CN106011457A - Magnetizing roasting system and technology of iron ore powder difficult to beneficiate - Google Patents
Magnetizing roasting system and technology of iron ore powder difficult to beneficiate Download PDFInfo
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- CN106011457A CN106011457A CN201610557608.3A CN201610557608A CN106011457A CN 106011457 A CN106011457 A CN 106011457A CN 201610557608 A CN201610557608 A CN 201610557608A CN 106011457 A CN106011457 A CN 106011457A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/10—Roasting processes in fluidised form
Abstract
The invention discloses a magnetizing roasting system and technology of iron ore powder difficult to beneficiate, and belongs to the technical fields of metallurgy and mineral engineering. According to the magnetizing roasting system and the magnetizing roasting technology, magnetizing roasting is carried out on the iron ore powder through adopting a circulating fluidized bed reactor, sensible heat of roasting tail gas is recycled through preheating gas through an indirect heat exchanger, then, thorough purification treatment is carried out on the roasting tail gas through a wet dust collector and a dehydrater, the roasting tail gas subjected to thorough purification treatment is fed into a combustion chamber as a heat source, and the phenomenon that the combustion chamber has incrustations due to fact that roasting tail gas brings in dust is prevented; and the sensible heat of roasted iron ore powder is recycled through the manners that the high-temperature roasted iron ore powder and cold roasted tail gas exchange heat in a cyclone cooler and combustion-supporting air is preheated, the sensible heat of the high-temperature roastted iron ore powder is utilized more reasonably and fully, and the purposes that iron ore powder is quickly magnetized and roasted, and the heat utilization rate during the roasting process is high are achieved.
Description
Technical field
The invention belongs to metallurgical and mineral engineering technology field, be specifically related to a kind of system and magnetic roasting process using circulating fluid bed reactor that refractory iron ore stone powder carries out magnetizing roast.
Background technology
China's iron ore resource enriches, and explored reserves reach more than 700 hundred million tons, occupy the 5th, the world, but its natural endowment is poor, mainly showing themselves in that (1) " lean ", in explored reserves, more than 97% is lean iron mine, average grade is only 32%, lower by about 11% than world average grade；(2) " miscellaneous ", accompanying element is many altogether, and including vanadium, titanium, copper, cobalt, nickel, chromium, rare earth, niobium and fluorine, and the economic worth being total to accompanying element is often higher than ferrum；(3) iron mine that " carefully ", disseminated grain size is thin and fine account for greatly.Therefore, the iron ore deposit of China is required for be utilized for subsequent technique by beneficiation enrichment substantially, but the Refractory iron ore stone resource that the physical upgrading methods such as normal reselection, magnetic separation, flotation such as limonite, siderite, appositional pattern bloodstone are difficult to effectively sort accounts for China and has verified the 40% of iron ore resource, this current resources situation determines China and only realizes effective utilization of these refractory iron ore resources, could expand China can industrial utilization iron ore resource amount, reduce external dependence degree, ensure the lasting supply of China's iron ore.
In the decades in past, the scientific worker of China has carried out long-term research to refractory iron ore resource utilization issue, especially having carried out systematic research and exploitation to by magnetic roasting process process refractory iron ore, iron ore magnetic roasting process mainly has shaft furnace magnetic roasting process and rotary kiln magnetic roasting process the most both at home and abroad.
Shaft furnace magnetic roasting process is mainly for the treatment of lump ore (entering stove grade 15-100mm), and its subject matter existed has: the ore grain size handled by (1) is big, surface area is little, with reducing agent (CO and H2Deng) contact less, reduction process is slow；(2), in actual production, higher than inside, there is the phenomenon that top layer is uneven with internal reduction, and lump ore granularity be bigger in lump ore top layer reduction degree, reduction non-uniform phenomenon is the most serious；(3) owing to entering the inhomogeneities of stove lump ore granularity, little grade lump ore entirety crosses reduction, and big grade lump ore entirety owes reduction.It is big that these problems directly result in shaft roasting energy consumption, and roasted ore technical specification is poor, production cost high.
Rotary kiln magnetic roasting process is used for processing the iron ore that stove grade is below 25mm (general control is at 0-12mm), its technical specification is better than shaft furnace, but there is also that ore reduction is uneven, roasting high in cost of production problem, particularly rotary kiln tail end frequently occurs ring formation phenomenon, difficulty persistently produces.
Iron ore fluidization magnetizing roast technology is compared with traditional rotary kiln magnetizing roast technology; its maximum difference is that original accumulation state gas-particle heat transfer, mass transfer mode are changed into fluidization heat transfer, mass transfer; gas-solid makes material form turbulence state by fluid bed; after preheater; turbulent flow is formed under cyclone cylinder Tangential Wind power effect; its advantage of mass transport process under gas phase fluidization state is: under (1) fluidized state, gas-particle two-phase contact area is big, and heat transfer, mass transfer and granule chemical reaction velocity are very fast；(2) fluidisation warm-up cycle fluid bed is the counter-flow heat exchanger being in series from top to bottom by Multi-stage airflow unit, and material turbulivity is high, and between gas-solid, the temperature difference and reducing atmosphere concentration difference are relatively big, and comprehensive carry-over factor and transmission power are bigger.
Chinese invention patent application 201010621731.X discloses system and the roasting technique of a kind of refractory iron ore stone powder magnetizing roast, and this invention is to use circulating fluid bed reactor that iron ore powder is carried out magnetizing roast；Baking tail gases first discharges the latent heat of wherein unreacting gas in a combustion chamber by burning, then reclaims latent heat by mulitistage cyclone with chill mineral powder heat exchange；In cooling cyclone, the sensible heat of high-temperature roasting iron ore powder by the way of heat exchange, is reclaimed by cooled coal gas and high-temperature roasting iron ore powder.The shortcoming of this technical scheme, one be the baking tail gases not being fully cleaned up in combustion chambers burn, owing to bringing into of dust easily causes combustor dross；Two is to reclaim sensible heat only by cooled coal gas and high-temperature roasting iron ore powder mode of heat exchange in cooling cyclone, high-temperature roasting ore deposit shows pick up the heat abundant and the most abundant to the sensible heat utilization of baking tail gases not.
Summary of the invention
It is an object of the invention to the technical problem existed based on 201010621731.X, it is provided that a kind of refractory iron ore stone powder magnetizing roast system, it is possible to prevent combustor dross and make the magnetizing roast of refractory iron ore stone powder more efficient, energy-conservation.
It is a further object of the present invention to provide the technique utilizing said system to carry out refractory iron ore stone powder magnetizing roast.
It is an object of the invention to realize in the following way: enter back into combustor after baking tail gases being carried out thorough purified treatment by wet scrubber, dehydrator and utilize, reduce the dust content in baking tail gases, the problem solving combustor dross；By the way of high-temperature roasting iron ore powder warm-up combustion-supporting air, reclaim the sensible heat of roasting iron ore powder, make roasting iron ore powder sensible heat utilization the most reasonable, fully；The sensible heat of baking tail gases is reclaimed via indirect heat exchanger preheating gas, to improve the utilization rate of fuel by baking tail gases.
The refractory iron ore stone powder magnetic roasting process system of the present invention, main by feed bin, mulitistage cyclone, gravitational precipitator, sack cleaner, auger conveyor, combustor, feeder, by riser, primary cyclone, the circulating fluid bed reactor that dipleg and secondary cyclone are constituted, multistage cyclone cooler, cyclone dust extractor, spiral discharging device, indirect air cooling fluid bed, aerator, by gas change heater, the indirect heat exchanger that baking tail gases heat exchanger is constituted, wet scrubber, dehydrator, purify baking tail gases pressuring machine, gas compressor, air-introduced machine and chimney combine；
Described mulitistage cyclone is made up of one cyclonic preheater, two grades of cyclone preheaters and three grades of cyclone preheaters；The discharge outlet of bin bottom is provided with the pipeline that the air inlet with one cyclonic preheater is connected, the gas outlet at one cyclonic preheater top is connected with the air inlet of gravitational precipitator, and discharging opening and the air inlet of two grades of cyclone preheaters bottom one cyclonic preheater are connected；
The gas outlet of gravitational precipitator is connected with the air inlet of sack cleaner, and the discharging opening of gravitational precipitator bottom is connected with feeder；
The gas outlet of sack cleaner is connected with the air inlet of air-introduced machine, and air-introduced machine gas outlet is connected with chimney；
The bottom of sack cleaner is provided with auger conveyor, and the discharging opening of auger conveyor is connected with feeder；The discharging opening of feeder is connected with the charging aperture of riser；
The gas outlet at two grades of cyclone preheater tops is connected with the air inlet of one cyclonic preheater, and discharging opening and the air inlet of three grades of cyclone preheaters bottom two grades of cyclone preheaters are connected；Discharging opening bottom three grades of cyclone preheaters is connected with the charging aperture of riser, and the gas outlet at three grades of cyclone preheater tops is connected with the air inlet of two grades of cyclone preheaters, and the air inlet of three grades of cyclone preheaters is connected with the gas outlet of combustor；
The air inlet of combustor has the pipeline being connected with indirect air cooling fluid bed, gas change heater and baking tail gases heat exchanger respectively；
The bottom of riser is provided with air inlet, this air inlet is connected with the gas outlet of cyclone dust extractor, riser bottom is provided with three charging apertures, discharging opening with discharging opening, the discharging opening of feeder and dipleg bottom bottom three grades of cyclone preheaters is connected respectively, and the gas outlet that the top of riser is provided with is connected with the air inlet of primary cyclone；
The bottom of primary cyclone is connected with the top of dipleg, and the gas outlet of primary cyclone is connected with the air inlet of secondary cyclone；The discharging opening of secondary cyclone bottom is connected with the charging aperture of dipleg；
Dipleg bottom has two discharging openings, a discharging opening to be connected with a charging aperture of riser bottom, and another discharging opening is connected with the air inlet of the one cyclonic cooler constituting cooling cyclone；
Cooling cyclone is made up of one cyclonic cooler and two grades of cooling cyclones；Wherein: the gas outlet of one cyclonic cooler is connected with the air inlet of cyclone dust extractor；The air inlet of two grades of cooling cyclones is connected with the discharging opening of one cyclonic cooler bottom and the gas outlet of purification baking tail gases pressuring machine respectively, the gas outlet at the top of two grades of cooling cyclones is connected with the air inlet of one cyclonic cooler, and the discharging opening of two grades of cooling cyclones is connected with the charging aperture of spiral discharging device；The discharging opening of cyclone dust extractor bottom is also connected with the charging aperture of spiral discharging device；
The gas outlet at secondary cyclone top is connected with the indirect heat exchanger air inlet being made up of gas change heater and baking tail gases heat exchanger, indirect heat exchanger gas outlet is connected with wet scrubber air inlet, the gas outlet at wet scrubber top is connected with dehydrator air inlet, the gas outlet at dehydrator top is connected with the air inlet purifying baking tail gases pressuring machine, two arms are divided in the gas outlet purifying baking tail gases pressuring machine, one of them arm is connected with baking tail gases heat exchanger air inlet, another arm is connected with the air inlet of indirect air cooling fluid bed bottom and the air inlet of two grades of cooling cyclones；The air inlet of gas change heater is connected with the gas outlet of gas compressor；
The gas outlet on indirect air cooling fluid bed top is connected with the air inlet of circulating fluid bed reactor riser；The air inlet of indirect air cooling fluid bed is connected with the gas outlet of aerator；The discharging opening of spiral discharging device is connected with indirect air cooling fluid bed charging aperture；All it is connected by pipeline between each position of above-mentioned each device.
The discharging opening of described indirect air cooling fluid bed is connected with follow-up magnetic separation system by slime dam, it is achieved that with the slitless connection of magnetic separation system；Discharging opening bottom wet scrubber is connected with slime dam by pipeline with the discharging opening bottom dehydrator.
The pipeline of gas outlet, described indirect air cooling fluid bed top is provided with oxygen content detection alarm, the air comb generation leakage accident being possible to prevent in indirect air cooling fluid bed.
The technique that the present invention utilizes above-mentioned refractory iron ore stone powder magnetic roasting process system to carry out refractory iron ore stone powder magnetizing roast is: iron ore powder is sequentially sent to one cyclonic preheater, two grades of cyclone preheaters, three grades of cyclone preheaters from feed bin, after completing heat exchange with combustor tail gas out in three grades of cyclone preheaters, the riser of iron ore powder entrance circulating fluid bed reactor carries out magnetizing roast；Being entered dedusting in sack cleaner after gravitational precipitator by the iron ore powder carried secretly in the gas outlet expellant gas of one cyclonic preheater, the iron ore powder of gravitational precipitator and sack cleaner collection enters via feeder in the riser of circulating fluid bed reactor；High temperature magnetization baking tail gases is discharged by the gas outlet of circulating fluid bed reactor riser, indirect heat exchanger is entered through cyclone separator, magnetizing roast tail gas through indirect heat exchanger cooling, enter wet scrubber and carry out dedusting, again after dehydrator is dehydrated, purified baking tail gases pressuring machine pressurizes, and enters combustor；Magnetizing roast reacted high-temperature roasting iron ore powder is discharged by the dipleg of circulating fluid bed reactor, heat exchange is carried out to reclaim the sensible heat of high-temperature roasting iron ore powder with purification baking tail gases again in cooling cyclone, roasting iron ore powder is tentatively cooled down, and purifies baking tail gases and is heated；The roasting iron ore powder tentatively cooled down subsequently enters indirect air cooling fluid bed, carries out sending into follow-up magnetic separation system by slime dam after heat exchange is cooled with purifying baking tail gases.
In above-mentioned magnetic roasting process, purify baking tail gases to blast from indirect air cooling fluid bed bottom, roasting breeze is made to suspend, heat exchange is carried out with air comb, after the air introduced by aerator is heated to 300-400 DEG C by the air comb of indirect air cooling fluid bed, deliver to combustor as combustion air, to reduce the energy consumption of magnetizing roast.
Described baking tail gases is after the secondary cyclone gas outlet of circulating fluid bed reactor is discharged, enter indirect heat exchanger, the coal gas introduced by gas compressor, after gas change heater is heated to 400-500 DEG C, respectively enters recirculating fluidized bed and combustor as reducing gas and thermal source；Purify and enter combustor as thermal source after the fired tail gas heat exchanger of baking tail gases is heated to 300-400 DEG C.So on the one hand, the high temperature reduction waste gas residual heat discharged from circulating fluid bed reactor can be made full use of, reduce system energy consumption；On the other hand combustor is delivered to after being heated by baking tail gases, it is possible to decrease the combustible component content in the tail gas discharged during fluidized bed magnetizing roasting.
The present invention uses circulating fluid bed reactor that iron ore powder carries out magnetizing roast, is then sent through combustor as thermal source, solves the problem that the dust brought in baking tail gases causes combustor dross after baking tail gases removing dust device dedusting, dehydrator dehydration；By the way of high-temperature roasting iron ore powder warm-up combustion-supporting air, reclaim the sensible heat of roasting iron ore powder, make roasting iron ore powder sensible heat utilization the most reasonable, fully；Reclaimed the sensible heat of baking tail gases by baking tail gases via indirect heat exchanger preheating gas, improve the utilization rate of fuel.
Accompanying drawing explanation
Fig. 1 is that the circulating fluid bed reactor that uses of the present invention carries out system and the process flow diagram of refractory iron ore stone powder magnetizing roast.
Reference: 1, feed bin；2, one cyclonic preheater；3, two grades of cyclone preheaters；4, three grades of cyclone preheaters；5, combustor；6, feeder；7, circulating fluid bed reactor: 7-1, riser, 7-2, primary cyclone, 7-3, dipleg, 7-4, secondary cyclone；8, two grades of cooling cyclones；9, one cyclonic cooler；10, cyclone dust extractor；11, indirect heat exchanger: 11-1, gas change heater, 11-2, baking tail gases heat exchanger；12, wet scrubber；13, dehydrator；14, baking tail gases pressuring machine is purified；15, spiral discharging device；16, oxygen content detection alarm；17, indirect air cooling fluid bed；18, aerator；19, slime dam；20, gravitational precipitator；21, sack cleaner；22, auger conveyor；23, air-introduced machine；24, chimney；25, gas compressor.
Detailed description of the invention
In order to be more fully understood that the present invention, the invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
As shown in Figure 1, iron ore powder (particle diameter 0.074 about mm) after pulverizing is after feed bin 1 is sent into one cyclonic preheater 3, three grades of cyclone preheaters 4 of 2, two grades of cyclone preheaters and completed heat exchange with combustor 5 tail gas out, the discharging opening bottom three grades of cyclone preheaters 4 pipeline being connected with circulating fluid bed reactor 7 enters riser 7-1 and carries out magnetizing roast reaction；The iron ore dust carried secretly from the gas outlet expellant gas of one cyclonic preheater 2, enters dedusting in sack cleaner 21 after gravitational precipitator 20；What sack cleaner 21 was collected is discharged, by gravitational precipitator 20 gas outlet, the iron ore dust carried secretly in gas, and after being discharged by auger conveyor 22, the iron ore powder collected with gravitational precipitator 20 mixes, and enters riser 7-1 through feeder 6 and carries out magnetizing roast；High-temperature roasting breeze after magnetizing roast is discharged into the air inlet of one cyclonic cooler 9 by the discharging opening of circulating fluid bed reactor 7 dipleg 7-3 bottom, the sensible heat reclaiming high-temperature roasting breeze is mixed with the baking tail gases discharged from two grades of cooling cyclone 8 gas outlets, after roasting breeze cools down in one cyclonic cooler 9, discharging opening from one cyclonic cooler 9 bottom is discharged, then the air inlet of two grades of cooling cyclones 8 is entered back into, and carry out heat exchange with from purifying to enter in two grades of cooling cyclones 8 together with baking tail gases pressuring machine 14 purification baking tail gases out, roasted ore pruinescence tentatively cools down, purification baking tail gases is heated；The roasting breeze tentatively cooled down discharging opening from two grades of cooling cyclone 8 bottoms subsequently is entered indirect air cooling fluid bed 17 by the charging aperture of spiral discharging device 15 after discharging；The baking tail gases that purifies of preheating is collected the fine powder of roasting Iron Ore Powder the discharging opening discharge from its underpart by cyclone dust extractor 10, and entered in indirect air cooling fluid bed 17 by spiral discharging device 15, roasting breeze after cooling enters slime dam 19 and makes ore pulp, and ore pulp delivers to follow-up magnetic separation system again.
(using CO as effective ingredient, calorific value is 3500kJ/Nm to blast furnace gas3) enter into after gas compressor 25 press compression in gas change heater 11-1 with from gas outlet, circulating fluid bed reactor 7 secondary cyclone 7-4 top discharge baking tail gases carry out heat exchange, the coal gas being preheating to 400-500 DEG C is then sent through circulating fluid bed reactor 7, combustor 5 utilizes；nullDeliver to after baking tail gases purified baking tail gases pressuring machine 14 pressurization after purification be carried out heat exchange by air inlet two grades of cooling cyclones 8 of entrance of two grades of cooling cyclones 8 after the roasting iron ore powder that the discharging opening of one cyclonic cooler 9 discharges with it mixes，One cyclonic cooler 9 is entered after two grades of cooling cyclone 8 gas outlets are discharged，Enter in one cyclonic cooler 9 after mixing with the high-temperature roasting iron ore powder discharged from dipleg 7-3 and carry out heat exchange，Cyclone dust extractor 10 is entered after one cyclonic cooler 9 gas outlet is discharged，The air inlet bottom riser 7-1 is entered by gas outlet, cyclone dust extractor 10 top after being discharged，After circulating fluid bed reactor 7 riser 7-1 reacts with iron ore powder generation magnetizing roast，Baking tail gases enters the iron ore powder that primary cyclone 7-2 pre-separation is carried secretly，Then discharged by the gas outlet of primary separator 7-2，Enter secondary cyclone 7-4 and separate the iron ore powder carried secretly further，Baking tail gases is discharged by the gas outlet of secondary cyclone 7-4 afterwards，Through gas change heater 11-1 and go back baking tail gases heat exchanger 11-2 cooling、Wet scrubber 12 dedusting、Dehydrator 13 is dehydrated，After purifying baking tail gases pressuring machine 14，A part is through one cyclonic cooler 9、Enter circulating fluid bed reactor 7 after two grades of cooling cyclones 8 and cyclone dust extractor to utilize，Another part utilizes also into circulating fluid bed reactor 7 after indirect air cooling fluid bed 17 is preheating to 300-400 DEG C，The pipeline of gas outlet, indirect air cooling fluid bed 17 top is provided with oxygen content detection alarm 16，The air comb leakage phenomenon in indirect air cooling fluid bed 17 can be monitored.nullGive gas outward and pressurize through gas compressor 25、After gas change heater 11 preheating，It is partly in circulating fluid bed reactor 7 and utilizes，Another part enters the pipeline being connected with the air inlet of combustor 5，And with preheating after baking tail gases and introduce through aerator 18、Purified baking tail gases is preheating to the combustion air of 300-400 DEG C in air cooling fluid bed 17 and enters into together in combustor 5，Combustion tail gas enters the air inlet of three grades of cyclone preheaters 4 from the gas outlet of combustor 5，And enter in three grades of cyclone preheaters 4 after heat exchange together with the iron ore powder discharged with the discharging opening bottom two grades of cyclone preheaters 3，Discharge from the gas outlet of three grades of cyclone preheaters 4，Enter in two grades of cyclone preheaters 3 after heat exchange together with the iron ore powder discharged from one cyclonic preheater bottom discharge mouth，Discharge from the gas outlet of two grades of cyclone preheaters 3，Enter in one cyclonic preheater 2 together with from feed bin 1 chill mineral powder out，And with chill mineral powder in one cyclonic preheater 2 after heat exchange，Discharge from the gas outlet of one cyclonic preheater 2，Entered in gravitational precipitator 20 by the air inlet of gravitational precipitator 20 again，In gravitational precipitator 20 after dedusting，Discharge from the gas outlet of gravitational precipitator 20，Enter and sack cleaner 21 continues dedusting，Air-introduced machine 23 is entered by sack cleaner 21 after being discharged，Introduced chimney 24 by air-introduced machine 23 and enter air.
Claims (6)
1. a refractory iron ore stone powder magnetizing roast system, mainly by feed bin, mulitistage cyclone, gravitational precipitator, sack cleaner, auger conveyor, combustor, feeder, the circulating fluid bed reactor being made up of riser, primary cyclone, dipleg and secondary cyclone, multistage cyclone cooler, cyclone dust extractor, spiral discharging device, gas compressor, air-introduced machine and chimney combine；It is characterized in that: this magnetizing roast system also includes indirect air cooling fluid bed, aerator, the indirect heat exchanger being made up of gas change heater, baking tail gases heat exchanger, wet scrubber, dehydrator and purification baking tail gases pressuring machine；
Described mulitistage cyclone is made up of one cyclonic preheater, two grades of cyclone preheaters and three grades of cyclone preheaters；The discharge outlet of bin bottom is provided with the pipeline that the air inlet with one cyclonic preheater is connected, the gas outlet at one cyclonic preheater top is connected with the air inlet of gravitational precipitator, and discharging opening and the air inlet of two grades of cyclone preheaters bottom one cyclonic preheater are connected；
The gas outlet of gravitational precipitator is connected with the air inlet of sack cleaner, and the discharging opening of gravitational precipitator bottom is connected with feeder；
The gas outlet of sack cleaner is connected with the air inlet of air-introduced machine, and air-introduced machine gas outlet is connected with chimney；
The bottom of sack cleaner is provided with auger conveyor, and the discharging opening of auger conveyor is connected with feeder；The discharging opening of feeder is connected with the charging aperture of riser；
The gas outlet at two grades of cyclone preheater tops is connected with the air inlet of one cyclonic preheater, and discharging opening and the air inlet of three grades of cyclone preheaters bottom two grades of cyclone preheaters are connected；Discharging opening bottom three grades of cyclone preheaters is connected with the charging aperture of riser, and the gas outlet at three grades of cyclone preheater tops is connected with the air inlet of two grades of cyclone preheaters, and the air inlet of three grades of cyclone preheaters is connected with the gas outlet of combustor；
The air inlet of combustor has the pipeline being connected with indirect air cooling fluid bed, gas change heater and baking tail gases heat exchanger respectively；
The bottom of riser is provided with air inlet, this air inlet is connected with the gas outlet of cyclone dust extractor, riser bottom is provided with three charging apertures, discharging opening with discharging opening, the discharging opening of feeder and dipleg bottom bottom three grades of cyclone preheaters is connected respectively, and the gas outlet that the top of riser is provided with is connected with the air inlet of primary cyclone；
The bottom of primary cyclone is connected with the top of dipleg, and the gas outlet of primary cyclone is connected with the air inlet of secondary cyclone；The discharging opening of secondary cyclone bottom is connected with the charging aperture of dipleg；
Dipleg bottom has two discharging openings, a discharging opening to be connected with a charging aperture of riser bottom, and another discharging opening is connected with the air inlet of the one cyclonic cooler constituting cooling cyclone；
Cooling cyclone is made up of one cyclonic cooler and two grades of cooling cyclones；Wherein: the gas outlet of one cyclonic cooler is connected with the air inlet of cyclone dust extractor；The air inlet of two grades of cooling cyclones is connected with the discharging opening of one cyclonic cooler bottom and the gas outlet of purification baking tail gases pressuring machine respectively, the gas outlet at the top of two grades of cooling cyclones is connected with the air inlet of one cyclonic cooler, and the discharging opening of two grades of cooling cyclones is connected with the charging aperture of spiral discharging device；The discharging opening of cyclone dust extractor bottom is also connected with the charging aperture of spiral discharging device；
The gas outlet at secondary cyclone top is connected with the indirect heat exchanger air inlet being made up of gas change heater and baking tail gases heat exchanger, indirect heat exchanger gas outlet is connected with wet scrubber air inlet, the gas outlet at wet scrubber top is connected with dehydrator air inlet, the gas outlet at dehydrator top is connected with the air inlet purifying baking tail gases pressuring machine, two arms are divided in the gas outlet purifying baking tail gases pressuring machine, one of them arm is connected with baking tail gases heat exchanger air inlet, another arm is connected with the baking tail gases air inlet of indirect air cooling fluid bed bottom and the air inlet of two grades of cooling cyclones；The air inlet of gas change heater is connected with the gas outlet of gas compressor；
The baking tail gases gas outlet on indirect air cooling fluid bed top is connected with the air inlet of circulating fluid bed reactor riser；The air inlet of indirect air cooling fluid bed is connected with the gas outlet of aerator；The discharging opening of spiral discharging device is connected with indirect air cooling fluid bed charging aperture；All it is connected by pipeline between each position of above-mentioned each device.
A kind of refractory iron ore stone powder magnetizing roast system the most according to claim 1, it is characterised in that: the discharging opening of described indirect air cooling fluid bed is connected with follow-up magnetic separation system by slime dam；Discharging opening bottom wet scrubber is connected with slime dam by pipeline with the discharging opening bottom dehydrator.
A kind of refractory iron ore stone powder magnetizing roast system the most according to claim 1, it is characterised in that: the pipeline of gas outlet, described indirect air cooling fluid bed top is provided with oxygen content detection alarm.
4. the technique that the refractory iron ore stone powder magnetizing roast system that a kind utilizes described in any one of claim 1-3 carries out refractory iron ore stone powder magnetizing roast, it is characterized in that: iron ore powder is sequentially sent to one cyclonic preheater, two grades of cyclone preheaters, three grades of cyclone preheaters from feed bin, after completing heat exchange with combustor tail gas out in three grades of cyclone preheaters, the riser of iron ore powder entrance circulating fluid bed reactor carries out magnetizing roast；Being entered dedusting in sack cleaner after gravitational precipitator by the iron ore powder carried secretly in the gas outlet expellant gas of one cyclonic preheater, the iron ore powder of gravitational precipitator and sack cleaner collection enters via feeder in the riser of circulating fluid bed reactor；High temperature magnetization baking tail gases is discharged by the gas outlet of circulating fluid bed reactor riser, indirect heat exchanger is entered through cyclone separator, magnetizing roast tail gas through indirect heat exchanger cooling, enter wet scrubber and carry out dedusting, again after dehydrator is dehydrated, purified baking tail gases pressuring machine pressurizes, and enters combustor；Magnetizing roast reacted high-temperature roasting iron ore powder is discharged by the dipleg of circulating fluid bed reactor, heat exchange is carried out to reclaim the sensible heat of high-temperature roasting iron ore powder with purification baking tail gases again in cooling cyclone, roasting iron ore powder is tentatively cooled down, and purifies baking tail gases and is heated；The roasting iron ore powder tentatively cooled down subsequently enters indirect air cooling fluid bed, carries out sending into follow-up magnetic separation system by slime dam after heat exchange is cooled with purifying baking tail gases.
Refractory iron ore stone powder magnetic roasting process the most according to claim 4, it is characterized in that: described purification baking tail gases carries out heat exchange with the air comb of indirect air cooling fluid bed, aerator the air introduced enters combustor after being heated to 300-400 DEG C by air comb.
Refractory iron ore stone powder magnetic roasting process the most according to claim 4, it is characterized in that: described baking tail gases is after the secondary cyclone gas outlet of circulating fluid bed reactor is discharged, enter indirect heat exchanger, the coal gas introduced by gas compressor, after gas change heater is heated to 400-500 DEG C, respectively enters circulating fluid bed reactor and combustor；Purify after the fired tail gas heat exchanger of baking tail gases is heated to 300-400 DEG C and enter combustor.
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| CN108504853A (en) * | 2017-02-27 | 2018-09-07 | 湖北凤山矿业有限公司 | A kind of Coal Gasification and iron ore magnetic roasting process integration and its device |
| CN108624751A (en) * | 2018-06-15 | 2018-10-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore fluidisation heating low temperature reduction with hydrogen device |
| CN108866319A (en) * | 2018-08-17 | 2018-11-23 | 北京中科领向环保研究院有限公司 | A kind of system and method enhancing steel slag RO phase magnetism |
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