Binder for production of metallurgical and coal briquettes

FIELD: metallurgy.

SUBSTANCE: proposed binder comprises organic polymer composed by polymer sodium- and polyalkylene oxide derivative of polymethylene-naphthalensulfonic acids and additive glycosides. Ratio of said components is as follows (in wt %): polymer sodium- and polyalkylene oxide derivative of polymethylene-naphthalensulfonic acids - 30-80 and additive glycosides - 20-70. Quantity of links in polyalkylene oxide chain is n=5÷25. Note here that polymer sodium- and polyalkylene oxide derivative of polymethylene-naphthalensulfonic acids is produced by condensation of sulfonic acid of naphthalene with formaldehyde while additives of glycoside derivatives represent fructosides, glucosides, galactosides or the mix thereof.

EFFECT: high-temperature durability and mechanical strength.

4 cl, 2 tbl

 

The invention relates to a process of preparation and production of briquettes, fluxes, pellets, as well as in technology agglomeration and granulation to produce all kinds of metallurgical and coal briquettes iron ore pelletizing, briquetting vysokovalentnyh slag and slag in steelmaking, metal shavings, refractory and ceramic products from various mineral raw materials.

Briquetting is the process of processing of raw materials (mainly mineral) into pieces of uniform composition and geometrical forms, the so-called briquettes. When briquetting involved in the processing of fine and dust-like waste various stages of production (dust, slag, metal chips and the like). Briquetting is the most simple and cost effective way of processing and recycling of waste coal, metallurgy, woodworking, refractory industries, this creates additional resources whose use is ineffective or impractical.

Depending on the properties of the feedstock briquetting is made without binders at high pressures (of the order of 100-250 kg/cm2and with a binder at a lower pressure. It is known [Mountain encyclopedia / edited by E.A. Kozlovsky. V.4. M: Owls. anti lopedia, 1989. - 595 S., ill.], as the binding can be applied binder such as lime, cement, water glass, etc. However, the use of such binders do not provide the required high mechanical strength, sufficient to ensure that the material is not destroyed during transportation and supply, as well as high temperature resistance briquette, at which he would begin to break down at the high temperature zone of the furnace. For briquetting requires a high dosage of binder (15%).

These drawbacks are substantially eliminated in the invention [RF Patent №2138566. Mixture to obtain a carbon-containing briquettes for the production of metals and alloys and method thereof] when applied as a binder for briquetting water-soluble derivative of a natural polymer lignin - lignosulfonate (LST), which is the closest analogue of the present invention. However, when applying the LST as a binder for the production of briquettes cannot provide high temperature resistance and mechanical strength at a low dose Supplement.

An object of the invention is to obtain a binder for the production of metallurgical and coal briquettes with high temperature resistance and mechanical strength when it is applied, the drop in small dosages.

The technical problem solved in the present invention is the fact that the binder for the production of metallurgical and coal briquettes contains organic polymer - polymer sodium and polyalkylbenzene derived polyethyleneteraftalat and additive derivatives glycosides in the following ratio of these components (wt.%): polymer sodium - and polyalkylbenzene derived polyethyleneteraftalat - 30-80%; derivatives glycosides - 20-70%. The number of links in polyalkyleneglycol of the chain is n=5÷25.

Polymer sodium - and polyalkylbenzene derived polyethyleneteraftalat obtained by the condensation of naphthalene sulfonic acids with formaldehyde, and as an additive derived glycosides use fructoside, glucosides, galactoside or a mixture of any such compounds.

The application of the proposed binder for the production of metallurgical and coal briquettes allows you to modify the rheological properties of structured coarse systems, which include raw materials for briquetting, chemically interacts with them, serves as a center of crystallization.

The combined use of organic polymer composed of several types of elementary links: sulfopropyl to ensure high adsorption is aktivnosti and reduce dependence on free alkali and side chains polyalkyleneglycol or another type to ensure the steric effect and/or add additional properties, allowing atomic-molecular level to control the properties of a solid surface, as well as derivatives of glucosides containing aldehyde group and a carbonyl group, distinguished by the presence in their structures free glycosidic hydroxyl, allows the selective adsorption to obtain organo-mineral complexes with the displacement of water molecules from the surface of the substance. Due to the steric effect of the proposed junction structures the frame, which has a stabilizing effect on the system as a whole.

Thus the use of the binder for the production of metallurgical and coal briquettes allows you to provide a synergistic effect, resulting to achieve high thermal stability and mechanical strength required a significantly lower dosage of the additive. So, to prototype a range of dosages from 10% to 15% for technical weight by weight of the charge, and for the proposed binder - 1-8% by weight of the mixture.

The ratio of the components in the proposed binder for briquetting chosen experimentally and is the best.

The content in the binder composition of the organic polymer is less than 30% does not provide a binding material particles (adhesion), and more than 80% does not set the required mechanical strength of the briquettes. When the content about svodnik glycosides less than 20% not provided the required density briquetting, but the content more than 70% leads to a significant decrease in thermal stability.

The optimal number of elementary units (n) in the chain sodium - and polyalkyleneglycol derived polyethyleneteraftalat General formula C10H6SO3Na(-CH2-C10H5SO3Na)n is n=5÷25. When n is less than 5 binder has a weak surface-active properties, the product is distributed throughout the volume, and when n is more than 25 increases the wettability trudnosmyvaemye materials.

More technical nature of the invention and achieved effects can be illustrated by the following examples.

Developed examples of the binder for the production of briquettes, for which data are given in table 1. As a prototype binder for briquetting used lsls production of JSC "Kondopoga". The mixture was a heterogeneous mass with large inclusions with moisture content of 17-18%.

Experiment by entering binder produced as follows:

in a portion of the charge for briquetting added control sample lsls in the amount of 10%, and the remaining samples were injected in the amount of 6% by weight of the mixture. Enter reagents were performed in two stages. First added 75% by weight of a binder, were mixed. Then made drying the mixture to a moisture content of 3-4% when the temperature is f 250°C and added the remaining 25%. When you enter the last portion of the reagent have difficulty with mixing, as in a dry mixture is quite difficult to enter the reagent. Final pulp was formed into briquettes to undergo further tests on compressive strength, thermal stability. Of these masses were molded specimen diameter and height of 50 mm weight 150 g of the compression pressure of 200 kg/cm2.

The results of the tests are presented in table 1.

Table 1
NThe binder composition, wt.%Dosage, %Compressive strength, MPaMechanical strength after temperature, MPaDensity, kg/m3
Organic polymerDerivatives glycosides120°C300°C600°C
160406127,54,51,26
230706115,83,03,01,23
38020696,53,02,51,25
42080673,521,51,22
5901066,83,521,51,24
6∗100-106,53,21,51,51,25
∗ - prototype
No. 4, 5 - transcendent values

Analysis of the results of the tests showed the following.

The use of a binder for the production of briquettes according to the invention compared with a binder-a prototype for the introduction of it in smaller amounts constituting 6% (examples 1, 2, 3) can significantly increase the strength of the briquette compression and to increase the mechanical strength of the briquettes after exposure to temperature. Thus, the use of the binder according to the invention in a dosage of 6% compared with the use of the prototype in the dosage 10% (examples 1 and 6) allows to increase the strength of the briquette compression is almost 2 times. The use of the binder according to the invention allows to achieve a higher mechanical strength after exposure to temperatures. So, for the case of application of the binder according to the invention (example 1) mechanical strength after temperature 120°C 2.3 times higher than that of the prototype (example 6), and in the temperature range 300-600°C in 3 times. It is important to note that this increase is not due to the dosage of the binder, which remains constant (examples 1, 2, 3, 6), namely due to the synergistic effect of its use.

Examples 4 and 5, are shown in table 1, show the impossibility of obtaining an effective binder for the production of meth is llurgicheskij and coal briquettes beyond the boundary values of the content components. So, at the same dosage, equal to 6%, the use of a binder containing less than 30% of the organic polymer and more than 70% derivatives glycosides (example 4), leads to lower thermal stability compared to the use of the additive according to the invention (example 2). When the content in the binder composition more than 80% of the organic polymer (example 5), the decrease of the mechanical strength as compared with the use of the binder according to the invention (example 3). Thus, when going beyond the optimal ratio is not observed synergistic effect, although the compressive strength and mechanical strength after temperature still higher than that of the prototype.

The effectiveness of the binder for briquetting has been evaluated also on the basis of the charge for briquetting consisting of copper concentrates.

When testing a batch of material is a mixture of copper concentrates produced by different manufacturers and industrial dusts with different copper smelting industries. Since one of the main destructive factors in the process of briquetting in the mining industry is the destruction at Peresypkin pelletized product (cake) during its transportation, the tests were conducted according to the method of determining the strength dropping adopted at JSC "UMMC".

As a researcher is as prototype binder for briquetting used 8-10 wt.% solution lsls density of 1.25 g/cm 3.. As a binder according to the invention is a superplasticizer and a glycoside in the ratio (wt.% 60:40). The test results presented in table 2.

Table 2
The charge for briquetting No. 1 (concentrate, Based, Service, guy, Sibay, gas, dust)The charge for briquetting No. 2 (concentrate Gaisky GOK, Navlakha, Sibay, Siberia-Base, copper slag)
The placeholderAccording to the inventionThe placeholderAccording to the invention
8%10%6%8%8%10%6%8%
Strength dropping, time71427>30714>15>15
Compressive strength, MPa15-202614183538

The presented results show that the use of the additive according to the invention significantly increases the strength of the briquette. When this tensile dropping when using the binder according to the invention is increased compared with the use of prototype - bundles on the charge for briquetting No. 1 more than 3 times, and when the briquetting mixture No. 2 more than 2 times with the same dosage of binder (8%), while the optimal binder dosage increases less significantly. The compressive strength increases by 2 times when the dosage of binder according to the invention is 10% and 8% on charge for briquetting No. 2 in relation to the strength of binding of the prototype. The examples do not exhaust all possible options binders for the production of metallurgical and coal briquettes, but help better demonstrate its properties.

1. Binder for the production of metallurgical and coal briquettes containing organic polymer, characterized in that it additionally contains an additive derivatives glycosides, and as the organic polymer in karnoe sodium - and polyalkylbenzene derived polyethyleneteraftalat in the following ratio, wt.%:

polymer sodium - and polyalkylbenzene derived polyethyleneteraftalat30-80%
derivatives glycosides20-70%

2. A binder according to claim 1, characterized in that the number of links in polyalkyleneglycol of the chain is n=5÷25.

3. Connecting to claim 1, characterized in that the polymeric sodium - and polyalkylbenzene derived polyethyleneteraftalat obtained by the condensation of naphthalene sulfonic acids with formaldehyde.

4. A binder according to claim 1, characterized in that the additive derivatives glycosides use fructoside, glucosides, galactoside or a mixture of any of these compounds.



 

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