SU729161A1 - Refractory composition for lining heating plant - Google Patents

Description

The invention relates to refractory materials and can be used in the metallurgical industry for lining thermal units, casting ladles and blast chutes. A known refractory mass for lining thermal units, including a phosphate bond, electrocorundum and clay 1. The disadvantage of it is low strength. In addition, the known charge for the manufacture of refractory material, including electrofused corundum 9-73, boron nitride 15-67, refractory clay 7-14 and alum-chromophosphate bond 5-10 2, has the disadvantage of low mechanical strength and stability in molten steels and cast iron. The purpose of the invention is to increase the mechanical strength and stability in molten steels and cast iron. This is achieved by the fact that the refractory composition for lining thermal aggregates, including a. Aluminum-chromophosphate binder, electro-crushed corundum, boron nitride and refractory clay, additionally contains aluminum hydroxide in the following ratio components, wt.%: Alumochromophosphate binder Boron nitride Refractory clay Aluminum hydroxide Rest: Electroalted corundum The refractory mass is prepared as follows time. Pre-mixed in the mix-, solid dry powders of electrofused corundum, boron nitride and alumina. Then refractory clay and 1 cismochromophosphate binder are added and mixed to obtain a homogeneous mass. The mass is filled with pneumo-electric ramming or manually and held in air for 24 hours. Then drying is carried out with gas burners for 20-30 minutes. The amount of the alumochromophosphate1 binder should not exceed 30 wt.%, Because otherwise packing is difficult. The properties of the obtained refractory ramming mass are given in table.

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Claims (2)

Invention Formula Refractory composition for lining thermal units, including an aluminum-chromophosphate binder, elect {) melted corundum, boron nitride and refractory clay, so that it contains, in order to improve mechanical strength and stability in molten steels and cast iron additionally aluminum hydroxide in the following ratio of components, wt.%: Alumochromophosphate 10-30 binder Boron nitride 5-30 Fire Clay 4-6 Aluminum hydroxide 3-5 Electroplating Else. corundum Sources of information taken into account in the examination 1, Copyright testimony of the USSR 369109, c. 04 in 35/10, 1971. 2. USSR author's certificate No. 2591074 / 29-33, class C 04 B 29/02, 1978.