DD294702A5 - HIGH QUALITY MOERTEL WITH SILICONE TIE - Google Patents

Abstract

This invention relates to a higher value pebble with silica sol bond for the delivery of pyrotechnic plants with a form brick lining. According to the invention, a mortar consisting of fine-grained clay and / or kaolin and / or mullet clay and / or fine-grained industrial refractory products and / or fine-grained fused corundum and / or silicon carbide and / or zirconium silicate and / or tabular earth clay and refractory binder clay and / or -kaolin, in addition finely ground alumina with an a-Al2O3 content between 85 and 95% was added. This dry mixture is mixed before processing silica sol with about 30% amorphous SiO2 and optionally water until the necessary processing consistency. The silica sol forms after drying with the finely ground alumina a kind of zeolitic bond, whereby a high strength is achieved even when cold. When exposed to thermal stress, the amorphous SiO2 of the silica sol reacts with the clay to form mullite, giving the mortar excellent strength. On the one hand, the special clay is so active that mullite formation with amorphous SiO2 begins at 780C, but on the other hand it is so stable that the hardness of the peat under temperature stress is not reduced by shrinkage of the clay. silica; pyrotechnic plant; Formsteinausmauerung; alumina; a-Al2O3 content; amorphous SiO2; zeolitic bond; mullite; Strength; Tonerdeschwindung}

Description

Field of application of the invention

This invention relates to higher grade mortar with silica sol bond for the delivery of pyrotechnic !! Plants with a stone lining.

Characteristic of the known state of the art

Are known ceramic bonding mortar, the fine-grained clay and / or kaolin and / or Mullitschamotte and / or fine-grained processed industrial refractory accumulation product and / or fine-grained fused corundum and / or silicon carbide and / or zirconium silicate and a high proportion of refractory binding clay and / or kaolin existon. Depending on their composition, they form kenemic strengths from 1200 ° C operating temperatures. The disadvantage is that the strength in the lower temperature range is relatively low and that in the areas of the lining in which the sintering temperature is not reached, the mortar does not bind ceramic.

Thus, the mortar is the weak point of the lining and therefore very vulnerable to mechanical and chemical stress. Also known are ceramic-binding mortars, which was added to reduce the sintering temperature of water glass. Disadvantage of this mortar is that also hardly a solidification occurs in the cold state and that the refractoriness of the mortar is reduced, so that use temperatures above 1200 ⁰ C are barely mastered.

Object of the invention

The aim of the invention is to use mortars for the delivery of pyrotechnic systems with a Formsteinausmaueruny that meet the claims better than previously used. The mortars should have high fire resistance and good strength over the entire temperature range.

Explanation of the essence of the invention

The object of the invention is to change the composition of the mortar in order to achieve the objective. According to the invention a mortar, consisting of fine-grained clay and / or kaolin and / or Mullitschamotte and / or fine-grained industrial refractory seizure products and / or fine-grained fused corundum and / or silicon carbide and / or zirconium silicate and / or »; Tabulartonerde and refractory binding clay and / or -kaolin, additionally finely ground alumina with a Ct-Al ₂ O ₃ -GoIIaIt added between 85 and 95%. This dry mixture is mixed before processing silica sol with about 30% amorphous SiO ₂ and optionally water to achieve the desired processing consistency. The silica sol forms after drying with the finely ground alumina a kind of zeolitic bond, whereby a high strength is achieved even when cold. When the pyrotechnic system is heated, the amorphous SiC _{2 of} the silica sol reacts with the clay to form mullite, giving the mortar excellent strength. In addition, the amorphous SiO _{2 of} the silica sol penetrates deep into the refractory bricks during the wall, so that a stable bond between mortar and stone is created. The special clay is on the one hand still so active that is formed from 780 ⁰ C with the amorphous SiO ₂ mullite, but on the other hand so stable that the strength of the mortar is not reduced by temperature shrinkage by shrinkage of the clay. The mortar is very resistant to mechanical and chornic attack. With appropriate choice of the grit base and low binding ratio, a high fire resistance with good mechanical strength in the low temperature range can be achieved.

Embodiment 1 In a melting drum for the production of glazes kaolin chamotte bricks with a conventional ceramic

laid mortar based on corundum with about 30% refractory binding clay.

At the working temperature of 1200 ⁰ C the ceramic bond of the mortar does not set yet, the mortar joints are through

the glaze is washed out; individual stones are released from the dressing so that the melting drum must be taken out of service.

Embodiment 2

In a melting drum according to Embodiment 1, kaolin chamotte bricks are treated with a mortar made of 20% by weight of refractory binding clay

40% by weight fine-grained fused corundum

38mA .-% fine-grained Al ₂ O 3 treated-rich industrial attack product, and 2 wt .-% of finely ground alumina having an a-AI ₂ O ₃ content routed between 85 and 95%, wherein the dry premixed mortar prior to processing 5 Ma.- % Silica sol with 30% SiO ₂ and water is added until the desired processing consistency is achieved. After drying, a zeolitic bonding of the mortar occurs, when exposed to heat, a muliitic binding matrix is formed. The attack of the thin liquid melt can better resist the mortar, the service life of the melting drum is increased.

Embodiment 3

A operated at 1700 ° C aggregate with high abrar.iver load of the refractory material is delivered with Edelkorundsteinen, being used as a mortar mixture

75% by weight of fine-grained corundum

10Ma .-% refractory binding kaolin and 15Ma .-% finely ground clay as in Example 2

15Ma .-% silica sol with 30% SiO ₂ and water is added to obtain the desired consistency prior to processing. The mortar has very good strengths on the hot and cold side of the lining and is very resistant to abrasive wear.

Embodiment 4

A melter for mineral fiber wool is supplied with mullite-bound Siliziumcarhid stones, wherein as a mortar dry mixture of

55% by weight of fine-grained silicon carbide

10Ma .-% refractory binding clay

and 35% by weight of finely ground alumina having an a-Al ₂ O ₃ content of between 85 and 95%, which is mixed with 30% by weight of silica sol before processing. The mortar is very resistant to the chemical attack of the melt.

Claims (1)

High-grade mortar with silica sol bond, consisting of 50% by weight to 90% by weight of fine-grained clay and / or kaolin and / or mullet and / or fine-grained processed industrial refractory products and / or fine-grained fused corundum and / or silicon carbide and / or zirconium silicate and / or Tabulartonerde and 2Ma .-% to 30Ma .-% refractory binding clay and / or kaolin, characterized in that additionally 2 to 35% by weight of finely ground alumina having an a-Al 2 O ₃ content of between 85 and 95%, and the dry mixture prior to processing
5 to 30 mass% silica sol with an SiO ₂ content of 30%
is mixed in.