(1) Explanation: The refractory spraying coating is a kind of amorphous refractory which is made up of reasonable gradation refractory aggregate, powder, binder and additive, and is suitable for spraying construction with special spraying machine.
A. can smoothly and steadily pass through the conveying hose without blockage of the pipeline.
B. has strong adhesion and little loss in springback.
The composition and distribution of C. coating are uniform.
D. drying shrinkage is small.
E. setting time is short and hardening speed is fast.
(3) the location of use:
A.FN-130 spraying coating is used for the parts below the throat and protective plate of blast furnace, the middle and lower part of the hearth, the inside of the iron sheet of the furnace body, the middle and upper high temperature zones of the regenerator, the inside of the iron sheet of the value cylinder of the combustion chamber, the hot air outlet, the high temperature zone of the upper section and the dry quenching coke oven.
B. FH - 140 spraying coating is used for the waist of blast furnace, the inner wall of hot blast furnace outlet pipe, mixing chamber close to the inside of iron sheet, and the inside of hot blast main pipe.
C. other grades of spray coating are suitable for thermal insulation and working layer of all kinds of thermal equipment.
linear changeafter heating,%
Max.service temperature, ℃