A delivery device for delivering stock material into a blast furnace includes a transition channel for the stock material, a chute for delivering the stock material, a first annular body, coaxial to and outside the transition channel, adapted to rotate about a first axis, and a second annular body, coaxial to and outside the first annular body, adapted to translate along the first axis with respect to said first annular body and/or to rotate about the first axis together with said first annular body. When the second body translates along the first axis, at least one fixed rack rotates at least one toothed wheel and a respective shaft about a second axis transversal to the first axis, thus causing a change in the inclination of the chute with respect to the first axis.

A delivery device for delivering stock material into a blast furnace includes a transition channel for the stock material, a chute for delivering the stock material, a first annular body, coaxial to and outside the transition channel, adapted to rotate about a first axis, and a second annular body, coaxial to and outside the first annular body, adapted to translate along the first axis with respect to said first annular body and/or to rotate about the first axis together with said first annular body. When the second body translates along the first axis, at least one fixed rack rotates at least one toothed wheel and a respective shaft about a second axis transversal to the first axis, thus causing a change in the inclination of the chute with respect to the first axis.

A device for producing expanded granulated material from mineral material in the form of grains of sand with an expanding agent includes a furnace with a furnace shaft, having an upper end and a lower end. A conveying section extends between the two ends and passes through a number of heating zones arranged separately from one another in a conveying direction. The device also includes at least one feeder in order to charge at least the unexpanded material into the furnace shaft at one of the two ends in the direction of the other of the two ends. At least one directing element is at least partly arranged in the furnace shaft and forms a gap with an inner wall of the furnace shaft, at least in the region of one of the two ends. The at least one feeder is designed for charging the material into the gap.

A device for producing expanded granulated material from mineral material in the form of grains of sand with an expanding agent includes a furnace with a furnace shaft, having an upper end and a lower end. A conveying section extends between the two ends and passes through a number of heating zones arranged separately from one another in a conveying direction. The device also includes at least one feeder in order to charge at least the unexpanded material into the furnace shaft at one of the two ends in the direction of the other of the two ends. At least one directing element is at least partly arranged in the furnace shaft and forms a gap with an inner wall of the furnace shaft, at least in the region of one of the two ends. The at least one feeder is designed for charging the material into the gap.

A method for calcining mineral rock in a regenerative parallel-flow vertical shaft furnace including the steps of collecting a portion of the gaseous effluent discharged, in preheating mode, from the furnace shaft in a recirculating circuit, forming an oxidizing mixture by mixing the portion collected from the gaseous effluent with concentrated dioxygen from a dioxygen source, and inserting the oxidizing mixture into the top of the shaft in firing mode so as to ensure the combustion of fuel in the presence of oxygen. The gaseous effluent discharged from the furnace having a high concentration of CO.sub.2.

A method for calcining mineral rock in a regenerative parallel-flow vertical shaft furnace including the steps of collecting a portion of the gaseous effluent discharged, in preheating mode, from the furnace shaft in a recirculating circuit, forming an oxidizing mixture by mixing the portion collected from the gaseous effluent with concentrated dioxygen from a dioxygen source, and inserting the oxidizing mixture into the top of the shaft in firing mode so as to ensure the combustion of fuel in the presence of oxygen. The gaseous effluent discharged from the furnace having a high concentration of CO.sub.2.

A side-type powder top blown furnace and method for treating the furnace is disclosed. The furnace includes a cylindrical furnace body, powder material inlet nozzles, a furnace top sample rod, a top blown furnace spray gun, a belt feeding inlet, a branch conveying pipe, a quantitative pneumatic conveying device, a powder material collecting bin, a powder collecting bin feeding inlet and a furnace top cover; the powder material inlet nozzles are symmetrically arranged around a furnace wall of the cylindrical furnace body on the same horizontal plane. The disclosure can solve the problems of large transportation flying loss, large return amount, poor operating environment, harm to the health of operators and the like in the tin smelting process.

A side-type powder top blown furnace and method for treating the furnace is disclosed. The furnace includes a cylindrical furnace body, powder material inlet nozzles, a furnace top sample rod, a top blown furnace spray gun, a belt feeding inlet, a branch conveying pipe, a quantitative pneumatic conveying device, a powder material collecting bin, a powder collecting bin feeding inlet and a furnace top cover; the powder material inlet nozzles are symmetrically arranged around a furnace wall of the cylindrical furnace body on the same horizontal plane. The disclosure can solve the problems of large transportation flying loss, large return amount, poor operating environment, harm to the health of operators and the like in the tin smelting process.

A charging system for a shaft smelt reduction furnace includes a frame structure for mounting on a top charge opening of a shaft smelt reduction vessel; a center shaft arrangement supported by the frame structure and for removing off-gas gases from the furnace and to introduce granular charge materials to form a stack of materials in the furnace. The center shaft arrangement includes a center hood for off-gas extraction; a pair of first and second feed channels for first and second materials. The center hood includes a pair of facing off-gas panels defining an off-gas channel. The partition walls include lower portions that extend towards each other below the center hood to define a center feed passage, whereby material descending through the first feed channels may accumulate on lower portions according to the angle of repose of the material, permitting self-adjustment of the first material stock-line in the shaft arrangement.

A charging system for a shaft smelt reduction furnace includes a frame structure for mounting on a top charge opening of a shaft smelt reduction vessel; a center shaft arrangement supported by the frame structure and for removing off-gas gases from the furnace and to introduce granular charge materials to form a stack of materials in the furnace. The center shaft arrangement includes a center hood for off-gas extraction; a pair of first and second feed channels for first and second materials. The center hood includes a pair of facing off-gas panels defining an off-gas channel. The partition walls include lower portions that extend towards each other below the center hood to define a center feed passage, whereby material descending through the first feed channels may accumulate on lower portions according to the angle of repose of the material, permitting self-adjustment of the first material stock-line in the shaft arrangement.