CN101457269B - Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust - Google Patents

Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust Download PDF

Info

Publication number
CN101457269B
CN101457269B CN2008102370065A CN200810237006A CN101457269B CN 101457269 B CN101457269 B CN 101457269B CN 2008102370065 A CN2008102370065 A CN 2008102370065A CN 200810237006 A CN200810237006 A CN 200810237006A CN 101457269 B CN101457269 B CN 101457269B
Authority
CN
China
Prior art keywords
iron
microwave
dust
heating
sponge iron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2008102370065A
Other languages
Chinese (zh)
Other versions
CN101457269A (en
Inventor
李万绪
郝建学
唐萍
梁庆
帅林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Kejian Metallurgy Material Co., Ltd.
Original Assignee
Chongqing Gaoling Investment (Group) Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Gaoling Investment (Group) Co Ltd filed Critical Chongqing Gaoling Investment (Group) Co Ltd
Priority to CN2008102370065A priority Critical patent/CN101457269B/en
Publication of CN101457269A publication Critical patent/CN101457269A/en
Application granted granted Critical
Publication of CN101457269B publication Critical patent/CN101457269B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a process for directly producing sponge iron by microwave carbothermal reduction of ferrous metallurgical iron-containing dust. Anthracite coal is added to the ferrous metallurgical iron-containing dust, the weight of the ferrous metallurgical iron-containing dust accounts for 20-80% of the total weight, that of the anthracite coal accounts for 10-60%, and 1-20% of calcium lime is added to be taken as an additive; an obtained mixture is pressed into a 2mm-100mm ball after mixing and drying treatment, the heating temperature is between 800 DEG C to 1300 DEG C by adopting a microwave heating mode, the mixture reacts in a microwave reducing furnace to obtain a semi-finished raw sponge ball; and the ball is crushed and ground into fine powder less than 80 meshes, and finally a sponge iron product consistent with the requirement is obtained by a magnetic separation process. The process has the advantages of having selective heating characteristic, being capable of directly heating fine materials, having rapid temperature rise, having even heating, reducing energy consumption, lowering chemical reaction activation energy, and being capable of causing atoms and molecules of the materials to generate high-speed rotation. The process does not produce any pollution, which is beneficial to the environmental protection.

Description

Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust
Technical field
The present invention relates to a kind of carbothermic reduction ferrous iron containing metallurgical dust and produce the processing method of sponge iron, especially adopt microwave heating the ferrous iron containing metallurgical dust directly to be gone back the processing method of original production sponge iron.
Background technology
In the ferrous metallurgy production process, adding in the raw material in the stove has 2% to be transformed into dust.The generating capacity of converter dirt is about the 20kg/t steel, and the generating capacity of electric furnace dirt is about 10~20kg/t steel.American steel is already produced Dust Capacity per year near 1,800,000 tons according to estimates, and wherein 600,000 tons are produced by Electric furnace steel making, and 1,200,000 tons of remaining dust are all produced by the alkaline oxygen converter steelmaking method.
The ferrous metallurgy dust mainly is made up of ferric oxide, and the ferric oxide massfraction is 70~95%.Remaining 5~30% dust is made up of oxide impurity, and as calcium oxide and other metal oxides (mainly being zinc), other compounds are iron zinc ferrite, lime carbonate, iron magnesium ferrite and carbon in the ferrous metallurgy dust.The ferrous iron containing metallurgical dust mainly comprises: carbon containing, iron dust containings such as converter dust-removing powder, electric stove dust powder, blast furnace dedusting powder, coke oven dust.
Ferrous iron containing metallurgical dust disposal technology starts to walk later relatively at home, and present most of iron and steel enterprises adopt the mode of directly allocating the sintering system reuse into to handle.Direct reuse agglomerating mode has realized the recycling of dust resource to a certain extent, but all kinds of materials homogenize, whole grain (is removed the impurity element that the harm smelting iron and steel is produced with removal of impurities owing to lack, as zinc, lead, potassium, sodium etc.) process, make in these dust processes of reuse, to have the problem that influences ordinary production, also brought new environmental issue simultaneously.These problems concentrate on influences the sintering ventilation property, and the SINTERING PRODUCTION fluctuation is bigger, and then influences agglomerate quality product and ordinary production; Owing to lack impurity removed system, contain harmful elements such as potassium, sodium, zinc in these dust, directly influence sintering electric precipitation effect, cause the sintering electric precipitation can not be up to standard, influence environment protection.Harmful element zinc enters blast furnace with agglomerate, and at the blast furnace circulating enrichment, causes furnace nodulation, influences the blast furnace ordinary production.
Therefore, urgent need will be developed the ferrous metallurgy dust treatment technology that is fit to China's national situation, the element (zinc, basic metal etc.) of harm Iron and Steel Production is separated, as other industrial raw materials; To can be used for element (iron, carbon, the calcium etc.) recycle and reuse as far as possible of Iron and Steel Production, real " turning waste into wealth " and the resources effective utilization realized.In the hope of establishing demonstration for China's ferrous metallurgy powder dust resources utilization, walk out an Iron And Steel Industry recycling economy road that tallies with the national condition, advance the Sustainable development of China's Iron And Steel Industry.
At present, have document announcement to adopt the rotary hearth furnace process reduction to handle the ferrous metallurgy dust abroad, adopt the iron dust containing of this art breading, it is high that its dezincify rate does not have the microwave method reduction to handle, and degree of metalization is also lower.Dezincify rate is the highest has only 92% for it, and sponge iron resultant metal rate is less than 90%.Because it adopts external heating mode to reduce processing, cause secondary pollution serious in addition, energy consumption is big.And the production site floor space is big, the investment cost height.
Summary of the invention
The present invention is directed to prior art and fail thoroughly to solve the recycling problem of ferrous iron containing metallurgical dust, and adopt rotary hearth furnace process to produce sponge iron, ubiquity energy consumption height causes secondary pollution serious, and energy consumption is big.And the production site floor space is big, and the deficiency of aspects such as investment cost height provides a kind of employing process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust.
Technical scheme of the present invention: process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust, it is characterized in that: in carbon containing, ferruginous ferrous iron containing metallurgical dust, as converter dust-removing powder, blast furnace dedusting powder, coke oven dust powder, adding is as the hard coal of reductive agent, the ferrous iron containing metallurgical dust weight is than accounting for 20~80% of gross weight, the hard coal weight ratio accounts for 10~60% of gross weight, and accounts for 1~20% unslaked lime of gross weight as additive with addition of weight ratio; After stirring, drying treatment, make the pelletizing that diameter is 2mm~100mm, adopt microwave heating, Heating temperature is between 800 ℃~1300 ℃, obtain half-finished thick sponge iron pelletizing in the microwave reduction reaction in furnace, to endanger the element (zinc, basic metal etc.) of Iron and Steel Production simultaneously and separate, as other industrial raw materials.Thick sponge iron pelletizing becomes less than 80 purpose fine powders through broken, grinding again, passes through magnetic separation process at last, obtains satisfactory sponge iron product.
A kind of best proportioning is: the ferrous iron containing metallurgical dust weight accounts for 60~80% of gross weight, and hard coal weight accounts for 18~35% of gross weight, and lime weight accounts for 2~5% of gross weight; Through stirring, after the drying treatment, being pressed into the pelletizing that diameter is 10mm~40mm, adopt microwave heating, Heating temperature between 800 ℃-1100 ℃,
Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust of the present invention with respect to prior art, has following characteristics:
Microwave heating is different with traditional heating mode, and it does not need to conduct heat by modes such as conduction, convection current, but dissipates the direct heating material by microwave field at the inner dielectric medium that produces of material, belongs to the body type of heating of no thermograde.According to the dielectric properties (specific inductivity) of material, microwave can make pulverulent material produce heat quickly and evenly, and the type of heating that it is unique has the incomparable superiority of traditional heating, mainly shows:
1, have and select the gonosome heat characteristic, can the direct heating powder, heat up rapidly homogeneous heating.Reduce energy consumption, traditional rotary hearth furnace process unit sponge iron energy consumption: 800~1000KW.h/ ton.And the microwave heating unit consumption of energy is: 400~600K W.h/ ton.
2, adopt microwave internal heating principle, can reduce chemical reaction activation energy, the pelletizing reduction rate is fast, can significantly reduce reduction reaction time and temperature (can reduce about 200 ℃ than conventional rotary hearth furnace production), improves degree of metalization.Production efficiency is very high.
3, can promote heat absorption and thermopositive reaction simultaneously, and chemical reaction is had katalysis; Can make the atom and the molecule generation vibration at high speed of material, for chemical reaction is created more favourable thermodynamics and kinetics condition; Microwave heating saves time 40%~60% than the rotary hearth furnace heating.
4, microwave is a kind of clean energy, and itself does not produce any pollution, helps environment protection; Microwave heating is flexible, can realize automatization control.
5, the finished product sponge iron meets technical requirements: iron-holder is greater than 90%, degree of metalization>95%, C<0.3%, P<0.03%, S<0.03%.
6, microwave carbothermic reduction technology can reclaim useful element and recycle in Steel Production Flow Chart in carbon containing, the iron dust containings such as converter dust-removing powder, electric stove dust powder, blast furnace dedusting powder, coke oven dust, isolating and can not be used as the raw material that related industries is produced at the harmful element of Iron and Steel Production recycle, is the important content and the particular embodiment of development Iron And Steel Industry recycling economy.
Description of drawings
Accompanying drawing is that the sponge iron technical process is produced in microwave carbothermic reduction of the present invention
Embodiment
Microwave carbothermic reduction of the present invention of the present invention is as shown in the figure produced in the sponge iron technical process, its processing method is: with various ferrous iron containing metallurgical dust, as the converter dust-removing powder, the electric stove dust ash, the blast furnace dedusting powder, coke oven dust powder etc., according to its ferric oxide and carbon content, in proportion with addition of hard coal as reductive agent, ferrous iron containing metallurgical dust weight proportioning accounts for 20~80% of gross weight, the hard coal weight proportion is to account for 10~60% of gross weight, and with addition of 1~20% unslaked lime as additive, after drying is handled, make the pelletizing that diameter is 2mm~100mm, put into the microwave reduction stove and reduce, reduction temperature is controlled between 800 ℃~1300 ℃.Obtain thick sponge iron pelletizing, i.e. work in-process in the microwave reduction reaction in furnace.To endanger the element (zinc, basic metal etc.) of Iron and Steel Production simultaneously and separate, as other industrial raw materials.Pelletizing becomes less than 80 purpose fine powders through broken, grinding again, passes through magnetic separation process at last, obtains satisfactory sponge iron product.Drying treatment, make pelletizing, fragmentation, grinding etc. and all adopt prior art, be not further described at this.The microwave reduction stove that the present invention relates to is: the reduction furnace that tunnel like, employing microwave such as vertical heat.Concrete Heating temperature can be chosen 850 ℃, 900 ℃, 950 ℃, 1000 ℃, 1050 ℃, 1100 ℃, 1150 ℃, 1200 ℃, 1250 ℃, 1300 ℃ etc.The technological process of production is seen Fig. 1.
A kind of best proportioning is: the ferrous iron containing metallurgical dust weight accounts for 60~80% of gross weight, and hard coal weight accounts for 18~35% of gross weight, and lime weight accounts for 2~5% of gross weight; Through stirring, after the drying treatment, being pressed into the pelletizing that diameter is 10mm~40mm, adopt microwave heating, Heating temperature between 800 ℃-1100 ℃,
The index of correlation of processing requirement of the present invention is as follows:
1, the ferrous iron containing metallurgical dust requires: full iron (TFe) content 〉=40%, and the hard coal technical requirements: ash content≤15%, volatile matter≤20%, sulphur content is not more than 1%.
2, ferrous metallurgy dust proportioning is 20~80%, and the hard coal proportioning is 10~60%, unslaked lime 1~20%.
3, finished product sponge iron technical indicator: iron level is greater than 90%, degree of metalization>95%, C<0.3%, P<0.03%, S<0.03%.

Claims (2)

1. process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust, it is characterized in that: in carbon containing, ferruginous ferrous iron containing metallurgical dust, adding is as the hard coal of reductive agent, described ferrous iron containing metallurgical dust weight accounts for 20~60% of gross weight, hard coal weight accounts for 35~60% of gross weight, and accounts for 1~20% unslaked lime of gross weight as additive with addition of weight; After stirring, drying treatment, be pressed into the pelletizing that diameter is 10mm~40mm, adopt microwave heating, Heating temperature obtains half-finished thick sponge iron pelletizing in the microwave reduction reaction in furnace between 800 ℃~1000 ℃; Thick sponge iron pelletizing becomes less than 80 purpose fine powders through broken, grinding, passes through magnetic separation process at last, obtains the sponge iron product;
Described ferrous iron containing metallurgical dust technical indicator: all iron content 〉=40%;
Described hard coal technical indicator: ash content≤15%, volatile matter≤20%, sulphur content is not more than 1%;
Described sponge iron technical target of the product: iron level is greater than 90%, degree of metalization>95%, C<0.3%, P<0.03%, S<0.03%.
2. process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust according to claim 1 is characterized in that: described microwave reduction stove is the reduction furnace that tunnel like, vertical employing microwave heat.
CN2008102370065A 2008-12-30 2008-12-30 Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust Expired - Fee Related CN101457269B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008102370065A CN101457269B (en) 2008-12-30 2008-12-30 Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2008102370065A CN101457269B (en) 2008-12-30 2008-12-30 Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust

Publications (2)

Publication Number Publication Date
CN101457269A CN101457269A (en) 2009-06-17
CN101457269B true CN101457269B (en) 2010-10-13

Family

ID=40768389

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2008102370065A Expired - Fee Related CN101457269B (en) 2008-12-30 2008-12-30 Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust

Country Status (1)

Country Link
CN (1) CN101457269B (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101914685B (en) * 2010-08-19 2012-01-25 北京科技大学 Method for preparing metal iron and zinc/zinc oxide from electric furnace dust
CN102534264A (en) * 2012-02-24 2012-07-04 湖南阳东微波科技有限公司 Technique for producing and reducing ilmenite in industrial microwave kiln
CN102766718B (en) * 2012-07-24 2013-11-27 新冶高科技集团有限公司 Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash
CN102978320A (en) * 2012-11-23 2013-03-20 武钢集团昆明钢铁股份有限公司 Method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in microwave heating manner
CN103131815B (en) * 2013-03-19 2014-10-01 李学文 Technique for producing spongy iron and nickel iron by microwave high-temperature continuous reduction
CN103205519B (en) * 2013-04-25 2014-12-03 石家庄市宏晟环保科技有限公司 Technology for extracting iron from steel-making and ironmaking fly ash by micro-wave heating
CN103290159B (en) * 2013-06-06 2015-09-09 昆明钢铁集团有限责任公司 The method of direct-reduction iron powder is produced in a kind of microwave heating
CN104745757B (en) * 2013-12-27 2017-06-16 中冶长天国际工程有限责任公司 A kind of microwave fuel combined heat formula coal-based direct reduction method and rotary hearth furnace
CN104028358B (en) * 2014-06-16 2016-02-17 中国矿业大学 A kind of Bed for Fine Coal microwave-medium strengthening magnetic separation clean system and technique
CN107779536B (en) * 2016-08-31 2020-03-17 中冶长天国际工程有限责任公司 Method and device for producing direct reduced iron
CN107034356A (en) * 2017-05-09 2017-08-11 江苏省冶金设计院有限公司 A kind of method of microwave tunnel kiln reduction apparatus and its smart iron ore of reduction
CN109022808A (en) * 2018-08-24 2018-12-18 贵州省冶金化工研究所 A kind of comprehensive recovering process of the dust of Ferrous Metallurgy containing zinc
WO2020107670A1 (en) * 2018-11-26 2020-06-04 贵州大学 Method for concentrating iron by comprehensively utilizing steelmaking dust
CN110004291B (en) * 2019-04-23 2020-07-24 中南大学 Method for efficiently treating ferrous metallurgy dust and co-producing direct reduced iron powder
CN113293251A (en) * 2021-06-02 2021-08-24 昆明理工大学 High-added-value recycling method for microwave-reinforced steel slag grain steel

Also Published As

Publication number Publication date
CN101457269A (en) 2009-06-17

Similar Documents

Publication Publication Date Title
CN101457269B (en) Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust
CN101270410A (en) Cold bonded pellet and method of producing the same
CN103114201B (en) Agglomeration method for iron containing dust slime of iron and steel plants
CN102559976B (en) A kind of with the method for low-grade high-phosphorus iron ore for waste direct-reduced iron
CN102766718B (en) Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash
CN106591575B (en) Low energy consumption coal-pressing ball and preparation method thereof
CN102796879B (en) Method for preparing chromium-containing iron powder by direct reduction of calcium-free chromium slag
CN102534199A (en) Comprehensive utilization process of zinc-containing iron dust
CN103146913B (en) Method for treating iron-containing dust of iron and steel plant by using cupola furnace
CN101144110A (en) Method for directly producing ferrochromium from chrome ore powder and coal
CN105695735A (en) Self-reduction utilization process for steel rolling oily sludge and blast furnace gas dust
CN106480310A (en) A kind of alkali-metal method in removing metallurgical dust sludge
CN101654737B (en) Compound iron ore pellet of molybdenum tailings and sulfate slags and preparation method thereof
CN1936041A (en) Steelsmelting dust-mud pelletizing slag-melting agent compounding method
CN101109027A (en) Method for producing ball iron with iron scale
CN103160302B (en) Processing method of metallurgical dust mud containing iron carbon zinc
CN102719575B (en) Converter slag modifier and manufacture and using method thereof
CN103602773B (en) Method for comprehensive utilization of paigeite through direct reduction-electric furnace melting separation of rotary hearth furnace
CN102653822B (en) Iron-containing solid byproduct of iron making by smelting reduction and manufacturing method thereof
CN102925675B (en) Method for recovering sludge from smelting ironmaking
CN105331808A (en) Method for iron ore powder agglomeration
CN103952540B (en) Ion dust mud contaning and high silicon iron concentrate is utilized to produce the technique of prereduced burden
CN102851512B (en) Method for producing iron alloy through vanadium extraction tailing reduction smelting
JP5139961B2 (en) Method for producing ferromolybdenum
CN102732670A (en) Recycling method for treating iron-bearing dust by utilizing carbonation process

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 400080 DADUKOU, CHONGQING TO: 401258 CHANGSHOU, CHONGQING

ASS Succession or assignment of patent right

Owner name: CHONGQING KEJIAN METALLURGY MATERIAL CO., LTD.

Free format text: FORMER OWNER: CHONGQING GAOLING INVESTMENT (GROUP) CO., LTD.

Effective date: 20140724

TR01 Transfer of patent right

Effective date of registration: 20140724

Address after: 401258, Changshou District, Chongqing City Jiangnan District Street, steel auxiliary road three, No. 2

Patentee after: Chongqing Kejian Metallurgy Material Co., Ltd.

Address before: Eight town 400080 Dadukou District of Chongqing

Patentee before: Chongqing Gaoling Investment (Group) Co., Ltd.

C41 Transfer of patent application or patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20101013

Termination date: 20161230