CN101157961A - Preparation method for producing low-grade ferroniobium by using ferroniobium concentrate - Google Patents
Preparation method for producing low-grade ferroniobium by using ferroniobium concentrate Download PDFInfo
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- CN101157961A CN101157961A CNA2007101579647A CN200710157964A CN101157961A CN 101157961 A CN101157961 A CN 101157961A CN A2007101579647 A CNA2007101579647 A CN A2007101579647A CN 200710157964 A CN200710157964 A CN 200710157964A CN 101157961 A CN101157961 A CN 101157961A
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Abstract
The invention relates to the technical field of smelting ferroalloy, in particular to a production method of low-grade ferrocolumbium by using ferrocolumbium ore concentrate. The method is that ferrocolumbium ore concentrate is taken as primary raw material, which is characterized in that the power of ferrocolumbium ore concentrate, the coal power and a little of bond are blended, heated and pressed into block; after being preheated and selective solid-state deoxidated in high-temperature furnace, the block is loaded into an electric furnace and mixed with the molten iron to get rich niobium-bearing slag and phosphorous semi-steel, the rich niobium-bearing slag, mild-phosphor molten iron, reducer and agent of fusion are put into the electric furnace, and the rich niobium-bearing slag is deeply deoxidated to produce the low-grade ferrocolumbium alloy with high ration of Nb to phosphor. The invention has the advantages of saving energy, shortening the time of process flow and improving the recovery rate of Nb.
Description
Technical field
This invention is the ferroalloy smelting technical field, is specially a kind of preparation method that utilizes the ferro-niobium concentrate to produce rudimentary ferro-niobium.
Background technology
Metal Nb has higher melt (Tm=2468 ℃), lower electron work functon, good anti-corrosion and plasticity-, as strategic resource also is scarce resource simultaneously, be widely used in metallurgy, chemical industry, machinery, electronics, aviation, fields such as atom, in field of metallurgy, after containing small amount of N b element in the steel, can significantly improve the yield strength of steel, impelling strength, processing characteristics, welding property, corrosion resisting property etc., the Nb oxide compound is as the electronic industry raw material in addition, thermo-sensitive materials etc. are the attention and the favor of each relevant industries extremely both at home and abroad also, therefore needs active development and utilization.
Traditional ferro-niobium smelting technology, be raw material how with the ferro-niobium concentrate, adopt " blast furnace reduce-bessemerize rich niobium slag-electrosmelting ferrocolumbium " or " the molten deferrization dephosphorization-electrosmelting ferrocolumbium that divides of cold bound pellet-rotary kiln solid state reduction-electric furnace " to wait operational path production niobium manganeseirom, and then further be used, therefore producing ferrocolumbium is the first step or perhaps the prerequisite of rationally utilizing metal niobium.But, these sophisticated niobium smelting technologyes were all not ideal enough in the past, for example, there are shortcomings such as complex process, long flow path, equipment manufacturing cost height in traditional blast furnace-converter-electrosmelting niobium ferromanganese operational path, the more important thing is that the niobium oxides NbO in the mineral can not all be reduced, therefore scarce resource is not fully utilized, and the construction of this and conservation-minded society is disagreed, and whole flow process energy consumption is higher.And the molten deferrization dephosphorization-electric furnace that divides of cold bound pellet-rotary kiln selective reduction-electric furnace reduces the problem that rich niobium slag melting niobium ferromanganese technology also exists some to occur easily in producing deeply, at first be to add a large amount of binding agents at home and abroad in raw material agglomeration process, quantity of slag showed increased when therefore causing rising of cold bound pellet cost and smelting; Next be cold bound pellet in the rotary kiln reduction process, expend time in long and hot conditions under binding agent very easily lost efficacy, made cold bound pellet hot strength variation, cause in the rotary kiln production phenomenons such as inherent accident such as efflorescence, the inner ring formation of rotary kiln often to occur, reduce equipment operation rate, influenced labour productivity; Molten the branchs process of the 3rd electric furnace reduction is a raw material with the solid metal pellet separately, and the formation speed that make electrode starting the arc difficulty, causes the molten bath because of its conductive effect difference slowly, power consumption is high, the niobium resource recovery is low; Also have and when last electric furnace reduces rich niobium slag deeply, to have shortcomings such as smelting temperature is higher, smelting cycle is long.
Summary of the invention
In order to solve above-mentioned deficiency, the researchist has proposed the production technique imagination that " the molten deferrization dephosphorization-electric furnace hot metal charging low temperature that divides of niobium concentrate and coal dust Hybrid Heating high pressure agglomeration-High-temp. kiln selective reduction-electric furnace hot metal charging reduces deeply " smelts rudimentary ferrocolumbium, purpose is effectively to save by the enforcement of novel process the resource of metal niobium, reduce energy consumption, promote the technical progress of existing ferrocolumbium production technique with this, for corresponding contribution is made in national economic development.
According to above-mentioned invention imagination and purpose, this invention can be implemented step by step by following 4 technologies.
1) hot pressing agglomeration.Behind ferro-niobium concentrate, coal dust and a spot of binding agent mixing, heat, add and be pressed into carbon containing ferro-niobium concentrate particle with certain size;
2) selective reduction.Ready-formed carbon containing ferro-niobium concentrate particle at High Temperature Furnaces Heating Apparatus inner drying, preheating, solid state reduction, is made the reduced iron particle;
3) electric furnace is molten divides.With the reduced iron particle pack into electric furnace, be blended into an amount of molten iron, purpose is to make electric furnace the is molten easy starting the arc work of electrode when dividing operation, save energy also shortens molten the branch cycle, the slag iron of fusing is finished separating of phosphorous half steel and rich niobium slag under arcing;
4) low temperature smelting.Rich niobium slag is encased in the electric furnace, is blended into molten iron, reductive agent and flux simultaneously, the rudimentary ferrocolumbium of the direct production of reducing deeply, the basicity of control slag, high basicity slag is easy to make the product of high niobium phosphorus than (Nb/P 〉=15).
Realize above-mentioned flow process,, can obtain more positive effect if in concrete operations, control following processing parameter:
1) hot pressing agglomeration.In agglomeration process, adopt hot wafering explained hereafter carbon containing hot wafering, mixed carbon comtent is the theoretical value of reducing iron oxides, with niobium fine ore, coal dust, small amount of binder mixing post-heating temperature to 400 ℃, make small-sized briquetting under 200MPa pressing force condition, briquetting size 20 * 20 * 10mm.Coal dust is the above bituminous coal of thickness of colloidal matter layer 10mm.
2) selective reduction.Adopt rotary hearth furnace or High-temp. kiln technology to carry out selective reduction, 1100～1250 ℃ in reduction temperature interval.Recovery time 30min.
3) electric furnace is molten divides.The molten timesharing of electric furnace is blended into molten iron, adds a small amount of reductive agent and solvent, and molten iron is 1: 1 with reduction briquetting mass ratio, utilizes the molten iron sensible heat to cut down the consumption of energy, help simultaneously the electrode starting the arc, reduces power consumption, improves electric furnace production efficiency; Control basicity of slag 0.8, MgO content 15% in the slag helps making phosphorus to enter the half steel molten iron, reduces the phosphorus content of rich niobium slag.
4) low temperature smelting.Reductive agent is that carbon, usage quantity are 2 times of Nb oxide compound theory of reduction value; Convert low-phosphorous molten iron by 4 times of Nb content; Basicity of slag (%CaO/%SiO
2) 1.1 ± 0.1; 1550 ℃ of smelting temperatures; About 2 hours of tap to tap time, produce Nb content and be about 15% rudimentary ferrocolumbium.In order in dark reduction process, not generate Nb
2Materials such as C, controlled atmosphere condition P
CO2/ P
CO〉=0.001,
The invention effect
According to the principle of the invention, can obtain following effect:
1) join carbon in the employing and add the hot wafering mode, the addition that can reduce binding agent also can improve the cold strength and the hot strength of briquetting significantly, improves the dynamic conditions of solid state reduction, enhances productivity.
2) because the reduction temperature in the control High-temp. kiln only allows iron, phosphorus reduction, kept the original oxide compound occurrence patterns of Nb.
3) help electric furnace electrode starting the arc work owing to be blended into molten iron in the molten branch process of electric furnace slag iron, and, easily obtain low-phosphorous rich niobium slag, help producing when next step is smelted the ferrocolumbium of high Nb/P ratio owing to controlled the basicity of slag.Requiring the MgO content in the slag is in order to improve the flowability of low basicity slag.
4) electrosmelting process utilizes the 12%Nb-Fe alloy to have the characteristic of lower eutectic temperature (1380 ℃ of 12%Nb-Fe alloy melting points), directly is blended into molten iron, and a step obtains rudimentary ferrocolumbium,
In a word, compare with the smelting technology of in the past ferrocolumbium, this technology is comparatively simple, helps low temperature smelting, reduces energy consumption, and can improve the recovery rate of metal niobium, has effectively utilized scarce resource.
Embodiment
This method of producing rudimentary ferrocolumbium is in the secret enforcement of certain factory.Concrete mode is as follows:
1) hot pressing agglomeration.The niobium fine ore of selecting contains niobium 2.14%; The coal dust that uses is bituminous coal, ash content 7.5%, fugitive constituent 34.3%, thickness of colloidal matter layer 12mm; Binding agent is bentonite, add-on 0.5%; With the niobium fine ore, press coal dust, bentonite that the reducing iron oxides stoichiometry is calculated, mixing post-heating to 400 ℃, under 200MPa pressing force condition, make the flat briquetting, briquetting size 20 * 20 * 10mm.
2) selective reduction.Adopt High-temp. kiln to carry out selective reduction, 1150 ℃ of reduction temperatures, recovery time 30min.
3) electric furnace is molten divides.Be blended into molten iron and add a small amount of coke powder, molten iron is 1: 1 with reduction briquetting mass ratio, and the interpolation rhombspar is adjusted basicity of slag and reached 0.8, MgO content 15% in the slag.
4) low temperature smelting.Add coke powder, usage quantity is 2 times of Nb oxide compound theory of reduction value, presses 4 times of hot metal chargings of Nb content simultaneously, adjusts basicity of slag (%CaO/%SiO
2) 1.1 ± 0.1,1550 ℃ of control smelting temperatures.125 minutes tap to tap time.
Produce according to above-mentioned technology, the Nb content 14.7% of its product belongs to rudimentary ferrocolumbium.
Claims (1)
1. one kind is raw material, is the preparation method that main equipment is produced rudimentary ferrocolumbium with the metallurgical furnace kiln with the ferro-niobium concentrate, it is characterized in that whole smelting production process is by hot pressing agglomeration, selective reduction, the molten branch of electric furnace and low temperature smelting 4 big operations, wherein the hot pressing agglomeration is that heating and pressurizing is made the particle with certain size with behind ferro-niobium concentrate, coal dust and a spot of binding agent mixing; Selective reduction is that ready-formed carbon containing ferro-niobium concentrate particle is become the iron particle at High Temperature Furnaces Heating Apparatus inner drying, preheating, solid state reduction; Electric furnace is molten divide be with the reduced iron particle pack into electric furnace, be blended into molten iron, separate with rich niobium slag at following phosphorous half steel of arcing; Low temperature smelting is the carbonaceous reducing agent that adds in rich niobium slag by 2 times of Nb oxide compound theory of reduction values, and convert low-phosphorous molten iron by 4 times of Nb content, the control basicity of slag is 1.1 ± 0.1,1550 ℃ of smelting temperatures, produces Nb content and is about 15% rudimentary ferrocolumbium product.
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| CNA2007101579647A CN101157961A (en) | 2007-11-06 | 2007-11-06 | Preparation method for producing low-grade ferroniobium by using ferroniobium concentrate |
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| CNA2007101579647A CN101157961A (en) | 2007-11-06 | 2007-11-06 | Preparation method for producing low-grade ferroniobium by using ferroniobium concentrate |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526027A (en) * | 2013-09-27 | 2014-01-22 | 包头稀土研究院 | Method for preparing niobium, titanium and iron alloy by using carbon reduction and niobium, titanium and iron alloy |
| CN103993162A (en) * | 2014-05-21 | 2014-08-20 | 包头稀土研究院 | Method for removing iron and phosphorus of high phosphorus ferroniobium concentrate |
| CN104762441A (en) * | 2015-04-07 | 2015-07-08 | 内蒙古科技大学 | Niobium-containing slag dephosphorization method |
| CN105256129A (en) * | 2015-11-18 | 2016-01-20 | 金川集团股份有限公司 | Method for enriching noble metal through direct reduction-melting of Nelson concentrate |
| CN105907990A (en) * | 2016-05-26 | 2016-08-31 | 江苏省冶金设计院有限公司 | Method of producing ferrocolumbium |
| CN106987673A (en) * | 2017-03-31 | 2017-07-28 | 北京科技大学 | A kind of method that selecting smelting combination is enriched with niobium from titaniferous ferro-niobium concentrate |
| CN108411127A (en) * | 2018-04-04 | 2018-08-17 | 包头钢铁（集团）有限责任公司 | The restoring method of niobium concentrate miberal powder |
| CN108441638A (en) * | 2018-03-29 | 2018-08-24 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of the molten of vanadium slag useless absolutely divides processing method, vanadium slag and vanadic anhydride |
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2007
- 2007-11-06 CN CNA2007101579647A patent/CN101157961A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526027B (en) * | 2013-09-27 | 2016-02-03 | 包头稀土研究院 | Method and the niobium ferro-titanium of niobium ferro-titanium are prepared in profit reduction with carbon |
| CN103526027A (en) * | 2013-09-27 | 2014-01-22 | 包头稀土研究院 | Method for preparing niobium, titanium and iron alloy by using carbon reduction and niobium, titanium and iron alloy |
| CN103993162A (en) * | 2014-05-21 | 2014-08-20 | 包头稀土研究院 | Method for removing iron and phosphorus of high phosphorus ferroniobium concentrate |
| CN103993162B (en) * | 2014-05-21 | 2016-04-13 | 包头稀土研究院 | A kind of method of high phosphorus ferro-niobium concentrate deferrization dephosphorization |
| CN104762441B (en) * | 2015-04-07 | 2017-01-18 | 内蒙古科技大学 | Niobium-containing slag dephosphorization method |
| CN104762441A (en) * | 2015-04-07 | 2015-07-08 | 内蒙古科技大学 | Niobium-containing slag dephosphorization method |
| CN105256129A (en) * | 2015-11-18 | 2016-01-20 | 金川集团股份有限公司 | Method for enriching noble metal through direct reduction-melting of Nelson concentrate |
| CN105907990A (en) * | 2016-05-26 | 2016-08-31 | 江苏省冶金设计院有限公司 | Method of producing ferrocolumbium |
| CN105907990B (en) * | 2016-05-26 | 2018-03-23 | 江苏省冶金设计院有限公司 | A kind of method for producing ferro-niobium |
| CN106987673A (en) * | 2017-03-31 | 2017-07-28 | 北京科技大学 | A kind of method that selecting smelting combination is enriched with niobium from titaniferous ferro-niobium concentrate |
| CN106987673B (en) * | 2017-03-31 | 2018-11-27 | 北京科技大学 | A kind of method that selecting smelting combination is enriched with niobium from titaniferous ferro-niobium concentrate |
| CN108441638A (en) * | 2018-03-29 | 2018-08-24 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of the molten of vanadium slag useless absolutely divides processing method, vanadium slag and vanadic anhydride |
| CN108411127A (en) * | 2018-04-04 | 2018-08-17 | 包头钢铁（集团）有限责任公司 | The restoring method of niobium concentrate miberal powder |
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