DE1671272A1 - Process for the production of shaped bodies from lime using hydrocarbon-containing, aqueous / alcoholic emulsions or solutions - Google Patents

Description

A process for the production of moldings from Kali using hydrocarbonaceous, wäserigen / alkohol.Emulsionen or solutions. The object of the present invention is to produce moldings suitable for the lining of still temperature furnaces from limestone. Lumpy limestone is almost completely freed initially at temperatures required for Deoarbonisierung of carbonic acid, which preference at temperatures above 10009C, at 12000c can be performed to 14000C. The de-carbonised product is then cooled to temperatures below 25,000 to 30,000 and broken as hot as possible, eg at 15,000.

It is - according to the invention - no need to break fineness, since the operations described below provide further grain crushing on chemical schem ways that provide the space required for the favorable grain structure Peingutanteil.

One breaks only to grain fineness practically not below 0.5 mm, preferably between 0,? up to 8 mm grain size. The crushing process can also be avoided if one starts with limestone with a smaller grain size , for example limestone with a grain size of 0.5 to 8 mm. If one chooses grits of for example 0.5 to 3 to, so thereby the decarburization and / or time can be advantageously reduced.

So in this case, a first combustion temperature of 1050 to 1200 ° C may be sufficient or - at gent Agend fine material - for example, precipitated 0a003 of stockpiles of obsolete sodium hydroxide production - c are also less than 1000 °.

The fired and possibly comminuted material - about 0.5 to 8 mm grain size - will now be evenly mixed with hydrocarbon-containing aqueous or alcoholic emulsions or solutions, for example, tar keoh emulsion Bitumenemuleion, molasses, sulfite waste liquors eto possible. This can be done by spraying the expanded quicklime. Meanwhile , the crushed quicklime is kept in motion , for example on a vibrating grate, in rotating drums. These substances can be added cold. Subsequent Vaeuumbehandlung has proven beneficial. The addition of Emuleionent, which is known to contain, for example, 20-2596 water, causes the surface of the lime to be partially hydrated to form hydrated lime. Some of the coarse quicklime particles break down by themselves into finer material, which saves breaking energy and achieves the desired grain structure. One can also advantageously start from a mixed fire, ie a mixture of hard and soft burnt lime , the water of the emulsions used initially reacting with the soft burnt material. You can work so deliberately, almost DAFL only one particle fraction to the reaction dhZerkleinerung comes.

The amount of the carrier # nkungsmittels and / or its water content is such DAB is transferred only a part of the 0A0 BranntkaUes in hydrate, for example, 15 - 30y6. For example, high-percentage quicklime (9696 0a0) is hydrated using molasses with 69% sugar and non-sugar content, 89E other components and 239E wasner by mixing 80 kg quicklime with 20 kg molasses . In this case, 18.896 of the existing Caloiumoayda are converted into hydrated lime by hydration and crushed to practically finer than 10,000 x / em2. As a result, the required fine fraction of the grain build-up is formed by itself without the need for a Breohing process. The mass obtained in this way is pressed into molds without further processing and the moldings are fired to constant volume at temperatures above 10,000 ° C., preferably between 14,000 and 180,000.

With the 3inführung of 20 kg molasses as much carbon is introduced, which for dry decomposition given suitable? Guidance of the process, 100 kg of lime Branntbe up to 6 to 7 kg of carbon form. This purchase can participate aan - if desired - increase by adding marries fine carbon, such as coke, Peohkokr, carbon black, graphite * to *.

Claims (1)

A negative. 1. A process for the preparation of highly refractory molded bricks, in particular for the delivery of Iioehtemperaturöfen characterized in that limestone at temperatures of preferably 12000 m 1400 ° C $ is fired and lime, the material then partially cooled, and, if necessary, to a particle size not lower than 0, 8 mm, preferably from 0.5 to 8 mm broken, the space provided for the grain structure share en fines by chemical decomposition $ .B. Hydration of the lime is produced by means of a set wax content in the impregnation or binding agent , the material obtained is then pressed into molds and the shaped bodies are fired at temperatures above 100,000, preferably between 14,000 to 1800o0, to constant volume. 2. The method according to claim 1, characterized in that the impregnation with hydrocarbon-containing emulsions / binders takes place with a water content which corresponds to the intended amount of material or is adjusted to it. 3, method according to claim 1 bin 2, characterized in that the binder / Emuleionzueätze not more than 309:. -Based on the weight of the quicklime , preferably 15-2096 4. The method according to claim 1 to 3, characterized in that the impregnation below Movement of the solid is made . 5. The method according to claim 1 to 4, characterized in that the solid material after the decarbonization and / or the means used for drinking I`einatgut of another type sB coke is beigenisoht, 6. The method according to claim 1 to 5, characterized in that the impregnation / Impregnation is carried out during single or multiple evacuation.