CN206256147U - A kind of system for processing lateritic nickel ore - Google Patents

Abstract

The utility model discloses a kind of system for processing lateritic nickel ore, the system includes：Pressure ball molding system, rotary hearth furnace direct-reduction system, mill ore magnetic selection system and iron powder briquetting system；Wherein, the discharging opening of the pressure ball molding system is communicated with the feeding mouth of rotary hearth furnace direct-reduction system, the discharging opening of the rotary hearth furnace direct-reduction system is communicated with the feeding mouth of the mill ore magnetic selection system, and the feeding mouth of the ferronickel metal powder discharging opening of the mill ore magnetic selection system and the iron powder briquetting system is communicated.Can realize that aqueous lateritic nickel ore green-ball directly enters stove using the utility model system treatment lateritic nickel ore, eliminate the drying flow of technique front end, investment reduction；Reducing energy consumption, is conducive to obtaining nickel grade product higher simultaneously, improves product quality.

Description

A kind of system for processing lateritic nickel ore

Technical field

The utility model is related to the system for processing lateritic nickel ore, further to the system answering in treatment lateritic nickel ore With belonging to the process field of lateritic nickel ore.

Background technology

Material forming (pressure ball or pelletizing)-drying-direct-reduction flow being used rotary hearth furnace direct-reduction technique more, into Pelletizing after type can just be distributed into rotary hearth furnace after needing drying, therefore must be separately provided drying plant and dried；Additionally, through turning bottom The metallized pellet of stove direct-reduction, also needs to be discharged outside rotary hearth furnace after supercooling, and is cooled down by being arranged on rotary hearth furnace Water-cooling wall in section is cooled down, and this also result in the waste of reduzate heat.

Lateritic nickel ore raw aqueous can reach 30%, with reducing agent, additive mixed-forming after pelletizing contain it is higher Moisture, needs increase drying unit that pelletizing drying can just be entered into rotary hearth furnace operation in common process.

The Chinese utility model patent of Publication No. CN1235268A discloses a kind of for rotary table, especially turns The charging of bottom stove and distribution device.The device includes material feed mechanism (2,3), material transfer mechanism (304) and material gravity Topple over guide groove (4), the said equipment includes the staticizer of the distribution material for difference, and the mechanism includes toppling over guide groove (4) Cloth leading edge (214), it has profile of substantially curve, and the derivative of the curve is rotary table (10) in work The incremental linear function of the radius of the part between platform center and its edge.Guide groove (4) is toppled over respect to panoramic table (10) substantially footpath Set to ground, and be arranged on one and be nearly parallel in the plane of the plane of the rotary table (10), and with a material Groove (5) is acted together, and the outlet edge (205) of the hopper is set near the surface of workbench, and with topple over guide groove (4) The substantially similar curved profile of cloth leading edge (214).Guide groove (4) is toppled over by being fixed on the base portion of the guide groove (4) (204) Multiple next doors (114) be separated into multiple passages (104), guide groove (5) separates multiple passages (105) by multiple next doors (115), leads to Road has the section as the material mouth of the passage (104) of guide groove (4).Feed is equipped (103) and is led including that will topple over for manipulation Groove (4) is separated into the mechanism in the next door (114) of passage (104), the next door can relatively described guide groove (4) base portion (204) it is mobile.Meanwhile, feeding adjusting device includes dynamic mechanism (103), for toppling over the whole cross section of guide groove (4) Differential type feed is carried out, the device is arranged between guide groove (4) and feed arrangement (2,3).Dynamic difference feeding device includes Multiple gates (113), these gates have appropriate separate operation device (123) and are configured to controllable by leading The each entrance of passage (104) that groove is separated into.These gates are all arranged on a top for toppling over guide groove (4) and are formed Chute (203) in.Apparatus above is by suitable hitch (101) on a support frame (1)；The method institute The major defect of presence is cannot to process the pelletizing do not dried, it is necessary in balling stage addition stoving process, increased technique energy Consumption；Directly using the heat entrained by flue gas cannot increase heat loss simultaneously.

The Chinese utility model patent of Application No. 201510648755.7 discloses a kind of cooling in rotary hearth furnace The method synchronous with drying, comprises the following steps that：First, the red ball of rotary hearth furnace is equably fallen in feed end by the first deflector chute On lower floor's carrier bar of A2, while the rotary hearth furnace green-ball is equably fallen in the upper strata chain of feed end B1 by the first distributing device On plate；Secondly, by the rotating speed for adjusting the upper strata carrier bar and lower floor's carrier bar, it is ensured that the rotation direction of the two is opposite；Then, it is cold The red ball that air rises and is placed through on lower floor's carrier bar, lowers the temperature to the red ball, while air temperature increase transitions Into preheated air；Then, the preheated air continues to rise, and is then passed through the green-ball on the upper strata carrier bar, and the green-ball is dried, Preheating, while the preheated air temperature declines, is transformed into the hot-air containing certain heat；Finally, the hot-air is extracted, and enters Enter falling dust room, then the dirt pocket is entered by the falling dust room, being transferred in the air preheating system in rotary hearth furnace by the dirt pocket is made With.The red ball of rotary hearth furnace reduction product must be discharged in the method can just carry out cooling treatment outside rotary hearth furnace, not only need individually to set Cooling device is put, thermal losses can be also caused；Additionally, being cooled down using air to rotary hearth furnace reduction product, rotary hearth furnace is easily caused The oxidation of product, can reduce the degree of metalization of product, influence product quality.

The Chinese utility model patent of Application No. 201510649237.7 discloses a kind of for cooling, baking in rotary hearth furnace Synchronous high-performance device is done, it includes：Bearing block, clutch shaft bearing, second bearing, upper network chain/carrier bar, lower network chain/carrier bar, exhausting Machine, casing, upper dividing wall, middle dividing wall, lower dividing wall, maintenance door, bellows, striker plate, support frame, reductor and driving electricity Machine；The two ends of the upper link plate are respectively mounted and connect the clutch shaft bearing, and the lower carrier bar is respectively mounted and connects the second bearing, and And the clutch shaft bearing is fixedly arranged on the bearing block with the second bearing is in overlying relation；The casing is placed on the support frame On, the maintenance door is opened up on the casing, and the maintenance door is placed on the support frame, the bellows are located on the casing, and this is taken out Blower fan is located at bellows top；In the casing internal, dividing wall is located on the upper link plate on this；Dividing wall is located on this in this Between network chain/carrier bar and the lower carrier bar；The lower dividing wall is located at the lower section of the lower carrier bar.Rotary hearth furnace reduction product palpus in the method Cooling treatment can be just carried out outside discharge rotary hearth furnace, not only needs to be separately provided cooling device, can also cause thermal losses；This Outward, rotary hearth furnace reduction product is cooled down using air, easily causes the oxidation of rotary hearth furnace product, the metallization of product can be reduced Rate, influences product quality.

Summary is visible, in the system technique of current utilization rotary hearth furnace treatment lateritic nickel ore, the drying of green-ball and also The cooling for originating in thing is respectively adopted different equipment and technique is processed, and takes up an area face greatly, and technological process is long, efficiency of utilization Low, this not only construction cost increase can also cause the problems such as energy consumption index is higher, production cost is higher, it would be highly desirable to improve.

Utility model content

The purpose of this utility model is to provide a kind of system for processing lateritic nickel ore, is processed using system of the present utility model Lateritic nickel ore, can be directly entered rotary hearth furnace using aqueous lateritic nickel ore green-ball, and the drying of green-ball, pre- is realized in rotary hearth furnace Heat, then original product is gone back through rotary hearth furnace direct-reduction acquisition, by follow-up mill ore magnetic selection and iron powder briquetting operation, obtain high-grade Ferronickel metal derby；

Above-mentioned purpose of the present utility model is achieved through the following technical solutions：

The utility model provides a kind of system for processing lateritic nickel ore, including：Pressure ball molding system, rotary hearth furnace are straight Connect and go back original system, mill ore magnetic selection system and iron powder briquetting system；Wherein, the discharging opening of pressure ball molding system is directly gone back with rotary hearth furnace The feeding mouth of original system is communicated, and the discharging opening of rotary hearth furnace direct-reduction system is communicated with the feeding mouth of mill ore magnetic selection system, ore grinding The ferronickel metal powder discharging opening of magnetic separation system is communicated with the feeding mouth of iron powder briquetting system；

The rotary hearth furnace direct-reduction system includes distribution device drying and preheating, rotary hearth furnace preheating and direct-reduction, turns Bottom stove cooling and oxidation, rotary hearth furnace discharging, its structure include annular body of heater and rotatable ring-shaped furnace bottom, and the annular body of heater is by interior All furnace walls, periphery furnace wall and annular furnace roof composition, inner circumferential furnace wall are coaxially disposed with periphery furnace wall, the inside and outside side point of annular furnace roof The top of inner circumferential furnace wall and periphery furnace wall is not connected to, annular furnace is formed, and described ring-shaped furnace bottom is correspondingly arranged at the annular furnace The lower section of thorax；Cloth area, preheating zone, middle warm area, high-temperature region and cooling zone are circumferentially disposed with the annular furnace, and Cooling zone and cloth area are adjacent, are separated with the barricade of radial direction between cloth area and preheating zone, between high-temperature region and cooling zone, at this Being left between the lower end of barricade and ring-shaped furnace bottom can be at least through one layer of interval of material；In the preheating zone, middle warm area and height Burner is housed on the internal and external circumferential furnace wall of warm area, drawing mechanism is provided between the furnace bottom in cooling zone and cloth area；In the cloth area Furnace bottom and cooling zone between is provided with channel distributor, and channel distributor cross section two ends are located between barricade；In the chute Furnace roof side above distributing device is provided with feeder channel；In cooling zone described in rotary hearth furnace near the internal and external circumferential furnace wall of ring-shaped furnace bottom It is provided with gas blowing device；Rotary hearth furnace furnace roof above corresponding to channel distributor is provided with exhaust apparatus.

Preferably, it is arranged on the thickness of the height higher than the material for entering cooling zone of the gas blowing device of internal and external circumferential furnace wall Degree；Described drawing mechanism is spiral discharging device.

The channel distributor can be made up of with horizontal plane multistage the gravity chute of certain angle, each section of tilting Chute head and the tail are sequentially connected and are alternateed in circumferencial direction staggered, and every section of gravity chute end forms blanking with barricade Passage, discharge flapper is set in the head end of the corresponding hypomere gravity chute of each blanking channel；First section gravity chute position In the underface of feeder channel, the end of latter end gravity chute is located at the top in cloth area；Fixing device is by each section of tilting Chute is fixed together and is connected with the vibra feeder of furnace roof；The gravity chute in sector, the radian at its two ends with Radian on rotary hearth furnace circumferencial direction is consistent, and its cross section is parallel with rotary hearth furnace radial direction.

Preferably, feeder channel is identical with the width of first paragraph gravity chute along the width of rotary hearth furnace radial direction.

Preferably, the size of blanking channel is 100~200mm；The utility model finds that blanking channel width is 100mm ~200mm can be such that pelletizing smoothly falls.If undersized, material falling speed is excessively slow, influences cloth effect；If oversized, Material falls to concentrating, and pelletizing can be caused to pile up.

Preferably, barricade and the spacing distance of rotary furnace bottom are 60~150mm.The barricade distance at distribution device two ends turns Bottom stove furnace bottom is highly 60~150mm, for cooling zone, cloth area and other zone isolations to be opened, it is ensured that blowing gas are to height Warm reduzate does not interfere with the gas after other zone atmospheres, and heat exchange while cooling can up drying and preheating green-ball； Additionally, not interfering with the material movement in each region also.If barricade is highly excessive apart from furnace bottom, it is impossible to ensure isolation effect；If high Spend small, motion of the material in stove can be influenceed.

Preferably, gravity chute and the angle of level are 5~15 °, if angle is too small, pelletizing is stopped in distribution device Overlong time, can influence production efficiency；If angle is excessive, the pelletizing residence time is too short, it is impossible to reach sufficient drying effect, ball Group can burst after preheating zone is entered.

Preferably, the end perigee distance rotary furnace bottom of most latter end gravity chute is highly 40~80mm, if should Apart from excessive, pelletizing can be more easy to fragmentation during falling；If apart from too small, bottom is heated excessively, influences the life-span of device.

Described gravity chute is radially divided into multistage chute runway, and dividing plate in annular body of heater by the dividing plate of arc It is isocentric circular arc with annular body of heater, the height of dividing plate is higher than thickness of the material on chute runway.

Preferably, chute runway quantity is 2~5, if quantity is very few, green-ball easily causes heap on wall scroll chute Product, influence drying and lead zinc volatilization effect；If quantity is excessive, wall scroll chute is undersized, and the larger green-ball of particle diameter cannot enter Enter.

Preferably, the height of dividing plate is 60~80mm, while it is highly higher by least 20mm than material bed, thus be may be such that The feed pelletizing of epimere chute all feeds hypomere chute, and up to whole clothes to rotary furnace bottom.

The gravity chute is by wire netting or is uniformly distributed the metallic plate of stomata and is made；The preferably circular gas of stomata Hole, it is furthermore preferred that a diameter of 4~7mm of the circular stomata.Hole diameter is too small, and gas is small with the contact surface of green pellets, shadow Its drying effect is rung, hole diameter is excessive, and green pellets can leak down or be stuck in stomata.

Preferably, distance of the channel distributor in circumferencial direction away from rotary hearth furnace both sides furnace wall is 100~200mm；Should Distance can ensure that chute feeder will not collide rotary hearth furnace side wall, and also pelletizing can be covered with into rotary furnace bottom.

The method that lateritic nickel ore is processed using the system, including：

(1) aqueous green pellets is made after mixing lateritic nickel ore, reducing agent and additive in pressure ball molding system；

(2) aqueous green pellets is distributed into channel distributor by the feeder channel that rotary hearth furnace is reduced directly system, passes through The gravity chute of channel distributor progressively declines；Wherein, the gas and the height for entering into cooling zone of gas blowing device injection Warm reduzate carries out heat exchange and produces preheating gas, and up preheating gas are to the green-ball that progressively declines in gravity chute Carry out heating, drying and preheated pelletizing；The blanking of the most latter end gravity chute that the pelletizing of preheating passes through channel distributor Passage reaches rotary hearth furnace cloth area, sequentially passes through rotary hearth furnace preheating zone, middle warm area, high-temperature region generation reduction reaction, obtains high temperature Reduzate；The reduzate of high temperature enters cooling zone, and the oxidizing gas being blown with Gas injection gas device are contacted, will The reduzate of high temperature is cooled down and generates preheating gas, in the presence of barricade preheating gas go upward to distribution device drying it is aqueous Green-ball；The oxidizing gas of injection aoxidize the part metals iron in reduzate simultaneously；Reduzate after cooling passes through Material device discharges out of the furnace；

(3) by the reduzate for discharging out of the furnace send into mill ore magnetic selection system, obtain respectively high-grade ferronickel metal powder and Mill selects tailings；

(4) the ferronickel metal powder from the ferronickel metal powder outlet discharge of mill ore magnetic selection system sends into iron powder briquetting system, obtains To high-grade ferronickel metal derby.

Wherein, after high temperature reduction product reaches cooling zone, the oxidizing gas sprayed with gas blowing device are contacted, a side There is heat exchange in face, high temperature reduction product is by gas cooling, and the gas for preheating continues up for drying lateritic nickel ore green-ball Group；Another aspect oxidizing gas react with reduzate, and according to macroscopic property, metallic iron will be sent out prior to metallic nickel Raw oxidation, therefore part metals iron generation iron oxide will be had, and metallic nickel will not be oxidized substantially, also be originated in so as to improve Nickel grade in thing, product quality is lifted.

Preferably, moisture≤20% of aqueous green pellets described in step (1).If moisture is too high, it is impossible to full Sufficient rotary hearth furnace production requirement, can burst in reduction process.

Preferably, the gas of gas blowing device injection is the oxidizing gas of oxygen content 15~40% in step (2)；Spray It is anti-that the oxidizing gas for blowing can occur oxidation while accelerating high temperature reduction product to cool down, also with the metal in reduzate Should, because metallic iron is more easy to be oxidized than metallic nickel, therefore a part of metallic iron becomes oxide, and metallic nickel is unaffected, So as to improve the nickel grade of reduzate, be conducive to subsequently obtaining nickel grade ferronickel metal powder higher.

Up preheating gas carry out heating, drying to the green-ball progressively declined in gravity chute in step (2), are produced Raw heat smoke and vapor is discharged outside rotary hearth furnace by exhaust apparatus.

The utility model method can be directly entered rotary hearth furnace using aqueous green-ball, and the baking of green-ball is realized in rotary hearth furnace Dry, preheating, then original product is gone back through rotary hearth furnace direct-reduction acquisition, by follow-up mill ore magnetic selection and iron powder briquetting operation, obtain high The ferronickel metal derby of grade.

Using the main beneficial effect of the utility model system treatment lateritic nickel ore：

(1) stove is directly entered using aqueous lateritic nickel ore green-ball, eliminates the drying flow of technique front end, investment reduction, While reducing energy consumption.

(2) be conducive to obtaining nickel grade ferronickel metal derby higher, improve product quality.

Brief description of the drawings

Fig. 1 shows that the flow of the system for processing lateritic nickel ore according to the rotary hearth furnace of the utility model one embodiment is illustrated Figure.

Fig. 2 shows the system schematic of the rotary hearth furnace Direct Reduction according to the utility model one embodiment.

Fig. 3 shows the rotary hearth furnace overlooking the structure diagram according to the utility model one embodiment.

Fig. 4 is shown according to chute structure top view of the present utility model.

Fig. 5 is shown according to chute cross-sectional view of the present utility model.

Fig. 6 shows the channel distributor according to the utility model one embodiment in rotary hearth furnace circumferencial direction structural representation Figure.

Description of reference numerals：

1st, cloth area；2nd, preheating zone；3rd, middle warm area；4th, high-temperature region；5th, cooling zone；6th, dividing plate；7th, gas blowing device；8、 Stomata；9th, discharge flapper；10th, drawing mechanism；11st, chute runway；12nd, chute；13rd, blanking channel；14th, exhaust apparatus；15th, shake Dynamic dispenser；16th, fixing device；17th, feeder channel；18th, barricade.

Specific embodiment

Further describe the utility model with reference to specific embodiment, advantage of the present utility model and feature will be with Description and it is apparent.It should be understood that the embodiment is only exemplary, scope of the present utility model is not constituted and is appointed What is limited.It will be understood by those skilled in the art that can be to this reality under without departing from spirit and scope of the present utility model Modified or replaced with the details and form of new technique scheme, but these modifications or replacement each fall within guarantor of the present utility model Shield scope.

With reference to Fig. 1-Fig. 2, the utility model provides a kind of system for processing lateritic nickel ore, including pressure ball molding system S100, rotary hearth furnace direct-reduction system S200, mill ore magnetic selection system S300 and iron powder briquetting system S400；Wherein, pressure ball molding The discharging opening of system S100 is communicated with the feeding mouth of rotary hearth furnace direct-reduction system S200, rotary hearth furnace direct-reduction system S200's Discharging opening is communicated with the feeding mouth of mill ore magnetic selection system S300, the ferronickel metal powder discharging opening and iron powder of mill ore magnetic selection system S300 The feeding mouth of briquetting system S400 is communicated.

With reference to Fig. 3-Fig. 6, the drying direct-reduction rotary hearth furnace system S200 that exempts from includes that distribution device is dried and preheated S201, rotary hearth furnace preheating and direct-reduction S202, rotary hearth furnace cooling and oxidation S203, rotary hearth furnace discharging S204, its structure include Annular body of heater and rotatable ring-shaped furnace bottom, the annular body of heater are made up of inner circumferential furnace wall, periphery furnace wall and annular furnace roof, inner circumferential stove Wall is coaxially disposed with periphery furnace wall, and the inside and outside side of annular furnace roof is connected to the top of inner circumferential furnace wall and periphery furnace wall, is formed Annular furnace, described ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace；Circumferentially set gradually in the annular furnace There are cloth area 1, preheating zone 2, middle warm area 3, high-temperature region 4 and cooling zone 5, and cooling zone 5 and cloth area 1 are adjacent, cloth area 1 and pre- Separated with the barricade 18 of radial direction between hot-zone 2, between high-temperature region 4 and cooling zone 5, the lower end of the barricade 18 and ring-shaped furnace bottom it Between leave can be at least through one layer of interval of material；On the internal and external circumferential furnace wall of the preheating zone 2, middle warm area 3 and high-temperature region 4 Equipped with burner, drawing mechanism 10 is provided between the furnace bottom in cooling zone 5 and cloth area 1；Between the cloth area 1 and cooling zone 5 Furnace bottom be provided with channel distributor, and channel distributor cross section two ends are located between barricade 18；On the channel distributor The furnace roof side of side is provided with feeder channel 17；Set on the internal and external circumferential furnace wall of ring-shaped furnace bottom in described rotary hearth furnace cooling zone 5 There is gas blowing device 7；Rotary hearth furnace furnace roof above channel distributor is provided with exhaust apparatus 14.

Preferably, it is arranged on the thickness of the height higher than the material for entering cooling zone of the gas blowing device 7 of internal and external circumferential furnace wall Degree；Described drawing mechanism 10 is spiral discharging device.

The channel distributor is made up of with horizontal plane multistage the gravity chute 12 of certain angle, and each section of tilting is slipped The head and the tail of groove 12 are sequentially connected and are alternateed in circumferencial direction staggered, and every section of end of gravity chute 12 is formed with barricade 18 Blanking channel 13, discharge flapper 9 is set in the head end of the corresponding hypomere gravity chute 12 of each blanking channel 13；First section is inclined Inclined chute 12 is located at the underface of feeder channel 17, and the end of latter end gravity chute 12 is located at the top in cloth area 1；It is fixed Be fixed together for each section of gravity chute 12 and be connected with the vibra feeder 15 of furnace roof by device 16；The gravity chute 12 In sector, the radian at its two ends is consistent with the radian on rotary hearth furnace circumferencial direction, and its cross section is put down with rotary hearth furnace radial direction OK；Gravity chute 12 is by the even partition of dividing plate 6 of multiple arcs into multiple chute runways 11, and dividing plate 6 is with annular body of heater Isocentric circular arc, the height of dividing plate 6 is higher than thickness of the material in chute runway 11；Preferably, feeder channel 17 is along rotary hearth furnace footpath To width it is identical with the width of the chute runway of first paragraph gravity chute.

Preferably, the size of blanking channel 13 is 100-200mm；

Preferably, barricade 18 and the spacing distance of rotary furnace bottom are 60-150mm；

Preferably, gravity chute 12 and the angle of level are 5~15 °；

Preferably, the end perigee distance rotary furnace bottom of most latter end gravity chute 12 is highly 40~80mm.

Described gravity chute 12 is radially divided into multistage chute runway 11 in annular body of heater by the dividing plate 6 of arc, And dividing plate 6 and annular body of heater are isocentric circular arc, the height of dividing plate 6 is higher than thickness of the material on chute runway 11；

Preferably, the quantity of chute runway 11 is 2~5；

Preferably, the height of dividing plate 6 is 60~80mm；

The gravity chute 12 is by wire netting or is uniformly distributed the metallic plate of stomata 8 and is made；The stomata 8 is preferably to be justified Shape stomata, it is furthermore preferred that a diameter of 4~7mm of the circular stomata 8；

Preferably, distance of the channel distributor in circumferencial direction away from rotary hearth furnace both sides furnace wall is 100~200mm.

The method that a kind of system described in application processes lateritic nickel ore, including：

(1) aqueous green pellets is made after mixing lateritic nickel ore, reducing agent and additive in pressure ball molding system S100；

(2) aqueous green pellets steps into chute cloth by the feeder channel 17 that rotary hearth furnace is reduced directly system S200 Device, is progressively declined by the gravity chute 12 of channel distributor, and arrival chute end 12 is given to lower floor by blanking channel 13 Gravity chute 12, most latter end gravity chute 12 is reached after progressively declining, by its even feeding of blanking channel 13 to turning bottom The cloth area 1 of stove furnace bottom completes cloth；The green-ball of drying sequentially passes through rotary hearth furnace preheating zone 2, middle warm area 3, high-temperature region 4, herein During pelletizing obvious Decrepitation Phenomena will not occur, while occur reduction reaction, generate high temperature reduzate；High temperature reduction After product reaches cooling zone 5, the oxidizing gas being blown with gas blowing device 7 carry out heat exchange, play the mesh of cooling pelletizing So that hot reduzate is further reduced and quickly cooled down in cooling zone 5, while gas is preheated；Additionally, Gas injection The oxidizing gas of the injection of device 7 can also react with reduzate, and according to macroscopic property, metallic iron will be prior to metal Nickel is aoxidized, therefore will have part metals iron generation iron oxide, and metallic nickel will not be oxidized substantially, so as to improve also The nickel grade in thing is originated in, product quality is lifted.Gas after preheating is moved upwards by the effect of barricade 18, and is passed through The circular stomata 8 set on chute 12 passes to green pellets, green pellets is preheated and is dried, and further reduces pelletizing water Divide, improve pelletizing preheating temperature, drying and pre- thermogenetic flue gas and vapor are then discharged by exhaust apparatus 14.Green pellets is passed through After crossing preliminary preheating and drying, then the cloth area 1 of rotary hearth furnace is distributed into, then sequentially passes through preheating zone 2, middle warm area 3, the and of high-temperature region 4 Cooling zone 5, green pellets will not occur substantially to burst and complete direct reduction reactor in Direct Reduction, then through drawing mechanism Outside 10 discharge rotary hearth furnaces, the reduzate after being cooled down.

(3) reduzate for discharging out of the furnace is sent into mill ore magnetic selection system S300, high-grade ferronickel metal is obtained respectively Powder and mill select tailings；

(4) the ferronickel metal powder from the ferronickel metal powder outlet discharge of mill ore magnetic selection system sends into iron powder briquetting system S400, obtains high-grade ferronickel metal derby.

Scheme of the present utility model is explained below in conjunction with embodiment.It will be understood to those of skill in the art that under The embodiment in face is merely to illustrate the utility model, and should not be regarded as limiting scope of the present utility model.

Embodiment 1

Allocate the lateritic nickel ore raw ore of nickel grade 0.95%, Iron grade 27.98% into a certain amount of reduction carbon, additive swollen Aqueous green-ball, water content 10% are pressed into pressure ball molding system S100 after profit soil.

Aqueous green-ball is distributed into rotary hearth furnace by the feeder channel 17 of distribution device and is reduced directly system S200, including annular Body of heater and rotatable ring-shaped furnace bottom, the annular body of heater are made up of inner circumferential furnace wall, periphery furnace wall and annular furnace roof, inner circumferential furnace wall with Periphery furnace wall is coaxially disposed, and the inside and outside side of annular furnace roof is connected to the top of inner circumferential furnace wall and periphery furnace wall, forms annular Burner hearth, described ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace；Cloth is circumferentially disposed with the annular furnace Material area 1, preheating zone 2, middle warm area 3, high-temperature region 4 and cooling zone 5, and cooling zone 5 and cloth area 1 are adjacent, cloth area 1 and preheating zone Separated with the barricade 18 of radial direction between 2, between high-temperature region 4 and cooling zone 5, stayed between the lower end of the barricade 18 and ring-shaped furnace bottom Having can be at least through one layer of interval of material；It is equipped with the internal and external circumferential furnace wall of the preheating zone 2, middle warm area 3 and high-temperature region 4 Burner, drawing mechanism 10 is provided with the furnace bottom between cooling zone 5 and cloth area 1；It is horizontal on the cloth area 1 and cooling zone 5 Channel distributor is constituted by multistage gravity chute 12 to setting, channel distributor cross section two ends are located between barricade 18； Furnace roof side above the channel distributor is provided with feeder channel 17；In described cooling zone 5 near the inside and outside of annular furnace bottom All furnace walls are provided with gas blowing device 7；Rotary hearth furnace furnace roof above corresponding to channel distributor is provided with exhaust apparatus 14.

Channel distributor (is from top to bottom respectively chute by three sections of gravity chutes 12 for having certain angle with horizontal plane 1., chute 2., chute 3.) composition, each section of head and the tail of gravity chute 12 are sequentially connected and alternate the row that staggers in circumferencial direction Row；Every section of gravity chute end 12 forms blanking channel 13 with barricade 18, inclines in each corresponding hypomere of blanking channel 13 The head end of inclined chute 12 sets discharge flapper 9；First section chute is 1. positioned at the underface of feeder channel 17, latter end chute end 3. Top of the end positioned at cloth area 1；Fixing device 16 by three sections of gravity chutes 12 be fixed together and with the vibrating feed of furnace roof Device 15 is connected, it is ensured that pelletizing even feeding, avoid putty.

Three sections of gravity chutes 12 are in sector, the radian one on the radian and rotary hearth furnace circumferencial direction at its two ends Cause, its cross section is parallel with rotary hearth furnace radial direction；Gravity chute 12 is slipped by two even partitions of the dividing plate of arc 6 into three Groove runway 11, and dividing plate 6 and annular body of heater are isocentric circular arc, the height of dividing plate 6 is 60mm, higher than material in chute runway 11 Thickness；Preferably, the width of chute runway 11 of the feeder channel 17 along the width of rotary hearth furnace radial direction with chute 1. is identical.Incline The bottom even of formula chute 12 is distributed with the circular stomata 8 of a diameter of 4mm.

The size of blanking channel 13 is 100mm；Barricade 18 is with rotary furnace bottom at intervals of 60mm.

1. chute is 5 ° with horizontal plane angle, and 2. chute is 8 ° with horizontal plane angle, and 3. chute is with horizontal plane angle 10 °, chute lowermost end 3. is highly 40mm apart from furnace bottom, and chute outlet 3. is located on cloth area 1.Chute feeder It is 100mm along distance of the two ends of rotary hearth furnace radial direction away from rotary hearth furnace side wall.

Blanking channel 13 of the pelletizing by the chute of distribution device 3. enters rotary hearth furnace cloth area 1, sequentially passes through preheating zone 2nd, middle warm area 3, high-temperature region 4, pelletizing are 25min in this stage residence time, and the temperature of high-temperature region 4 is 1250 DEG C, the high temperature of generation Metallized pellet reaches cooling zone 5.

Cooling zone 5 is provided with gas blowing device 7, and the oxygen content of its blowing gas is 15%.Blowing gas are with high temperature also Thing contact is originated in, the part iron in reduzate is aoxidized while cooling reduzate.Gas after preheating goes upward to Distribution device, drying preheating is carried out by aqueous green pellets, and the vapor that subsequent and drying course is produced is together from exhaust apparatus 14 Discharge.Reduzate discharges rotary hearth furnace by drawing mechanism 10.

Reduzate temperature after cooling oxidation is 650 DEG C, is discharged out of the furnace by drawing mechanism 10, and send into mill ore magnetic selection System S300, iron powder briquetting system S400 is sent into after obtaining high-grade nickel iron powder, finally obtains nickelic grade ferronickel block.Wherein nickel Grade reaches 7.9%.

Embodiment 2

Allocate the lateritic nickel ore raw ore of nickel grade 2.21%, Iron grade 13.58% into a certain amount of semi-coke, additive lime Aqueous green-ball, pelletizing particle diameter 12mm, water content 15% are pressed into after stone in pressure ball molding system S100.

Aqueous green-ball is distributed into rotary hearth furnace by distribution device and is reduced directly system S200, including annular body of heater and rotatable Ring-shaped furnace bottom, the annular body of heater is made up of inner circumferential furnace wall, periphery furnace wall and annular furnace roof, and inner circumferential furnace wall is coaxial with periphery furnace wall Set, the inside and outside side of annular furnace roof is connected to the top of inner circumferential furnace wall and periphery furnace wall, form annular furnace, it is described Ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace；Cloth area 1, preheating zone is circumferentially disposed with the annular furnace 2nd, middle warm area 3, high-temperature region 4 and cooling zone 5, and cooling zone 5 and cloth area 1 are adjacent, between cloth area 1 and preheating zone 2, high-temperature region Separated with the barricade 18 of radial direction between 4 and cooling zone 5, being left between the lower end of the barricade 18 and ring-shaped furnace bottom at least to lead to Cross one layer of interval of material；Burner is housed on the internal and external circumferential furnace wall of the preheating zone 2, middle warm area 3 and high-temperature region 4, in cooling zone Furnace bottom between 5 and cloth area 1 is provided with drawing mechanism 10；Horizontally set is inclined by multistage on the cloth area 1 and cooling zone 5 Inclined chute 12 constitutes channel distributor, and channel distributor cross section two ends are located between barricade 18；On the channel distributor The furnace roof side of side is provided with feeder channel 17；In described cooling zone 5 gas is provided with the internal and external circumferential furnace wall of annular furnace bottom Body blowing device 7；Rotary hearth furnace furnace roof above corresponding to channel distributor is provided with exhaust apparatus 14.

Channel distributor (is from top to bottom respectively chute by four sections of gravity chutes 12 for having certain angle with horizontal plane 1., chute 2., chute 3., chute 4.) composition, each section of head and the tail of gravity chute 12 are sequentially connected and are alternateed in circumferencial direction It is staggered；Every section of gravity chute end 12 forms blanking channel 13 with barricade 18, corresponding in each blanking channel 13 The head end of hypomere gravity chute 12 sets discharge flapper 9；First section chute is 1. positioned at the underface of feeder channel 17, latter end chute 4. end is located at the top in cloth area 1；Be fixed together for each section of gravity chute 12 and shaken with furnace roof by fixing device 16 Dynamic dispenser 15 is connected, it is ensured that pelletizing even feeding, avoid putty.

Four sections of gravity chutes 12 are in sector, the radian one on the radian and rotary hearth furnace circumferencial direction at its two ends Cause, its cross section is parallel with rotary hearth furnace radial direction；Gravity chute 12 is slipped by three even partitions of the dividing plate of arc 6 into four Groove runway 11, and dividing plate 6 and annular body of heater are isocentric circular arc, the height of dividing plate 6 is 70mm, higher than material in chute runway 11 Thickness；Preferably, feeder channel 17 is along the width of rotary hearth furnace radial direction and the width of the chute runway of first paragraph gravity chute It is identical.Chute bottom even is distributed with the circular stomata 8 of a diameter of 5mm.

The size of blanking channel 13 is 150mm；Barricade 18 is with rotary furnace bottom at intervals of 110mm.

1. chute is 6 ° with horizontal plane angle, and 2. chute is 8 ° with horizontal plane angle, and 3. chute is with horizontal plane angle 10 °, 4. chute is 12 ° with horizontal plane angle, and chute lowermost end 4. is highly 60mm apart from furnace bottom, and chute feeder edge turns Distance of the two ends of bottom stove radial direction away from rotary hearth furnace side wall is 150mm.

Pelletizing enters rotary hearth furnace cloth area 1 by distribution device chute blanking channel 13 4., sequentially pass through preheating zone 2, Middle warm area 3, high-temperature region 4, pelletizing are 20min in this stage residence time, and the temperature of high-temperature region 4 is 1300 DEG C, and the high temperature of generation is also Originate in thing and reach cooling zone 5.

Cooling zone 5 is provided with gas blowing device 7, and the oxygen content of its blowing gas is 30%.Blowing gas are with high temperature also Thing contact is originated in, the part iron in reduzate is aoxidized while cooling reduzate.Gas after preheating goes upward to Distribution device, drying preheating is carried out by aqueous green-ball, and the vapor that subsequent and drying course is produced is together from the row of exhaust apparatus 14 Go out.Reduzate discharges rotary hearth furnace by drawing mechanism 10.

About 700 DEG C of reduzate temperature after cooling oxidation, is discharged out of the furnace, and send into ore grinding magnetic by drawing mechanism 10 System S300 is selected, iron powder briquetting system S400 is sent into after obtaining high-grade nickel ferrous metal powder, finally obtain nickelic grade ferronickel block. Wherein nickel grade reaches 12.2%.

Embodiment 3

Allocate the lateritic nickel ore raw ore of nickel grade 1.23%, Iron grade 19.87% into a certain amount of petroleum coke, additive swollen Aqueous green-ball, water content 20% are pressed into pressure ball molding system S100 after profit soil.

Aqueous green-ball is distributed into rotary hearth furnace by distribution device and is reduced directly system S200, including annular body of heater and rotatable Ring-shaped furnace bottom, the annular body of heater is made up of inner circumferential furnace wall, periphery furnace wall and annular furnace roof, and inner circumferential furnace wall is coaxial with periphery furnace wall Set, the inside and outside side of annular furnace roof is connected to the top of inner circumferential furnace wall and periphery furnace wall, form annular furnace, it is described Ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace；Cloth area 1, preheating zone is circumferentially disposed with the annular furnace 2nd, middle warm area 3, high-temperature region 4 and cooling zone 5, and cooling zone 5 and cloth area 1 are adjacent, between cloth area 1 and preheating zone 2, high-temperature region Separated with the barricade 18 of radial direction between 4 and cooling zone 5, being left between the lower end of the barricade 18 and ring-shaped furnace bottom at least to lead to Cross one layer of interval of material；Burner is housed on the internal and external circumferential furnace wall of the preheating zone 2, middle warm area 3 and high-temperature region 4, in cooling zone Furnace bottom between 5 and cloth area 1 is provided with drawing mechanism 10；Horizontally set is inclined by multistage on the cloth area 1 and cooling zone 5 Inclined chute 12 constitutes channel distributor, and channel distributor cross section two ends are located between barricade 18；On the channel distributor The furnace roof side of side is provided with feeder channel 17；In described cooling zone 5 gas is provided with the internal and external circumferential furnace wall of annular furnace bottom Body blowing device 7；Rotary hearth furnace furnace roof above corresponding to channel distributor is provided with exhaust apparatus 14.

Channel distributor (is from top to bottom respectively chute by five sections of gravity chutes 12 for having certain angle with horizontal plane 1., chute 2., chute 3., chute 4. with chute 5.) composition, each section of head and the tail of gravity chute 12 are sequentially connected and in circumferencial direction Alternate staggered；Every section of gravity chute end 12 forms blanking channel 13 with barricade 18, in each blanking channel The head end of 13 corresponding hypomere gravity chutes 12 sets discharge flapper 9；Chute is 1. positioned at the underface of feeder channel 17, chute 5. end is located at the top in cloth area 1；Be fixed together for three sections of gravity chutes 12 and shaken with furnace roof by fixing device 16 Dynamic dispenser 15 is connected, it is ensured that pelletizing even feeding, avoid putty.

The gravity chute 12 is in sector, and the radian at its two ends is consistent with the radian on rotary hearth furnace circumferencial direction, its Cross section is parallel with rotary hearth furnace radial direction；Gravity chute 12 is run by four even partitions of the dividing plate of arc 6 into five chutes Road 11, and dividing plate 6 and annular body of heater are isocentric circular arc, the height of dividing plate 6 is 80mm, higher than thickness of the material in chute runway 11 Degree；Preferably, the width of chute runway 11 of the feeder channel 17 along the width of rotary hearth furnace radial direction with chute 1. is identical.Tilting is slipped The bottom even of groove 12 is distributed with the circular stomata 8 of a diameter of 7mm.

The size of blanking channel 13 is 200mm；Barricade 18 is with rotary furnace bottom at intervals of 150mm.

1. chute is 5 ° with horizontal plane angle, and 2. chute is 7 ° with horizontal plane angle, and 3. chute is 9 ° with horizontal plane angle, 4. chute is 12 ° with horizontal plane angle, and 5. chute is 15 ° with horizontal plane angle, and chute lowermost end 5. is highly apart from furnace bottom 80mm, chute outlet 5. is located on cloth area 1.Chute feeder is along the two ends of rotary hearth furnace radial direction away from rotary hearth furnace side The distance of wall is 200mm.

Blanking channel 13 of the pelletizing by distribution device most latter end chute 5. enters rotary hearth furnace cloth area 1, sequentially passes through pre- Hot-zone 2, middle warm area 3, high-temperature region 4, pelletizing are 30min in this stage residence time, and the temperature of high-temperature region 4 is 1200 DEG C, generation High temperature reduction product reaches cooling zone 5.

Cooling zone 5 is provided with gas blowing device 7, and its blowing gas oxygen content is 40%.Blowing gas and high temperature reduction Product is contacted, and is aoxidized the part iron in reduzate while cooling reduzate.Gas after preheating goes upward to cloth Material device, drying preheating is carried out by aqueous green-ball, and the vapor that subsequent and drying course is produced is discharged from exhaust apparatus 14 together. Reduzate discharges rotary hearth furnace by drawing mechanism 10.

About 550 DEG C of reduzate temperature after cooling oxidation, is discharged out of the furnace, and send into ore grinding magnetic by drawing mechanism 10 System S300 is selected, iron powder briquetting system S400 is sent into after obtaining high-grade nickel ferrous metal powder, finally obtain nickelic grade ferronickel gold Category block.Wherein nickel grade reaches 10.5%.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term State and be necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be with Combined in an appropriate manner in any one or more embodiments or example.Additionally, in the case of not conflicting, this area Technical staff the feature of the different embodiments or example described in this specification and different embodiment or example can be entered Row is combined and combined.

Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model It is interior above-described embodiment to be changed, changed, replaced and modification.For example change chute into chain-plate type, net belt type etc..

Claims (6)

1. it is a kind of process lateritic nickel ore system, it is characterised in that including：Rotary hearth furnace is reduced directly system (S200), wherein, institute The rotary hearth furnace stated is reduced directly system (S200) includes annular body of heater and rotatable ring-shaped furnace bottom, and the annular body of heater is by inner circumferential stove Wall, periphery furnace wall and annular furnace roof composition, inner circumferential furnace wall is coaxially disposed with periphery furnace wall；Edge in the annular furnace of the rotary hearth furnace Circumference is disposed with cloth area (1), preheating zone (2), middle warm area (3), high-temperature region (4) and cooling zone (5), wherein, cooling zone (5) and cloth area (1) is adjacent, respectively by footpath between cloth area (1) and preheating zone (2), between high-temperature region (4) and cooling zone (5) To barricade (18) separate, being left between the lower end of the barricade (18) and ring-shaped furnace bottom can make what at least one of which material passed through Interval；The chute cloth that horizontally set is made up of multistage gravity chute (12) on the cloth area (1) and cooling zone (5) Device, channel distributor cross section two ends are located between the barricade (18)；Furnace roof side above the channel distributor It is provided with feeder channel (17)；Gas injection dress is provided with the internal and external circumferential furnace wall of annular furnace bottom in described cooling zone (5) Put (7)；Rotary hearth furnace furnace roof above corresponding to channel distributor is provided with exhaust apparatus (14).

2. system according to claim 1, it is characterised in that：The channel distributor has certain angle by multistage and horizontal plane Gravity chute (12) composition of degree, each section of gravity chute (12) is sequentially connected and is alternateed in circumferencial direction and stagger from beginning to end Arrangement；The end of gravity chute (12) forms blanking channel (13) with adjacent barricade (18), in each blanking channel (13) Gravity chute (12) head end of corresponding lower section is provided with discharge flapper (9)；First section gravity chute (12) is positioned at feeder channel (17) lower section, the end of latter end gravity chute (12) is located at the top of cloth area (1).

3. system according to claim 2, it is characterised in that：Each section of gravity chute (12) is entered by fixing device (16) Row is fixed, and is connected with the vibra feeder (15) of furnace roof.

4. system according to claim 2, it is characterised in that：Each section of gravity chute (12) is by multiple arcs dividing plate (6) Multistage chute runway (11) is evenly divided into, and dividing plate (6) and annular body of heater are isocentric circular arc, the height of dividing plate (6) is higher than to slip Material thickness on groove runway (11).

5. system according to claim 2, it is characterised in that：Described gravity chute (12) is by wire netting or uniform point The metallic plate of qi-emitting hole (8) is made.

6. system according to claim 1, it is characterised in that：It is arranged on the gas blowing device (7) on internal and external circumferential furnace wall Position height higher than enter cooling zone material thickness.