Iron Grains Research Articles

Growth Behavior of Iron Grains During Reduction Roasting of Fayalite

Growth Behavior of Iron Grains During Reduction Roasting of Fayalite

Iron extraction from copper slag by additive-free activation roasting-magnetic separation

Iron grain growth during deep reduction roasting is important for iron enrichment from copper slag (CS) through magnetic separation. In this work, a novel method of additive-free activation roasting, including oxidation and subsequent reduction roasting, was proposed to increase the iron grain size, then the iron was extracted by magnetic separation. The phase transformation of CS during activation roasting was studied by TG, XRD, SEM, and EDS. Results showed that the main mineral of fayalite in CS was decomposed into iron oxides and silica during oxidation roasting, and the thickness of iron oxide layer on the particle surface increased with the oxidation temperature. During reduction roasting, the CS and oxidized copper slag (OCS) were ultimately converted into metallic iron and cristobalite solid solution. In the reduced product obtained at 1150 °C, the iron grain sizes were 6.42 μm and 16.62 μm from CS and OCS-1100 °C, respectively. Furthermore, the Fe content in the magnetic concentrate was 72.86 % in the reduced product of CS while that was 87.85 % in the reduced product of OCS-1100 °C with an Fe recovery of ∼ 85 %. This study opens a new direction for iron enrichment from copper slag.

Assessment of genetically modified maize DP910521 (application GMFF-2021-2473).

Genetically modified (GM) maize DP910521 was developed to confer resistance against certain lepidopteran insect pests as well as tolerance to glufosinate herbicide; these properties were achieved by introducing the mo-pat, pmi and cry1B.34 expression cassettes. The molecular characterisation data and bioinformatic analyses did not identify issues requiring food/feed safety assessment. None of the identified differences in the agronomic/phenotypic and compositional characteristics tested between maize DP910521 and its conventional counterpart needs further assessment except for the levels of iron in grain, which do not raise safety and nutritional concerns. The GMO Panel does not identify safety concerns regarding the toxicity and allergenicity of the Cry1B.34, PAT and PMI proteins as expressed in maize DP910521. The GMO panel finds no evidence that the genetic modification impacts the overall safety of maize DP910521. In the context of this application, the consumption of food and feed from maize DP910521 does not represent a nutritional concern in humans and animals. The GMO Panel concludes that maize DP910521 is as safe as its conventional counterpart and non-GM maize varieties tested, and no post-market monitoring of food/feed is considered necessary. In the case of accidental release of maize DP910521 material into the environment, this would not raise environmental safety concerns. The post-market environmental monitoring plan and reporting intervals are in line with the intended uses of maize DP910521. The GMO Panel concludes that maize DP910521 is as safe as its conventional counterpart and the tested non-GM maize varieties with respect to potential effects on human and animal health and the environment.

Robust and effective ab initio molecular dynamics simulations on the GPU cloud infrastructure using the Schrödinger Materials Science Suite

Ab initio Born-Oppenheimer molecular dynamics (AIMD) is a valuable method for simulating physico-chemical processes of complex systems, including reactive systems, and for training machine learning models and force fields. Speed and stability issues on traditional hardware preclude routine AIMD simulations for larger systems and longer timescales. We postulate that any practically useful AIMD simulation must generate a trajectory of a minimum 1000 MD steps a day on a moderate cloud resource. In this work, we implement a computing workflow that enables routine calculations at this throughput and demonstrate results for several non-trivial atomistic dynamical systems. In particular, we have employed the GPU implementation of the Quantum ESPRESSO code which we will show increases AIMD productivity compared to the CPU version. In order to take advantage of transient servers (which are more cost and energy effective compared to the stable servers), we have implemented automatic restart/continuation of the AIMD runs within the Schrödinger Materials Science Suite. Finally, to reduce simulation size and thus reduce compute time when modeling surfaces, we have implemented a wall potential constraint. Our benchmarks using several reactive systems (lithium anode surface/solvent interface, hydrogen diffusion in an iron grain boundary) show a significant speed up when running on a GPU-enabled transient server using our updated implementation.

Differential reddening in 48 globular clusters: An end to the quest for the intracluster medium

For decades, it has been theorized that a tenuous but detectable intracluster medium should be present in globular clusters, which is continuously replenished by the gas and dust ejected by bright giants and periodically cleared by interactions with the Galactic disk. However, dedicated searches, especially in infrared and radio wavelengths, have returned mostly upper limits, which are lower than theoretical expectations by several orders of magnitude. We profited from recent wide-field photometry for 48 Galactic globular clusters to compute high-resolution maps of differential reddening, which can be used to correct any photometric catalog in these areas for reddening variations. Using 3D reddening maps from the literature, we evaluated the amount of foreground extinction. This allowed us to estimate the masses of the intracluster medium in our sample clusters, with an accuracy of one order of magnitude. Our estimates agree with the few available literature detections and with theoretical expectations. Because the discrepancy between observations and expectations only concerns literature upper limits, we explored possible reasons why they could be underestimated and we show that two recent discoveries can explain the discrepancy. The first is the recent discovery that the intracluster medium in 47 Tuc is not centrally concentrated. This is also supported by our maps, which in the majority of cases do not show a central reddening concentration. The second is the discovery that the dust in metal-poor ([Fe/H] ≲ −1 dex) globular clusters is dominated by iron grains rather than silicates, which undermines previous dust mass estimates from observed upper limits. We conclude that current evidence, including our maps, does not contradict theoretical expectations and the problem of the missing intracluster medium is no longer an issue.

Planetary Paleomagnetic Intensity Recording Fidelity Test Using a Synthetic Lava

AbstractMeteorite paleomagnetism is fundamental to understanding planetary dynamo processes and the evolution of the early Solar System. However, due to the extraterrestrial and ancient origins of meteorites, their paleomagnetic recording fidelity remains uncertain, which can be tested from a planetary sample formed in a known field. On Earth, historic lavas are used to examine paleomagnetic recording fidelity through the Thellier‐series experiment and other paleointensity methods, which can produce paleointensity estimates to test against the known field strength. But natural terrestrial rocks have different magnetic mineralogy from planetary samples, so they cannot faithfully infer the recording fidelity of meteorites. Here, we used an iron‐particle‐bearing sample from the Syracuse University Lava Project (SULP), which is analogous to the lunar basalts and howardite‐eucrite‐diogenite meteorites and forms in the present‐day Earth's field, to investigate the recording fidelity of these meteorites. No remanence has been identified in the high coercivity range with alternating field (AF) demagnetization due to the sample's low coercivity and AF noise, which produces underestimated paleointensities. Two accurate thermal paleointensities indicate that we may acquire accurate paleointensities from non‐ideal multidomain (MD) iron grains with the Thellier‐Coe and RESET methods, but the success rate is low due to the MD effect and thermal alteration in the experiments. Our results imply that MD iron‐bearing meteorites have the potential to provide accurate paleointensities that can be used to constrain planetary processes.

Effects of grain magnetic properties and grain growth on synthetic dust polarization of MHD simulations of low-mass Class 0/I YSOs

ABSTRACT Thermal dust polarization is a powerful tool to probe magnetic fields ($\boldsymbol{B}$) and grain properties. However, a systematic study of the dependence of dust polarization on grain properties in protostellar environments is not yet available. In this paper, we post-process a non-ideal MHD simulation of a collapsing protostellar core with our updated POLARIS code to study in detail the effects of iron inclusions and grain growth on thermal dust polarization. We found that superparamagnetic (SPM) grains can produce high polarization degree of $p \sim 10\!-\!40~{{\ \rm per\ cent}}$ beyond ∼500 au from the protostar because of their efficient alignment by magnetically enhanced radiative torque mechanism. The magnetic field turbulence in the envelope causes the decrease in p with increasing emission intensity I as p ∝ Iα with the slope α ∼ −0.3. But within 500 au, SPM grains tend to have inefficient internal alignment and be aligned with $\boldsymbol{B}$ by RATs only, producing lower $p \sim 1~{{\ \rm per\ cent}}$ and a steeper slope of α ∼ −0.6. For paramagnetic (PM) grains, the alignment loss of grains above $1\, {\mu \rm {m}}$ in the inner ∼200 au produces $p \lt \lt 1~{{\ \rm per\ cent}}$ and the polarization hole with α ∼ −0.9. Grain growth can increase p in the envelope for SPM grains, but cause stronger depolarization for SPM grains in the inner ∼500 au and for PM grains in the entire protostellar core. Finally, we found the increase of polarization angle dispersion function S with iron inclusions and grain growth, implying the dependence of B-field strength measured using the David–Chandrasekhar–Fermi technique on grain alignment and grain properties.

A 4,565-My-old record of the solar nebula field

Magnetic fields in protoplanetary disks are thought to play a prominent role in the formation of planetary bodies. Acting upon turbulence and angular momentum transport, they may influence the motion of solids and accretion onto the central star. By searching for the record of the solar nebula field preserved in meteorites, we aim to characterize the strength of a disk field with a spatial and temporal resolution far superior to observations of extrasolar disks. Here, we present a rock magnetic and paleomagnetic study of the andesite meteorite Erg Chech 002 (EC002). This meteorite contains submicron iron grains, expected to be very reliable magnetic recorders, and carries a stable, high-coercivity magnetization. After ruling out potential sources of magnetic contamination, we show that EC002 most likely carries an ancient thermoremanent magnetization acquired upon cooling on its parent body. Using the U-corrected Pb-Pb age of the meteorite's pyroxene as a proxy for the timing of magnetization acquisition, we estimate that EC002 recorded a field of 60 ± 18 µT at a distance of ~2 to 3 astronomical units, 2.0 ± 0.3 My after the formation of calcium-aluminum-rich inclusions. This record can only be explained if EC002 was magnetized by the field prevalent in the solar nebula. This makes EC002's record, particularly well resolved in time and space, one of the two earliest records of the solar nebula field. Such a field intensity is consistent with stellar accretion rates observed in extrasolar protoplanetary disks.

Spatially resolving the AGB star V3 in the metal-poor globular cluster 47 Tuc with VLTI/GRAVITY

Context. Mass loss at the asymptotic giant branch (AGB) plays an important role not only in the final fates of stars, but also in the chemical evolution of galaxies. Nevertheless, the metallicity effects on AGB mass loss are not yet fully understood. Aims. We present spatially resolved observations of an AGB star, V3, in the metal-poor globular cluster 47 Tuc (NGC 104). Methods. The AGB star 47 Tuc V3 was observed using the GRAVITY instrument at ESO’s Very Large Telescope Interferometer (VLTI) at 2–2.45 μm, with a projected baseline length of up to 96 m. Results. The object 47 Tuc V3 has been spatially resolved and stands as the first to attempt to spatially resolve an individual star in a globular cluster. The uniform-disk fit to the observed data results in an angular diameter of ∼0.7 mas. Our modeling of the spectral energy distribution and near-infrared interferometric GRAVITY data suggests that the observed data can be explained by an optically thin dust shell with a 0.55 μm optical depth of 0.05–0.25, consisting of metallic iron grains, likely together with effects of the extended atmosphere of the central star. The dust temperature at the inner shell boundary is 500–800 K (corresponding to 23–90 stellar radii), significantly lower than observed in nearby oxygen-rich AGB stars. Radiation pressure on small (< 0.05 μm) iron grains is not sufficient to drive stellar winds. Therefore, iron grains may grow to larger sizes, even in the metal-poor environment. Alternatively, it is possible that the observed iron grain formation is a result of the mass outflow initiated by some other mechanism(s). Conclusions. The sensitivity and angular resolution of VLTI provides a new window onto spatially resolving individual stars in metal-poor globular clusters. This allows us to improve subsequent studies of the metallicity dependence of dust formation and mass loss.

Mechanism of iron grains aggregation and growth in metalized pellet under the alternating magnetic fields

The direct reduction-magnetic separation method is highly efficient for producing metallic iron powder from low-grade complex ore resources. However, the limitation lies in the small average size of iron grains, which impedes the subsequent separation between metallic iron and gangue minerals. To address this, a novel method utilizing induction heating was introduced to stimulate the aggregation and growth of iron grains. Our study systematically investigated the growth kinetics behavior of iron grains under alternating magnetic fields. Additionally, we compared the impact of induction heating versus conventional heating on iron grain growth and delved into the mechanism through which the magnetic effect enhances the aggregation and migration of iron grains. The results indicate that iron grains can effectively aggregate and migrate to the edges of cracks or pellet surface under alternating magnetic fields, realizing the increase of average iron grain size and the pre-separation of metallic iron from gangue minerals. Specifically, the average iron grain size increased from 12.95 μm to 36.58 μm when induction heating temperature at 1300 °C for 100 min. Additionally, the total iron grade of concentrate reached 94.60% with ball milling 30 min and magnetic field intensity of 750 Gs. Finally, the growth model of iron grains under alternating magnetic fields was established and the mechanism of magnetic effect on promoting iron grains growth was revealed.

In-depth study on the synergistic conversion mechanism of iron ore with waste biochar for co-producing directly reduced iron (DRI) and syngas

Waste biochar and waste iron ore sintering dust were synergistically resourced to produce directly reduced iron (DRI) and combustible syngas in this study. A solid product with 92.45 % metallization ratio and a combustible syngas (65.69 % CO, 8.03 % CH4) with a yield of 1170.9 ml/g were obtained at 1000 °C for 60 min with 1.2 mol(C/Fe). The CO production of biochar conversion was increased by adding iron ore sintering dust, about 769.3 mL/g at 1000 °C for 60 min, 7.17 times that of biochar pyrolysis alone (107.3 mL/g). The co-conversion was the generation, growth and aggregation of iron grains for the sintering dust. This synergistic conversion achieved the recycling of these two solid waste resources to produce high-value DRI and high-calorific-value syngas, as industrial raw materials and fuels, saving fossil resources and fuels. The biochar pyrolysis, gasification and the reconversion of pyrolysis products occurred during their co-conversion. The gas production of biochar pyrolysis and gasification were 280.7 ml/g and 933.8 ml/g, while the reduction degrees of iron ore by the gas and solid from biochar pyrolysis were 12.64 % and 79.98 %. Their well-mixed state during the co-conversion process facilitated the reconversions of pyrolysis products by improving diffusion efficiency.

EFFECT OF FILLER CONTENT AND SIZE ON THE FLEXURAL STRENGTH AND HARDNESS OF PURE IRON POWDER FILLED LAMINATED FIBERGLASS EPOXY COMPOSITES

The aim of this work is to evaluate the effect of the amount of pure iron powder (99.9987%), introduced as a filler in a glass-epoxy composite laminate, as well as the variation of its grain dimensions, on its flexure strength and hardness. Contact molding was used to produce laminate plates of 15, 20, and 25% of weight content with three different dimensions 92, 64, and 32 μm, and the fiberglass content was set at 30%. For the bending test, the specimens were prepared according to ISO 14125 standard specification, the test was carried out with three different speeds, and the required number of specimens were manufactured according to Taguchi's orthogonal array L9 (3 × 3) by varying three parameters (iron powder content, grain size, and test speed). The results were studied with the Taguchi method; however, the hardness was measured on plates with the same iron powder content while varying the dimensions of its grains (92, 64, and 32 μm). The results show that the pure iron powder content and dimension variations have a direct and clear influence on the composite material's mechanical characteristics, in such a way that: a specific percentage of filler and grains size reduction could widely increase the hardness as well as the material flexure strength. The results of the elaborated composite material's bending test were compared to a 45% glass-epoxy laminate. Whereas the hardness of the elaborated laminate was compared to a resin plate and the 45% glass-epoxy laminate.

Synergistic conversion of iron ore sintering dust and waste biochar to produce direct reduction iron and syngas: Gasification, reduction behavior and thermodynamic analysis

Waste biochar from biomass power generation and sintering dust from ferrous metallurgy were skillfully used to produce direct reduced iron (DRI) and syngas via a synergetic conversion in this study. The thermodynamic analysis of their related reactions, biochar conversion and reduction behavior of sintering dust were investigated. The biochar gasification and reduction of sintering dust were coupled and promoted by each other at 1000 °C for 60 min with 1.2 mol (C/Fe). For biochar conversion, adding sintering dust deepened the pyrolysis of the volatiles in the waste biochar to generate more CH4, and it provided more oxygen atoms, gasifying carbon atoms in the fixed carbon to generate more CO. The CO and CH4 yield from biochar conversion with iron oxides of sintering dust increased by 633.8% and 41.5% to its pyrolysis alone. For the reduction of sintering dust, the whole conversion process of sintering dust was the generation, aggregation and growth of the iron grains, including the generation of metallic iron grains, forming curved bars and composite flocculent metallic iron, and its larger lumps particles finally. A DRI with a 92.4% metallization ratio, meeting the requirements of the subsequent electric arc furnaces, was obtained at 1000 °C for 60 min with 1.2 mol (C/Fe). This study achieves an efficient and reciprocal conversion of these two solid waste resources. It offers an essential research reference for fuel gasification and DRI processes.

Effects of Na2CO3 on the carbothermic reduction and magnetic separation of ilmenite concentrate

Ilmenite concentrates are the raw material used for the production of titania pigment and metallic titanium. This work studies the effect of the addition of Na2CO3 in direct carbothermic reduction of ilmenite concentrate to enhance the separation of metallic iron from titanium components. The effects of temperature, Na2CO3 content and C/O molar ratio on the mineral phases, metallization degree of iron, and iron grain size of the reduced product are evaluated. The optimal conditions for the direct reduction of ilmenite concentrate are 1300 °C, a C/O molar ratio of 1.1, and 5 wt% Na2CO3. Under these optimal reduction conditions, the metallization of iron reaches the maximum of 96.8%, and the average iron grain size is 20.1 μm. After grinding and magnetic separation, the direct reduced iron product (magnetic component) contains 93.9 wt% of iron and 4.66 wt% of TiO2, with an iron recovery of 93.9%, while the non-magnetic product contains 69.9 wt% of TiO2 and 7.61 wt% of iron, with a TiO2 recovery of 93.5%. The results show that an appropriate amount of Na2CO3 effectively promotes the reduction of ilmenite. However, excessive Na2CO3 adversely affects ilmenite reduction. The phase transition patterns of Na2CO3 in the direct reduction of ilmenite is investigated.

Effect of spraying iron, zinc and using superabsorbent on grain yield and some biochemical properties of maize under drought stress

Nutrients such as iron and zinc play a vital role in controlling the negative effects of drought stress through the synthesis of enzymes, maintenance of cell membrane, and activation of antioxidant defense system. Due to these biochemical properties, an experiment was conducted to evaluate effect of spraying iron, zinc and using superabsorbent on grain yield and some of biochemical properties of maize under drought stress in a randomized complete block design in Shooshtar city during the years 2017–2018. The experimental treatments included three levels of drought stress (Irrigation after 30%, 40% and 50% evaporation). Sub-plots consisted of superabsorbent polymer at two levels (control and 200 kg/ha) and combination of iron and zinc (control, iron, zinc, and iron-zinc). The results showed that drought stress affected chlorophyll, proline, iron grain concentration, nitrogen percent, grain protein and grain yield. Drought stress caused a significant reduction in yield. The percentage of grain protein was significantly increased in irrigation treatment at 50% of farming capacity. The highest grain yield and chlorophyll index was observed in 30% irrigation treatment. Spraying iron and zinc significantly increased the grain yield, chlorophyll index, iron, and zinc concentrations. Furthermore, drought stress and superabsorbent interacted significantly on grain yield. The interaction among drought stress and superabsorbent elements had significant effects on zinc and iron concentration. The present study suggests that using 200 kg/ha superabsorbent polymer and spraying iron and zinc under the 40% post-discharge irrigation may improve grain yield and biochemical features of maize.

ANALYSIS AND DIMENSIONING OF THE FUEL SUPPLY SYSTEM OF BULK-CARRIER

"In the context of the global oil crisis, in all fields, an optimization of fuel consumption and an improvement of the efficiency of energy installations are being attempted. Thus, the shipping and transport industry is converging towards this idea by implementing energy installations with increased yields and reduced consumption. At the same time, for this purpose, it is also tried to increase the efficiency through the appropriate preparation of the fuel or its burning in optimal conditions. Thus, in this context, the chosen topic aims to deal with aspects related to the dimensioning of the fuel supply system for a 178,000 tdw universal Bulk-Carrier. The ship is propelled by a B&W 8L60MC main engine that has been modernized in order to reduce consumption, noxious emissions and increase the energy efficiency index. Bulk-Carrier ships are intended for the transport of various goods in bulk: iron ore, grain, coal, phosphates and other similar goods. "

Polarized microwave emission from space particles in the upper atmosphere of the Earth

ABSTRACT Tons of space particles enter the Earth atmosphere every year, being detected when they produce fireballs, meteor showers, or when they impact the Earth surface. Particle detection in the showers could also be attempted from space using satellites in low Earth orbit. Measuring the polarization would provide extra crucial information on the dominant alignment mechanisms and the properties of the meteor families. In this article, we evaluate the expected signal to aid in the design of space probes for this purpose. We have used the radmc-3d code to simulate the polarized microwave emission of aligned dust particles with different compositions: silicates, carbonates, and irons. We have assumed a constant spatial particle density distribution of 0.22 cm−3, based on particle density measurements carried during meteor showers. Four different grain size distributions with power indices ranging from −3.5 to −2.0 and dust particles with radius ranging from 0.01 $\mathrm{\mu }$m to 1 cm have been considered for the simulations. Silicates and carbonates align their minor axis with the direction of the solar radiation field; during the flight time into the Earth atmosphere, iron grains get oriented with the Earth’s magnetic field depending on their size. Alignment direction is reflected in the Q-Stokes parameter and in the polarization variation along the orbit. Polarization depends on the composition and on the size distribution of the particles. The simulations show that some specific particle populations might be detectable even with a small probe equipped with high-sensitivity, photon-counting microwave detectors operating in low Earth orbit.

First-principles study on the corrosion resistance of iron oxide surface and grain boundary in austenitic steel to lead–bismuth eutectic

In this paper, the corrosion properties of austenitic steel with and without protection of Fe3O4 scale was investigated based on first-principles calculations. The results show that lead–bismuth eutectic (LBE) is only adsorbed at some local positions on Fe3O4 scale, but is stably adsorbed at various sites on the Fe surface. The adsorption of LBE reduces the escape energy of Fe on Fe3O4 scale and pure Fe surface, and pure Fe surface is more susceptible to LBE corrosion. Moreover, the interaction between common alloying elements (Ni, Cu, Mo, Mn, Cr, Nb, V, Si, and Al) and oxygen atoms are investigated. Among them, Ni and Cu are weakly bound to O and most prone to escape from the Fe3O4 scale. Mo, Mn, and Cr have a significant escape tendency, while Nb, V, Si, and Al are not susceptible to escape. LBE will embrittle the grain boundary (GB) under failure of oxide layer. Ti, Cr and Ni all improve the strength of the GB structure, but the strengthening effect is limited, and GB embrittlement is dominated by Pb and Bi.

Surface nanocrystallization of pure iron achieved by anodization-reduction treatment and its effect on lower-temperature nitriding behaviors

In this work, a novel method named anodization-reduction composite treatment was designed to achieve surface nanocrystallization on pure iron materials. Subsequently, this method was employed as pretreatment for gas nitriding of pure iron and its effect was studied systematically. The experimental data illustrated that a 1.3 μm thick Fe2O3 layer with nanoporous structure was successfully fabricated by anodization treatment in solutions containing 0.1 M NH4F and 1 M H2O. After hydrogen reduction at 400 °C, the nanoporous Fe2O3 layer was transformed to pure layer with nanoparticles stacked structure. Additionally, each particle is composed of several pure iron grains with size of 2–10 nm. After lower-temperature gas nitriding at 400 °C, a dense compound layer composed of Fe3N and Fe4N phases with thickness of 3 μm was formed on surface of anodization-reduced sample. The anodization-reduced nitrided sample show the higher hardness, lower friction coefficient and improved wear resistance than those of original nitrided sample. The acceleration of nitriding process may be attributed to the increased adsorption area of nitrogen atoms, rapid diffusion effect in nanocrystalline and more nucleation sites for nitrides. This paper provides a novel surface nanocrystallization method for iron to reduce its nitriding temperature or duration.

Loading of zinc and iron in grains of different wheat genotypes in the calcareous and floodplain soils of Bangladesh

Major malnutrition in Bangladesh is zinc (Zn) and iron (Fe) deficiency as most people commonly depend on cereals, chiefly rice and wheat. The main objectives are to enhance Zn and Fe concentrations through the use of selected varieties and the application of respective fertilizers. Field experiments were conducted at Bangladesh Agricultural University (BAU) farm, Mymensingh (AEZ 9, non-calcareous soil) and at Bangladesh Institute of Nuclear Agriculture (BINA) substation, Ishwardi (AEZ 11, calcareous soil) for two consecutive wheat seasons (2014–15 and 2015–16) with 10 varieties and 15 advanced lines. Varieties BARI Gom 25, 27, 28 & 29 and breeding lines Vijay, HPYT-5, 15 & 21 and BL-1883 have been recognized as Zn-enriched wheat varieties (24–30 μg g−1). Among the genotypes, Zn further increased by 4–8 μg g−1 due to Zn fertilization. Concerning Fe-enriched wheat genotypes (24–30 μg g−1), five varieties viz. Shatabdi, Prodip, BARI Gom 25 & 28 and Sufi, and four lines such as HPYT-12, BL-1883, BL-1040 and Fery-60 have been identified. The grain Fe concentration of wheat genotypes increased when Fe was added, the increment being 6–12 μg g−1. A positive relationship between Zn and N is observed with increased protein content. The grain yield of wheat was increased by 3.8–25.7% due to Zn application over the varieties and locations but Fe addition had no effect. The result of the current study showed that a potential breeding line with appropriate fertilization can improve Zn and Fe levels in wheat grain, without incurring loss to wheat yield.