CN216584775U

CN216584775U - White fertilizer defluorination device and white fertilizer defluorination comprehensive treatment system thereof

Info

Publication number: CN216584775U
Application number: CN202123264637.6U
Authority: CN
Inventors: 黄建勋; 张德军; 赵欧; 唐建云; 高锐
Original assignee: Sichuan Hanyuan Chemical General Factory
Current assignee: Sichuan Hanyuan Chemical General Factory
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-05-24
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses a white fertilizer defluorination device and a white fertilizer defluorination comprehensive treatment system thereof, a white fertilizer feed pipeline and a pot gas collecting hood are hermetically communicated at the two ends of a defluorination rotary kiln along the material conveying direction, a heating mechanism for heating the white fertilizer in the kiln is arranged on the inner wall of the defluorination rotary kiln, the top end of the pot gas collecting hood is provided with a gas outlet for discharging the fluorine-containing pot gas, the gas outlet is communicated with a fluorine collector capable of leading out the fluorine-containing pot gas under negative pressure, the bottom end of the pot gas collecting hood is hermetically communicated with a burnt slag leading-out mechanism, the white fertilizer is transmitted to the other end of the defluorination rotary kiln from one end, the white fertilizer is fully heated, the fluorine-containing pot gas is fully separated from the white fertilizer, the separated fluorine-containing pot gas is further led out from the defluorination rotary kiln under the negative pressure suction of the fluorine collector, the efficiency of the white fertilizer defluorination is greatly improved, and no addition of other substances in the prior art is needed, further, the fluorine is recovered in high quality without being affected by other impurities.

Description

White fertilizer defluorination device and white fertilizer defluorination comprehensive treatment system thereof

Technical Field

The utility model relates to a white fertilizer defluorination technical field especially relates to a white fertilizer defluorination device and white fertilizer defluorination integrated processing system thereof.

Background

In the prior art, the special status and the application of fluorine in the fields of electronics, medicine, engineering and the like are continuously expanded, and the fluorine becomes a bright point for the development of the chemical field. At present, in most of feed-grade calcium hydrophosphate plants in China, the basic flow is wet extraction, lime milk is neutralized and defluorinated, the byproduct contains about 25 percent of P2O5, and the annual production amount of the fertilizer-grade calcium hydrophosphate (commonly called white fertilizer) waste byproduct containing about 19 percent of fluorine is about 100 ten thousand tons. Therefore, a production system which can remove and recover fluorine in the white fertilizer and improve the quality and value of the white fertilizer is in short supply in the industry.

Patent document CN106698379A discloses a method for improving defluorination yield by two-stage white fertilizer re-dissolution, which adopts the following process steps: 1) feeding thick slurry after defluorination and thickening in the second section into a centrifugal center rotary trough, and filtering washing liquid in a phosphoric acid workshop for white fertilizer in an acid dissolving trough for coarse dissolving; 4) returning the dissolved thick slurry to a crystal growing tank of a phosphoric acid workshop for extraction and then filtering; 5) the calcium slurry is adopted for defluorination after phosphoric acid desulfurization after filtration, the beneficial effects of the utility model are that: the dissolution rate is stable, the recovery rate of the white fertilizer is high, the recovery rate of the calcium hydrophosphate reaches 99 percent, and the production capacity of the defluorination device is improved by about 20 percent; the iron, aluminum and fluorine compounds of the second-stage white fertilizer can be taken away by 10 percent through the phosphogypsum; the neutralization operation of the first-stage and the second-stage neutralization is more stable and controllable, and the whole defluorination yield can be improved by 3 percent; but inevitably produces waste by-products.

Patent document CN207755984U discloses a phosphoric acid tail gas absorption device, which comprises a defluorination device (1), a fluorine recycling device (2) and a post-treatment device (3), effectively utilizes the discharged ammonia gas of a phosphate fertilizer plant as a medium, so that the fluorine-containing tail gas forms byproduct white carbon black, the water is recycled, ammonia gas and fluorine-containing tail gas are removed, and a large amount of fresh water is not needed, but the cost is inevitably increased on the premise of using ammonia gas, and the recovery of fluorine is easily influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a white fertile defluorination device and white fertile defluorination integrated processing system thereof to solve the problem that above-mentioned prior art exists, through the defluorination rotary kiln, add white fertile limit and add thermal decomposition fluorine material to it on the limit, collecting fluorine material, realized white fertile defluorination in-process high efficiency processing, and do not have the interpolation of other materials among the prior art, realize the high-quality recovery of fluorine and white fertile.

In order to achieve the above object, the utility model provides a following scheme: the utility model provides a white fertile defluorination device, be in including defluorination rotary kiln, along the sealed intercommunication of material direction of transfer white fertile charge-in pipeline and pot gas collecting channel at defluorination rotary kiln both ends, be equipped with the heating mechanism who is used for heating the interior white fertile of kiln on the inner wall of defluorination rotary kiln, pot gas collecting channel top is offered and is used for the exhaust gas outlet of fluorine-containing pot gas, the gas outlet intercommunication has the fluorine collecting system that can the negative pressure draw forth fluorine-containing pot gas, pot gas collecting channel bottom seal intercommunication has the cinder to derive the mechanism.

Preferably, the heating mechanism comprises a hollow pipeline extending from the pot gas collecting hood to the white fertilizer feeding pipeline, one end of the hollow pipeline close to the pot gas collecting hood is communicated with a hot blast stove, and one end of the hollow pipeline close to the white fertilizer feeding pipeline is provided with a hot blast outlet.

Preferably, a hot air inlet cover is communicated between the hot air furnace and the hollow pipeline, the hot air inlet cover is rotatably and hermetically arranged at the discharge end of the defluorination rotary kiln, and the pot gas collecting cover is hermetically communicated with the defluorination rotary kiln through penetrating through the hot air inlet cover.

Preferably, the hot blast stove and the hot blast inlet are covered with a cyclone separator for removing impurities in the hot blast.

Preferably, a hot air outlet cover is communicated between the hot air outlet and the hollow pipeline, the hot air outlet cover is rotatably and hermetically arranged at the feed end of the defluorination rotary kiln, and the white fertilizer feed pipeline penetrates through the hot air outlet cover in a sealing manner and is communicated with the defluorination rotary kiln.

Preferably, the hot air outlet is communicated with a flue gas washing tower, and an air outlet of the flue gas washing tower is communicated with a first gas-liquid separator.

Preferably, the two ends of the rotary defluorination kiln are respectively sleeved with a cold air sleeve, a rotary sealing mechanism is arranged between each cold air sleeve and the hot air outlet cover and between each cold air sleeve and the hot air inlet cover, the whole rotary sealing mechanism is of a conical cover-shaped structure, one end of the conical cover-shaped structure is fixed on the hot air outlet cover or the hot air inlet cover, and the other end of the conical cover-shaped structure is tightly attached to the cold air sleeve.

Preferably, the conical cover-shaped structure is provided with a material collecting hole for receiving leaked materials of the defluorination rotary kiln, and a funnel for recovering the leaked materials is arranged below the material collecting hole.

The white fertilizer defluorination comprehensive treatment system comprises the white fertilizer defluorination device and a mixer communicated with the burnt slag derivation mechanism of the white fertilizer defluorination device, wherein concentrated acid matched with the burnt slag is introduced into the mixer, and a discharge part of the mixer is communicated with a storage yard for curing mixed materials of the concentrated acid and the burnt slag.

Preferably, the fluorine collecting system comprises a negative pressure induced air mechanism communicated with the air outlet, a plurality of stages of fluorine absorption towers for flowing of the fluorine-containing boiler gas are connected in series between the negative pressure induced air mechanism and the air outlet, the fluorine absorption towers are provided with spraying mechanisms for circularly spraying fluorine absorption liquid in the fluorine absorption towers, and the outlet of the fluorine absorption tower at the last stage is communicated with a second gas-liquid separator.

The utility model discloses for prior art gain following technological effect:

firstly, a white fertilizer feeding pipeline and a pot gas collecting hood are hermetically communicated at two ends of a defluorination rotary kiln along a material conveying direction, a heating mechanism for heating white fertilizer in the kiln is arranged on the inner wall of the defluorination rotary kiln, a gas outlet for discharging fluorine-containing pot gas is arranged at the top end of the pot gas collecting hood, the gas outlet is communicated with a fluorine collector capable of leading out fluorine-containing pot gas under negative pressure, a burned slag leading-out mechanism is hermetically communicated at the bottom end of the pot gas collecting hood, the white fertilizer is conveyed to the other end of the defluorination rotary kiln from one end of the defluorination rotary kiln in a penetrating way and is fully heated under the heating action of the whole defluorination rotary kiln, further the fluorine-containing pot gas is fully separated from the white fertilizer, and the white fertilizer feeding pipeline and the pot gas collecting hood are hermetically connected with the defluorination rotary kiln, so that the interference of external gas is avoided, further, the separated fluorine-containing pot gas is led out of the rotary kiln under the negative pressure suction of the fluorine collector, the working process of feeding, decomposing and collecting while is realized, the efficiency of defluorination of the white fertilizer is greatly improved, no other substances in the prior art are added, and further no influence of other impurities exists, so that high-quality recovery of fluorine is realized.

Secondly, the heating mechanism comprises a hollow pipeline extending from the boiler gas collecting hood to the white fertilizer feeding pipeline, one end of the hollow pipeline close to the boiler gas collecting hood is communicated with a hot blast stove, one end of the hollow pipeline close to the white fertilizer feeding pipeline is provided with a hot blast outlet, namely, the white fertilizer penetrates through the whole defluorination rotary kiln along the direction of the white fertilizer feeding pipeline towards the boiler gas collecting hood, the hot blast flows along the direction of the boiler gas collecting hood to the white fertilizer feeding pipeline, the initially entering white fertilizer is preheated by utilizing the hot blast with prior heat conduction in the defluorination rotary kiln, the middle section and the tail section of the defluorination rotary kiln are sufficiently heated, the heating effect of the white fertilizer in the defluorination rotary kiln is ensured, and the full separation of the fluorine-containing boiler gas can be ensured.

And thirdly, a hot air inlet cover is communicated between the hot air furnace and the hollow pipeline, the hot air inlet cover is rotatably and hermetically arranged at the discharge end of the defluorination rotary kiln, the boiler gas collecting cover penetrates through the hot air inlet cover in a sealing manner to be communicated with the defluorination rotary kiln, hot air is uniformly distributed to each hollow pipeline through the hot air inlet cover, the hot air quantity in each hollow pipeline is ensured, and then the white fertilizer is uniformly heated by the whole defluorination rotary kiln.

Fourthly, the hot air outlet is communicated with a flue gas washing tower, the gas outlet of the flue gas washing tower is communicated with a first gas-liquid separator, gas-liquid separation is carried out on the purified flue gas through the first gas-liquid separator, the discharged gas is guaranteed to fully reach the standard, and the atmospheric pollution is effectively prevented.

Fifthly, the mixer is communicated with the burnt slag guiding mechanism, concentrated acid matched with the burnt slag is introduced into the mixer, a discharging part of the mixer is communicated with a storage yard for curing the mixed material of the concentrated acid and the slag, and the burnt slag after fluorine separation can be used for preparing high-quality phosphate fertilizer by adding acid, stirring and curing treatment of the burnt slag, so that high-quality utilization of phosphorus in the white fertilizer is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the defluorination rotary kiln of the utility model;

the device comprises a hot air outlet cover 1, a white fertilizer feeding pipeline 2, a defluorination rotary kiln 3, a hollow pipeline 4, a hot air inlet cover 5, a boiler gas collecting cover 6, a cinder guiding mechanism 7, a raw material bin 8, an acid storage tank 9, a mixer 10, a hot air furnace 11, a cyclone separator 12, a fluorine absorption tower 13, a fluorine-containing liquid storage tank 14, a first gas-liquid separator 15, a second gas-liquid separator 16, a flue gas washing tower 17, a water storage tank 18, a boiler gas induced draft fan 19 and a rotary sealing mechanism 20.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 2, the present embodiment provides a white fertilizer defluorination apparatus, which includes a defluorination rotary kiln 3, a white fertilizer feeding pipeline 2 and a pot gas collecting hood 6, wherein the defluorination rotary kiln 3 is rotatably disposed on a matched base, the white fertilizer feeding pipeline 2 and the pot gas collecting hood 6 are hermetically communicated with two ends of the defluorination rotary kiln 3 along a material conveying direction, preferably, the white fertilizer feeding pipeline 2 is hermetically provided with a spiral feeder, the white fertilizer is gradually and spirally conveyed into the defluorination rotary kiln 3 through the spiral feeder, the white fertilizer feeding pipeline 2 is communicated with a raw material bin 8 storing the white fertilizer, a heating mechanism for heating the white fertilizer in the defluorination rotary kiln 3 is disposed on an inner wall of the defluorination rotary kiln, the heating mechanism maintains a heating temperature in the defluorination rotary kiln 3 at 300-600 degrees, a gas outlet for discharging the fluorine-containing pot gas is disposed at a top end of the pot gas collecting hood 6, the gas outlet is communicated with a fluorine collector capable of leading out the fluorine-containing pot gas under negative pressure, the bottom end of the boiler gas collecting hood 6 is communicated with a cinder guiding mechanism 7 in a sealing way, the optimized cinder guiding mechanism 7 adopts a closed spiral feeding mechanism to facilitate the discharge of cinder, white fertilizer is conveyed from one end of the defluorination rotary kiln 3 to the other end of the defluorination rotary kiln, the white fertilizer is fully heated by the heating action of the whole defluorination rotary kiln 3, further, the fluorine-containing boiler gas is fully separated from the white fertilizer, and because the white fertilizer feeding pipeline 2 and the boiler gas collecting hood 6 are both connected with the defluorination rotary kiln 3 in a sealing way, the interference of external gas is avoided, further, the separated fluorine-containing boiler gas is led out from the defluorination rotary kiln 3 under the suction of negative pressure of a fluorine collector, the working processes of feeding, decomposition and collection are realized, the defluorination efficiency of the white fertilizer is greatly improved, no other substances in the prior art are added, and no influence of other impurities is caused, so as to realize the high-quality recovery of fluorine, and through setting up the fluorine collector that can the vacuum suction fluorine-containing pot gas for defluorination rotary kiln 3 is the negative pressure atmosphere, and the desorption and the overflow of the fluorine of being convenient for shorten reaction time, have reduced fuel consumption. Preferably, a cyclone dust collector is arranged at the gas outlet to remove solid particle impurities in the fluorine-containing boiler gas.

Wherein, the heating mechanism comprises a hollow pipeline 4 extending from a boiler gas collecting hood 6 to a white fertilizer feeding pipeline 2, one end of the hollow pipeline 4 close to the boiler gas collecting hood 6 is communicated with a hot blast stove 11, one end of the hollow pipeline 4 close to the white fertilizer feeding pipeline 2 is provided with a hot blast outlet, the temperature of the preferred hot blast is 300-, the heating effect of the white fertilizer in the defluorination rotary kiln 3 is ensured, and then the sufficient separation of the fluorine-containing boiler gas can be ensured, preferably, the feeding end and the discharging end of the defluorination rotary kiln 3 are respectively sealed with the gas inlet and the gas outlet of the hollow pipeline 4, so that the flue gas passing through the hollow pipeline 4 is separated from the fluorine-containing boiler gas in the defluorination rotary kiln 3, and the defluorination rotary kiln 3 adopts a built-in coil pipe heating mode, namely the hollow pipeline 4 is arranged in the inner wall of the defluorination rotary kiln 3, the hot air pipe pass is adopted, the material pipe pass is adopted, the shell is insulated so as to save energy, and the hot air and the fluorine-containing boiler gas separation technology are adopted, the absorption efficiency and the high quality of the fluorine absorption liquid are ensured, thereby the traditional lengthy fluorine absorption power device is avoided, and the purpose of high efficiency and energy saving is achieved. Preferably, the hot blast stove 11 uses anthracite with low sulfur content and high calorific value as fuel to reduce the pollution to the atmosphere.

Furthermore, a hot air inlet cover 5 is communicated between the hot air furnace 11 and the hollow pipeline 4, the hot air inlet cover 5 is rotatably and hermetically arranged at the discharge end of the defluorination rotary kiln 3, the boiler gas collecting cover 6 penetrates through the hot air inlet cover 5 in a sealing manner to be communicated with the defluorination rotary kiln 3, hot air is uniformly distributed to each hollow pipeline 4 through the hot air inlet cover 5, the hot air quantity in each hollow pipeline 4 is ensured, and the uniform heating of the whole defluorination rotary kiln 3 on white fertilizers is further ensured.

As the preferred embodiment of the present invention, the hot blast stove 11 and the hot air inlet cover 5 are provided with the cyclone 12 for removing the impurities in the hot air, so that the impurities in the hot air can be removed by the cyclone 12 on the premise of using the anthracite coal with low sulfur content and high calorific value as fuel, thereby effectively preventing the pollution to the atmosphere caused by the hot air discharged from the hot blast stove 11.

Furthermore, a hot air outlet cover 1 is communicated between the hot air outlet and the hollow pipeline 4, the hot air outlet cover 1 is arranged at the feed end of the defluorination rotary kiln 3 in a rotating and sealing mode, and a white fertilizer feed pipeline 2 penetrates through the hot air outlet cover 1 in a sealing mode and is communicated with the defluorination rotary kiln 3, so that hot air in the hollow pipeline 4 can be conveniently concentrated and recovered, and then subsequent treatment is carried out.

Furthermore, the hot air outlet is communicated with a flue gas washing tower 17, and hot air exhausted from the hot air outlet is washed and filtered through the flue gas washing tower 17, so that the atmospheric pollution is further effectively prevented. It is particularly preferred that a spraying mechanism for spraying water to the introduced flue gas is arranged in the flue gas washing tower 17, a water storage tank 18 is arranged outside the flue gas washing tower 17, the water storage tank 18 is communicated with the bottom of the flue gas washing tower 17, water flow after spraying flows back to the water storage tank 18, and the water storage tank 18 is communicated with the spraying mechanism through a water pump mechanism, so that water for spraying the flue gas is recycled.

Preferably, the gas outlet of the flue gas washing tower 17 is communicated with a first gas-liquid separator 15, and the purified flue gas is subjected to gas-liquid separation through the first gas-liquid separator 15, so that the discharged gas is ensured to fully reach the standard, and the atmospheric pollution is effectively prevented.

Furthermore, both ends of the rotary defluorination kiln 3 are sleeved with cold air sleeves, a rotary sealing mechanism 20 is arranged between each cold air sleeve and the hot air outlet mask 1 and the hot air inlet mask 5 respectively, the whole rotary sealing mechanism 20 is of a conical cover-shaped structure, one end of the conical cover-shaped structure is fixed on the hot air outlet mask 1 or the hot air inlet mask 5, for example, welding and other modes are adopted, and the other end of the conical cover-shaped structure is tightly attached to the cold air sleeves. Specifically, a supporting flange is arranged on the defluorination rotary kiln 3, and the cold air sleeve is connected with the supporting flange. The cone-shaped cover structure comprises heat-resistant steel fish scales (friction plates), a carbon-silicon-aluminum composite plate (sealing body) and steel plate fish scales (pressing plates), the heat-resistant steel fish scales (friction plates), the carbon-silicon-aluminum composite plate (sealing body) and the steel plate fish scales (pressing plates) are sequentially fixed on the hot air outlet mask 1 or the hot air inlet mask 5 through bolts in a connected mode, the heat-resistant steel fish scales are tightly attached to the cold air sleeve, and then the tensioning device is used for achieving gapless sealing. The whole rotary sealing mechanism 20 can well adapt to the complex motion of the end part of the defluorination rotary kiln 3, one end of the rotary sealing mechanism is hermetically fixed on the hot air outlet mask 1 or the hot air inlet mask 5 when in use, the rotary sealing mechanism effectively eliminates the axial, radial and circumferential gaps of the defluorination rotary kiln 3 to realize gapless sealing, and the rotary sealing mechanism 20 is internally and auxiliarily provided with an automatic ash returning and reflecting plate device, integrates labyrinth type, friction type and fish scale type sealing, has the advantages of good mining, gives full play to the material characteristic advantages, highlights the characteristics of rigid sealing material blocking and flexible sealing wind isolation, and ensures that a movable sealing body and a static sealing body exert good stability and functional effects in a limited activity area of equipment.

Preferably, the conical cover-shaped structure is provided with a material collecting hole for receiving leaked materials of the defluorination rotary kiln 3, a funnel for recovering the leaked materials is arranged below the material collecting hole, on one hand, the leaked materials are received, the leaked materials are prevented from polluting the environment, and on the other hand, the leaked materials can be recovered.

Still provide a white fertile defluorination integrated processing system, including white fertile defluorination device, the blendor 10 that is linked together with white fertile defluorination device's cinder derivation mechanism 7, blendor 10 is linked together with cinder derivation mechanism 7, it has the concentrated acid that matches with cinder volume to let in the blendor 10, it is preferred to be equipped with acid storage tank 9 in one side of blendor 10, the discharge portion intercommunication of blendor 10 has the heap that is used for curing the mixed back material of concentrated acid and cinder, through the acidification to the cinder, stirring and curing treatment, make the cinder after the separation fluorine can prepare high-quality phosphorus fertilizer, guarantee the high-quality utilization of phosphorus in the white fertile. The preferable mixer 10 adopts a double-shaft spiral mixer to ensure that the concentrated acid and the slag are uniformly mixed, and the slag is added with the concentrated acid and mixed and then sent to a storage yard for curing to obtain the qualified high-quality phosphate fertilizer. A small amount of waste gas emitted from the mixer 10 is introduced into the flue gas washing tower 17 for treatment, so that the production environment is ensured.

The fluorine collecting system comprises a negative pressure induced air mechanism communicated with the gas outlet, a plurality of stages of fluorine absorption towers 13 for flowing of the fluorine-containing boiler gas are connected in series between the negative pressure induced air mechanism and the gas outlet, the fluorine absorption towers 13 are matched with spraying mechanisms for circularly spraying fluorine absorption liquid in the fluorine absorption towers, the outlet of the last stage of fluorine absorption tower 13 is communicated with a second gas-liquid separator 16, preferably, the negative pressure induced air mechanism is a boiler gas induced draft fan 19, and the boiler gas induced draft fan 19 enables a certain negative pressure to be formed in the defluorination rotary kiln 3 and the fluorine absorption towers 13, so that the overflow of fluorine and the absorption of the fluorine-containing boiler gas are facilitated. The utility model is suitable for the production of preparing fluorine-containing solution and high-quality phosphate fertilizer by treating 5-10 ten thousand tons of white fertilizer annually, can greatly reduce the consumption of strategic resource fluorite, and improves the value of phosphorus resource; and other related waste and side resources can be recovered in the same manner. Removing fluorine in the white fertilizer by indirect heating and absorbing fluorine by spraying

The production equipment process for preparing the fluorine-containing solution by using gas and preparing the high-quality phosphate fertilizer by adding acid into the defluorinated cinder ensures the efficient utilization of resources such as fluorine, phosphorus and the like.

As the utility model discloses preferred embodiment is equipped with the cyclone 12 that is used for removing dust with fluorine-containing boiler gas between the gas outlet that 6 tops of boiler gas collecting channel were seted up and fluorine absorption tower 13 to carry out prefiltering to fluorine-containing boiler gas, avoid the cleanliness factor after solid particle in the fluorine-containing boiler gas influences fluorine absorption liquid absorption fluorine.

Preferably, a fluorine-containing liquid storage tank 14 is provided outside the fluorine absorption tower 13, the fluorine-containing liquid storage tank 14 is connected to the bottom of the fluorine absorption tower 13, and the fluorine-containing liquid storage tank 14 is connected to a spray mechanism in the fluorine absorption tower 13 via an anti-corrosion pump. The fluorine-containing liquid storage tank 14 is made of plastic materials or carbon steel and glass fiber reinforced plastic fluorine corrosion resistant equipment. And preferably, the fluorine absorption tower 13 adopts a two-stage empty tower for spray absorption, the spray nozzles of the spray mechanism adopt spiral spray heads, the number of the spray heads in each tower is 3, the spray heads are distributed on the same plane at an angle of 120 degrees, the fluorine-containing boiler gas enters from the lower part of the fluorine absorption tower 13 and is led out from the top of the fluorine absorption tower 13, so that the spray fluorine absorption liquid is ensured to be fully contacted with the fluorine-containing boiler gas, and the capture and absorption of fluorine are completed to the maximum extent.

The utility model discloses a whole processing procedure as follows: white fertilizer enters the defluorination rotary kiln 3 from the raw material bin 8 through the white fertilizer feeding pipeline 2, a heating mechanism is arranged in the defluorination rotary kiln 3, and a heat source provides coal or gas heating gas for a hot blast stove 11. The white fertilizer and hot air in the hollow pipeline 4 move in a counter-current way in the defluorination rotary kiln 3, white fertilizer cinder is discharged and then is sent to a mixer 10, and concentrated acid is added for mixing and reacting to obtain high-quality phosphate fertilizer for sale. The defluorination-containing boiler gas in the defluorination rotary kiln 3 is induced by a boiler gas induced draft fan 19, and the atmosphere in the defluorination rotary kiln 3 is in a certain negative pressure, so that the overflow of fluorine is facilitated. The fluorine-containing boiler gas is dedusted by the cyclone deduster and then enters a first-stage fluorine absorption tower 13, fluorine absorption liquid is circularly sprayed and absorbed by a fluorine absorption circulating pump, and the fluorine absorption liquid reaches a certain concentration and then is pumped into a concentrated fluorine-containing liquid storage tank 14 to enter a relevant fluorine product manufacturing process or be sold. The gas which does not receive fluorine completely enters a two-stage fluorine absorption tower 13, absorption liquid circularly absorbs a certain concentration and is pumped into an absorption tower to be used as spraying absorption liquid, and the gas which reaches the standard after fluorine absorption enters a second gas-liquid separator 16 and is emptied. The flue gas heated by the defluorination kiln is led out, then is dedusted by a water curtain of a flue gas washing tower 17, and is discharged after reaching the standard through a first gas-liquid separator 15; the water for washing the flue gas and the gas-liquid separation water containing the fluorine boiler gas are treated together and then discharged after reaching the standard.

The adaptability that carries out according to actual demand all is in the protection scope of the utility model.

It should be noted that, as is obvious to a person skilled in the art, the invention is not limited to details of the above-described exemplary embodiments, but can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims

1. The white fertilizer defluorination device is characterized by comprising a defluorination rotary kiln, a white fertilizer feeding pipeline and a pot gas collecting hood, wherein the white fertilizer feeding pipeline and the pot gas collecting hood are hermetically communicated with the two ends of the defluorination rotary kiln along a material conveying direction, a heating mechanism for heating the white fertilizer in the kiln is arranged on the inner wall of the defluorination rotary kiln, a gas outlet for discharging the fluorine-containing pot gas is formed in the top end of the pot gas collecting hood, the gas outlet is communicated with a fluorine collecting system capable of leading out the fluorine-containing pot gas under negative pressure, and a burned slag leading-out mechanism is hermetically communicated with the bottom end of the pot gas collecting hood.

2. The white fertilizer defluorination device according to claim 1, wherein the heating mechanism comprises a hollow pipeline extending from the pot gas-collecting hood to the white fertilizer feeding pipeline, one end of the hollow pipeline close to the pot gas-collecting hood is communicated with a hot blast stove, and one end of the hollow pipeline close to the white fertilizer feeding pipeline is provided with a hot blast outlet.

3. The white fertilizer defluorination device according to claim 2, wherein a hot air inlet cover is communicated between the hot blast stove and the hollow pipeline, the hot air inlet cover is rotatably and hermetically arranged at the discharge end of the defluorination rotary kiln, and the pot gas collection cover is hermetically communicated with the defluorination rotary kiln through passing through the hot air inlet cover.

4. The white fertilizer defluorination apparatus according to claim 3, wherein said hot blast stove and said hot blast inlet hood are provided with cyclone separators for removing impurities in the hot blast.

5. The white fertilizer defluorination device according to claim 4, wherein a hot air outlet cover is communicated between the hot air outlet and the hollow pipeline, the hot air outlet cover is rotatably and hermetically arranged at the feed end of the defluorination rotary kiln, and the white fertilizer feed pipeline is hermetically communicated with the defluorination rotary kiln through the hot air outlet cover.

6. The white fertilizer defluorination device according to claim 5, wherein the hot air outlet is communicated with a flue gas washing tower, and the air outlet of the flue gas washing tower is communicated with a first gas-liquid separator.

7. The white fertilizer defluorination device according to claim 5 or 6, wherein cold air jackets are respectively sleeved at two ends of the defluorination rotary kiln, a rotary sealing mechanism is respectively arranged between each cold air jacket and the hot air outlet cover and between each cold air jacket and the hot air inlet cover, the whole rotary sealing mechanism is of a conical cover-shaped structure, one end of the conical cover-shaped structure is fixed on the hot air outlet cover or the hot air inlet cover, and the other end of the conical cover-shaped structure is tightly attached to the cold air jacket.

8. The white fertilizer defluorination device according to claim 7, wherein the conical cover-shaped structure is provided with a material collecting hole for receiving the leaked material of the defluorination rotary kiln, and a funnel for recovering the leaked material is arranged below the material collecting hole.

9. A white manure defluorination comprehensive treatment system applying the white manure defluorination device as defined in any one of claims 1 to 8, which comprises the white manure defluorination device and a mixer communicated with the burnt slag leading-out mechanism of the white manure defluorination device, wherein concentrated acid matched with the quantity of the burnt slag is introduced into the mixer, and a discharge part of the mixer is communicated with a storage yard for curing the mixed material of the concentrated acid and the burnt slag.

10. The white fertilizer defluorination comprehensive treatment system according to claim 9, wherein the fluorine collection system comprises a negative pressure induced draft mechanism communicated with the air outlet, a plurality of stages of fluorine absorption towers for flowing of fluorine-containing boiler gas are connected in series between the negative pressure induced draft mechanism and the air outlet, the fluorine absorption towers are provided with a spraying mechanism for circularly spraying fluorine absorption liquid therein, and the outlet of the last stage of fluorine absorption tower is communicated with a second gas-liquid separator.