CN206607295U - A kind of system for handling lateritic nickel ore - Google Patents

Abstract

The utility model discloses a kind of system for handling lateritic nickel ore, the system includes：Drying system, pressure ball molding system, rotary hearth furnace direct-reduction system and dry type magnetic separation system；Wherein, the discharging opening of drying system is communicated with the feeding mouth of pressure ball molding system, and the discharging opening of pressure ball molding system is communicated with the feeding mouth that rotary hearth furnace is reduced directly system, and the discharging opening of rotary hearth furnace direct-reduction system is communicated with the feeding mouth of dry type magnetic separation system.It can realize that aqueous lateritic nickel ore green-ball is directly entered rotary hearth furnace using system of the present utility model processing lateritic nickel ore, drying, the preheating of green-ball are realized in rotary hearth furnace, original product is gone back through rotary hearth furnace direct-reduction acquisition again, by follow-up dry type magnetic separation process, high-grade ferronickel particle is obtained.

Description

A kind of system for handling lateritic nickel ore

Technical field

The system that the utility model is related to processing lateritic nickel ore, the utility model is further to the system in processing laterite Application in nickel minerals, belongs 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 needs just be distributed into rotary hearth furnace after drying, therefore must be separately provided drying plant and dried；In addition, through turning bottom The product of stove direct-reduction, also needs to discharge outside rotary hearth furnace after supercooling, and by being arranged on rotary hearth furnace cooling section Water-cooling wall is cooled down, and this also result in the waste of reduzate heat.

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

Publication No. CN1235268A Chinese utility model patent 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 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 close to the surface of workbench, and with toppling 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 (204) of the guide groove (4) 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 equipment (103), which includes to topple over for manipulation, leads 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 entrance for each passage (104) that groove is separated into.These gates are all arranged on a top for toppling over guide groove (4) and formed Chute (203) in.Apparatus above is arranged on a support frame (1) by suitable hitch (101)；This method institute The major defect of presence is can not to handle the pelletizing do not dried, it is necessary to add stoving process in balling stage, adds technique energy Consumption；Heat loss can not be increased directly using the heat entrained by flue gas simultaneously.

The Chinese utility model patent of Application No. 201510648755.7 discloses a kind of cooling being used in rotary hearth furnace The method synchronous with drying, is comprised the following steps that：First, the red ball of rotary hearth furnace is equably fallen in feed end by the first deflector chute On A2 lower floor's carrier bar, while the rotary hearth furnace green-ball is equably fallen into the upper strata chain in 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, cools 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, 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 is entered Enter falling dust room, then the dirt pocket is entered by the falling dust room, being transferred to by the dirt pocket in the air preheating system in rotary hearth furnace makes With.The red ball of rotary hearth furnace reduction product must be discharged in this method could carry out cooling treatment outside rotary hearth furnace, not only need individually to set Cooling device is put, thermal losses can be also caused；In addition, being cooled down to rotary hearth furnace reduction product using air, 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 and second bearing is in overlying relation is fixedly arranged on the bearing block；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 above the bellows；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 this method Discharge rotary hearth furnace is outer could to carry out cooling treatment, not only need to be separately provided cooling device, can also cause thermal losses；This Outside, 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, currently with rotary hearth furnace handle lateritic nickel ore technique in, the drying of green-ball and also originate in Different equipment is respectively adopted in the cooling of thing and technique is handled, and takes up an area that face is big, and technological process is long, and efficiency of utilization is low, this Not only construction cost increases, and 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

Main purpose of the present utility model is to provide a kind of system for handling lateritic nickel ore, using of the present utility model System handles lateritic nickel ore, can be directly entered rotary hearth furnace using aqueous lateritic nickel ore green-ball, green-ball is realized in rotary hearth furnace Drying, preheating, then go back original product through rotary hearth furnace direct-reduction acquisition, by follow-up dry type magnetic separation process, obtain high-grade Ferronickel particle；

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

The utility model provides a kind of system for handling lateritic nickel ore, including：Drying system, pressure ball molding system System, rotary hearth furnace direct-reduction system and dry type magnetic separation system；Wherein, the discharging opening of the drying system and the pressure ball molding system The feeding mouth of system is communicated, and the discharging opening of the pressure ball molding system is communicated with the feeding mouth that the rotary hearth furnace is reduced directly system, The discharging opening of the rotary hearth furnace direct-reduction system is communicated with the feeding mouth of the dry type magnetic separation system.

The rotary hearth furnace direct-reduction system includes distribution device drying and preheating, rotary hearth furnace preheating and direct-reduction, turned 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 between cloth area and preheating zone, between high-temperature region and cooling zone with the barricade of radial direction, at this Left between the lower end of barricade and ring-shaped furnace bottom can at least through one layer of material interval；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 With channel distributor is laterally set on cooling zone, channel distributor cross section two ends are located between barricade；In the chute cloth The side of furnace roof above glassware is provided with feeder channel；Set in described cooling zone on the internal and external circumferential furnace wall of ring-shaped furnace bottom There is gas blowing device；Rotary hearth furnace furnace roof above channel distributor is provided with exhaust apparatus；

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

The channel distributor is made up of multistage with horizontal plane the gravity chute of certain angle, each section of gravity chute Head and the tail are sequentially connected and are alternateed in circumferencial direction staggered, and every section of gravity chute end leads to barricade formation blanking Road, discharge flapper is set in the head end of the corresponding hypomere gravity chute of each blanking channel；First section gravity chute is located at The underface of feeder channel, the end of latter end gravity chute is located at the top in cloth area；Fixing device slips each section of tilting Groove is fixed together and is connected with the vibra feeder of furnace roof；The gravity chute is in sector, and the radian at its two ends is with turning Radian on the stove circumferencial direction of bottom is consistent, and its cross section is parallel with rotary hearth furnace radial direction.

It is preferred that, width of the feeder channel along rotary hearth furnace radial direction is identical with the width of first paragraph gravity chute；

It is preferred that, 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 accumulate.

It is preferred that, the spacing distance of barricade and rotary furnace bottom is 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 is to height The gas after other zone atmospheres, and heat exchange is not interfered with while warm reduzate cooling can up drying and preheating green-ball； In addition, 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.

It is preferred that, the angle of gravity chute and level is 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.

It is preferred that, 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 excessive, 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.

It is preferred that, 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 can not enter Enter.

It is preferred that, the height of dividing plate is 60~80mm, while its height is higher by least 20mm than the bed of material, thus be may be such that The feed pelletizing of section 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 the contact surface of gas and green pellets is small, shadow Its drying effect is rung, hole diameter is excessive, and green pellets can leak down or be stuck in stomata.

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

Further improvement of the utility model to channel distributor, sets multiple radiant tubes between gravity chute, The radiant tube set between gravity chute is evenly arranged along rotary hearth furnace radial direction, and is traversed between internal and external circumferential furnace wall； The radiation temperature of the radiant tube is 200~1000 DEG C, to realize preheating and drying to green pellets in top, lower section chute.

It is preferred that, the radiation temperature of the radiant tube is 200~1000 DEG C, if temperature is too low, it is impossible to play the effect of drying Really；If temperature is too high, it can influence to radiate tube lifetime.

It is preferred that, the radiant tube temperature between first section gravity chute and second segment gravity chute is 200~500 DEG C, Thereafter radiant tube temperature is 500~1000 DEG C.Thus, radiant tube can be further dried and be preheated to green pellets, and with That radiant tube radiation temperature is top-down to be gradually risen, green pellets is first through low temperature, middle temperature, then through high temperature drying and preheating, this Sample can effectively improve the drying of pelletizing and the pre- thermal efficiency, while farthest reducing the explosion of pelletizing.

It is preferred that, same layer radiant tube distance is 500~900mm, if apart from excessive, it is impossible to needed for green pellets is heated to Temperature；If apart from too small, the waste of heat can be caused.

The method that lateritic nickel ore is handled using the utility model system, including：

(1) lateritic nickel ore, reducing agent and additive are dried to certain moisture using drying system；

(2) aqueous green pellets is made in pressure ball molding system after the material of drying is well mixed；

(3) feeder channel that aqueous green pellets is reduced directly system by rotary hearth furnace is distributed into channel distributor, by slipping The gravity chute of groove distributing device progressively declines；Wherein, high temperature of the gas of gas blowing device injection with entering cooling zone Reduzate carries out heat exchange and produces preheating gas, up preheating gas and the radiant tube production being arranged in channel distributor Raw radiations heat energy carries out heating, drying to the green-ball progressively declined in gravity chute jointly and is preheated pelletizing；In advance The blanking channel for the most latter end chute that the pelletizing of heat passes through channel distributor reaches rotary hearth furnace cloth area, sequentially passes through rotary hearth furnace pre- Reduction reaction occurs for hot-zone, middle warm area, high-temperature region, obtains the reduzate of high temperature；The reduzate of high temperature enters cooling zone, with The oxidizing gas contact of Gas injection gas device injection, the reduzate of high temperature is cooled down and preheating gas are generated, in gear Preheating gas go upward to distribution device and dry aqueous green pellets in the presence of wall；The oxidizing gas of injection is by reduzate simultaneously In part metals iron oxidation；Reduzate after cooling is discharged out of the furnace by drawing mechanism；

(4) reduzate discharged out of the furnace is sent into dry type magnetic separation system, high-grade ferronickel particle is obtained respectively and non- Magnetic slag.

Wherein, high temperature reduction product is reached behind cooling zone, and the oxidizing gas sprayed with gas blowing device is contacted, a side Heat exchange occurs for face, and high temperature reduction product is by gas cooling, and the gas preheated continues up for drying aqueous green pellets； Another aspect oxidizing gas reacts with reduzate, according to macroscopic property, and metallic iron will occur prior to metallic nickel Oxidation, therefore part metals iron generation iron oxide will be had, and metallic nickel will not be oxidized substantially, so as to improve reduzate In nickel grade, product quality lifted.

It is preferred that, in step (1) aqueous 25% after lateritic nickel ore drying, aqueous 10% after reduction coal and additive drying； If moisture is too high after drying, pelletizing can not be dried to rotary hearth furnace requirement is met, in reduction process in distribution device It can burst；If moisture is too low after drying, flue gas heat can be wasted.

It is preferred that, the moisture of aqueous green pellets described in step (2) is no more than 15%；If moisture is too high, nothing Method meets rotary hearth furnace production requirement, can be burst in reduction process.

It is preferred that, the gas that gas blowing device is blown in step (3) is the oxidizing gas of oxygen content 15~40%；Spray It is anti-that while the cooling of high temperature reduction product is accelerated, also with the metal in reduzate oxidation can occur for the oxidizing gas blown 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.

It is preferred that, the radiation temperature of radiant tube is 200~1000 DEG C in step (3)；Produced heat smoke and vapor Discharged by exhaust apparatus outside rotary hearth furnace, the heat smoke discharged, which is sent to leading portion drying system, is used for material drying.

The method of the utility model system processing lateritic nickel ore can be directly entered using aqueous lateritic nickel ore green-ball to be turned Bottom stove, realizes drying, the preheating of green-ball in rotary hearth furnace, then goes back original product through rotary hearth furnace direct-reduction acquisition, by subsequently doing Formula magnetic separation process, obtains high-grade ferronickel particle.

Main beneficial effect using the utility model system processing lateritic nickel ore includes：

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

(2) be conducive to obtaining the higher nickel iron metal granules of nickel grade, improve product quality.

Brief description of the drawings

Fig. 1 shows the stream for the system and method that lateritic nickel ore is handled according to the rotary hearth furnace of the utility model one embodiment Journey schematic diagram.

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、 Circular stomata；9th, discharge flapper；10th, drawing mechanism；11st, chute runway；12nd, chute；13rd, blanking channel；14th, radiant tube；15、 Vibra feeder；16th, fixing device；17th, feeder channel；18th, barricade；19th, exhaust apparatus.

Embodiment

Further describe the utility model with reference to specific embodiment, advantage and feature of the present utility model 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 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 substitutions each fall within guarantor of the present utility model Protect scope.

With reference to Fig. 1-Fig. 2, the utility model provides a kind of system for handling lateritic nickel ore, drying system S100, pressure ball Formation system S200, rotary hearth furnace direct-reduction system S300 and dry type magnetic separation system S400；Wherein, the drying system S100 Discharging opening is communicated with the feeding mouth of the pressure ball molding system S200, the discharging opening of the pressure ball molding system S200 with described turn Bottom stove direct-reduction system S300 feeding mouth is communicated, the discharging opening and the dry type of the rotary hearth furnace direct-reduction system S300 Magnetic separation system S400 feeding mouth is communicated；Wherein, the heat smoke that the drying system can be discharged using rotary hearth furnace exhaust apparatus Carry out drying materials.

With reference to Fig. 3-Fig. 6, the rotary hearth furnace direct-reduction system S300, which includes distribution device, to be dried and preheats (S301), turn Bottom stove preheating and direct-reduction (S302), rotary hearth furnace cooling and oxidation (S303), rotary hearth furnace discharging (S304), its structure include ring Shape 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 It is coaxially disposed with periphery furnace wall, the inside and outside side of annular furnace roof is connected to the top of inner circumferential furnace wall and periphery furnace wall, forms ring Shape burner hearth, described ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace；Circumferentially it is disposed with the annular furnace 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 preheating Separated between area 2, between high-temperature region 4 and cooling zone 5 with the barricade 18 of radial direction, between the lower end of the barricade 18 and ring-shaped furnace bottom Leave can at least through one layer of material interval；Filled on the internal and external circumferential furnace wall of the preheating zone 2, middle warm area 3 and high-temperature region 4 There is burner, drawing mechanism 10 is provided with the furnace bottom between 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 be located at barricade 18 between；On the channel distributor The side that the furnace roof of side corresponds to cooling zone 5 is provided with feeder channel 17；In described rotary hearth furnace cooling zone 5 close to ring-shaped furnace bottom Internal and external circumferential furnace wall be provided with gas blowing device 7；Rotary hearth furnace furnace roof above channel distributor is provided with exhaust apparatus 19.

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

The channel distributor is made up of multistage with horizontal plane the gravity chute 12 of certain angle, and each section of tilting is slipped Groove head and the tail be sequentially connected and alternateed in circumferencial direction it is staggered, every section of end of gravity chute 12 with the formation of barricade 18 Expect passage 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 tilted Formula 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；Fixed dress 16 are put each section of gravity chute 12 is fixed together and with the vibra feeder 15 of furnace roof is connected；The gravity chute 12 is equal In sector, the radian at its two ends is consistent with the radian on rotary hearth furnace circumferencial direction, and its cross section is parallel with rotary hearth furnace radial direction； Gravity chute 12 is by the even partition of dividing plate 6 of multiple arcs into multiple chute runways 11, and dividing plate 6 and annular body of heater are concentric Circular arc, the height of dividing plate 6 is higher than thickness of the material in chute runway 11；It is preferred that, feeder channel 17 is along rotary hearth furnace radial direction Width is identical with the width of the chute runway of first paragraph gravity chute.

It is preferred that, the size of blanking channel 13 is 100-200mm；

It is preferred that, the spacing distance of barricade 18 and rotary furnace bottom is 60-150mm；

It is preferred that, gravity chute 12 and the angle of level are 5~15 °；

It is preferred that, 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；

It is preferred that, the quantity of chute runway 11 is 2~5；

It is preferred that, 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 justify Shape stomata, it is furthermore preferred that a diameter of 4~7mm of the circular stomata 8；

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

Further improvement of the utility model to channel distributor, sets multiple radiant tubes between gravity chute 14, the radiant tube 14 set between gravity chute 12 is evenly arranged along rotary hearth furnace radial direction, and is traversed in internal and external circumferential stove Between wall；

It is preferred that, the radiation temperature of the radiant tube 14 is 200~1000 DEG C, if temperature is too low, it is impossible to play drying Effect；If temperature is too high, it can influence to radiate tube lifetime；

It is preferred that, the temperature of radiant tube 14 between first section gravity chute 12 and second segment gravity chute 12 for 200~ 500 DEG C, the temperature of radiant tube 14 thereafter is 500~1000 DEG C.Thus, radiant tube 14 green pellets can be further dried and Preheating, and gradually risen as radiant tube radiation temperature is top-down, green pellets is first through low temperature, middle temperature, then through high temperature drying And preheating, the drying of pelletizing and the pre- thermal efficiency can be so effectively improved, while farthest reducing the explosion of pelletizing；

It is preferred that, same layer radiant tube 14 is apart from for 500~900mm.

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

(1) lateritic nickel ore, reducing agent and additive are dried to certain moisture using drying system material S100；

(2) aqueous green pellets is made in pressure ball molding system S200 after the material dried to certain moisture is well mixed；

(3) feeder channel 17 that aqueous green pellets is reduced directly system S300 by rotary hearth furnace steps into chute cloth Device, is progressively declined by the gravity chute 12 of channel distributor, is reached the end of gravity chute 12 and is given by blanking channel 13 To lower floor's gravity chute 12, most latter end gravity chute 12 is reached after progressively declining, passes through its even feeding of blanking channel 13 Cloth is completed to the cloth area 1 of rotary furnace bottom；The green-ball of drying sequentially passes through rotary hearth furnace preheating zone 2, middle warm area 3, high-temperature region 4, obvious Decrepitation Phenomena will not occur for pelletizing in the process, while occurring reduction reaction, generate the reduzate of high temperature.It is high Warm reduzate is reached behind cooling zone 5, and heat exchange is carried out with the oxidizing gas that gas blowing device 7 is blown, and plays cooling also Originate in the purpose of thing so that hot reduzate is further cooled down in cooling zone 5, while gas is preheated；In addition, Gas injection The oxidizing gas that device 7 is blown 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.Preheating gas are moved upwards by the effect of barricade 18, and by slipping The circular stomata 8 set on groove 12 passes to aqueous green pellets, and radiant tube 14 is also radiated to aqueous green-ball by the heat of generation Group, is preheated and is dried to aqueous green pellets jointly, further reduction pelletizing moisture, improve pelletizing preheating temperature, dry with Pre- thermogenetic flue gas and vapor are then discharged by exhaust apparatus 19, and are sent to leading portion drying system S100 for drying object Material.Green pellets is after preliminary preheating and drying, then is distributed into the cloth area 1 of rotary hearth furnace, then sequentially passes through preheating zone 2, middle warm area 3rd, high-temperature region 4 and cooling zone 5, green pellets will not occur substantially to burst and complete direct reduction reactor, then pass through in reduction process Outside the discharge rotary hearth furnace of drawing mechanism 10, the reduzate after being cooled down.

(4) reduzate discharged out of the furnace is sent into dry type magnetic separation system (S400), high-grade ferronickel is obtained respectively Grain and non magnetic slag.

Thus, green pellets is without individually passing through drying device, you can realize that green-ball is directly distributed into rotary hearth furnace and carried out directly also Original, while hot reduzate is cooled down and its heat is comprehensively utilized, improves the efficiency of utilization of rotary hearth furnace, reduces Equipment investment and floor space, further reduce production cost.

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

Certain lateritic nickel ore, nickel grade 0.78%, Iron grade 30.14%, aqueous 30%；Certain reduction coal, fixed carbon 70%, contains Water 5%；Certain lime stone, CaO content 50%, aqueous 3%.

Lateritic nickel ore is dried to aqueous 23% by drying system S100, with reduction coal and lime stone according to a certain percentage Aqueous green-ball, water content 10% are made by pressure ball molding system S200 after well mixed.

Aqueous green-ball is distributed into rotary hearth furnace by the feeder channel 17 of distribution device and is reduced directly system S300, 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 Expect 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 between 2, between high-temperature region 4 and cooling zone 5 with the barricade 18 of radial direction, stayed between the lower end of the barricade 18 and ring-shaped furnace bottom Have can at least through one layer of material interval；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 Drawing mechanism 10 is provided with burner, 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 close to 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 19.

Channel distributor (is respectively from top to bottom 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 and the formation blanking channel 13 of barricade 18, incline in each corresponding hypomere of blanking channel 13 The head end of inclined chute 12 sets discharge flapper 9；1. first section chute is located at the underface of feeder channel 17, the end of latter end chute 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, radian and the radian one on 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 the even partition of dividing plate 6 of two arcs 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；It is preferred that, the width of chute runway 11 of width of the feeder channel 17 along rotary hearth furnace radial direction with chute 1. is identical.Tilt A diameter of 4mm circular stomata 8 is distributed with the bottom even of formula chute 12.

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 °, the lowermost end of chute 3. is highly 40mm apart from furnace bottom.Two ends of the chute feeder along rotary hearth furnace radial direction are away from turning bottom The distance of furnace sidewall is 100mm.Multiple radiant tubes 14 are set between gravity chute 12, set between gravity chute 12 Radiant tube 14 be evenly arranged along rotary hearth furnace radial direction, and traverse between internal and external circumferential furnace wall；

Wherein, with the centre-to-centre spacing of layer radiant tube 14 be 500mm, chute 1. with chute 2. between 200 DEG C of 14 temperature of radiant tube, Chute 2. with chute 3. between 500 DEG C of 14 temperature of radiant tube.

By the chute of distribution device, 3. blanking channel 13 enters rotary hearth furnace cloth area 1 to pelletizing, 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 1430 DEG C.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 15%.Blowing gas and high temperature are also Thing contact is originated in, the part metals iron in product is aoxidized while cooling reduzate.Gas after preheating is gone upward to Distribution device, the heat radiated with radiant tube 14 together carries out drying preheating to aqueous green pellets, is then produced with drying course Vapor reclaimed together from exhaust apparatus 19, and send into leading portion drying system S100 be used for material drying.Reduzate passes through Drawing mechanism 10 discharges rotary hearth furnace.

The reduzate of discharge passes through dry type magnetic separation process S400, obtains high-grade ferronickel particle and non magnetic slag.Its The nickel grade of middle ferronickel particle is up to 5.05%.

Embodiment 2

Certain lateritic nickel ore, nickel grade 2.9%, Iron grade 13.17%, aqueous 22%；Certain reduction coal, fixed carbon 76%, contains Water 12%.

Reduction coal is dried to aqueous 8% by drying system S100, and mixed according to a certain percentage with lateritic nickel ore Aqueous green-ball, water content 15% are made by pressure ball system S200 after even.

Aqueous green-ball is distributed into rotary hearth furnace by distribution device and is reduced directly system S300, 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 and periphery furnace wall are coaxial 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 are 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 between 4 and cooling zone 5 with the barricade 18 of radial direction, leave and can at least lead between the lower end of the barricade 18 and ring-shaped furnace bottom Cross the interval of one layer 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；Laterally set and 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；Gas is provided with the internal and external circumferential furnace wall of annular furnace bottom in described cooling zone 5 Body blowing device 7；Rotary hearth furnace furnace roof above corresponding to channel distributor is provided with exhaust apparatus 19.

Channel distributor (is respectively from top to bottom 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 and the formation blanking channel 13 of barricade 18, it is corresponding in each blanking channel 13 The head end of hypomere gravity chute 12 sets discharge flapper 9；1. first section chute is located at the underface of feeder channel 17, latter end chute 4. end is located at the top in cloth area 1；Each section of gravity chute 12 is fixed together 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, radian and the radian one on 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 the even partition of dividing plate 6 of three arcs 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；It is preferred that, the width of width of the feeder channel 17 along rotary hearth furnace radial direction and the chute runway of first paragraph gravity chute It is identical.A diameter of 5mm circular stomata 8 is distributed with chute bottom even.

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 the lowermost end of chute 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.

With the centre-to-centre spacing of layer radiant tube 14 be 700mm, chute 1. with chute 2. between 300 DEG C of 14 temperature of radiant tube, chute 2. with chute 3. between 500 DEG C of 14 temperature of radiant tube, chute 3. with chute 4. between radiation do 700 DEG C of 14 temperature.

Pelletizing enters rotary hearth furnace cloth area 1 by the blanking channel 13 of distribution device latter end chute 4., sequentially passes through preheating Area 2, middle warm area 3, high-temperature region 4, pelletizing are 35min in this stage residence time, and the temperature of high-temperature region 4 is 1400 DEG C.The height of generation Warm reduzate reaches 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 and high temperature are also Thing contact is originated in, the part metals iron in product is aoxidized while cooling reduzate.Gas after preheating is gone upward to Distribution device, the heat radiated with radiant tube 14 together carries out drying preheating to aqueous green-ball, what subsequent and drying course was produced Vapor is reclaimed from exhaust apparatus 19 together, and sends into leading portion drying system for material drying.Reduzate is filled by discharging Put 10 discharge rotary hearth furnaces.

The reduzate of discharge passes through dry type magnetic separation process S400, obtains high-grade ferronickel particle and non magnetic slag.Its The nickel grade of middle ferronickel particle is up to 7.1%.

Embodiment 3

Certain lateritic nickel ore, nickel grade 1.44%, Iron grade 18.2%, aqueous 20%；Certain reduction coal, fixed carbon 82%, contains Water 5%.

Numerical value is required because material moisture is less than, therefore does not enter drying system S100, directly mixes equal according to a certain percentage Aqueous green-ball, water content 20% are made by pressure ball molding system S200 after even.

Aqueous green-ball is distributed into rotary hearth furnace by distribution device and is reduced directly system S300, 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 and periphery furnace wall are coaxial 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 are 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 between 4 and cooling zone 5 with the barricade 18 of radial direction, leave and can at least lead between the lower end of the barricade 18 and ring-shaped furnace bottom Cross the interval of one layer 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；Laterally set and 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；Gas is provided with the internal and external circumferential furnace wall of annular furnace bottom in described cooling zone 5 Body blowing device 7；Rotary hearth furnace furnace roof above corresponding to channel distributor is provided with exhaust apparatus 19.

Channel distributor (is respectively from top to bottom 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 and the formation blanking channel 13 of barricade 18, in each blanking channel The head end of 13 corresponding hypomere gravity chutes 12 sets discharge flapper 9；1. chute is located at the underface of feeder channel 17, chute 5. end is located at the top in cloth area 1；Three sections of gravity chutes 12 are fixed together 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 the even partition of dividing plate 6 of an arc into two 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；It is preferred that, the width of chute runway 11 of width of the feeder channel 17 along rotary hearth furnace radial direction with chute 1. is identical.Tilting is slipped A diameter of 7mm circular stomata 8 is distributed with the bottom even of groove 12.

The size of blanking channel 13 is 200mm；Barricade 18 is with rotary furnace bottom at intervals of 150mm.1. and horizontal plane chute Angle is 5 °, and 2. chute is 7 ° with horizontal plane angle, and 3. chute is 9 ° with horizontal plane angle, and 4. chute is with horizontal plane angle 12 °, 5. chute is 15 ° with horizontal plane angle, and the lowermost end of chute 5. is highly 80mm apart from furnace bottom, and the outlet of chute 5. is located at On cloth area 1.Distance of two ends of the chute feeder along rotary hearth furnace radial direction away from rotary hearth furnace side wall is 200mm.

Multiple radiant tubes 14 are set between gravity chute 12, the edge of radiant tube 14 set between gravity chute 12 Rotary hearth furnace radial direction is evenly arranged, and is traversed between internal and external circumferential furnace wall；

Wherein, with the centre-to-centre spacing of layer radiant tube 14 be 900mm, chute 1. with chute 2. between 500 DEG C of 14 temperature of radiant tube, Chute 2. with chute 5. between 900 DEG C of 14 temperature of radiant tube.

Pelletizing enters rotary hearth furnace cloth area 1 by the blanking channel 13 of distribution device most latter end chute 5., sequentially passes through pre- Hot-zone 2, middle warm area 3, high-temperature region 4, pelletizing are 15min in this stage residence time, and the temperature of high-temperature region 4 is 1480 DEG C.Generation High temperature reduction product reaches cooling zone 5.

Cooling zone 5 is provided with gas blowing device 7, and the oxygen content of its blowing gas is 40%.Blowing gas and high temperature are also Thing contact is originated in, the part metals iron in product is aoxidized while cooling reduzate.Gas after preheating is gone upward to Distribution device, the heat radiated with radiant tube 14 together carries out drying preheating to aqueous green-ball, what subsequent and drying course was produced Vapor is reclaimed from exhaust apparatus 19 together, and sends into leading portion drying system S100 for material drying.Reduzate is by going out Expect the discharge rotary hearth furnace of device 10.

The reduzate of discharge passes through dry type magnetic separation system S400, obtains high-grade ferronickel particle and non magnetic slag.Its The nickel grade of middle ferronickel particle is up to 9.65%.

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 the 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.Moreover, specific features, structure, material or the feature of description can be with Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area Technical staff the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification 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.Such as changing chute into chain-plate type, net belt type.

Claims (6)

1. a kind of system for handling lateritic nickel ore, it is characterised in that including：Rotary hearth furnace direct-reduction system (S200)；

Wherein, described rotary hearth furnace direct-reduction system (S200) includes 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 coaxially disposed with periphery furnace wall；

Circumferentially be disposed with annular furnace between annular body of heater and rotatable ring-shaped furnace bottom 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) are adjacent,

Respectively by the barricade (18) of radial direction point between cloth area (1) and preheating zone (2), between high-temperature region (4) and cooling zone (5) Every leaving the interval that can pass through at least one layer of material between the lower end of the barricade (18) and ring-shaped furnace bottom；

The channel distributor being made up of multistage gravity chute (12) is laterally set on the cloth area (1) and cooling zone (5), Channel distributor cross section two ends are located between the barricade (18)；

Furnace roof side above the channel distributor is provided with feeder channel (17).

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 alternateed in circumferencial direction and staggered from beginning to end Arrangement.

3. system according to claim 2, it is characterised in that：Gravity chute (12) is equal by the dividing plate (6) of multiple arcs It is even to be separated into multiple chute runways (11), and dividing plate (6) and annular body of heater are isocentric circular arc, the height of dividing plate (6) is higher than material Thickness in chute runway (11).

4. system according to claim 1, it is characterised in that：Along rotary hearth furnace radial direction between gravity chute (12) Even circumferential interval is uniformly arranged one layer of radiant tube (14), and the radial direction axially along annular body of heater of radiant tube (14) is set.

5. system according to claim 1, it is characterised in that：The gas blowing device (7) being located on internal and external circumferential furnace wall Highly it is higher than the thickness for entering cooling zone material.

6. system according to claim 1, it is characterised in that：Each section of gravity chute is in sector, and its radian is with turning bottom Radian on stove circumferencial direction is consistent, and its cross section is parallel with rotary hearth furnace radial direction.