SU578286A1 - Charge for manufacturing refractory articles - Google Patents

Description

one

The invention relates to the manufacture of refractories resistant to the effects of steels, alloys and slags, such as glasses for feeding metal into the mold below the level, and can be used in the refractory and metallurgical industries.

Known metal pipes from sintered silicon oxide and its compositions with other materials 1.

However, such products, especially those made with a horizontal metal supply, have insufficient slag and metal resistance when casting ordinary and alloyed steels.

The closest to the invention according to the technical solution are graphite-alumina-silicon carbide refractories 2. The latter contain the main components in the following amounts, wt. %:

Alumina or corundum 60-80

Graphite 10-38

Silicon Carbide 2-18

Silicon1-7

Binder (carbonaceous matter) Else

Slag and metal resistance of products prepared from the specified composition is insufficient, since it ensures casting no more than 200 tons of aggressive alloyed steel. The purpose of the invention is to increase the strength

and erosion resistance of products.

This is achieved by the fact that the known composition of the mixture, including alumina-containing filler, graphite, clay, silicon carbide, silicon, and a binder as the alumina-containing component, contains dust from a rubber catalyst in the following ratio of these components, wt. %: Rubber catalyst dust

production50-67

Clay8-16

Silicon Carbide 3-8

Silicon1-7

Graphite 20-30

Binding1-5

As a binder, you can use various organic or inorganic materials: sulphite-alcohol barda. aluminum chromophosphate binder, methylcellulose, coal tar, pitch, etc.

In the manufacture of products from the mixture of the proposed composition, the rubber of a rubber production catalyst is briquetted, calcined at a temperature of 1580 ° C with a holding time of 6 hours, crushed and scattered into fractions of 2-0.5 mm and less than 0.06 mm (coarse fraction is 30 - 37%) The components of the mixture are mixed in a ball mill, moistened on runners, then from

the prepared mass is molded into articles by isostatic pressing at a pressure of 1000 MPa with preliminary vibration-vacuum compaction. Roasting products is carried out in

reducing atmosphere at a temperature of 1430 ° C.

The composition of the charge and the properties of products from them are given respectively in Table. 1 and 2.

Table 1

As can be seen from the table, the strength value (195 - 330 kg / cm) and slag resistance (erosion of 2.2 - 9.0 wt.%) Of samples made using catalyst dust significantly exceeds the same values (160 kg / cm2 and 15 % - respectively) for samples made from the use of a known composition. These properties make it possible to obtain refractories of higher quality, such as glasses for feeding metal into the crystallizer under the level.

Claims (1)

1. US patent No. 2772176, CL. 105-56, published. 1956 578286