SU509559A1 - The method of manufacture of corundum products - Google Patents

Description

The invention relates to the technology and the preparation of fused-cast refractory products and can be used in fireproof production. A known method of manufacturing molten cast refractories, including melting the charge, pouring the melt into molds. subsequent cooling, out of shape. The disadvantage of this method is the duration of the technological process, the occurrence of trynins in the castings and the low quality of the surface of the latter. The purpose of the invention is to eliminate these disadvantages, as well as to shorten the technological process. The goal is achieved due to the fact that the casting is kept in 4юрrme before it acquires mechanical strength sufficient for transportation (1-1 мин min depending on the size of the casting). after which it is freed from the mold and cooled according to the Y (2OO / H) regime. degrees / hour where f is the cooling rate of the casting with a thickness of 1OO-ZOO mm, H is the minimum thickness of the casting in mm, is the cooling rate of the casting with a thickness of 20O mm, and is within the range of ISOO-j 100-50 degrees / hour G14bOd-130O 50-30 - 13b6- 12OO 30-2 O --- 12OO-1OOO 8-12 --- 1OOO - 800 1O-15 -15-20 -800 - 6OO 20-40 - -60O - 40O 40-50 -4OO - 5O The method is carried out as follows: the mixture containing, for example, 93-97% StO and no more than 2% approx. Oz, is melted, poured into cast-iron or raffit molds and maintained prior to purchase by casting with a 1 st mechanical strength enough to transport 1-10 min) . For example, 1 eGglivki size OOZHZOOh2OO mm - 3-5 minutes

The obtained first furnace with a temperature of up to ISOOX for conducting controlled annealing, and which is the final aa i paeBauMe of the casting (after 40 -60 minutes after the casting into the molds) and cooled according to the above regime.

Formula takes bret @ nn

The method of preparation of the bark d {p1h ka & wz toltyoy 1OO-ZOO mm chickens n asn0HHa; -V aanitBKH melt on the subsequent holding i of the melt. in the form and cooling down outside of us, distinguished by the fact that: in order to reduce the technological progress and improve the quality of the hedges, the ebb - | jg ku withstand in xfmf for 1-10: mnn, then cooled according to the mode

(2OO / Н) УО degree / hour, where

Y — fast OA; 1) the thickening of SOZO mm and H are minimal;

The cooling rate of the casting is 2OO mm thick;

the interval 15OO 10O-SO,

V time and

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