CN101003852A - Method for preparing hot pressed balls of iron ore concentrate and powdered coal - Google Patents
Method for preparing hot pressed balls of iron ore concentrate and powdered coal Download PDFInfo
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Abstract
This invention discloses a method for preparing hot briquettes from iron concentrate and coal powder. The method comprises: pre-heating coal powder, iron concentrate and quicklime powder, mixing, hot-pressing by a double-roller press, and performing post-treatment at 550-600 deg.C for 20-30 min. The hot briquettes can be used as the raw material for iron smelting in blast furnace, and have such advantages as excellent high-temperature strength, good reduction capacity, good melt-dripping property, and low energy consumption. The method can improve the raw material suitability of iron industry.
Description
Technical field
The invention belongs to the smelting iron and steel technical field, relate to blast furnace and fused reduction iron-smelting technology, be specifically related to the preparation method of hot pressed balls of iron ore concentrate and powdered coal.
Background technology
Continuous 9 years rank the first in the world of China's output of steel, output of steel reached 3.48 hundred million tons in 2005, became genuine Iron and Steel Production big country and even iron and steel power.The developing rapidly of Iron And Steel Industry becomes that Chinese national economy continues, the important support condition of steady progression, and promoted the development and the technical progress of related industries.But resource, the energy consumption of domestic existing Steel Production Flow Chart are big, and production efficiency is on the low side; The steel industry concentration degree is low, weak capacity for independent innovation; New process development lags behind, and the melting and reducing technology is in the pilot-plant test level for a long time; The irrational excessive use of China's coking coal resource has not only caused the serious wasting of resources and environmental pollution, and will become the potential collision hazard that hinders the Iron And Steel Industry sound development.The problems referred to above all will restrict the Sustainable development of China's Iron And Steel Industry.For this reason, greatly develop the industry policy of recycling economy, reduction iron and steel energy consumption and material consumption, raising resource and comprehensive utilization of energy level according to national Iron And Steel Industry, Important Project with technological updating of enterprises and technology introduction is an opportunity, to put forth effort to develop efficient technique of rainwater utilization with the resource and the energy be prerequisite, have the melting and reducing technology of new generation of independent intellectual property right and radiation effect, not only make China will lead international Iron and Steel Production technology trend, capture the WeiLai Technology commanding elevation, and be one of important channel that solves iron and steel two decent job Sustainable developments.
From the whole world, reasonable resources utilization and cleaner production have become the development theme of steel industry.Though China is big steel country, still be faced with stern challenge aspect crude fuel resource, energy consumption and the cleaner production, address these problems the great demand that becomes China's Iron And Steel Industry development strategy.A new generation's smelting reduction process is one of contemporary metallurgical great cutting edge technology, also is one of important channel that solves sustainable development of iron and steel industry.Its major technique characteristics are: 1) briquet replacing coke direct production molten iron, and effective use of energy sources can alleviate the dependence of Iron And Steel Industry to coking coal resource; 2) can realize the dual function of Iron and Steel Production and Energy conversion; 3) reduce pollution, help environment protection; 4) coking, sintering and three operations of blast-furnace smelting are shortened to the melting and reducing operation, simplify Production Flow Chart, enhance productivity.In China, along with being becoming tight the day of coking coal supply and to the increasingly stringent of environmental requirement, the advantage of melting and reducing technology becomes more outstanding.Therefore exploitation is suitable for the china natural resources condition, the fused reduction iron-smelting technology of new generation that helps environment protection is urgent all the more.This will realize that the iron and steel flow process is middle mind-set with steel products and is utilized as the transfer at center as a means of source and high efficiency of energy, realize Iron and Steel Production idea and technical innovation.Exploitation by force, does not rely on the environment-friendly type of metallurgical coke to adaptability to raw material fused reduction iron-smelting novel process is the trend of the metallurgical development of world steel, also is the important prerequisite that China's Iron And Steel Industry realizes Sustainable development.
Resource, the energy and environmental problem are the huge challenge problems that the mankind nowadays social development faces jointly.Compare with international most advanced level, the gap of China's Iron And Steel Industry mainly shows aspects such as new process development hysteresis such as the energy of product and resource consume excessively, the high efficiency production level is low, product specification is lower, melting and reducing.Shorten these gaps, promote the integral level of China's steel industry, beyond doubt the great demand of China's economic construction and social development.Domestic iron and steel enterprises is tempered through market in a few years, no matter equipment, to aspects such as the assurance degree of new technology and economic strengths, all obtain unprecedented raising, in the process of STEEL INDUSTRY CONSTRUCTION ADJUSTMENT, each iron and steel enterprise pays close attention to the sustainable development of self more, development environment close friend's new technology is had the economic strength of great interest and opposing investment risk.Urgent hope is rebuild traditional industry with new technology, further widens the development in future space.Along with the adjustment and the continuous advancement in technology of Iron And Steel Industry structure, domestic enterprise enters substantial phase to melting and reducing technology introduction and research and development.According to statistics, iron and steel enterprise of family and offshore company have signed the letter of intent of all kinds of introductions and cooperative development surplus in the of domestic existing ten.Shanghai Baosteel is introduced fused reduction iron-smelting COREX C-3000 technology from VAI, is applied in new Luojing factory of Pudong Iron And Steel Company, and annual capacity is 1,500,000 tons, estimates operation in 2006.In addition, in August, 2003, Laigang group and Australian Rio Tinto Group have also signed agreement, intend introducing the fused reduction iron-smelting technology of Hlsmelt company.Shougang Group occupies 5% share in Hlsmelt joint venture company, what obtained direct melting and reducing technology uses and promote power.For avoiding in a large amount of importation of redundant technical facilities and ignore and follow the track of the overturned cart aspect the independent development, developing the fused reduction iron-smelting technology that China has independent intellectual property right has been extremely urgent.
What obtain maximum achievements in research and be applied to directly reduction and melting and reducing is cold bound pellet.It is by the iron content powder be equipped with solid reductant (coal dust and coke powder) with suitable binding agent thorough mixing after pelletizer is made the cold pressing block that ball or ball press compacting form.Common cold pressing block method comprises water glass concretion method, high-pressure steaming and cultivating method, carbonatation process concretion method and cement concretion method etc.Cold bound pellet is actual to be the mechanical mixture of ferric charge, binding agent and carbon raw material.Employed binding agent comprises organic binder bond and mineral binder bond.Cold fixed nodulizing none example success still at present of using organic binder bond to make with the whole bag of tricks.Carbonaceous pelletizing can enlarge the reaction interface of ferriferous oxide and carbon, reduce the diffusion stroke of gas in solid phase, for reduction reaction is created good dynamic conditions, make each pelletizing become an independently autoreduction system, do not need extraneous strong reducing atmosphere, as long as be heated to proper temperature, fast restore voluntarily just.Although this nodulizing has obtained excellent mechanical intensity at normal temperatures, but at high temperature nearly all binding agent occurs just completely losing viscosifying power before the metallic iron crystal stock bonding in cold fixed nodulizing reduction process, exists the problems of use properties aspects such as manufacturing or smelting.After these pelletizings add blast furnace or shaft furnace to, cause that on the one hand the quantity of slag increases, smelting is had a negative impact; On the other hand, because the binding agent that adds in these pelletizings is just losing the ultimate compression strength reduction that viscosity makes pelletizing more than 600 ℃, thereby a large amount of uses of cold bound pellet have been limited.This also is the major cause that domestic many cold-bonded carbonic pellets directly reduce and smelting reduction process is not succeedd and developed.
Heat pressing process can increase the usage quantity of common coal and low-grade iron ore, has strengthened the adaptability of ironmaking to crude fuel.Consider this big steel country low-grade iron ore of China and mill coal reserves reality bigger than normal, hot pressing carbon-containing pelletizing technology application prospect is comparatively wide.At China's ironmaking crude fuel condition, exploitation is feasible hot pressing carbon-containing agglomerate production technology rationally, promotes the application of carbon-bearing lump in blast furnace or melting and reducing shaft furnace, has stronger practical significance.
Summary of the invention
At present Iron and Steel Production present situation and actual crude fuel condition, the invention provides a kind of preparation method of hot pressed balls of iron ore concentrate and powdered coal.
On cold fixed basis, the present invention has developed a kind of carbonaceous pelletizing--the hot pressed balls of iron ore concentrate and powdered coal production technology, and in the fine iron breeze of preheating adds the coal dust of preheating, agitator high speed rotating, fully mixing coal dust and breeze.In blending process, the coal dust post softening fusion of being heated is invaded in the iron-bearing material particulate space or is covered on the particulate surface.Therefore, iron-bearing material fully contacts with coal.After coal dust and breeze adhesive reach design temperature, be released in the pair roller thermocompressor (two rollers rotate simultaneously) hot-forming by evenly mixing device.The hot wafering of first one-step forming is placed in the closed container of thermocompressor bottom, remain under the proper temperature and heat-treat, volatile matter fully volatilizees therebetween, and coal continues to form semicoke, thereby has guaranteed that final hot wafering has enough intensity.Whole process is not added binding agent, and the thermoplasticity that makes full use of coal guarantees the intensity of hot pressing product.
Hot pressed balls of iron ore concentrate and powdered coal of the present invention is formed by fine iron breeze, coal dust, flux mixing hot pressing.The coal powder size that is adopted is: 100% is in 120 orders～200 orders, and wherein-200 order is 30～35%, and the granularity of fine iron breeze is a granularity after the ore dressing, and-200 purposes are greater than 60%, and flux is unslaked lime (CaO) powder, granularity-200 order＞50%.Ratio batching according to weight percent fine iron breeze 60～75%, coal dust 20～35%, calcium lime powder 5～10%, with pulverized coal preheating to 100～200 ℃, fine iron breeze is preheated to 600～750 ℃, calcium lime powder is preheated to 100～200 ℃, fine iron breeze after the preheating, coal dust, flux are mixed 15～20min, the fine iron breeze that thorough mixing is good, coal dust and flux mixture hot-forming (can adopt the pair roller thermocompressor), hot pressing temperature is 350～500 ℃, pressure 25～45MPa.The broken thing of hot pressing is back to fine iron breeze raw material part, enters pre-heating step with fine iron breeze, recycles.Hot pressed balls is carried out aftertreatment, and method is that the hot wafering with first one-step forming places in the closed container of thermocompressor bottom and keeps 20～30min down at 550～600 ℃.
Prepared hot pressing carbon-containing agglomerate can be used as the high-quality iron-smelting raw material of blast furnace or melting and reducing shaft furnace.In general, hot pressing carbon-containing agglomerate of the present invention has following advantage:
1) excellent high-temperature intensity.
The hot pressing carbon-containing agglomerate is compared high-temperature machinery intensity and is obviously improved with cold bound pellet.Experiment showed, the hot pressing carbon-containing agglomerate that under pressure 25～45MPa, obtains by the good coal of thermoplasticity after heat treatment cold conditions ultimate compression strength can be higher than 1200N/.In addition, the ultimate compression strength of hot pressing carbon-containing agglomerate in the high temperature reduction process is also apparently higher than ordinary sinter ore deposit and acid pellet.Therefore, the hot pressing carbon-containing agglomerate satisfies the requirement to the raw material hot strength of blast furnace or melting and reducing shaft furnace.
2) high reductibility.
Because the short grained ferriferous oxide of hot pressing product interior detail closely contacts with carbon, compare reduction reaction with common agglomerate and can under lower temperature, just begin to take place.And have coupling effect in the hot pressing carbon-containing agglomerate, and also be that the gasification of carbon and ferriferous oxide reduction reaction are carried out simultaneously and mutually promoted, finally quicken the reduction of iron-containing charge.Test shows that the reducing property of hot pressing carbon-containing agglomerate will obviously be better than common agglomerate and common acid pellet.Can finish in about 15-20 minute under the reduction reaction of whole hot pressing carbon-containing agglomerate only needs in the time of 1100 ℃.So after using the hot pressing carbon-containing agglomerate, the reaction efficiency of blast furnace or melting and reducing shaft furnace will obviously strengthen.
3) performance is dripped in good fusion.
The iron particle that newly restores in the hot pressing carbon-containing agglomerate fully contacts with tiny carbon granule, and the carburizing speed acceleration is compared with agglomerate and will significantly be reduced so temperature range is dripped in soft heat.By the molten drop test-results as can be known, compare with common flux type agglomerate, the droplet temperature of hot pressing carbon-containing agglomerate reduces about 150 ℃.
4) less energy-consumption.
The high technology temperature that the hot pressing carbon-containing agglomerate is produced only about 700 ℃, with sintering process (1200 ℃) mutually specific energy consumption will significantly reduce.
5) wide application prospect.
Heat pressing process can increase the usage quantity of common coal and low-grade iron ore, strengthens the adaptability of ironmaking to crude fuel.Consider this big steel country low-grade iron ore of China and mill coal reserves reality bigger than normal, hot pressing carbon-containing pelletizing technology application prospect is comparatively wide.
Description of drawings
Fig. 1 is the process flow sheet of the inventive method;
Fig. 2 is the physical dimension synoptic diagram of hot pressed balls.
Embodiment
The fine iron breeze of implementing to use is the Dashiqiao iron ore concentrate, and granularity is a granularity after the ore dressing.Major ingredient sees Table 1.The place of production is Dashiqiao, Liaoning.
The selected result of table 1 Dashiqiao powdered iron ore (wt%)
| Project | T Fe | SiO 2 | Al 2O 3 | CaO | MgO | S | P | Other |
| The Dashiqiao iron ore concentrate | 70.09 | 1.75 | 0.085 | 0.15 | 0.10 | 0.31 | 0.01 | ＜0.021 |
The coal dust that uses is Hengshan Mountain mill coal, and salient features sees Table 2.Granularity is in 120 orders～200 purposes and accounts for 100%, and wherein-200 order is about 30%), the place of production is mining area, Hengshan Mountain, Hegang, Heilungkiang.
The salient features of table 2 Hengshan Mountain mill coal
| Project | Ash content (%) | Volatile matter (%) | Full sulphur (%) | Caking index (-) | Plastometer indice (mm) | |
| Ad | V daf | St.d | G | x | y | |
| Hengshan Mountain mill coal | 9.10 | 33.43 | 0.53 | 75 | 24 | 12 |
Flux is unslaked lime (CaO) powder, Shenyang, the place of production, and purity is 98.0%, granularity-200 order＞50%
The hydropress that peak pressure is 20t is housed on the pair roller thermocompressor.The hot pressing pressure that uses is during as 35MPa, and the cold conditions ultimate compression strength of the hot pressing carbon-containing agglomerate of acquisition is higher than 1200N/.
Embodiment 1
Hot pressed balls of iron ore concentrate and powdered coal is formed by fine iron breeze, coal dust, flux mixing hot pressing.It is 100% that coal powder size is in 120 order to 200 purposes, and wherein-200 order is 33%; The granularity of fine iron breeze is a granularity after the ore dressing, and-200 purposes are greater than 60%; Flux is unslaked lime (CaO) powder, granularity-200 order＞50%.According to weight percent, the ratio of fine iron breeze 65.2%, coal dust 27.9%, calcium lime powder 6.9% batching with pulverized coal preheating to 150 ℃, is preheated to 700 ℃ with fine iron breeze, and calcium lime powder is preheated to 150 ℃.Then, the fine iron breeze after the above-mentioned respectively preheating, coal dust, flux mixed and stir 18min, adopt the pair roller thermocompressor hot-forming in the mixture of fine iron breeze, coal dust and the flux of abundant mixing, hot pressing temperature is 450 ℃, pressure 35MPa.The broken thing of hot pressed balls is back to fine iron breeze raw material part, enters pre-heating step with fine iron breeze, recycles.Hot pressed balls is carried out aftertreatment, the hot wafering of first one-step forming is placed in the closed container of thermocompressor bottom, keep 20min to get final product down at 600 ℃.
The physical and chemical index data of agglomerate:
The hot pressed balls profile is seen Fig. 1, is of a size of 21 * 19 * 13mm, the about 4.1cm of volume
3, weight 7g/.
For material condition (Dashiqiao iron ore concentrate 65.2wt%; Hengshan Mountain mill coal 27.9wt%; Calcium lime powder 6.9wt%) time, the ultimate compression strength of thermal treatment hot pressing product is not at 1140～1280N/, about average out to 1210N/.
After 600 ℃ of above-mentioned hot waferings were heat-treated, ultimate compression strength obviously rose, and was 1400～1600N/, average 1480N/; The ultimate compression strength that records behind 1100 ℃ of following reductase 12 0min air coolings is 1410～1550N/, average 1440N/.
The fusion drippage temperature of above-mentioned hot wafering is 1345 ℃, is starkly lower than present flux type agglomerate and ordinary oxygen pellet.
Embodiment 2
Hot pressed balls of iron ore concentrate and powdered coal is formed by fine iron breeze, coal dust, flux mixing hot pressing.It is 100% that coal powder size is in 120 order to 200 purposes, and wherein-200 order is 35%; The granularity of fine iron breeze is a granularity after the ore dressing, and-200 purposes are greater than 60%; Flux is unslaked lime (CaO) powder, granularity-200 order＞50%.According to the ratio of weight percent fine iron breeze 75%, coal dust 20%, calcium lime powder 5% batching, with pulverized coal preheating to 200 ℃, fine iron breeze is preheated to 750 ℃, calcium lime powder is preheated to 200 ℃.Then, the fine iron breeze after the above-mentioned respectively preheating, coal dust, flux mixed and stir 20min, adopt the pair roller thermocompressor hot-forming in the mixture of fine iron breeze, coal dust and the flux of abundant mixing, hot pressing temperature is 500 ℃, pressure 25MPa.The broken thing of hot pressed balls is back to fine iron breeze raw material part, enters pre-heating step with fine iron breeze, recycles.Hot pressed balls is carried out aftertreatment, the hot wafering of first one-step forming is placed in the closed container of thermocompressor bottom, keep 30min to get final product down at 550 ℃.
Embodiment 3
Hot pressed balls of iron ore concentrate and powdered coal is formed by fine iron breeze, coal dust, flux mixing hot pressing.It is 100% that coal powder size is in 120 order to 200 purposes, and wherein-200 order is 30%; The granularity of fine iron breeze is a granularity after the ore dressing, and-200 purposes are greater than 60%; Flux is unslaked lime (CaO) powder, granularity-200 order＞50%.According to the ratio of weight percent fine iron breeze 60%, coal dust 32%, calcium lime powder 8% batching, with pulverized coal preheating to 100 ℃, fine iron breeze is preheated to 600 ℃, calcium lime powder is preheated to 100 ℃.Then, the fine iron breeze after the above-mentioned respectively preheating, coal dust, flux mixed and stir 15min, adopt the pair roller thermocompressor hot-forming in the mixture of fine iron breeze, coal dust and the flux of abundant mixing, hot pressing temperature is 400 ℃, pressure 45MPa.The broken thing of hot pressed balls is back to fine iron breeze raw material part, enters pre-heating step with fine iron breeze, recycles.Hot pressed balls is carried out aftertreatment, the hot wafering of first one-step forming is placed in the closed container of thermocompressor bottom, keep 25min to get final product down at 580 ℃.
Claims (3)
1, a kind of preparation method of hot pressed balls of iron ore concentrate and powdered coal, it is characterized in that with fine iron breeze, coal dust and calcium lime powder are raw material, according to weight percent fine iron breeze 60～75%, coal dust 20～35%, the ratio batching of calcium lime powder 5～10%, with pulverized coal preheating to 100～200 ℃, fine iron breeze is preheated to 600～750 ℃, calcium lime powder is preheated to 100～200 ℃, with the fine iron breeze after the preheating, coal dust and calcium lime powder mix 15～20min, with the fine iron breeze that mixes, coal dust and calcium lime powder mixture are hot-forming, hot pressing temperature is 350～500 ℃, pressure 25～45MPa places the hot wafering of first one-step forming in the closed container of thermocompressor bottom to keep 20～30min down at 550～600 ℃.
2, according to the preparation method of the described hot pressed balls of iron ore concentrate and powdered coal of claim 1, it is characterized in that the coal powder size that is adopted is: 100% is in 120 orders～200 orders, wherein-200 order is 30～35%, the granularity of fine iron breeze is a granularity after the ore dressing,-200 purposes are greater than 60%, calcium lime powder granularity-200 order＞50%.
3, according to the preparation method of the described hot pressed balls of iron ore concentrate and powdered coal of claim 1, it is characterized in that the broken thing of hot pressed balls is back to fine iron breeze raw material part, enter pre-heating step with fine iron breeze, recycle.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104873B (en) * | 2007-07-31 | 2010-05-19 | 东北大学 | Method for fusing and reducing iron by employing iron ore hot pressing carbon-containing agglomerate |
| CN102560095A (en) * | 2012-02-08 | 2012-07-11 | 河北钢铁股份有限公司邯郸分公司 | Process and special equipment for blocking carbon-containing briquette by hot tamping |
| CN103255284A (en) * | 2013-05-27 | 2013-08-21 | 南京钢铁股份有限公司 | Method for processing and utilizing low-quality iron ore powder |
| CN103572044A (en) * | 2013-10-12 | 2014-02-12 | 酒泉钢铁(集团)有限责任公司 | Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder |
| CN103937971A (en) * | 2014-04-29 | 2014-07-23 | 东北大学 | Preparation method of iron-ore hot-pressed carbon-containing pellet and iron-making raw material |
| CN105039613A (en) * | 2015-08-25 | 2015-11-11 | 东北大学 | Method for recycling metal particles from steel making dust |
| CN107177732A (en) * | 2017-05-19 | 2017-09-19 | 安徽工业大学 | It is a kind of to prepare high strength bainite agglomerate and gas iron co-production as bonding carrier with biomass |
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2007
- 2007-01-18 CN CNB2007100100974A patent/CN100529121C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104873B (en) * | 2007-07-31 | 2010-05-19 | 东北大学 | Method for fusing and reducing iron by employing iron ore hot pressing carbon-containing agglomerate |
| CN102560095A (en) * | 2012-02-08 | 2012-07-11 | 河北钢铁股份有限公司邯郸分公司 | Process and special equipment for blocking carbon-containing briquette by hot tamping |
| CN102560095B (en) * | 2012-02-08 | 2013-06-12 | 河北钢铁股份有限公司邯郸分公司 | Process and special equipment for blocking carbon-containing briquette by hot tamping |
| CN103255284A (en) * | 2013-05-27 | 2013-08-21 | 南京钢铁股份有限公司 | Method for processing and utilizing low-quality iron ore powder |
| CN103572044A (en) * | 2013-10-12 | 2014-02-12 | 酒泉钢铁(集团)有限责任公司 | Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder |
| CN103572044B (en) * | 2013-10-12 | 2015-03-04 | 酒泉钢铁(集团)有限责任公司 | Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder |
| CN103937971A (en) * | 2014-04-29 | 2014-07-23 | 东北大学 | Preparation method of iron-ore hot-pressed carbon-containing pellet and iron-making raw material |
| CN103937971B (en) * | 2014-04-29 | 2017-01-04 | 东北大学 | The preparation method of iron ore hot pressing carbon-containing pelletizing and iron-smelting raw material |
| CN105039613A (en) * | 2015-08-25 | 2015-11-11 | 东北大学 | Method for recycling metal particles from steel making dust |
| CN107177732A (en) * | 2017-05-19 | 2017-09-19 | 安徽工业大学 | It is a kind of to prepare high strength bainite agglomerate and gas iron co-production as bonding carrier with biomass |
| CN107177732B (en) * | 2017-05-19 | 2019-05-17 | 安徽工业大学 | It is a kind of that biomass is used to prepare high strength bainite agglomerate and gas iron co-production as bonding carrier |
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| CN100529121C (en) | 2009-08-19 |
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