CN1105393A - Method for directly smelting iron-base amorphous mother alloy from szaibelyite and boron-rich slag - Google Patents
Method for directly smelting iron-base amorphous mother alloy from szaibelyite and boron-rich slag Download PDFInfo
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- CN1105393A CN1105393A CN 94110021 CN94110021A CN1105393A CN 1105393 A CN1105393 A CN 1105393A CN 94110021 CN94110021 CN 94110021 CN 94110021 A CN94110021 A CN 94110021A CN 1105393 A CN1105393 A CN 1105393A
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Abstract
The process for directly smelting Fe-base amorphous mother alloy in dc plasma furnace includes premixing szaibelyite, or B-rich slag, or directly reduced paigeite as raw material with coke or anthracite coal and silicon iron as reducer, pre-smelting pig iron and waste steel in dc plasma furnace with carbon lining to form high-temp. iron bath, said mixture being carried by argon into arc region from central hole of electrode, where FeSiB amorphous mother alloy is directly smelted by reduction with C-Si compounding heat. It features simple technology, high yield and low cost.
Description
The present invention relates to a kind of method of ferroalloy smelting.
The raw material of iron-based non-crystalline material is FeB and other alloy.The production technique of FeB is divided into thermite process (claiming perrin process again) and electric furnace process.Electric furnace process connects the reductive agent difference and is divided into carbothermy and electro-silicothermic process again.China produces FeB and adopts thermite process and electro-silicothermic process more.As reductive agent, electro-silicothermic process is made reductive agent with FeSi to thermite process with aluminum magnesium alloy, and with aluminium reduction eventually, its raw material is boric anhydride or boric acid, United States Patent (USP) the 4397691, the 4505745th, and the method for FeSiB alloy is produced in the blast furnace carbothermic reduction of Kawasaki, Japan steel company.The direct current plasma electric arc furnace has been invented by Sweden ASEA company, and hollow electrode is reinforced, and carbothermic reduction is with the method (INFACON86, P332-34) of low brilliant position chrome ore production medium carbon ferrochrome.The FeB production technique is varied according to raw material or reductive agent difference, owing to aluminium, magnesium, boric anhydride or boric acid cost an arm and a leg, to making the FeB production cost very high; Make aluminium content height among the FeB with aluminium reducing, high alumina FeB need fall the aluminium processing as the raw material of iron-based non-crystalline material because aluminium is harmful element, has then increased production cost again.
The method that the purpose of this invention is to provide a kind of direct smelting iron-based amorphous master alloy, this method can significantly reduce production costs.
The present invention's standard of getting the raw materials ready: (percentage composition that the present invention relates to is weight percentage)
Raw material: boron magnesium ore deposit, oxidizing roasting, t 〉=900 ℃, granularity≤6mm
Rich boron slag: directly reduce paigeite, drying treatment, t 〉=120 ℃, granularity≤6mm
Reductive agent: coke powder or pulverized anthracite,
〉=70%, W
f＜1%, granularity≤6mm
Ferrosilicon powder: Si=30%～80% granularity≤6mm
Iron and steel stock: the pig iron, steel scrap
Subsidiary material: lime, fluorite, argon gas.
With any raw material, carbonaceous reducing agent and ferrosilicon in 1: 0.2～0.4: 0.1～0.4 ratio pre-mixing, compound keeps dry, put into furnace top bin, the pig iron, steel scrap are packed in the direct current plasma stove of carbonaceous furnace lining, the striking melting waste steel also rises to the metal pool temperature more than 1650 ℃, compound all enters arc region fusing, regularly deslagging by centre hole of electrode under argon gas carries.Before deslagging, in stove, evenly add a small amount of clean iron filings by the top filling hole, with the boron in the sedimentation slag, finish the compound thermal reduction of carbon-silicon.Before smelting end, add a small amount of lime and fluorite in stove, after the slag fusing, slag iron mixes out, after the condensation, separates slag iron, iron alloy fragmentation, packing.
Under the plasma arc temperature, material melts concurrent biochemical reaction rapidly, and the B that restores enters metal pool and forms FeB, and slag is pushed under arc voltage around the molten bath, a small amount of material by electric-arc gasification with outside the furnace gas effusion stove.
Argon gas is as plasma (orifice) gas, and plays a part to stop furnace gas along the reverse rising of centre hole of electrode, also reduced the dividing potential drop of reaction product carbon monoxide simultaneously in arc region, helps reaction forward and carries out, and is similar to the effect of vacuum metallurgy.Because being reflected at the metal pool surface carries out, the existence of Fe has reduced B
2O
3Reduction temperature, high-temperature plasma arc vertically downward provides very favourable chemical thermodynamics and reacting dynamics condition.
Allocate the Si of compound into the ferrosilicon powder form, part is as reductive agent and B
2O
3Reaction forms SiO
2Enter slag, all the other enter metal pool as alloying element.Adjust slag basicity according to smelting needs, regularly deslagging before deslagging, evenly adds a small amount of clean iron filings by the top filling hole in stove, with the B in the sedimentation slag, improves the B recovery rate.
Characteristics of the present invention are to be raw material with boron magnesium ore deposit or rich boron slag, directly smelt the FeSiB alloy in the direct current plasma stove, compare with existing boron magnesium ore deposit → boric acid → ferro-boron → FeSiB alloy prior, have simplified Production Flow Chart.The smelting recovery rate of B is more than 60%, and is suitable with the B recovery rate of thermite process, is higher than existing in the total B recovery rate of boron magnesium ore deposit to FeB far away.Raw material and reductive agent are cheap, can directly use the powder needn't agglomeration, and smelting operation is flexible, and start-stop is convenient, and AL needn't fall in alloy to be handled and promptly can be used as the iron-based non-crystalline mother alloy, and comprehensive cost is lower than current technology, and the very strong market competitiveness is arranged.
Embodiment 1
Raw material:
Boron magnesium ore deposit: oxidation fuses, t 〉=900 ℃ T=2～3h
Particle size after cracking≤6mm
Metal charge:
The pig iron: S≤0.1% P≤0.08%
Steel scrap: S≤0.05% P≤0.06%
Iron filings: S≤0.05% P≤0.06%
Reductive agent:
Metallurgical coke, gasification Jiao, refinery coke, hard coal all can,
Technical analysis: C
f G0〉=70% W
f＜1% particle size after cracking≤6mm
Ferrosilicon: Si=30%～80% particle size after cracking≤6mm
Auxiliary material:
Quickened lime: CaO 〉=85%
Fluorite: CaF
2〉=65%
Argon gas: purity 〉=99.99%
Furnace lining: with the carbon element stamp mass is working lining
Electrode: graphite matter, center-hole diameter 10～25mm
Smelting operation:
With breeze and reductive agent pre-mixing, its ratio is the ore deposit: carbon: ferrosilicon=1: 0.2～0.4: 0.1～0.4.It is standby that mixture adds furnace top bin.Add an amount of pig iron, steel scrap in the direct current electric arc furnace.The striking fusing is made high temperature iron and is bathed.When the metal pool temperature reached more than 1650 ℃, at first by electrode hole winding-up argon gas, argon flow amount was at 0.3～1.0Nm
3/ h.It is reinforced to arc region by centre hole of electrode with compound to start feeding device then.The strict coupling of feed rate and input electric power.Must guarantee to feed in raw material under electric arc, must not have the raw material that do not reach the fusing reaction to enter the slag phase, direct current plasma arc open arc is smelted.When slag reaches certain thickness, evenly add a small amount of iron filings to slag blanket, open the cinder notch slagging after 3-4 minute, during smelting, note keeping strong reducing property atmosphere in the stove by the top filling hole.The slagging operation is regularly carried out.By predetermined alloy ingredient allotment raw material, reductive agent and iron and steel stock are determined tap to tap time by feed rate.Reinforced finishing adds a small amount of quickened lime and fluorite in stove, open iron notch after the fusing, and slag iron mixes out, after solidifying, separates slag iron.The fragmentation of metal finished product, sampling, packing.
Embodiment 2
Raw material: the rich boron slag or the paigeite that directly reduces.Particle size after cracking≤6mm
All the other are with embodiment 1
Claims (2)
1, a kind of method of direct smelting iron-based amorphous master alloy is characterised in that raw material: boron magnesium ore deposit: oxidizing roasting, t 〉=900 ℃, granularity≤6mm; Rich boron slag: directly reduce paigeite, drying treatment, t 〉=120 ℃, granularity≤6mm; Reductive agent: coke powder or pulverized anthracite, C
f GD〉=70%, W
f＜1%, granularity≤6mm; Ferrosilicon powder: Si=30%～80%, granularity≤6mm; Iron and steel stock: the pig iron, steel scrap; Subsidiary material: lime, fluorite, argon gas; With any raw material, carbonaceous reducing agent and ferrosilicon are in 1: 0.2～0.4: 0.1～0.4 ratio pre-mixing, compound keeps dry, put into furnace top bin, the pig iron, steel scrap is packed in the direct current plasma stove of carbonaceous furnace lining, the striking melting waste steel also rises to the metal pool temperature more than 1650 ℃, compound all enters the arc region fusing by centre hole of electrode under argon gas carries, regular deslagging, before deslagging, in stove, evenly add a small amount of clean iron filings by the top filling hole,, finish the compound thermal reduction of carbon-silicon with the boron in the sedimentation slag, before smelting end, add a small amount of lime and fluorite in stove, after the slag fusing, slag iron mixes out, after the condensation, separate slag iron, the iron alloy fragmentation.
2, the method for direct smelting iron-based amorphous master alloy according to claim 1 is characterized in that carbonaceous reducing agent is metallurgical coke, gasification Jiao, refinery coke, hard coal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94110021 CN1105393A (en) | 1994-01-13 | 1994-01-13 | Method for directly smelting iron-base amorphous mother alloy from szaibelyite and boron-rich slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94110021 CN1105393A (en) | 1994-01-13 | 1994-01-13 | Method for directly smelting iron-base amorphous mother alloy from szaibelyite and boron-rich slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1105393A true CN1105393A (en) | 1995-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94110021 Pending CN1105393A (en) | 1994-01-13 | 1994-01-13 | Method for directly smelting iron-base amorphous mother alloy from szaibelyite and boron-rich slag |
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|---|---|
| CN (1) | CN1105393A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296504C (en) * | 2004-09-01 | 2007-01-24 | 东北大学 | Method for smelting boron steel directly from pig iron containing boron |
| US7704450B2 (en) | 2002-03-28 | 2010-04-27 | Nippon Steel Corporation | High-purity ferroboron, a mother alloy for iron-base amorphous alloy, an iron-base amorphous alloy, and methods for producing the same |
| CN101580903B (en) * | 2009-06-19 | 2010-12-08 | 钢铁研究总院 | Method for smelting iron-based amorphous master alloy |
| CN102637519A (en) * | 2012-05-14 | 2012-08-15 | 刘纪柱 | Method utilizing paigeite powder to manufacture magnet |
| CN103667855A (en) * | 2013-12-13 | 2014-03-26 | 青岛云路新能源科技有限公司 | Method for smelting iron-based amorphous master alloy with waste strips |
| CN109399720A (en) * | 2018-11-20 | 2019-03-01 | 四川省银河化学股份有限公司 | The waste liqouor of by-product brown iron oxide containing chromium utilizes method in sodium dichromate wet processing |
-
1994
- 1994-01-13 CN CN 94110021 patent/CN1105393A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7704450B2 (en) | 2002-03-28 | 2010-04-27 | Nippon Steel Corporation | High-purity ferroboron, a mother alloy for iron-base amorphous alloy, an iron-base amorphous alloy, and methods for producing the same |
| CN1296504C (en) * | 2004-09-01 | 2007-01-24 | 东北大学 | Method for smelting boron steel directly from pig iron containing boron |
| CN101580903B (en) * | 2009-06-19 | 2010-12-08 | 钢铁研究总院 | Method for smelting iron-based amorphous master alloy |
| CN102637519A (en) * | 2012-05-14 | 2012-08-15 | 刘纪柱 | Method utilizing paigeite powder to manufacture magnet |
| CN102637519B (en) * | 2012-05-14 | 2013-12-18 | 本溪钢铁(集团)建设有限责任公司 | Method utilizing paigeite powder to manufacture magnet |
| CN103667855A (en) * | 2013-12-13 | 2014-03-26 | 青岛云路新能源科技有限公司 | Method for smelting iron-based amorphous master alloy with waste strips |
| CN109399720A (en) * | 2018-11-20 | 2019-03-01 | 四川省银河化学股份有限公司 | The waste liqouor of by-product brown iron oxide containing chromium utilizes method in sodium dichromate wet processing |
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| WD01 | Invention patent application deemed withdrawn after publication |