Abstract: A hot-blast main for a hot-blast stove system of a blast furnace has a refractory structure comprising a plurality of courses of refractory bricks. At least a first one of the courses has at least one part thereof comprised of a plurality of expansion-joint forming bricks whose dimensions and arrangement are such that, in the cold condition of the hot blast main, there are provided radial expansion joints between the expansion-joint forming bricks and at least one adjacent part of the hot-blast main. At least some of the expansion-joint forming bricks of the first course are placed radially staggered relative to at least one adjacent such brick in each case, so that the expansion joints are provided at both the radially inner side and the radially outer side of said first course. This construction accommodates differential thermal expansions and provides good stability of the structure.

Abstract: A ceramic gas burner for a combustion chamber of a hot-blast stove of a blast furnace has parallel vertical supply ducts for the two combustion components (gas and air). One duct opens upwardly at a first outlet opening which is rectangular in shape. The second duct opens at second outlet openings which are on each side of and above the first outlet opening and whose outflow directions are oblique to that of the first outlet opening. Recesses extend in each long side of the first opening towards the second openings. To improve the mixing of the two components, opposite each recess there is another such recess in the other long side of the opening.

Abstract: A ceramic burner for a hot blast stove, having a burner head where the combustion components mix and an air duct and a gas duct beneath the head for conducting combustion components to the head, the gas duct is within the air duct and is bounded by a wall. To prevent stresses due to differences of thermal expansion at least one horizontal sliding joint is arranged in the bounding wall of the gas duct closely under the burner head. The air duct is bounded by a brickwork wall which continues upwardly past the burner head and forms a combustion chamber. The burner head projects over and is supported by a shoulder in this wall and an essentially vertical expansion joint is located between the burner head and the wall.

Abstract: A coke oven battery has a refractory brick structure comprising a row of coking chambers (1) between an oven roof (9) and a regenerator roof (10) and a row of regenerative chambers (2) between the regenerator roof (10) and a regenerator floor (11). In order to provide protection (e.g. for an external steel frame) against leakage of inflammable gas, cladding (16-24) of metal foil is provided at both the pusher side and the coke side. This cladding makes a substantially gas tight seal with the refractory brick. The foil preferably has a thickness of 0.05 to 0.25 mm.

Abstract: In a shaft furnace having a metal shell, a refractory lining of relatively high thermal conductivity and cooling bodies which project inwardly through the shell into the lining and through which in operation cooling liquid flows, has a high uniformity of temperature in the lining. In order to improve its operational characteristics, in particular to improve temperature uniformity yet further while reducing heat loss, the shell and the cooling bodies are screened from the lining. Between the cooling bodies and the refractory lining and between the shell and the refractory lining there are respectively first and second thin layers of refractory material having in each case a .lambda.-value of less than 5 kcal/mh .degree.C., preferably less than 1.5 kcal/mh .degree.C. The thin layers may be of refractory felt or refractory plates.

Abstract: Ceramic sealing rope, with a core of a strand (1) of yarns (2), each yarn (2) around a solid metal wire (3) and around the core one or more sleeves (4, 5, 7), each sleeve woven crosswire of multiple yarns, each yarn around a solid metal wire.

Abstract: In a shaft furnace having a metal shell, a refractory furnace lining inside the shell and a taphole construction comprising a drilled taphole extending through a plug located in an aperture in the shell and a taphole brick structure forming part of said furnace lining, the taphole brick structure at least partly consists of at least one taphole brick of high thermal conductivity material selected from the group comprising graphite, semi-graphite and material of equivalent heat conductivity, there further being screening means comprising material of substantially lower heat conductivity coefficient than graphite and semi-graphite located between said taphole brick and said furnace shell.

Abstract: A vertical spigot joint for sealing the space between the socket and the end of a pipe inserted in the socket has an aluminium cord sealing the space and a filler mixture. The filler mixture comprises aluminium cement, vermiculite grains and a plastics material which retains its plastic properties in use. A sleeve of a glass fibre cloth coated with protective layers covers the joint and is secured to the pipe end and socket by silicone putty and by clamping strips. A thermally insulating refractory ceramic felt is provided between the pipe end and the filler material. The use of this filler mixture, together with the provision of the sleeve enables a joint to be produced which is gas-tight and absorbs relative movement of the pipe end and socket due to the media in the pipe or due to thermal expansion and contraction.

Abstract: A shaft furnace has a refractory lining within its armour and cooling plates located in recesses in the lining. In order to make it easier to remove and replace the cooling plates and to improve heat transfer, it is now proposed to construct the recess walls of special shaped members so that the recess retains its shape. The shaped members include elongate side members, a cover member resting on the elongate members, a bottom member below the elongate members and a front member between the front edge of the cooling plate and the furnace interior. Copper sheets may be provided between the cooling plate and these shaped members.

Abstract: A closure plate for hot blast slide valves of the type having a hollow ring of box-like cross section cooled by running water to whose inner circumference a body is attached by welding, which is formed by parallel plates and is likewise cooled by running water. The thickness of the body in axial direction is smaller than the axial length of the hollow ring, and the outer surfaces are coated to about the height of the front faces of the ring with refractory concrete, the coating being tied to these outer surfaces by anchoring means.

Abstract: In a shaft furnace which has a wall comprising of a shell and stave-coolers inside the shell, and a refractory lining of the wall supported by projections (supporting cams) on the stave-coolers, there are provided special bricks, preferably of material of superior refractoriness, strength, chemical resistance and wear-resistance, which rest on the projections and extend beyond the projections both towards and away from the shell. The bricks are fixed in the furnace wall, for instance by means of a ramming mass, and are preferably received in recessed in the stave-coolers.