CS242150B1 - Stirring silicate mixture - Google Patents

Abstract

The mixture contains crushed or ground quartz glass, dinas, unburnt silica material and a silica binder, formed by a hydrosol of silica. Part of the binder may be formed by phosphorus pentoxide or 50 to 100 Jo orthophosphoric acid or ammonium phosphate or sodium phosphate in an amount of 0.5 to 4% by weight. The use is considered mainly in metallurgy and glassmaking.

Description

The invention relates to a tamping repair silica mixture comprising crushed and/or ground silica glass, dinas, unburnt silica material and a silica binder formed by a silica hydrosol.

For silica tamping mixtures, silica components are used, such as silica glass, and/or burnt dinas, and/or quartzite and/or other unburnt silica material, etc. Water glass, Portland cement and silica hydrosol are used as binders, but the first two binding components contain components that reduce the refractory properties, and thus the refractoriness, especially in corrosive environments. Although silica hydrosol provides the mixture with good refractory properties, the strengths at temperatures up to 1,200 °C are very low.

The above-mentioned shortcomings are eliminated according to the invention by a tamping and repairing silica mixture containing crushed and/or ground silica glass, dinas, unburnt silica material and a silica binder formed by a silica hydrosol. Its essence lies in the fact that it contains phosphorus pentoxide and/or 50 to 100% orthophosphoric acid and/or ammonium phosphate and/or sodium phosphate in an amount of 0.5 to 4% by weight, forming part of the binder.

The basic effect of the tamping and silica mixture is to improve its strength, while the refractory properties, such as its resistance to heat deformation under load, are maintained.

The tamping and repair mixture is described in the following examples.

Example 1

A repair mixture was made, containing 100 g of crushed and

242 150

- 2 ground quartz glass, 8 g of silica hydrosol and 2 g of 100% H3PO4. During application, the compressive strength after firing at 100 °C was found to be 5 MPa, at 400 °C 8 MPa and at 1,200 °G 13 MPa. The resistance to deformation in heat at a load of 0.2 MPa was tg 5 = 1,690 °C.

Example 2

A repair mixture was prepared containing 55 g of crushed dinas, 45 g of finely ground quartz glass, 7 g of silica hydrosol and 3 g of /NH4/H2PO4. During application, the compressive strength after firing at 100 °C was found to be 2.5 MPa, at 400 °G 6 MPa and at 1,200 °C 12 MPa. The resistance to deformation in heat at a load of 0.2 MPa was t _Q}6 = 1,650 °C.

A comparison of the mixture according to the invention, containing 8% of silica hydrosol and 2% of H3PO4, with a mixture containing 8% of silica hydrosol, demonstrated better strength properties and a somewhat higher bulk density, as can be seen from the overview below.

mixture with 8% mixture with 8% hydrosol of silica hydrosol of silica and % H3PO4

resistance to deformation in heat at a load of 0.2 MPa compressive strength after firing 1,690°C 1690°C at 100 °C 1.5 MPa 5 MPa 400°C 3 MPa 8 MPa 1200°C 9 MPa 13 MPa Dry density at 100 °G in /g.cm“3/ 1.65 1.68 after firing at 1 2Q0 °C 1.62 1.65

The mixture can be diluted with water to achieve the appropriate consistency.

The above mixtures can be used for stamping linings or their parts, especially in contact with dinas and/or zircon. They can also be used for repairs of dinas and zircon linings. The use will be mainly in metallurgy and glassmaking.

Claims (1)

SUBJECT OF THE INVENTION 242 150 A ramming and repairing silica composition, containing crushed and / or ground quartz glass, dinas, unfired silica and silica hydrosol, characterized in that it contains phosphorous pentoxide and / or 50 to 100% orthophosphoric acid and / or ammonium phosphate and / or phosphate sodium in an amount of 0.5 to 4% by weight, said part of the binder.