SU51411A1 - The method of obtaining carborundum refractories - Google Patents

Description

Typically, the manufacture of carborundum refractories is carried out by burning a preformed raw material from a mixture of carborundum grains of various sizes and refractory plastic clay.

The products obtained in this way are characterized by a low temperature for the onset of softening under a load not exceeding 1500 °.

Methods have been proposed for raising the temperature of the onset of softening by adding clay and quartz to carborundum.

However, according to the data available in the literature, in a similar way, although some increase in the softening onset temperature is achieved, it is also necessary to bake the products at a temperature close to 1500.

/ The author has found that it is possible to manufacture carborundum refractory products not on a clay or quartz – clay bond, but on a quartz-limestone product, introducing a finely dispersed mixture of quartz and calcium oxide into the carborundum mixture. Applying a similar charge, the author (for his work) received

Carborundum products with the following indicators:

temporary compressive strength. 750 kg / s. Water absorption 11 .6%

porosity24.80, (,

bulk weight 2.14

ZK40 fire resistance

temperature of onset of deformation

under load of 2 kg / cm1600

thermal conductivity at BOO. Cal./9.04.I h. C

In order to give strength to the dry raw, an additive to the batch of some kind of binder, such as sulfite liquor, dextrin, molasses, etc., is necessary.

The quality of the obtained carborundum products, as can be seen from the above indicators, is high. When working on the proposed method in the form of a quartz component, quartzites, quartz sand, vein quartz, sandstone, etc. can be used with appropriate quality.

Calcium oxide can be introduced in the form of hydrated lime, burnt lime, chalk, limestone, and other calcium oxide-containing compounds.

The subject matter of the invention.

The method of producing carborundum refractories, characterized in that

A finely divided mixture of quartz and calcium oxide is used as the binder of the carborundum mass.