanadium and titanium in vanadium titano-magnetite by a wet method, belongs to the technical field of chemical metallurgy, and particularly adopts the technologies of hydrochloric acid ore dissolution, solid-liquid separation, iron powder reduction, freezing crystallization, extraction and the like to gradually separate and obtain titanium, iron and titanium products. By means of the method, the ore dissolving efficiency can be effectively improved, the technological process is shortened, traditional vanadium precipitation wastewater and treatment cost are avoided, titanium, iron and vanadium can be effectively separated and recycled, and value maximization of the South African vanadium titano-magnetite is effectively achieved.

The invention discloses an automatic medium adding method for a medium library of a coal preparation plant, a storage medium and electronic equipment, and the method comprises the steps: obtaining the medium library information of the medium library, and calculating the volume of a to-be-added concentrated medium, the mass of to-be-added magnetite powder and the volume of to-be-added clear water according to the medium library information; inputting the medium library information into a preset medium library digital twin model to obtain key information of the medium library; according to the coordinates of the highest point of the medium pile, a model prediction control algorithm is adopted to generate an optimal traveling track, and the traveling crane is controlled according to the real-time coordinates of the traveling crane, the traveling speed and the optimal traveling track; according to the mass of the magnetite powder to be added, the coordinates of the grab bucket, the opening and closing state of the grab bucket and the mass cumulant of the grabbed materials, direct medium discharging and / or differential medium discharging are / is executed; and if the medium placing in-place signal is received, a clean water pump and a blower device are controlled according to the volume of the clean water to be added. According to the invention, automatic medium adding of the coal preparation plant is realized, and control precision and efficiency are improved.

The system is formed by combining and connecting a coarse crusher (1), an ore washing sieve (2), a large dry magnetic separator (3), a wet magnetic separation preselector (4), a fine crusher (5), a dry magnetic separation scavenging machine (6), an aggregate screening machine (7), a preselected concentrate dewatering sieve (8), a preselected tailing dewatering sieve (9), a preselected concentrate concentration magnetic separator (10) and a preselected concentrate filter (11). An ore discharge port of the coarse crusher (1) is connected with a feeding end at the upper part of the ore washing sieve (2), an oversize discharge port of the ore washing sieve (2) is connected with a feeding belt of the large dry magnetic separator (3), and an undersize discharge port of the ore washing sieve (2) is connected with an ore feed port of the wet magnetic preselector (4). Slurry on the surface of high-silt-content raw ore is washed off through screening and ore washing operation, and the ore blocking condition is reduced; dry separation and wet separation processes are combined, a large number of tailings are thrown out in advance, meanwhile, various building material products are produced, and the resource utilization rate is increased.

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 a copper slag self-pulverization iron extraction method and application thereof.The copper slag self-pulverization iron extraction method comprises the steps that copper slag and a calcium oxide-based additive are mixed to obtain mixed copper slag, the calcium oxide-based additive comprises calcium oxide and / or a calcium oxide raw material, the calcium oxide raw material can generate calcium oxide through heating, and the calcium oxide raw material can generate calcium oxide through heating; the adding amount of the calcium oxide-based additive meets the condition that the total mass of the primary calcium oxide and / or the generated calcium oxide is 29%-47% of the mass of fayalite in the copper slag; after the mixed copper slag is heated to 1250-1700 DEG C, heat preservation is conducted for 30-120 min, and modified copper slag is obtained; slowly cooling the modified copper slag at a cooling rate of 0.25-1 DEG C / min to obtain self-pulverization copper slag; and magnetic separation is performed on the self-pulverization copper slag, magnetite is recycled, and the technical problems of tedious production line and high energy consumption caused by the fact that procedures such as crushing and ore grinding cannot be avoided in the common technology are ingeniously solved.

The invention relates to an efficient beneficiation process for recycling iron from iron tailings, which comprises the following steps of: feeding magnetite tailing pulp into a tailing recycling machine, feeding concentrate of the recycling machine into a first-section magnetic separator, and feeding concentrate of the first-section magnetic separator into a concentration magnetic separator; directly feeding concentrate of the concentration magnetic separator into a tower mill, feeding discharged ore of the tower mill into a swirler, and returning settled sand of the swirler to the tower mill to form closed-circuit ore grinding; overflow of the cyclone is fed into a second-stage magnetic separator, second-stage magnetic separator concentrate with the grade being 38% or above is obtained, and the second-stage magnetic separator concentrate is fed into a moxa sand mill; ore discharged by the moxa sand mill is fed into a third-section magnetic separator, concentrate of the third-section magnetic separator is fed into a fourth-section magnetic separator, concentrate of the fourth-section magnetic separator is fed into an elutriator, the concentrate of the elutriator is final concentrate, and the grade reaches 66% or above; the elutriator returns to the first section, the second section, the second section, the third section and the fourth section, and tailings of the magnetic separators are converged into comprehensive tailings. By optimizing the technological process, the concentrate grade is improved by more than 2%, and meanwhile, the tailing grade is reduced by 0.3%.

The invention provides a method for extracting iron through copper slag sedimentation and application thereof.The method for extracting iron through copper slag sedimentation comprises the steps that copper slag and a calcium oxide-based additive are mixed to obtain mixed copper slag, the calcium oxide-based additive comprises calcium oxide and / or a calcium oxide raw material, the calcium oxide raw material can generate calcium oxide through heating, and the calcium oxide-based additive is added into the mixed copper slag; the adding amount of the calcium oxide-based additive meets the condition that the total mass of the primary calcium oxide and / or the generated calcium oxide is 29%-47% of the mass of the fayalite phase in the copper slag; the mixed copper slag is heated to 1200-1800 DEG C for ore phase reconstruction, and modified copper slag is obtained; and after the modified copper slag is crystallized and settled for 10-20 hours under the condition of heat preservation, mother liquor is collected, and an iron concentrated solution is obtained. According to the method, magnetite in the copper slag can be purified and recycled through devitrification and sedimentation, the process is simplified, and energy consumption and mineral separation pollution in the crushing and ore grinding process in the common technology are effectively avoided.

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 discloses a magnetic suspension combined beneficiation method for micro-fine particle low-grade refractory magnetite, which comprises the following steps: first-stage ore grinding, first-stage grading and low-intensity magnetic separation are carried out, the obtained first-stage low-intensity magnetic separation concentrate is subjected to second-stage pre-grading, second-stage ore grinding, low-intensity magnetic separation and magnetic separation column I separation, and the obtained magnetic separation column I concentrate is subjected to reverse flotation operation; one-time roughing, one-time scavenging and three-time concentration are adopted in reverse flotation operation, products in a groove after third-time concentration are final iron ore concentrate, tailings of a magnetic separation column I and flotation scavenging tailings are fed into a magnetic separation column II to be subjected to three-section pre-classification, three-section ore grinding, low-intensity magnetic separation and separation, and the tailings of the third-section low-intensity magnetic separation, the tailings of the first-section low-intensity magnetic separation and the tailings of the second-section low-intensity magnetic separation are mixed to be final tailings. The final tailings are used as an iron correcting agent for producing the iron-containing Portland cement. The method has the advantages of being high in iron ore concentrate grade, small in flotation feeding amount, high in flotation feeding grade, stable in index, easy and convenient to produce and maintain, high in adaptability and the like.

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 discloses a double-direct-separation low-carbon beneficiation method for grinding and pulping extremely-lean magnetite, and belongs to the technical field of beneficiation. The method comprises the treatment processes of coarse crushing treatment of raw ore, primary screening, intermediate crushing, first-stage roller grinding, secondary screening, magnetic pulley waste throwing, fine ore dry separation, second-stage roller grinding, slurry making, wet screening, second-stage roller grinding, wet magnetic separation, first-stage ore grinding, dilution, first-stage magnetic separation, first-stage grading, first-stage ore grinding, concentration magnetic separation, second-stage ore grinding, second-stage magnetic separation, second-stage grading and the like. According to the invention, the traditional process of'three-section one-closed-circuit ore crushing, ultrafine crushing by a high-pressure roller mill, three-section ore grinding and three-section magnetic separation 'for treating extremely lean magnetite is optimized into the process of'two-section crushing, two-section roller milling, ball milling, vertical milling and stage magnetic separation' from the process flow; the traditional fine crushing operation is omitted, belt conveying is reduced, the amount of ore entering a mill is greatly reduced, dust generation points of a dressing plant are reduced, and the purpose of low-carbon, environment-friendly and efficient separation of extremely lean magnetite is achieved.

The invention relates to a preparation method of a multi-layer composite pellet and the pellet. The preparation method comprises the following steps: mixing hematite powder, pellet return ore powder, boric sludge powder and dolomite powder to prepare pretreated hematite powder; uniformly mixing magnetite powder and bentonite to obtain a mixture; pelletizing the mixed material; spraying atomized water and conveying the pretreated hematite powder into the pelletizer to prepare green pellets; and the green pellets are dried, preheated and roasted to produce finished pellets, and screened unqualified products are made into pellet return ore powder to return to participate in batching again. According to the method, the purpose of producing the high-quality pellets with the hematite as the main raw material is achieved, the problem that in the pellet production process, due to the fact that the proportion of the hematite is too high, the pellet index becomes poor is solved, the pellet melting dripping performance is greatly improved, and the technical problem that magnetite concentrate is mainly used for pellet production is solved; and secondary resources such as pellet return charge and boric sludge are fully utilized, so that the production cost of the pellets is reduced.

The invention belongs to the field of metallurgy, and particularly relates to a method for comprehensively recovering iron, vanadium, titanium, scandium and gallium through cooperation of vanadium titano-magnetite and red mud, which comprises the following steps: a) mixing vanadium titano-magnetite concentrate powder and red mud powder, roasting, leaching in water, and carrying out solid-liquid separation to obtain leached residues and leached liquid; b) mixing the leachate with a precipitant to precipitate vanadium, and carrying out solid-liquid separation to obtain vanadium-rich slag and vanadium-precipitated clear liquid; dissolving the vanadium-rich slag in a sulfuric acid solution, mixing the vanadium-rich slag with ammonium salt to react, carrying out solid-liquid separation, and roasting the obtained solid product ammonium polyvanadate to obtain V2O5; resin is used for adsorbing and desorbing gallium ions in the vanadium precipitation clear liquid, the pH of desorption liquid is adjusted to be alkaline, then electrolysis is conducted, and crude gallium is obtained; c) washing and drying the leaching residues to prepare pellets; after the pellets are pre-reduced, a carbonaceous reducing agent is mixed, melt separation treatment is carried out, and scandium-containing high-titanium slag and molten iron are obtained; and Ti and Sc in the scandium-containing high titanium slag are recycled. The method has the advantages of simple process, cleanness, high efficiency and the like.

The invention belongs to the technical field of ultra-lean magnetite crushing and beneficiation, and particularly provides an ultra-lean magnetite final powdering process combining a high-pressure roller mill with two-stage dry separation, which comprises the following specific steps: ultra-fine crushing, screening, first-stage dry magnetic separation and second-stage dry magnetic separation, and the ores return to the high-pressure roller mill to be crushed, the first to fourth steps are repeated, and the waste rocks are directly thrown out. According to the process, the secondary dry type magnetic separation process is added in the follow-up process of the screening process, oversize ore is subjected to secondary dry type magnetic separation and then returns to the high-pressure roller mill, the treatment principle that throwing can be carried out early, throwing can be carried out early, and collecting can be carried out early is achieved, waste rock and part of ore reaching the monomer dissociation degree are separated in advance, and the treatment capacity of the high-pressure roller mill is reduced; therefore, the problem that the treatment effect of the high-pressure roller mill final powder process on the ultra-lean magnetite is poor due to the fact that the disseminated particle size of the magnetite is not uniform is solved.

A method for comprehensive treatment of high-iron and low-silicon red mud through alkali magnetization roasting belongs to the technical field of metallurgy and comprises the following steps: (1) mixing the high-iron and low-silicon red mud, liquid caustic soda and a solid reducing agent, and granulating to obtain raw material pellets; (2) the raw material pellets are dried through kiln tail gas to remove adsorbed water and part of crystal water, and dried pellets are obtained; (3) the dried pellets are subjected to reduction roasting in an inert protective gas atmosphere in a dry roasting mode, and clinker pellets are obtained; and (4) the clinker pellets and a dilute alkali solution are subjected to wet grinding leaching and the like. According to the method, the high-iron and low-silicon red mud is supplemented with liquid caustic soda and solid reducing agents such as coal or sawdust organic matter and roasted, directional regulation and control of a red mud mineral phase are achieved, iron and aluminum resources are recycled in the form of magnetite and sodium aluminate, and the using amount of the reducing agents and the reaction temperature are remarkably reduced.

The invention discloses a sulfur-containing magnetite beneficiation method which specifically comprises the following steps: S1, raw material preparation: crushing sulfur-containing magnetite to obtain small-particle sulfur-containing magnetite; s2, physicochemical property determination: detecting the particle size of the small-particle sulfur-containing magnetite, the content of magnetite in the small-particle sulfur-containing magnetite and the content of sulfur minerals in the small-particle sulfur-containing magnetite; s3, magnetic separation: according to the physicochemical properties of the small-particle sulfur-containing magnetite detected in the step S2, automatically controlling the magnetic field intensity of a magnetic separation process through a controller, and carrying out magnetic separation to obtain magnetite and sulfur-containing ore; the magnetic field intensity of the magnetic separation process is dynamically adjusted according to the iron ore particle size of the sulfur-containing magnetite, the magnetite content in the sulfur-containing magnetite and the sulfur mineral content, the trends of iron minerals and sulfur minerals are accurately controlled, optimal adjustment of the element trends is achieved, and the recovery rate of iron and sulfur is increased.

According to the method, blast furnace return ore and limonite type laterite-nickel ore are used for stirring, important parts such as a trough front grid plate and a small ore trough grid plate are densified, hematite and magnetite are used in cooperation in low-alkalinity sintered ore production, and sintering and blast furnace positive coping adjustment operation modes and other modes are adopted, so that the defects of limonite type laterite-nickel ore sintered ore are overcome; on the basis of not influencing the quality and the yield of the sintered ore, the limonite type laterite-nickel ore is applied to the production of the sintered ore, and the monovalent advantage of the laterite-nickel ore and the benefits of the Ni element to part of steel types are fully utilized.

The invention discloses a method for enhancing biological leaching of copper in a waste circuit board by utilizing magnetite. The method comprises the following steps: adding the pre-crushed waste circuit board and magnetite into a 9K culture medium with the pH value of 1.8-2.0 according to a certain mass ratio, inoculating Acidithiobacillus ferrooxidans as a leaching strain, and carrying out a leaching reaction under a constant-temperature oscillation condition. The magnetite is added, so that the leaching of copper in the circuit board is remarkably enhanced, the leaching rate is remarkably improved, and the leaching period is shortened. And compared with the microbiological leaching result without magnetite, the copper leaching rate is improved by 12-32%. By utilizing the difference between the circuit board and the magnetite in particle size, the magnetite can be recycled from the leaching residues through a physical separation means for a new round of leaching. The method is simple in process, the strain is easy to culture, and the method has good environmental friendliness and is suitable for green and efficient recovery of copper in the waste circuit board.

The invention discloses a Mars soil simulant performance evaluation method based on spectrum-mechanics combined characterization, which comprises the following steps: acquiring surface soil chemical components and physical and mechanical reference data of a target Mars area, taking basalt, magnetite and hematite as raw materials, solving the optimal mass ratio by adopting an optimization algorithm, and preparing a sample. Then, systematic spectrum characterization is carried out on the sample, and components and spectrum characteristic data of the sample are obtained; and meanwhile, carrying out physical and mechanical property test on the sample to obtain mechanical property data. Further, spectrum and component data serve as independent variables, mechanical data serve as dependent variables, an associated data set is constructed, the influence weight is analyzed, and a component-structure-performance quantitative relation is established. And finally, based on all the data and the internal association thereof, calculating the comprehensive similarity between the simulant and the real Mars soil, and generating a comprehensive performance evaluation report. According to the method, multi-dimensional and standardized quantitative evaluation of chemical, mineral and mechanical properties of the Mars soil simulants is realized.

The invention discloses a novel method for improving air permeability of a blast furnace soft melting zone and reducing metallurgical coke consumption, and belongs to the technical field of blast furnace ironmaking. According to the method, the metallogenic properties of various gradient sintering mixtures are tested in advance before sintering cup test and sintering production by adopting a mode of combining tabletting pre-sintering and mineral phase detection, and a sintering mixture matching scheme which is more suitable for the current sintering material condition is selected. The specific technical thought is as follows: finely grinding and drying various raw and auxiliary materials; preparing a mixed material, and pressing the mixed material into a round cake; and sintering the round cake in a furnace, taking out the round cake, and naturally air-cooling the round cake. And finally, preparing a sample, detecting and analyzing the proportions of calcium ferrite, magnetite, hematite, a glass phase and pores, and evaluating the mineralization performance of the calcium ferrite, the magnetite, the hematite, the glass phase and the pores. The sintering test process is simple, the single test material consumption is extremely low, the sample preparation is convenient, parameters in the test process are stably controlled, the chemical components of the mixture are uniform, and the mineralization performance of the mixture with different mineral powder types and proportions can be accurately analyzed.