Abstract: A process is divulged for the recovery of lithium from metallurgic slags comprising the steps of roasting spodumene to convert it from the alpha to the beta variant; reacting the beta variant with sulfuric acid, using a stoichiometric excess of acid; repulping the reaction product with water, forming an acidic slurry; neutralizing the acidic slurry to a pH between 5 and 7, by addition of at least one neutralizing agent; filtrating the neutralized slurry, thereby obtaining a lithium bearing solution and a residue; characterized that, in either one or both of the steps of repulping and neutralizing the acidic slurry, lithium-bearing metallurgic slag is added as neutralization agent. The lithium-bearing metallurgic slag is used to substitute at least part of the classic neutralizing agent. The lithium in the slag is released, and added to the lithium liberated from the spodumene.

Abstract: In a method for the inductive surface hardening of workpieces with any desired external geometries, especially camshafts for internal combustion engines, an inductor (15) is provided which at least partially surrounds the workpiece (2 or 4). The workpiece (2 or 4) executes a uniform rolling motion, and, given a constant coupling distance (X), the internal contour (18) of the inductor (15) represents a line parallel to the rolling contour (16) of the workpiece (2 or 4).

Abstract: A cooking heating apparatus has a vapor sensor for sensing the state of heating of food in a heating chamber, thus performing automatic control of the heating operation. An auxiliary exhaust opening for allowing vapor from the heated food to be introduced to the vapor sensor is formed in a region where the flow of the vapor is not influenced by a main flow of air supplied into the heating chamber and flowing towards a main exhaust opening. The vapor sensor is disposed so as to be exposed to the vapor introduced through the auxiliary exhaust opening. The condition of the vapor is therefore sensed quickly without being influenced by the main flow of air.