Abstract

The invention relates to an electrically heated shaft furnace (5) comprising at least one heating element (12) which is configured by conductors. The invention is characterized in that the one or more heating elements (12) consist of carbon.

IPC Classes  ?

• F27B 1/08 - Shaft or like vertical or substantially vertical furnaces heated otherwise than by solid fuel mixed with charge
• F27B 9/06 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and chargeFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity electrically heated
• F27D 11/02 - Ohmic resistance heating
• F27D 99/00 - Subject matter not provided for in other groups of this subclass

Abstract

The invention relates to a method for working up metal oxide-containing dusts or slag with a heated, column-shaped bed of coke from which the reaction gases are drawn off and melt is tapped at the foot. In a first part of the axial length of the column-shaped bed of coke, said column-shaped bed of coke is disposed as a heated coke ring about a central loading opening. The solid dust or the melt is loaded into the hot bed of coke below the loading plane for coke into the coke ring. The device is characterized by the fact that a central loading space (4) for the charge is formed at the head end and is surrounded by an annular space (5) for accommodating the coke, that nozzles (9) for a hot-air blast, oxygen, and/or hot waste gases of the combustion and, optionally, fuels, are connected to the annular coke space (5), that the annular coke space (5) has a pressure-resistant lock (3) at its cold head end, and that exhaust pipelines (13, 14) for the reaction gases are connected to the reactor (1) at or below the lower edge of the annular coke space(5).

IPC Classes  ?

• F27B 1/20 - Arrangement of devices for charging
• C21B 7/20 - Bell-and-hopper arrangements with appliances for distributing the burden
• C22B 7/04 - Working-up slag
• F27D 3/00 - ChargingDischargingManipulation of charge

Abstract

In a method for reducing oxidic slags and dusts, possibly laden with organics, by using an inductively heatable coke bed extending in an axial direction and having a temperature gradient, reaction gas is extracted by suction in an axial region of the coke bed between two induction bodies and the metal regulus and the slag melt at the lower end of the coke bed are tapped. An inductively heatable shaft furnace which can be filled with a bed of coke in lump form, for reducing metallic slags, possibly laden with organics, is made of electrically insulating, refractory material and can have a temperature gradient set in it, with at least one cooled induction body arranged at the head, has a suction connection in an axial region in which the prevailing temperature is above the condensation point of impurities to be removed and which lies below the cooled induction body arranged at the head, wherein an opening for tapping the metal regulus and the slag melt is provided at the lower end of the furnace.

IPC Classes  ?

• C22B 5/10 - Dry processes by solid carbonaceous reducing agents
• C22B 7/04 - Working-up slag

Abstract

The invention relates to a method for cooling and converting hot exhaust gases, especially combustion gases, or reaction gases from gasification or pyrolysis reactions of reductive high temperature reactors for metallurgy, inorganic technology and environment technology. According to said method, in a first step, oxygen and water or water vapour are used to cool to temperatures of between 605°C and 1050°C with simultaneous oxidation of CO and H2 and reduced parts of Zn, Cd, Cu and/or Hg, and optionally CuCl2, CuSo4, ZnCl2 are pyrohydrolytically split, following which a cooling process is carried out in a second step, to a temperature above the dew point of water.

IPC Classes  ?

• B01D 53/62 - Carbon oxides
• B01D 53/64 - Heavy metals or compounds thereof, e.g. mercury
• B01D 53/68 - Halogens or halogen compounds

Abstract

Disclosed is a method for reprocessing metallurgical dust or grinding dust, especially converter dust and arc furnace dust obtained from steel or high-grade steel production. In said method, the dust is burned and slagged with oxygen in oxidizing conditions in a melt burner (1), and the obtained slag is introduced into an inductively heated reduction furnace (17) containing a coke bed (49). Carbon monoxide formed during the reduction of the slag is withdrawn at the top of the reduction furnace (17) as gas along with Zn vapor, whereupon Zn is condensed or the gas is reformed with water or steam so as to form ZnO and hydrogen and is redirected into the melt burner (1) after separating the ZnO. The inventive apparatus for carrying out the disclosed method is characterized in that a dosing cone (3) is provided which comprises a burner lance (4) and a feeding device for the charge and which extends into a diffuser (44) via a feeding zone having a reduced cross-section and via an annular slot (41) that surrounds the burner lance (4). Furthermore, the combustion chamber (1) adjoins the diffuser (44) while an inductively heated coke column is connected to a bottom discharge port of the combustion chamber as a reduction furnace whose top end is equipped with at least one connection (56) for feeding coke as well as an exhaust gas connection (50) for withdrawing carbon monoxide and Zn vapor.

IPC Classes  ?

• C21B 3/04 - Recovery of by-products, e.g. slag
• C22B 7/02 - Working-up flue dust
• C22B 9/00 - General processes of refining or remelting of metalsApparatus for electroslag or arc remelting of metals
• C22B 19/30 - Obtaining zinc or zinc oxide from metallic residues or scraps