A metallurgical system for producing metals and metal alloys includes a fluid cooled mixing cold hearth having a melting cavity configured to hold a raw material for melting into a molten metal, and a mechanical drive configured to mount and move the mixing cold hearth for mixing the raw material. The system also includes a heat source configured to heat the raw material in the melting cavity, and a heat removal system configured to provide adjustable insulation for the molten metal. The mixing cold hearth can be configured as a removal element of an assembly of interchangeable mixing cold hearths, with each mixing cold hearth of the assembly configured for melting a specific category of raw materials. A process includes the steps of providing the mixing cold hearth, feeding the raw material into the melting cavity, heating the raw material, and moving the mixing cold hearth during the heating step.

A metallurgical system for producing metals and metal alloys includes a fluid cooled mixing cold hearth having a melting cavity configured to hold a raw material for melting into a molten metal, and a mechanical drive configured to mount and move the mixing cold hearth for mixing the raw material. The system also includes a heat source configured to heat the raw material in the melting cavity, and a heat removal system configured to provide adjustable insulation for the molten metal. The mixing cold hearth can be configured as a removal element of an assembly of interchangeable mixing cold hearths, with each mixing cold hearth of the assembly configured for melting a specific category of raw materials. A process includes the steps of providing the mixing cold hearth, feeding the raw material into the melting cavity, heating the raw material, and moving the mixing cold hearth during the heating step.

A sidewall suitable for use in a metallurgical furnace is provided. The sidewall has an upper wall, and an outer wall is coupled to the upper wall and extends downward from the upper wall. An inner wall is coupled to the upper wall and extends downward from the upper wall. The inner wall has an inner surface facing and circumscribed by the outer wall. A bottom wall is coupled to the inner wall. The bottom wall has a bottom extension wall extending away from the inner wall. A liner wall is attached to the bottom extension wall and extends upward in a spaced apart relationship to the inner wall. A spray cooling assembly is disposed between the inner wall and the outer wall. The spray cooling assembly is configured to spray coolant on the inner surface of the inner wall.

Weighing device for charge material fed into an electric arc furnace, which comprises a plurality of supports each comprising an upper plate, a lower plate and a weighing element in contact with and disposed between said two plates, wherein at least one of said weighing elements is a column load cell, and wherein each support comprises two connection elements perpendicular to each other, each having a tie rod connected to at least one upper terminal for connection to the upper plate and to at least one lower terminal for connection to the lower plate.

Proposed are a chilling unit, a heat treatment apparatus including same, and a heat treatment method. More particularly, proposed is a technology capable of rapidly and effectively lowering the temperature of a heating plate by bringing a heat exchange medium of a chilling unit into contact with the heating plate and then circulating a refrigerant after performing a heat treatment process of a substrate through a heat treatment apparatus.