CN101016597A - Process of producing iron alloy with low carbon and chromium - Google Patents

Abstract

The invention discloses a preparing craft of low-micro carbon chromium iron alloy, which comprises the following steps: 1) loading high carbon chromium iron into medium-frequency induction furnace; melting; heating-up at above 1600 deg.c; pouring into tank; 2) transferring the tank to station; air refining; 3) taking-up oxygen gun; inserting argon oxygen gun into solution liquid level 300-400mm of tank; setting the discharge of oxygen at 300-500 L/min; blowing at 5 min with argon oxygen ratio at 1 : 3; blowing at 5 min with argon oxygen ratio at 1 : 2; blowing at 5 min with argon oxygen ratio at 1 : 1; adding into silicon iron; 4) transferring the tank into vacuum chamber; switching in argon oxygen pipe at the bottom of tank; blowing into argon oxygen mixed gas; controlling the discharge capacity of argon gas at 150-250 L/min, discharge capacity of oxygen at 40-80 L/min, vacuum degree at 5-200Pa and time of air refining at 20-30 min; 5) relieving the vacuum; hanging the tank to casting position; casting; getting the product. The good effect of this invention is: simple producing craft; high productive efficiency; low power; good environment; low cost.

Description

The production technique of iron alloy with low carbon and chromium

Technical field

The present invention relates to a kind of production technique of iron alloy with low carbon and chromium.

Background technology

The production technique that present humble carbon chromium is iron alloy has three kinds, is smelted by raw ore for first kind, not only is subjected to the restriction of Mineral resources, and need two hot stove duplexs in ore deposit to produce, it mixes and dashes and need repeatedly carry out, and the recovery rate of chromium is lower, and production environment is relatively poor, seriously polluted, product power consumption height, the production cost height, the quantity of slag of generation is big, chromium sesquioxide content is higher in the slag, and this technology is subjected to the restriction of national industrial policies; Second kind is to adopt the production of vacuum resistance oven process by the high carbon ferro-chrome alloy, and production link is more, and environmental pollution is laid particular stress on, and the product power consumption is big, and the production cycle is long, and efficient is low, and the maintenance of equipment difficulty is big, and the product inclusion can't be removed, the production cost height; The third is electrolytic process production, this method complex process, and seriously polluted energy consumption is big, and the cost height is subjected to the restriction of national industrial policies.

Summary of the invention

It is little to the purpose of this invention is to provide a kind of pollution, and energy consumption is little, the production technique of the iron alloy with low carbon and chromium of constant product quality.

The objective of the invention is to realize in the following way: a kind of production technique of iron alloy with low carbon and chromium, its technology is:

1), high carbon ferro-chrome is packed in the medium-frequency induction furnace, fusing is warming up to more than 1600 ℃, pours in the tank body;

2), tank body is moved into station, at jar mouth dress dust excluding hood, open dedusting fan, insert oxygen gun blowing in jar, the oxygen rifle inserts the argon pipe apart from liquid level 400-800mm at the bottom of jar, Argon, argon blowing rate be controlled at the 30-100 liter/minute; Elder generation's low oxygen pressure blowing, oxygen blast pressure 0.6 ± 0.05mPa blew 2-4 minute, and oxygen blast pressure is risen to 0.8 ± 0.05mPa, added chrome ore and aluminium calcium pre-melted slag simultaneously, observed a jar mouthful flame, after flame shrinks, continued blowing 4-8 minute;

3), take out the oxygen rifle, argon oxygen rifle is inserted tank body liquation liquid level 300-400mm, oxygen flow be the 300-500 liter/minute, press earlier argon oxygen than blowing in 1: 35 minutes, press argon oxygen again than blowing in 1: 25 minutes, press argon oxygen then, add ferrosilicon simultaneously than blowing in 1: 15 minutes;

4), tank body is moved in the vacuum chamber, insert argon oxygen pipe, be blown into the argon oxygen gas mixture in tank base, argon flow amount be the 150-250 liter/minute, oxygen flow be the 40-80 liter/minute, vacuum degree control blew 20-30 minute at 5-200Pa;

5), remove vacuum, tank body is winched to the cast of cast position, finished product.

The present invention has following beneficial effect: the one, and production technique is simplified greatly, and the particularly introducing of argon oxygen and vacuum-treat technology makes blowing technology become and can produce iron alloy with low carbon and chromium by producing the medium carbon ferrochrome alloy; The 2nd, production efficiency improves, and the LAVOD stove hourly output of ton nominal capacity can reach 1 ton of production capacity, can improve 1.5-3 doubly than traditional technology; The 3rd, energy consumption is low, and the products production power consumption is lower than the 900kwh/ ton; The 4th, production environment is good, and water of productive use is recirculated water entirely, and refining process waste gas is all by dust removal process, no noxious gas emission, and producing a small amount of waste residue is CrO-Al ₂O ₃-SiO ₂Be slag, Cr ₂O ₃＜1%, nontoxic; The 5th, production cost reduces greatly, because the reduction of power consumption, the raising of production efficiency, Cr in the slag ₂O ₃Loss less than 1%, product cost per ton can reduce about 1000 yuan; The 6th, good quality of product, because bottom blowing rare gas element and vacuum refinement reduce the gas content in the alloy, inclusion is effectively removed, the alloy that this method is produced has higher cleanliness factor and low gas content, helps the production of Clean Steel.

Embodiment

The present invention will be further described below in conjunction with embodiment:

The equipment configuration: 1, the 1000Kg medium-frequency induction furnace is one; 2, the heat size ratio is 0.85, liner magnesia fire-protecting wall, one of the 1500Kg capacity tank body of bottom installation gas permeable brick; 3, blowing is overlapped with Lavalle type spray gun and elevator one thereof; 4,12m ³The liquid oxygen jar is joined 10m ³Gasifying pot and supply air line and Controlling System one cover; 5,8m ³The liquid argon jar is joined 5m ³Gasifying pot and supply air line and Controlling System one cover; 6, telescoping top blast insert argon oxygen rifle and elevator one cover thereof; 7, vacuum unit one cover; 8, vacuum chamber is one; 9, charging system one cover; 10, sack cleaner one cover; 11, the finishing crusher is one.

Embodiment 1:

The production of extra low carbon ferrochromium alloy:

1), weighing 1100Kg high carbon ferro-chrome packs in the medium-frequency induction furnace of 1000Kg, fusing is warming up to more than 1600 ℃, pours in the tank body;

2), the tank body that will fill the high carbon ferro-chrome liquation moves into LAVOD stove blowing station, at jar mouth dress dust excluding hood, opens the bag-type dust blower fan, in jar, insert Lavalle type oxygen blowing lance oxygen blast, the oxygen rifle inserts argon pipe Argon apart from liquid level 400-800mm at the bottom of jar, argon blowing rate is controlled at 50 liters/minute; Elder generation's low oxygen pressure blowing, oxygen blast pressure 0.6mPa blew after 3 minutes, and oxygen blast pressure is risen to the 0.8mPa blowing, added 50Kg chrome ore and 100-200Kg aluminium calcium pre-melted slag simultaneously, observed a jar mouthful flame, after flame shrinks, continued blowing 5 minutes;

3), take out the oxygen rifle, Lavalle type spray argon oxygen rifle is inserted in the tank body liquation, the degree of depth is 300mm, oxygen flow be the 300-500 liter/minute, press earlier argon oxygen than blowing in 1: 35 minutes, press argon oxygen again than blowing in 1: 25 minutes, press argon oxygen then, add the chromium that ferrosilicon is used for reducing slag simultaneously than blowing in 1: 15 minutes;

4), tank body is moved in the vacuum chamber, insert argon oxygen pipe in tank base, be blown into the argon oxygen gas mixture, argon flow amount is 200 liters/minute, oxygen flow be the 40-80 liter/minute, vacuum degree control blew 20-30 minute at 5-200Pa;

5), remove vacuum, tank body is winched to the cast of cast position, ingot bar is become the finished product of certain particle size with the finishing of finishing crusher, packing is put in storage.

Claims (1)

1, a kind of production technique of iron alloy with low carbon and chromium, its technology is:

1), high carbon ferro-chrome is packed in the medium-frequency induction furnace, fusing is warming up to more than 1600 ℃, pours in the tank body;

2), tank body is moved into station, at jar mouth dress dust excluding hood, open dedusting fan, insert oxygen gun blowing in jar, the oxygen rifle inserts the argon pipe apart from liquid level 400-800mm at the bottom of jar, Argon, argon blowing rate be controlled at the 30-100 liter/minute; Elder generation's low oxygen pressure blowing, oxygen blast pressure 0.6 ± 0.05mPa blew 2-4 minute, and oxygen blast pressure is risen to 0.8 ± 0.05mPa, added chrome ore and aluminium calcium pre-melted slag simultaneously, observed a jar mouthful flame, after flame shrinks, continued blowing 4-8 minute;

3), take out the oxygen rifle, argon oxygen rifle is inserted tank body liquation liquid level 300-400mm, oxygen flow be the 300-500 liter/minute, press earlier argon oxygen than blowing in 1: 35 minutes, press argon oxygen again than blowing in 1: 25 minutes, press argon oxygen then, add ferrosilicon simultaneously than blowing in 1: 15 minutes;

4), tank body is moved in the vacuum chamber, insert argon oxygen pipe, be blown into the argon oxygen gas mixture in tank base, argon flow amount be the 150-250 liter/minute, oxygen flow be the 40-80 liter/minute, vacuum degree control blew 20-30 minute at 5-200Pa;

5), remove vacuum, tank body is winched to the cast of cast position, finished product.