CN1044959A

CN1044959A - Low-aluminium silicon-titanium-iron alloy and manufacture method thereof

Info

Publication number: CN1044959A
Application number: CN 90100816
Authority: CN
Inventors: 崔西川; 崔志钦; 靳协成; 郭丙炎; 付海超; 牛铁良; 李红霞; 李三彤; 马继芬; 李五奎
Original assignee: GONGXIAN COUNTY JINHONG STONEWORKS
Current assignee: GONGXIAN COUNTY JINHONG STONEWORKS
Priority date: 1990-02-23
Filing date: 1990-02-23
Publication date: 1990-08-29
Also published as: CN1017811B

Abstract

The present invention relates to technique of ferro-titanium, it be a kind of with 65-95% ilmenite concentrate and the rutile of 5-35% make main raw material and produce content Ti 〉=30% with method for mixing according to a certain ratio, Si≤10%, the low-aluminium silicon-titanium-iron alloy product and the manufacture method thereof of Al≤4.0%, this product physical and chemical index have reached the required requirement of special stainless steel that Taiyuan Iron ﹠ Steel Corp of Ministry of Metallurgical Industry proposes.This product is used as the air release agent of steel-making and makes the additive of alloying element, in addition, also is used to make the coating of welding electrode.Be used as the quality that additive can improve stainless steel product, production cost and production FeTi ₃₀Compare and can reduce more than 2%, the rate of recovery of Ti is greater than 70%.

Description

Low-aluminium silicon-titanium-iron alloy and manufacture method thereof

The present invention relates to the technique of ferro-titanium in the metallurgy, especially for a kind of be the production method that main raw material is produced low-aluminium silicon-titanium-iron alloy with rutile, ilmenite concentrate.

At present, the domestic FeTi that mainly uses ₃₀As Stainless Steel Alloy element and air release agent, adopt thermite process production.According to GB GB3282-87 regulation, Ti content is 25-35% in this ferrotianium, and AL content＜8.5%, Si content are＜5.0%.In stainless production, what 30 ferrotianiums added lacks, and then the Ti composition does not reach index request, and reaches in the stainless steel of Ti composition requirement, and the content of Al but increases.In the stainless steel, it is high to contain the Al amount, and then the easy oxidation smooth finish in its surface is poor, forms hen-claw cracking, causes the stainless steel plate quality scale to reduce.If reduce the content of Al in 30 ferrotianiums, then the rate of recovery of metal titanium is low.

The objective of the invention is to avoid the weak point in the above-mentioned prior art, and a kind of new variety-low aluminium silicon titanium alloy and manufacture method thereof is provided.In the low-aluminium silicon-titanium-iron alloy that method is produced, the content of Ti is 30-40% in due order, and the content of Al is in≤4.0% this ferro-silico-titanium, the content of Si≤10%, (ferro-silicon Si15-20%) thus guarantee stainless steel produce in the rate of recovery of Cr.

The present invention is achieved in that

Production according to external ferro-silico-titanium, service condition and China's Special Alloy Steel are to the particular requirement of ferro-titanium variety and quality, the condition of producing rutile and ferro-titanium for many years in conjunction with our factory (Gongxian county, Henan Province rutile factory), we have taked with rutile, ilmenite concentrate is main raw material, improve processing parameter and work out new technological flow, in-house research and trial-produceed " low-aluminium silicon-titanium-iron alloy and manufacture method thereof " successfully, the Chemical Composition of its product sees attached list 1.

Details are as follows for manufacture method of the present invention:

In the prior art, produce FeTi ₃₀The time, use be TiO ₂Content is that the ilmenite concentrate of 49-52% is as main raw material, produce with this ilmenite concentrate that Ti and Al content locking phase should raise in the 30 ferro-titanium products, and the institute of ilmenite concentrate iron-holder own is gone into alloy and is reached the required iron amount of alloy ingredient, then concise material can't add the ferric oxide heat-generating agent, making like this in the slag to reclaim more than 10% by recoverable Ti less, at this problem, the low aluminium ferrosilicon-titanium alloy that manufacture method of the present invention is produced has just solved this problem.

Its concrete manufacture method is:

1, in the main raw material, rutile (first grade: TiO ₂〉=87%, S≤0.04%, P≤0.04%, C≤0.06) account for 5-35%, ilmenite concentrate (TiO ₂Content is 49-52%) account for 65-95%; Or contain TiO ₂〉=58% ilmenite concentrate (100%), or natural rutile (TiO ₂Content 〉=58%) (100%).The purpose of making is to improve TiO in the raw material like this ₂Content.

2, aluminum shot content is 90-98%, granularity 0-0.1mm＜10%, and 0.1-1.8mm＞90%.

3, batching:

Silicon titanium ratio in the alloy: Si/Ti is 0.17-0.32

Fe/TiO in the major ingredient ₂Be 0.48-0.60

Ti content is 30-40%.

All below 2mm, ferrosilicon adopts the 75# ferrosilicon to raw material granularity in all raw materials.

4, adopt strong heat-generating agent Potcrate (KClO ₃), consumption is that every 100Kg titanium material adds KClO ₃Be 1-5Kg, purpose is to improve reaction to guarantee hot fast reaction speed.In the product composition: Al≤4.0%, Si≤10%, Ti＞30%.

5, technical process:

Iron phosphorus → Potcrate (stirring) → add lime to stir.Ferrosilicon, aluminum shot stir.The ilmenite concentrate that roasting is good (temperature is 550 ℃-750 ℃) leaves in the heat-preservation cylinder.At first add rutile, add aluminium material, ferrosilicon mixture thereafter and successively be layered on above the ilmenite concentrate equably, mix and stirred 1 minute, add iron phosphorus, Potcrate, lime compound again, the temperature that stirs after 1 minute should be controlled at 200 ℃-250 ℃.

6, add aluminium-ferric oxide heat-generating agent at the bottom of the smelting furnace.

7, temperature control:

550-750 ℃ of ilmenite concentrate maturing temperature

Major ingredient mixes 200-250 ℃ of back temperature

200-250 ℃ of refining material temperature

Smelting furnace casing temperature 〉=110 ℃

Magnesia temperature 〉=150 ℃ at the bottom of the smelting furnace

8, charge calculation adopts MICROCOMPUTER PROCESSING.

9,6-9 minute tap to tap time

The embodiment of the invention:

Raw materials used and the source:

The artificial rutile our factory produces, first grade rutile, TiO ₂Content 〉=87%

Iron phosphorus Luoyang steel mill

Dressing-works, Wanning, ilmenite concentrate Hainan Province

This folder Tianjin, county mouth Lime Factory of lime

This county Potcrate factory content＞95% of Potcrate

Ferrosilicon this county 75# of ferrosilicon factory ferrosilicon

The aluminum shot our factory produces

Raw materials used Chemical Composition sees attached list 2

Raw materials used charger sheet sees attached list 3

A kind ofly can improve the low-aluminium silicon-titanium-iron alloy of stainless steel product quality as alloy addition, Ti content is 30-40% in its composition, Si≤10.0%, and Al≤4.0%, other Chemical Composition meets GB3282-87, the standard of FeTi30-A.Its manufacture method is:

In the main raw material, rutile accounts for 5-35%, ilmenite concentrate (TiO ₂Content is 49-52%) account for 65-95%, or adopt TiO ₂Ilmenite concentrate of content 〉=58% (100%) or natural rutile (TiO ₂〉=58%) (100%) is raw material; Aluminum shot aluminum content 90-98%, granularity 0-0.1mm≤10%, 0.1-1.8mm 〉=90%; In every 100Kg titaniferous materials, add the Potcrate of 1-5Kg; Si iron uses the 75# ferrosilicon;

Batching:

Si/Ti is 0.17-0.22 in the raw alloy

Fe/TiO in the major ingredient ₂Be 0.48-0.60

Ti content is 30-40%;

Working Procedure Controlling:

Aluminium material, ferrosilicon stir earlier;

Iron phosphorus, Potcrate stir;

Iron phosphorus, Potcrate stir with lime after stirring again;

Ilmenite concentrate, rutile and aluminum shot, ferrosilicon mixture stir;

After ilmenite concentrate, rutile and aluminum shot, ferrosilicon mix, carry out batch mixing with iron phosphorus, Potcrate, lime mixture again and stir;

Add aluminium-ferric oxide heat-generating agent at the bottom of the smelting furnace;

Reinforced the compound that has stirred while smelting, 6-9 minute tap to tap time.

The Chemical Composition of obtained product and performance index see attached list 4.

The physico-chemical analysis list of the obtained product 1(that sees Appendix is duplicate);

Accompanying drawing 1 is the low-aluminium silicon-titanium-iron alloy process flow sheet, and (1) in the schema, (2), (3), (4) are order of addition(of ingredients) number.

Positively effect of the present invention:

1, produces titanium content with ilmenite concentrate and increased a new technology for domestic, opened up a new production approach greater than 30% ferro-titanium series product.

2, new variety have been increased for titanium alloy.

3, this product is as additive, satisfied during China's stainless steel produces: Al＜0.05%, and Si＜1.0%, the requirement of Ti＜1.2% can improve the quality of stainless steel product significantly.

4, the low-aluminium silicon-titanium-iron alloy production cost of products is than the FeTi of our factory's production ₃₀The alloy product cost reduces more than 2%.

5, the smelting recovery of Ti is greater than 70%, and the rate of recovery of external titanium is 59.24%(to the maximum and sees: reference 4).

Subordinate list 1

Subordinate list 2

Material name	Chemical Composition＜% 〉
											TiO ₂	ΣFe	FeO	SiO ₂	Cao	Al	Si	kClO ₃	S	P	C	Granularity
	Rutile	87.88	2.4	1.62	3			0.02	0.002	0.03													40 order all-pass, 160 orders
Ilmenite concentrate											52.25	33.47	32.7	3					0.02	0.04	0.06
	Iron phosphorus		72.89	56.76	5			0.01	0.001	0.04													40 order all-pass
Aluminum shot																97.1	1					1.8mm all-pass
	Ferrosilicon powder					71.2			0.003	0.03													40 order all-pass
Lime														2	>85						0.03	The 2mm all-pass
	Potcrate						>95																The 2mm all-pass

Reference:

1, iron alloy metallurgy

[West Germany] G Volket chief editor, twilight sunset is translated

Science and technology society in Shanghai publishes, in October, 1978 first version book number: 15119.1938

2, ferroalloy smelting

[Soviet Union] M.A Leix work, Zhou Jinhua, Yu Zhongyi

Beijing metallurgical industry press publishes, the second impression in October, 1986

Book number: 15062.3743

3, brief talk the production and the application (literary composition) of titaniferous alloying constituent

Author: Mo Shuchi, Wang Zuoyao, Li Rongxun

General Institute of Iron and Steel, Ministry of＜atallurgical Industry

The fifth phase in 1987 " iron alloy " magazine

4, al-si-thermal method reduction beach sand, ilmenite

Yang Yucheng is translated from " Transactions of the indian institute of Metal " Vol.37, No.3, and June 1984

Claims

1, a kind ofly can improve the low-aluminium silicon-titanium-iron alloy of stainless steel product quality, it is characterized in that Tl content is 30-40% in its composition, Si≤10.0%, Al≤4.0% as alloy addition.

2, low-aluminium silicon-titanium-iron alloy according to claim 1, being characterized as of its manufacture method:

In a, the main raw material, rutile accounts for 5-35%, and ilmenite concentrate accounts for 65-95%,

B, aluminum shot aluminum content are 90-98%, granularity 0-0.1mm≤10%, and 0.1-1.8mm 〉=90%,

C, every 100Kg contain TiO ₂In the raw material, add the potassium aluminate of 1-5Kg,

D, ferrosilicon use the 75# ferrosilicon, granularity＜2mm,

E, batching:

Si/Ti is 0.17-0.32 in the alloy,

Ti content is 30-40%.

Fe/TiO in the major ingredient ₂Be 0.48-0.60

At the bottom of the smelting furnace, add aluminium-ferric oxide heat-generating agent,

F, Working Procedure Controlling:

Aluminum shot, ferrosilicon stir earlier,

Iron phosphorus, Potcrate stir,

Iron phosphorus, Potcrate stir with lime after stirring again,

Ilmenite concentrate, rutile and aluminum shot, ferrosilicon mixture stirred 1 minute,

Stirred 1 minute with iron phosphorus, Potcrate, lime mixture again behind ilmenite concentrate, rutile and aluminum shot, the ferrosilicon mixture,

Be 6-9 minute tap to tap time.

3,, it is characterized in that the TiO of said ilmenite concentrate in the main raw material according to claim 1,2 described low-aluminium silicon-titanium-iron alloys ₂Content is 49-52%, and rutile is our factory's product first grade, wherein, and TiO ₂〉=87%, S≤0.04%, P≤0.04%, C≤0.06%.