Aluminium Pechiney

Fcb Aluminium

Christian Dreyer

Jean-Claude Thomas

Claude Vanvoren

Jerome Bos

Aristide Valassopoulos

Jean-Christophe Rotger

Silvino Caetano

Nigel Backhouse

Bernard Boffa

Sebastien Couvreur

Bernard Samanos

Patrick Claudel

Device for equipment of a cell () comprising an electrolytic bath () covered with a crust (), with a chisel () that can be moved vertically between a high position in which it is above the crust () and a low position in which the crust () is perforated and in which contact is made with the bath (), the device () comprising means of detecting electrical contact between the chisel () and the bath (), these means comprising an electrical circuit () capable of making an electrical measurement between the chisel () and a point () in the cell used as an electrical reference, and taking immediate action on the actuator to cause vertical upwards displacement of the chisel when a predetermined value of an electrical measurement is reached. The electrical circuit () is connected to the chisel (), to the rod () of the chisel () or to the actuator rod () through connecting means capable of creating a point contact () at least one point between the circuit () and the chisel (), the rod () of the chisel () or the actuator rod, these connecting means () being acted upon by elastic means () pushing them towards the chisel (), the rod () of the chisel () or the actuator rod () respectively.

Device for controlling the travel distance of a chisel in a feeding system for an aluminium production electrolytic cell

The invention relates to a ring furnace pit () cooling method, comprising the production of a flux F of cooling fluid inside the pit () and the flow of at least a part Fr of said flux F in a roughly vertical manner along determined surfaces of the walls (A,B) of the pit (). The invention also relates to a device capable of implementing the method. The invention makes it possible to accelerate the cooling rate of ring furnace pits considerably.

Method and cooling device for the subracks in a chamber furnace

The invention relates to a simplified production process with which it is possible to obtain carbon blocks, in particular anodes intended for aluminium production using the Hall-H&#xe9;roult electrolysis process, which have high thermal shock resistance. This process comprises a grain size distribution adjustment operation of a carbon aggregate which includes:

Method for making carbon blocks highly resistant to thermal shock

A process for regulating a furnace which includes a sequence of sections, cooling sections, baking sections, and preheating sections, in which the preheating sections at the tail are fitted with exhaust pipes for combustion gases, and in the transverse direction with a series of flue walls and pits in which blocks containing carbon to be baked are stacked, in which gas streams circulate through the flue walls. The mass flow in each of the streams of combustion exhaust gases is regulated by measuring this flow and the temperature in order to obtain a predetermined set value of energy flux.

Process and regulation device for ring furnaces

The furnace for baking carbonaceous blocks comprises, along the longitudinal X direction of the furnace, a series of sections, each section comprising, in the transverse Y direction, hollow walls (3) through which a heating gas flow comprising combustion gas or a cooling air flow circulates, alternating with pits containing carbonaceous blocks to be baked, each of the said hollow walls (3) in a section being in communication with a wall in an upstream section and/or a wall in a downstream section, so as to form a conduit through which the said gas flow circulates, each of the said walls of a section comprising two vertical lateral partitions (38) in the X-Z plane, and elements in the transverse Y direction for deflecting the said gas flow passing through the said wall and maintaining a constant spacing between the said lateral partitions (38), and characterized in that each wall (3) comprises a means of maintaining, over at least one third of the length L of said wall, a gas flow of rate D uniformly distributed over the entire normal cross-section S, with a decree of uniformity of the distribution of said flow of rete D defined by the expression '2yD-0.5yD/yS', where '2yD-0.5yD' denotes the extent of the range of the flow D corresponding to a fraction y of the said normal cross-section S, and in which y is not more than 0.25.

Ring furnace with central tubular flow

A process as disclosed for constructing a furnace for open chambers for baking carbonaceous blocks, comprising arranging a plurality of chambers in a series or in two parallel series, each chamber being defined by lateral partitions and transverse partitions, disposing the plurality of chambers within an independent concrete casing formed by a floor and lateral wall portions having disposed thereof a plurality of vertical buttresses and compressively prestressing the vertical buttresses in the vertical direction. A horizontal force may also be applied to the upper part of the transverse partitions.

Process for constructing furnaces with open chambers, for avoiding

Apparatus and process for optimizing combustion in chamber-type furnaces

The invention concerns an improvement in a suction or blowing pipe for a furnace having partition chambers intended for the firing of carbonaceous blocks. The pipe comprises a main body (3) provided with a plurality of nozzles (10) to which tubular nipples (2) are connected in a number equal to the number or partitions (5) forming the chambers of the furnace. Each of the nipples is connected to a transverse furnace wall (9) or a partition (5) by a taphole (8) disposed in the upper part of the wall or partition. The improvement comprises forming each nipple by at least two tubular elements disposed in series, a first element (15) provided in its upper part (15A) with a first flat flange (18) adapted to cooperate in jointed relationship and in respect of rotation with a flat flange (19) located in the lower part of a nozzle (10), and in its lower part (15C) with a second flat flange (27) which is parallel to the first flat flange (18), and a second element (16) provided in its upper part (16A) with a third flat flange (26) which cooperates in jointed relationship and in respect of rotation with the second flange (27). The first and second elements have over at least part of their height an axis inclined by an angle .alpha. with respect to the axis 23 which is perpendicular to the plane of the flanges.

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St. Jean de Maurienne, France

Christian Dreyer