Method and installation for spraying a multi-layer insulating refractory coating, and the coating thus obtained
AssigneeDaussan et Compagnie
InventorsJean-Charles Daussan, Gerard Daussan, Andre Daussan
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Abstract
A method and installation for applying an insulating refractory coating comprising at least two layers of equal of unequal thickness, of different compositions and equal or different water contents, onto surfaces such as the interior of metallurgical vessel (1). At least two aqueous pasty hardenable products are successively applied to the surfaces. In the case of each layer of different material, the corresponding products, which are pulverulent and/or fibrous, are successively supplied, continuously or discontinuously, through a single means (10) for spraying the surface to be coated.
Claims25
In a method of applying an insulating refractory coating made up of at least two layers to interior surfaces of metallurgical vessels (1) in which at least two different aqueous pasty hardenable products each prepared by mixing with water a respective set of grainy, pulverulent or fibrous constituents or mixtures thereof are successively applied in successive layers to said surfaces;
- the improvement in which for each successive layer of different product, the respective aqueous pasty hardenable product is prepared as a ready-for-use mixture by mixing with water said respective set of grainy, pulverulent or fibrous constituents or mixtures thereof, then is pumped and supplied to a single means (11) for spraying onto the surface to be coated.
In an installation for applying an insulating refractory coating comprising at least two layers onto interior surfaces of metallurgical vessel (1), in which at least two different aqueous pasty hardenable products each prepared by mixing with water a respective set of grainy, pulverulent or fibrous constituents or mixtures thereof are successively applied in successive layers to said surfaces by the installation;
- the improvement in which the installation comprises first and second pairs of tubular members (3, 5;
- 3a, 5a) each containing a respective metering spiral conveyor (4, 4a) and a rotating mixing and conveying means, and means for supplying each pair of tubular members (3, 5;
- 3a, 5a) with the solid constituents of each layer to be formed, said second tubular members (5, 5a) each comprising a water inlet (7, 7a) connected to means (8) for continuously supplying the tubular members with a quantity of water necessary to obtain a pasty consistency for each layer, and means for feeding a resulting aqueous pasty hardenable mixture coming from the two tubular members (3, 5) in the first pair or from the other two tubular members (3a, 5a) to a pump (9) connected to a single pipe system (10) for spraying the mixture.
Dependencies are inferred from the claim text.