Forming refractory masses

Details Forming refractory masses Forming refractory masses

B - Operations, Transporting

28

B

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B28B 19/00 (2006.01) B05B 7/14 (2006.01) C23C 4/12 (2006.01) F17D 1/16 (2006.01) F27D 1/16 (2006.01)

Patent

CA 1292609

ABSTRACT When forming a refractory mass on a surface a mixture of oxidisable particles and refractory particles in a comburent carrier gas is sprayed against that surface from an outlet of a lance. Thus, on combustion of the oxidisable particles, sufficient heat is generated to soften or melt at least the surfaces of the refractory particles to bring about the formation of the refractory mass. The mixture of particles is itself mixed with a carrier gas stream, for example using venturi, and is fed along a line towards the lance outlet. Oxygen is introduced into such feed line at at least one location therealong and is mixed with the carrier gas/particle mixture during its flow towards the lance outlet, before reaching that outlet, and preferably at least 1 metre from the outlet of the lance. The addition of oxygen may take place via a connector having an annular orifice which is provided in the feed line in a zone where the feed line increases in cross-sectional area, and which is aligned axially of the feed line.

517586

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