SU1130617A1 - Binder for pelletizing iron ore materials - Google Patents

Abstract

CONNECTING FOR DIPPING IRONS OF MATERIALS, containing sulphite-yeast mash and ammonium salt, as it is. The fact that, in order to improve the water resistance of the agglomerated material, it additionally contains acrylic acid, and as ammonium salt - ammonium persulfate with the following ratio of components, wt.%: Acrylic acid 3-20 Ammonium persulfate 1-7 Yeast sulphite Yeast milk

Description

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The invention relates to ferrous metallurgy and can be used for the agglomeration of iron ore materials.

It is known to contain, containing sulphite-yeast. Mill 50-90 wt.% And phosphoric acid 10-50 wt.%. Curing is carried out at a temperature of 100-250 ° C. L.

The disadvantage of the binder is its low resistance to heat treatment below 100 C. In addition, it introduces phosphorus, which is a harmful impurity for ferrous metallurgy.

The closest in technical essence and the achieved result to the proposed is a binder containing sulphite-yeast wort 70-98 wt.% And ammonium sulphate 2 May 30% 2. .

A disadvantage of the known connection is the low water resistance of the agglomerated material, due to the fact that ammonium sulfate, when reacting with bleached sulphite yeast brew, rarely gives a cross-linked structure, and when reacting ammonium sulfate with a yeast yeast brew in the bulk of iron ore material, this structure becomes even less cross-linked or with a yeast yeast brew in the bulk of iron ore material, this structure becomes even less cross-linked or with a yeast yeast brew in the mass of iron ore material, this structure becomes even less cross-linked or with a yeast yeast brew in the mass of iron ore material. generally violated, leading to a significant reduction in the water resistance of the binder and agglomerated material.

The purpose of the invention is to improve the water resistance agglomerated material ..

This goal is achieved by the fact that a binder for the agglomeration of iron ore materials containing a sulfite-yeast mash and an ammonium salt is additionally introduced with acrylic acid, and as the ammonium salt, ammonium persulfate in the following ratio of components, wt.%:

Ammonium persulfate 1-7

Acrylic acid 3-20

Sulfite Yeast

mashEer

With a short (up to 10 min) heat treatment (at 60-90 0 of this binder in it, under the action of the radicals formed from ammonium persulfate in an aqueous medium, acrylic acid is copolymerized with a sulfite-yeast brazd to form a cross-linked water-insoluble structure, which improves water resistance as a binder, and obtained using his okuskovannogo materialoiala.

 The binder was tested by briquetting a mixture containing Kachkanar iron ore concentrate and limestone in a ratio ensuring the basicity of CaO: SiO- 1.25.

The compositions of the proposed and known binder are presented in Table 1.

The test results of briquettes for water resistance under laboratory conditions are presented in Table. 2

The water resistance of briquettes is calculated as the average of ten parallel experiments.

Example 1. The proposed binder of the first composition (Table 1) is tested in laboratory conditions when briquetting on a press with a force of 200 kg / cm. Briquettes are made with a diameter of 10 mm and a height of 12 mm. The binder is made from sulphite-yeast brew with a density of 1.24 g / cm (OST 81-79-74) acrylic acid (p - 1.3 g / cm) and powdered ammonium persulfate, taken in the table below. 1 ratio Binder consumption (by solid) composition. 25 kg per ton of briquettes. The dry mixture is moistened with an aqueous binder solution with a density of 1.10 1, 15 g / cm to the optimum humidity Q7

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The resulting briquettes are kept at 90 Sv for 10 minutes, after which they are tested for water resistance at a special installation. The briquette is placed in a thermostated chamber filled with water heated to 60 ° C, Harpy3jcy 125 g is fed to the briquette and the time of the beginning of the briquette destruction (shrinkage) is noted.

The water resistance of the obtained briquettes is 35.2 s, which is 5.6 s higher than that of briquettes prepared from a known binder (Table 2). Example 2. Test wire according to the conditions of example 1, but on the binder of the second composition (Table 1). The resistance of briquettes is 44.7 s, which is 15.1 s higher than that of the known ones (Table 2).

Example 3. Testing the wire according to the conditions of example 1, but on the binder of the third composition (Table 1). The resistance of briquettes is 42.6 s, i.e., 13.0 s higher than that of the known ones.

Example 4. Testing the wire according to the conditions of example 1, but the known number of the linker is shown in table. (In addition, ammonium sulphate, which is part of the binder, is introduced into the dry mixture, mixed with it, and then this mixture is moistened with a sulphite D1 burner solution with a density of 1.101, 15. g / cm to a moisture content of 9%. The resistance of briquettes is 29.6 s, which corresponds to the maximum value of resistance obtained on a known binder, while reducing the ammonium sulfate content to 20%, the resistance of briquettes is 19.8 s. Example 5. The test was carried out according to the conditions of Example 1, but on the binding agent of the fifth composition (Table 1). The worthiness of briquettes is 28.5 s, i.e., 1.1 s lower than that of the known ones, which indicates that it is impractical to reduce the acrylic acid content below 3.0%, and ammonium persulphate below 1.0%. Example 6. Testing the wire according to the conditions of Example 1, but on the binder of the sixth composition (Table 1). The water resistance of briquettes is 29.8 and corresponds to the water resistance of briquettes on a known binder, which indicates that it is inappropriate to bind the content of acrylic silicate to above 20.0%, and ammonium persulphate to above 7.0%.

Table 1 174 A binder that has the highest water resistance of known similar binders and does not lead to dilution of agglomerated material and does not introduce foreign (harmful) impurities into it, can be accepted as a basic object, since it completely burns out. The binder consists of a carbamide resin with a density of 1.0-1.3 g / cm, taken in an amount of up to 1% of the dry weight of the mixture, hardened in an acidic medium. A 5% hydrochloric acid solution is used as a hardener. The mixture in the amount of 5-15% of the consumption of carbamide resin. Analysis table. 2 shows that the proposed binder, in comparison with the known briquetting of iron materials, improves the water resistance of the briquettes produced by 15.1 s (from 29.6 to 44.7 s with the optimum ratio of components in the binder without increasing the binder consumption) compared to the base object by 5.6 s (from 39.1 to 44.7 s). The economic effect of using the proposed binder as compared to the known one in obtaining briquettes for the ferroalloy industry by increasing the durability of the finished briquettes when stored in open warehouses is 10 thousand rubles. per year compared to the base objects.

96.0 80.0 73.0 97.6 70.0

3.0 14.0 20.0 2.5 22.0

1.0 6.0 7.0 0.5 0.8

70.0

30.0

9P, 0 10.0

PokAZa LJ-j-, g 23 Humidity,% BbAoctoftKocTbi ь: 35.2 44.7 42.6

39.1 p-5 b 28.5 29.8 29.6

Claims (1)

BINDER FOR TEXTURING IRON-MATERIAL MATERIALS, containing sulphite-yeast mash and ammonium salt, exc. the fact that, in order to increase the water resistance of the agglomerated material, it additionally contains acrylic acid, and ammonium persulfate as the ammonium salt in the following ratio of components, wt.%: Acrylic acid Ammonium persulfate Sulphite yeast mash Rest