SU1067066A1 - Flux for preparing agglomerate - Google Patents

Abstract

A FLUUS FOR OBTAINING AN AGGLOMERATE, which includes limestone and an iron ore additive, characterized in that, in order to increase the strength of the agglmerate, reduce its cost, and increase vanadium through-extraction, the flux contains lime-vanadium waste as an ore-extractant, fume-extract, and ore extractant. vanadium slag in the following ratio, wt.%; Limestone-weshchivye waste oxidation extraction treatment of vanadium donkey 20-60 known for the rest; SP

Description

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The invention relates to ferrous metallurgy, in particular, to flux compositions for producing agglomerate.

It is known to use limestone fl as agglomeration flux.

However, this flux enhances the macro- and micro-inhomogeneity of achlospace, contributing to the formation of a low-strength, predominantly large-pore structure.

It is also known to obtain fluxed agglomerate using raw limestone and iron flux 2.

The disadvantages of this composition are the relatively low strength of the agglomerate obtained using this flux and the need to introduce into the technological cycle an additional operation for the preparation of iron flux, which increases the cost of sinter production

The closest in technical essence and the achieved result Ijt proposed is a flux for obtaining agglomerate, including limestone and iron-containing sludges collected in gas cleaning and sanitary facilities of metallurgical plants H.

However, the application of the known flux does not provide stable production of high-strength agglomerate and sufficient gas permeability of the sintered layer. In addition to TOi, in preparing for the agglomeration of a number of ishams, their preliminary dehydration is necessary, which increases the cost of sinter production.

The purpose of the invention is to increase the strength of the agglomerate, reduce its cost and increase the through extraction of vanadium.

This goal is achieved by the fact that the flux for the production of lomerate, including limestone and iron ore additive, contains lime iron vanadium waste from oxidation-extraction treatment of vanadium slag as an iron ore additive in the following ratio, wt.%:

Lime vanadium

waste oxidation processing vanadium shpak, 20-60

Known for the rest

Lime-vanadium waste oxidation-extraction treatment of vanadium slag, resulting from oxidative roasting, acid dissolution of vanadium slags and the subsequent separation of its components, contain, wt%: vanadium pentoxide / 1.5-2.5, oxides

iron oxide calcium 10-15; oxides KpeNiHHH 10-20; manganese oxides 5-10; oxides of homo, titanium, aluminum, etc. - the rest.

Vanadium oxides introduced by waste into the flux promote crystalline stabilization of glasses formed during the interaction of calcium oxides and silicon (for example, calcium orthosilicate), causing a corresponding hardening of the resulting agglomerate. In addition, an increase in the strength of the agglomerate with the introduction of lime-vanadium sludge into the flux is achieved by the interaction at relatively high sintering temperatures (1200-1400 ° C) of iron oxides and vanadium with obtaining very strong. spinel type compounds. Similar hardening occurs from the interaction with iron oxides of chromium and titanium oxides contained in. waste.

Another advantage of vanadium-containing flux is to increase the through extraction of vanadium, since the resulting waste is practically not used and their involvement in the technological cycle of metallurgical production significantly increases the processing efficiency of vanadium-containing raw materials in general. In addition, the economic feasibility of replacing the iron flux or sludge with vanadium-containing waste is dictated in the first case, with the exception of an additional stage — the stage of iron-flux production; and in the second, a decrease in the cost of sludge dewatering, which reduces the cost of the agglomerate. At the same time, vanadium oxides introduced with flux into the agglomerate — by restoring during blast-furnace smelting and switching to cast iron, significantly increase the level of mechanical and operational properties of the products obtained from these cast irons, which also provides significant savings

Example. On sintering area of 17 m at 1360s, agglomerated iron ore concentrate was sintering, including,%: eo5ch 57.8, Sr 12.4; CaO 5.7; - MPO 1.4; P 0.11, in the presence of limestone (known solution - option I), limestone and iron flux (known solution - option II), limestone and steelmaking sludge (known solution - option III and vanadium limestone-oxidative extraction extraction treatment sludge (the proposed solution is option IV). Taggneological sintering indicators are given in Table .- 1.

Table 1

Consumption of flux materials, kg / t (sinter)

limestone

sludge steelmaking flux

lime vanadium waste

Coke consumption.

Productivity, t / day

The yield of sinter grains larger than 10 mm,%

Basic agglomera

The chemical composition of the agglomerate,%

Re

o5sch P S V Consumption of flux materials, kg / t (sinter) limestone sludge of steelmaking iron flux of lime-vanadium wastes Coke consumption Capacity, 2200 2200 224 tons / day Consumption of sinter grains larger than 10%

300-450

200-300

220-300

120-140

40-60

40-60

45-60

2180-22002100-2200

32-38 30-36

4.94-2.411.82-2.02

43.2-45.443.4-45.2

0,12-0,130,12-0,13

Oh, 08-0,100,09-0,11

continuation of the table. 1 50 60 22 and 1 o f 200 ISO That 55 300 350 0 220 W TSH S TU 0 2260 2280 2280 2.02 2.02 Basic agglomerate The chemical composition of the agglomerate,%. Number of hours. Numerator - consumption, consumption,% From table. 1, it follows that the use of leveled waste in the flux composition without reducing the sintering agent productivity and increasing the consumption of coke, as well as a noticeable change in the composition of the agglomerate in terms of the main, determining the further redistribution, impurities 2 pasa) reduce lime consumption and, most importantly, increase the strength characteristics of the agglomerate. The yield of agglomerate with a grain size of more than 100 ml increased by almost 3 p with the application of the proposed flux in comparison with the known ones. From the agglomerate obtained with the use of the proposed flux, 1386 m were cast into foundry cast iron, content, wt.%: C 3.84-4.57; Si 1.76-2.24; Mp 0.72 Continuation of the table. 1 2.11 2.09. 2.02 1.98 kg / t} denominator 1, 3; Cr 0.21-0.64, V 0.24-0.67 / T1 0.12-0.28; .P 0.08-0.13 S 0.01770, 045. It was used for smelting, wear-resistant parts for domestic use. All, without exception, the mechanical and operational characteristics of the products obtained from the smelted iron were higher compared with the same indicators obtained from the iron, the sinter for which was prepared by ic using known fluxes. At the same time, some indicators (wear resistance and shock resistance) increased by 40-60%. The use of this raw material has a positive effect on the indicators of smelting iron in a blast furnace, increasing, within the stated limits, the uniformity of the charge mixture, productivity and extraction of vanadium into cast iron (see Table 2). table 2

Claims (1)

FLUX FOR PRODUCING AGLOMERATE, comprising limestone and iron ore additive, characterized in that, in order to increase the strength of the agglomerate, reduce its cost and increase the through extraction of vanadium, the flux contains lime-vanadium waste from the oxidative extraction treatment of vanadium as an iron ore additive slag in the following ratio of components, wt.%: Lime-vanadium waste oxidation-extraction processing of vanadium slag 20-60 Limestone Else sg ns