Abstract Understanding the reactions taking place in hematite-oxalic acid system is important order to clean iron oxides from filters and remove mineral concentrates. Previous studies reported formation of an unwanted solid phase during this process. The objective current work, therefore, was visualize rationalize dissolution steps hematite–oxalic reaction by combining density functional theory...

Polymer concretes (PCs) were created by using varying concentrations of silica sand as aggregate and also hematite, colemanite and a commercial epoxy resin. Hematite is known to exhibit radiation shielding properties. Mechanical performance was evaluated including unit weight, pulse velocity, compressive strength, flexural strength, splitting tensile strength, modulus of elasticity and dynamic ...

Introduction: Meridiani Planum was chosen as the landing site for the Mars Exploration Rover Opportunity partially based on Mars Global Surveyor Thermal Emission Spectrometer data indicating an abundance of hematite [1]. Hematite often forms through processes that involve water, so the site was a promising one to determine whether conditions on Mars were ever suitable for life [1,2]. Opportunit...

DRI production in tunnel furnaces sometimes encounters an incomplete degree of reduction. A model is required to tackle heterogeneous reaction rates, crucible heat transfer, and oxide morphology. Herein, a three-phase proposed based on mass conservation kinetics, describe the reduction hematite magnetite crucibles. The was implemented via Fortran program using finite volume discretization, resu...

Reduction of iron ores with hydrogen is a solution to replace fossil fuels. For this reason, it important discuss previous discrepancies. Some studies suggest rate minimum respect temperature. Our research work indicates that can be avoided. Thermogravimetric isothermal reduction experiments were carried out from 600 1050 °C pure reagent ferric oxide and using tubular furnace. The morphology ch...