SU1182086A1 - Blast furnace additive for overall alloying of cast iron - Google Patents

Abstract

The use of bottom residues of vanadium shpak - waste complex pyrometallurgical and physico-mechanical processing, containing, wt.%: 15-25 Iron oxides 5-10 Vanadium oxides 3-7 Chromium oxides 3-7 Titanium oxides 3-7 Manganese oxides 8-12 Oxides silicon 0.4–1.5 Carbon Metallic Iron Granules Rest (P as a blast furnace for complex alloying of cast iron.

Description

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About 00 Oi 1 The invention relates to ferrous metallurgy more specifically to the production of chromium alloyed chromium, vanadium and titanium, obtained in blast furnaces from complex ores. The purpose of the invention is to reduce the intensity of grenale formation, increase the extraction of iron and alloying components in iron and reduce coke consumption. As a blast furnace for bottom doping of cast iron, bottom residues of vanadium slag, including oxides g (2heels, vanadium, chrome, titanium, manganese, silicon , as well as metallic iron granules and carbon, in the following ratio, wt.%: Iron oxides 15-25 Vanadium oxides 5-10 Chromium oxides 3-7 Titanium oxides 3-7 Manganese oxides 3-7 Silicon oxides 8-12 Carbon 0, 4-1.5 In this case, metallic iron granules are predominantly spherical in shape with an average diameter of 0.2–5 cm and consist of two layers, the inner one of which is metallic iron, and the outer, strongly adhered to the inner, solid chemical solution stable complex spinelide in iron silicates at a ratio of 1: (1-1.5; this material differs from the known ones by a higher level (several times) in it the concentration of vanadium oxides, as well as chromium, as well as significantly more soda Pieces of metallic iron, and less carbon. Taken together, these changes favorably affect (when using the proposed material in the blast furnace smelting of titanomagnetite ores) indicators, mind the intensity of grenale formation, increasing the extraction of iron and alloying components, reducing coke consumption. This is primarily due to the increase in the amount of metallic iron in the granules, which significantly reduces the content of ferrous oxide in the primary slags and, consequently, reduces the possibility of the formation of refractory accumulations of oxycarbonitrides on the surface of the coke. In addition, increasing the metallic iron content improves the flow of materials, increasing the throughput of the hearth furnace. Another advantage of the additive is that it reduces the ability of the primary ferruterous shpak to form, upon contact with carbon, heterogeneous gas-slag suspensions that are stable in the presence of titanium compounds. This, in turn, is a consequence of the influence of oxides, chromium, titanium and vanadium, which are part of the material, which significantly reduce the activity of iron oxide in the proposed range. At the same time, a simultaneous decrease in the carbon content in the material also contributes ultimately to a decrease in the accumulation of oxycarbonitrides and, therefore, grenal in the furnace hearth. Taken together, all of these ratios, primarily the metallic iron content in the material and its granulometric composition, as well as the mineralogical composition covering the slag binder granules, transfer the preferential interval of maximum carbonitride phase in the furnace hearth to the zone of higher temperatures. This makes it possible to melt titanomagnetite more hotly and to raise the temperature of the iron not exceeding the consumption of coke. The proposed material is obtained as follows. Usually, after blowing vanadium iron in the converter, vanadium slag is separated from the obtained metal of the carbon intermediate product without first performing any technological operations. According to the invention, the vanadium shpak, after separation of the carbonaceous intermediate, is heated by oxidative blasting, fed from above or through the bottom of the converter. The heated slag is puddled into the slag and after cooling and subsequent magnetomechanical cutting, so-called bottom residues are formed. 3 representing a conglomerate of metal granules with oxides of the slag obtained by blowing. This material is recommended and used as an additive for blast-furnace smelting titanomagnes; tites. Example. In an industrial house furnace, cast iron from titanium magnetite thrusters doped with chromium, vanadium and titanium according to the usual technology (1-base variant) using an additive adopted as a prototype (II variant) and using the proposed material (111 variant) was smelted. The main part of the iron ore mixture consisted of pellets and sinter of titanium-magnetite ores from the Kachkanar deposit. Technological indicators of the operation of the blast furnace for these three options are given in table. 1, from which it follows that the proposed addition can significantly increase the extraction of iron 86 from the raw material and alloying components, reduce coke consumption and increase the cast iron recipe. An increase in the extraction of iron and other components into the cast iron shows that this material contributes to a reduction in the development of the processes of grenale formation, which leads to a decrease in the loss of pig iron with slag. The advantage of the proposed material is that, ceteris paribus, it allows for a hotter blast furnace course and, therefore, an increase in the temperature of the iron, which is not achieved using known materials. From the data table. 2 it follows, however, that the aforementioned indicators are achieved with a certain ratio of the components forming the material, the particle size distribution of the metal component and the mineralogical composition of the slag bond. Table 1

Additive consumption, kg / tProductivity, t / s

Coke consumption, kg / t

Iron content

in charge with

additives,%

Content in cast iron,%:

flint

manganese

vanadium

chrome

titanium

phosphorus

sulfur

20

90

2150

2095

460

476

55.4 56.5

Slag content, CaO

Cr, 0

 Have

Tio

Exit pshaka Extract,

gland

chrome

vanadium

titanium temperature

Continued table. four

Claims (1)

The use of bottom residues of vanadium slag - waste complex pyrometallurgical and physico-mechanical processing, containing, wt.%: Iron oxides 15-25 Vanadium oxides 5-10 Chromium oxides 3-7 Titanium oxides 3-7 Manganese oxides 3-7 Silicon oxides 8-12 Carbon 0.4-1.5 Metallic iron granules Else as a blast furnace for complex alloying of cast iron. hell zi, 1182086 one 1182086 2