CN103937971B - The preparation method of iron ore hot pressing carbon-containing pelletizing and iron-smelting raw material - Google Patents

The preparation method of iron ore hot pressing carbon-containing pelletizing and iron-smelting raw material Download PDF

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CN103937971B
CN103937971B CN201410178473.0A CN201410178473A CN103937971B CN 103937971 B CN103937971 B CN 103937971B CN 201410178473 A CN201410178473 A CN 201410178473A CN 103937971 B CN103937971 B CN 103937971B
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coal
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iron
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CN103937971A (en
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储满生
柳政根
王宏涛
唐珏
赵伟
冯聪
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Northeastern University China
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Abstract

The invention discloses preparation method and the iron-smelting raw material of a kind of iron ore hot pressing carbon-containing pelletizing, this preparation method comprises the following steps: first, by Iron Ore Powder, coal dust, flux mix homogeneously, to obtain the first material, wherein, the content of the Iron Ore Powder in the first material is 60wt%~80wt%, and the content of coal dust is 20wt%~40wt%, and the content of flux is 0wt%~10wt%;Then, it is hot-forming for pelletizing, to obtain the second material after the first material is heated to 100 DEG C~300 DEG C;Finally, the second material is placed in tunnel cave or coal base shaft furnace in the way of dry distilling, carries out heat treatment, with prepared iron ore hot pressing carbon-containing pelletizing, wherein, the temperature of heat treatment is 800 DEG C~1100 DEG C, and the time of heat treatment is 4h~6h, and the atmosphere controlling heat treatment is neutral or reducing atmosphere.Preparation in accordance with the present invention can reduce energy consumption, simplification of flowsheet and improve production efficiency, it is possible to meets iron and steel and produces the requirement to energy consumption, cost and environmental protection, has wide prospects for commercial application.

Description

The preparation method of iron ore hot pressing carbon-containing pelletizing and iron-smelting raw material
Technical field
The invention belongs to metallurgical technology field, in particular it relates to a kind of iron ore hot pressing carbon-containing ball The preparation method of group.
Background technology
The theme of development of iron & steel industry is efficient, low-carbon (LC) and green.Blast furnace as iron and steel produce most important One of unit, produces the pig iron in more than whole world 95wt%, its energy expenditure and CO2Discharge capacity all accounts for About the 70% of whole steel and iron industry.Ironmaking system (including sintering, pelletizing, coking, blast furnace) energy consumption is Height, and environment is caused the biggest impact (mainly CO2, the discharge of dust etc.).It addition, along with iron and steel The increase year by year of yield is the biggest to the demand of crude fuel.But, high-quality Mineral Resource is limited, High-grade high-quality original fuel consumption is totally.Therefore, the increase to the usage amount of second-rate crude fuel, Sintering deposit and pellet are produced and faces great difficulty, also increased the weight of the burden of blast furnace process simultaneously, led Cause its smelting index to decline.It addition, high-quality coal for coking resource is the deficientest in world wide, Er Qiejiao Charcoal price is extremely expensive.Therefore, for the lasting benign development of steel industry, various countries are devoted to exploitation Reform novel Ferrous Metallurgy technology.From energy-conservation, resource reutilization and the environmental conservation angle of metallurgical production Degree sets out, and carbonaceous pelletizing, as a kind of new high-quality iron-smelting furnace charge, enjoys favor always.
Carbonaceous pelletizing mostly is the Iron Ore Powder by being equipped with solid reductant (such as coal dust) and suitable binding agent After being sufficiently mixed, through Iron Ore Powder pelletizing or the agglomerate of the compressing a kind of carbon containing of pelletizer or ball press. Rate of reduction is big, raw material sources extensive, save the advantage such as coking and sintering process because having for carbonaceous pelletizing, No matter efficiently smelt iron at blast furnace, or all receive much concern in briquet replacing coke.
The production carbonaceous pelletizing of prior art uses and freezes off knot production method.Due to carbonaceous pelletizing elevated temperature strength Difference and use substantial amounts of binding agent in its production process, so can cause the generation of such as following problem: Quantity of slag increase and energy consumption raising etc. in production cost raising, smelting process.The generation of the problems referred to above limits The further development of the production method of existing carbonaceous pelletizing.
Notification number is that the Chinese patent literature of CN100529121C discloses a kind of iron ore concentrate and powdered coal hot pressing group The preparation method of block, in this preparation method, fine iron breeze, coal dust and calcium lime powder three heat respectively To 600 DEG C~750 DEG C, 100 DEG C~200 DEG C and 100 DEG C~200 DEG C, then it is mixed and is heated to After 350 DEG C~500 DEG C hot-forming.The method has prepared the hot wafering that metallurgical performance is excellent, but this side The preheating temperature of the material of method is high, hot pressing temperature is high, energy consumption is big, technique is complex and sets hot pressing Standby heat insulation performance has higher requirement.
Summary of the invention
Present invention seek to address that the deficiency that prior art exists, it is provided that one have low energy consumption, technique simple, The preparation method of the iron ore hot pressing carbon-containing pelletizing that production efficiency is high, the method meet iron and steel produce to low energy consumption, Low cost and the requirement of environmental protection.
According to the preparation method of a kind of iron ore hot pressing carbon-containing pelletizing disclosed by the invention, comprise the following steps: First, by Iron Ore Powder, coal dust, flux mix homogeneously, to obtain the first material, wherein, the first material In the content of Iron Ore Powder be 60wt%~80wt%, the content of coal dust is 20wt%~40wt%, flux Content is 0wt%~10wt%;Then, it is hot pressed into after the first material being heated to 100 DEG C~300 DEG C Type is pelletizing, to obtain the second material;Finally, the second material is placed in tunnel cave or coal base shaft furnace with The mode of dry distilling carries out heat treatment, and with prepared iron ore hot pressing carbon-containing pelletizing, wherein, the temperature of heat treatment is 800 DEG C~1100 DEG C, the time of heat treatment is 4h~6h, and the atmosphere controlling heat treatment is neutral or reproducibility Atmosphere.
Preparation in accordance with the present invention, the content of the ferrum in Iron Ore Powder is not less than 45wt%;Coal dust is 1/3 Coking coal, 1/3 coking coal and rich coal, 1/3 coking coal and anthracite or 1/3 coking coal and weak caking coal, wherein, The content of rich coal is less than the 40wt% of coal dust total amount, and anthracitic content is less than coal dust total amount 10wt%, the content of weak caking coal is less than the 20wt% of coal dust total amount, and the fixed carbon in coal dust Content is not less than 50wt%, and the content of ash is not higher than 15wt%, and the content of volatile matter is not higher than 35wt%; Flux is metallurgy lime or calcined wagnerite, the most fluxed is not less than 70wt%;Iron Ore Powder, coal dust with And the granularity of flux is no more than 0.15mm.
Preparation in accordance with the present invention, hot-forming pressure can be not less than 35MPa.
Preparation in accordance with the present invention, hot-forming equipment can be to roller hot press, to roller hot pressing The line pressure of machine can be not less than 3.0t/cm.
Preparation in accordance with the present invention, pelletizing can be 20mm~30mm × 15~25mm × 10~15mm The ellipsoidal particle of size.
According to a kind of iron-smelting raw material of the present invention, described iron-smelting raw material can include any of the above-described kind of side of preparation The Carbon Composite Iron Ore Hot Briquette that method is prepared.
In general, according to the preparation method of the iron ore hot pressing carbon-containing pelletizing of the present invention, have the advantage that
(1) process simplification, energy consumption significantly reduces.Iron Ore Powder, coal dust and flux are first weighed also by the present invention Fully mixing, the preparation method then reheated significantly simplify technological process;Meanwhile, it is greatly lowered Heating-up temperature significantly reduce energy consumption and reduce carrying capacity of environment.
(2) excellent comprcssive strength.Compared with the carbonaceous pelletizing that prior art produces, according to the present invention's The cold conditions comprcssive strength of iron ore hot pressing carbon-containing pelletizing prepared by preparation method increases.It is demonstrated experimentally that according to this The cold conditions comprcssive strength of iron ore hot pressing carbon-containing pelletizing prepared by the preparation method of invention, higher than 2000N/, falls Lower intensity is more than 4 times/, fully meets the use requirement of blast furnace ironmaking furnace charge.It addition, iron ore hot pressing contains The pelletizing that the high temperature compression strength of carbon pellets is produced apparently higher than prior art.Therefore, it can at blast furnace Comprehensive furnace charge adds appropriate Carbon Composite Iron Ore Hot Briquette, to be effectively improved the breathability of blast furnace stock column, thus Realize efficiently smelting.
(3) excellent reducing property.Iron ore hot pressing carbon-containing pelletizing self is with reducing agent, and has good Microstructure, provide good dynamic conditions for reduction reaction.And its internal existence couples instead Should, i.e. gasification reaction and the iron oxides reduction reaction of carbon carries out simultaneously and mutually promotes, and may finally add The reduction of speed iron-containing charge.Further, the iron ore hot pressing carbon-containing pelletizing that prepared by preparation in accordance with the present invention Having the percent reduction being not less than 60%, its percent reduction is equivalent to metallized pellet.Therefore, iron ore hot pressing contains The reproducibility of carbon pellets is better than other furnace charges such as ordinary sinter ore deposit and acid pellet, and blast furnace uses will be the most aobvious Write ground and reduce coke consumption.
(4) excellent soft melting dropping performance.Iron ore hot pressing carbon-containing prepared by preparation in accordance with the present invention The ferrum granule newly restored in pelletizing can be fully contacted with tiny carbon granule, accelerates entering of carburization reaction OK, therefore compared with sintering deposit, the iron ore hot pressing carbon-containing pelletizing that prepared by preparation in accordance with the present invention soft The molten drop temperature range that falls will be greatly reduced.From molten drop result of the test, with common high basicity sinter phase Ratio, the droplet temperature of Carbon Composite Iron Ore Hot Briquette prepared by preparation in accordance with the present invention reduces 100 DEG C~200 DEG C.
(5) wide prospects for commercial application.Iron ore hot pressing carbon-containing prepared by preparation in accordance with the present invention Pelletizing can increase common coal, weak caking coal, low-grade iron ore, containing water of crystallization iron mine and iron dust containing Usage amount, such that it is able to improve the iron-smelting process adaptability to raw material.It addition, according to the system of the present invention Carbon Composite Iron Ore Hot Briquette prepared by Preparation Method, compared with cold bound pellet and other iron-smelting raw materials, has high temperature strong Degree is high, reducing property strong and the feature such as fast reduction in low temperature.Meanwhile, preparation in accordance with the present invention The technological process of production simple, hot pressing temperature is low.Therefore, the heat that prepared by preparation in accordance with the present invention Pressure carbonaceous pelletizing has wide prospects for commercial application.
Detailed description of the invention
Further describe the present invention, advantages of the present invention and feature below in conjunction with specific embodiment can retouch In stating apparent, but these embodiments approximation exemplary in nature, to the scope of the present invention constitute not any Limit.
Embodiment 1
First, granularity is respectively less than 0.15mm Iron Ore Powder, 1/3 coking coal and metallurgy lime mix homogeneously, Thus obtain the first material.Wherein, the content of the Iron Ore Powder in the first material is 63.3wt%, and granularity is little Iron Ore Powder by volume percentages in 0.075mm accounts for the 60% of the total addition of Iron Ore Powder, the master of Iron Ore Powder Want composition as shown in table 1;The content of 1/3 coking coal is 32.6wt%, and granularity is burnt less than the 1/3 of 0.075mm Coal by volume percentages accounts for the 90% of total addition of 1/3 coking coal, the chemical composition of 1/3 coking coal such as table 2 Shown in;The content of metallurgy lime is 4.1wt%, the granularity metallurgy lime by volume percentage less than 0.075mm Account for than meter metallurgy lime total addition 100%, metallurgy lime the most fluxed for 85wt%.
Secondly, after the first material is heated to 200 DEG C, rapidly by it under conditions of pressure is 40Mpa It is hot pressed into the second material of the elliposoidal pelletizing of 22mm × 18mm × 12mm.
Finally, the second material is placed in tunnel cave, and under neutral atmosphere, in the way of dry distilling Two materials carry out preheating, heat treatment and cooling, thus obtain iron ore hot pressing carbon-containing pelletizing.Wherein, heat The time processed is 5h, and the temperature of heat treatment is 850 DEG C.
The physical and chemical index data of the iron ore hot pressing carbon-containing pelletizing that the preparation method according to the present embodiment prepares As follows:
The cold conditions comprcssive strength of the iron ore hot pressing carbon-containing pelletizing not carrying out heat treatment is 858N/, falls strong Degree is 5.8 times/.
The comprcssive strength of the iron ore hot pressing carbon-containing pelletizing carrying out the cold conditions obtained after heat treatment is 3250N/ Individual, drop strength is 9.4 times/, reduction degradation index RDI+3.15It is 86.7%, reduction swellability sex index RSI is 7.5%, and percent reduction reaches 75%, and drippage temperature is 1346 DEG C.Above-mentioned physical and chemical index is the lowest The high basicity sinter prepared in prior art and the physical and chemical index of acidic pellet ore.
Embodiment 2
First, granularity is respectively less than 0.15mm Iron Ore Powder, 1/3 coking coal, anthracite coal dust and metallurgical stone Ash mix homogeneously, thus obtain the first material.Wherein, the content of the Iron Ore Powder in the first material is 72.7wt%, the granularity Iron Ore Powder by volume percentages less than 0.075mm accounts for the total addition of Iron Ore Powder 70%, the main component of Iron Ore Powder is as shown in table 1;The content of 1/3 coking coal is 24.0wt%, and granularity is less than The 1/3 coking coal by volume percentages of 0.075mm accounts for the 90% of total addition of 1/3 coking coal, 1/3 coking coal Chemical composition as shown in table 2;The content of anthracite coal dust is 2.3wt%, and granularity is less than 0.075mm's Anthracite coal dust by volume percentages accounts for the 90% of total addition of anthracite coal dust, anthracite coal dust Chemical composition is as shown in table 3;The content of metallurgy lime is 1.0wt%, the granularity metallurgy less than 0.075mm Calx by volume percentages accounts for the 100% of total addition of metallurgy lime, metallurgy lime the most fluxed For 87wt%.
Secondly, after the first material is heated to 120 DEG C, rapidly by it under conditions of pressure is 40Mpa It is hot pressed into the second material of the elliposoidal pelletizing of 25mm × 20mm × 13mm.
Finally, the second material is placed in tunnel cave, and under non-oxidizing atmosphere, in the way of dry distilling Second material is preheated, heat treatment and cooling, thus obtain iron ore hot pressing carbon-containing pelletizing.Wherein, The time of heat treatment is 4.3h, and the temperature of heat treatment is 1000 DEG C.
The physical and chemical index data of the iron ore hot pressing carbon-containing pelletizing that the preparation method according to the present embodiment prepares As follows:
The cold conditions comprcssive strength of the iron ore hot pressing carbon-containing pelletizing not carrying out heat treatment is 746N/, falls strong Degree is 5.2 times/.
The comprcssive strength of the iron ore hot pressing carbon-containing pelletizing carrying out the cold conditions obtained after heat treatment is 2948N/ Individual, drop strength is 8.2 times/, reduction degradation index RDI+3.15It is 85.1%, reduction swellability sex index RSI is 8.3%, and percent reduction reaches 72%, and drippage temperature is 1384 DEG C.Above-mentioned physical and chemical index is the lowest The high basicity sinter prepared in prior art and the physical and chemical index of acidic pellet ore.
Embodiment 3
First, granularity is respectively less than 0.15mm Iron Ore Powder, 1/3 coking coal, weak caking coal coal dust and smelting Metal and stone ash mix homogeneously, thus obtain the first material.Wherein, the content of the Iron Ore Powder in the first material is 78.6wt%, the granularity Iron Ore Powder by volume percentages less than 0.075mm accounts for total addition of Iron Ore Powder 60%, the main component of Iron Ore Powder is as shown in table 1;The content of 1/3 coking coal is 18.3wt%, and granularity is little 1/3 coking coal by volume percentages in 0.075mm accounts for the 90% of total addition of 1/3 coking coal, and 1/3 is burnt The chemical composition of coal is as shown in table 2;The content of weak caking coal coal dust is 2.0wt%, and granularity is less than The anthracite coal dust by volume percentages of 0.075mm accounts for the 90% of total addition of anthracite coal dust, weak The chemical composition of binding coal coal dust is as shown in table 4;The content of metallurgy lime is 1.1wt%, and granularity is less than The metallurgy lime of 0.075mm by volume percentages accounts for the 100% of total addition of metallurgy lime, metallurgical stone Grey is the most fluxed for 87wt%
Secondly, after the first material is heated to 280 DEG C, rapidly by it under conditions of pressure is 40Mpa It is hot pressed into the second material of the elliposoidal pelletizing of 28mm × 24mm × 14mm.
Finally, the second material is placed in tunnel cave, and under non-oxidizing atmosphere, in the way of dry distilling Second material is preheated, heat treatment and cooling, thus obtain iron ore hot pressing carbon-containing pelletizing.Wherein The time of heat treatment is 5.8h, and the temperature of heat treatment is 1100 DEG C.
The physical and chemical index data of the iron ore hot pressing carbon-containing pelletizing that the preparation method according to the present embodiment prepares As follows:
The cold conditions comprcssive strength of the iron ore hot pressing carbon-containing pelletizing not carrying out heat treatment is 760N/, falls strong Degree is 4.2 times/.
The comprcssive strength of the iron ore hot pressing carbon-containing pelletizing carrying out the cold conditions obtained after heat treatment is 2546N/ Individual, drop strength is 7.8 times/, reduction degradation index RDI+3.15It is 84.5%, reduction swellability sex index RSI is 7.8%, and percent reduction reaches 76%, and drippage temperature is 1360 DEG C.Above-mentioned physical and chemical index is the lowest The high basicity sinter prepared in prior art and the physical and chemical index of acidic pellet ore.
From three above embodiment it can be seen that preparation in accordance with the present invention is based on " 1/3 coking coal ", Multiple coal can be added simultaneously.In the case of breeze, coal dust, ground flux proportions are more or less the same, When using 1/3 coking coal completely in hot press forming technology, required hot pressing temperature is low, heat treatment temperature is low, product Product index is the most excellent.But due to regional difference, the price of various places 1/3 coking coal is not quite similar, considering Under conditions of production cost, in the cheap area of anthracite, a small amount of anthracite can be added in dispensing, Replacing part 1/3 coking coal, trace improves briquetting temperature and heat treatment temperature simultaneously, and the product produced refers to Mark is declined slightly with when using 1/3 coking coal completely, but still relatively conventional sintering ore deposit and pellet function admirable; In the cheap area of weak caking coal, the weak caking coal of relatively volume can be added to replace part 1/3 Coking coal, can improve briquetting temperature and heat treatment temperature simultaneously, and the metallurgical performance of prepared product is the most remote It is better than the metallurgical performance of the quality raw materials of tradition blast furnace ironmaking.
The main component (wt%) of table 1 Iron Ore Powder
The main component (wt%) of table 2 1/3 coking coal coal dust
The main component (wt%) of table 3 anthracite coal dust
The main component (wt%) of table 4 weak caking coal coal dust

Claims (5)

1. the preparation method of an iron ore hot pressing carbon-containing pelletizing, it is characterised in that the method includes following step Rapid:
First, by Iron Ore Powder, coal dust, flux mix homogeneously, to obtain the first material, wherein, first The content of the Iron Ore Powder in material is 60wt%~80wt%, and the content of coal dust is 20wt%~40wt%, molten The content of agent is 0wt%~10wt%;
Then, it is hot-forming for pelletizing, to obtain after the first material is heated to 100 DEG C~300 DEG C Second material;
Finally, the second material is placed in tunnel cave or coal base shaft furnace in the way of dry distilling, carries out heat treatment, With prepared iron ore hot pressing carbon-containing pelletizing, wherein, the temperature of heat treatment is 800 DEG C~1100 DEG C, heat treatment Time is 4~6h, and the atmosphere controlling heat treatment is neutral or reducing atmosphere,
Wherein, the iron content in Iron Ore Powder is not less than 45wt%;Coal dust be 1/3 coking coal, 1/3 coking coal and Rich coal, 1/3 coking coal and anthracite or 1/3 coking coal and weak caking coal, wherein, the content of rich coal does not surpasses Crossing the 40wt% of coal dust total amount, anthracitic content is less than the 10wt% of coal dust total amount, weak caking coal Content less than the 20wt% of coal dust total amount, and the content of the fixed carbon in coal dust is not less than 50wt%, The content of ash is not higher than 15wt%, and the content of volatile matter is not higher than 35wt%;Flux be metallurgy lime or Calcined wagnerite, the most fluxed is not less than 70wt%;The granularity of Iron Ore Powder, coal dust and flux is the most not More than 0.15mm.
Preparation method the most according to claim 1, it is characterised in that hot-forming pressure is the least In 35MPa.
Preparation method the most according to claim 1, it is characterised in that hot-forming equipment is right Roller hot press, is not less than 3.0t/cm to the line pressure of roller hot press.
Preparation method the most according to claim 1, it is characterised in that pelletizing is 20~the ellipsoidal particle of size of 30mm × 15~25mm × 10~15mm.
5. an iron-smelting raw material, it is characterised in that described iron-smelting raw material includes described in Claims 1 to 4 The Carbon Composite Iron Ore Hot Briquette prepared of any one preparation method.
CN201410178473.0A 2014-04-29 2014-04-29 The preparation method of iron ore hot pressing carbon-containing pelletizing and iron-smelting raw material Active CN103937971B (en)

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CN109439896B (en) * 2018-10-29 2020-02-21 北京科技大学 Preparation method of self-fluxing composite pellet
CN110106299B (en) * 2019-05-23 2020-09-15 东北大学 Blast furnace smelting method of vanadium titano-magnetite
CN110229960B (en) * 2019-07-02 2020-12-22 中南大学 Method for preparing magnesium-containing pellets from coarse iron-containing ore
CN112981093A (en) * 2021-02-09 2021-06-18 鞍钢股份有限公司 Magnesium melt type iron coke composite pellet and hot-pressing manufacturing method thereof

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US6120577A (en) * 1998-03-25 2000-09-19 Ltv Steel Company, Inc. Treatment of steel mill waste metal oxides
CN101003852A (en) * 2007-01-18 2007-07-25 东北大学 Method for preparing hot pressed balls of iron ore concentrate and powdered coal
CN101104873A (en) * 2007-07-31 2008-01-16 东北大学 Method for fusing reducing iron by employing iron ore hot pressing carbon-containing agglomerate

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US6120577A (en) * 1998-03-25 2000-09-19 Ltv Steel Company, Inc. Treatment of steel mill waste metal oxides
CN101003852A (en) * 2007-01-18 2007-07-25 东北大学 Method for preparing hot pressed balls of iron ore concentrate and powdered coal
CN101104873A (en) * 2007-07-31 2008-01-16 东北大学 Method for fusing reducing iron by employing iron ore hot pressing carbon-containing agglomerate

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