SU983118A1 - Charge for producing refractory articles - Google Patents

Description

(54) FIELD FOR PRODUCTION OF REFRACTORY PRODUCTS

The invention relates to compositions of refractory mixtures for the manufacture of dense refractory products and can be used in engineering industry. Fireproof mixtures and masses 1 are known that include wt.%: Calcined zircon briquette of fraction 2-0.2 mm19.0-20.0 fraction less than 0, 1 mm 19.0-20.0 Zircon concentrate 38.0-40.0 Orthophosphoric acid 8.0-16.0 Refractory clay8.0-9.0 The disadvantage of the material from this shell is its insufficient resistance to sudden temperature differences low erosion resistance. The closest to the proposed by the technical essence and the achieved result is a refractory mass of 2J, vyupo1uyu wt.%: Circo concentrate 40-60 Graphite25-35 Aluminum hydroxide 5-10 Alumochromophosphate due to 10-15 However, the material from this refractory mass has insufficient heat resistance and strength. The purpose of the invention is to increase the heat resistance and mechanical strength. This goal is achieved by the fact that the charge for the manufacture of refractory products, including zirconium concentrate, aluminum hydroxide and aluminum chromium phosphate compound, additionally contains silicon carbide. In the following ratio, wt.%: Zircon concentrate 40-60 Aluminum oxide hydrate 3-5 Aluminochromo phosphate 7-10 Silicon carbide 30-45 Ave than a car & there silicon has the following fractional composition, wt.%; 1.6-0.8 mm 50%, 0.5-0.2 mm 50%.

The introduction of silicon carbide into the charge contributes to the formation of refractory and heat-resistant zirconium and silicon phosphates resistant in liquid slags with a high content of about 1} iron words. .

The mixture is prepared as follows.

A zircon concentrate is loaded into a mixer, silicon carbide and alumina hydrate are poured, the components are mixed in a dry one for 2-3 minutes until a homogeneous mixture is obtained. POOLS are added

Shrkon concentrate

45

Alumochromophosphate binder

 alumina graphite

Silicon Carbide:

Predbl. Strength pr compression, kg / tM

350

1750

Fire resistance

Thermal stability amount of tesismep (laOOC water)

20

an aluminum chromophosphate binder with a density of 1.3 g / cm and stirred for 35 minutes.

From the mixture thus prepared, compact monolithic articles are pressed, for example bushings for high-frequency installations. The finished products are dried at a temperature of 150-250 ° C, then burned in a chamber furnace at a temperature of 950-1000 C (low-firing products)

The composition of the proposed mixture and the properties obtained from these products in comparison with the known are presented in tables 1 and 2.

Table 1

40

60

50

ten

IN 3

7 3

five

Table 2

950

915

975

1850

1750

1800

50

50

50

Claims (2)

1. The mixture for the manufacture of oraeynoifflbix products, including zirconium concentrate, alumina hydrate and an aluminum-chromophosphate binder, characterized in that, in order to improve thermal stability and mechanical strength, it additionally contains silicon in the following ratio of components, wt.%: Tsi1zhonovs concentrate 40-60 Aluminum oxide hydroxide 3-5 Alumochromophosphate binder 7-U Silicon Carbide 30-4S 2. The mixture according to claim 1, about t h h and y and the fact that silicon carbide has the following fractional composition, wt.%: 1.60, 8 mm - 50%, 0.5-0.2 mm - 50%. Sources of information taken into account during testing 1. USSR author's certificate №424841, cl. From 04 to 35/48, 1974. 2. Authors certificate of the USSR N 668924, cl. From 04 to 35/48, 1978.