SU922097A1 - Refractory filler composition for lining crucibles of induction furnaces - Google Patents

Description

(54) INSULATING FIREPLACEMENT PACKAGING MASS FOR INDUCTION TIGLE LAYERS ..., I The invention relates to the production of refractory products for the protection of induction furnaces from high temperatures of gases, metal melts and slag, in particular, to the composition of refractory masses. A refractory mass is known, consisting of the following components, wt.%: Basic aggregate 30-85, finely ground acidic filler 5-6 phosphate binder 1-15.0, thermo-reactive synthetic resin 5M5 1.. The disadvantage of this mass is its low strength after drying and low durability due to landslide and lining collapse. It should be noted the heavy sanitary conditions of the occupants of labor. Closest to the proposed is a ramming refractory mass including, weight. W;; quartzite 38.4-75.0 clay; Refractory 1.6-10; aluminum chromophosphate binder 10-40 and carborundum 5-20, 2. A disadvantage of the known mass is softening at medium temperatures and low crucible durability. The purpose of the invention is to prevent the refractory mass from loosening at medium temperatures and to increase the durability of induction furnace crucibles. The goal is achieved by the fact that the printed refractory mass for lining crucibles of induction furnaces, including an aluminum-chromophosphate binder, quartzite and refractory clay, additionally contains an aqueous solution of calcium chloride in the following ratio of componentsJ wt.%: The aluminum-chromophosphate bonding agent has a clay in the following ratio of componentsJ wt.%: The aluminum-chromophosphate binder has a calcium chloride solution in the following ratio of componentsJ wt.%: The aluminum-chromophosphate binder has a calcium chloride solution in the following ratio of componentsJ wt.%: The aluminum-chromophosphate binder has a calcium chloride solution in the following ratio of componentsJ wt.%: The aluminum-chromophosphate binder has a calcium chloride solution in the following ratio of componentsJ wt.%: The aluminum-chromophosphate binding agent has a clay in the following ratio of componentsJ wt. Quartzite Else J9 When heated, calcium chloride decomposes with air oxygen and water vapor to form CaO and in the presence of S iOj and forms from the CaO-S iOj dinene. and CaOAlaO refinit), which prevents the phosphate binder from softening. In the laboratory; the conditions were prepared and tested for the proposed mass. Tests have confirmed the possibility of obtaining a positive effect. I, the refractory mass is prepared as follows. An iodine solution of calcium chloride with a density of 1.16 g / cm is prepared (solution. The CaCti solution is mixed with AHPS. The mixture of solutions is mixed. The mixture of solutions is mixed into the measured amount of quartzite and the composition is thoroughly mixed. Then the refractory clay is added and the composition is mixed again. After drying for 2–3 hours in a porn fire, the L mass is ready for use. The rest of the refractory mass was prepared in a similar way. The compositions of the mass are given in the table ..

Quartzite fraction 3-0 mm62

Aluminum Chromophosphate

binder (DHFS) 20

Clay refractory 8

Calcium Chloride Solution (

Carborundum

ten

Destructive stress at bending, kgf / mm, at a temperature of 1000 ° С

6it

Destructive stress in compression, MN / m, after drying at 350 ° С

28

Temperature of onset of deformation under load

wasps

U80

heat resistance (- air)

The change in the linear dimensions of the sample at,%

+ i.J

Seeming density, g / cm

81

72

6 17

C 12

96 38

102 CC

1580

1570 3 +1.3

Claims (2)

+1.2 592 Lower limit of water content. calcium chloride solution (3%) is due to a decrease in the temperature of the onset of deformation under load, the upper limit (6%), a decrease in the binding capacity of the mixture of solutions. The upper limit of the clay content is due to an increase in the shrinkage of the refractory mass, the lower limit is a decrease in its density, which has a negative effect on the resistance of the crucibles, especially for furnaces of industrial frequency (erosion). The lower limit of AHPS content (%) is caused by a decrease in the crucible resistance, the upper (6) increase in the moisture content of the mass, which entails the release of moisture on the multifector during the first melting. Use the proposed mass. for lining crucibles of induction furnaces, it is possible to prevent the destruction of the crucibles, in the first melts, when the thickness of the melted portion of the crucibles is still small, and a high — the mass density is combined with its low wettability | metal allows you to increase the resistance of the crucible in 1,5-2 times. Claims An inventive refractory mass for lining crucibles of induction furnaces, comprising an aluminum-chromophosphate binder, quartzite and refractory clay, which also contains an aqueous solution of calcium chloride to prevent the mass from weakening at medium temperatures and increasing the resistance of the crucibles. components, wt.%: Alumochromophosphate binder L-6 Clay, refractory 12-17, Aqueous solution of calcium chloride 3-5 Quartzite Other Information sources taken into account even during examination 1. USSR author's certificate tf 578281, cl. C 0 V.2 / 02, 1975. 2. USSR author's certificate number 663923 Cl. From 09 to 35/1, 1977.