SU1611969A1 - Method of vanadium alloys - Google Patents

Abstract

The invention relates to the production of ferroalloys, in particular to the preparation of ferrovanadium. The aim of the invention is to increase the recovery rate of vanadium into the alloy. The method consists in loading into the converter reducing agents for selective reduction of iron in an amount that provides 7.6-15% iron oxides in enriched vanadium melt, and lime is introduced into the converter and the ladle to obtain basic waste slag 0.9-1.6 . In addition, after the reducing agents are loaded into the converter, carbon-containing materials are used to selectively reduce iron to the melt at the rate of 1–8% carbon based on the mass of reduced iron. The proposed method provides optimal process performance with high productivity and low vanadium losses. 1 hp f-ly, 1 tab.

Description

The invention relates to the production of ferroalloys, in particular to the preparation of ferrovanadium.

The aim of the invention is to increase the degree of vanadium extraction into the alloy.

In the method of producing vanadium alloys, including the melting of vanadium-containing non-metallic materials and lime, selective reduction of iron from the melt, separation of the metal and vanadium-rich oxides of the melt, reduction of vanadium, iron, manganese and other components from the enriched melt are carried out.

Selective reduction of iron from oxides with a chain of enrichment of the melt with vanadium oxides and ialucation from this melt is a vanadium alloy with a relatively high vanadium content (20-28%) with a residual content of iron oxides in the melt of 7.6-15% significantly reduces the loss of vanadium reduced by iron (e; 053%). At the same time, the basicity of the final shpak as a ratio of calcium and magnesium to silica within 0.9-1.6 contributes to maintaining sufficient liquid mobility of the shpak, its satisfactory separation from the alloy and very complete recovery of the wound from slag.

Significant impact on the quality of vanadium alloy (content of baS5

WITH

cn with

Nadi in this alloy produces the rs-of-that of the separation of selectively reduced iron from the enriched melt. The more this iron remains; nets in enriched slag melt; the lower the vanadium content in the final alloy. It is known that selectively reduced iron contains traces of silicon (YO, 05%) and carbon-: genus (0.03%). This iron has a high oxygen content (0.1%). Such a metal, as is known, has low interfacial tension with a wafer phase and is very poorly separated from the spike. An interfacial tension increase between the metaplastic and slag phases is proposed after the addition of reducing agents (FeSi, A1) to selectively reduce iron before releasing the carbon-containing component (coal, coking, carbon black briquettes, etc.) into the molten ladle. the amount of 1.0-8% carbon by weight of reduced iron. The carbon of this component reduces the content of oxygen and iron, while the reduced iron has a carbon content of 0.2–1.0%, which provides an increase in the interfacial tension and, accordingly, a sufficiently complete separation of the metal from the enriched vanadium slag melt.

When the content of iron oxides in the oxide-rich vanadium melt is less than 7.6%, vanadium is reduced along with iron, which leads to additional vanadium losses. If in the vanadium-rich melt with oxides, the residual content of iron oxides is more than 15%, in the finished alloy the vanadium content is relatively low (l20%). The use of such an alloy for alloying steels is not rational enough, since for its dissolution in the liquid metal it is necessary to overheat the metal in the steelmaking unit, which leads to additional energy consumption, reduction of the service of refractories, and a decrease in the quality of the metal.

The basicity of the final (waste) slag has a significant effect on the completeness of the regeneration of vanadium from slag melt during the final production of the alloy So

slag basicity

(CSO.MSO) 0.9

Sio

in the melt there will be a lot of silicic acid not bound in silicates of calcium silicate, which forms difficult-to-repair compounds with vanadium oxides. This will reduce the recovery of vanadium oxides from slag melt and thus increase the loss of vanadium with drain plugs. High basicity of the final pin

(

CaO + MgO

SiO,

 g

-) 1, 0 makes it difficult to maintain

five

0

0

five

0

five

0

five

process. Thus, with a high CaO content in the slag melt, during the period of selective reduction of iron, vanadium is reduced with iron, which is undesirable (vanadium losses increase). In addition, a final slag with a high CaO content in the amount of MgO will not be sufficiently fluid, which makes it very difficult to separate the alloy from the slag (a large amount of metal remains in the metal)

The selected limiting contents of the amount of carbon-containing component to be reduced are 1–8.0% of the weight of reduced iron to ensure optimal process performance. So, if you plant less than 1% carbon: on the amount of iron produced, when the content of iron oxides in vanadium-enriched vanadium melts is closer to the upper limit (12-15%), a significant amount of carbon is spent on reducing the iron oxides, and the reduced iron it remains with a high content of oxygen, has a low interfacial tension and, accordingly, is poorly separated from the slag. If the carbon-containing component is added to the slag melt in quantities that provide a carbon content of more than 8% by weight of reduced iron, this will lead to a decrease in iron oxides in the vanadium-rich slag melt and, accordingly, reduction of the vanadium together with iron and sulfur alloy within the allowable limits.

Example 1. In the converter with gas-oxygen and neutral-gas blast (capacity 7.6 m) load 3 tons of vanadium slag and 1.2 tons of lime. The chemical composition of the main components of the slag,%:. 18.1, Fe (total) 29.5; 17.0. In addition, in vanadium slag 10% is 51.

tal (iron bead, entangled in this slag). Melting of the charge charged to the converter is carried out by feeding oxygen 25 and natural gas 10 m / min through bottom tuyeres. The mixture is completely melted in 40-50 minutes. The chemical composition of the melt,%: 11.6, Fe (total) 23.9. At a temperature of melt melt, 350 kg of FeSi 75% and 130 kg A1 are placed in the converter. At the same time, neutral gas 12 and receiving gas 3.5 m / min are supplied through bottom tuyeres. The melt is stirred for 7 minutes taking into account the time of the reducing agent additives and is poured into the ladle with a bottom sliding gate. Before draining into the converter, 35 kg of coal ASh is loaded. In the ladle, the melt was held for 8 minutes, the spit enriched with vanadium oxides and the reduced metal was separated, the metal was poured into the container through the bottom slide gate, and the slag was transferred to another ladle or left in the same ladle, if its capacity allowed recovery period with obtaining vanadium alloy. The chemical composition of selectively reduced iron,% C 0.2, Si 0.03, Mp 0.02, V 6.3, Cg 0.02, iron is the rest. The amount of reduced iron is 950 kg. The chemical composition of slag melt enriched with vanadium oxides,%: 12.5, FeO 8.2. After the iron separation, a ladle with slag melt is placed on a stand with a blowing tuyere. Reducing agents are loaded onto the slag melt — 600 kg (75%) and 250 kg of fused aluminum. Fractional material is up to 25 mm and the melt is mixed with neutral gas, which is fed through a submerged tuyere. To maintain the optimum temperature of the melt (1600-1650 ° C), piece of lime or lime is applied to the pile in an amount of 120 kg. Stirring is continued for 12 minutes. Thereafter, a lug is made in the ladle to completely separate the keb and the alloy (8 min). Slag and metal are alternately poured into containers. At the same time receive 1175 kg of an alloy of chemical composition,%: C 0.15} W 6.8; S 0.02; P 0.035; V 26.4; Cr 0.06, Si 12.2} Fe else. Drain slag contains,%: 0.65; FeO 0.4; CaO 32.0; SiOj, 35.0; MgO 2.4; 23.0; Tioj. 6.1}, 2.2.

96

The basicity of the drain slag

(- M8Q) 0 98 SiO

Example 2. In the converter with bottom gas-oxygen and neutral gas blast with a capacity of 7.6 m load 3.5 tons of vanadium slag containing,%: 18.5; Fe (total)

32.0; SiO 16.5; #IO 9.0; CaO 3,5; TiO 8.4; , 2.5; KgO 4.5, Alj, 05 3-, 5. As part of the slag, the metal part is 10.5% of the total mass of the slag, and the mixture also

   to lime. The mixture is melted in a converter by supplying 23 M3 / min of oxygen and 8.5 of natural gas to bottom burners. Duration P: melting 50 min.

In the melt with te fflepatipoy 1450 with

FeSi is placed 550 kg (75%) and mixed with compressor air at a rate of 10 for 8 MiiH and then drained into a ladle with a bottom slide gate. Before draining, 70 kg of coal ASh is loaded into the converter. In the ladle, the melt is melted for 6 minutes, the metal is poured into the tank through the gate opening, and the enriched slag

in the bucket set on the stand with a blowing device. The amount of reduced iron is 920 kg. The chemical composition of the selectively reduced metal,%: C 0.60; Si 0.02; Mp 0.03; S 0.033; P 0.042; V 0.29;

Cg 0.02; iron else. The enriched slag contains,%: v., 0t- M 7- FeO 13.9.

The melt is mixed with neutral gas, 700 kg are loaded into the ladle

FeSi (75%) and 250 kg of fused aluminum. The duration of mixing is 10 minutes, then for 8 minutes the melt is held in the ladle to completely separate the alloy and slag and poured into various containers.

Get 1580 kg of alloy composition,%: C 0.45, W 7.1; Si 14.5; S 0.015; P 0.04; V 21.8; Cr 0.4; Ti 0.5, the rest.

Drain slag has a chemical coag,%: CaO 46; SiO 36.6; MPO 2.1; eO 0.33; V 0.25, MgO 7.4 ,. , 9.1.

55

The basicity of the drain slag

, CaO + MgO. ., (577Г).

SiO.

The table presents the use of the method.

formula of invention

 1. A method of producing vanadium alloys S which includes the melting of vanadium-containing non-metallic materials and lime, selective reduction of a part of iron from the melt, separation of the metal and enriched vanadium oxide of the melt, reduction of vanadium, iron, manganese and other components of the enriched melt, in order to increase the degree of extraction of the vanadium into the alloy, the reducing agent for the selective reduction

Iron is loaded into the converter in an amount that provides 7.6–15.0% of iron oxides in the oxide-rich Va: nadi melt, and lime is introduced into the converter and the ladle to obtain basicity of the draining pork 0.9–1.6,

2, Method POP.1, is different from the fact that after loading into the converter, rehabilitate for the selective reduction of iron, carbon-containing materials are applied to the melt at the rate of 1.0–8.0% of carbon based on the mass of reduced iron.

boundary conditions

Soderkan 1e iron oxides

after selective reduction

FeO iron 6.6%

Solidity -.22 ° -t o; 7 plums

whom .elaka

8 kg of All coal with a reduced kepaz weight of 1200 kg. ContainsEmoxides of iron oxides after the recovery of the same. FeO I impurity Drainage slag

.JM „o gg

Slog

35 angle ASh with a weight of reduced iron of 930 kg. The content of occlos nephez after selective reduction of iron with FeO is 13.9%. Basis of drain shpak

.. ",. 1 /, 6

B10 „

70 kg of coal AN with a weight of 16.6 kg of reduced iron

Soderkaia kelea oxides after selective reduction of FeO gels 18%

Basicity from a well-made cuspist Cao HzO „g

100 kg. Angle lb with weight

iron in / jcr

0.45

0.29

0.25

Vanadium min

five

0.85

Insufficient zhmdkopo-

DEDICATED

2.5

0.65

The content of va-nadn in Sshawa is closer to the lower limit (20.0%)

Increase iron vanadium with reduced iron Loss of alloy in slags in the form of beads 7-10% by weight of melting

Claims (3)

The claims 1. A method for producing vanadium alloys, including the melting of vanadium-containing non-metallic materials and lime, the selective reduction of part of the iron from the melt, the separation of the metal and the vanadium oxide-rich melt, the reduction of vanadium, iron, manganese and other components from the enriched melt, distinguish The fact is that, in order to increase the degree of extraction of vanadium into the alloy, a reducing agent for the selective reduction of iron is loaded into the converter in an amount that provides in the melt enriched with vanadium oxides, 7.6-15.0% of iron oxides., and lime is introduced into the converter and the ladle to obtain the basicity of the drain rod 0.9-1.6, 2. The method according to claim 1, characterized in that after loading reductants into the converter for selective reduction of iron, carbon-containing materials are added to the melt at the rate of 1.0-8.0% of carbon by weight of reduced iron. ¹ Boundary conditions The vanadium content in the alloy,% The amount of carbon,% The final slag consistency Loss of vanadium, % Note in iron in alloy in reduced iron in final slag Iron Oxide Content 24 „6 after selective reduction of iron FeO Basic yutak = 6.6% -CaO + MgO S10 * = 0j7 discharge 0.02 0.10 Liquid . ³ > ° 5,0 Significant moving vanadium loss ny in reduced iron in the form with drained slag. 8 kg of AN coal with a reduced iron weight of 1200 kg The content of iron oxides after selective reduction of the same.left? ЕО * = 8 _S 2 5 ^a 2 ♦ Y & 2. = 0, 98 and x0 ^ 35 kg of ASh coal with a reduced iron weight of 950 kg. Nepez Oxides after Selective Reduction of Iron FeO ^from 13.92 The basicity of drain piac CaO _. * MgO „ _{j> 46} SiOg 70 kg of AN coal with a reduced iron weight of 920 kg 26,4 21.8 The content of oxides of kelez after 14.8 selective reduction of iron FeO = 18% Drain Clack Mainity CaO + MgO „<q SiOg ’ 100 kg. Of ASh with a reduced iron weight of 840 kg 0.20 0.15 Also 0.3 0.65 Minimum teri vanadium. Optimal holding vanadium in alloy 0.6. 0.45 1.5 0.85 0.29 0.25 Vanadium Loss Lack of 2.5 2.55 TO4HL The vanadium content in the alloy is closer to the lower limit (20, OX). Loss of vanadium with reduced iron. Potern of the alloy IN DRAIN 4 slag in the form of kings 7-1 OX of the weight of the melt.