Mining or in situ disintegration of hard material – Processes
Patent
1988-04-25
1989-10-03
Massie, Jerome W.
Mining or in situ disintegration of hard material
Processes
151041C, 266281, 299 70, B08B 900, C21B 714
Patent
active
048712116
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the treatment of refractory linings, which in use come into contact with an erosive substance such as molten metal or glass. The linings may be present on part or all of the surfaces of various items of industrial equipment, for example, runner channels, ladles, torpedo cars, electric arc furnaces, especially the inlet and outlet, tundishes, and the like. For convenience, the invention will be described with reference to the reconditioning i.e. restoration for use of a refractory lined transfer channel, for example a blast furnace runner channel which extends between the furnace and a receptacle, e.g. a ladle, torpedo car or tundish. Such a channel tends to be of generally -U- cross-sectional shape, having a floor and side walls, a lining of refractory concrete being present on the interior of the channel. After molten metal is poured along a transfer channel, a residue is left on the floor and lower region of the side walls. As it solidifies, the residue tends to bind to the refractory concrete. The heat of the molten metal can also damage the refractory lining. The residues must be removed before the transfer channel is used again, often while the channel is still hot and the residues are still red, and this removal is difficult and inconvenient to do, irrespective of whether the work is done manually or using machinery. The restoration work is time consuming, often days, dirty and dangerous.
It is one object of this invention to provide a method and apparatus for use in carrying out the restoration work of such a refractory lining, which is efficient and yet will take less than one working day usually in a matter of hours to perform.
According to one aspect of the invention there is provided a method of restoring a refractory lining for a repeat use, the lining being present on an underlying wall surface, the method being characterized by milling the lining to expose sound clean underlying wall surface, and removing the milled off pieces, fine particles and dust, whereby the underlying wall surface is speedily available for relining and reuse.
In the method, a rotary milling head is urged with rotation along the side wall for a length of about two to three meters and this step is repeated until the total length of the side wall has been milled. Preferably several passes are made to mill each length. As a result of the milling, a large amount of material is released, and this can be removed using a bucket but there are many fine particles and much dust and these are preferably withdrawn by blowing or sucking them away.
While the method steps can be performed manually, for speed, safety and efficiency it is much preferred that the method is performed using a vehicle having caterpillar tracks spaced apart so that one is on each side of the channel, the vehicle also having an arm at the working end of which are releasable coupling means adapted to release or engage one of a set of tools comprising a chisel, a milling tool and a bucket (for the removal of detached residues), and the appropriate tool is coupled to the working end of the arm as required. In a preferred feature each of the tools has latching means adapted to engage complementary latch means at the working end of the arm.
The vehicle preferably includes means for heat insulating and cooling the vehicle when used on a hot channel. Preferably the arm is short and capable of universal movement in any direction so that the tools may reach all parts of the side wall e.g. channel.
For increased stability so that the method may be performed at high speed the vehicle includes a motor and hydraulic system sufficient to provide power to move the vehicle, to actuate the arm and to provide rotation of the milling head, the motor being located on the vehicle so as to provide a low centre of gravity whereby the vehicle and the arm may be moved rapidly.
It will be appreciated that in many cases, e.g. the runner channel, the lining is present on opposite side walls and on the floor. In such a case, extra steps must be taken to treat the
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Bagnell David J.
Massie Jerome W.
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