CS216877B1 - Unburnt molded or unshaped refractory material based on calcined or unburned silica raw materials - Google Patents

Abstract

The invention relates to the field of refractory acidic building materials and solves the processing of acidic raw materials and especially unusable waste from the production of dinas by chemical or physico-chemical consolidation, which replaces firing. The essence of the invention lies in the fact that granulometrically adjusted unfired or fired siliceous raw materials are mixed with fillers (expanded polystyrene, experlite, diatomite, with substances favorably affecting the voids of the mass (fine siliceous materials) and chemical or ceramic binders (phosphate solutions, water glass, hydraulic binders). After mixing, they are shaped and allowed to harden. The material according to the invention is produced in a heat-insulating and dense assortment and is intended for linings of various thermal aggregates, especially as a substitute for dinas.

Description

The invention relates to the field of refractory construction materials and to the production and processing of acid refractory raw materials and, in particular, waste from the production of dinas. These acid refractory materials can be used to produce refractory linings either as prefabricated products or for nailing, vibrating and casting on site. This can replace the advantageous construction of classic dinas or other refractory bricks. The invention solves the assortment of these building materials in both the dense and insulated heat-insulating assortment.

To date, dinas is produced by a ceramic process by crushing and grinding the silica raw material, then mixing it with 2-3% lime milk, forming, drying and firing at a temperature of about 1450 ° C. The burning of large and complicated shapes results in a high proportion of underfires due to modifications.

The heat-insulating dinas are produced by the same process, with a burnout additive, e.g. coke, which, as a result of the ash and flux content, reduces the thermo-soft properties of the product and increases the under-yield.

Other siliceous raw materials such as e.g. sands are treated by the same process, making up only part of the basic raw materials.

These ceramic processes are costly and energy intensive.

1. Cement Portlan dinas grit up to 4 mm Expanded polystyrene up to 3 mm Bulk density after drying Bulk density after firing at 1300 ° C Strength after drying Linear firing changes

2. Sodium water glass - Trade, quality Sodium fluorosilicate Dinasic grit up to 4 mm Bulk density after drying Bulk density at 1350 ° C Burning strength Burning strength at 135 ° C t _m tr

3. Phosphoric acid 85% dinasic pulp up to 4 mm ground quartz below 0,1 mm density after drying Compressive strength after drying

The processing of dinas sub-products occurs only partially and after their crushing and grinding they are re-added to the dinas masses. Their contribution to the additive is limited, since the addition of crushed scarfs deteriorates the physical properties of the building material. Also, the processing of other acidic raw materials into shambles is limited by standardized SiO ₂ content parameters.

The above-mentioned drawbacks are eliminated by an unburned shaped or unformed refractory based on fired or unburned siliceous raw materials, which consists essentially of 20 to 95 wt. granulometrically ground pulp consisting of dinas, burnt or unburned siliceous raw material and 3 to 40% w / w; 2 to 40 wt. binders such as water glass, phosphates, phosphoric acid and the like.

Strengthening is achieved here by chemical or chemical-physical bonding. By this method, it is advantageous to treat the dinas production for which it has not been adequately utilized.

The products prepared by this process can serve as a substitute for dinas or chamotte masonry, both in metallurgical and thermal insulation products.

These materials exhibit the following characteristics:

wt. parts by mass parts by mass parts

100

1.42 Mgm ^{1 2 3}

1.28

5.6 MPa + 0.2 wt. parts

1.5 wt. parts

83.54 wt. parts

100

1.65 Mgm- ³ 1.53 Mgm- ³

MPa

MPa

1520 ° C

1596 ° C wt. parts by mass parts by mass parts

100

1.82 Mgm ³

MPa

Products according to the invention having heat-insulating properties can be used to insulate the vaults and walls of the blast furnace, glass, ceramic and metallurgical furnaces and dense materials by replacing or repairing the dinas or other refractory parts of the thermal aggregate walls.

Claims (3)

1. Unfired shaped or unshaped refractory based on calcined or unburned siliceous raw materials, characterized in that it consists of 20 to 95% by weight of granulometrically ground pulp, consisting of dinas, fumed or unburned siliceous raw material and from 3 to 40% by weight. and 2 to 40% by weight of a binder such as waterglass, phosphates, phosphoric acid, hydraulic binders, ceramic binders which are added individually. 2. The unburned shaped or unformed refractory material of item 1 is characterized in that the refractory is granulated expanded polystyrene, expanded perlite, burnt diatomite, crude diatomite, which are added individually or in a light blend. 3. The unburned shaped or unformed refractory material of item 1 is characterized in that the material further comprises an additive of 3 to 40% by weight of finely divided silica, quartzite, silica waste from chemical or metallurgical processes, individually or in a mixture.