SU901320A1 - Charge for producing manganese agglomerated material - Google Patents

Description

Iaubregnis refers to metallurgy and can be used in the production of marrahueui ix ferroalloys. Ishkhta known for the production of manganese sinter, consisting of manganese-containing raw materials, return sinter and coke 1. The disadvantage of this mixture is low yield of agglomerate, which is due to the presence in the ore part of a large amount of 0-3 mm fraction, which improves the gas permeability of the mixture. proposed by the technical essence and the achieved result is the composition of shnchta containing marhantse concentrate, iron ore concentrate, return of agglomerate, sludge and coking with the following ratio of components s, wt.%: Manganese concentrate 56-71 Sludge 5-20 Iron ore concentrate 4 Return sinter 20 The amount of carbon in this mixture is 5.5%. and the moisture content is 8% 2. In addition to the low yield of the agglomerate and the high content of phosphorus in it, it is necessary to use expensive iron ore concentrate when preparing the agglomerate from this mixture. The known charge also does not allow the disposal of waste products, such as dust, which is formed in large quantities in ferroalloy plants. The purpose of the invention is to improve the quality of sinter and waste disposal. The goal is achieved by the fact that the charge for the production of manganese sinter, containing manganese concentrate, sludge, return of sinter n toxic, additionally contains manganese ferroalloy dust and manganese ore in the following ratio of components, wt.%: Shlama 0.2-3.5 Sgate 20- 35 Cokeck-9 Dust of manganese ferroalloys 0.2-2.5 390 Marg anthran ore 0.22-2.5 Manganese concentrate Rest Known manganese-containing raw materials for the production of sinter, and in particular concentrate of the 11th grade, characterized by Vyshen content (20-30%) fraktsnn 0-3 mm, which is subjected to bad pelletizing. However, it is known that the particle charge of 12 mm serve as centers of pellets. For good bleedability of the mixture, it is also necessary to have small fractions of the material (0.03-0.05 mm). They, layered on fractions of 1-2 mm, help to improve the clodiness of the charge. It is also possible to increase the chargeability of the mixture by using lime. Manganese ore dust and ferroalloy dust contains 65-75% of a fraction of 0.03-0.05 mm. In addition, the dust of ferroalloys, which forms during the casting of alloys, consists of a metal part (grains of alloy) and lime, which is cast by the casting machines of casting machines. It also has a positive effect on the preliminary pelletizing process. Thus, setting into a mixture containing a large amount of a fraction of 0–3 mm, thin materials (ferroalloy plate and martane ore ore), it is possible to improve its closeness. As a result, its gas permeability increases, which is accompanied by an increase in the sintering rate of the agglomerate. Lime from the mix promotes hardening of both raw and burnt pellets. Since the manganese-containing raw material has a high moisture content of 13-17%, and sludge is 30-40%, the charge that is subjected to agglomeration is too wet, which affects its gas permeability. Additive to such a mixture of dry dust helps to reduce its moisture content. In addition, ferroalloy and Manganese ore contain such useful components as manganese, iron, calcium oxide, magnesium oxide and carbon (Table 1), which are used in the process of smelting alloys, thereby reducing the consumption of limestone, iron ore or cast iron shavings. . The choice of the boundary values of the proposed components is due to the existing production technology of manganese sinter, as well as the detected relationship between the sintering rate of the charge and the amount of dust introduced. So, the amount of refund used. agglomerate ranges from 20 to 35%, and coke from 9%. An approximate calculation of the daily amount of dust collected by ferroalloys and manganese ore shows that their consumption during the agglomeration of raw materials can be 0.2-2.5% by weight of the main part of the mixture. A comparative analysis of the results of research on the indicators of agglomeration known (Table 2, options I and 2) and the proposed (Table 2, options 3-6) charges confirms the selected boundary values of the proposed components and the improvement of the indicators of the process of their agglomeration. Studies on the agglomeration of charge materials of various compositions were carried out in a laboratory bowl with a diameter of 80 mm and a height of 350 mm. Weighted. Charge materials are subjected to preliminary pelletizing in a drum for 2 minutes, and then they are loaded into the bowl and sintering them. The resulting agglomerate is tested for strength by dropping a 3.8 kg load onto it with a BbicoTbj of 1 m three times (such a test of strength agglomerate is used due to the absence of the Rubin drum and the low weight of the obtained cake). The yield of agglomerate is estimated by the amount of fraction + 10 mm. The data of chemical analysis of the initial charge materials are given in table. 1. In table. 2 shows the results of research on the agglomeration of the mixture of different composition. As follows from the table. 2, introduction to the mixture yelled with fsro-alloys (0.2–2.5%) and manganese ore (0.2–2,) contributes to an increase in the rate of sintering and an increase in the yield of suitable sinter by 2.3–6.7% (variants 3- 5) compared with the known composition (option 2). The optimal composition of the proposed mixture should be considered. %: manganese concentrate 59.95; sinter return 27.5; sludge 1.85; coxy 8; dust ferro plan 1.35; manganese dust 1.35; since it is precisely this ratio of components that ensures the highest yield of the ted agglomerate and the highest rate of its sintering. An increase in the charge of dust of ferroalloys and manganese ore dust by more than 2.5% is accompanied by a decrease in the rate of its sintering and the yield of suitable agglomerate, which is caused by an excessive amount of thin materials that influence gas permeability. If ferroalloys and manganese ore dust are used in a mixture of less than 0.2%, each will contain an insufficient amount of a fine (0.03-0.05 mm) fraction, which will not provide an improvement in the chargeability of the charge, and consequently, an increase in the yield of suitable agglomerate. The moisture content of the proposed mixture due to the use of dry dust is 14-15% (versus 16-18% when using materials 590132 of known ishkhta), the phosphorus content in the sinter of options 3-6 is 8-10% lower than in the sinter of options 1 and 2. The use of sinter obtained from the proposed composition of the charge in the smelting of, for example, perperomany ferromanganese, can be carried out without the addition of iron shavings, since manganese-containing waste contributed 3.5 4, 0% iron. Thus, the use of solid dust (ferrous alloys and manganese ore in the charge for the production of agglomerate) helps to improve its clodability. At the same time, the gas permeability of the materials increases, which leads to an increase in the rate of sintering and yield of suitable agglomerate. For example, 06 | the amount of sludge (gas products) inserts more than 100 thousand tons. During the month, 5-7 thousand tons of ferroalloy dust and 5-7 thousand tons of manganese ore are produced at the plant. They are practically not used when smelting alloys, but are emitted into a sludge storage, polluting the ambient atmosphere "occupies huge areas of land. It is possible to produce sinter on the proposed charge and use it in the production of ferroalloys in ferroalloy plants. This will ensure waste disposal, increase the yield of sinter: and manganese sludge production The expected ecoiomic effect from the introduction of the proposed blend composition for the production of manganese sinter is 958.9 thousand rubles. in year. Table 1

table 2

Materials

L-131XT: TG1-G TG

Agglomeration indicators Sintering rate of the charge, mm / min 58,259,1 59,8 63,4 63,259.2

The yield of agglomerate

(amount of fraction + 10 mm),% 53,455,858,1 62,5 61,355,6

Note: According to the option in the charge of carbon 5.5% (in excess of 100 ore parts).

In charge of option 3, the minimum number of input components is contained, according to option 4, the average value, according to option 5, maximum, and under option 6, it exceeds the maximum.

Claims (2)

Claim 7 Covenant 7-9 The mixture for the production of manganese sinter-ferroalloy 0.2-2.5 merata, containing manganese concentrate, manganese dust 0.2-2.5 , tssham, return of sinter and coking, 6 tons of l and -Manganese concentrate Else that, with the aim of Sources of Information, quality of sinter and recycling waste taken into account during the examination it additionally contains manganese dust 1. S. Khitrik et al. Electrometallurgists, precious ferroalloys and manganese ore dust of manganese ferroalloys. Kiev, Technique, with the following ratio of components, 1971, p. 27. weight.%: 2. Processing of iron and manganese Shlam0,2-3,5rud Transcaucasia. Collection. Tbilisi, MetsniereReturn of sinter 20-35 ° ba, 1979, p. 85-92. 9013208 Continued table. 2 The composition of ishkhta options,% Manganese dust