CN1676205A

CN1676205A - Rotary spray granulating apparatus and spray packaging granulating method

Info

Publication number: CN1676205A
Application number: CN 200510052328
Authority: CN
Inventors: 孔亦周; 唐昆斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-02-06
Filing date: 2005-02-06
Publication date: 2005-10-05
Anticipated expiration: 2025-02-06
Also published as: CN100358620C

Abstract

The present invention relates to a chemical palletizing equipment and its method. In particular, it is a method for pelletizing high-viscosity melt and coating small-diameter granule so as to make its grain size be enlarged. Said invention is a rotary spray-type palletizing equipment, said equipment is formed from the following components: palletizing spray disk, hollow main shaft, feeding box, driving mechanism, material inlet and material outlet, etc.

Description

Rotary sprinkling pelleting device and spray parcel comminution granulation

Technical field:

The present invention relates to a kind of device and method of chemical industry granulation, be particularly useful for the granulation of high-viscosity melt and small diameter particles is wrapped up the method that its sphere diameter is grown up, belong to chemical industry granulation equipment field.

Background technology:

Many mature technique are arranged aspect fertilizer granulation at present, are tower melt method sprinkling pelletings such as adopting maximum in traditional urea granulating process; What employing was maximum in traditional composite fertilizer's granulating process is pellet granulation or the like.

Usually we with fusing point below 300 ℃, its material characteristics is at the low melting point chemical material that is solid-state under the normal temperature state, is in a liquid state and has flowable under molten condition, to directly enter in refrigerant with the form of drop the material of liquid state with specialized apparatus after its fusion of heating, this refrigerant can be gas or also can be and the immiscible liquid of material, this drop is contacting the spherical particles that the back cooling is shrunk to solid with refrigerant, this technology is called fused mass granulating technique.

In tower melt method sprinkling pelleting technology, the main prilling spry sprinkling pelleting that adopts, generally be the prilling spry of a rotation to be installed at the top of granulation tower or several static prilling spries are installed at the top of granulation tower, the machine driving form of the prilling spry of rotation has two kinds of single rotating granulation and differential rotating granulations.No matter be the prilling spry of rotation or static prilling spry, no matter also comminutor is single rotational structure or differential rotational structure, what the final outlet of its fused solution still all adopted so far is the round jet orifice structure of minor diameter of most amounts.

Because the restriction of granulation tower height, because the factor of fused raw material self is such as his viscosity, mobile, the restriction of surface tension or the like physicochemical property, aspect the composite fertilizer melt granulation because the restriction of the physical conditions such as physical dimension of the ratio of factor such as the solid suspension in its fused solution of fused raw material self and solid suspension, at present will be subjected to certain restriction, such as in the physical dimension that has just determined its particle aspect the height of granulation tower with the granular chemical fertilizer of tower melt method sprinkling pelleting explained hereafter, again such as just having increased its production difficulty and cost etc. in the manufacture process requirement to the fusion slurries aspect the composite fertilizer melt granulation.That is to say, because above-mentioned restriction, so may produce oarse-grained chemical fertilizer hardly with the tower melt method sprinkling pelleting method of tradition height; Again because the solid chemical reaction thing greater than the spray orifice eye diameter that produces such as the solid suspended particle that exceeds technological requirement in the fibre object of woven bag and the solid material and when the high-temperature fusion is arranged in pulping process unavoidably, therefore replacing that just must be regular and clean prilling spry.

The prilling spry of the tower rotary spray technology of traditional granulation has following characteristics:

1, since in the commercial process high viscosity characteristic of fused materials self exist the factor of many shower nozzle eyelets that results in blockage in the production system in addition, so the work of cleaned and changed prilling spry is inevitable and be frequent relatively.

2, because composite chemical fertilizer production is the agricultural chemical industry of the reprocessing type of a low value-added extensive style, certainly will strengthen its production cost to the excessive demand of its production technology, yet the related process that loosens it requires and will speed up the accident generation that causes stopping up the prilling spry spray orifice, so both at home and abroad the tower rotary sprinkling pelleting technology of melt composite fertilizer is all adopted at present and sieve and regular technological measures such as cleaned and changed prilling spry normally carrying out in the hope of enterprise's production raw material are strict.

3, the fused solution that is used for granulation will be by liquid state to solid-state transformation after its melt temperature descends, himself viscosity change also descends with temperature and sharply strengthens, for guaranteeing the process flowability of fused solution, just necessarily require prilling spry that certain temperature is arranged, traditional technology is with steam prilling spry thoroughly to be blown down guaranteeing not having residual material in prilling spry immediately after with steam the prilling spry that is about to work being carried out abundant preheating and stops granulation, so the consumption of steam is big and along with the increase that is directly proportional of the frequency of replacing prilling spry.

4, the size of particle diameter depends on the height of granulation tower, facts have proved height with existing urea prilling tower, with traditional rotary spray technology produce multi-component composite fertilizer hardly may the output average diameter greater than 3 millimeters particle, because the still impossible cooling curing fully of particle its kernel in the landing process that diameter is big slightly is promptly broken and in blocks with other finished particle adhesions as egg after landing.Therefore if want to make the more particle of large ball diameter, way has only height that strengthens granulation tower or the heat exchange ventilation that increases granulation tower, yet above-mentioned way will certainly be brought the rapid increase of construction cost and production run expense, because the relation that particle volume increases is the relation of cube geometry.

Summary of the invention:

Purpose of design: avoid the weak point in the background technology, the one, solve because the deficiency of the obstruction shower nozzle eyelet that the high viscosity characteristic of fused materials self is brought; The 2nd, need not to change shower nozzle in the industrial production; The 3rd, change the insulation construction of shower nozzle, guarantee the flowability of liquation; The 4th, cutting down the consumption of energy, under the prerequisite of granulation tower height, producing particle greater than 3 millimeters.

Design: the application is that be called " rotation spray disk technology ", application number in the applicant's patent applied for name be on 0410025815.1 the basis, to realize by further improvement.The application is in order to overcome the problem that fused materials easily stops up the prilling spry eyelet, provide a kind of rotation to spray design: when the material of fusion is touching on the heated spray dish end face that horizontally rotates without spray orifice, because the centrifugal action liquation will slide to spray dish outer rim rapidly when rotating with the spray dish, and be tangential direction disengaging spray disk body.The fused solution that broken away from spray dish outer rim this moment is filminess, because causes such as its movement velocity and liquation self surface tension, film is torn into the drop of certain volume rapidly, and drop shrinks the solid particle that is cooled to spherical shape in the process that contacts landing with air.The application will rotate spray dish granulating technique, electric-heating technology, current collection slip ring etc. just and combine and comprehensively become a brand-new technology scheme: directly granulation can make the granule as crystal seed coat device of growing up and the method for producing larger-diameter chemical granule product with lower granulation tower again.

The application's main feature is: the one, and fused solution is motion and break away from its rotary body on the end face of an open heated horizontal rotary body, owing to do not have the constraint of eyelet, so also just do not have the blocked problem of eyelet.Because it is compound for two or more such materials, before with its fusion almost be difficult to in it solid insoluble and the physical dimension of impurity limit fully, a kind of solid calcified material greater than technological requirement of chemical reaction generation also can take place in the raw material as the phosphorus ammonium when being heated to uniform temperature still more, in addition because composite fertilizer's production is a reprocessing type technology, raw material is many to enter the processing place with the bag packaged form, so also can't avoid fully entering fusing system such as impurity such as packing material fibers in melting process that raw material is unpacked.The basic difference of the granulating principle of the prilling spry of spray dish structure of the present invention and the traditional tower rotary spray technology of granulation just is: the prilling spry fused solution of traditional tower rotary spray technology is to eject from the eyelet of prilling spry, and granulation spray dish fused solution then is to shed out from the open end face of spray dish; The 2nd, owing to do not have the blocked problem of prilling spry, so the production technology index has been relaxed some with regard to relative; Owing to do not have the blocked problem of prilling spry, so absolutely do not need this operation sequence of cleaned and changed prilling spry; Only above-mentioned two its production costs of improvement just will descend thereupon; The 3rd, because fused solution is to move on an open rotary body, so relative thinner of the fused materials liquid film on the spray dish end face, cooling effect when in addition spraying the disc spins motion, the thermal capacity that only depends on fused solution self obviously can not the desired temperature of balancing processing, in addition, during initial feed high-temperature fusion liquid as touch be normal temperature spray dish the time then can coacervation immediately reduce its flowability owing to the huge temperature difference, moreover equipment still needs enough temperature after stopping and allows the defective material in the system all flow to end through the spray dish.In order to guarantee that liquation has good flowing property, so must heat and its heating-up temperature is controlled to the spray dish.Traditional method is to utilize steam that nodulizer is heated, the overwhelming majority has directly just been overflowed from eyelet enter the prilling spry that spreads all over eyelet when steam after, the extremely low and steam condensate (SC) that overflow of heat exchange efficiency will drop onto the granulation tower bottom and contact with finished particle, this phenomenon is very disadvantageous for the composite fertilizer of deliquescence very easily, however, traditional prilling still can only be with the method for this heating.And metal spray dish structure of the present invention just can be come its heating with electric heater, it is the technology that has adopted the rotation current collection to the heating of metal spray dish and to the key that its heating-up temperature is controlled that the present invention utilizes the tabular electric heater of annulus, and the technology of rotation current collection is existing mature technology.Current collecting equipment can adopt the sliding ring type current collecting equipment of being made up of collector ring and carbon brush holder also can adopt more senior mercury conducting slip ring device, collector ring is fixed on the upper end of main shaft, have four road slip rings, wherein the twice slip ring is connected with electric heating plate, the twice slip ring is connected with temperature sensor in addition, and the cable that connects them passes from the center of main shaft.This technology has replaced the way of traditional handicraft with the Steam Heating nodulizer, has promptly save steam and has save relevant operation sequence again, has also just reduced production cost naturally; The 4th, because one of characteristics of the present invention are can make as the granule coating of crystal seed to grow up, so the particle of direct original granulation just needn't require too big, requirement for height to granulation tower does not just need too high yet like this, the height that reduces granulation tower has not just reduced the expense of building, and main is has decreased many owing to the reduction of various raw material hoisting depths makes the operating cost in the production and the maintenance cost of lifting device.

Technical scheme 1: melt composite fertilizer rotary sprinkling pelleting device, granulation spray dish (10) is fixed on the lower end of hollow spindle (4) and by hollow shaft (4) driven rotary, feed box (7) is enclosed within on the hollow shaft (4), its top is connected with transmission mechanism (3), the opening of bottom is directly to granulation spray dish (10), seed particles material feed pipe (5) discharging opening is communicated with feed box (7), transmission mechanism (3) is enclosed within hollow shaft (4) and goes up and drive the hollow shaft rotation, current collection slip ring (2) is positioned at the top of hollow shaft (4), feed box (8) is enclosed within on the feed box (7), the opening of its underpart is directly to granulation spray dish (10), and melt liquid material feed pipe (6) discharging opening is communicated with feed box (8).

Technical scheme 2: a kind of melt as claimed in claim 1 composite fertilizer rotary sprinkling pelleting method, when the crystal seed granule is fallen on the end face of granulation spray dish of heated horizontal rotary body, under centrifugal action, will slide to the outer rim of spray dish rapidly, it will inevitably touch from fused solution charging box and let out the fused solution of falling on the granulation spray dish end face this moment, because centrifugal action, the time that fused solution on the granulation spray dish end face and crystal seed small particles material stop on spray dish end face is all very of short duration, cover the process that still is not enough to this crystal seed fusion has just been begun cooling at crystal seed granule liquation on one's body, in the process of landing cooling, the fused solution that the crystal seed granule coats all over the body is the ball particle that core is shrunk to a more volume with the crystal seed granule, what fall into the granulation tower bottom is two kinds of grain products, a kind of is the finished particle that also can be used as seed particles of original granulation, another kind is that its volume that has coated one deck molten mass has increased a particle that encloses, two kinds of grain products are fallen the particle collection device at the bottom of the granulation tower simultaneously, after classified screening is handled, the particle that meets technological requirement enters the finished product packing operation, particle less than technological requirement enters the coating operation, the powder that does not meet the cladding process requirement enters the fusion operation, so circulation finishes until sprinkling pelleting.

Technical scheme 3: the melt composite fertilizer rotary sprinkling pelleting tower that a kind of melt composite fertilizer rotary sprinkling pelleting device constitutes, melt composite fertilizer rotary sprinkling pelleting device is positioned at the center at granulation tower top.

The present invention compares with background technology, and the one, granulation also can be in direct granulation be carried out melt to the crystal seed granule and coats its sphere diameter is grown up separately; The 2nd, frame for movement is simple, operation and easy to maintenance; The 3rd, prilling spry does not have clogging forever to be taken place, so must cleaned and changed prilling spry; The 4th, wide than traditional handicraft to the volume requirement of solid material in the fused materials, operating procedure is simple; The 5th, shower nozzle is from preheating and control the shower nozzle prilling temperature voluntarily, and whole granulation process does not need steam preheating and steam to blow down; The 6th, because the particle sphere diameter of original granulation is less, so the height of granulation tower is much lower than the granulation tower of traditional handicraft; The 7th, the application equally also adapts to other full-bodied, as to contain the chemical material of solid suspension insoluble matter granulation.

Description of drawings:

Fig. 1 is that master of the present invention looks schematic diagram.

Fig. 2 is that schematic diagram is looked on a left side of the present invention.

Fig. 3 is that crystal seed granule of the present invention coats the method schematic diagram of growing up.

Fig. 4 is a granulation cladding process flow chart of the present invention

The specific embodiment:

With reference to accompanying drawing 1～4, Ben Shenbiao is explained.Comminutor is installed on the granulation tower top working lining of hollow cylinder structure; motor 14 drags the granulation spray dish 10 of the hollow spindle 4 lower shaft end connection of comminutor transmission mechanism 3 and makees folk prescription to horizontally rotating; with the hollow spindle 4 concentric separate feed boxes that are provided with two collar-shaped; what be positioned at inner ring is seed particles material feed box 7; what be positioned at the outer ring is melt liquid material feed box 8; feed pipe 5 is connected with seed particles material feed box 7; feed pipe 6 is connected with melt liquid material feed box 8; the sheet paddle 15 that is welded with one group of certain spiral angle of band of the bottom symmetry of hollow spindle 4; its effect is that solid-state seed particles is spilt cloth uniformly on rotation spray dish end face; the bottom of granulation spray dish 10 is granulation spray dish electric heaters 11 of a hollow disk-shaped shape; granulation spray dish electric heater 11 and granulation spray dish 10 rely on pressing plate 12 and bolt to combine as a whole; temperature sensor 13 is fixed on the end face of pressing plate 12; on the outer ring of melt liquid material feed box 8, be with a charging box electric heater 9; the lead of granulation spray dish electric heater 11 and temperature sensor 13 passes from the centre bore of hollow spindle 4 with the collector ring 2 of four slideways and is connected, by carbon brush holder 1 and electric appliance control box UNICOM.With melt temperature is that 125 ℃ N.P.K three element compound fertilizer is an example: the NPK fused solution that meets technological requirement drops on the heated granulation spray dish end face that horizontally rotates continuously through melt liquid material feed box, fused solution is promptly done radial centrifugal motion with rotation spray dish and is tangential direction and hightails the spray disk body and fragment into a certain proportion of drop immediately after touching granulation spray dish end face, drop in the landing process naturally contraction be cooled to the spherical solid particle.The average ball diameter of the present embodiment finished particle is controlled between 0.8～1.5 millimeter of the Φ; The heating-up temperature of granulation spray dish is by temperature sensor control, and the present embodiment granulation spray dish control temperature is 125 ℃+5 ℃; Power of motor is 1.5 kilowatts, and rotating speed of motor can change the sphere diameter of finished particle and the scope of sprinkling by Frequency Converter Control by the rotating speed that changes the spray dish; The fused solution injected volume of the present embodiment is per hour 2 tons; The granulation spray dish of the present embodiment is 40 meters apart from the height on ground.The finished particle that utilizes original granulation is as seed particles, entering seed particles material feed box through elevator system quantitatively drops on the granulation spray dish end face in the work again, what granulation spray this moment dish sprayed is two kinds of grain products, a kind of is the finished particle of original granulation, another kind is that its volume that has coated one deck molten mass has increased a seed particles of enclosing, two kinds of grain products are fallen the particle collection device at the bottom of the granulation tower simultaneously, the particle that meets technological requirement after classified screening is handled enters the finished product packing operation, enters circulation less than the particle of technological requirement and coats operation.The seed particles injected volume of the present embodiment is per hour 1.5 tons.

Embodiment 1: melt composite fertilizer rotary sprinkling pelleting device, granulation spray dish 10 is fixed on the lower end of hollow spindle 4 and by hollow shaft 4 driven rotary, feed box 7 is enclosed within on the hollow shaft 4, its top is connected with transmission mechanism 3, the opening of bottom is directly to granulation spray dish 10, seed particles material feed pipe 5 discharging openings are communicated with feed box 7, transmission mechanism 3 is enclosed within on the hollow shaft 4 and drives the hollow shaft rotation, current collection slip ring 2 is positioned at the top of hollow shaft 4, feed box 8 is enclosed within on the feed box 7, the opening of its underpart is directly to granulation spray dish 10, and melt liquid material feed pipe 6 discharging openings are communicated with feed box 8.The electric heater 11 that 10 lower surfaces are provided with a toroidal is coiled in the granulation spray, and is with pressing plate 12 that itself and granulation spray dish 10 is fixing.Granulation spray dish 10 and current collection slip ring 2, spray dish electric heater 11, melt material feed box 8 and crystal seed material feed box are 7 concentric, its axis overlaps with the granulation tower axis.Temperature sensor 13 is equipped with at the back side of granulation spray dish 10.Current collection slip ring 2 is four roads, and the twice slip ring connects electric heater 11, and the twice slip ring connects temperature sensor 13 in addition.The lead of spray dish electric heater 11 and temperature sensor 13 passes with the current collection slip ring 2 that is fixed on hollow spindle 4 tops from the centre bore of hollow spindle 4 and is connected.Four groups of carbon brush of carbon brush holder 1 often contact by the brush holder spring constant voltage with four road slip rings of collector ring 2 respectively.The granulation spray dish 10 that is positioned at the discharging opening below of melt material feed box 8 and crystal seed material feed box 7 is made folk prescription to horizontally rotating by hollow spindle 4 drives of transmission mechanism 3, granulation spray dish 10 is driven by transmission mechanism 3 by motor 14, and the frequency of motor 14 is controlled by industrial frequency transformer.

Embodiment 2: on the basis of embodiment 1, the center that melt composite fertilizer rotary sprinkling pelleting device is installed in the granulation tower top gets final product.

Embodiment 3: on the basis of embodiment 1 and 2, can make the granule as crystal seed coat the principle and the method for growing up: the filled arrows of black and horizontal dash line are represented fused solution among the figure three, the array of hollow arrow and dot is then represented the crystal seed granule, the short grained feed box 7 of crystal seed is positioned at the inner ring of fused solution feed box 8, when the crystal seed granule is fallen on the end face of granulation spray dish 10 of heated horizontal rotary body, under centrifugal action, will slide to the outer rim of spray dish 10 rapidly, it will inevitably touch to let out from fused solution charging box 8 and fall the granulation spray and coil fused solution on 10 end faces this moment, because centrifugal action, fused solution on 10 end faces and crystal seed small particles material are coiled in the granulation spray, and to coil the time that stops on 10 end faces in spray all very of short duration, therefore cover the process that still is not enough to this crystal seed fusion has just been begun cooling at crystal seed granule liquation on one's body, in the process of landing cooling, the fused solution that the crystal seed granule coats all over the body is ball particle that core be shrunk to a more volume with nature with the crystal seed granule owing to self surface tension reason, because the kernel of this particle itself is exactly not need the solid that cools off, so although the volume of new particle has increased, but its required distance of cooling or time can't be more required than original granulation cooling distance or time long, also just because of this, this method only uses the height of 2/3rds existing urea prilling towers just can produce compound fertilizer granules greater than 3 millimeters sphere diameters.What fall into the granulation tower bottom is two kinds of grain products, a kind of is the finished particle that also can be used as seed particles of original granulation, another kind is that its volume that has coated one deck molten mass has increased a particle that encloses, two kinds of grain products are fallen the particle collection device at the bottom of the granulation tower simultaneously, the particle that meets technological requirement after classified screening is handled enters the finished product packing operation, particle less than technological requirement enters the coating operation, and the powder that does not meet the cladding process requirement enters the fusion operation.Figure four is flow charts of this patent, 16 is the fused materials mixing arrangement among the figure, 17 is the seed particles storage bin hopper, 18 is prilling granulator, 19 is granulation tower bottom material-collecting funnel, and 20,21,22 is belt conveyor, and 23 is screening plant, 24 is the finished particle packaging process, and 25 is the seed particles lifting device.

What need understand is: though the foregoing description is to the present invention's detailed explanation of contrasting; but these explanations are just illustrative to the present invention; rather than limitation of the present invention, any innovation and creation that do not exceed in the connotation of the present invention all fall within the scope of protection of the present invention.

Claims

1, a kind of melt composite fertilizer rotary sprinkling pelleting device, it is characterized in that: granulation spray dish (10) is fixed on the lower end of hollow spindle (4) and by hollow shaft (4) driven rotary, feed box (7) is enclosed within on the hollow shaft (4), its top is connected with transmission mechanism (3), the opening of bottom is directly to granulation spray dish (10), seed particles material feed pipe (5) discharging opening is communicated with feed box (7), transmission mechanism (3) is enclosed within hollow shaft (4) and goes up and drive the hollow shaft rotation, current collection slip ring (2) is positioned at the top of hollow shaft (4), feed box (8) is enclosed within on the feed box (7), the opening of its underpart is directly to granulation spray dish (10), and melt liquid material feed pipe (6) discharging opening is communicated with feed box (8).

2, melt according to claim 1 composite fertilizer rotary sprinkling pelleting device, it is characterized in that: granulation spray dish (10) lower surface is provided with the electric heater (11) of a toroidal, with pressing plate (12) itself and granulation spray dish (10) is fixed.

3, melt according to claim 1 composite fertilizer rotary sprinkling pelleting device, it is characterized in that: granulation spray dish (10) is concentric with current collection slip ring (2), spray dish electric heater (11), melt material feed box (8) and crystal seed material feed box (7), its axis overlaps with the granulation tower axis.

4, melt according to claim 1 composite fertilizer rotary sprinkling pelleting device, it is characterized in that: temperature sensor (13) is equipped with at the back side of granulation spray dish (10).

5, melt according to claim 1 composite fertilizer rotary sprinkling pelleting device, it is characterized in that: current collection slip ring (2) is four roads, and the twice slip ring connects electric heater (11), and the twice slip ring connects temperature sensor (13) in addition.

6, melt according to claim 1 composite fertilizer rotary sprinkling pelleting device is characterized in that: the lead of spray dish electric heater (11) and temperature sensor (13) passes with the current collection slip ring (2) that is fixed on hollow spindle (4) top from the centre bore of hollow spindle (4) and is connected.

7, melt according to claim 1 composite fertilizer rotary sprinkling pelleting device is characterized in that: four groups of carbon brush of carbon brush holder (1) often contact by the brush holder spring constant voltage with four road slip rings of collector ring (2) respectively.

8, melt according to claim 1 composite fertilizer rotary sprinkling pelleting device, it is characterized in that: the granulation spray dish (10) that is positioned at the discharging opening below of melt material feed box (8) and crystal seed material feed box (7) is made folk prescription to horizontally rotating by hollow spindle (4) drive of transmission mechanism (3), and granulation spray dish (10) is driven by transmission mechanism (3) by motor (14).

9, a kind of melt as claimed in claim 1 composite fertilizer rotary sprinkling pelleting method, it is characterized in that: when the crystal seed granule is fallen on the end face of granulation spray dish of heated horizontal rotary body, under centrifugal action, will slide to the outer rim of spray dish rapidly, it will inevitably touch from fused solution charging box and let out the fused solution of falling on the granulation spray dish end face this moment, because centrifugal action, the time that fused solution on the granulation spray dish end face and crystal seed small particles material stop on spray dish end face is all very of short duration, cover the process that still is not enough to this crystal seed fusion has just been begun cooling at crystal seed granule liquation on one's body, in the process of landing cooling, the fused solution that the crystal seed granule coats all over the body is the ball particle that core is shrunk to a more volume with the crystal seed granule, what fall into the granulation tower bottom is two kinds of grain products, a kind of is the finished particle that also can be used as seed particles of original granulation, another kind is that its volume that has coated one deck molten mass has increased a particle that encloses, two kinds of grain products are fallen the particle collection device at the bottom of the granulation tower simultaneously, after classified screening is handled, the particle that meets technological requirement enters the finished product packing operation, particle less than technological requirement enters the coating operation, the powder that does not meet the cladding process requirement enters the fusion operation, so circulation finishes until sprinkling pelleting.

10, the melt composite fertilizer rotary sprinkling pelleting tower that constitutes of a kind of melt composite fertilizer rotary sprinkling pelleting device, it is characterized in that: melt composite fertilizer rotary sprinkling pelleting device is positioned at the center at granulation tower top.