CN103667687B - The method that the anti-pelletizing high temperature reduction of process high-phosphor oolitic hematite shaft furnace coheres - Google Patents
The method that the anti-pelletizing high temperature reduction of process high-phosphor oolitic hematite shaft furnace coheres Download PDFInfo
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Abstract
Process the method that the anti-pelletizing high temperature reduction of high-phosphor oolitic hematite shaft furnace coheres, belong to direct reduction processes of Iron ores field.High-phosphor oolitic hematite powder and coal dust, dephosphorizing agent and caking agent are carried out preparing burden in suitable ratio, mixed grind, pressure ball, make cold bound pellet, this agglomerated pellet, through drying or health process, enters direct-reduction shaft furnace; Pelletizing is in direct-reduction shaft furnace, from top to down is experienced heating gas roasting and the prereduction of gas base, coal-based direct reduction and process of cooling, the gas base prereduction of agglomerated pellet experience, coal-based direct reduction temperature range 850-1200 DEG C, the residence time in shaft furnace is 1-5h; Reducing gas forms: be H
2/ CO=1.2-4, the pelletizing sealing cooling after reduction, in cooling section exit, agglomerated pellet temperature controls at 100 ~ 200 DEG C, then by agglomerated pellet fragmentation, magnetic separation and briquetting, TFe>=88% in the iron product obtained, phosphorus content & lt; 0.3%.Advantage is, reduces the energy consumption of reduction shaft furnace process.
Description
Technical field
The invention belongs to direct reduction processes of Iron ores field, relate to a kind of method processing the anti-pelletizing high temperature reduction of high-phosphor oolitic hematite shaft furnace and cohere, namely utilize the technique of gas base+coal-based shaft furnace process oolitic hematite.
Background technology
For domestic a large amount of existence, be difficult to again the roe shape high-phosphorus hematite resource that utilizes, domesticly attempt to solve gordian technique bottleneck always, get through technical process, accomplish scale production, make domestic iron and steel enterprises break away from dependency to external high price iron ore deposit gradually.But from existing achievement in research, the utilisation technology Recent Progresses In The Development in this direction is slower.Though carried out a large amount of research work in the optimization of roe shape high-phosphorus hematite technique of preparing in the past, particularly ore dressing aspect, as Central South University's (patent: a kind of method being prepared ironmaking iron ore concentrate by phosphorous oolitic hematite, application number: CN200710034838.2), Guizhou University's (patent: a kind of beneficiation method of oolitic hematite, application number: CN200910309207.6).But due to the mineral phase structure that the densification that roe shape high-phosphorus hematite is special is nested, the ore deposit such as ferric oxide and phosphatic rock Entropy density deviation size is at 10 μm, cause the metallic iron in these mineral and impurity element phosphorus to be difficult to effectively be separated, still can not meet the restriction requirement of existing Steel Production Flow Chart to phosphorus content in finished product ore deposit.And coal-based direct reduction method (as rotary hearth furnace, rotary kiln etc.) relatively ripe at present, no matter in industrial scale, production stability and technico-economical comparison, or this special mineral structure of process roe shape high-phosphorus hematite, does not all also have successful story.A large amount of Basic Experiment Study relevant to coal-based direct reduction at present, a lot of achievement is only limitted to for concrete technology link and carries out, and also has certain distance apart from real through engineering approaches.
For the recycling of this special mineral of roe shape high-phosphorus hematite, reach the source of iron requirement at present needed for steel-making, must select favourable technological approaches, efficient solution is carried iron, is fallen the technical bottleneck problem of phosphorus.The present invention attempts reaching by gas base+coal-based shaft furnace compound direct reduction process that combines the object carried iron, fall phosphorus, the ferric oxide contained by these mineral is made efficiently to be reduced into the metallic iron with certain magnetic, simultaneously, make the impurity substances such as the phosphorus oxide contained by it be deposited in as far as possible nonmagnetic gangue mutually in, reduzate, again through the crushing-magnetic selection of less expensive, realizes effectively being separated of iron and phosphorus.
The maximum difficult point restricting gas base+coal-based shaft furnace through engineering approaches that this technique proposes how to solve the burden direct motion of nodulizing in high temperature (850 DEG C-1200 DEG C) reduction process and loading softening phenomenon and adhesion problems.Current correlative study is less, particularly for the research preventing nodulizing high temperature reduction from boning of the shaft furnace of coal-based+gas base.Patent utilization of the present invention has the shaft furnace device process roe shape high-phosphorus hematite resource of large-scale production potentiality, solves the pelletizing high temperature reduction adhesion problems that coal-based shaft furnace exists, thus obtains direct-reduction product that is low-phosphorous, high Fe content.
Summary of the invention
The object of the present invention is to provide and a kind ofly process the method and device that the anti-pelletizing high temperature reduction of high-phosphor oolitic hematite shaft furnace coheres; solve the problem that pelletizing high temperature reduction coheres; this processing technology routine is once get through; be expected to the effective means becoming steel industry the most potential mass-producing process roe shape high-phosphorus hematite resource; for steel industry provides new source of iron; both as the substitute of the steel scrap used a large amount of in bof process, the main source of steel scrap in electric furnace short route can be become again.Therefore, getting through of this processing technology routine is apparent to the pushing effect of steel industry technical progress.
Operational path of the present invention adopts the gas base+coal-based compound combined direct reduction shaft furnace process high-phosphor oolitic hematite, produces direct-reduction iron product.High-phosphor oolitic hematite powder and coal dust, dephosphorizing agent and caking agent are carried out preparing burden in suitable ratio, mixed grind, pressure ball, make cold bound pellet, this agglomerated pellet, through drying or health process, enters direct-reduction shaft furnace; Pelletizing is in direct-reduction shaft furnace, from top to down is experienced heating gas roasting and the prereduction of gas base, coal-based direct reduction and process of cooling, the gas base prereduction of agglomerated pellet experience, coal-based direct reduction temperature range 850-1200 DEG C, the residence time in shaft furnace is 1-5h; Reducing gas forms: be H
2/ CO=1.2-4, (CO+H
2>90%, N
2<10%), the pelletizing sealing cooling after reduction, in cooling section exit, agglomerated pellet temperature controls at 100 ~ 200 DEG C, again by agglomerated pellet fragmentation, magnetic separation and briquetting, TFe>=88% in the iron product obtained, phosphorus content <0.3%.
Described agglomerated pellet ultimate compression strength >1500N;
Described reduction shaft furnace adopts the shaft furnace structure of syllogic: shaft furnace is followed successively by pellet roasting and gas base prereduction section, coal-based direct reduction section and cooling section from top to bottom, and the space of shaft furnace and short transverse can guarantee that the blanking velocity of pelletizing controls within the scope of 2-8m/h;
In roasting and gas base prereduction section, perpendicular in-furnace temperature controls 850 ~ 950 DEG C of scopes; In coal-based direct reduction section, perpendicular in-furnace temperature controls 950 ~ 1200 DEG C of scopes.
Described oolitic hematite weight percentage TFe:>40%, SiO
2: 4-15%, Al
2o
3: >5%, P:0.4-1.0%.
Described cold bound pellet dual alkalinity is 0.7-1.3; Oolitic hematite weight percentage is 65-85%; Coal blending: 5-20%; Binding agent: 3-7%.
The material of the raising pellet strength added in described agglomerated pellet is siliceous binding agent, prevent from agglomerated pellet surface high-temp from reducing cohering institute with addition of material for being oxidized calcareous, aluminum oxide or magnesia material.
Shaft furnace tail gas is carried out to the process of dedusting and carbon dioxide removal, the shaft furnace tail gas after process heats up through heated by gas device, then enters shaft furnace coal gas air port place, forms the closed-loop control that shaft furnace circulation of tail gas utilizes, and reduces the energy consumption of reduction shaft furnace process.
In order to realize aforesaid method, shaft furnace of the present invention has following features:
(1) in order to ensure the effective reduction of pelletizing in shaft furnace and prevent gluing, by controlling air port place gas flow and the temperature of blanking velocity and different heights in shaft furnace, guarantee that top pellet roasting and gas base prereduction section, middle part pelletizing coal-based direct reduction section and bottom pelletizing cooling section are in the temperature controlling range of expection all the time.
(2) whole shaft furnace at least designs three row's coal gas air ports on different heights position, and the gas flow that every exhaust outlet place blasts and temperature can need to control according to technique;
(3) heating gas blasting shaft furnace need be heated to temperature required through heated by gas device, then enters shaft furnace; For the coal gas guaranteeing to enter shaft furnace makes different positions in corresponding shaft furnace obtain relatively uniform temperature field, coal gas air port design can be become can enter the central position of shaft furnace radial direction;
(4) by controlling the discharging speed of shaft furnace, the blanking velocity of furnace charge in shaft furnace being controlled the scope at 2 ~ 8m/h, alleviating the problem of the bonding of furnace charge under high temperature reduction;
(5) pair roller type or disc type drawing mechanism is adopted.
In shaft furnace, produce high temperature reduction to prevent stove pelletizing to cohere, the method for employing is:
(1) in pelletizing, add the intensity (ultimate compression strength >1500N) that binding agent improves pelletizing;
(2) structure design preventing pelletizing from cohering in shaft furnace: adopt shaft furnace to comprise pellet roasting and gas base prereduction section, high-temperature coal base directly reducing section and cooling section; By controlling discharging speed, controlling the blanking velocity of pelletizing in shaft furnace is 2-8m/h; By the control to different air port place's gas flow and temperature, strict control pellet roasting and gas base prereduction section and high-temperature coal base directly reducing section temperature, roasting and gas base prereduction section temperature are 850 ~ 950 DEG C, and high-temperature coal base directly reducing section temperature is 950 ~ 1200 DEG C.
(3) surperficial with addition of a certain amount of anti-cakingagent at pelletizing.
The present invention's tool of the present invention compared with additive method has the following advantages:
(1) in attempted gas base+coal-based composite reduction process, the highest reduction temperature can reach 1200 DEG C, is conducive to the efficient reduction of iron-bearing mineral; And current shaft furnace gas base is at 850-900 DEG C.By improving stove pellet strength, to adopt in unique shaft furnace structure design and pelletizing with addition of the method for tack reducing material to solve the adhesion problems of pelletizing high temperature reduction.
(2) consider the selective reduction of oolitic hematite institute's containing metal iron and impurity element phosphorus in reduction process and carry iron, fall phosphorus problem, the present invention utilizes the reduction added the alkaline matter such as lime and suppress phosphorus, causes ferric oxide in ore to have precedence over phosphorus oxide and is reduced into the metallic iron with certain magnetic and the iron crystalline phase microscopic dimensions requirement being conducive to magnetic separation and being separated.
(3) producer gas generator is utilized to produce reduction shaft furnace coal gas used; The heated by gas utilizing heated by gas device to be produced by producer gas generator is to the temperature required scope of reduction shaft furnace; By deviating from the process of carbonic acid gas to shaft furnace tail gas, guarantee to enter active principle CO+H in the coal gas of reduction shaft furnace
2>90%, realizes efficient, less energy-consumption reduction.
Accompanying drawing explanation
Fig. 1 is the technical process of coal-based+gas-based shaft kiln process oolitic hematite.
Fig. 2 is gas base+coal-based shaft furnace anti-pelletizing high temperature reduction bonding schematic diagram.
Embodiment
Embodiment 1
Raw material is mass percentage TFe45.27%, SiO
28.21%, Al
2o
35.61%, the oolitic hematite of P0.58%.Proportionally: weight percentage be 80% oolitic hematite, 8% coal, slaked lime 7% and binding agent 5% mix, pressure ball.By reduction shaft furnace, reduction temperature is 1130 DEG C, and the recovery time is 1.5h, reducing gas consists of (H
2: 50%; CO:42%; N
2: 8%), sealing cool to room temperature.By broken for reduced ore, grind after carry out low intensity magnetic separation, the product weight percentage composition TFe92% obtained, phosphorus content 0.10%.
Embodiment 2
Raw material is mass percentage TFe42.1%, SiO
212.4%, Al
2o
36.5%, the oolitic hematite of P0.82%.Proportionally: weight percentage be 78% oolitic hematite, 10% coal, slaked lime 5% and binding agent 7% mix, pressure ball.By reduction shaft furnace, reduction temperature is 1200 DEG C, and the recovery time is 1.2h, reducing gas consists of (H
2: 52%; CO:40%; N
2: 8%), sealing cool to room temperature.By broken for reduced ore, grind after carry out low intensity magnetic separation, the product weight percentage composition TFe94% obtained, phosphorus content 0.13%.
Embodiment 3
Raw material is mass percentage TFe40.7%, SiO
214.4%, Al
2o
37.5%, the oolitic hematite of P0.98%.Proportionally: weight percentage be 82% oolitic hematite, 7% coal, slaked lime 6% and binding agent 5% mix, pressure ball.By reduction shaft furnace, reduction temperature is 1150 DEG C, and the recovery time is 1.0h, reducing gas consists of (H
2: 50%; CO:40%; N
2: 10%), sealing cool to room temperature.By broken for reduced ore, grind after carry out low intensity magnetic separation, the product weight percentage composition TFe90% obtained, phosphorus content 0.16.
Claims (2)
1. process the method that the anti-pelletizing high temperature reduction of high-phosphor oolitic hematite shaft furnace coheres, adopt the gas base+coal-based compound combined direct reduction shaft furnace process high-phosphor oolitic hematite, produce direct-reduced iron; It is characterized in that:
High-phosphor oolitic hematite powder and coal dust, dephosphorizing agent and caking agent are carried out preparing burden in suitable ratio, mixed grind, pressure ball, make cold bound pellet, this agglomerated pellet, through drying or health process, enters direct-reduction shaft furnace; Pelletizing is in direct-reduction shaft furnace, from top to down is experienced heating gas roasting and the prereduction of gas base, coal-based direct reduction and process of cooling, the gas base prereduction of agglomerated pellet experience, coal-based direct reduction temperature range 850 DEG C-1200 DEG C, the residence time in shaft furnace is 1-5h; Reducing gas forms: be H
2/ CO=1.2-4, the pelletizing sealing cooling after reduction, in cooling section exit, agglomerated pellet temperature controls at 100 ~ 200 DEG C, then by agglomerated pellet fragmentation, magnetic separation and briquetting, TFe>=88% in the iron product obtained, phosphorus content <0.3%;
Described agglomerated pellet ultimate compression strength >1500N;
Described reduction shaft furnace adopts the shaft furnace structure of syllogic: shaft furnace is followed successively by pellet roasting and gas base prereduction section, coal-based direct reduction section and cooling section from top to bottom, and the space of shaft furnace and short transverse guarantee that the blanking velocity of pelletizing controls within the scope of 2-8m/h;
In roasting and gas base prereduction section, perpendicular in-furnace temperature controls 850 ~ 950 DEG C of scopes; In coal-based direct reduction section, perpendicular in-furnace temperature controls 950 ~ 1200 DEG C of scopes;
Described oolitic hematite weight percentage TFe:>40%, SiO
2: 4-15%, Al
2o
3: >5%, P:0.4-1.0%;
Described cold bound pellet dual alkalinity is 0.7-1.3; Oolitic hematite weight percentage is 65-85%; Coal blending: 5-20%; Binding agent: 3-7%.
2. method according to claim 1, it is characterized in that, the material of the raising pellet strength added in described agglomerated pellet is siliceous binding agent, prevent from agglomerated pellet surface high-temp from reducing cohering institute with addition of material for being oxidized calcareous, aluminum oxide or magnesia material.
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| CN104212929B (en) * | 2014-08-19 | 2016-06-22 | 北京神雾环境能源科技集团股份有限公司 | The iron smelting method of gas-based shaft kiln directly reduced-magnetic separation separating treatment height phosphorus ore |
| CN104313229B (en) * | 2014-10-30 | 2016-08-24 | 武汉钢铁(集团)公司 | The method producing high ferrophosphorus with shaft kiln directly reduced high phosphorus ore |
| CN104404245B (en) * | 2014-11-19 | 2016-10-05 | 武汉钢铁(集团)公司 | A kind of method utilizing high-phosphor oolitic hematite to produce high-abrasive material |
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| CN105219907A (en) * | 2015-10-14 | 2016-01-06 | 钢铁研究总院 | The iron-smelting process of high-phosphor oolitic hematite gas base directly reducing-mill ore magnetic selection |
| CN105695734A (en) * | 2016-02-24 | 2016-06-22 | 武汉科技大学 | Industrial production method for conducting iron increase and phosphorous reduction on high-phosphorus oolitic hematite |
| CN106222350B (en) * | 2016-08-19 | 2018-08-21 | 安徽工业大学 | A kind of coating material and preparation method thereof for inhibiting iron ore pellets melting and reducing excessively to cohere |
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| CN110066915A (en) * | 2019-04-25 | 2019-07-30 | 西安建筑科技大学 | A kind of method that calcining magnetic separation removes phosphorus in high-phosphor oolitic hematite |
| CN111621611B (en) * | 2020-06-03 | 2021-10-15 | 北京科技大学 | Two-step method for efficiently separating iron and phosphorus from high-phosphorus iron-containing resource based on gas-based energy |
| CN112877491A (en) * | 2021-01-14 | 2021-06-01 | 益晖国际有限公司 | Vertical coal-based and gas-based mixed metal iron direct reduction furnace and process thereof |
| CN114107590B (en) * | 2021-11-26 | 2023-01-10 | 钢铁研究总院 | Pellet oxidizing roasting-pure hydrogen reduction cooling system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1931437A (en) * | 2006-10-12 | 2007-03-21 | 武汉科技大学 | Ore dressing process of oolitic high phosphorus hematite |
| CN101386896A (en) * | 2008-09-24 | 2009-03-18 | 吴道洪 | Ore coal, melting ironmaking method after direct reduction-flotation-agglomeration |
| CN102268503A (en) * | 2011-08-17 | 2011-12-07 | 北京科技大学 | Process method for producing directly reduced iron by using large-particle-size limonite and hematite |
| CN102952940A (en) * | 2011-08-26 | 2013-03-06 | 辽宁东大粉体工程技术有限公司 | Flash-distillation cracking and magnetizing roasting method of oolitic hematite |
| CN103014212A (en) * | 2012-12-21 | 2013-04-03 | 北京科技大学 | Technical method for producing metal iron powder by using carbon-containing high-phosphorus oolitic hematite pellet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8690986B2 (en) * | 2010-09-03 | 2014-04-08 | Forest Vue Research, Llc | Method for simultaneously producing iron, coke, and power |
-
2013
- 2013-10-25 CN CN201310512779.0A patent/CN103667687B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1931437A (en) * | 2006-10-12 | 2007-03-21 | 武汉科技大学 | Ore dressing process of oolitic high phosphorus hematite |
| CN101386896A (en) * | 2008-09-24 | 2009-03-18 | 吴道洪 | Ore coal, melting ironmaking method after direct reduction-flotation-agglomeration |
| CN102268503A (en) * | 2011-08-17 | 2011-12-07 | 北京科技大学 | Process method for producing directly reduced iron by using large-particle-size limonite and hematite |
| CN102952940A (en) * | 2011-08-26 | 2013-03-06 | 辽宁东大粉体工程技术有限公司 | Flash-distillation cracking and magnetizing roasting method of oolitic hematite |
| CN103014212A (en) * | 2012-12-21 | 2013-04-03 | 北京科技大学 | Technical method for producing metal iron powder by using carbon-containing high-phosphorus oolitic hematite pellet |
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