CN210528819U - System for utilize compound slow-release fertilizer of phosphorus chemical industry waste water production - Google Patents
System for utilize compound slow-release fertilizer of phosphorus chemical industry waste water production Download PDFInfo
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- CN210528819U CN210528819U CN201921249230.6U CN201921249230U CN210528819U CN 210528819 U CN210528819 U CN 210528819U CN 201921249230 U CN201921249230 U CN 201921249230U CN 210528819 U CN210528819 U CN 210528819U
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Abstract
The utility model discloses an utilize system of compound slowly-releasing fertilizer of phosphorus chemical production waste water production, including the wastewater disposal basin, first pH equalizing basin, stirring reaction tank and the first sedimentation tank subassembly that connect gradually, the delivery port of first sedimentation tank subassembly is connected with second pH equalizing basin, the slag notch of first sedimentation tank subassembly is connected with the magnesium ammonium phosphate feed bin, and second pH equalizing basin still is connected with second sedimentation tank subassembly, and the delivery port of second sedimentation tank subassembly is connected with third pH equalizing basin, second sedimentation tank subassembly with the slag notch of third pH equalizing basin is connected with calcium sulfate and calcium phosphate feed bin, and calcium sulfate and calcium phosphate feed bin have connected gradually mixed stirred tank, compound fertilizer granulator, third desiccator, and the magnesium ammonium phosphate feed bin is connected with the third desiccator, the utility model discloses change into magnesium ammonium phosphate, total phosphorus etc. in the waste water that the phosphamidon chemical plant produced into magnesium ammonium phosphate feed bin, Calcium phosphate and calcium sulfate, and finally prepare into compound slow release fertilizer, the active substance in the waste water is utilized, the waste water can reach the standard and discharge.
Description
Technical Field
The utility model relates to a chemical industry waste water treatment field, concretely relates to utilize system of compound slowly-releasing fertilizer of phosphorus chemical industry waste water production.
Background
Agricultural production in China mostly adopts intensive scale planting, the dependence degree on chemical fertilizers is very high, the application amount (pure) of the chemical fertilizers in China in 2010 reaches 5550 ten thousand tons, and the application amount of the chemical fertilizers is 455.9 kg/hectare in the first place in the world and is 3.75 times of the average level in the world. Phosphate fertilizers are divided into monoammonium phosphate and diammonium phosphate, and have the characteristics of stable performance, good water solubility and the like, so that the phosphate fertilizers are widely applied. However, a large amount of wastewater, mainly ammonia nitrogen wastewater and phosphorus-containing wastewater, is generated in ammonium phosphate production and is discharged without being treated, so that the environment is inevitably polluted; but the technical difficulty of the treatment is large and the cost is high. According to the relevant requirements of national environmental protection, the nitrogen and ammonia content in the wastewater needs to be treated to be below 35mg/L, and the phosphorus content needs to be treated to be below 15mg/L, so that the wastewater can be discharged. The treatment of ammonia nitrogen wastewater generated in the ammonium phosphate production process for a long time becomes a bottleneck restricting the development of ammonium phosphate production enterprises.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an utilize system of compound slowly-releasing fertilizer of phosphorus chemical production waste water production.
The technical scheme is as follows: the utility model provides a system for utilize compound slow-release fertilizer of phosphorus chemical industry waste water production which the key lies in: the device comprises a wastewater pool, a first pH adjusting pool, a stirring reaction tank and a first sedimentation tank assembly which are connected in sequence, wherein the stirring reaction tank is connected with a magnesium oxide bin, a water outlet of the first sedimentation tank assembly is connected with a second pH adjusting pool, and a slag outlet of the first sedimentation tank assembly is connected with an ammonium magnesium phosphate bin;
the second pH adjusting tank is connected with a lime bin, the second pH adjusting tank is also connected with a second settling tank assembly, a water outlet of the second settling tank assembly is connected with a third pH adjusting tank, the third pH adjusting tank is connected with a dilute sulfuric acid storage tank, and slag outlets of the second settling tank assembly and the third pH adjusting tank are connected with a calcium sulfate and calcium phosphate bin;
the calcium sulfate and calcium phosphate feed bin is connected with the mixing and stirring tank, and the feed inlet of this mixing and stirring tank still is connected with nitrogen source feed bin, phosphorus source feed bin and potassium source feed bin, the discharge gate of mixing and stirring tank is connected with compound fertilizer granulator, compound fertilizer granulator is connected with the third desiccator, the magnesium ammonium phosphate feed bin is connected with the magnesium ammonium phosphate dissolving tank, this magnesium ammonium phosphate dissolving tank through the spray gun with the third desiccator is connected, the third desiccator is connected with compound fertilizer storage storehouse.
By adopting the technical scheme, the waste water produced by an ammonium phosphate production plant is fully reacted with the added magnesium oxide in the stirring reaction tank after the pH value is adjusted to generate magnesium ammonium phosphate, the reaction is complete and rapid, the generated magnesium ammonium phosphate is precipitated, separated and stored in the magnesium ammonium phosphate bin in the first precipitation tank assembly, the waste liquid flowing out of the first precipitation tank assembly is adjusted in pH value again through lime, the generated calcium carbonate precipitate is reacted with orthophosphate in the waste water to generate calcium phosphate, the waste water after the second treatment is adjusted in pH value for the third time, the residual calcium ions in the waste water are reacted with sulfuric acid to generate calcium sulfate, at the moment, the waste water can reach the standard and be discharged, the calcium phosphate and the calcium sulfate generated in the waste water treatment process fully stir N, P, K fertilizers provided in the nitrogen source bin, the phosphorus source bin and the potassium source bin, wherein the calcium phosphate and the calcium sulfate have the bonding effect, the fertilizer is granulated to prepare a primary compound fertilizer, the primary compound fertilizer acts with the sprayed magnesium ammonium phosphate solution in a third dryer, the magnesium ammonium phosphate is wrapped on the outer layer of the primary compound fertilizer as a coating slow release agent, so that the compound slow release fertilizer containing multiple elements such as N, P, K, Mg, Ca, S and the like is obtained, secondary waste liquid and waste residue are not generated in the whole process, and all effective elements in the waste water are fully utilized, the treatment efficiency is high, and the effect is good.
Preferably, the method comprises the following steps:
the compound fertilizer granulator is also connected with an ammonia water tank and a sulfuric acid tank, and ammonia water in the ammonia water tank and sulfuric acid in the sulfuric acid tank enter the compound fertilizer granulator through the same tubular reactor. By adopting the structure, ammonia water and sulfuric acid are controlled by the flow meter to enter the compound fertilizer granulator according to a certain proportion, and the ammonia water and the sulfuric acid react to generate a large amount of heat and a small amount of moisture, so that the components can be conveniently coated into granules.
And a cooling machine is connected between the compound fertilizer storage bin and the third drying machine, and materials coming out of the third drying machine are cooled by the cooling machine and then enter the compound fertilizer storage bin for storage. By adopting the structure, the fertilizer can be cooled to normal temperature by the cooler and then stored.
Above-mentioned first precipitation tank subassembly with still be equipped with a solid-liquid separation equipment between the magnesium ammonium phosphate feed bin, the slag notch of first precipitation tank subassembly with first solid-liquid separation equipment's feed inlet is connected, first solid-liquid separation equipment's slag notch is connected with first desiccator, and this first desiccator is connected with the magnesium ammonium phosphate feed bin, first solid-liquid separation equipment's liquid outlet with the dense groove of second is connected, first solid-liquid separation equipment's slag notch still through the alternative pipeline with the magnesium ammonium phosphate dissolving tank is connected, the magnesium ammonium phosphate dissolving tank is connected with rare phosphoric acid jar. By adopting the structure, the produced magnesium ammonium phosphate can be stored for a long time after solid-liquid separation and drying, and the wastewater separated from the magnesium ammonium phosphate sludge enters the system again for cyclic utilization, so that on one hand, all the wastewater can be discharged up to the standard, and on the other hand, the full utilization of effective substances in the wastewater is facilitated; in some cases, the magnesium ammonium phosphate with certain moisture from the first solid-liquid separation device can be directly sprayed into the third dryer with a spray gun after being heated and dissolved in a magnesium ammonium phosphate dissolving tank together with dilute phosphoric acid.
And a flocculation sedimentation tank is also arranged between the second pH adjusting tank and the second sedimentation tank assembly, and is communicated with the second pH adjusting tank and the second sedimentation tank assembly, and the flocculation sedimentation tank is connected with a PAC (polyaluminium chloride) bin and a PAM (polyacrylamide) bin. By adopting the structure, after the pH is adjusted for the second time and before the dense precipitation, PAC (polyaluminium chloride) and PAM (polyacrylamide) are added for synergistic precipitation, which is beneficial to improving the precipitation separation effect.
The first sedimentation tank assembly comprises a first dense tank and a second dense tank which are communicated with each other, the stirring reaction tank is connected with a water inlet of the first dense tank, a water outlet of the second dense tank is connected with the second pH adjusting tank, and slag outlets of the first dense tank and the second dense tank are connected with the first solid-liquid separation device. By adopting the structure, the sedimentation effect is promoted through multi-stage sedimentation.
The second sedimentation tank assembly comprises a third dense tank and a fourth dense tank which are communicated with each other, a water outlet of the flocculation sedimentation tank is connected with a water inlet of the third dense tank, a water outlet of the fourth dense tank is connected with the third pH adjusting tank, and slag outlets of the third dense tank and the fourth dense tank are connected with the calcium sulfate and calcium phosphate bin. By adopting the structure, the sedimentation effect is promoted through multi-stage sedimentation.
A second solid-liquid separation device is further arranged between the second sedimentation tank assembly and the calcium sulfate and calcium phosphate bin, a slag outlet of the third dense tank, the fourth dense tank and the third pH adjusting tank is connected with a feed inlet of the second solid-liquid separation device, a slag outlet of the second solid-liquid separation device is connected with a second dryer, the second dryer is connected with the calcium sulfate and calcium phosphate bin, and a liquid outlet of the second solid-liquid separation device is connected with the third pH adjusting tank. By adopting the structure, the generated calcium sulfate and calcium phosphate can be preserved for a long time after solid-liquid separation and drying, and the waste water generated in the process flows back to the system further, so that all the waste water is discharged after reaching the standard.
The first pH adjusting tank is connected with a sodium hydroxide bin, and sodium hydroxide in the sodium hydroxide bin is dissolved and then is fed into the first pH adjusting tank through a first metering pump. By adopting the structure, the pH value of the first pH adjusting tank is adjusted to 8-8.5 by the sodium hydroxide, thereby being beneficial to the smooth proceeding of the reaction.
The first solid-liquid separation device and the second solid-liquid separation device are filter presses or centrifuges.
Compared with the prior art, the beneficial effects of the utility model are that: the waste water produced in the phosphorization and ammonization factory, wherein nitrogen ammonia, total phosphorus and the like are converted into magnesium ammonium phosphate, calcium phosphate and calcium sulfate, the reaction is complete and rapid, the magnesium ammonium phosphate is further used as a coating slow release agent, the calcium phosphate and the calcium sulfate are used as adhesives to be mixed with other N, P, K fertilizers to prepare the compound slow release fertilizer, the fertilizer contains multiple elements of N, P, K, Mg, Ca and S, is not easy to absorb moisture and agglomerate, can be used as a multifunctional compound fertilizer for base fertilizer, additional fertilizer, seed fertilizer and flushing application, can be used for multiple crops and economic crops, and the treated waste water can completely reach the discharge standard specified by the state.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings.
As shown in fig. 1, a system for producing a compound slow-release fertilizer by using wastewater from phosphorus chemical industry production comprises a wastewater pool 1, a first pH adjusting pool 2, a stirring reaction tank 3 and a first precipitation tank assembly which are connected in sequence, wherein the stirring reaction tank 3 is connected with a magnesium oxide bin 17, magnesium oxide in the magnesium oxide bin 17 is fed into the stirring reaction tank 3 through a first spiral scale 18, a water outlet of the first precipitation tank assembly is connected with a second pH adjusting pool 9, and a slag outlet of the first precipitation tank assembly is connected with an ammonium magnesium phosphate bin 8;
the second pH adjusting tank 9 is connected with a lime bin 25, lime in the lime bin 25 is conveyed into the second pH adjusting tank 9 through a second spiral scale 26, the second pH adjusting tank 9 is further connected with a second settling tank assembly, a water outlet of the second settling tank assembly is connected with a third pH adjusting tank 14, the third pH adjusting tank 14 is connected with a dilute sulfuric acid storage tank 43, dilute sulfuric acid in the dilute sulfuric acid storage tank 43 is conveyed into the third pH adjusting tank 14 through a second metering pump 24, and slag outlets of the second settling tank assembly and the third pH adjusting tank 14 are connected with a calcium sulfate and calcium phosphate bin 12;
the calcium sulfate and calcium phosphate bin 12 is connected with a mixing and stirring tank 30, the feed inlet of the mixing and stirring tank 30 is also connected with a nitrogen source bin 32, a phosphorus source bin 33 and a potassium source bin 34, ammonium chloride or urea is stored in the nitrogen source bin 32, monoammonium phosphate or diammonium phosphate is stored in the phosphorus source bin 33, potassium chloride is stored in the potassium source bin 34, the raw materials in the nitrogen source bin 32, the phosphorus source bin 33 and the potassium source bin 34 are respectively conveyed into the mixing and stirring tank 30 by a metering belt scale, a discharge hole of the mixing and stirring tank 30 is connected with a compound fertilizer granulator 35, the compound fertilizer granulator 35 is connected with a third dryer 36, the magnesium ammonium phosphate bin 8 is connected with a magnesium ammonium phosphate dissolving tank 44, the magnesium ammonium phosphate dissolving tank 44 is connected with the third dryer 36 through a spray gun 31, and the third dryer 36 is connected with a compound fertilizer storage bin 38.
The first pH adjusting tank 2 is connected to a sodium hydroxide bin 15, and sodium hydroxide in the sodium hydroxide bin 15 is dissolved in a sodium hydroxide dissolving tank 29 and then is fed into the first pH adjusting tank 2 by a first metering pump 16.
The first sedimentation tank component comprises a first dense tank 4 and a second dense tank 5 which are communicated with each other, the stirring reaction tank 3 is connected with a water inlet of the first dense tank 4, the water outlet of the second dense trough 5 is connected with the second pH adjusting pool 9, the slag outlets of the first dense trough 4 and the second dense trough 5 are connected with the magnesium ammonium phosphate bin 8, in the embodiment, a first solid-liquid separation device 6 is also arranged between the first sedimentation tank component and the magnesium ammonium phosphate bin 8, the slag outlets of the first dense trough 4 and the second dense trough 5 are connected with the feed inlet of the first solid-liquid separation device 6, the slag outlet of the first solid-liquid separation device 6 is connected with a first dryer 7, the first dryer 7 is connected with the magnesium ammonium phosphate bin 8, and the liquid outlet of the first solid-liquid separation device 6 is connected with the second dense tank 5.
Still be equipped with flocculation and precipitation pond 10 between second pH equalizing basin 9 and the second sedimentation tank subassembly, this flocculation and precipitation pond 10 will second pH equalizing basin 9 and second sedimentation tank subassembly intercommunication, flocculation and precipitation pond 10 is connected with PAC feed bin 19 and PAM feed bin 22, wherein PAC in the PAC feed bin 19 is sent into through third measuring pump 21 after carrying to PAC dissolving tank 20 through the spiral, PAM in the PAM feed bin 22 is sent into behind carrying to PAM dissolving tank 23 through fourth measuring pump 24 flocculation and precipitation pond 10 through spiral.
The second settling tank assembly comprises a third dense tank 11 and a fourth dense tank 13 which are communicated with each other, the water outlet of the flocculation sedimentation tank 10 is connected with the water inlet of the third dense trough 11, the water outlet of the fourth dense trough 13 is connected with the third pH adjusting tank 14, the slag outlets of the third and fourth dense troughs 11, 13 are connected to the calcium sulfate and calcium phosphate silo 12, which, in this embodiment, a second solid-liquid separation device 27 is also arranged between the second settling tank assembly and the calcium sulfate and calcium phosphate silo 12, the slag outlets of the third dense trough 11, the fourth dense trough 13 and the third pH adjusting tank 14 are connected with the feed inlet of a second solid-liquid separation device 27, the slag outlet of the second solid-liquid separation device 27 is connected with a second dryer 28, the second dryer 28 is connected with the calcium sulfate and calcium phosphate bin 12, the liquid outlet of the second solid-liquid separation device 27 is connected with the third pH adjusting tank 14.
The first solid-liquid separation device 6 and the second solid-liquid separation device 27 are filter presses or centrifuges.
In order to save the processing time, the slag outlet of the first solid-liquid separation device 6 is also connected with the magnesium ammonium phosphate dissolution tank 44 through an alternative pipeline, and the magnesium ammonium phosphate dissolution tank 44 is connected with a diluted phosphoric acid tank 42.
As can also be seen from the figure, the compound fertilizer granulator 35 is further connected with an ammonia water tank 39 and a sulfuric acid tank 40, ammonia water in the ammonia water tank 39 and sulfuric acid in the sulfuric acid tank 40 enter the compound fertilizer granulator 35 through the same tubular reactor 41, a cooler 37 is connected between the compound fertilizer storage bin 38 and the third dryer 36, and materials coming out of the third dryer 36 are cooled by the cooler 37 and then enter the compound fertilizer storage bin 38 for storage.
When the method is used, the ammonia nitrogen content of the wastewater in an ammonium phosphate chemical plant is about 300-8000 mg/L, the total phosphorus content (mainly existing in phosphate radical ion salts) is about 5000-8000mg/L, the pH value is 2-3, the wastewater is concentrated in a wastewater pool 1, the pH value is adjusted to 8-8.5 through a first pH adjusting pool 2, and the wastewater enters a stirring reaction tank 3 and then reacts with added magnesium oxide, wherein the reaction formula is as follows:
Mg2++H2PO4-+NH4++6H2O＝MgNH4PO4·6H2O+2H+
after the generated double-salt magnesium ammonium phosphate is separated by the first sedimentation tank assembly, the wastewater enters the second pH adjusting tank 9, the lime put into the tank firstly reacts with the moderate acidity of the wastewater to produce calcium bicarbonate, the lime is continuously added to produce calcium carbonate, when the pH value of the wastewater is more than 9.5, the calcium carbonate reacts with phosphate to produce calcium phosphate, the calcium phosphate is precipitated and separated in the second sedimentation tank assembly under the synergistic precipitation of PAC and PAM, the rest wastewater also contains a small amount of excessive calcium ions, the partial calcium ions enter the third pH adjusting tank 14 and then react with dilute sulfuric acid in the tank to produce calcium sulfate, at the moment, the nitrogen-ammonia content of the wastewater is less than 35mg/L, the total phosphorus content is less than 15mg/L, and the discharge standard is met.
The obtained calcium sulfate and calcium phosphate are used as adhesives to enter a mixing and stirring tank 30, and are fully stirred with other added raw materials to form a granular compound fertilizer, and the compound fertilizer enters a third dryer 36 to react with the sprayed magnesium ammonium phosphate solution and is wrapped to form the compound slow-release fertilizer.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and the scope of the present invention.
Claims (10)
1. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater is characterized in that: the device comprises a wastewater pool (1), a first pH adjusting pool (2), a stirring reaction tank (3) and a first sedimentation tank assembly which are sequentially connected, wherein the stirring reaction tank (3) is connected with a magnesium oxide bin (17), a water outlet of the first sedimentation tank assembly is connected with a second pH adjusting pool (9), and a slag outlet of the first sedimentation tank assembly is connected with an ammonium magnesium phosphate bin (8);
the second pH adjusting tank (9) is connected with a lime bin (25), the second pH adjusting tank (9) is also connected with a second settling tank assembly, a water outlet of the second settling tank assembly is connected with a third pH adjusting tank (14), the third pH adjusting tank (14) is connected with a dilute sulfuric acid storage tank (43), and slag outlets of the second settling tank assembly and the third pH adjusting tank (14) are connected with a calcium sulfate and calcium phosphate bin (12);
calcium sulfate and calcium phosphate feed bin (12) are connected with mixing agitator tank (30), and the feed inlet of this mixing agitator tank (30) still is connected with nitrogen source feed bin (32), phosphorus source feed bin (33) and potassium source feed bin (34), the discharge gate of mixing agitator tank (30) is connected with compound fertilizer granulator (35), compound fertilizer granulator (35) is connected with third desiccator (36), magnesium ammonium phosphate feed bin (8) are connected with magnesium ammonium phosphate dissolving tank (44), this magnesium ammonium phosphate dissolving tank (44) through spray gun (31) with third desiccator (36) are connected, third desiccator (36) are connected with compound fertilizer storage storehouse (38).
2. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 1, which is characterized in that: the compound fertilizer granulator (35) is also connected with an ammonia water tank (39) and a sulfuric acid tank (40), and ammonia water in the ammonia water tank (39) and sulfuric acid in the sulfuric acid tank (40) enter the compound fertilizer granulator (35) through the same tubular reactor (41).
3. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 1 or 2, wherein: a cooling machine (37) is connected between the compound fertilizer storage bin (38) and the third drying machine (36), and materials discharged from the third drying machine (36) are cooled by the cooling machine (37) and then enter the compound fertilizer storage bin (38) for storage.
4. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 3, wherein the system comprises: first precipitation tank subassembly with still be equipped with first solid-liquid separation equipment (6) between magnesium ammonium phosphate feed bin (8), the slag notch of first precipitation tank subassembly with the feed inlet of first solid-liquid separation equipment (6) is connected, the slag notch of first solid-liquid separation equipment (6) is connected with first desiccator (7), and this first desiccator (7) are connected with magnesium ammonium phosphate feed bin (8), the liquid outlet and the second dense groove (5) of first solid-liquid separation equipment (6) are connected, the slag notch of first solid-liquid separation equipment (6) still through alternative pipeline with magnesium ammonium phosphate dissolving tank (44) are connected, magnesium ammonium phosphate dissolving tank (44) are connected with rare phosphoric acid jar (42).
5. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 4, wherein the system comprises: still be equipped with flocculation and precipitation pond (10) between second pH equalizing basin (9) and the second sedimentation tank subassembly, this flocculation and precipitation pond (10) will second pH equalizing basin (9) and second sedimentation tank subassembly intercommunication, flocculation and precipitation pond (10) are connected with PAC feed bin (19) and PAM feed bin (22).
6. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 4, wherein the system comprises: the first sedimentation tank assembly comprises a first dense tank (4) and a second dense tank (5) which are communicated with each other, the stirring reaction tank (3) is connected with a water inlet of the first dense tank (4), a water outlet of the second dense tank (5) is connected with the second pH adjusting tank (9), and slag outlets of the first dense tank (4) and the second dense tank (5) are connected with the first solid-liquid separation device (6).
7. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 5, wherein the system comprises: the second sedimentation tank assembly comprises a third dense tank (11) and a fourth dense tank (13) which are communicated with each other, a water outlet of the flocculation sedimentation tank (10) is connected with a water inlet of the third dense tank (11), a water outlet of the fourth dense tank (13) is connected with the third pH adjusting tank (14), and slag outlets of the third dense tank (11) and the fourth dense tank (13) are connected with the calcium sulfate and calcium phosphate bin (12).
8. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 7, wherein the system comprises: still be equipped with second solid-liquid separation equipment (27) between second precipitation tank subassembly and calcium sulfate and calcium phosphate feed bin (12), third dense groove (11), fourth dense groove (13) and the slag notch of third pH equalizing basin (14) is connected with the feed inlet of second solid-liquid separation equipment (27), second desiccator (28) is connected to the slag notch of second solid-liquid separation equipment (27), second desiccator (28) with calcium sulfate and calcium phosphate feed bin (12) are connected, the liquid outlet of second solid-liquid separation equipment (27) with third pH equalizing basin (14) are connected.
9. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 1, which is characterized in that: the first pH adjusting tank (2) is connected with a sodium hydroxide bin (15), and sodium hydroxide in the sodium hydroxide bin (15) is dissolved and then is fed into the first pH adjusting tank (2) through a first metering pump (16).
10. The system for producing the compound slow-release fertilizer by utilizing the phosphorus chemical industry production wastewater as claimed in claim 8, wherein the system comprises: the first solid-liquid separation device (6) and the second solid-liquid separation device (27) are filter presses or centrifuges.
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