SU1475948A1 - Charge for producing manganese-containing briquettes - Google Patents

Abstract

This invention relates to the field of metallurgy and can be used in the manufacture of manganese alloys. The aim of the invention is to increase the degree of extraction of manganese by increasing the strength of briquettes and reducing the cost of manganese alloys. The mixture for the preparation of manganese-containing briquettes contains, wt%: manganese-containing dust from electrostatic precipitators of ferroalloy furnaces 35-75

dump manganese metal slag 5-40

water 20-25. The use of the charge makes it possible to increase the strength of briquettes by 10-30%, to increase the degree of extraction of manganese in the alloy by 11-14% and to reduce the cost of briquettes by 60-70%. 1 tab.

Description

one

The invention relates to metallurgy and can be used in the manufacture of manganese alloys.

The purpose of the invention is to increase the degree of extraction of manganese, reduce the cost of briquettes and increase their strength.

The proposed mixture for the preparation of manganese-containing briquettes contains a mixture of electrostatic dust filters from ferroalloy furnaces of waste manganese metal slag, and as a binder for water in the following ratio, wt.%:

Manganese-containing

electrostatic dust

ferroalloy furnaces 35 - 75

Dump slag of metallic manganese 5-40 Voda20 - 25

Manganese dust from electrostatic precipitators of ferroalloy furnaces contains, wt%: Mp 20.0-30.0; RiO-z 5.0- 33.0; CaO 5.0–20.0; MgO 2.5-3.5; - A1aO, 1.5-4.0; FeO 0.5-2.0; S 0.5-5.0; C 1.5-9.0; Р 0.02-0.2; ppt 2.5-12.0.

Dump slag metal manganese contains, wt.%: Mn And, 3-14,2; SiOn 28.3-28.6; CaO 44.8-46.0: MgO 3.3-3.5; A1A03 3.3-3.6; FeO 0.1-0.3; S 0.3-0.34; C 0.2-0.3; Р 0.03-0.005.

Water is used as a binder.

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The strength of briquettes produced from the proposed charge increases due to the fact that the composition of these components includes a large amount of CaO and MgO, which are necessary for the cementation of briquettes.

The increase in the strength of briquettes is also due to the dispersion of dust from the cleaning electrostatic precipitators, which contains a fraction of more than 20 microns in an amount of 92%. In addition, the cost of briquettes is increased by increasing

ratios

CaOMgO

slo7

in the charge, as a result, the temperature of melting of the briquettes increases, which, under the conditions of ore-thermal smelting, raises the temperature of the process as a whole. The reduction in the cost of manganese alloys is ensured by the fact that cheap raw materials, such as dump manganese metal slag, are introduced into the composition of U-20, and water is used as a binder. In addition, the reduction in the cost of manganese alloys is due to the relatively high strength of the briquettes, which, when used for smelting manganese alloys, practically do not contain pulverion, which means that 30 losses of raw materials are reduced. If waste metal manganese slag is introduced into the charge in an amount greater than 40%, then the strength of the briquettes obtained decreases due to the lack of a binder.

When the content of waste slag in the composition of the mixture is less than 5%, the strength of briquettes decreases due to the lack of CaO, which plays a major role in the grouting of briquettes,

This is due to the fact that with the content of waste slag over 40% in the charge, the number of chemically strong highly basic compounds increases.

40

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5 0 5 0

five

0

an effect that provides the necessary strength of briquettes, while simultaneously reducing the cost of the charge, since water is the cheapest and most affordable binder,

With the introduction of water in the mixture in the amount of 20-25 wt.% The main cementitious components of the mixture of CaO and MgO acquire the necessary reactivity, providing high mechanical strength of the briquettes.

With a lack of binder (water), the strength of the briquettes decreases, since the reactivity of the cementing components is not ensured. Due to the decrease in the strength of briquettes, the dusting up increases upon heating them to the melting temperature, and consequently, the degree of manganese recovery decreases and the cost price of manganese alloys increases.

The introduction of more than 25% by weight of water into the mixture increases the flowability of the resulting mass, which makes it unsuitable for briquetting. When dried, such a mass cracks, which leads to an increase in the amount of waste, an increase in dust removal and a decrease in the degree of manganese recovery. In addition, the introduction of more water unnecessarily reduces the percentage of use of margarine dust.

The briquettes obtained from the proposed mixture do not crack when heated to and above, therefore when using them for smelting manganese alloys, the dusting is practically absent, i.e. the degree of extraction of manganese increases, the loss of raw materials decreases, and consequently, the cost of manganese alloys decreases.

Also derived from this

The type of 2CaO SiO2, non-interaction mixture of manganese alloys used for alloying steel, has a low phosphorus content due to the fact that the mixture of dust cleaning electrostatic precipitators and waste slag is metallic with water. In addition, the fractional composition of briquettes is changed due to the use of waste slag of coarse-grained metallic manganese containing a fraction of 105 µm of goganganese containing phosphorus by an order of magnitude less than the dust used

in a known technical solution. Example. For

in the amount of 90%. The introduction of the binder, in which water is used, increases the fluidity of the charge by more than 25%, and therefore reduces the strength of the briquettes, which leads to an increase in dust loss,

Used as a binder, water within the proposed limits allows to obtain a cementing effect 55

and me. To carry out comparative tests of experimental briquettes, 3 mixtures were prepared containing the components within the proposed limits and 2 mixtures containing the components in ratios outside the proposed limits. The end products for steel alloying have a low phosphorus content due to the fact that the mixture of dust from cleaning electro-precipitators and waste manganese metal slag contains phosphorus in pores in the known technical solution. Example. For

five

and me. To carry out comparative tests of experimental briquettes, 3 mixtures were prepared containing the components within the proposed limits and 2 mixtures containing the components in ratios outside the proposed limits. The starting materials were mixed in a given ratio and briquetted on a P-50 press with a force of up to 200 kg / cm2.

The emitted briquettes were dried in a muffle furnace at a temperature of 130-140 ° C for 1.5-2.0 hours. The finished briquettes were tested for mechanical strength and used for smelting manganese silico. For this, pilot batches of briquettes were loaded into a Tamman metal furnace and the degree of manganese extraction was determined in the resulting manganese alloy.

In order to obtain comparative data 15 for melting these briquettes.

20

25

thirty

in parallel, a batch of briquettes is made from a mixture of known composition. The briquettes of this batch were also subjected to strength tests and, after obtaining manganese alloy from them, the degree of manganese recovery was determined, which was 74%. The results of the tests are shown in the table.

As can be seen from the table, the composition of the mixture, which was used in the preparation of the third batch of briquettes having the highest mechanical strength - 131 kg / cm2 and the highest degree of manganese extraction, i.e., has the best properties. its transition to metal is 85.2% at a melting point of 1365 ° C, sufficient for conducting the melting process. Somewhat lower, but quite satisfactory, indicators are the briquettes of the invention and the fourth installment. Indicators of briquettes of I and V batches and briquettes made from a known charge are significantly lower than those of briquettes made from the proposed charge.

The basicity and the melting point vary in proportion to the increase in the amount of waste slag of manganese metal.

The highest values of these indicators have the charge from which the first batch of briquettes are made. However, at the same time, the mechanical strength of briquettes prepared from this charge decreases dramatically, which leads to an increase in the dust content and, consequently, to a decrease in the extraction of manganese,

When heating the briquettes of the pilot batches up to 1050 ° C and higher, the briquettes prepared from the mixture of the proposed composition did not practically change their appearance, while the briquettes

The table shows that the cost of briquettes from the proposed charge is much lower than the briquettes from the known charge, and therefore, the cost of manganese alloys is lower,

The use of this mixture for the production of manganese-containing briquettes provides in comparison with the known mixture the following advantages: an increase in the strength of briquettes by 10-30%; an increase in the degree of extraction of manganese by 10.8-13.5%; reducing the cost of briquettes and manganese alloys; reduction of raw material losses due to reduction of dust extraction in the process of smelting manganese alloys; improving the environmental conditions of the smelting process.

The mixture for preparing manganese-containing briquettes, containing manganese-containing dust from ferroalloy furnaces, is an additional manganese-containing component intended to increase

and binder, about t - so that, with the degree of extraction

45

50

55

manganese by increasing the strength of briquettes and reducing the cost of manganese alloys, it contains as an additional manganese-containing component dump metal slag manganese, and as a binder - water in the following ratio of components, May,%: Manganese dust from electrofilters of ferroalloy furnaces Dump metal slag Margania Water

35 - 75

5-40 20 - 25

The chum salads prepared from the known charge cracked and crumbled to form dust that was carried away with the exhaust gases.

When heating the I and V batches of briquettes, despite the fact that their strength was somewhat lower than that of briquettes made of a known charge, the dust content was significantly less due to the fact that they contained more CaO and MgO than briquettes made of a known charge. higher and manganese recovery rates

The table shows that the cost of briquettes from the proposed charge is much lower than the briquettes from the known charge, and therefore, the cost of manganese alloys is lower,

invention formula

The use of this mixture for the production of manganese-containing briquettes provides in comparison with the known mixture the following advantages: an increase in the strength of briquettes by 10-30%; an increase in the degree of extraction of manganese by 10.8-13.5%; reducing the cost of briquettes and manganese alloys; reduction of raw material losses due to reduction of dust extraction in the process of smelting manganese alloys; improving the environmental conditions of the smelting process.

invention formula

The mixture for the preparation of manganese-containing briquettes containing manganese-containing dust from ferroalloy furnaces, an additional manganese-major component of the increase

and binder, about t - so that, with the degree of extraction

five

0

five

manganese by increasing the strength of briquettes and reducing the cost of manganese alloys, it contains as an additional manganese-containing component dump metal slag manganese, and as a binder - water in the following ratio of components, May,%: Manganese dust from electrofilters of ferroalloy furnaces Dump metal slag Margania Water

35 - 75

5-40 20 - 25

I

II

II

IV

V

20 35 48 75 83

50

40

thirty

five

2

301410

251380

221365

201320

151280

82 125 131 112

75

3.1 2.6

2.1 2.8 4.0

1.48

1.32

1.2

0.92

0.89

Claims (1)

Claim The mixture for the preparation of manganese-containing briquettes containing manganese-containing dust of ferroalloy furnaces, an additional manganese-containing component and a binder, is characterized by the fact that, in order to increase the degree of extraction of manganese by increasing the strength of briquettes and reducing the cost of manganese alloys, it contains as an additional manganese-containing component, the heap of metallic manganese, and as a binder, water in the following ratio of components, May.%: Manganese-containing dust of electrostatic precipitators of ferroalloy furnaces 35 - 75 Slag of metallic manganese 5-40 Water 20 - 25 The consignment The composition of the charge manganese Tempe From the outside Mechanism Dustproof Basis bree containing briquettes, wt.% ratrata reading cheskaya ablation nost comrade floating Mar other at bree singing Ghana nost melting tov,% Manganese Dump Water bree when bree bree holding slag me comrade shop comrade tov,% dust electronic tallich- "from alloy kg / cm ² rofilters whom mar from bri ferroalloy- ghana Kets ovens Z I 20 fifty thirty 1410 84.0 82 3,1 1.48 II 35 40 25 1380 84.5 125 2.6 1.32 III 48 thirty 22 1365 85,2 131 2.1 1,2 IV 75 5 20 1320 84.6 112 2,8 0.92 V 83 2 fifteen 1280 80.0 75 4.0 0.89