System for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate

Abstract

The utility model relates to a system for preparing a nitrogen-phosphorus compound fertilizer and industrial nickel sulfate, which comprises a flocculation impurity removal mechanism for adjusting the pH value of chemical nickel wastewater and removing impurities, an exchange transformation mechanism communicated with the flocculation impurity removal mechanism and used for carrying out ion exchange, and an extraction impurity removal mechanism communicated with a nickel-rich solution outlet of the exchange transformation mechanism, the system comprises an exchange transformation mechanism, an extraction and impurity removal mechanism communicated with the exchange transformation mechanism, a post-exchange liquid component adjustment mechanism communicated with a post-exchange liquid outlet of the exchange transformation mechanism, a concentration, evaporation and crystallization mechanism communicated with the extraction and impurity removal mechanism to prepare industrial nickel sulfate, and a concentration and drying mechanism communicated with the post-exchange liquid component adjustment mechanism to prepare a nitrogen-phosphorus compound fertilizer. A large amount of nitrogen-phosphorus organic compound fertilizer is obtained, and high-purity industrial nickel sulfate is also obtained.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of sewage treatment, especially relates to a system for preparing nitrogen and phosphorus compound fertilizer and industrial nickel sulfate. BACKGROUND

[0002] Compared with traditional electroplating technology, the chemical nickel plating technology has uniform plating thickness and saves electric energy, and can be used for plating even if the plated part is not conductive, and has magnetism and the like, and is widely used in the fields of petroleum chemical industry, machinery manufacturing and aerospace and the like. In addition to nickel sulfate, nickel chloride and other nickel sources, the chemical nickel plating solution also contains a large amount of hypophosphite complexing agent, organic acid complexing agent and other organic additives with different functions, and therefore the chemical nickel plating solution generally has a high COD (chemical oxygen demand), and the nickel exists in the form of a complex, and it is very difficult to remove the nickel and recover the nickel.

[0003] At present, the treatment processes for the chemical nickel plating solution mainly include a precipitation method and an oxidation-reduction method. The precipitation method is to remove the nickel ions in the waste solution by adding a reagent capable of combining with Ni2+ to generate a precipitate after oxidation and breaking of the complex, and the commonly used precipitants include NaOH, CaO and the like. Although this method can fully remove the nickel ions in the waste solution, the amount of sludge is large, which causes waste of resources and brings additional solid waste. The oxidation-reduction method is to first add an oxidizing agent to break the complex, that is, to oxidize the phosphite and hypophosphite to orthophosphate, and the organic matter in the waste solution competes with the complexing agent when meeting the oxidizing agent, and therefore sufficient oxidizing agent needs to be provided to simultaneously oxidize the organic matter and break the complex. Although the commonly used high-efficiency oxidation processes such as Fenton oxidation method, Fenton-like oxidation method, permanganate oxidation method and ferrate oxidation method have the advantages of simple operation and complete oxidation of hypophosphite and part of COD, the commonly used reagent oxidation method has the disadvantages of high price, low utilization rate of oxidizing agent, need to introduce a large amount of metal salt and acid-base reagent, increase of the sludge amount of waste water, great increase of the environmental protection pressure and operating cost of enterprises, and the traditional oxidation-reduction method and precipitation method cannot realize the recycling of waste water, which causes waste of resources.

[0004] Therefore, in view of the above technical problems, the system for preparing nitrogen and phosphorus compound fertilizer and industrial nickel sulfate is designed, the ion exchange technology is used to enrich the nickel ions, and the recycling of the nickel resource and the phosphorus resource in the chemical nickel plating waste water is realized on the basis of reducing the sludge yield, which is a technical problem to be solved by the person skilled in the art. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems, the utility model provides a kind of preparation nitrogen phosphorus compound fertilizer and industrial nickel sulfate's system, to chemical plating nickel-containing wastewater as raw material, overcome the traditional chemical precipitation method sludge amount, and sludge nickel cannot be recycled and reused, cause the waste of resources and bring additional solid waste etc.

[0006] To achieve the above object, the utility model provides the following scheme:

[0007] A kind of preparation nitrogen phosphorus compound fertilizer and industrial nickel sulfate's system, including the flocculation impurity removal mechanism of adjusting pH value and impurity removal to chemical nickel wastewater, with the exchange transformation mechanism for carrying out ion exchange with the flocculation impurity removal mechanism communication, with the extraction impurity removal mechanism of nickel-rich solution outlet communication of the exchange transformation mechanism, with the post-interchange liquid component adjustment mechanism of post-interchange liquid outlet communication of the exchange transformation mechanism, with the concentration evaporation crystallization mechanism of industrial nickel sulfate preparation with the extraction impurity removal mechanism communication, and with the concentration drying mechanism of nitrogen phosphorus compound fertilizer preparation with the post-interchange liquid component adjustment mechanism communication.

[0008] Preferably, the flocculation impurity removal mechanism includes chemical nickel wastewater adjusting tank with chemical nickel wastewater inlet, first liquid alkali tank with the chemical nickel wastewater adjusting tank communication and multi-medium filter with the chemical nickel wastewater adjusting tank water outlet communication, the supernatant outlet is provided on the multi-medium filter with the exchange transformation mechanism communication.

[0009] Preferably, the exchange transformation mechanism includes ion exchange column for adsorbing ion, and acid analysis liquid preparation tank with the ion exchange column communication, the supernatant inlet is provided on the ion exchange column with the supernatant outlet communication, and the nickel-rich solution outlet and the post-interchange liquid outlet are all arranged on the ion exchange column.

[0010] Preferably, the post-interchange liquid component adjustment mechanism includes post-interchange liquid adjusting tank with the post-interchange liquid outlet communication, and ammonia water preparation tank with the post-interchange liquid adjusting tank communication, the post-interchange liquid adjusting tank with the concentration drying mechanism communication.

[0011] Preferably, the concentration drying mechanism includes concentration device with the post-interchange liquid adjusting tank communication to concentrate post-interchange liquid, first drying device with the concentration device communication.

[0012] Preferably, the concentration device is further provided with steam outlet, and the steam outlet is communicated with condenser.

[0013] Preferably, the impurity-removing mechanism comprises a thick liquid adjusting tank and a settling extractor connected in sequence, the thick liquid adjusting tank is connected with the second liquid alkali tank, the settling extractor is connected with the extracted oil storage tank, and the bottom of the settling extractor is connected with the thickening evaporation crystallization mechanism.

[0014] Preferably, a stirring device is arranged in the settling extractor.

[0015] Preferably, the settling extractor is connected with the extracted oil storage tank.

[0016] Preferably, the thickening evaporation crystallization mechanism comprises an evaporation thickening device and a second drying device which are connected in sequence to concentrate and dry the nickel ion thick liquid after impurity removal, and the evaporation thickening device is connected with the settling extractor.

[0017] The utility model discloses the following technical effects are obtained relative to prior art:

[0018] By the chemical plating nickel-containing wastewater is removed in the flocculation impurity-removing mechanism in proper order, and the ion exchange is carried out in the exchange transformation mechanism, and the solution rich in nickel element is adjusted in PH value, and the extracted impurity-removing mechanism is extracted, and then is concentrated and dried through the thickening evaporation crystallization mechanism to prepare high-purity industrial nickel sulfate, and the post-exchange liquid containing nitrogen and phosphorus elements is adjusted in PH value through the post-exchange liquid component adjusting mechanism, and is concentrated and dried through the thickening drying mechanism, to obtain nitrogen-phosphorus compound organic fertilizer, and the abandoned nickel resource is effectively utilized, and a large amount of nitrogen-phosphorus organic compound fertilizer is obtained, and high-purity industrial nickel sulfate is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying the creativity labor.

[0020] ATTACHMENT Figure 1 The system flow chart schematic diagram for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiment of the utility model is prepared;

[0021] ATTACHMENT Figure 2 The flocculation impurity-removing mechanism structure schematic diagram of the system for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiment of the utility model is prepared;

[0022] ATTACHMENT Figure 3 The exchange transformation mechanism structure schematic diagram of the system for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiment of the utility model is prepared;

[0023] ATTACHMENT Figure 4The system post-exchange liquid component adjusting mechanism structure schematic view for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiments of the present application is shown in the figure.

[0024] The system post-exchange liquid component adjusting mechanism structure schematic view for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiments of the present application is shown in the figure. Figure 5 The system post-exchange liquid component adjusting mechanism structure schematic view for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiments of the present application is shown in the figure.

[0025] The system post-exchange liquid component adjusting mechanism structure schematic view for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiments of the present application is shown in the figure. Figure 6 The system post-exchange liquid component adjusting mechanism structure schematic view for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiments of the present application is shown in the figure.

[0026] The system post-exchange liquid component adjusting mechanism structure schematic view for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiments of the present application is shown in the figure. Figure 7 The system post-exchange liquid component adjusting mechanism structure schematic view for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed by the embodiments of the present application is shown in the figure.

[0027] 1, flocculation impurity removal mechanism; 2, exchange transformation mechanism; 3, post-exchange liquid component adjusting mechanism; 4, concentration drying mechanism; 5, extraction impurity removal mechanism; 6, concentration evaporation crystallization mechanism; 7, nickel chemical wastewater inlet; 8, nickel chemical wastewater adjusting tank; 9, wastewater lifting pump; 10, multi-medium filter; 11, supernatant outlet; 12, first liquid alkali lifting pump; 13, first liquid alkali tank; 14, ion exchange column; 15, analysis liquid lifting pump; 16, acid analysis liquid preparation tank; 17, supernatant inlet; 18, nickel-rich solution outlet; 19, post-exchange liquid outlet; 20, post-exchange liquid adjusting tank; 21, ammonia water lifting pump; 22, ammonia water preparation tank; 23, post-exchange liquid lifting pump; 24, concentration device; 25, first drying device; 26, condenser; 27, nitrogen-phosphorus compound fertilizer outlet; 28, concentrated liquid adjusting tank; 29, settling extractor; 30, second liquid alkali tank; 31, second liquid alkali pump; 32, concentrated liquid lifting pump; 33, extraction oil storage tank; 34, extraction oil pump; 35, evaporation concentration device; 36, second drying device; 37, industrial nickel sulfate outlet. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] The utility model discloses a system for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate, which uses nickel-containing electroless plating wastewater as raw material, overcomes the shortcomings of traditional chemical precipitation method, such as large amount of sludge, unrecoverable nickel in the sludge, resource waste and additional solid waste, effectively utilizes the abandoned nickel resource, and obtains a large amount of nitrogen-phosphorus organic compound fertilizer and industrial nickel sulfate.

[0030] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below in combination with the drawings and specific embodiments.

[0031] Reference Figures 1-7 The system for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate disclosed in the embodiments of the utility model at least comprises a flocculation and impurity removal mechanism 1 for adjusting the pH value of nickel-containing electroless plating wastewater and removing impurities from the wastewater, an exchange transformation mechanism 2 for ion exchange of the nickel-containing electroless plating wastewater after impurity removal, the exchange transformation mechanism 2 is provided with a nickel-rich solution outlet 18 and an after-exchange liquid outlet 19, the nickel-rich solution outlet 18 is in communication with an extraction and impurity removal mechanism 5 and a concentration and evaporation crystallization mechanism 6 in sequence, the after-exchange liquid outlet 19 is in communication with an after-exchange liquid component adjustment mechanism 3 and a concentration and drying mechanism 4 in sequence, the nickel-containing electroless plating wastewater is sequentially subjected to impurity removal by the flocculation and impurity removal mechanism 1, ion exchange by the exchange transformation mechanism 2, PH value adjustment and extraction and impurity removal by the extraction and impurity removal mechanism 5, and concentration and drying by the concentration and evaporation crystallization mechanism 6 to prepare high-purity industrial nickel sulfate, the after-exchange liquid containing nitrogen and phosphorus elements is subjected to PH value adjustment by the after-exchange liquid component adjustment mechanism 3 and concentration and drying by the concentration and drying mechanism 4 to obtain nitrogen-phosphorus compound organic fertilizer, the abandoned nickel resource is effectively utilized, a large amount of nitrogen-phosphorus organic compound fertilizer is obtained, and high-purity industrial nickel sulfate is also obtained.

[0032] Reference Figure 2As an implementation form, the flocculation impurity removal mechanism 1 comprises a nickel plating wastewater adjusting tank 8 provided with a nickel plating wastewater inlet 7, the nickel plating wastewater adjusting tank 8 is communicated with a first liquid alkali tank 13 through a first liquid alkali lifting pump 12, and the nickel plating wastewater adjusting tank 8 is communicated with a multi-medium filter 10 through a wastewater lifting pump 9, the multi-medium filter 10 is provided with a supernatant outlet 11 communicated with the exchange transformation mechanism 2, the nickel plating wastewater enters the nickel plating wastewater adjusting tank 8 through the nickel plating wastewater inlet 7, then the first liquid alkali tank 13 sends liquid alkali to the nickel plating wastewater adjusting tank 8, so that the PH value in the nickel plating wastewater adjusting tank 8 reaches 2-4, so that the nickel plating wastewater can be ion exchanged in the exchange transformation mechanism 2, then the wastewater lifting pump 9 sends the nickel plating wastewater with adjusted PH value to the multi-medium filter 10, the impurities in the nickel plating wastewater are precipitated and filtered, the precipitated sludge is discharged, so that the supernatant needing subsequent treatment is obtained, and the supernatant is sent to the exchange transformation mechanism 2 through the supernatant outlet 11.

[0033] Reference Figure 3 As an implementation form, the exchange transformation mechanism 2 comprises an ion exchange column 14 for ion exchanging the supernatant, the ion exchange column 14 is communicated with an acid elution liquid configuration tank 16 through an elution liquid lifting pump 15, the ion exchange column 14 is further provided with a supernatant inlet 17 communicated with the supernatant outlet 11, a nickel-rich solution outlet 18 and an after-exchange liquid outlet 19 are arranged on the ion exchange column 14, after the supernatant after impurity removal enters the ion exchange column 14, the supernatant after impurity removal is ion exchanged with the ion exchange column 14, the resin in the ion exchange column 14 can adsorb the nickel in the complex state to the resin to displace the cations on the resin, so that the resin adsorbs the nickel ions to saturation, and the after-exchange liquid is rich in phosphate and hypophosphite, and the after-exchange liquid rich in phosphate and hypophosphite is sent to the after-exchange liquid component adjustment mechanism 3, then the elution liquid lifting pump 15 sends 1-1.5 mol / L hydrochloric acid in the acid elution liquid configuration tank 16 to the ion exchange column 14, so as to displace and replace the nickel ions enriched on the ion exchange column 14, under the condition, the hydrogen ions in the hydrochloric acid displace the nickel ions on the exchange resin to enter the elution liquid, at this time, the nickel is in an ionic state, and is sent to the extraction impurity removal mechanism 5 through the elution liquid outlet.

[0034] Reference Figure 4 As an implementation form, the after-exchange liquid component adjustment mechanism 3 comprises an after-exchange liquid adjusting tank 20 communicated with the after-exchange liquid outlet 19, the after-exchange liquid adjusting tank 20 is communicated with an ammonia water configuration tank 22 through an ammonia water lifting pump 21, and the after-exchange liquid adjusting tank 20 is communicated with a concentration drying mechanism 4 through an after-exchange liquid lifting pump 23, after the after-exchange liquid enters the after-exchange liquid adjusting tank 20, the ammonia water configuration tank 22 pumps ammonia water into the after-exchange liquid adjusting tank 20 through the ammonia water lifting pump 21 to a PH value of 6-9, so as to ensure that the generated nitrogen-phosphorus organic compound fertilizer has suitable pH value, and the after-exchange liquid with adjusted components is pumped to the concentration drying mechanism 4 through the after-exchange liquid lifting pump 23.

[0035] Reference Figure 5 As an embodiment, the concentration drying mechanism 4 comprises a concentration device 24 in communication with the post-interaction liquid adjusting tank 20 to concentrate the post-interaction liquid, and a first drying device 25 in communication with the concentration device 24. The post-interaction liquid with adjusted components is evaporated and concentrated by the concentration device 24, and the concentration ratio is 1.4-1.5 g / cm 3 The concentrated liquid is introduced into the first drying device 25, and is subjected to drum drying or spray drying by the first drying device 25, and is discharged through the nitrogen-phosphorus compound fertilizer outlet 27 to obtain the nitrogen-phosphorus compound organic fertilizer.

[0036] It should be noted that a heater can be arranged on the concentration device 24 to evaporate and concentrate the post-interaction liquid.

[0037] Reference Figure 5 In an embodiment, the concentration device 24 is further provided with a steam outlet in communication with a condenser 26. By connecting the steam outlet with the condenser 26, the condensed water after evaporation of the post-interaction liquid can be collected and treated, avoiding environmental pollution caused by direct discharge of steam.

[0038] Reference Figure 6 In an embodiment, the extraction and impurity removal mechanism 5 comprises a concentrated liquid adjusting tank 28 and a settling extractor 29 connected in sequence. The concentrated liquid adjusting tank 28 is in communication with a second liquid caustic tank 30 through a second liquid caustic pump 31, and the settling extractor 29 is in communication with an extraction oil storage tank 33 through an extraction oil pump 34. A concentrated liquid lifting pump 32 is arranged between the concentrated liquid adjusting tank 28 and the settling extractor 29. The bottom of the settling extractor 29 is in communication with the concentration evaporation crystallization mechanism 6. The resolved concentrated liquid flowing out of the nickel-rich solution outlet 18 of the ion exchange column 14 enters the concentrated liquid adjusting tank 28 through the concentrated liquid inlet, and then the liquid caustic in the second liquid caustic tank 30 is pumped into the concentrated liquid adjusting tank 28 by the second liquid caustic pump 31, so that the PH value of the concentrated liquid adjusting tank 28 is 2-5. The concentrated liquid with adjusted PH value is pumped into the settling extractor 29 by the concentrated liquid lifting pump 32, and the oil liquid in the extraction oil storage tank 33 is pumped into the extraction oil settling extractor 29 by the extraction oil pump 34. After stirring and mixing in the settling extractor 29, the lower layer of the impurity-removed concentrated liquid is connected to the concentration evaporation crystallization mechanism through the lower outlet. If the concentrations of Na+, Fe3+, and Cu2+ in the impurity-removed concentrated liquid are too high, the step can be repeated and different extraction oils can be used to achieve the purpose of extraction and impurity removal.

[0039] Reference Figure 6 In an embodiment, a stirring device is arranged in the settling extractor 29, and preferably a stirring blade is arranged in the settling extractor 29. The stirring blade is driven by a motor to realize mixing and stirring of the liquid in the settling extractor 29.

[0040] Reference Figure 6In one embodiment, the settling extractor 29 is connected to an extraction oil storage tank 33, and after the upper layer extraction oil is mixed and separated by the settling extractor 29, the upper layer extraction oil can be pumped to the extraction oil storage tank 33 by an extraction oil pump 34 for reuse, thereby avoiding waste of materials.

[0041] Reference Figure 7 In one embodiment, the concentration evaporation crystallization mechanism 6 includes an evaporation concentration device 35 and a second drying device 36 for sequentially concentrating and drying the concentrated nickel ion solution after extraction and impurity removal, the evaporation concentration device 35 is connected to the outlet of the settling extractor 29, and when the concentrated nickel ion solution after extraction and impurity removal is concentrated to a specific gravity of 1-2 g / cm 3 in the evaporation concentration device 35, it is sent to the dryer (roller drying or spray drying) for drying, and high-purity industrial nickel sulfate is obtained from the industrial nickel sulfate outlet 37.

[0042] The utility model discloses a treatment process and method of electroless plating nickel-containing wastewater, which selects to enrich nickel ions by ion exchange technology, removes a large amount of impurities by extraction and impurity removal technology, and finally obtains high-purity industrial nickel sulfate by evaporation and crystallization. The treatment process and equipment of the utility model are simple, have good environmental protection benefits, are suitable for large-scale industrial production, and adopt more efficient treatment and recovery process for the electroless plating nickel-containing wastewater. In addition to obtaining industrial nickel sulfate, a large amount of hypophosphorous acid salt complexing agent in the post-exchange liquid can also be neutralized by adding ammonia to obtain a large amount of nitrogen-phosphorus composite salt solution, which can be used in the fertilizer industry after evaporation and crystallization. The treatment process and method of the utility model not only reduce the environmental protection pressure of enterprises, but also bring additional economic benefits. Compared with the traditional industry, the treatment process and method of the utility model greatly save the cost of chemical agents and greatly reduce the amount of sludge

[0043] Adaptive changes according to actual needs are within the protection scope of the utility model.

[0044] It should be noted that, for those skilled in the art, the utility model is obviously not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A system for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate, characterized in that, The device comprises a flocculation and impurity removal mechanism for adjusting the pH value and removing impurities of the nickel plating wastewater, an exchange transformation mechanism in communication with the flocculation and impurity removal mechanism for ion exchange, an extraction and impurity removal mechanism in communication with the exchange transformation mechanism for rich nickel solution outlet, a post-exchange liquid component adjustment mechanism in communication with the exchange transformation mechanism for post-exchange liquid outlet, a concentration and evaporation crystallization mechanism in communication with the extraction and impurity removal mechanism for preparing industrial nickel sulfate, and a concentration and drying mechanism in communication with the post-exchange liquid component adjustment mechanism for preparing nitrogen and phosphorus compound fertilizer.

2. The system for producing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate according to claim 1, characterized by, The flocculation and impurity removal mechanism comprises a nickel plating wastewater adjusting tank with a nickel plating wastewater inlet, a first liquid alkali tank in communication with the nickel plating wastewater adjusting tank, and a multi-medium filter in communication with the nickel plating wastewater adjusting tank outlet.

3. The system for producing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate according to claim 2, characterized by, The exchange transformation mechanism comprises an ion exchange column for adsorbing ions, and an acid elution liquid preparation tank in communication with the ion exchange column, the ion exchange column is provided with a supernatant inlet in communication with the supernatant outlet, and the rich nickel solution outlet and the post-exchange liquid outlet are both arranged on the ion exchange column.

4. The system for producing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate according to claim 3, characterized by, The post-exchange liquid component adjustment mechanism comprises a post-exchange liquid adjusting tank in communication with the post-exchange liquid outlet, and an ammonia water preparation tank in communication with the post-exchange liquid adjusting tank, and the post-exchange liquid adjusting tank is in communication with the concentration and drying mechanism.

5. The system for producing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate according to claim 4, characterized by, The concentration and drying mechanism comprises a concentration device in communication with the post-exchange liquid adjusting tank for concentrating the post-exchange liquid, and a first drying device in communication with the concentration device.

6. The system for preparing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate according to claim 5, characterized by, The concentration device is further provided with a steam outlet in communication with a condenser.

7. The system for preparing nitrogen and phosphorus compound fertilizer and industrial nickel sulfate according to claim 3, characterized by, The extraction and impurity removal mechanism comprises a concentrated liquid adjusting tank and a settling extractor in sequence, the concentrated liquid adjusting tank is in communication with a second liquid alkali tank, the settling extractor is in communication with an extraction oil storage tank, and the bottom of the settling extractor is in communication with the concentration and evaporation crystallization mechanism.

8. The system for producing nitrogen-phosphorus compound fertilizer and industrial nickel sulfate according to claim 7, characterized by, The settling extractor is provided with a stirring device.

9. The system for preparing nitrogen and phosphorus compound fertilizer and industrial nickel sulfate according to claim 7, characterized by, The settling extractor is in communication with the extraction oil storage tank.

10. The system for preparing nitrogen and phosphorus compound fertilizer and industrial nickel sulfate according to claim 7, characterized by, The concentration and evaporation crystallization mechanism comprises an evaporation concentration device and a second drying device for concentrating and drying the nickel ion concentrated liquid after extraction and impurity removal in sequence, and the evaporation concentration device is in communication with the settling extractor.

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