Device for producing ammonium magnesium phosphate compound fertilizer by using potassium phytate hydrolysis waste residues as raw materials

Abstract

The utility model discloses a device for producing an ammonium magnesium phosphate compound fertilizer by taking potassium phytate hydrolysis waste residues as raw materials, and relates to the field of magnesium-nitrogen-phosphorus compound fertilizers. An outlet of a waste residue tank is communicated with a pulping tank, an inlet of the pulping tank is communicated with a purified water tank through a pipeline, and an outlet of the pulping tank is communicated with a dissolving tank through a pipeline; an inlet of the dissolving tank is communicated with an acid liquor tank through a pipeline, an outlet of the dissolving tank is communicated with a first plate-and-frame filter press through a pipeline, a filtrate outlet of the first plate-and-frame filter press is communicated with a temporary storage tank through a pipeline, an outlet of the temporary storage tank is communicated with an adjusting tank through a pipeline, and an inlet of the adjusting tank is communicated with an alkali liquor tank through a pipeline. An outlet of the adjusting tank is communicated with a second plate-and-frame filter press through a pipeline; a filter residue outlet of the second plate-and-frame filter press is communicated with an ammonium magnesium phosphate crude product tank. The potassium phytate hydrolysis residues are recycled, raw material waste and environmental pollution caused by direct discharge are avoided, the economic benefits of the method are improved, and the method is environmentally friendly.

Description

Technical Field

[0001] The utility model relates to the field of magnesium-nitrogen-phosphorus compound fertilizers, in particular to a device for producing magnesium-ammonium phosphate compound fertilizers by taking potassium phytate hydrolysis waste residue as raw materials. Background Art

[0002] The properties of ammonium magnesium phosphate are white crystalline fine particles or powder, slightly soluble in cold water, soluble in hot water and dilute acid, insoluble in ethanol, and decomposed in alkaline solution. When heated to 100°C in air, it dehydrates into anhydrous substances; when further heated to 600°C, it decomposes into magnesium pyrophosphate; when its aqueous solution is heated to 48-50°C, monohydrate is precipitated. Ammonium magnesium phosphate is used as a feed additive and fertilizer additive. Ammonium magnesium phosphate is a multi-element compound fertilizer containing N, P, and Mg, and all ingredients are effective. It has extremely low solubility in water. Because it is citric acid soluble, it can store nitrogen in the soil after application, and gradually undergo nitrification under the action of microorganisms, slowly decompose, and provide plant nutrients. Different particle sizes have different nitrification rates, and the nutrient needs of crops can be met by controlling the particle size.

[0003] Potassium phytate hydrolysis residue is produced in the process of producing inositol potassium dihydrogen phosphate with corn soaking water, in which the water content of the hydrolysis residue is 50%, the inorganic phosphorus in the dry matter is 50%, the magnesium ion is 20%, and the calcium ion is 1%. The current common treatment method is to discharge it as waste residue, which reduces the resource utilization rate and causes certain pollution to the environment.

[0004] Chinese patent CN 102249769 A discloses a magnesium ammonium phosphate slow-release fertilizer and a preparation method thereof. The patent uses wastewater as a raw material to provide a magnesium ammonium phosphate slow-release fertilizer, which allows valuable resources such as nitrogen, phosphorus, rare earth, and magnesium in the wastewater to be effectively and low-cost recycled and utilized, not only solving the pollution problem of wastewater, but also effectively and low-cost recycling of valuable resources such as nitrogen, phosphorus, rare earth, and magnesium in the wastewater. However, although this method further utilizes waste materials, harmful substances such as heavy metals in the wastewater exceed the standard and are not completely removed, causing great environmental pollution. Summary of the invention

[0005] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a device is provided for producing magnesium ammonium phosphate compound fertilizer using potassium phytate hydrolysis waste residue as raw material, which improves resource utilization, increases economic benefits, and is environmentally friendly.

[0006] In order to solve the above technical problems, the technical solution of the utility model is:

[0007] A device for producing magnesium ammonium phosphate compound fertilizer using potassium phytate hydrolysis waste residue as raw material, comprising a waste residue tank, the outlet of the waste residue tank is connected to a pulping tank, the inlet of the pulping tank is connected to a purified water tank through a pipeline, the outlet of the pulping tank is connected to a dissolving tank through a pipeline, the inlet of the dissolving tank is connected to an acid tank through a pipeline, the outlet of the dissolving tank is connected to a first plate and frame filter press through a pipeline, the filtrate outlet of the first plate and frame filter press is connected to a temporary storage tank through a pipeline, the outlet of the temporary storage tank is connected to a regulating tank through a pipeline, the inlet of the regulating tank is connected to an alkali liquid tank through a pipeline, the outlet of the regulating tank is connected to a second plate and frame filter press through a pipeline, and the filter residue outlet of the second plate and frame filter press is connected to a crude magnesium ammonium phosphate tank.

[0008] As an improved technical solution, the outlet of the crude magnesium ammonium phosphate tank is connected to a dryer, and the outlet of the dryer is connected to a finished magnesium ammonium phosphate tank.

[0009] As an improved technical solution, the outlet of the crude magnesium ammonium phosphate tank is connected to a centrifuge, the solid phase outlet of the centrifuge is connected to the dryer, and the outlet of the dryer is connected to a finished magnesium ammonium phosphate tank.

[0010] As an improved technical solution, the liquid phase outlet of the centrifuge is connected to a mother liquid tank, and the outlet of the mother liquid tank is connected to the inlet of the pulping tank through a pipeline.

[0011] As an improved technical solution, the filter residue outlet of the first plate and frame filter press is connected to a calcium sulfate storage tank.

[0012] As an improved technical solution, the filtrate outlet of the second plate and frame filter press is connected to an intermediate tank through a pipeline, and the outlet of the intermediate tank is connected to the inlet of the pulping tank through a pipeline.

[0013] As a preferred technical solution, the dissolution tank is provided with a first pH sensor, the outlet of the acid tank is provided with a first automatic regulating valve, and the first pH sensor and the first automatic regulating valve are interlocked to a control system.

[0014] As a preferred technical solution, the regulating tank is provided with a second pH sensor, the outlet of the alkali solution tank is provided with a second automatic regulating valve, and the second pH sensor and the second automatic regulating valve are interlocked to a control system.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0016] The utility model discloses a device for producing magnesium ammonium phosphate compound fertilizer with potassium phytate hydrolysis waste residue as raw material, comprising a waste residue tank, the outlet of the waste residue tank is connected with a pulping tank, the inlet of the pulping tank is connected with a purified water tank through a pipeline, the outlet of the pulping tank is connected with a dissolving tank through a pipeline, the inlet of the dissolving tank is connected with an acid liquid tank through a pipeline, the outlet of the dissolving tank is connected with a first plate and frame filter press through a pipeline, the filtrate outlet of the first plate and frame filter press is connected with a temporary storage tank through a pipeline, the outlet of the temporary storage tank is connected with a regulating tank through a pipeline, the inlet of the regulating tank is connected with an alkali liquid tank through a pipeline, the outlet of the regulating tank is connected with a second plate and frame filter press through a pipeline, and the filter residue outlet of the second plate and frame filter press is connected with a crude magnesium ammonium phosphate tank. The potassium phytate hydrolysis waste residue is pulped by a pulping tank, and then transferred to a dissolving tank, where it is dissolved and acidified by adding acid solution, and the obtained acidified liquid is filtered by a first plate and frame filter press, wherein the filtrate enters a temporary storage tank, alkali solution is added to adjust the pH and react, and finally the obtained reaction liquid is filtered by a second plate and frame filter press to obtain a crude magnesium ammonium phosphate tank, thereby realizing the reuse of the potassium phytate hydrolysis residue, avoiding the waste of raw materials and the pollution to the environment caused by direct discharge, improving its economic benefits, and being environmentally friendly.

[0017] The outlet of the crude magnesium ammonium phosphate tank of the utility model is connected with a dryer, and the outlet of the dryer is connected with the finished magnesium ammonium phosphate tank. By drying the crude magnesium ammonium phosphate tank, the moisture in the product is further reduced, and the quality of the product is improved.

[0018] The outlet of the crude magnesium ammonium phosphate tank is connected to a centrifuge, the solid phase outlet of the centrifuge is connected to the dryer, and the outlet of the dryer is connected to the magnesium ammonium phosphate finished product tank. By centrifuging the magnesium ammonium phosphate finished product tank first and then drying it, the drying cycle is shortened and the water removal effect in the product is better.

[0019] The liquid phase outlet of the centrifuge is connected to a mother liquid tank, and the outlet of the mother liquid tank is connected to the inlet of the pulping tank through a pipeline. By recycling the centrifugal mother liquid, the waste of raw materials is avoided, the yield of the product is improved, and the economic effect of the process is improved.

[0020] The filter residue outlet of the first plate and frame filter press is connected to a calcium sulfate storage tank, so that the by-product calcium sulfate can be recovered and sold outside, thereby increasing the economic benefits of the product.

[0021] The filtrate outlet of the second plate-frame filter press is connected to an intermediate tank through a pipeline, and the outlet of the intermediate tank is connected to the inlet of the pulping tank through a pipeline. By recovering the filtrate of the second plate-frame filter press and returning it to the pulping tank, the waste of raw materials is avoided, the yield of the product is improved, and the economic effect of the process is improved.

[0022] The dissolving tank is provided with a first pH sensor, the outlet of the acid tank is provided with a first automatic regulating valve, and the first pH sensor and the first automatic regulating valve are interlocked to a control system. The control system adjusts the opening and closing and the opening degree of the first automatic regulating valve according to the value of the first pH sensor, so that the feeding is more accurate and the product quality is higher.

[0023] The regulating tank is provided with a second pH sensor, the outlet of the alkali liquid tank is provided with a second automatic regulating valve, and the second pH sensor and the second automatic regulating valve are interlocked to a control system. The control system adjusts the opening and closing and the opening degree of the second automatic regulating valve according to the value of the second pH sensor, so that the feeding is more accurate and the product quality is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Among them: 1. Waste residue tank; 2. Pulping tank; 3. Purified water tank; 4. Dissolving tank; 5. Acid tank; 6. First plate and frame filter press; 7. Temporary storage tank; 8. Adjustment tank; 9. Alkali liquid tank; 10. Second plate and frame filter press; 11. Magnesium ammonium phosphate crude product tank; 12. Dryer; 13. Magnesium ammonium phosphate finished product tank; 14. Centrifuge; 15. Mother liquor tank; 16. Calcium sulfate storage tank; 17. Intermediate tank; 18. First pH sensor; 19. First automatic regulating valve; 20. Second pH sensor; 21. Second automatic regulating valve. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] like Figure 1As shown, a device for producing magnesium ammonium phosphate compound fertilizer using potassium phytate hydrolysis waste residue as raw material comprises a waste residue tank 1, the outlet of the waste residue tank 1 is connected to a pulping tank 2, the inlet of the pulping tank 2 is connected to a purified water tank 3 through a pipeline, the outlet of the pulping tank 2 is connected to a dissolving tank 4 through a pipeline, the inlet of the dissolving tank 4 is connected to an acid liquid tank 5 through a pipeline, the outlet of the dissolving tank 4 is connected to a first plate and frame filter press 6 through a pipeline, the filtrate outlet of the first plate and frame filter press 6 is connected to a temporary storage tank 7 through a pipeline, the outlet of the temporary storage tank 7 is connected to a regulating tank 8 through a pipeline, the inlet of the regulating tank 8 is connected to an alkali liquid tank 9 through a pipeline, the outlet of the regulating tank 8 is connected to a second plate and frame filter press 10 through a pipeline, and the filtrate outlet of the second plate and frame filter press 10 is connected to a crude magnesium ammonium phosphate tank 11. The potassium phytate hydrolysis waste residue is pulped by a pulping tank 2, and then transferred to a dissolving tank 4, where it is dissolved and acidified by adding acid solution. The obtained acidified liquid is filtered by a first plate and frame filter press 6, wherein the filtrate enters a temporary storage tank 7, and an alkali solution is added to adjust the pH and react. Finally, the obtained reaction liquid is filtered by a second plate and frame filter press 10 to obtain a crude magnesium ammonium phosphate tank 11, thereby realizing the reuse of the potassium phytate hydrolysis residue, avoiding the waste of raw materials and the pollution to the environment caused by direct discharge, improving its economic benefits, and being environmentally friendly.

[0029] The outlet of the crude magnesium ammonium phosphate tank 11 is connected to a dryer 12, and the outlet of the dryer 12 is connected to a finished magnesium ammonium phosphate tank 13. By drying the crude magnesium ammonium phosphate tank 11, the moisture in the product is further reduced, and the quality of the product is improved.

[0030] The outlet of the crude magnesium ammonium phosphate tank 11 is connected to the centrifuge 14, the solid phase outlet of the centrifuge 14 is connected to the dryer 12, and the outlet of the dryer 12 is connected to the magnesium ammonium phosphate finished product tank 13. By first centrifuging the magnesium ammonium phosphate finished product tank 13 and then drying it, the drying cycle is shortened, and the water removal effect in the product is better.

[0031] The liquid phase outlet of the centrifuge 14 is connected to a mother liquid tank 15, and the outlet of the mother liquid tank 15 is connected to the inlet of the pulping tank 2 through a pipeline. By recycling the centrifuged mother liquid, the waste of raw materials is avoided, the yield of the product is improved, and the economic effect of the process is improved.

[0032] The filter residue outlet of the first plate-frame filter press 6 is connected to a calcium sulfate storage tank 16, so that by-product calcium sulfate can be recovered and sold, thereby increasing the economic benefits of the product.

[0033] The filtrate outlet of the second plate-frame filter press 10 is connected to the intermediate tank 17 through a pipeline, and the outlet of the intermediate tank 17 is connected to the inlet of the pulping tank 2 through a pipeline. By recovering the filtrate of the second plate-frame filter press 10 and returning it to the pulping tank 2, the waste of raw materials is avoided, the yield of the product is improved, and the economic effect of the process is improved.

[0034] The dissolving tank 4 is provided with a first pH sensor 18, and the outlet of the acid tank 5 is provided with a first automatic regulating valve 19, and the first pH sensor 18 and the first automatic regulating valve 19 are interlocked to a control system. The control system adjusts the opening and closing and the opening degree of the first automatic regulating valve 19 according to the value of the first pH sensor 18, so that the feeding is more accurate and the quality of the product is higher.

[0035] The regulating tank 8 is provided with a second pH sensor 20, and the outlet of the alkali liquid tank 9 is provided with a second automatic regulating valve 21, and the second pH sensor 20 and the second automatic regulating valve 21 are interlocked to the control system. The control system adjusts the opening and closing and the opening degree of the second automatic regulating valve 21 according to the value of the second pH sensor 20, so that the feeding is more accurate and the quality of the product is higher.

[0036] The working principle of this utility model:

[0037] (1) Beating: After flash evaporation, the potassium phytate hydrolysis residue that has passed through the plate frame is added with 1-3 times the volume of purified water and beaten in a beating tank 2 to obtain a beating liquid.

[0038] (2) Dissolution: In the dissolving tank 4, the pH value of the pulping liquid is adjusted to 1-3 with 5-30wt% phosphoric acid, 5-30wt% nitric acid or 1-40wt% sulfuric acid, and the pulping liquid is fully stirred and dissolved to obtain a dissolved liquid.

[0039] (3) Filtration: The dissolved liquid is filtered through the first plate-frame filter press 6 (pressure -0.04 to -0.1 MPa) to obtain a filtrate and a filter residue. The main component of the filter residue is calcium sulfate, which is recovered and taken out.

[0040] (4) pH adjustment: In the adjustment tank 8, the filtrate from the first plate and frame filter press 6 is adjusted to pH 6-6.5 with 5-40 wt% NaOH, 10-30 wt% KOH or concentrated aqueous ammonia, and reacted at 40-60° C. for 30-120 min to obtain a reaction solution.

[0041] (5) Filtration: The reaction solution is filtered using a second plate-frame filter press 10 (pressure -0.04 to -0.1 MPa) to obtain a crude magnesium ammonium phosphate product and a filtrate, wherein the filtrate is returned to the pulping tank 2.

[0042] (6) Centrifugation: The crude magnesium ammonium phosphate enters the centrifuge 14 for dehydration, and the centrifuged mother liquor enters the pulping tank 2 for reuse.

[0043] (7) Drying: Dry the magnesium ammonium phosphate crystals after centrifugation at 85-95° C. in a dryer 12 to obtain a magnesium ammonium phosphate compound fertilizer product.

[0044] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A device for producing magnesium ammonium phosphate composite fertilizer using potassium phytate hydrolysis waste residue as raw material, characterized in that: It includes a waste residue tank, the outlet of the waste residue tank is connected to a pulping tank, the inlet of the pulping tank is connected to a purified water tank through a pipeline, the outlet of the pulping tank is connected to a dissolution tank through a pipeline, the inlet of the dissolution tank is connected to an acid tank through a pipeline, the outlet of the dissolution tank is connected to a first plate and frame filter press through a pipeline, the filtrate outlet of the first plate and frame filter press is connected to a temporary storage tank through a pipeline, the outlet of the temporary storage tank is connected to a regulating tank through a pipeline, the inlet of the regulating tank is connected to an alkali liquid tank through a pipeline, the outlet of the regulating tank is connected to a second plate and frame filter press through a pipeline, and the residue outlet of the second plate and frame filter press is connected to a crude magnesium ammonium phosphate tank.

2. A device for producing magnesium ammonium phosphate composite fertilizer using potassium phytate hydrolysis waste residue as raw material as claimed in claim 1, characterized in that: The outlet of the crude magnesium ammonium phosphate tank is connected to a dryer, and the outlet of the dryer is connected to a finished magnesium ammonium phosphate tank.

3. A device for producing magnesium ammonium phosphate composite fertilizer using potassium phytate hydrolysis waste residue as raw material as claimed in claim 2, characterized in that: The outlet of the crude magnesium ammonium phosphate tank is connected to a centrifuge, the solid phase outlet of the centrifuge is connected to the dryer, and the outlet of the dryer is connected to a finished magnesium ammonium phosphate tank.

4. A device for producing magnesium ammonium phosphate composite fertilizer using potassium phytate hydrolysis waste residue as raw material as claimed in claim 3, characterized in that: The liquid phase outlet of the centrifuge is connected to a mother liquid tank, and the outlet of the mother liquid tank is connected to the inlet of the pulping tank through a pipeline.

5. A device for producing magnesium ammonium phosphate composite fertilizer using potassium phytate hydrolysis waste residue as raw material as claimed in claim 1, characterized in that: The filter residue outlet of the first plate-frame filter press is connected to a calcium sulfate storage tank.

6. A device for producing magnesium ammonium phosphate composite fertilizer using potassium phytate hydrolysis waste residue as raw material as claimed in claim 1, characterized in that: The filtrate outlet of the second plate-frame filter press is connected to an intermediate tank via a pipeline, and the outlet of the intermediate tank is connected to the inlet of the pulping tank via a pipeline.

7. A device for producing magnesium ammonium phosphate composite fertilizer using potassium phytate hydrolysis waste residue as raw material as claimed in claim 1, characterized in that: The dissolving tank is provided with a first pH sensor, the outlet of the acid tank is provided with a first automatic regulating valve, and the first pH sensor and the first automatic regulating valve are interlocked to a control system.

8. A device for producing magnesium ammonium phosphate composite fertilizer using potassium phytate hydrolysis waste residue as raw material as claimed in claim 1, characterized in that: The regulating tank is provided with a second pH sensor, the outlet of the alkali solution tank is provided with a second automatic regulating valve, and the second pH sensor and the second automatic regulating valve are interlocked to a control system.

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