Abstract: The invention relates to a method for removing solids in dust and sulphur oxides from process gases generated in a metallurgical process by a wet process. At least part of basic liquid is fed into the gas flow containing solids in at least one cascade scrubber in order to mix basic liquid with the gases and solids to be cleaned at the latest during the wetting of the gases and solids in the water space of the cascade scrubber, and the mixture containing basic liquid, wetted gases and solids are directed to have a cascade shower in each cascade scrubber in order to remove sulphur and solids from the gases.

Abstract: The invention relates to a method for producing a ferroalloy containing nickel. From a fine-grained raw material containing iron and chromium and a fine-grained raw material containing nickel, a mixture is formed with binding agent, the mixture is agglomerated so that first formed objects of desired size are obtained. The objects formed are heat treated in order to strengthen the objects so that the heat treated objects withstand conveyance and loading into a smelter furnace. Further, the objects are smelted under reducing circumstances in order to achieve ferrochromenickel, a ferroalloy of a desired composition containing at least iron, chromium and nickel.

Abstract: The invention relates to a method for removing solids in dust and sulphur oxides from process gases generated in a metallurgical process by a wet process. At least part of basic liquid is fed into the gas flow containing solids in at least one cascade scrubber in order to mix basic liquid with the gases and solids to be cleaned at the latest during the wetting of the gases and solids in the water space of the cascade scrubber, and the mixture containing basic liquid, wetted gases and solids are directed to have a cascade shower in each cascade scrubber in order to remove sulphur and solids from the gases.

Abstract: The invention relates to a method for improving the reduction degree of metal components in a chromite concentrate when smelting ferroalloy suitable for manufacturing of stainless steel. The chromite concentrate is fed together with nickel-containing raw material so that by means the amount of nickel-containing raw material it is achieved a desired reduction degree for the metal components of ferroalloy.

Abstract: The invention relates to a method for producing a ferroalloy containing nickel. From a fine-grained raw material containing iron and chromium and a fine-grained raw material containing nickel, a mixture is formed with binding agent, the mixture is agglomerated so that first formed objects of desired size are obtained. The objects formed are heat treated in order to strengthen the objects so that the heat treated objects withstand conveyance and loading into a smelter furnace. Further, the objects are smelted under reducing circumstances in order to achieve ferrochromenickel, a ferroalloy of a desired composition containing at least iron, chromium and nickel.

Abstract: The invention relates to a method for producing a ferroalloy containing nickel. From a fine-grained raw material containing iron and chromium and a fine-grained raw material containing nickel, a mixture is formed with binding agent, the mixture is agglomerated so that first formed objects of desired size are obtained. The objects formed are heat treated in order to strengthen the objects so that the heat treated objects withstand conveyance and loading into a smelter furnace. Further, the objects are smelted under reducing circumstances in order to achieve ferrochromenickel, a ferroalloy of a desired composition containing at least iron, chromium and nickel.

Abstract: The invention relates to a method for producing a ferroalloy containing nickel. From a fine-grained raw material containing iron and chromium and a fine- grained raw material containing nickel, a mixture is formed with binding agent, the mixture is agglomerated so that first formed objects of desired size are obtained. The objects formed are heat treated in order to strengthen the objects so that the heat treated objects withstand conveyance and loading into a smelter furnace. Further, the objects are smelted under reducing circumstances in order to achieve ferrochromenickel, a ferroalloy of a desired composition containing at least iron, chromium and nickel.

Abstract: The invention relates to a method and an apparatus for filtering process gas created in the ferroalloy smelting process, i.e. carbon monoxide gas, in order to essentially reduce the content of solids in the gas. In the filtering unit (24) gas containing solids is conducted through at least one filtering element (7), inert gas blowing (8) is directed to the filtering element (7) in order to detach the solid material from the surface of the filtering element (7), and in order to remove from the filtering unit (24) the solid material detached from the the surface of the filtering element (7) the solid material is slurried by means of liquid fed (11) into the filtering unit (24). The slurry containing the sold material is removed from the filtering unit (24) through a discharge chamber (12).

Abstract: This invention relates to a cascade-type scrubber, with which the wet scrubbing of the exhaust gas and removal of droplets from the gas can be performed in one and the same scrubber, producing a pure, dropless gas. It is thus essential that the cascade tubing typical of the cascade scrubber and the equipment for droplet removal are combined into a single compact entity, which is formed of several nested chambers.

Abstract: The invention relates to an arrangement and method for heating gases in a gas circulation duct in connection with continuously operated sintering. In the sintering furnace, hot gas is fed in from above the belt in order to sinter the material located on the belt, and part of the gas circulation duct is formed as a burning zone, a burner ring, where the gas is heated. The burner ring comprises at least one burner unit directed inwardly from the circumference of the gas circulation duct.

Abstract: The invention relates to a method for measuring the surface height of a material bed transported on a conveyor belt to continuously operated thermal treatment, i.e. to continuously operated sintering, when said material bed is formed of single spherical and fragile particles.

Abstract: A conveyor belt for a continuously operated conveyor-type thermal treatment of a material bed includes metal conveyor belt elements that are connected to each other. Each conveyor belt element is formed with perforations in order to allow gas to flow through the conveyor belt. The perforations are distributed non-uniformly over the conveyor belt element and are located in at least two perforation zones. The perforation zones are separated from each other by perforation-free zones.

Abstract: The invention relates to a method for measuring the surface height of a material bed transported on a conveyor belt to continuously operated thermal treatment, i.e. to continuously operated sintering, when said material bed is formed of single spherical and fragile particles.

Abstract: The invention relates to an arrangement and method for heating gases in a gas circulation duct in connection with continuously operated sintering. In the sintering furnace, hot gas is fed in from above the belt in order to sinter the material located on the belt, and part of the gas circulation duct is formed as a burning zone, a burner ring, where the gas is heated. The burner ring comprises at least one burner unit directed inwardly from the circumference of the gas circulation duct.

Abstract: The invention relates to a conveyor belt to be used in a continuously operated conveyor-type thermal treatment, i.e. sintering, of a material bed. The conveyor belt is provided with perforations in order to allow the gases that are used for heating and possibly cooling the material bed to flow through the material bed and the conveyor belt. According to the invention, the conveyor belt is made of a perforated, at least one-part element made of a metal piece and allowing the gases to flow through said element being mechanically connected to the preceding and successive element in the proceeding direction of the conveyor belt by means of a junction made in the lateral direction of said conveyor belt, and the perforations are arranged in zones alternating with perforation-free element pats.

Abstract: The invention relates to a method according to which the wet scrubbing of a gas flow is performed in at least three, advantageously six successive steps or phases, and the droplet separation of the scrubbed gases is carried out in a uniform cyclone-like droplet separator composed of several nested cylinders. The invention also relates to a method for momentarily bypassing, during a capacity rise, a scrubbing phase that causes pressure loss. As a result, there is obtained a clean and dropless gas that falls below the allowed dust content limits and can thus be either conducted to combustion or discharged in the open air. The invention also relates to an apparatus, a multiphase scrubber, for realizing the method. The invention is particularly suited to be used for scrubbing hot furnace gases from closed reduction furnaces, where said furnace gases contain easily inflammable components.

Abstract: A multiphase scrubber for the wet scrubbing of gases in several different phases comprises at least three separate basic scrubbing units so that the scrubbing of the gas is carried out in at least three, advantageously six, successive steps. The droplet separation of the scrubbed gases is carried out in a uniform cyclone-like droplet separator composed of several nested cylinders. A clean dropless gas contains a dust content below the acceptable limit. The scrubber is suited for scrubbing hot furnace gases from closed reduction furnaces.

Abstract: A carrying strap for a weapon, attached to the weapon in such manner that it forms a loop intended to be kept across one shoulder and the back, whereby the weapon can be held in front of the person supported by the carrying strap, ready to fire. A drawback of all carrying straps is that the weapon is hanging upside down when in the ready-to-fire position. The carrying strap of the invention has, at least at one attachment point, a laterally stiff strap section so that the center of gravity of the weapon, in correct ready-to-fire position, lies below the line defined by the stiffener and the other attachment point.

Abstract: A sledge or equivalent transporting base, consisting of a frame (1) and of thereinunder mounted travelling members such as runners (2), with reference to which the frame is movable in the direction longitudinal to the sledge. To the runner (2) has been pivotally attached an arc-shaped rolling member (3) with the center-point of its radius at the pivotal point and which is free to roll along an opposed counterface (5) on the frame (1). With the aid of the invention, sledge runners which have frozen fast to snow or ice can be easily freed by first backing up so that the load rolls into its rear position, whereafter the sledge is started, whereby with the aid of the load's mass the runners are jerked free from frozen-on snow and ice.