CN203079998U - Rotary hearth furnace equipment for performing segment treatment on iron ore - Google Patents
Rotary hearth furnace equipment for performing segment treatment on iron ore Download PDFInfo
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- CN203079998U CN203079998U CN 201320003209 CN201320003209U CN203079998U CN 203079998 U CN203079998 U CN 203079998U CN 201320003209 CN201320003209 CN 201320003209 CN 201320003209 U CN201320003209 U CN 201320003209U CN 203079998 U CN203079998 U CN 203079998U
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Abstract
The utility model relates to rotary hearth furnace equipment for performing segment treatment on iron ore. The rotary hearth furnace equipment comprises a furnace body, a rotary furnace hearth, a transmission part, an electric control part and movable partition wall devices, wherein the furnace body comprises a furnace wall and a furnace top; 50-100 gas burners are circularly arranged on a part, which is 400-1000mm higher than the furnace hearth, of the outer side of the furnace wall in a certain distance at intervals; a secondary air nozzle is respectively arranged above each gas burner; a circular orbit is arranged on a part, which is close to the furnace top, of the furnace body; two sets of movable partition wall devices are suspended on the circular orbit and can move between a feeding hole and a discharge opening along with the circular orbit; the height of each movable partition wall device is slightly lower than the furnace height of the furnace body; and the interior of the rotary furnace hearth is separated into three sections, namely a low-temperature reduction section at the temperature of 1000-1200 DEG C, a high-temperature melting section at the temperature of 1300-1400 DEG C and a cooling section at the temperature of 500-900 DEG C according to different temperatures through the movable partition wall devices; and 10-20 groups of water-cooled tubes are uniformly arranged on the outer side of the furnace wall.
Description
Technical field
The utility model relates to the Iron and Steel Production field, particularly a kind of rotary hearth furnace equipment of staging treating iron ore.
Background technology
The rotary heating furnace that rotary hearth furnace is used by steel rolling develops, apart from modern existing more than 30 year history.Iron content, zinc-containing dust that originally rotary hearth furnace is used for handling in the steel manufacture process and is produced, and the waste when other iron content waste, chromium-containing oxide, production stainless steel.Along with resource and environmental protection pressure become increasingly conspicuous, the rotary hearth furnace technology progressively receives the concern of steel industry, and strides forward to the Iron and Steel Production main flow.Over surplus in the of nearly ten year, the exploration that the rotary hearth furnace technology transplant is produced to ironmaking makes rotary hearth furnace become equipment of direct reduction, the related process that utilizes rotary hearth furnace to carry out Iron and Steel Production attains full development, and become one of up-to-date coal-based iron-smelting process, all obtained application in melting and reducing, the joining in the fields such as carbon reduction of Steel Plant's zinc-containing dust of iron ore.Rotary hearth furnace has become the equipment of producing sponge iron, metallized pellet and pearl iron.
The rotary hearth furnace technology is with iron-bearing mineral or dust, coal dust and binding agent mixed pelletizing, dry back evenly is layered on the furnace bottom of rotary hearth furnace by material distributing machine, furnace bottom rotatablely moves with certain speed, mineral aggregate experienced preheating section, reduction section and cooling section in 20 ~ 30 minutes, be reduced to the technology of metallized pellet or pearl iron at last.Rotary hearth furnace is when producing, the capacity of furnace is supplied with by the burning of coal gas, Sweet natural gas or oil in the burner, the spent air temperture that produces in the stove is very high, can reclaim heat energy by regenerator and interchanger, thereby coal gas and combustion air are preheating to specified temperature, to be used for the oven dry of green-ball, described coal gas and combustion air enter atmosphere through dedusting at last.
Compare with other iron smelting method, have special advantages based on the iron smelting method of rotary hearth furnace: coal-based completely ironmaking need not coke; Requirement to raw material, fuel and reductive agent is more flexible, and is not high to the raw material requirement of mechanical strength; Adopt spacious flame heating, Heating temperature is than the Heating temperature height in other direct reducing process, thereby is easy to form the thicker iron shot of particle after reducing, and reduction rate is fast, can finish in 20 ~ 40 minutes, and production efficiency is higher; Technology is simple, and the structure of equipment is fairly simple, and investment cost is relatively low; Technological operation is simple, is easy to grasp.Yet in the actual production, except scale is less, also have the following disadvantages:
(1) in general furnace atmosphere was divided into for two stages, and leading portion is an oxidizing atmosphere, required to improve rapidly temperature of charge; Back segment is a reducing atmosphere, is beneficial to rapid reduction.This is difficult control in middle-size and small-size stove, and theoretical investigation confirms that the reduction of ferriferous oxide is that segmentation is carried out, and can all finish when lower temperature, there is no need to keep furnace temperature very high in this stage.
(2) the used Si-Mo rod of rotary hearth furnace internal heating is at high temperature worked for a long time and is blown easily, and work-ing life is shorter, constantly changes the furnace life that Si-Mo rod can reduce rotary hearth furnace, also influences working efficiency.
Rise day by day along with imported iron ore stone price presses for the paces that we accelerate to develop domestic iron ore.China's iron ore resource reserves are huge, but the many rich ores of lean ore are few, it is more that association is mingled with the ore deposit, needing strict ore dressing to obtain iron ore concentrate at lean ore just can be used for producing, handle at being difficult to, the complicated ore that perhaps is difficult to comprehensive reutilization, as high phosphorus ore, rare-earth mineral and boron magnesium ore deposit, it is imperative to design new production technique.
The utility model content
The purpose of this utility model is to overcome defectives such as existing ironmaking equipment ironmaking small scale, work-ing life be short, thereby a kind of smelting equipment that can sectional temperature control is provided.
To achieve these goals, the utility model provides a kind of rotary hearth furnace equipment of staging treating iron ore, comprising: at the bottom of body of heater, the rotary furnace, driving part, electric control system and movable partition device; Wherein, described body of heater comprises furnace wall and furnace roof;
The position that is higher than furnace bottom 400 ~ 1000mm on the outside, described furnace wall is annular at a certain distance 50 ~ 100 coal gas burners is installed at interval, and an overfire air jet also is installed above each coal gas burner separately; Described coal gas burner and overfire air jet all can independent control;
Circular orbit is installed near the furnace roof place in described body of heater, is hung with two cover movable partition devices on described circular orbit, described two cover movable partition devices move between the feeding mouth of rotary hearth furnace and discharge port along described circular orbit; Described movable partition height of devices is a little less than the stove height of described body of heater, can not contact with described movable partition device when guaranteeing to be paved with at the bottom of the rotary furnace of green-ball rotation; Described movable partition device is divided into three sections with rotary hearth furnace inside according to the difference of temperature: 1000 ~ 1200 ℃ low-temperature reduction section, 1300 ~ 1400 ℃ high-temperature fusion section, 500 ~ 900 ℃ cooling section;
10 ~ 20 groups of water cooling tubes are evenly arranged in the outside of described furnace wall, and every group by valve control separately.
In the technique scheme, described low-temperature reduction interval accounts for 50 ~ 70% of whole stove inner periphery, and the high-temperature fusion interval accounts for 20 ~ 30% of whole stove inner periphery, accounts for 10 ~ 30% of whole stove inner periphery between the cooling zone.
Advantage of the present utility model is:
On the thermomechanical analysis basis of the utility model main thing phase in iron ore deposit, by rotary hearth furnace support equipment (mainly being burner and movable partition baffle plate) is implemented to transform, adopt the temperature controlled method of segmentation to produce comparatively purified pearl iron, can replace steel scrap to be used as electric furnace or converter steelmaking, realize the efficient utilization of iron ore deposit, had certain value.
Description of drawings
Fig. 1 is the structural representation of the rotary hearth furnace equipment of staging treating iron ore of the present utility model.
Embodiment
Now the utility model will be further described in conjunction with the accompanying drawings.
With reference to figure 1, rotary hearth furnace of the present utility model comprises: at the bottom of body of heater, the rotary furnace, driving part, electric control system and suspension type movable partition device; Wherein, described body of heater comprises furnace wall and furnace roof.
The position that is higher than furnace bottom 400 ~ 1000mm on furnace wall, the rotary hearth furnace outside is annular at a certain distance 50 ~ 100 coal gas burners is installed at interval, an overfire air jet also is installed above each coal gas burner separately, promptly on furnace wall, the rotary hearth furnace outside, 50 ~ 100 overfire air jets is installed; But described coal gas burner and overfire air jet be independent control all.
Near the furnace roof place circular orbit is installed in stove, is hung with two cover movable partition devices on described circular orbit, this two covers movable partition device can move in the scope of circular orbit between feeding mouth and discharge port; Described movable partition height of devices is a little less than the stove height of described body of heater, can not contact with described movable partition device when guaranteeing to be paved with at the bottom of the rotary furnace of green-ball rotation.By this two covers movable partition device, can adjust the range of distribution in differing temps interval in the stove.Utilize described movable partition device, rotary hearth furnace inside is divided into three sections according to the needs of temperature range: 1000 ~ 1200 ℃ low-temperature reduction section; 1300 ~ 1400 ℃ high-temperature fusion section; 500 ~ 900 ℃ cooling section.In general, the low-temperature reduction interval accounts for 50 ~ 70% of whole stove inner periphery, and the high-temperature fusion interval accounts for 20 ~ 30% of whole stove inner periphery, accounts for 10 ~ 30% of whole stove inner periphery between the cooling zone.
Evenly arrange 10 ~ 20 groups of water cooling tubes on the furnace wall, the outside, every group all can be by independent valve control.
It more than is the explanation that the structure of rotary hearth furnace of the present utility model is done.
The staging treating method that realizes based on rotary hearth furnace of the present utility model may further comprise the steps:
At first determine Optimal Production temperature and each production phase required time,, calculate the circumference ratio of each shared body of heater in humidity province in conjunction with furnace bottom speed of rotation in producing according to mineral aggregate;
Then, move the movable partition device of upper of furnace body, will be divided into low-temperature reduction section, high-temperature fusion section and cooling section in the stove, and described low-temperature reduction section, high-temperature fusion section and cooling section are maintained certain proportion according to calculation result before.
Open the coal gas burner of corresponding position on the furnace wall at last, guarantee each interval production temperature in the stove.
The rotary hearth furnace of describing before adopting of the present utility model and based on the staging treating method of this rotary hearth furnace can improve the smelting quality of iron ore.Known: main valuable mineral is a ferriferous oxide in the iron ore, also contains gangue simultaneously, as silicon, aluminium, calcium, magnesium oxide.Theoretical investigation shows: ferriferous oxide is at the metallic iron of just reducible formation disperse below 1200 ℃, metallic iron can contact with other material diffusions when cohesion is grown up afterwards, as elements such as carbon, silicon, phosphorus, sulphur, p and s as harmful element is not wish to spread the infiltration metallic iron, and the long more diffusion of high more hold-time of temperature is abundant more, the especially diffusion of the material under liquid state.When the metallic iron that restores entered high temperature (about more than 1400 ℃), metallic iron and slag charge melt cohesion respectively grew up, and occurs separating based on both density, capillary difference, thereby obtains comparatively purified pearl iron.Often contain special valuable element or impurity element in the iron ore, as the boron in the boron magnesium ore deposit, rare earth element in the rare-earth mineral, phosphoric in the high phosphorus ore etc., in order to realize the efficient utilization of iron ore deposit, need be with different valuable element separation and concentrations, and just can realize this target based on the staging treating method of rotary hearth furnace of the present utility model.Specifically, the rotary hearth furnace staging treating has three main phase in this utility model: between 1000 ~ 1200 ℃ abundant insulation reduction zone, and 1300 ~ 1400 ℃ the Flashmelt interval of growing up, 500 ~ 900 ℃ the cold interval of going.Time spent in low-temperature reduction stage is 2 ~ 3 times of high-temperature fusion stage in addition, so rationally the ratio in distribution temperature interval can improve capacity usage ratio.
Below in conjunction with a plurality of embodiment, effect of the present utility model is described further.
Embodiment 1
Get iron ore concentrate and explore, table 1 is this breeze composition, and this ore deposit iron content is higher as can be known, and basicity is lower, is unfavorable for fusion, is joining under the competent prerequisite of carbon again with addition of an amount of Wingdale and fluorite, and melt stage will keep the sufficiently long time during production.Table 2 is to produce batching, and working condition is set in the stove: the low-temperature reduction district keeps 1200 ℃, duration 25 minutes; The high-temperature fusion district keeps 1400 ℃, duration 10 minutes; The cooling zone keeps 500 ℃, duration 5 minutes.Through 40 minutes furnace high-temperature reaction, collect product at discharge port, fragmentation obtains pearl iron, and by analysis, composition sees Table 3.
The chemical ingredients of the smart powder of table 1 iron
The smart powder rotary hearth furnace of table 2 iron production batching
The smart powder rotary hearth furnace of table 3 iron is produced gained pearl ferrous components
Embodiment 2
Get the high phosphorus ore of west place in Hubei and explore, table 4 is these ore deposit compositions, and this ore deposit iron content is higher as can be known, and basicity is very low, is unfavorable for fusion, thus should be with addition of the Wingdale and the fluorite of capacity, and melt stage will keep the sufficiently long time during production.Table 5 is to produce batching, and working condition is set in the stove: the low-temperature reduction district keeps 1200 ℃, duration 30 minutes; The high-temperature fusion district keeps 1400 ℃, duration 12 minutes; The cooling zone keeps 500 ℃, duration 5 minutes.Through 47 minutes furnace high-temperature reaction, collect product at discharge port, fragmentation obtains pearl iron, and by analysis, composition sees Table 6.
The high phosphorus ore composition of table 4
The high phosphorus ore rotary hearth furnace of table 5 production batching
The high phosphorus ore rotary hearth furnace of table 6 is produced gained pearl ferrous components
Embodiment 3
Get boron magnesium ore deposit, Dandong and explore, table 7 is to produce batching, and this ore deposit iron content, boron are higher as can be known, and melting properties is higher, and basicity is lower, gets final product with addition of the Wingdale and the fluorite of capacity, and melt stage will keep the sufficiently long time during production.Table 8 is to produce batching, and working condition is set in the stove: the low-temperature reduction district keeps 1200 ℃, duration 25 minutes; The high-temperature fusion district keeps 1400 ℃, duration 10 minutes; The cooling zone keeps 500 ℃, duration 5 minutes.Through 40 minutes furnace high-temperature reaction, collect product at discharge port, fragmentation obtains pearl iron, and by analysis, composition sees Table 9.
The chemical ingredients of table 7 ferro-boron concentrate
Table 8 ferro-boron concentrate rotary hearth furnace production batching
Table 9 ferro-boron concentrate rotary hearth furnace is produced gained pearl ferrous components
From the foregoing description as can be seen, rotary hearth furnace of the present utility model and have good effect based on the staging treating method of this rotary hearth furnace.
It should be noted last that above embodiment is only unrestricted in order to the explanation the technical solution of the utility model.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is made amendment or is equal to replacement, the spirit and scope that do not break away from technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (2)
1. the rotary hearth furnace equipment of a staging treating iron ore is characterized in that, comprising: at the bottom of body of heater, the rotary furnace, driving part, electric control system and movable partition device; Wherein, described body of heater comprises furnace wall and furnace roof;
The position that is higher than furnace bottom 400 ~ 1000mm on the outside, described furnace wall is annular at a certain distance 50 ~ 100 coal gas burners is installed at interval, and an overfire air jet also is installed above each coal gas burner separately; Described coal gas burner and overfire air jet all can independent control;
Circular orbit is installed near the furnace roof place in described body of heater, is hung with two cover movable partition devices on described circular orbit, described two cover movable partition devices move between the feeding mouth of rotary hearth furnace and discharge port along described circular orbit; Described movable partition height of devices is a little less than the stove height of described body of heater, can not contact with described movable partition device when guaranteeing to be paved with at the bottom of the rotary furnace of green-ball rotation; Described movable partition device is divided into three sections with rotary hearth furnace inside according to the difference of temperature: 1000 ~ 1200 ℃ low-temperature reduction section, 1300 ~ 1400 ℃ high-temperature fusion section, 500 ~ 900 ℃ cooling section;
10 ~ 20 groups of water cooling tubes are evenly arranged in the outside of described furnace wall, and every group by valve control separately.
2. the rotary hearth furnace equipment of staging treating iron ore according to claim 1, it is characterized in that, described low-temperature reduction interval accounts for 50 ~ 70% of whole stove inner periphery, and the high-temperature fusion interval accounts for 20 ~ 30% of whole stove inner periphery, accounts for 10 ~ 30% of whole stove inner periphery between the cooling zone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320003209 CN203079998U (en) | 2013-01-05 | 2013-01-05 | Rotary hearth furnace equipment for performing segment treatment on iron ore |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320003209 CN203079998U (en) | 2013-01-05 | 2013-01-05 | Rotary hearth furnace equipment for performing segment treatment on iron ore |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074460A (en) * | 2013-01-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | Rotary hearth furnace equipment for segment handling of iron ore and handling method |
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- 2013-01-05 CN CN 201320003209 patent/CN203079998U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074460A (en) * | 2013-01-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | Rotary hearth furnace equipment for segment handling of iron ore and handling method |
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Granted publication date: 20130724 |