SU983116A1 - Charge for producing refractories - Google Patents

Description

(54) CHARGE FOR PRODUCTION OF REFRACTORIES

   1- The invention relates to the refractory industry, namely to the production of high-alumina refractories used in high-temperature air heaters for blast furnaces, tunnel kilns and other thermal units of various sectors of the national economy. . The main requirement for refractories for these conditions of service is their high resistance to deformation at high temperatures. The known charge for the preparation of fire-retardant) includes, in wt.%: Electrocorundum 20-23j or not more than 5; Field-spar no more than 13.5; kaolin no more than 32.5; clay 17.8-17.9; sand 6.5-10 1. The disadvantage of this mixture is the low temperature of deformation of products under load. The closest to the one proposed is the charge for the manufacture of refractories based on high-purity alumina cheese with an AljOj content of more than 95% by weight, for example alumina, or a mixture with a material containing more than 50% by weight AljOa, for example (Iamot, taken in the amount of 85- 98 wt.% and with the addition of 2-15 wt.% high-silica material containing 75- 95 wt.% SiOj 2. The disadvantage of products made from the proposed mixture is Low deformation temperature under load of 2 kg / cm - 1630 With and increased creep at 1600 ° C and a load of 3 kg / cm - 6.7%. the invention is to improve the resistance of high temperature distortion products. The goal is achieved by the fact that the mixture for the manufacture of refractory materials, including calcined alumina, chamotte and silica-containing component, contains less than 3 mm chamotte fraction, and the silica-containing component is quartz sand less than 3 mm. , 5 mm in the following ratio, wt.%: Burnt alumina4.1 -70 Fireclay fraction less than 3 mm 2 40

39831164

Quartz sand is less at ISSO-ieSOC temperature with the top

0.5 mm17-286ch

Moreover, the mixture contains quartz sand. The composition of the mixture and the properties of the obtained fraction of less than 0.5 mm unmilled, i.e. The products are shown in the table, the technologists exclude the grinding of quartz sand. can be seen from the table, creep products

To obtain samples of the refractories of the prepared composition of the proposed composition at a temperature

in t of the charge on the proposed and well-known 1600 ° C and a load of 3 kg / cm for 24 hours is very composition Products (normal kirtichi is formidable and amounts to 0.018-1.04% of pro-

mat) is made by pressing on hydravoid 6.7% for products of known charge,

At specific pressures, the press also has a higher starting temperature.

500 kg / cm and burn in the furnace furnacedeformation.

The composition of the charge

Fireclay less than 3 mm kaolin content of 42% A12Oz.

Mullite chamotte with a content of 72%

Mullam-korundovy chamotte with a content of 85%

Technical alumina

70 burned, less than 10 microns

Unmilled quartz sand, less than 0.5 mm

Property indicators A12Oz content,%;

Porosity is open,%

The temperature of the onset of deformation p / n 2 to g / cm. C Strength at 12451314 compression, kg / cm

Creep,%, at 1600 С, п / н

3 kg / cm in 24 hours

Claims (1)

The formula of the invention for the manufacture of refractories, including calcined alumina, chamotte and cream20 40 thirty 20 43 50 58 58 17 20 22 22 7266 72 72 20,818,8 14.5 11.6 17501750 17501750 1540 1,040.39 0.10 0.046 Ezem-containing coltonent, characterized in that, in order to increase steadily4; these products to high-temperature defo | 1370-1620-1040875164015071020 5983116 6 matsii, it contains chamot fraction less than Quartz sand fraction 3 mm, and as a silica-containing less than 0.5 mm 17-28 component - quartz sand fraction less sources of information, 0.5 mm in the following ratio of components taken into account during the examination Nanos wt.%: 51- USSR Copyright Certificate ff 183661, Burnt alumina 43-70kl. From 04/35/18, 1964. Fireclay fraction less than 2. Japanese patent N 53-13642, cl. C 04 V 35/18, 3 mm 2-401978.