A method of treating an offgas includes purifying the offgas to remove particulate matter, water, undesirable gaseous components and inert gases to produce a dried carbon oxide gas feedstock, and converting at least a portion of carbon oxides in the dried carbon oxide gas feedstock into solid carbon. In other embodiments, a method includes passing a dried carbon oxide gas feedstock through a multi-stage catalytic converter. A first stage is configured to catalyze methane-reforming reactions to convert methane into carbon dioxide, carbon monoxide and hydrogen with residual methane. A second stage is configured to catalyze the Bosch reaction and convert carbon oxides and hydrogen to solid carbon and water.

The invention relates to a control method for a secondary dust removal system in which a pipe network connects an induced draft fan to at least two suction points. The pipe network comprises a controllable exhaust air flap for each suction point, the position of said flap influencing the volumetric flow rate at the suction point. A mathematical model of the pipe network allows the method to energy-efficiently control the exhaust air flaps and the induced draft fan.

Disclosed herein, in some aspects, are systems and methods for producing a material comprising iron through self-reduction of iron ore using bio-oil and/or other reducing agents (e.g., bio-based reducing agents), such as biocrude, ethanol, or other bio-based liquids or biologically sourced liquids. The bio-oil and/or other reducing agents can be mixed with the iron ore to form a furnace mixture, which can be heated, such that the components of the bio-oil and/or other reducing agents in the furnace mixture reduce the iron ore to form an iron product (e.g., a material that includes metallic iron). In some cases, the pre-formed furnace mixture allows for the reducing agents to interact with the iron more readily, thereby providing for quicker reaction rates, and thereby quicker reduction of iron ore, as compared to direct reduction iron production.

Metallurgical plant (10) for treating steelworks by-products, comprising at least one smelting furnace (11) configured to reduce and smelt the reducible metal oxides present in the by-products, generating fumes (F), and an apparatus (12) associated with the smelting furnace (11) to treat said fumes (F). In particular, the apparatus (12) comprises static means for extracting and separating zinc oxide (ZnO) from the fumes (F).

The present invention pertains to the field of steel smelting, specifically to a method for steel production in a blast furnace and a converter based on carbon cycling. The method comprises the following steps: 1. Smelting iron in a blast furnace to obtain molten iron; 2. Introducing the aforementioned molten iron into a converter and carrying out steel refining within the converter to obtain molten steel and untreated converter gas; 3. Subjecting the untreated converter gas to pressurisation, deoxygenation, dehydration, and decarbonisation treatments to obtain synthesis gas and treated converter gas; 4. Recycling the treated converter gas back into the blast furnace to regulate the ratio of reductive gases within the furnace atmosphere.

Beneficial Effects: The method enables the cyclic utilisation of converter gas. By decarbonising the converter gas and recycling it back into the blast furnace, the content of reductive gases in the furnace atmosphere is enhanced. This promotes indirect reduction within the blast furnace while decreasing direct reduction, thereby reducing the consumption of carbonaceous fuel during the blast furnace iron smelting process and effectively lowering CO2 emissions.

A steel making plant includes an electric arc furnace and a fume collection and treatment system. The system includes a first primary suction line fluidically connected to the electric arc furnace to suck fumes generated in the electric arc furnace. A secondary suction line is for ventilating the environment surrounding the electric arc furnace by a suction hood. A filtration apparatus is for filtering emissions collected by the fume collection and treatment system before they are discharged into the atmosphere. The electric arc furnace is powered by a continuous charging system. A fume cooling apparatus, a dust collecting device and a denox selective catalytic reduction apparatus are arranged in sequence along the first primary suction line, starting from the electric arc furnace. The secondary suction line flows into the first primary suction line downstream of the denox selective catalytic reduction apparatus and upstream of the filtration apparatus.