CN101122442B - Iron mineral suspended magnetic baking oven system and baking process - Google Patents
Iron mineral suspended magnetic baking oven system and baking process Download PDFInfo
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- CN101122442B CN101122442B CN2007100128024A CN200710012802A CN101122442B CN 101122442 B CN101122442 B CN 101122442B CN 2007100128024 A CN2007100128024 A CN 2007100128024A CN 200710012802 A CN200710012802 A CN 200710012802A CN 101122442 B CN101122442 B CN 101122442B
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Abstract
An iron mineral suspension magnetization baking furnace system includes a suspension magnetization baking furnace, a feeding bin, an electronic quantitative feeder, a suspension pre-heater, a suspension cooler, a duster, an ahs returning system and an induced draft fan. A discharging port of the electronic quantitative feeder is connected with a feed inlet of a screw feeder through a chute. A discharging port of the screw feeder is connected with a feed inlet of the first stage suspension pre-heater. A discharging port of the second stage suspension pre-heater is connected with a feed inlet of the suspension magnetization baking furnace through a pipe. A flue gas outlet of a cyclone separator of the suspension magnetization baking furnace is connected with an inlet of the second stage suspension pre-heater. A flue gas outlet of the first stage suspension pre-heater is connected with a flue gas inlet of the duster through a pipe. A discharging port of the cyclone separator of the suspension magnetization baking furnace is connected with a feed inlet of the chute through a pipe. The discharging port of the chute is connected with a feed inlet of the first stage suspension cooler. An outlet of the duster is connected with the induced draft fan through a pipe. The invention has the advantages of complete heat recovery system and low energy consumption without production operating problems of ringing, crust, frits, etc.
Description
Technical field
The present invention relates to a kind of iron mineral suspended magnetizing roasting device, specifically relate to one and be applicable to suspended magnetic baking oven system and the roasting technique of from siderite, limonite, goethite, bloodstone, complicated heterogeneous mixing iron ore, iron-containing slag and red mud, producing iron ore concentrate.
Background technology
The principle of magnetizing roast is the process that under the heated condition volatile substance in the refractory iron ore thing (carbon dioxide, water) is removed or di-iron trioxide wherein is reduced into tri-iron tetroxide.The magnetizing roast process of traditional processing technology realizes in shaft kiln, rotary kiln.
The shaft kiln production technology is relatively backward, is easy to generate burning and underburnt, and the iron ore reduction rate is low, can not handle the raw material that is prone to hot powder phenomenon-tion as limonite, siderite one class.
The rotary kiln production technology has overcome the above-mentioned shortcoming of shaft kiln to a certain extent, but hear rate is very high, has ring formation, skinning simultaneously, production operation problems such as frit occur.
No matter shaft kiln or rotary kiln, the production capacity of single device is all not really high.
Summary of the invention
The objective of the invention is provides a kind of iron mineral suspended magnetic baking oven system and roasting technique at above shortcomings in the known technology.
The technical scheme that adopts is:
Iron mineral suspended magnetic baking oven system comprises suspending magnetization roasting furnace, feed hopper, electronics constant feeder, suspended preheater, suspension cooler, deduster, returns ash system, air-introduced machine.
The feed hopper discharging opening be positioned at electronics constant feeder material inlet directly over or connect by chute.The discharging opening of electronics constant feeder, be positioned at the screw feeder machine inlet capable directly over, or the discharging opening of electronics constant feeder is connected with the screw feeder machine inlet capable by chute.The discharging opening of screw(-type) feeder is connected with the feeding mouth of first stage suspension preheater.Secondary suspended preheater discharging opening is connected with the feeding mouth of suspending magnetization roasting furnace by the 8th pipeline.The exhanst gas outlet of the cyclone separator of suspending magnetization roasting furnace is connected with the inlet of secondary suspended preheater by second pipeline.The exhanst gas outlet of first stage suspension preheater is connected with the smoke inlet of deduster by the 3rd pipeline.The discharge gate of the cyclone separator of suspending magnetization roasting furnace is connected with the feeding mouth that stops chute by the 5th pipeline.The discharge gate that stops chute is connected with the feeding mouth of first stage suspension cooler.The discharge gate of first stage suspension cooler is connected with the feeding mouth of secondary suspension cooler.The discharge gate of secondary suspension cooler is connected with three grades of suspension cooler feeding mouths.Three grades of suspension cooler lower ends are provided with discharge gate.The outlet of deduster is connected with air-introduced machine by the 6th pipeline, and the air-introduced machine outlet is connected with the air intake of chimney by the 7th pipeline.
Above-mentioned suspended preheater adopts the two-stage suspended preheater, and above-mentioned suspension cooler adopts three grades of suspension cooler.
Iron mineral suspended magnetic baking oven system of the present invention and roasting technique have following advantage:
1, all kinds of iron-bearing minerals of extensive treatments comprise mine tailing, slag and red mud the like waste, realize the reasonable resources utilization.
2, granular material is suspended in and carries out quick caloic transmission and drastic reduction reaction, calcining quality height in the air-flow.
3, have complete heat recovery system, energy consumption is very low.
4, no ring formation, skinning, production operation problems such as frit appear.
5, automaticity height, running rate height.
6, separate unit stove production capacity is very big, can reach 2,000,000 tons of calcining/years, thereby the unit product investment is low.
Description of drawings
Fig. 1 is the structural representation of iron mineral suspended magnetic baking oven system of the present invention.
The specific embodiment
Iron mineral suspended magnetic baking oven system, comprise suspending magnetization roasting furnace 6, two-stage suspended preheater 4 and 5, first order suspension cooler 7, second level suspension cooler 8, third level suspension cooler 9, feed hopper 1, electronics constant feeder 2, screw(-type) feeder 3, deduster 10, air-introduced machine 12, roots blower 13 and air lift mud pump 14.
The discharging opening of feed hopper 1 is connected with the feeding mouth of electronics constant feeder 2, and the discharging opening of screw(-type) feeder 3 is connected with the charging aperture of first order suspended preheater by feed pipe 16.The discharging opening of first order suspended preheater 4 is connected with the feeding mouth of second level suspended preheater 5 with second pipeline 18 through first pipeline 17, the discharging opening of second level suspended preheater 5 is connected with the charging aperture of suspending magnetization roasting furnace 6 through the 8th pipeline 24, and the exhanst gas outlet of the cyclone separator of suspending magnetization roasting furnace 6 is connected with second level suspended preheater 5 through second pipeline 18.The exhanst gas outlet of first order suspended preheater 4 is connected with the air inlet of deduster 10 through the 3rd pipeline 19, and deduster 10 is an electrostatic precipitator.The cyclone separator discharge gate of suspending magnetization roasting furnace 6 with stop chute 15 feeding mouths and be connected.Stop chute 15 discharge gates and be connected with first order suspension cooler 7 feeding mouths with the tenth pipeline 27 through the 5th pipeline 21, first order suspension cooler exhaust outlet is connected with suspending magnetization roasting furnace 6 air induction conduits through the 4th pipeline 20.First order suspension cooler discharge gate is connected with second level suspension cooler 8 charging apertures with the 12 pipeline 29 through the 11 pipeline 28, second level suspension cooler discharge gate is connected with third level suspension cooler 9 charging apertures with the 14 pipeline 31 through the 13 pipeline 30, and the lower end of suspension cooler 9 is a product offtake.Gas outlet the 6th pipeline 22 of deduster 10 is connected with the air inlet of air-introduced machine 12, is equiped with air door 11 on the 6th pipeline 22.Gas outlet the 7th pipeline 23 of air-introduced machine 12 is connected with chimney 26.The ash discharging hole of deduster 10 is connected with air lift mud pump 14 charging apertures, and roots blower 13 exhaust outlets are connected with air lift mud pump 14 air inlets, and the air lift mud pump discharge gate is connected with second level suspended preheater 5 bottom ash inlet tubes.
Iron mineral suspended magnetizing roast technology comprises following process steps:
1, crude fuel
Raw material can be a kind of in siderite, limonite, goethite, bloodstone, complicated heterogeneous mixing iron ore, iron-containing slag, the red mud, breeze, filter cake all can, it is below 200 microns that particle mean size requires.
Fuel can use coal gas, natural gas, fuel oil etc.
2, feed
Selected raw material is sent in the feed hopper 1, and the raw material in the feed hopper 1 is discharged into screw(-type) feeder 3 after 2 meterings of electronics constant feeder, be delivered in the feed pipe 16 of first stage suspension preheater 4 through screw(-type) feeder 3.
3, preheating
4, magnetizing roast
Material through preheating and preroast enters in the suspending magnetization roasting furnace 6 through the 8th pipeline 24, carries out roasting under heated condition, remove the crystallization water or carbon dioxide after, low impurity raw material roasting becomes the iron ore concentrate calcining, can be directly as product; The roasting under controlled reducing atmosphere of high impurity raw material becomes the magnetic iron ore calcining.
Sintering temperature is selected according to the kind and the character of raw material, and scope is at 300 degrees centigrade to 700 degrees centigrade.
5, material cooling
Calcining from suspending magnetization roasting furnace be discharged into cooling system after hot gas separates and cool off.Cooling is carried out in first order suspension cooler 7, second level suspension cooler 8 and third level suspension cooler 9 step by step, because of 3 grades of suspension cooler are vertically installed, compact to design, so iron ore concentrate can reach countercurrent heat exchange completely with cold air, and magnetic iron ore is oxidized to ferromagnetic γ di-iron trioxide discharges.The air of cooling usefulness is taken from atmosphere.
6, dust pelletizing system
Enter deduster 10 from the next ash-laden gas of first stage suspension preheater through the 3rd pipeline 19 and carry out dedusting, the deduster bottom is provided with air flume, by roots blower and air lift mud pump the dust of collecting is sent in the secondary suspended preheater 5 through the 9th pipeline 25, be implemented in the closed circuit dust that in the dirt system deduster is captured that returns and all reclaim.
Flue gas after the udst separation is sent into chimney 26 emptyings by air-introduced machine 12.
Claims (2)
1. iron mineral suspended magnetic baking oven system, comprise suspending magnetization roasting furnace (6), first order suspended preheater (4) and second level suspended preheater (5), first order suspension cooler (7), second level suspension cooler (8), third level suspension cooler (9), feed hopper (1), electronics constant feeder (2), screw(-type) feeder (3), deduster (10), air-introduced machine (12), roots blower (13) and air lift mud pump (14) is characterized in that:
The discharging opening of feed hopper (1) is connected with the feeding mouth of electronics constant feeder (2), and the discharging opening of screw(-type) feeder (3) is connected with the charging aperture of first order suspended preheater by feed pipe (16); The discharging opening of first order suspended preheater (4) is connected with the feeding mouth of second pipeline (18) with second level suspended preheater (5) through first pipeline (17), the discharging opening of second level suspended preheater (5) is connected through the charging aperture of the 8th pipeline (24) with suspending magnetization roasting furnace (6), and the exhanst gas outlet of suspending magnetization roasting furnace (6) cyclone separator is connected with second level suspended preheater (5) through second pipeline (18); The exhanst gas outlet of first order suspended preheater (4) is connected through the air inlet of the 3rd pipeline (19) with deduster (10), and deduster (10) is an electrostatic precipitator; The cyclone separator discharge gate of suspending magnetization roasting furnace (6) with stop chute (15) feeding mouth and be connected; Stop chute (15) discharge gate and be connected with first order suspension cooler (7) feeding mouth with the tenth pipeline (27) through the 5th pipeline (21), first order suspension cooler exhaust outlet is connected with suspending magnetization roasting furnace (6) air induction conduit through the 4th pipeline (20); First order suspension cooler (7) discharge gate is connected with second level suspension cooler (8) charging aperture with the 12 pipeline (29) through the 11 pipeline (28), second level suspension cooler (8) discharge gate is connected with third level suspension cooler (9) charging aperture with the 14 pipeline (31) through the 13 pipeline (30), and the lower end of third level suspension cooler (9) is a product offtake; Gas outlet the 6th pipeline (22) of deduster (10) is connected with the air inlet of air-introduced machine (12), is equiped with air door (11) on the 6th pipeline (22); Gas outlet the 7th pipeline (23) of air-introduced machine (12) is connected with chimney (26); The ash discharging hole of deduster (10) is connected with air lift mud pump (14) charging aperture, and roots blower (13) exhaust outlet is connected with air lift mud pump (14) air inlet, and the air lift mud pump discharge gate is connected with second level suspended preheater (5) bottom ash inlet tube.
2. the roasting technique of iron mineral suspended magnetic baking oven system is characterized in that comprising following process steps:
A, crude fuel
Raw material can be a kind of in siderite, limonite, goethite, bloodstone, complicated heterogeneous mixing iron ore, iron-containing slag, the red mud, breeze, filter cake all can, it is below 200 microns that particle mean size requires;
Fuel can use coal gas, natural gas, fuel oil;
B, feed
Selected raw material is sent in the feed hopper (1), and the raw material in the feed hopper (1) is discharged into screw(-type) feeder (3) after electronics constant feeder (2) metering, be delivered in the feed pipe (16) of first order suspended preheater (4) through screw(-type) feeder (3);
C, preheating
Material is brought in the body of first order suspended preheater (4) and with flue gas through feed pipe (16) by air-flow and is separated, be mixed in the second level suspended preheater (5) through first pipeline (17), second pipeline (18) and hot flue gas then from suspending magnetization roasting furnace, be preheated and preroast, the raw material of preroast carries out secondary separation with flue gas at this;
D, magnetizing roast
In the 8th pipeline (24) enters suspending magnetization roasting furnace (6), under heated condition, carry out roasting through the material of preheating and preroast, remove the crystallization water or carbon dioxide after, low impurity raw material roasting becomes the iron ore concentrate calcining, can be directly as product; The roasting under controlled reducing atmosphere of high impurity raw material becomes the magnetic iron ore calcining;
Sintering temperature is selected according to the kind and the character of raw material, and scope is at 300 degrees centigrade to 700 degrees centigrade;
E, material cooling
Calcining from suspending magnetization roasting furnace be discharged into cooling system after hot gas separates and cool off; Cooling is carried out in first order suspension cooler (7), second level suspension cooler (8) and third level suspension cooler (9) step by step, iron ore concentrate can reach countercurrent heat exchange completely with cold air, and magnetic iron ore is oxidized to ferromagnetic γ di-iron trioxide discharge; The air of cooling usefulness is taken from atmosphere;
F, dust pelletizing system
Enter deduster (10) from the next ash-laden gas of first order suspended preheater through the 3rd pipeline (19) and carry out dedusting, the deduster bottom is provided with air flume, by roots blower and air lift mud pump the dust of collecting is sent in the second level suspended preheater (5) through the 9th pipeline (25), be implemented in the closed circuit dust that in the dirt system deduster is captured that returns and all reclaim; Flue gas after the udst separation is sent into chimney (26) emptying by air-introduced machine (12).
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| CN2007100128024A CN101122442B (en) | 2007-09-12 | 2007-09-12 | Iron mineral suspended magnetic baking oven system and baking process |
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