Process and plant for producing a lining on the inner walls of a

Details Process and plant for producing a lining on the inner walls of a Process and plant for producing a lining on the inner walls of a

1990-12-21

1992-11-03

Kastler, Scott

Metallurgical apparatus

Process

266281, 264 30, B22D 4102

Patent

active

051606925

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a process for producing a lining on the inner walls of a metallurgical vessel intended to receive liquid metal.
The present invention also relates to a plant for making use of the abovementioned process.
A number of processes for producing a lining on the inner walls of a metallurgical vessel are known.
Thus, for example, there is known, according to the Applicant Company's French Patent 2,393,637, a process in which an aqueous and pasty mixture capable of setting, containing inorganic particles, optionally fibres, and an organic and/or inorganic binder, is applied by moulding, tamping or projecting with the trowel or pneumatic or other projecting to the inside of a metallurgical vessel such as a casting tundish. The mixture of particles sinters in contact with the liquid metal, and this ensures the cohesion of the lining.
According to French Patent Applications 2,585,273, 2,613,256 or 2,619,323 in the name of the Applicant Company there is also known a process according to which at least two layers of different compositions are applied to the inside of the metallurgical vessel, each being applied by projecting an aqueous and pasty mixture capable of setting of the abovementioned type.
These processes, which otherwise give the users complete satisfaction, nevertheless present a disadvantage: at least all the wetting water employed for forming the aqueous mixture(s) must be removed by drying, and this involves an immobilization time and an expenditure of energy, neither of which can be ignored.
There is also known a process according to which a template is placed inside a metallurgical vessel, a material consisting of refractory particles and of a heat-curable binder is projected pneumatically between the template and the inner walls of the vessel, and heating is then applied while the template is left in place to cause the binder to set, and the template is finally removed. The cast material contains an inorganic compound containing water of crystallization.
According to other known processes requiring the use of a template, the material of the abovementioned type is compacted between the template and the inner walls of the vessel, either by tamping or by vibration or by impacts.
The use of a template, which in some cases must be left in place, always causes a loss of time and is a source of expenditure due to the handling and the adjustments which it requires.
Moreover, heating the material through the template represents a certain consumption of energy and an additional time of immobilization of the metallurgical vessel.
Finally, if the material is deposited onto a permanent protective lining which is already worn, the use of a template which imposes a uniform outer profile of the lining results in the installing of a layer of material whose thickness is greater than that necessary, and this causes an excessive and useless consumption of this material.
The aim of the present invention is to overcome the disadvantages of the known processes and to propose a process which is simple, rapid and economical to employ and which is particularly well suited to the production of the wear lining of a metallurgical vessel.
The aim of the present invention is also to propose a plant for making use of the said process.
According to the invention the process for producing a lining on the inner walls of a metallurgical vessel intended to receive liquid metal is characterized in that it comprises the following stages:
a) a metallurgical vessel whose inner walls to be lined are relatively hot is placed on a suitable support;
b) the support is tilted and the metallurgical vessel is brought successively into a number of different positions, in each of which an inner wall or a part of wall of the vessel is substantially horizontal and turned upwards;
c) in each of the abovementioned positions at least one layer of a substantially dry material comprising a mixture of refractory particles and a binder of the thermosetting or equivalent type is spread on the said inner wall or part of wall, the

REFERENCES:
patent: 4696455 (1987-09-01), Johnson

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