Method for the separation of Zinc and Iron from electric arc furnace baghouse dust Provided are new and improved novel processes and continuous ion exchange/continuous ion chromatography (CIX/CIC) systems for the separation of iron and zinc from electric arc furnace baghouse dust.

Some implementations provide an integrated system that includes: a wastewater treatment system configured to process wastewater released by one or more furnaces at a steelmaking plant, and generates reused wastewater using the wastewater; a heat recovery apparatus configured to utilize exhaust gas from the one or more furnaces at the steelmaking plant, and heat the reused wastewater generated by the wastewater treatment system above a threshold temperature; and a generator configured to receive, through a water inlet, the reused wastewater heated above the threshold temperature; and an absorption system arranged in circulation with the generator, and wherein the reused water is supplied above a threshold amount such that the generator drives the absorption system and produces cooled air inside the steelmaking plant.

A process for heating a metal feedstock (31) fed in continuous to a smelting furnace (30) through a second horizontal heating section (34) through which hot discharge fumes collected from said furnace (30) pass, said fumes exerting a heating phase of said feedstock (31), characterized in that, immediately before entering said second heating section (34), the feedstock (31) is subjected to a preheating phase by heating means other than the discharge fumes collected from the smelting furnace (30). In a plant for the embodiment of said process, said different heating means are envisaged inside a first preheating section (33), which is operatively connected with said second heating section (34) by means of an intermediate fume evacuation section (35), the fumes coming from said sections (33) and (34) being conveyed to said section. Said sections (33, 34) preferably have a tunnel configuration.

Described is a device for recovering heat and fumes from slag resulting from the steel production cycle which allows the heat emitted by the slag during the cooling to be used without the need to collect the slag in tubs which must then be transported to the cooling surface and tipped in order to discharge the slag; at the same time, this device allows the fumes and consequently the heat and the pollutants which the slag emits during the tipping and the time on the cooling surface to be conveyed and treated.

Apparatus for continuously conveying and pre-heating a metal charge inside a container of a melting plant, includes at least a channel for conveying the metal charge, at least a hood disposed above the conveyor channel defining a tunnel and/or an expansion chamber, inside which at least part of the fumes exiting from the container advance, and apertures made in cooperation with lateral walls of the conveyor channel to discharge the fumes. The conveyor channel includes an activator that divert the fumes and/or delimit the zone occupied by the metal charge of the conveyor channel, and that cooperate longitudinally with at least part of the conveyor channel.

An arrangement (10) for preventing egress of a gas from a first opening of a vessel, the vessel including at least one other opening through which the gas can leave the vessel, the arrangement comprising an open passage (48) extending substantially around the first opening, the open passage (48) receiving a flow of gas such that the flow of gas leaves the open passage and flows towards and into the vessel to cause a gas from the environment external to the vessel to be drawn into the vessel. The arrangement may comprise a Coanda surface. The arrangement may be in the form of an inert for placement in the opening to the furnace.

A furnace damper control system including a furnace having at least one opening through which electromagnetic radiation from within the furnace may be sensed, an exhaust duct capable of receiving an exhaust gas stream emerging from the furnace, and a controllable damper capable of adjusting the pressure in the exhaust duct. A sensor is capable of sensing electromagnetic radiation through one or more of the openings of the furnace and generating a sensor signal corresponding to the electromagnetic radiation, and a processor is capable of processing the sensor signal and generating a monitoring signal responsive to a parameter of the electromagnetic radiation indicative of furnace emissions. A controller is capable of controlling the damper responsive to the monitoring signal indicative of the furnace emissions.

A process and plant for preheating a metal charge fed in continuous to an electric melting furnace through a preheating tunnel provided with side walls, a vault and a horizontal conveyor, wherein the metal charge is enveloped in countercurrent by fumes or exhaust gases exiting from the electric melting furnace, includes causing an air intake from the surrounding environment through openings along the preheating tunnel to complete the combustion of the fumes or exhaust gases. The intake is regulated by acting on suction fans and/or on the openings, based on measurements by temperature sensors and/or the composition of the outgoing gases in or downstream of the terminal part of the tunnel. The metal charge is enveloped by jets of gas ejected through a plurality of nozzles arranged non-uniformly longitudinally on the vault of the tunnel, with a greater concentration on the top of the vault of the tunnel.

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).

A slag foaming system for an electric arc furnace utilizing algae is described. The algae may be dried algae in particle form that is injected into the electric arc furnace through a solids injector and may be directed into the slag. Other slag foaming compositions may also be injected into a furnace as a function of furnace parameters to create slag foam while maintaining a high yield of slag without excess iron oxide and reduced carbon and carbon dioxide emission. The algae and slag foaming composition may be used in combination for slag formation and control.