Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1990-10-17
1992-03-17
Valentine, Donald R.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 71, 264275, 264277, 264104, 425116, 425127, 204279, 204294, H05B 602, B29C 6900, B28B 310, C25B 312
Patent
active
050966316
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to methods for providing a collar about an anode nipple, and the device for carrying out said method. The invention especially finds application in protecting anodes for use in aluminium industry.
Most aluminium works at present utilize a technology based on pre-baked anodes, the Soderberg-process being abandoned in production.
Novel technology involves use of anodes that are completed in advance for use, as opposed to the Soderberg-process according to which the anode is continuously moulded into the bath. The anode block proper is moulded onto a hanger means serving both as a suspension means in the furnace, and as a current-carrying element. The hanger means is moulded onto the block by use of cast steel. As the anode is burned off and lowered into the bath, cast steel and nipples on the hanger means will get so close to the bath that problems will arise because steel is corroded off. Primarily, the hanger means will be damaged to such a degree that frequent repair will be necessary and, secondarily, pollution of the bath will result.
However, methods were developed to protect against such damage, as mentioned below.
Present technology involves mounting a collar mould made of aluminium or cardboard about each nipple. Generally, the diameter of such a mould be twice the nipple diameter, whereas its height may vary according to separate specifications at each work, based on experience over a long time.
The collar mould is filled with granulated carbon with an addition of pitch. The collar mould will, thus, serve as a casing for the introduced composition. Mounting and filling the collar mould with composition, occurs at a point of time when anode and nipple are still hot after the hanger was moulded onto the block. Due to the heat, the consistency of the composition will change after a certain time, at least in the region closest to the nipple, so that relative strong protection against burning off is achieved.
Robotec Engineering A/S at present market an automatic machine for fully automatic mounting of collar sheets made of aluminium, as well as collar moulds of cardboard, which previously represented the latest development of the art. This known machine has a rationalization effect as well as taking over a working place having heavy environmental burdens.
As new methods were developed for purification of hanger means after the anode has burned down, e.g. as disclosed in NO-PS No. 155 893, the aluminium collar moulds proved to cause difficulties in grinding plants, transport plants, etc. In order to avoid such problems some works tried utilization of collar moulds made of cardboard. One object, obviously, was that the collar mould should burn in the furnace. Gradually, arguments were also heard against such a kind of collar moulds, because it may in certain cases burn down from below and thus loose its hold in the collar composition proper, so that the remaining portion of the collar mould is pulled up into the ventilation plant and may block the latter.
According to the invention a compression mould consisting of two sections is provided about the anode nipple(s), collar composition is, if desired in a pre-treated state, introduced into the mould and moulded under pressure, if desired by the aid of vibration and/or heat as well, and the mould sections are removed when the moulded collar composition is completely moulded. The collar composition may, e.g. be preheated by hot air and/or a binder may be added during introduction of the composition into the mould. The collar composition will, thus, achieve a consistency permitting ready finishing to a desired shape. If there are at least two nipples placed side-by-side to be provided with collars, the collars for respective anode nipples are moulded in the form of an integrated common collar for the nipples, the compression mould sections together forming an integrated mould surrounding all nipples. The device for carrying out the above method comprises a compression mould consisting of two sections which are adapted to be brou
REFERENCES:
patent: 3397429 (1968-08-01), Zavitz et al.
patent: 4017569 (1977-04-01), Hass
patent: 4119692 (1978-10-01), Durinck
patent: 4687566 (1987-08-01), Forster et al.
patent: 4756681 (1988-07-01), Unger et al.
patent: 4787965 (1988-11-01), Audras et al.
Patent Abstract of Japan, vol. 8, No. 67 (C-216 Abstract of JP 58-217686, Publ. 1983-12-17.
Robotec Engineering A/S
Valentine Donald R.
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