A powder feeder system for a foundry system having a mixing hearth includes a housing assembly, and a feeder assembly in the housing assembly having a moveable barrel feeder for feeding a pre-weighed charge of metal powder into the mixing hearth of the foundry system during operation thereof. A method for recycling metal powder includes the steps of melting a content of the mixing hearth completely; and then feeding the metal powder into the mixing hearth while the contents of the mixing hearth are still molten using the powder feeder system.

A furnace for melting vitrifiable material, in particular glass, employs a submerged burner, the furnace including a wall cooled by a cooling fluid, the face of the wall facing toward the interior of the furnace having, before vitrifiable material is melted in the furnace, an attachment texture for so-called self-crucible devitrified vitrifiable material.

An arc furnace bottom construction for maintaining the outer surface temperature of the bottom construction essentially at least on the lower part of the arc furnace essentially close to the temperature surrounding the arc furnace. The bottom construction contains at least two constructions to be cooled and being positioned to each other in different heights seen from the side view.

The present invention provides a Co-free heat-resistant alloy for a hearth metal member that has properties superior to or equal to those of Co-containing heat resistant steel. The heat-resistant alloy for a hearth metal member according to the present invention is a heat-resistant alloy used in a hearth metal member of a steel heating furnace, the heat resistant alloy containing: 0.05% to 0.5% of C; more than 0% and 0.95% or less of Si, where 0.05%≤C+Si≤1.0%; more than 0% and 1.0% or less of Mn; 40% to 50% of Ni; 25% to 35% of Cr; 1.0% to 3.0% of W; and 10% or more of Fe and inevitable impurities as the balance, with all percentages being in mass %. The heat-resistant alloy for a hearth metal member may further contain 0.05% to 0.5% of Ti and/or 0.02% to 1.0% of Zr, with all percentages being in mass %.

A furnace for melting vitrifiable material, in particular glass, employs a submerged burner, the furnace including a wall cooled by a cooling fluid, the face of the wall facing toward the interior of the furnace having, before vitrifiable material is melted in the furnace, an attachment texture for so-called self-crucible devitrified vitrifiable material.

The present invention provides an electric furnace including: a furnace body that includes an electrode; and a slag holding furnace that is configured to hold molten slag in a molten state and is capable of pouring the molten slag into the furnace body when tilted, in which the furnace body includes a cylindrical furnace wall, a furnace cover that is provided at an upper end of the furnace wall, a furnace bottom that is provided at a lower end of the furnace wall and includes a deep bottom portion and a shallow bottom portion as a region having a height of 150 mm to 500 mm from a deepest point of the deep bottom portion, and a slag pouring port that is provided at the furnace cover and through which the molten slag is poured from the slag holding furnace, the slag pouring port overlaps the shallow bottom portion in a plan view, and the area ratio of the shallow bottom portion to the furnace bottom in a plan view is 5% to 40%.

The present invention provides a Co-free heat-resistant alloy for a hearth metal member that has properties superior to or equal to those of Co-containing heat resistant steel. The heat-resistant alloy for a hearth metal member according to the present invention is a heat-resistant alloy used in a hearth metal member of a steel heating furnace, the heat resistant alloy containing: 0.05% to 0.5% of C; more than 0% and 0.95% or less of Si, where 0.05% C+Si1.0%; more than 0% and 1.0% or less of Mn; 40% to 50% of Ni; 25% to 35% of Cr; 1.0% to 3.0% of W; and 10% or more of Fe and inevitable impurities as the balance, with all percentages being in mass %. The heat-resistant alloy for a hearth metal member may further contain 0.05% to 0.5% of Ti and/or 0.02% to 1.0% of Zr, with all percentages being in mass %

The present invention provides an electric furnace including: a furnace body that includes an electrode; and a slag holding furnace that is configured to hold molten slag in a molten state and is capable of pouring the molten slag into the furnace body when tilted, in which the furnace body includes a cylindrical furnace wall, a furnace cover that is provided at an upper end of the furnace wall, a furnace bottom that is provided at a lower end of the furnace wall and includes a deep bottom portion and a shallow bottom portion as a region having a height of 150 mm to 500 mm from a deepest point of the deep bottom portion, and a slag pouring port that is provided at the furnace cover and through which the molten slag is poured from the slag holding furnace, the slag pouring port overlaps the shallow bottom portion in a plan view, and the area ratio of the shallow bottom portion to the furnace bottom in a plan view is 5% to 40%.

A metallurgical furnace including a hearth, a sidewall structure, and a surrounding cooling element structure including cooling elements. Each cooling element have a planar back surface. A surrounding binding structure including binding sections surrounds partly the surrounding surface. Adjacent binding sections of the surrounding binding structure are connected by tension assemblies. At least one planar back surface of at least one cooling element is parallel with and is in a horizontal direction of the metallurgical furnace supported by at least one planar surface means of at least one binding section of the surrounding binding structure. Said at least one cooling element of the surrounding cooling element structure is located at least partly between the surrounding surface and said one binding section.

A metal melting and retention furnace is provided, wherein a tubular member in a furnace chamber, a table-like melting part is formed directly below the tubular member and a melting burner is arranged in the furnace chamber, a molten metal retention part in which the melting material which has been melted is introduced and which is provided with a retention burner for heating the introduced molten metal is formed around the outer circumference of the table-like melting part, and the molten metal in the molten metal retention part flows to a molten metal ladle part adjacent to the furnace chamber.