3results about How to "Improve iron grade" patented technology

The application discloses a method for preparing direct reduced iron from iron-containing raw materials with near-zero carbon, and belongs to the technical field of steel metallurgy. The method comprises the following steps: uniformly mixing iron-containing raw materials, an organic-inorganic composite binder, biomass carbon and water, and then sequentially performing high-pressure forming and drying and solidification to obtain cold briquetting; and the cold briquetting is reduced by pure hydrogen to obtain direct reduced iron. The method can prepare cold briquetting suitable for the performance requirements of a shaft furnace for direct reduction at a relatively low temperature (<300 DEG C), and further prepares direct reduced iron by pure hydrogen reduction. The method has a short process flow, near-zero carbon emission, and provides a new technical route for the green and low-carbon transformation of the steel industry.

This invention provides a microwave roasting equipment and process flow for iron extraction from red mud, relating to the field of red mud iron extraction technology. It includes a fixed base frame with a rotary kiln mounted on top. The rotary kiln comprises a furnace shell, furnace tubes, a discharge end pipe, a feeding assembly, a preheating assembly, a retention assembly, and a drive assembly. By incorporating the preheating and retention assemblies, this invention achieves effective preheating of the red mud particles, reducing the energy consumption required for roasting. Simultaneously, the retention assembly ensures uniform microwave action on the red mud particles, effectively improving the heating and roasting efficiency. The combined effect significantly reduces energy consumption during red mud roasting, and through this novel red mud iron extraction process, the iron grade of the obtained iron concentrate is greatly improved.

The invention relates to the technical field of ferrous metallurgy, in particular to a particle size grading multi-layer bubbling fluidized bed and a direct steelmaking device. The fluidized bed comprises a gas distribution chamber and a plurality of fluidized bed layers from bottom to top, at least one of the fluidized bed layers is a bubbling bed layer, and the bubbling bed layer is a conical bed; the bottom fluidized bed layer is a cooling reduction bed layer, and the gas distribution chamber is provided with a low-temperature reducing gas inlet; the middle fluidized bed layers and the top fluidized bed layer are heating reduction bed layers, the heating reduction bed layers are divided into a fine particle bed layer and a coarse particle bed layer, and the fine particle bed layer is located above the coarse particle bed layer; except for the bottom fluidized bed layer, each fluidized bed layer is provided with a discharging pipe, the bottom fine particle bed layer is provided with a fine material discharging pipe, and the bottom fluidized bed layer is at least provided with a bottom discharging pipe. The cooling reduction bed layer is arranged, the temperature of DRI powder discharged from the fluidized bed is low, the iron grade can be directly improved after magnetic separation, direct steelmaking is achieved, and carbon emission in the whole steelmaking process is greatly reduced.