A waste heat recovery boiler in producing glass beads includes an equipment base arranged at the lower part of the waste heat recovery boiler. The upper part of the equipment base is connected with a cylindrical combustion production chamber, the lower part of the combustion production chamber is provided with a raw material inlet with single-layer or staggered layers. A finished product outlet is arranged at the lower end inside the combustion diffusion chamber, a membrane wall is arranged outside the combustion diffusion chamber, a steam-water lead-out straight tube system is symmetrically arranged at the upper end of the combustion diffusion chamber, a top annular water collecting tank is connected between the steam-water lead-out straight tube system and a steam-water lead-out tube system, and the steam-water lead-out tube system is connected with an upper drum.

An induration machine includes a travelling grate for transporting bulk material along a transport direction from a heating zone for heating and/or drying the material to a cooling zone for cooling the material by cooling gas. The machine includes a hood disposed over the travelling grate having a first hood section in the heating zone and a second hood section in the cooling zone; and two recuperation ducts for guiding used cooling gas from the second hood section to the first hood section. The recuperation ducts are disposed on opposite sides of the hood, are laterally offset with respect to the hood, and are connected to the second hood section by a V-shaped gas collector duct. Each recuperation duct is connected to the first hood section by at least one gas supply duct and has at least one dust purge opening disposed in the lowermost part of the recuperation duct for purging dust from the recuperation duct.

Provided are a method and an arrangement for feeding process gases from a suspension smelting furnace into a waste heat boiler. The arrangement comprises a feeding throat for feeding process gas. The feeding throat is connected to an uptake inner space at an exit. The feeding throat is connected to the waste heat boiler at an entrance. The feeding throat having a feeding channel comprising a channel inner roof. At least one of an uptake inner roof of the uptake of the suspension smelting furnace and the channel inner roof of the feeding channel of the feeding throat is provided with an angled and/or curved section that slopes at least partly downwardly in an angled and/or curved manner in the direction towards the entrance.

An exhaust structure includes an intake section including a first high thermal conductivity material, the intake section having an inlet, an output section including a second high thermal conductivity material, the output section having an outlet, and a piping section including a third high thermal conductivity material, the piping section being configured to communicatively couple the intake section with the output section. The exhaust structure provides a high thermal conductivity path from the inlet to the outlet, the high thermal conductivity path including the first high thermal conductivity material, the second high thermal conductivity material, and the third high thermal conductivity material.

A duct system of an electric arc furnace includes a plurality of walls each including sinuously winding piping having an inlet and an outlet, and a portion of a first wall of the plurality of walls forming a working platform. The platform is movable between a raised position and a lowered position. In the raised position, the portion of the first wall is disposed in proximate vertical alignment with the remainder of the first wall. In the lowered position, the portion of the first wall is disposed substantially perpendicularly to the remainder of the first wall. The portion of the first wall is sized to occupy a cross-sectional area formed by the plurality of walls such that the portion of the first wall is disposed in close proximity to the other of the plurality of walls.

A dividing-wall rotary kiln device comprises a rotary kiln, an exhaust gas residual-heat power generation device, a gas recovery processing device, a cooler, a combustion fan, a feeding system and an exhaust emission system. A refractory brick unit of a kiln body is a hollow structure formed by a refractory inner cylinder and a refractory outer cylinder. A center of the refractory inner cylinder is a kiln chamber. A material channel is between the refractory inner cylinder and the refractory outer cylinder. The feeding system is connected to a feeding device via a raw material preheating compartment or a dividing-wall preheater. The feeding device is provided with a decomposition gas outlet connected to the gas recovery processing device via the raw material preheating compartment or the dividing-wall preheater. The kiln chamber is connected to the exhaust gas residual-heat power generation device via a kiln tail hood.

A molten metal rotor receives and retains an end of a molten metal rotor shaft. The rotor shaft has one or more projections at the end received in the rotor. The rotor has an inner cavity, a top surface with an opening leading to the inner cavity, and at least one abutment. The opening includes one or more portions for allowing each projection to pass through the opening and into the inner cavity. The rotor and/or shaft are then rotated so at least one of the outwardly-extending projections is under the top surface of the rotor and is against an abutment. A molten metal pump, rotary degasser scrap melter or other device used in molten metal may utilize a rotor/shaft combination as disclosed herein.

The invention relates to a method and a recovery system for obtaining/recovering metallic iron and/or iron compounds, in particular iron chloride, from ores and/or ore tailings, especially from pyrite tailings, preferably from roasted pyrites produced during sulphuric acid manufacture.

A method for producing high carbon content metallic iron using coke oven gas, including: dividing a top gas stream from a direct reduction shaft furnace into a first top gas stream and a second top gas stream; mixing the first top gas stream with a coke oven gas stream from a coke oven gas source and processing at least a portion of a resulting combined coke oven gas stream in a carbon dioxide separation unit to form a synthesis gas-rich gas stream and a carbon-dioxide rich gas stream; delivering the synthesis gas-rich gas stream to the direct reduction shaft furnace as bustle gas; using the carbon-dioxide rich gas stream as fuel gas in one or more heating units; and delivering the second top gas stream to the direct reduction shaft furnace as bustle gas.

Continuous annealing equipment (1) including a cleaning device (11, 12) for performing a cleaning treatment on a steel strip (S) and an annealing device (12) for performing an annealing treatment on the steel strip (S) comprises an exhaust gas passage (31, 41) through which an exhaust gas discharged from the annealing device (12) flows, a solution circulation passage (32, 51) through which a cleaning solution used in the cleaning device (11, 12) circulates, and a heat exchanger (53) which forms a part of the solution circulation passage (32, 51) and contacts with the exhaust gas.