LU83301A1 - MIXED COMPOSITION FOR THE PLUGGING OF BLASTING HOLES OF BLAST FURNACES, ELECTRIC OVENS AND OTHER MELTING DEVICES - Google Patents

Description

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Mixed composition for plugging tap holes in blast furnaces, electric ovens and other melting devices .____________

The present invention relates generally to mixed compositions for plugging tap holes of devices such as blast furnaces, electric ovens and other melting devices.

Many compositions currently exist in this type of material. We find in particular: 10 - So-called tar masses: made up of a mixture of + or - 70% clay sand, 10% coal or coke and 20% tar.

- Masses called resins consisting of: * Either a mixture of + or - 70% sand and 15 clay, 10% coal or ground coke and a binder composed of only 15 to 17% tar with 3 to 4% of a liquid resin added.

* Or a mixture of 70 to 85% of a mineral element, a refractory aggregate with high mechanical resistance, a material with a high carbon content and 15 to 30% of a hydro-carbon binder. This hydro-carbon binder consisting of a hydrocarbon derivative and a thermosetting resin.

All of these materials have the following disadvantages: - So-called tar masses: The relatively slow coking of the mass gives off harmful tar vapors. Tar incuits cause dangerous flames and melting projections.

30 - Masses called resins: less risk of flame projection and melting. However, the emission of noxious fumes and fumes remains at the taphole and the capping machine. In addition, these materials are of irregular qualities and compositions due to the products used in the composition of their various binders and their conservation over time is very limited.

The present invention makes it possible to develop a plugging mixture no longer having any disadvantage of use with regard to the efficiency of the plugging, the projections ... . . ....

ï ï * - 2 - flame and cast iron and harmful smoke and gas emissions.

It therefore presents all the guarantees sought until 5 then as well as regards safety, hygiene and conservation.

The composition of the plugging mass according to the present invention comprises: 1 ° 70 to 80% of basic mineral elements such as re-fractional clays and refractory aggregates with high mechanical and pyroscopic resistance.

2 ° 5 to 15% of a carbonaceous matter of vegetable origin from which the harmful volatile elements have been eliminated.

3 ° Binders up to 15 to 25% composed of a product of synthesis of the family of glycerols providing the consistency, the cohesion and the binding of the material and setting accelerators complementing the cohesion and binding effect glycerol, which binders are distributed as follows: - synthetic product of the glycerol family 14 to 20% 20 - setting accelerators there 5%

The setting accelerators may be, depending on the size of the butchering devices: * Or an organic binder from the starch family.

* Either a chemical binder such as alumina phosphate alone or combined with the organic binder above.

Presentation of the constituents A ° / THE MINERAL ELEMENTS MAY BE COMPOSED: 1 ° / Of a refractory clay of the kaolinite type having an alumina content between 35 and 45% of alumina and a melting point of 1 670 ° C.

2 ° / Various aggregates such as: - A silico-aluminous sand having an alumina content of between 6 to 9% and a vdsin melting point of 1,650 ° C.

- Or a calcined alumina silicate with an alumina content of 40/44% and a melting point of 1680 ° C.

- Or a magnesia, a dolomite, a bauxite, a coridon, a silicon carbide.

- Or a mixed composition involving one or the other of these aggregates according to its physical qualities.

i - 3 - B ° / CARBONACEOUS MATERIAL;

Preferably, a carbonaceous material of plant origin such as charcoal will be retained. This material which contains few impurities and few ashes is of a regular composition.

It was chosen to create a porosity inside the mass and minimize the effects of different tensions in the material during its use.

10 C ° / BINDERS:

The binding of the materials will be obtained by the combination of a synthetic product of the glycerol family added to a setting accelerator.

1 ° / SYNTHESIS PRODUCT OF THE GLYCERCTS FAMILY: 15 The innovative element of this patent is indeed glycerin. There are two types of glycerins that can both go into the composition of the mass.

- A natural glycerin obtained by hydrolysis of fats.

20 - A synthetic glycerin obtained from propylene itself originating from the steam cracking of light petroleum fractions (Naphtha).

It is however this second type of glycerin that we will retain.

25 This material is obtained by reaction between propylene and chlorine to give allyl chloride, which, by the action of hypochlorous acid, is transformed into dichlorohydrin and then into epichlorohydrin: the latter is then hydrolized by sodium hydroxide. glycerin. The following reactions are observed: CH2 = CH - CH3 + C12-f CH2 = CH - CH2 Cl + HCl CH2 = CH - CH2 + HOC1-> CH2 OH - CHCl - CH2 Cl CH2 OH - CHCl - CH2 Cl ca (OR ) 2X CH2 - CH - CH2 Cl

35 CH2 - CH - CH2 Cl + H20 naOll. CH2 OH - CHOH -CH2 OH

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Glycerin is a colorless, odorless, syrupy liquid with a mild flavor.

It is hygroscopic, miscible with water and alcohol, poorly soluble in ether, chlorinated solvents, I ...

% l - 4 - carbon suture and oils.

ITS MAIN CHARACTERISTICS ARE THE

NEXT: ____ 5 - Molecular weight ................... 92.09 - Specific weight at 20 ° C ............ g / cm3 1,261 - Melting point ..................... ° C 18 - Boiling point under 1013 mbar ... ° C 290 - Vapor pressure at 20 ° .............. mbar 0.00021 10 to 100 ° C ........... mbar 0.30 to 20 ° C ....... .... mbar 57 - Specific heat at 20 ° C ........... kj / kg ° C 2.408 - Heat of vaporization at 55 ° C ...... kj / kg 955.5 - Heat of vaporization at 195 ° C ..... kj / kg 824.7 15 - Flash point ...................... ° C 160 - Viscosity at 20 ° C .................... cP 1 412 - Viscosity at 50 ° C ............... ..... 142 - Refractive index ................ n 2j0 1.4740 By way of example, mention may be made of synthetic glycerin from SOLVAY, from SHELL or from DOW.

2 ° / SETTING ACCELERATOR: The setting accelerator will be: * Either an organic binder from the starch family, 25 * Or this organic binder whose action will be supplemented by a thermosetting agent such as alumina phosphate or phosphoric acid or soda or potash silicate for installations with high back pressure and high capacity.

The organic binder was chosen from the family of starches according to its high agglomerating power and its good viscosity.

In order to obtain a material with more or less rapid hardening, it will be advisable to dose the setting accelerator judiciously.

We can define, by way of example: - A mass with normal hardening:

In this case, the binder will be composed of: - 90% of the synthetic product of the family of 40 glycerols, 4

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- 5 - - 10% setting accelerator.

“A fast-curing mass:

In this case, the binder will be composed of: 5 - 80% of the synthesis product of the glycerol family, - 20% of setting accelerator.

This new bouchaye mass therefore has the following advantages in particular: * 10 1. - Constant plasticity whatever the atmospheric conditions which greatly facilitates storage and conservation.

This same plasticity removes all preparations before use (reheating for example) and avoids any problem at the time of injection.

2. - The material remains stable up to a temperature of 150 ° C, which prevents hardening inside the capper cylinder which can disturb the proper functioning of the device.

20 3. - The presence of a setting accelerator, reacting from 150 °, makes it possible to obtain an effective sealing of the taphole after a very short time, thus freeing the capper.

4. - The absence of tar, resins and 25 hydrocarbon products in this new mass avoids the formation of gas pockets causing flames or projections of cast iron.

5. The combination of the glycerol binder and the setting accelerator provides the material with sufficient mechanical strength to withstand the erosion of the pig iron and the slag.

6. - The nature of the binders used makes the release of vapors, gases or fumes practically zero.

7. - The minute evolution of vapors, gases or fumes observed is non-toxic and does not present any danger to the user.

Some examples of sealing masses belonging to the compositions according to the invention are indicated below.

4 0 Example 1; - 6 - 10% Clay 65% silica sand 5% vegetable carbon 5 17% glycerin 3% setting accelerator. Example 2: 10% Clay 60% silica sand 10 5% zirkon 5% vegetable carbon 17% glycerin 3% setting accelerator. Example 3: 15 10% Clay 62% silica sand 5% corundum 5% vegetable carbon] 14% glycerin 20 4% setting accelerator.

Example 4: _ 10% Clay 60% silica sand 5% vegetable carbon 25 5% chromite (or bauxite) 16% glycerin 4% setting accelerator. Example 5: 10% Clay 30 70% chamotte 5% vegetable carbon 12% glycerin 3% setting accelerator. Example 6; 35 10% Clay 70% andalusite 5% vegetable carbon 12% glycerin 3% setting accelerator. 40 Example 7: - 7 - Ί * 10% Clay 60% bauxite 10% corundum 5 5% carbon vëyétaj 12% glycerin 3% setting accelerator.

A number of examples have been given to illustrate the composition of sealing masses according to the invention, it is however understood that these are not limiting.

Depending on the various demands, it will be possible to modulate the percentage of binders and to use other aggregates such as magnesia, silicon carbide, etc.

Claims (10)

1. Mixed composition for plugging tap holes in blast furnaces, electric ovens and other melting devices, characterized in that it is essentially formed from 70 to 80% of basic mineral elements such as refractory clay, refractory aggregates with high mechanical and pyroscopic resistance, carbonaceous materials of plant origin, binders of the glycerol family and 10 setting accelerators completing the binding effect of the binder. 2. Composition according to claim 1 characterized by an analytical stability taking into account the regularity of its components. 3. Composition according to any one of claims 1 to 2 characterized by a constant plasticity whatever the atmospheric conditions greatly facilitating storage and conservation which will be very long (several months). 4. Composition according to any one of claims 1 to 3, characterized by the simple fact of its plasticity by eliminating the operations prior to use such as reheating, mixing, etc. 5. Composition according to any one of the claims 25 to 1, characterized by a stability of the material up to 150 ° C. avoiding any risk of hardening in the capping device which could disturb its proper functioning and consequently removal of all waste. 6. Composition according to any one of claims 1 to 5, characterized by the presence of a setting accelerator reacting from 150 ° C enabling the taphole to be effectively closed in a very short time, thus releasing the capping device. 7. Composition according to any one of the claims 35 to 1, characterized by the absence of hydrocarbon products capable of causing gas pockets with risk of flame or of cast iron projection. 8. Composition according to any one of claims 1 to 7 characterized by the combination of the glycerol binder 40 and a setting accelerator making it possible to obtain '4 f - S i' - 9 - a material with good mechanical resistance. 9. Composition according to any one of claims 1 to 8, characterized by a reduction, even a suppression of the release of vapors, gases or fumes consecutive to the nature of the binders used. 10. Composition according to any one of claims 1 to 9, characterized by a reduction, or even elimination, of the dangers of toxicity for the user.