CN103866118A - 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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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 relates to derived energy chemical and metallurgical technology field, particularly polygenerations systeme and the method for the refractory iron ore magnetizing roasting such as limonite, spathic iron ore, rhombohedral iron ore.
Background technology
The work of ferrous metal ore Experimental study on ore dressing is the important component part of development China mine and Iron And Steel Industry, is also very important to high speed development China Iron And Steel Industry role.From China's ferrous metal ore resources supplIes, along with the increase of ore extraction amount, the weak-magnetic iron ore of more difficult choosing and many iron minerals iron ore proportion are increasing, and the grade of milling ore declines gradually, and the mineralogical composition of ore is also more and more complicated.But along with the development of Iron And Steel Industry, the state of the art of ferrous metal ore ore dressing improves a lot.For the production of major technique innovating achievement have: the autogenous grinding of iron ore; Magnetic plant permanent magnetism; The dry grinding dry separation of magnetic iron ore; The closed circuit magnetizing roasting of lean hematite ore; Hematite flotation reagent taking petrochemicals and byproduct thereof as raw material; With the filtration of vapor jet pump strengthening flotation concentrate; The heavy-medium beneficiation equipment such as vibratory sluice and swirler; The smitham gravitational separation equipments such as centrifugal separator, spiral concentrator, fan-shaped chute and separating cone; The high intensity magnetic separator of various types, Separators and High Tension Separation and apply wear-resistant material and the plastics on new materials etc. such as cast stone, rubber, polyamide fibre, glass reinforced plastic and monomer cast nylon on preparation equipment.Obtain also having of better effects through overtesting: the various sorting equipments such as flotation column, spiral chute and multi-gradient magnetic separator, the selective flocculation sorting of the fine ore magnetization roasting furnace of various types and particulate embedding cloth hematite etc.The automatization of ore dressing has also had development progressively.Select ferrous metal ore to carry out the research of ore dressing and metallurgical integrated processes to various difficulties, many for the production of.
The technological minerals feature difference of China's iron ore is larger, and the ore dressing research of some iron ores has obtained very large breakthrough.But also considerable a part of iron ore, technological minerals feature complexity, its ore dressing work is still in conceptual phase, calcining magnetic separation method is to process conventional beneficiation method to be difficult to one of most effectual way of the low-grade ferric oxide ore of sorting purification, is used it at first the recycling of iron ore of low ore grade by the U.S., Germany, Japan and other countries.Conventional magnetizing roasting method has: shaft furnace magnetizing roasting, rotary kiln magnetizing roasting, fluidizing furnace magnetizing roasting.
USSR (Union of Soviet Socialist Republics) once had the rotary kiln processing Krivoi ferric oxide ore (rhombohedral iron ore quartz rock) of 30 Φ 3.6m × L50m in 1962.Nineteen twenty-six, Japanese builds up First rhombohedral iron ore shaft roasting magneticore-dressing plant in China Anshan, thereby has occurred " Anshan type vertical roasting furnace ", for many years it has been carried out to technological transformation for several times.The sixties is by original 50m
3shaft furnace expands l00m to
3, be applied to Jiu Gangxuan factory, thereby improved the one-hour capacity of shaft furnace.The seventies is by former 50m
3shaft furnace is transformed into and crosses beam type shaft furnace, is not expanding under the condition of physical dimension, changes structure in the stove, makes heat size expand 70m to
3, one-hour capacity improves 74%, and hear rate reduces by 18%.Sinter process aspect occurs that raw ore classification enters stove roasting, and utilizes magnetic pulley to form half closed circuit sinter process, can make the concentrate rate of recovery improve.
Anshan Iron and Steel Company's sintering head factory once adopted reduction shaft furnace stoving oven, Anshan lean hematite ore is carried out to magnetizing roasting, produce recent decades, gradual perfection and development, solve the ore dressing problem of the ferric oxide ore of Anshan iron and steel plant urgent need solution, effectively processed a large amount of lean hematites.Jiuquan Iron & Steel Co. dressing-works (still continuing so far to produce), Baotou Iron and Steel Company dressing-works and Anshan Iron and Steel Company neat Da Shan dressing-works also adopt calcining magnetic separation process to produce iron ore concentrate, have 20 50m
3the poor oxidized ore of shaft roasting Bayan Obo is produced more than 10 year, for these Iron And Steel Companies have produced a large amount of qualified iron ore concentrates, has effectively met the needs that these Iron And Steel Company's blast furnaces are produced.According to statistics, China once had more than 130 shaft furnace producing, and a year processing ore amount reaches more than 1,300 ten thousand tons.Succeed in developing due to strong magnetic machine after this, can effectively process above-mentioned hematite, except wine steel, oneself has successively stopped production and application in 1994 (Baogang) and calendar year 2001.
During the sixties to the seventies, except adopting reduction shaft furnace roasting, China also dialogue eight street iron ores, village autumn iron ore and Jiu Gangxuan factory fine ore carries out the research of more than half industrial rotary kiln magnetizing roastings, and Baogang select factory's seven series build up one in the rotary kiln of 3.6 × 50m the poor oxidized ore of Bayan Obo was carried out to magnetizing roasting commerical test research.Meanwhile, start China the sixties and also carried out the research of fluidization magnetizing roasting, experimental scale reaches 100t/d, and processing ore is the ore of Anshan Iron and Steel Company and Jiuquan Iron & Steel Co. etc.
Although the roasted ore index compared with the first two type of furnace makes moderate progress, exist equally problems at boiling roaster, energy consumption is high, roasting cost is high, and the recovery time is long, and quality product is still undesirable, fluctuation of service, the problems such as the Technology of stoving oven and some device and the type of furnace are not also solved thoroughly, simultaneously due to problems such as furnace type structures, are not applied to industrial production.The calcining magnetic separation Economic Effect Analysis of Agricultural Techniques that comrade Liu Chaoqun of Changsha Ferrous metal mines design and research institute carries out the Guangxi village autumn iron ore (rotary kiln baking), Yunnan Ba Jie iron ore (rotary kiln baking) and Guangxi Aug. 1st manganese ore (boiling roaster) that use fine coal to do fuel and reductive agent for 1979 shows, collecing at that time autumn iron ore, to process the process cost of the more general iron ore shaft roasting of raw ore ore dressing process cost per ton magneticore-dressing plant high by 50%, is the twice of high intensity magnetic separation process cost.Therefore, the boiling roaster type of furnace and technological problems are not also solved thoroughly, also need further research.Above three kinds of type of furnaces, carry out magnetizing roasting to ferric oxide ore, and because feed preparation unit size is large, heat and mass speed is slow, and roasting is inhomogeneous, causes roasting time long, and energy consumption is high, and roasting cost is high.
The present invention is directed to the deficiency of existing refractory iron ore magnetizing roasting, in conjunction with the chemical-power multi-combined production technology of coal resources, a kind of metallurgy, chemical industry and power Poly-generation technology of refractory iron ore magnetizing roasting have been proposed, waste heat to baking tail gases, the chemical energy of unreacted reducing gas fully utilize, the energy consumption that reduces magnetizing roasting process, improves its economy.
Summary of the invention
The object of the present invention is to provide a kind of metallurgy, chemical industry and power polygenerations systeme and method of carrying out magnetizing roasting for refractory iron ore, high to reduce refractory iron ore magnetizing roasting process energy consumption, improve its economy, realize the comprehensive utilization of coal resources and iron ore deposit.
The invention provides a kind of metallurgy, chemical industry and power polygenerations systeme of coal and iron ore resource being combined to utilization, this system comprises:
(1) gasification unit: produce raw gas for coal is carried out to partial gasification;
(2) iron ore magnetizing roasting unit: adopt the raw gas of gasification unit, in fluidized-bed, refractory iron ore powder is carried out to magnetizing roasting;
(3) gas heat recovery unit: for the baking tail gases after magnetizing roasting is carried out to heat exchange to iron ore, reclaim most baking tail gases sensible heat and by iron ore preheating;
(4) chemical unit: for the gasification gas reclaiming through gas heat is passed through to reforming reaction producing synthesis gas, and then carry out chemical industry building-up reactions and prepare Chemicals;
(5) semicoke power unit: for by the combustion power generation in coal firing boiler of the semicoke after gasification unit gasification of coal;
(6) baking tail gases power unit: the gasification gas reclaiming through gas heat is used as to industrial fuel gas and city resident's combustion gas and fuel gas generation for fuel gas;
(7) metallurgical unit: for the higher-grade magnetite after magnetizing roasting-magnetic separation is smelted iron in metallurgy high furnace.
Preferably, described system also comprises: iron ore pretreatment unit, and for being carried out to pulverizing and jevigating, iron ore produces iron ore powder.
Preferably, described system also comprises: gas purification unit, and to carry out purifying treatment for the coal gas after sensible heat is reclaimed and obtain clean gasification gas, described purifying treatment comprises dedusting, washs, removes CO
2operation, wherein, CO+H in clean gasifying coal gas
2+ CH
4>93%.
Preferably, described gasification unit is that coal is gasified in vaporizer at 900-1100 DEG C.
Preferably, iron ore magnetizing roasting unit is that raw gas is reacted with refractory iron ore powder generation reducing roasting at 650-850 DEG C in roasting chamber, and the mean residence time of calcination is 40-60 minute.
The invention provides a kind of metallurgy, chemical industry and power Poly-generation method of coal and iron ore resource being combined to utilization, the method comprises:
(1) resource utilization method of iron ore: send into whirlwind heat exchanger by feed bin through the iron ore powder of pulverizing, carry out after heat exchange with fluidized-bed baking tail gases out, enter and in fluidized-bed reactor, carry out magnetizing roasting, reacted high-temperature roasting ore deposit enters in water cooler, after water-cooled, magnetic separation obtains high-grade magnetite, sends into metallurgy high furnace and smelts iron.
(2) resource utilization method of coal: coal is produced raw gas after by partial gasification, send in fluidized-bed iron ore powder is carried out to reducing roasting, tail gas after roasting carries out heat exchange to entering stove iron ore, reclaim with clean unit and make clean gasification gas through sensible heat, gasification gas is sent into chemical reactor and carry out the synthetic preparation of chemical industry Chemicals, or gasification gas is used as to industrial fuel gas and city resident's combustion gas and fuel gas generation for fuel gas; Semicoke after gasification of coal is sent into coal-fired boiler combustion generating, and the tail gas after preparation Chemicals is sent into coal-fired boiler combustion generating, and tail gas is emptying after udst separation.
The advantage of the inventive method is that coal gas is after fluidized-bed carries out magnetizing roasting reaction, and only reduction reaction has occurred part, remains at a large amount of reducing gas as CO H in baking tail gases
2, CH
4deng, can pass through reforming reaction producing synthesis gas, and then for the production of Chemicals.The calorific value of gasification gas is higher simultaneously, and its calorific value requires to be greater than 950Kcal/Nm
3, be a kind of desirable fuel gas, can be used as fuel as industrial fuel gas and city resident's combustion gas and for fuel gas generation.
Metallurgy, chemical industry and power Poly-generation method of coal and iron ore resource being combined to utilization provided by the present invention, is suitable for processing the poor iron ore that iron grade is greater than 20%, and roasting iron ore powder is after magnetic separation, and iron ore concentrate iron grade is greater than 75%, and iron recovery is greater than 90%.
Compared with prior art, the present invention has the following advantages:
(1) gasification of coal reaction is reacted and separated with iron ore magnetizing roasting, gasification reaction and iron ore magnetizing roasting reaction can be carried out under optimum separately condition, improve magnetizing roasting efficiency.
(2) by controlling coal gasification processes, coal is gasified totally under the condition of optimizing, compared with conventional art, not only improve the utilization ratio of coal, the pollution that also can avoid unreacted coal particle to cause.By reasonable control gasification temperature, make the calorific value of gasification gas higher than traditional gasification gas, thereby can meet the needs as fuel gas, further improve the utilization ratio of coal.
(3) by the combustion power generation in coal firing boiler of the semicoke after gasification of coal in gasification unit; The gasification gas reclaiming through gas heat is passed through to reforming reaction producing synthesis gas, then processing obtains clean gasification gas through gas purification purification unit, thereby meet the condition that chemical industry building-up reactions is prepared Chemicals of carrying out.Further improve the comprehensive utilization ratio of coal, coal overall utilization is reached more than 90%.
(4) by controlling the residence time and the calcination temperature of calcination, make the Fe in iron ore powder
2o
3substantially be all converted into Fe
3o
4, avoid prior art because the wide partial reduction occurring of residence time distribution is not enough and the problem of part over reduction, improve magnetizing roasting efficiency, and then improve follow-up efficiency of magnetic separation.
Brief description of the drawings:
Fig. 1 is metallurgy, chemical industry and the power polygenerations systeme structural representation of refractory iron ore magnetizing roasting provided by the invention.
Fig. 2 is metallurgy, chemical industry and the power polygenerations systeme industrial flow chart of refractory iron ore magnetizing roasting provided by the invention.
Embodiment:
In order to make, the object, technical solutions and advantages of the present invention are more clear to be understood, referring to accompanying drawing, the present invention is described in more detail.
Fig. 1 is metallurgy, chemical industry and the power polygenerations systeme structural representation of refractory iron ore magnetizing roasting provided by the invention, this system comprises gasification unit 1, iron ore pretreatment unit 2, iron ore magnetizing roasting unit 3, gas heat recovery unit 4, gas purification unit 5, chemical unit 6, power unit 7, metallurgical unit 8. wherein power unit comprises the fuel gas generation unit of gasification gas, also comprises the coal fired power generation unit of semicoke.
Wherein gasification unit 1 is for coal part vaporizing system in vapourizing furnace is got to raw gas, and the raw gas making is exported to iron ore magnetizing roasting unit 3 as reducing roasting gas.Iron ore pretreatment unit 2 is produced iron ore powder for iron ore is carried out to pulverizing and jevigating, and the iron ore powder making is exported to iron ore magnetizing roasting unit 3 as fluidized bed magnetizing roasting bed material.Interiorly in iron ore magnetizing roasting unit 3 utilizing the iron ore powder that raw gas that gasification unit 1 makes obtains iron ore pretreatment unit 2 to carry out fluidized bed magnetizing roasting processing, is magnetite by refractory iron ore magnetizing roasting.Gas heat recovery unit 4 carries out heat exchange for the iron ore powder that the baking tail gases after magnetizing roasting is produced iron ore pretreatment unit 2, reclaims most baking tail gases sensible heat and by the preheating of iron ore powder.Gas purification unit 5 carries out purifying treatment for the coal gas after sensible heat is reclaimed and obtains clean gasification gas.Chemical unit 6 for by gasification gas by chemical industry reforming reaction producing synthesis gas, and then carry out the synthetic production chemical product of chemical industry.Power unit 7 is for by the combustion power generation in coal firing boiler of the semicoke after gasification of coal, or gasification gas for fuel gas as industrial fuel gas and city resident's combustion gas and fuel gas generation.Metallurgical unit 8 for smelting iron the higher-grade magnetite after magnetizing roasting-magnetic separation in metallurgy high furnace.
Fig. 2 is metallurgy, chemical industry and the power polygenerations systeme industrial flow chart of refractory iron ore magnetizing roasting provided by the invention.Its concrete technology flow process is: iron ore 1 is treated as iron ore powder 3 through crusher 2; Coal 5 obtains raw gas 7 and semicoke 11 through gas gasification stove 6 partial gasifications; Raw gas 7 is sent into fluidized-bed 8 is interior carries out Magnetization reductive roasting to iron ore powder 3, produced magnetite 12; Tail gas 9 after roasting carries out preheating to iron ore powder 3 whirlwind heat exchanger 4 is interior, after sensible heat reclaims, enters in fly-ash separator 10 and carries out gas purification, produces clean gasification gas 13; Gasification gas 13 is sent into chemical unit 16 and is carried out the synthetic preparation of chemical industry Chemicals, or gasification gas is used as to industrial fuel gas and city resident's combustion gas and fuel gas generation 17 for fuel gas; Semicoke 11 after gasification of coal is sent into coal firing boiler 14 combustion power generations, and tail gas is emptying after udst separation 18; Reacted high-temp magnetic iron ore 12 enters in water cooler, and after water-cooled, magnetic separation 15 obtains high-grade magnetite, sends into metallurgy high furnace 19 and smelts iron.
Claims (10)
1. metallurgy, chemical industry and a power polygenerations systeme of coal and iron ore resource being combined to utilization, is characterized in that: described system is by forming with lower unit:
(1) gasification unit: produce raw gas for coal is carried out to partial gasification;
(2) iron ore magnetizing roasting unit: adopt the raw gas of gasification unit, in fluidized-bed, refractory iron ore powder is carried out to magnetizing roasting;
(3) gas heat recovery unit: for the baking tail gases after magnetizing roasting is carried out to heat exchange to iron ore, reclaim most baking tail gases sensible heat and by iron ore preheating;
(4) chemical unit: for the gasification gas reclaiming through gas heat is passed through to reforming reaction producing synthesis gas, and then carry out chemical industry building-up reactions and prepare Chemicals;
(5) semicoke power unit: for by the combustion power generation in coal firing boiler of the semicoke after gasification unit gasification of coal;
(6) baking tail gases power unit: the gasification gas reclaiming through gas heat is used as to industrial fuel gas and city resident's combustion gas and fuel gas generation for fuel gas;
(7) metallurgical unit: for the higher-grade magnetite after magnetizing roasting-magnetic separation is smelted iron in metallurgy high furnace.
2. the system as claimed in claim 1, is characterized in that: described gasification unit is that coal is gasified in vaporizer at 900-1100 DEG C.
3. the system as claimed in claim 1, is characterized in that: the raw gas that coal is produced after by partial gasification, its calorific value requires to be greater than 950Kcal/Nm
3, described raw gas is after fluidized-bed carries out magnetizing roasting reaction, and there is reduction reaction in part only.
4. the system as claimed in claim 1, is characterized in that: iron ore magnetizing roasting unit is that raw gas is reacted with refractory iron ore powder generation reducing roasting at 650-850 DEG C in roasting chamber, and the mean residence time of calcination is 40-60 minute.
5. the system as claimed in claim 1, is characterized in that: described system also comprises: gas purification unit, and to carry out purifying treatment for the coal gas after sensible heat is reclaimed and obtain clean gasification gas, described purifying treatment comprises dedusting, washs, removes CO
2operation.
6. system as claimed in claim 5, is characterized in that: the clean gasifying coal gas of making through gas purification unit is by reducing gas CO, H
2and CH
4composition, wherein, CO+H in clean gasifying coal gas
2+ CH
4>93%.
7. metallurgy, chemical industry and a power Poly-generation method of coal and iron ore resource being combined to utilization, is characterized in that: described method is made up of following steps:
(1) resource utilization method of iron ore: send into whirlwind heat exchanger by feed bin through the iron ore powder of pulverizing, carry out after heat exchange with fluidized-bed baking tail gases out, enter and in fluidized-bed reactor, carry out magnetizing roasting, reacted high-temperature roasting ore deposit enters in water cooler, after water-cooled, magnetic separation obtains high-grade magnetite, sends into metallurgy high furnace and smelts iron;
(2) resource utilization method of coal: coal is produced raw gas after by partial gasification, send in fluidized-bed iron ore powder is carried out to reducing roasting, tail gas after roasting carries out heat exchange to entering stove iron ore, make clean gasification gas through gas heat recovery unit and gas purification unit, gasification gas is sent into chemical reactor and carry out the synthetic preparation of chemical industry Chemicals, or gasification gas is used as to industrial fuel gas and city resident's combustion gas and fuel gas generation for fuel gas; Semicoke after gasification of coal is sent into coal-fired boiler combustion generating, and the tail gas after preparation Chemicals is sent into coal-fired boiler combustion generating, and tail gas is emptying after udst separation.
8. method as claimed in claim 7, is characterized in that: producing raw gas is that coal is gasified in vaporizer at 900-1100 DEG C, and coal is produced after by partial gasification and obtained raw gas, and its calorific value requires to be greater than 950Kcal/Nm
3.
9. method as claimed in claim 7, is characterized in that: iron ore magnetizing roasting unit is that raw gas is reacted with refractory iron ore powder generation reducing roasting at 650-850 DEG C in roasting chamber, and the mean residence time of calcination is 40-60 minute.
10. method as claimed in claim 7, is characterized in that: the purifying treatment of described gas purification unit comprises dedusting, washs, removes CO
2operation, the clean gasifying coal gas of making through clean unit is by reducing gas CO, H
2and CH
4composition, wherein, CO+H in clean gasifying coal gas
2+ CH
4>93%.
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| 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 |
| CN107365905A (en) * | 2017-07-11 | 2017-11-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore 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 |
| WO2022077062A1 (en) * | 2020-10-13 | 2022-04-21 | Roundhill IP Pty Ltd | Process of thermally treating minerals and apparatus therefor |
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| CN107365905A (en) * | 2017-07-11 | 2017-11-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore online |
| 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 |
| WO2022077062A1 (en) * | 2020-10-13 | 2022-04-21 | Roundhill IP Pty Ltd | Process of thermally treating minerals and apparatus therefor |
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