CN103866118B - Polygeneration system and method for magnetization roasting of refractory iron ore - Google Patents
Polygeneration system and method for magnetization roasting of refractory iron ore Download PDFInfo
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- CN103866118B CN103866118B CN201410089619.4A CN201410089619A CN103866118B CN 103866118 B CN103866118 B CN 103866118B CN 201410089619 A CN201410089619 A CN 201410089619A CN 103866118 B CN103866118 B CN 103866118B
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Abstract
The invention relates to the field of energy chemical and metallurgy engineering and discloses a metallurgical, chemical and power polygeneration system and method for magnetization roasting of refractory iron ore. The method comprises the following steps: carrying out pyrolysis and gasification on partial coal, allowing the gasified and pyrolyzed coal gas to magnetically roast refractory iron ore iron ore in a circulating fluidized bed reactor, dressing the roasted hard-dressing iron ore by magnetic separation to obtain high-grade magnetic iron powder, feeding the magnetite powder into a metallurgical blast furnace for ironmaking; purifying the tail gas obtained from magnetization roasting of hard-dressing iron ore and enabling the tail gas to enter a chemical reactor to produce chemical products; and allowing semi-coke generated from coal pyrolysis to enter coal-fired boilers for power generation by combustion. By building the metallurgical, chemical and power polygeneration system for magnetization roasting of hard-dressing iron ore, the system can complete simultaneously the comprehensive utilization of coal resources and iron ore resources, the efficiency of the whole system is improved and the comprehensive benefits of resources-energy-environment are realized.
Description
Technical field
Patent of the present invention is related to derived energy chemical and metallurgical technology field, particularly to difficulties such as limonite, siderite, bloodstone
The polygenerations systeme of iron ore magnetizing roast and method.
Background technology
The work of ferrous metal Ore Experimental study on ore dressing is the important component part of development China mine and steel and iron industry, right
High speed development China steel and iron industry role is also highly important.In terms of China's ferrous metal Ore resources supplIes, with
The increase of ore extraction amount it is more difficult to the weak-magnetic iron ore of choosing and many iron minerals iron ore proportion are increasing, be selected in
The grade of Ore is gradually reduced, and the mineralogical composition of Ore is also more and more complicated.But, with the development of steel and iron industry, black gold
The technical merit belonging to ore beneficiation improves a lot.The major technique innovating achievement having been used for producing has：The autogenous grinding of iron ore；
Magnetic plant permanent magnetism；The dry grinding dry separation of magnetic iron ore；The closed circuit magnetizing roast of lean hematite ore；With petrochemicals and its
Side-product is the hematite floating agent of raw material；Filtration with steam jet pump intensified Daqu concentrate；Vibratory sluice and eddy flow
The heavy-medium beneficiation equipments such as device；Centrifugal ore separator, spiral concentrator, the fan-shaped smitham gravity treatment such as chute and separating cone set
Standby；The high intensity magnetic separator of various types, Separators and High Tension Separation and application cast stone, rubber, chinlon, fiberglass on preparation equipment
With the wear-resistant materials such as monomer cast nylon and plastics on new materials etc..Obtain also having of better effects through overtesting：Flotation column, spiral chute and many
The various sorting equipment such as gradient magnetic separator, the selectivity of the fine ore magnetization roasting furnace of various types and microgranule embedding cloth hematite
Flocculation sorting etc..The automatization of ore dressing there has also been development progressively.Ferrous metal Ore is selected to carry out ore dressing and smelting various difficulties
The research of golden integrated processes, many has been used for producing.
The technological minerals feature difference of China's iron mine is larger, and the beneficiation research of some iron mines achieves very big breakthrough.But
It is also considerable a part of iron mine, technological minerals feature is complicated, its ore dressing work is still in conceptual phase, and calcining magnetic separation method is
Process conventional beneficiation method to be difficult to sort one of most effectual way of low-grade ferric oxide ore of purification, initially by the U.S., moral
State, Japan and other countries use it for the recycling of iron ore of low ore grade.Conventional magnetizing roast method has：Shaft furnace magnetizing roast,
Rotary kiln magnetizing roast, fluidized bed furnace magnetizing roast.
The rotary kiln that 30 Φ 3.6m × L50m were once had in 1962 in the former Soviet Union processes Krivoi ferric oxide ore
（Bloodstone quartzite）.Nineteen twenty-six, Japanese builds up First bloodstone shaft roasting magneticore-dressing plant in China Anshan, thus occurring
" Anshan type vertical baking furnace ", has carried out technological transformation for several times for many years to it.The sixties is by original 50m3Shaft furnace expands to
l00m3, it is applied to Jiu Gangxuan factory, thus improve the one-hour capacity of shaft furnace.The seventies is by former 50m3Shaft furnace is transformed into and crosses beam type
Shaft furnace, under conditions of not expanding overall dimensions, changes structure in the stove, makes heat size expand 70m to3, one-hour capacity raising 74%,
Heat consumption reduces by 18%.Raw ore and is classified into stove roasting in roasting technique aspect, and constitutes half closed circuit roasting technique using magnetic pulley,
The concentrate response rate can be made to improve.
Anshan Iron and Steel Company's sintering head factory once adopted reduction shaft furnace roaster, carried out Roasting to Anshan lean hematite ore
Burn, produce recent decades, gradual perfection and development, solve the problems, such as the ore dressing of the ferric oxide ore that Anshan iron and steel plant is badly in need of solving, effectively
Process substantial amounts of lean hematite.Jiuquan Iron ＆ Steel Co. ore dressing plant（So far continue to produce）, Baotou Iron and Steel Company ore dressing plant and
Anshan Iron and Steel Company neat Da Shan ore dressing plant is also adopted by calcining magnetic separation process and produces iron ore concentrate, has 20 50m3Shaft roasting white clouds
The lean oxide ore of pile of stones, earth or grass produces more than 10 year, has produced substantial amounts of qualified iron ore concentrate for these iron companies, has effectively met this
The needs of a little iron companies blast fumance.According to statistics, China once had 130 multiple stage shaft furnaces being produced, and year processes ore amount and reaches
More than 1300 ten thousand tons.Because hereafter strong magnetomechanical is succeeded in developing, can with the above-mentioned hematite of effective process, in addition to wine steel, oneself first after
1994（Baogang）And calendar year 2001 stopped production and application.
During the sixties to the seventies, in addition to using reduction shaft furnace roasting, China also dialogue eight street iron ore, village autumn iron mine
Stone and Jiu Gangxuan factory fine ore carry out the research of more than half industrial rotary kiln magnetizing roasts, and select factory seven series to build up one in Baogang
In 3.6 × 50m rotary kiln to Bayan Obo lean oxide ore carried out magnetizing roast commerical test research.Meanwhile, 60 years
In generation, starts the research that China was also carried out fluidization magnetizing roast, and experimental scale reaches 100t/d, and processing Ore is that Anshan iron and steel is public
The Ore of department and Jiuquan Iron ＆ Steel Co. etc..
Although making moderate progress compared with the roasted ore index of the first two type of furnace, but equally exist many asking in boiling roaster
Topic, high energy consumption, roasting high cost, the recovery time is long, and product quality is still undesirable, fluctuation of service, the Technology of roaster
And also thoroughly do not solved, simultaneously because the problems such as furnace type structure, not being applied to work the problems such as some devices and the type of furnace
Industry produces.Comrade Liu Chaoqun of Changsha Ferrous metal mines design and research institute 1979 does fuel and reducing agent to using fine coal
Guangxi collects autumn iron mine（Rotary kiln baking）, Yunnan Ba Jie iron mine（Rotary kiln baking）And Guangxi Aug. 1st manganese ore（Boiling roaster）Enter
The calcining magnetic separation Economic Effect Analysis of Agricultural Techniques of row shows, village autumn iron mine processed the more general iron mine of raw ore ore dressing processing charges per ton at that time
The processing charges of shaft roasting magneticore-dressing plant are high by 50%, are the twices of high intensity magnetic separation processing charges.Therefore, the boiling roaster type of furnace and technique are asked
Topic is not also thoroughly solved, and also needs to study further.The three of the above type of furnace, carries out magnetizing roast to ferric oxide ore,
Because feed preparation unit size is big, heat and mass speed is slow, and roasting is uneven, leads to roasting time long, high energy consumption, roasting high cost.
The present invention is directed to the deficiency of existing refractory iron ore magnetizing roast, in conjunction with the chemical-power multi-combined production of coal resources
Technology it is proposed that a kind of metallurgy of refractory iron ore magnetizing roast, chemical industry and power Poly-generation technology, more than baking tail gases
Heat, the chemical energy of unreacted reducibility gas are comprehensively utilized, and reduce the energy consumption of magnetizing roast process, improve its economy.
Content of the invention
It is an object of the invention to provide a kind of for refractory iron ore carry out magnetizing roast metallurgy, chemical industry and power many
Co-generation system and method, to reduce refractory iron ore magnetizing roast process high energy consumption, improve its economy, realize coal resources and
The comprehensive utilization of iron ore deposit.
The invention provides a kind of metallurgy, chemical industry and power Poly-generation system that coal and iron ore resource are combined utilization
System, this system includes：
（1）Gasification unit：Produce raw gas for coal is carried out partial gasification；
（2）Iron ore magnetizing roast unit：Using gasification unit raw gas in fluid bed to refractory iron ore powder
Carry out magnetizing roast；
（3）Gas heat recovery unit：For the baking tail gases after magnetizing roast to be carried out heat exchange to iron ore, reclaim big
Iron ore is simultaneously preheated by partial baking tail gases sensible heat；
（4）Chemical unit：Gasification gas for reclaiming through gas heat passes through reforming reaction producing synthesis gas, enters
And carry out chemical industry synthesis reaction preparation chemical products；
（5）Semicoke power unit：For by the semicoke after Coal Gasification in gasification unit in coal-burning boiler combustion power generation；
（6）Baking tail gases power unit：The gasification gas reclaiming through gas heat is used for fuel gas as industrial
Combustion gas and urbanite's combustion gas and fuel gas generation；
（7）Metallurgical unit：For the high-grade magnetic iron ore after magnetizing roast-magnetic separation is smelted iron in metallurgy high furnace.
Preferably, described system also includes：Iron ore pretreatment unit, produces ferrum for carrying out pulverizing and jevigating to iron ore
Mineral powder.
Preferably, described system also includes：Gas purification unit, for carrying out purified treatment by the coal gas after Exposure degree
Obtain the gasification gas of cleaning, described purified treatment includes dedusting, washing, removing CO2Operation, wherein, clean gasifying coal gas
Middle CO+H2+CH4>93%.
Preferably, described gasification unit is that coal is gasified in vaporizer at 900-1100 DEG C.
Preferably, iron ore magnetizing roast unit be by raw gas at indoor 650-850 DEG C of roasting with refractory iron ore
There is reduction roasting reaction in powder body, the mean residence time of calcination is 40-60 minute.
The invention provides a kind of metallurgy, chemical industry and power Poly-generation side that coal and iron ore resource are combined utilization
Method, the method includes：
（1）The resource utilization method of iron ore：Size-reduced iron ore powder body sends into whirlwind heat exchanger by feed bin, with fluidisation
After bed baking tail gases out carry out heat exchange, enter in fluidized-bed reactor and carry out magnetizing roast, reacted high-temperature roasting
Ore deposit enters in cooler, and water cooled rear magnetic separation obtains high-grade magnetic iron ore, sends into metallurgy high furnace and is smelted iron.
（2）The resource utilization method of coal：Raw gas produced after partial gasification by coal, sends in fluid bed to iron mine
Stone powder body carries out reduction roasting, and the tail gas after roasting carries out heat exchange to entering stove iron ore, through Exposure degree and clean unit
Make the gasification gas of cleaning, gasification gas feeding chemical reactor is carried out chemical industry synthesis preparation chemical products, or by gas
Change coal gas and be used for fuel gas as industrial fuel gas and urbanite's combustion gas and fuel gas generation；Semicoke after Coal Gasification is sent into
Coal-fired boiler combustion generates electricity, and the tail gas after preparation chemical products is sent into coal-fired boiler combustion and generated electricity, and tail gas removing dust purifies heel row
Empty.
The method have the advantages that coal gas carries out after magnetizing roast reaction through fluid bed, only partly there occurs that reduction is anti-
Should, remain in baking tail gases in substantial amounts of reducibility gas such as CO, H2, CH4Deng reforming reaction producing synthesis gas can be passed through, and enter
And be used for producing chemical products.The calorific value of gasification gas is higher simultaneously, and its calorific value requires to be more than 950Kcal/Nm3, it is a kind of reason
The fuel gas thought, can be used as industrial fuel gas and urbanite's combustion gas as fuel and be used for fuel gas generation.
Metallurgy, chemical industry and the power Poly-generation method that coal and iron ore resource are combined utilization provided by the present invention,
It is suitable to process the lean iron mine that Iron grade is more than 20%, after magnetic separation, iron ore concentrate Iron grade is more than 75% to roasting iron ore powder body, and ferrum returns
Yield is more than 90%.
Compared with prior art, the present invention has the following advantages：
（1）Coal Gasification reaction is reacted with iron ore magnetizing roast and separates, make gasification reaction and iron ore magnetizing roast
Reaction can be carried out under conditions of each optimum, improves magnetizing roast efficiency.
（2）By controlling coal gasification processes, coal is made to be gasified totally under optimal conditions, compared with conventional art,
Not only increase the utilization rate of coal, also can avoid the pollution that unreacted coal particles cause.Control gasification temperature by reasonable,
The calorific value making gasification gas is higher than traditional gasification gas such that it is able to satisfaction, as the needs of fuel gas, further increases
The utilization rate of coal.
（3）By the semicoke after Coal Gasification in gasification unit in coal-burning boiler combustion power generation；To return through gas heat
The gasification gas received passes through reforming reaction producing synthesis gas, then processes the gasification of coal obtaining cleaning through gas purification purification unit
Gas, thus meet the condition carrying out chemical industry synthesis reaction preparation chemical products.Further improve the comprehensive utilization ratio of coal,
Coal overall utilization is made to reach more than 90%.
（4）By controlling time of staying of calcination and calcination temperature so that Fe in iron ore powder body2O3Base
Originally it is completely converted into Fe3O4, it is to avoid the partial reduction that prior art occurs because residence time destribution is wide is not enough and part mistake
The problem of degree reduction, improves magnetizing roast efficiency, and then improves follow-up efficiency of magnetic separation.
Brief description：
The metallurgy of the refractory iron ore magnetizing roast that Fig. 1 provides for the present invention, chemical industry and power polygenerations systeme structure are shown
It is intended to.
The metallurgy of the refractory iron ore magnetizing roast that Fig. 2 provides for the present invention, chemical industry and power polygenerations systeme industry stream
Cheng Tu.
Specific embodiment：
For making the object, technical solutions and advantages of the present invention become apparent from understanding, referring to the drawings, one is entered to the present invention
Step describes in detail.
The metallurgy of the refractory iron ore magnetizing roast that Fig. 1 provides for the present invention, chemical industry and power polygenerations systeme structure are shown
It is intended to, this system includes gasification unit 1, iron ore pretreatment unit 2, iron ore magnetizing roast unit 3, and gas heat reclaims single
Unit 4, gas purification unit 5, chemical unit 6, power unit 7, metallurgical unit 8. wherein power unit includes the combustion of gasification gas
Gas generator unit, also includes the coal fired power generation unit of semicoke.
Wherein gasification unit 1 is used for for coal producing raw gas, and the raw gas that will be obtained in the gasification of gasification furnace interior part
Export to iron ore magnetizing roast unit 3 as reduction roasting gas.Iron ore pretreatment unit 2 is used for iron ore is broken
Comminution carefully produces iron ore powder, and the iron ore powder body being obtained is exported to iron ore magnetizing roast unit 3 as fluid bed magnetic
Change roasting bed.Utilize the raw gas that gasification unit 1 is obtained to iron ore pretreatment unit in iron ore magnetizing roast unit 3
The iron ore powder body that 2 obtain carries out fluidized bed magnetizing roasting process, and refractory iron ore magnetizing roast is magnetic iron ore.Gas heat
Recovery unit 4 is used for the baking tail gases after magnetizing roast that the iron ore powder body that iron ore pretreatment unit 2 is produced is changed
Heat, reclaims most baking tail gases sensible heat and preheats iron ore powder body.Gas purification unit 5 is used for after Exposure degree
Coal gas carries out the gasification gas that purified treatment obtains cleaning.Chemical unit 6 is used for for gasification gas passing through chemical industry reforming reaction system
Take synthesis gas, and then carry out chemical industry synthesis and produce chemical products.Power unit 7 is used for the semicoke after Coal Gasification in coal-fired pot
Combustion power generation in stove, or gasification gas is used as industrial fuel gas and urbanite's combustion gas for fuel gas and combustion gas is sent out
Electricity.Metallurgical unit 8 is used for being smelted iron the high-grade magnetic iron ore after magnetizing roast-magnetic separation in metallurgy high furnace.
The metallurgy of the refractory iron ore magnetizing roast that Fig. 2 provides for the present invention, chemical industry and power polygenerations systeme industry stream
Cheng Tu.Its concrete technology flow process is：Iron ore 1 is treated as iron ore powder body 3 through disintegrating machine 2；Coal 5 is through gas gasification
Stove 6 partial gasification obtains raw gas 7 and semicoke 11；Raw gas 7 is sent into and in fluid bed 8, iron ore powder body 3 is carried out with magnetization also
Former roasting, produces magnetic iron ore 12；Tail gas 9 after roasting preheats to iron ore powder body 3 in whirlwind heat exchanger 4, Jing Guoxian
Enter in cleaner unit 10 after recuperation of heat and carry out gas purification, produce the gasification gas 13 of cleaning；Gasification gas 13 sends into chemical industry list
Unit 16 carries out chemical industry synthesis preparation chemical products, or gasification gas is used for fuel gas as industrial fuel gas and urbanite
Combustion gas and fuel gas generation 17；Semicoke 11 after Coal Gasification sends into coal-burning boiler 14 combustion power generation, and tail gas removing dust purifies 18
After empty；Reacted high temperature magnetic iron ore 12 enters in cooler, and water cooled rear magnetic separation 15 obtains high-grade magnetic iron ore, sends into
Metallurgy high furnace 19 is smelted iron.
Claims (3)
1. a kind of by coal and iron ore resource combine utilization metallurgy, chemical industry and power polygenerations systeme it is characterised in that：Institute
System of stating is formed by with lower unit：
(1) gasification unit：Produce raw gas for coal is carried out partial gasification, its calorific value requires to be more than 950Kcal/Nm3；Institute
Stating gasification unit is that coal is gasified in vaporizer at 900-1100 DEG C；
(2) iron ore magnetizing roast unit：Raw gas using gasification unit is carried out to refractory iron ore powder in fluid bed
Magnetizing roast；Described raw gas carries out after magnetizing roast reaction through fluid bed, only partly there occurs reduction reaction；Iron ore magnetizes
Roasting unit is to occur reduction roasting to react with refractory iron ore powder at indoor 650-850 DEG C of roasting raw gas, roasting
The mean residence time of reaction is 40-60 minute；
(3) gas heat recovery unit：For the baking tail gases after magnetizing roast to be carried out heat exchange to iron ore, reclaim most of
Baking tail gases sensible heat and iron ore is preheated；
(4) gas purification unit, for the coal gas after Exposure degree is carried out the gasification gas that purified treatment obtains cleaning, described
Purified treatment includes dedusting, washing, removing CO2Operation；The clean gasifying coal gas made through gas purification unit is by reproducibility
Gas CO, H2And CH4Composition, wherein, CO+H in clean gasifying coal gas2+CH4>93%；
(5) chemical unit：Gasification gas for reclaiming through gas heat passes through reforming reaction producing synthesis gas, Jin Erjin
Row chemical industry synthesis reaction preparation chemical products；
(6) semicoke power unit：For by the semicoke after Coal Gasification in gasification unit in coal-burning boiler combustion power generation；
(7) baking tail gases power unit：The gasification gas reclaiming through gas heat is used for fuel gas and is used as industrial fuel gas
With urbanite's combustion gas and fuel gas generation；
(8) metallurgical unit：For the high-grade magnetic iron ore after magnetizing roast-magnetic separation is smelted iron in metallurgy high furnace.
2. a kind of by coal and iron ore resource combine utilization metallurgy, chemical industry and power Poly-generation method it is characterised in that：Institute
The method of stating comprises the steps of：
(1) resource utilization method of iron ore：Size-reduced iron ore powder body sends into whirlwind heat exchanger by feed bin, goes out with fluid bed
After the baking tail gases coming carry out heat exchange, enter and in fluidized-bed reactor, carry out magnetizing roast, reacted high-temperature roasting ore deposit row
Enter in cooler, water cooled rear magnetic separation obtains high-grade magnetic iron ore, send into metallurgy high furnace and smelted iron；
(2) resource utilization method of coal：Raw gas produced after partial gasification by coal, sends in fluid bed to iron ore powder
Body carries out magnetizing roast, and calcination temperature is 650-850 DEG C, and the mean residence time of calcination is 40-60 minute, roasting
Tail gas afterwards carries out heat exchange to entering stove iron ore, makes the gas of cleaning through gas heat recovery unit and gas purification unit
Change coal gas, described clean gasification gas is by reducibility gas CO, H2And CH4Composition, wherein, CO+H in clean gasification gas2
+CH4>93%；Gasification gas feeding chemical reactor is carried out chemical industry synthesis preparation chemical products, or gasification gas is used for
Fuel gas is used as industrial fuel gas and urbanite's combustion gas and fuel gas generation；Semicoke after Coal Gasification sends into coal-burning boiler combustion
Burn and generate electricity, the tail gas after preparation chemical products is sent into coal-fired boiler combustion and generated electricity, tail gas removing dust empties after purifying；Wherein, make
Raw gas is taken to be that coal is gasified in vaporizer at 900-1100 DEG C, coal is produced after partial gasification and obtained slightly
Coal gas, its calorific value requires to be more than 950Kcal/Nm3.
3. method as claimed in claim 2 it is characterised in that：The purified treatment of described gas purification unit includes dedusting, washes
Wash, remove CO2Operation.
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| CN104745805A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Whole-grade powdery iron ore magnetizing and roasting process based on three tandem rotary kilns |
| CN104831055A (en) * | 2015-04-17 | 2015-08-12 | 沈阳鑫博工业技术股份有限公司 | Device and method used for realizing powdery iron mineral magnetization treatment and generating steam |
| CN106811595A (en) * | 2017-03-24 | 2017-06-09 | 江苏省冶金设计院有限公司 | The system and method for processing vanadium titano-magnetite |
| CN107365905B (en) * | 2017-07-11 | 2019-03-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore closed circuit shower furnace roasting dry grinding dry separation craft online |
| CN110814359A (en) * | 2019-10-18 | 2020-02-21 | 东北大学 | Method for producing reduced iron powder by using coal gangue through self-heating reduction |
| CN110747014B (en) * | 2019-11-01 | 2024-07-30 | 内蒙古科技大学 | Pyrolysis tar gas coke powder separation coupling iron ore magnetizing roasting reactor and application thereof |
| AU2021361339A1 (en) * | 2020-10-13 | 2023-05-04 | Roundhill IP Pty Ltd | Process of thermally treating minerals and apparatus therefor |
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