Abstract: A Collapsible Trailer is disclosed. Also disclosed is a trailer that is lightweight, but durable, and includes a set of detachable deck segments that can be assembled into a deck. The trailer further includes a suspension assembly that attaches to the deck once the deck is assembled or, alternatively, is permanently attached to one deck segment. The horizontal intra-deck segment support is provided by slidable rods that are extendable to bridge the intersection between a pair of adjacent segments. Each deck segment has a male edge and a female edge; the male edge can be inserted into the female edge to create an interlocking hinge-like structure to provide longitudinal stability along the special plane of the assembled deck. Furthermore, the deck and trailer can be assembled without the need for any tools or additional equipment. In all cases, the deck segments, when disassembled, stackable into a condensed deck stack.

Abstract: An electric arc furnace (1), wherein solids are injected into the furnace chamber. The lances (9, 10, 11) are guided through the wall (12) of the electric arc furnace (1) and inserted into the wall of the furnace, whereby at least one lance is associated with each electrode (2, 3, 4), in order to enable a homogenous formation of slag and to inject as great an amount of solids as possible. The lances are distributed in an approximately uniform manner along the periphery of the furnace. The inclination of the lances and thus the angle of injection are selected in such a way that they form an angle of approximately 30-80° in relation to the flow direction of the melting bath and form an angle of approximately 10-30° in relation to the horizontal.

Abstract: In order to operate an electric arc furnace (1) in optimum conditions, especially in order to build up and maintain a certain intensity of foamed slag, the amount of slag builder fed into the furnace (1) and therefore the power consumption of the furnace (1) is regulated according to the current received by the electrodes (2) in such a way that a maximum amount of slag builder is initially added in order to build up said foamed slag until the amount of current received by the electrodes (2) is reduced. Subsequently, the amount of added slag builder is reduced until the amount of current received reaches a predetermined set value. The theoretical amount of current received is kept constant by reducing or increasing the added amount of slag builder.

Abstract: The invention relates to a method for feeding solids into metal or steel melts whereby granular solids required during the analysis adjustment are fed in a predetermined quantity into the turbulent regions of the metal melt in a dense flow process by means of a pneumatic conveying device in order to achieve a high output while avoiding expensive and complex measures associated with lances and capital-intensive investments for injection devices and lance-moving devices.