149 results about "Hematite" patented technology

The invention belongs to the field of biochar adsorbing materials, and relates to a method for preparing modified biochar with aquatic plant waste and hematite. The method includes the following steps: (1) naturally drying aquatic plants prior to crushing to obtain aquatic plant powder; (2) crushing the hematite to obtain hematite powder; (3) weighing the hematite powder prior to putting the hematite powder into deionized water, and performing ultrasonic treatment to obtain suspension; (4) weighing the aquatic plant powder, soaking the aquatic plant powder in the suspension, and stirring and drying to obtain fully mixed aquatic plant and hematite mixture; (5) weighing the fully mixed aquatic plant and hematite mixture, putting the mixture in a batch-type atmosphere furnace, and feeding nitrogen into the furnace; performing temperature programming to the target temperature, and maintaining final-temperature pyrolysis; after the pyrolysis process is finished, obtaining the target product, namely the modified biochar. The modified biochar has strong adsorbability in nitrate and phosphate, high in stability and reusable.

The invention relates to the technical field of mineralogy, in particular to a complex iron mineral distinguishing and quantifying method and an iron mineral content analysis method, which innovatively combines chemical dissolution, automatic mineralogy analysis and a micro-area magnetic verification technology to realize distinguishing and quantifying of complex iron minerals. According to the analysis method, a closed and mutual verification analysis system is formed, acid treatment of carbonate, automatic mineralogy analysis of residual minerals, micro-area magnetic verification correction of misjudgment of maghemite, element surface scanning verification of mineralogy total quantification accuracy and a final calculation result, and closed verification of the total iron content of chemical analysis are combined, and therefore the comprehensive performance of the magnetic separation system is improved. The reliability of a final result is ensured and standardized popularization and application are facilitated.

The invention aims to provide an inhibitor for reverse flotation of micro-fine-particle hematite and a use method of the inhibitor, aiming at the problem that the micro-fine-particle hematite cannot be effectively inhibited by an existing iron ore reverse flotation process technology. According to the inhibitor, AMPS (2-acrylamido-2-methylpropanesulfonic acid) is subjected to chemical modification in a weakly alkaline solution, a product AMPS (OH <->) is generated, then in hematite flotation operation, the hydrophilicity of micro-fine particle hematite is improved, the flotation performance difference of hematite and silicate minerals is effectively increased, and efficient removal of the silicate minerals is facilitated. In addition, the modified inhibitor AMPS (OH <->) has the characteristics of strong selectivity, small dosage, simple preparation and the like, and can effectively reduce the content of silicon in the flotation concentrate of the micro-fine particle hematite, improve the yield and the recovery rate of the flotation concentrate and realize the target of efficient impurity removal of the micro-fine particle disseminated hematite.

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 discloses a high-aluminum limonite and specularite ore blending and sintering method which comprises the following steps: 1) preparing primary pre-blending powder: pre-blending high-aluminum limonite, specularite concentrate powder, iron oxide scale, limestone powder and anthracite powder to prepare the primary pre-blending powder with the water content of 6.5-7%; (2) preparing a uniformly mixed material: blending the primary pre-blended material powder obtained in the step (1) with high-silicon iron ore powder and hematite and limonite powder to prepare the uniformly mixed material; 3) sintering and burdening: burdening the uniformly mixed material obtained in the step 2) with limestone, dolomite powder, quicklime, solid fuel and return mine, and 4) controlling the components of the sintered ore as follows: 2.3-2.5% of Al2O3, 5.7-6.5% of SiO2, 8-8.5% of FeO and 1.85-2.5% of MgO. According to the invention, while 20-30% of the proportion of the discount ore silk road powder in the total uniformly mixed material is increased, the sintering cost is reduced by 20-42 yuan / ton, the drum strength of the sintered ore is greater than or equal to 78.5%, the return mine rate is less than or equal to 27%, and the RDI + 3.15 mm is greater than or equal to 63%.

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 belongs to the technical field of hematite ore mining, and particularly discloses a hematite ore particle strong magnetic separation device which comprises a screening cylinder, a hopper is fixed to the top of the screening cylinder, the top of the screening cylinder is closed, and a conical material guide block is arranged at the position, close to the bottom edge, in the screening cylinder. A plurality of supporting rods are fixed to the outer surface of the conical material guide block in the circumferential direction at equal intervals, one ends of the multiple supporting rods are correspondingly fixed to the inner wall of the screening barrel, and an electromagnetic screening device for screening iron ore particles is arranged on the conical material guide block. A supply device for conveying iron ore particles is arranged at the position, close to the top edge, in the screening barrel, and a plurality of auxiliary devices are arranged in the conical material guide block; according to the hematite detritus collecting device, by arranging the supply device, the electromagnetic screening device and the auxiliary device, crushed hematite detritus with the high iron content can be collected, and detritus blocks or hematite detritus blocks with the extremely low iron content can be screened out.

A magnetite-hematite micro-fine refractory iron ore separation method, comprising the specific steps: 1) performing crushing and screening on micro-fine-particle magnetite-hematite mixed raw iron ore and performing grinding and screening on same to obtain an ore grinding product; 2) performing weak magnetic and strong magnetic grading operation on the ore grinding product to obtain magnetic separation concentrate and magnetic separation tailings; 3) performing nanobubble pretreatment on a flotation reagent and then adding the pretreated flotation reagent to the magnetic separation concentrate to obtain the flotation feed mineral slurry; and 4) performing ultrasonic pretreatment on the flotation ore feeding slurry, and then performing reverse flotation closed-loop operation to obtain reverse flotation concentrate and reverse flotation tailings.

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.

The invention discloses a preparation method of high-silicon high-hematite limonite pellets, and belongs to the field of blast furnace burden, and the preparation method specifically comprises the following steps: step A, carrying out primary batching, drying and wet grinding on concentrate powder, Kara concentrate powder, Brazil concentrate powder, laterite-nickel ore, red mud iron powder and boron-magnesium concentrate powder in proportion; step B, proportionally adding bentonite into the wet-ground material in the step A, and carrying out secondary batching; step C, conveying the materials in the step B into a vertical mixer for strong mixing; step D, conveying the mixed material to a pelletizing chamber for pelletizing; and E, the green pellets are conveyed to a roasting cooling system to be prepared into finished pellets. According to the pellet prepared through the method, the adding amount of bentonite is reduced, the cost is reduced, the compressive strength of the finished pellet can reach 2500N / P or above, the green pellet drop strength, the compressive strength and the dry pellet compressive strength are far higher than those of on-site pellets, and the production requirement can be met.

According to the iron ore alkali dissolution-electrolysis intelligent collaborative optimization system and the dynamic purification method provided by the invention, artificial intelligence and a metallurgical process are fused, and full-process dynamic regulation and control are realized. The system comprises: 1, an intelligent collaborative optimization module, which dynamically and collaboratively optimizes dissolution-electrolysis process parameters (NaOH concentration, liquid-solid ratio, Fe < 3 + > concentration and current density) based on reinforcement learning (DQN algorithm), predicts an impurity dissolution trend and adds a specific inhibitor in a gradient manner in combination with machine learning, and inhibits generation of Al2O3 / SiO2; the equipment health management module realizes corrosion / blockage two-factor accurate early warning (the accuracy is greater than or equal to 92%) through deep learning analysis of a corrosion image and a vibration spectrum, and is linked with a maintenance decision; the energy-resource coupling module integrates waste heat recovery (greater than or equal to 85%) and a multi-effect evaporation regeneration technology, so that the energy consumption per ton of iron is reduced to 2.9 GJ, and the alkali consumption is less than or equal to 0.95 kg; and 4, a self-adaptive process platform: dynamically updating the model based on a federated learning framework, and adapting to a complex ore source with Fe greater than or equal to 35% and Al2O3 less than or equal to 8%. The embodiment verifies that the system improves the hematite dissolution rate to 94%, reduces the non-planned shutdown of equipment by 40%, reduces the comprehensive cost by 14%, and is suitable for efficient and clean utilization of low-grade iron ores.

The invention relates to a silica ore dressing method which comprises the following steps: step 1, crushing raw ore of silica ore, step 2, grinding the crushed silica ore by adopting a ball mill, step 3, carrying out graded desliming treatment on the ground silica ore by using a hydrocyclone, step 4, carrying out weak magnetic separation on the deslimed silica ore, and step 5, carrying out magnetic separation on the deslimed silica ore. And 5, the non-magnetic material subjected to weak magnetic separation is subjected to strong magnetic separation, and silica concentrate is obtained. Before the ore is subjected to strong magnetic separation, strong magnetic minerals are removed through weak magnetic pre-separation, the strong magnetic separator is effectively prevented from being blocked, the operation stability and the production continuity of equipment are improved, various magnetic impurity minerals including intergrowth particles can be removed to the maximum extent through the whole technological process, and the production efficiency is improved. Such as hematite, limonite, biotite, ilmenite, pyrite and garnet.

The invention relates to the technical field of red mud recycling, in particular to a method for improving magnetic separation iron extraction efficiency by modifying red mud through industrial kiln tail gas CO2. The invention discloses a method for improving magnetic separation iron extraction efficiency by using industrial kiln tail gas CO2 modified red mud, which comprises the following steps: collecting tail gas discharged in the calcining process of an industrial kiln, and sequentially carrying out dust removal, desulfurization and compression to obtain compressed tail gas; the method comprises the following steps: mixing red mud with water, introducing compressed tail gas, and carrying out carbonization reaction at 60-80 DEG C to obtain carbonized modified red mud slurry; and the carbonized modified red mud slurry is placed in a high-gradient magnetic separator for magnetic separation, and refined iron powder is obtained. By means of the method, resource utilization of industrial kiln tail gas CO2 and efficient quality improvement of the red mud can be achieved, a dense alkali film wrapping hematite in the red mud is stripped, the hematite crystal structure is optimized, and meanwhile the iron extraction cost of the red mud and carbon emission of an industrial kiln are reduced.

[Problem] To provide a method for producing cementite, capable of suppressing carbon precipitation and stably producing cementite over a long period of time. [Solution] Hematite (Fe2O3) is put into a reactor as an iron oxide serving as an iron source, and a carbonized gas formed from a mixed gas of carbon monoxide and carbon dioxide is supplied to the reactor. Cementite (Fe3C) can be efficiently produced for a long period of time without precipitating carbon by adjusting the carbon activity so that ac = 1 to 10 and subjecting the carbonized gas and hematite to a reduction reaction.

The invention discloses a method for preparing fluxed oxidized pellets based on hematite, and aims to solve the technical bottlenecks that high-proportion hematite pellets are difficult to grind and settle, high in roasting energy consumption and low in strength. The method comprises the following three core processes: S1, raw material pretreatment: performing wet ball milling, polyacrylamide-assisted sedimentation and ceramic vacuum filtration on coarse-grain hematite powder of which the particle size is less than 10mm, uniformly mixing with magnetite concentrate, and performing high-pressure roller milling treatment; s2, green pellets are prepared, specifically, the iron ore mixture is evenly mixed with bentonite, a calcium ferrite additive and a limestone flux, and qualified green pellets are prepared through a disc pelletizer; and S3, pellet roasting is conducted, specifically, green pellets are subjected to segmented drying, preheating and roasting in a chain grate-rotary kiln, and a finished product is obtained. According to the invention, the hematite with abundant reserves is used as a main raw material, and the compressive strength of the prepared oxidized pellets is more than 2500N / piece, the drum strength is more than 93%, the wear resistance index is less than 5%, and the prepared oxidized pellets have the cost advantage and the environmental protection benefit, and meet the high-efficiency smelting requirement of a blast furnace.

The present application relates to the technical field of mineral processing, and particularly relates to a modified dodecylamine collector, a preparation method and application thereof.The preparation method of the modified dodecylamine collector provided by the present application comprises the following steps: carrying out glow discharge air plasma treatment on dodecylamine by taking air as a working gas.The present application introduces oxygen-containing and / or nitrogen-containing active groups on the surface of dodecylamine molecules by means of glow discharge air plasma modification of dodecylamine, and the dodecylamine is used for flotation separation of quartz and hematite, so that the adsorption capacity and selectivity of the dodecylamine to quartz, especially fine quartz, are enhanced, and efficient separation of quartz and hematite can be realized at a lower dosage; and the raw material of the preparation method is green and environmentally friendly, the modification process is low-temperature, safe and controllable, no by-product is generated, and the energy consumption is low.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, and at least one clay matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, characterized in that said material has a specific surface area greater than 1 m² / g and less than 50 m² / g, and said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The invention relates to the technical field of metallurgical solid waste resource utilization, in particular to a method for enriching iron in vanadium extraction tailings and spiral separation equipment, and the method comprises the following steps: pretreatment, crushing and screening: feeding the vanadium extraction tailings into a jaw crusher for coarse crushing until the particle size is less than or equal to 50mm; the particle size of a crushed product is controlled to be smaller than or equal to 10 mm, the fine crushed product is screened through a linear vibrating screen, the size of a screen hole is 2 mm, oversize products return to the impact crusher to be crushed again, undersize products enter the next step, large gangue and impurities in the tailings can be removed in the step, and energy consumption is reduced for follow-up ore grinding operation. The combined technological process of pretreatment, magnetic separation roughing, spiral gravity separation and magnetic separation concentration is adopted, strong magnetic minerals are rapidly recovered through magnetic separation, then spiral gravity separation is adopted for weak magnetic and intergrowth minerals, the advantages of different separation technologies are fully played, and the problem that the recovery rate of the weak magnetic minerals such as hematite is low through a single magnetic separation method is solved.

The present invention proposes a hydrogen-based magnetization reduction process for hematite ore, belonging to the field of metallurgy technology, comprising: 1) generating saturated high-temperature gas; 2) mixing the temperature within the saturated high-temperature gas; 3) causing the saturated high-temperature gas to collide countercurrently with powdered hematite ore in a rotary kiln, the saturated high-temperature gas transferring heat to the powdered hematite ore and a reducing agent, causing the reducing agent to pyrolyze at high temperature to produce a large amount of reducing hydrogen gas, which penetrates into the powdered hematite ore layer and undergoes a hydrogen-based magnetization reduction reaction with the powdered hematite ore, thereby magnetizing the powdered hematite ore. The present invention provides sufficient time for the temperature to transfer from the surface of the iron ore particles to the core of the iron ore particles, thereby avoiding the phenomenon of "ringing" in the rotary kiln caused by the instantaneous excessive temperature of the iron ore surface and the inability to transfer the temperature to the core of the iron ore particles in a timely manner.

The invention belongs to the technical field of hematite ore mining, and particularly discloses a hematite ore particle impurity wet separation device which comprises a fixed cylinder, a mounting flange ring is arranged on the outer surface, close to the top edge, of the fixed cylinder, a charging barrel is arranged in the fixed cylinder, and an annular ring is fixed to the bottom, close to the outer surface edge, of the charging barrel. A plurality of on-off control devices are arranged in the annular ring; by arranging the on-off control device, the pressing and positioning assembly and the driving assembly, in the impurity separation process of the hematite ore fragments containing impurities, gas can be gradually supplied into the hematite ore fragments to form bubbles, and the bubbles impact the concave-convex parts of the outer surfaces of the hematite ore fragments, so that the impurities in the hematite ore fragments are separated, and the impurities in the hematite ore fragments are separated. Furthermore, impurities attached to the concave-convex parts can be removed, and a mixed solution is formed between the impurities and water flow, so that the purposes of removing the impurities on the hematite ore fragments and cleaning the hematite ore fragments are achieved.

The invention relates to a magnetic material comprising at least iron, in metallic form and / or in oxide form, and at least an alumina oxide matrix, the iron content being between 15% and 70% by weight as element iron relative to the total weight of said material, characterized in that said material has a specific surface area greater than 50 m² / g and less than 300 m² / g, said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.