Refractory ramming mass

 

(57) Abstract:

Usage: the invention relates to refractory industry and can be used for mass production for printed thermal units performed using iscomet. Task: production of refractory ramming mass with increased shelf life and reduced consumption of phosphoric acid. The inventive mass contains, wt%: high-alumina component 81 - 85; refractory clay 7 - 12; a mixture of an aqueous solution of orthophosphoric acid 40 to 50% concentration and 30% aqueous urea solution in the ratio of 70:30 - 7-10. table 1.

The invention relates to AMIS for printed thermal units performed using iscomet.

Known refractory ramming mass, containing highly aluminous chamotte, corundum waste abrasive production, refractory clay, sodium polyphosphate and phosphoric acid [1]

The disadvantages of this mass are limited shelf life and the use of expensive and scarce orthophosphoric acid.

Closest to the invention is a refractory mass for beskonechnoi gaskets containing phosphoric KIS is icandy of shelf life from the beginning of creation until the application (not more than 3 months) and the use of expensive scarce orthophosphoric acid.

The task of the invention is the creation of a refractory ramming mass with increased storage time from the start of manufacturing to applications in which the introduction as a binder a mixture of an aqueous solution of orthophosphoric acid and urea solution provides increased shelf life weight from the start of manufacturing to use and reduce consumption from orthophosphorous acid, while maintaining the strength of the lining of thermal units.

The task is solved in that the refractory ramming mass, including vysokoglinozemistyj component, refractory clay and a binder according to the invention contains as a binder a mixture of an aqueous solution of orthophosphoric acid 40 to 50% concentration and 30% aqueous urea solution in the ratio of 70:30 in the following ratio, wt.

High-alumina component 81 85

Refractory clay 7 12

The specified binder 7 10

The presence of a binder along with a solution of orthophosphoric acid solution of urea reduces the intensity of the interaction of the binder with fine-grained component of the mass, usually accompanied by an exothermic reaction with evolution of heat, which in turn prevents rapid drying of the mass and uvely ramming mass is carried out in a mixing unit, downloading in predetermined quantities first high-alumina component, then the mixture is an aqueous solution of orthophosphoric acid 40 to 50% concentration and 30% aqueous urea solution in the ratio of 70:30, and then add refractory clay. The total mixing time 7 10 min. Weight comes in ready to use form.

In Ukrniio were tested following compositions wt.

1. Prototype: high-alumina component with the content of Al2O3not less than 58% 83, refractory clay 90, phosphoric acid 8,0.

2. Offer (optimal): high-alumina component 83, refractory clay of 9.5, a mixture of an aqueous solution of orthophosphoric acid 40-50% concentration and 30% aqueous urea solution in the ratio of 70:30 is 8.5.

3. Offer (limit): high-alumina component 81, refractory clay 12, a mixture of an aqueous solution of orthophosphoric acid 40 to 50% concentration and 30% solution of urea in the ratio of 70:30 7.

4. Offer (limit): high-alumina component 85, refractory clay 7, a mixture of an aqueous solution of orthophosphoric acid 40 to 50% concentration and 30% aqueous urea solution in the ratio of 70:30 8.

5. Offer (limit) vysokogorii and 30% aqueous urea solution in the ratio of 70:30 10.

6. Beyond: high-alumina component 78, refractory clay - 15, a mixture of an aqueous solution of orthophosphoric acid 40 to 50% concentration and 30% aqueous urea solution in the ratio of 80:20 5.

7. Beyond: high-alumina component 87, refractory clay - 4, a mixture of an aqueous solution of orthophosphoric acid 40 to 50% concentration and 30% aqueous urea solution in the ratio of 60:40 9.

8. Beyond: high-alumina component 80, fire clay - 8, a mixture of an aqueous solution of orthophosphoric acid 40 to 50% concentration and 30% aqueous urea solution in the ratio of 80:20 12.

The results are given in the table.

As can be seen from the table, the weight of the proposed structure (examples 2 to 5) are characterized by an increased shelf life compared to the prototype, and relatively high resistance of the lining.

The mass of the proposed structure is scheduled for release in Semiluki refractory plant in 1992 in the amount of 5000 tons

Mass will be used to perform the padded lining of casting ladles used in the steel casting with out-of-furnace treatment.

Refractory ramming mass, including high-alumina component, Ogneupory is a mixture of an aqueous solution of orthophosphoric acid 40-50% concentration and 30% aqueous urea solution in the ratio of 70 to 30 in the following ratio of components, wt.

High-alumina component 81 85

Refractory clay 7 12

The specified binder 7 10l

 

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FIELD: non-iron metallurgy, in particular cladding of metal plunge.

SUBSTANCE: claimed refractory concrete contains (mass %): corundum mass 82-85; high-aluminous cement 4-5; electrical filter dust from silicium production 4-5; phosphoric acid 2-3; and water 3-4. Method for cladding manufacturing using the said concrete includes former installation into plunge; charging of refractory concrete into space between plunge internal wall and former, vibratory compaction, and two-step drying: at first at 20-250C for 5-7 days and then by graduated heating and drying. Namely, at first cladding is heated up to 1500C with rate of 6-80C/h and kept for 9-11 h; then cladding is heated up to 4000C with rate of 13-150C/h and kept for 14-16 h; then cladding is heated up to 6000C with rate of 20-220C/h and kept for 10-12 h. Cladding obtained by claimed method stands on silicium refining plunge up to 90 air thermal cycling.

EFFECT: cladding of improved strength.

2 cl, 4 tbl, 1 ex

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