Waste salt resource utilization device and use method thereof

Abstract

The present invention relates to a waste salt resource utilization device and a use method thereof. The waste salt resource utilization device comprises a pretreatment device for drying and crushing waste salt and a fermentation tank, wherein the solid phase outlet of the pretreatment device for drying and crushing waste salt is connected to the waste salt inlet of the fermentation tank; the resource utilization device of the present invention dries and crushes the waste salt through the pretreatment device so that the waste salt meets the requirements of biological fermentation, and then mixes the dried and crushed waste salt with biological auxiliary materials in the fermentation tank for fermentation to obtain raw materials for organic fertilizer, thereby realizing the resource utilization of waste salt and turning waste into treasure, and the waste salt has broad application prospects.

Description

Technical Field

[0001] The invention belongs to the field of waste salt resource recovery and relates to a waste salt resource utilization device and a use method thereof. Background Art

[0002] Industrial waste salt mainly comes from coal chemical industry, pesticide, fertilizer, biochemical industry and other industries. These industrial waste salts often contain a certain amount of organic matter and cannot be reused in industrial production. The relevant national legal documents also classify these waste salts as hazardous wastes. Waste salts are often complex in composition and highly toxic and harmful. They are difficult to treat in the hazardous waste industry, and the treatment cost is extremely high, which often brings a great burden to enterprises and also causes waste of resources.

[0003] CN110201975A discloses a waste salt resource treatment and disposal system, the system comprises a waste salt carbonization pyrolysis system, a carbon-containing salt slag dissolution and filtration system and an evaporation salt separation system which are sequentially connected, the waste salt carbonization pyrolysis system can perform carbonization pyrolysis treatment on waste salt I composed of sodium chloride, sodium sulfate monomer salt or mixed waste salt, and can treat tail gas and discharge it in compliance with standards; the carbon-containing salt slag dissolution and filtration system can dissolve and filter the carbon-containing salt slag treated by the waste salt carbonization pyrolysis system; the evaporation salt separation system can perform evaporation concentration, step-by-step crystallization and drying treatment on the concentrated brine treated by the carbon-containing salt slag dissolution and filtration system to obtain product salt; CN105585194 A discloses a Na-containing + ,Ka + NH 4+ , Cl - 、SO4 2- 、NO 3- A comprehensive utilization method for high-concentration waste brine in coal chemical industry. After the high-concentration waste brine is softened and impurities are removed, and COD is removed by coagulation and precipitation, the water is concentrated by 20-30% through an air cooler; it then enters the secondary and tertiary concentration systems and mixed salt recovery system, and adopts a multi-effect negative pressure evaporation method to concentrate and separate sodium sulfate, sodium chloride and sodium nitrate, potassium sulfate mixed salt; the condensed water is reused; the purity of the separated sodium chloride and sodium sulfate is as high as 99% or more; the above scheme has the problems of complex process flow, more equipment used, and high industrialization cost.

[0004] Therefore, it is still of great significance to develop a waste salt resource utilization device and a method of using the device with low industrial cost, complete resource utilization and high product added value. Summary of the invention

[0005] The object of the present invention is to provide a waste salt resource utilization device and a use method thereof, wherein the waste salt resource utilization device comprises a pretreatment device for drying and crushing waste salt and a fermentation tank, wherein the solid phase outlet of the pretreatment device for drying and crushing waste salt is connected to the waste salt inlet of the fermentation tank; the resource utilization device of the present invention dries and crushes the waste salt through the pretreatment device for drying and crushing waste salt so that it meets the requirements of biological fermentation, and then mixes the dried and crushed waste salt with biological auxiliary materials in the fermentation tank for fermentation to obtain the raw material of organic fertilizer, thereby realizing the resource utilization of waste salt and turning waste into treasure, and has broad application prospects.

[0006] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a waste salt resource utilization device, which includes a pretreatment device for drying and crushing waste salt and a fermentation tank; wherein the solid phase outlet of the pretreatment device for drying and crushing waste salt is connected to the waste salt inlet of the fermentation tank.

[0008] The pretreatment device for drying and crushing waste salt in the waste salt resource utilization device of the present invention dries and crushes waste salt with high moisture content (moisture content <45wt%) and large particle size to obtain waste salt powder with a moisture content of 10-15wt%, such as 11wt%, 12wt%, 13wt% or 14wt%, and a particle size of <60 mesh, such as 80 mesh, 100 mesh, 150 mesh, 200 mesh or 250 mesh, etc., and then places the waste salt powder in a fermentation tank, mixes it with biological auxiliary materials and ferments it to obtain the raw material of organic fertilizer.

[0009] The biological auxiliary materials mentioned here refer to engineered bacteria, including nitrifying bacteria, efficient denitrifying bacteria, phosphorus removal bacteria, etc. The amount of engineered bacteria added is 10-60% of the weight of the waste salt, such as 20%, 30%, 40% or 50%.

[0010] Preferably, the pretreatment device for drying and crushing waste salt comprises an induced draft fan, a heater, a feeder, a crusher and a gas-solid separation device which are sequentially connected, and the solid phase outlet of the gas-solid separation device is connected to the waste salt inlet of the fermentation tank.

[0011] The pretreatment device for drying and crushing waste salt in the present invention includes an induced draft fan arranged in sequence, wherein the induced draft fan is used to generate an air flow, and then the air flow is heated by a heater to obtain an air flow with a temperature of 60-450°C, such as 80°C, 100°C, 150°C, 200°C, 250°C, 300°C, 350°C or 400°C, etc. The heated air flow flows through a feeder, and the waste salt material enters the air flow driven by the air flow to achieve the purpose of drying. Then, the waste salt material flows through a crusher to be crushed to a desired particle size, and is separated from the gas by a gas-solid separation device to obtain waste salt powder. At this time, the gas still has a relatively high temperature, and heat can be recovered subsequently through a waste gas treatment system.

[0012] Preferably, the heater is an electric heater; the installed capacity is 45-110 kW / automatic control. The speed of evaporating water from the waste salt is controlled to be 20-30 kg / h, such as 22 kg / h, 24 kg / h, 26 kg / h or 28 kg / h.

[0013] Preferably, the feeder is selected from a shaftless screw feeder with an anti-bridging breaking device and a matching hopper.

[0014] The pulverizer described herein may use a stirring blade and control the main shaft speed to be 0-416 rpm, for example, 50 rpm, 100 rpm, 150 rpm, 200 rpm, 250 rpm, 300 rpm, 350 rpm or 400 rpm.

[0015] Preferably, a preliminary filtering device is provided between the induced draft fan and the heater for filtering dust in the gas.

[0016] Before heating the airflow of the induced draft fan, the airflow is initially filtered to remove dust particles with a particle size of ≥5μm in the airflow, and the filtered air volume is controlled at 2000m 3 / h or above, achieving primary and secondary efficient air filtration.

[0017] Preferably, the gas-solid separation device comprises a cyclone separator and a pulse bag dust collector which are connected in sequence, and the inlet of the cyclone separator is connected to the outlet of the pulverizer.

[0018] Here, a cyclone separator and a pulse bag dust collector are connected in series. After the crushed waste salt powder is separated by a cyclone separator, the solid phase waste salt is collected. The gas phase still contains small particles of waste salt. The gas separated by the cyclone is processed by a pulse bag dust collector, and the solid phase material is recovered, thereby improving the utilization rate of the waste salt and avoiding secondary pollution.

[0019] The pulse bag dust collector here can be selected from MC66-1500, which is top-detachable and has a filtration area of ​​38m 2 , bag filter wind speed v<1.2m / min.

[0020] Preferably, the resource utilization device comprises a barrel, the solid phase outlet of the gas-solid separation device is connected to the inlet of the barrel, and the outlet of the barrel is connected to the waste salt inlet of the fermentation tank.

[0021] Preferably, a vacuum feeder is provided on the barrel for conveying the waste salt in the barrel to the fermentation tank.

[0022] Preferably, the barrel is equipped with an intelligent floor scale for monitoring the amount of waste salt in the barrel.

[0023] Preferably, the fermentation tank includes a tank body, which is provided with a waste salt inlet, a biological auxiliary material inlet, an exhaust port and a discharge port; the biological auxiliary material inlet is used to add biological auxiliary materials into the tank body, the exhaust port is used to discharge the gas generated in the waste salt biological fermentation process, and the discharge port is used to discharge the organic fertilizer raw materials generated by the waste salt fermentation.

[0024] The biological auxiliary material described herein comprises engineered bacteria for biological fermentation of waste salt.

[0025] Preferably, a heating jacket is provided outside the tank body, and the heating jacket is used to heat the tank body.

[0026] During the fermentation process in the fermenter, the fermentation temperature needs to be controlled at 30-100°C, such as 40°C, 50°C, 60°C, 70°C, 80°C or 90°C, etc. A heating jacket is provided here to facilitate the control of the heating temperature.

[0027] Preferably, a spraying device is also provided in the fermentation tank body for spraying water onto the mixture of waste salt and biological auxiliary material.

[0028] Preferably, a temperature sensor is provided on the tank body of the fermentation tank.

[0029] Preferably, a stirring paddle is provided at the bottom of the fermentation tank.

[0030] Preferably, the stirring paddle is a spiral stirring paddle.

[0031] Preferably, a variable frequency motor is provided on the fermentation tank, and the variable frequency motor is used to drive the stirring paddle to rotate.

[0032] Preferably, the tank body is also provided with steam holes, and the steam holes are used to inactivate bacteria in the product of biological fermentation of waste salt.

[0033] Preferably, the resource utilization device also includes a waste gas treatment system, which includes a container for storing liquid and a first gas inlet and a second gas inlet arranged on the container, the first gas inlet is connected to the gas outlet of the gas-solid separation device, and the second gas inlet is connected to the exhaust port of the fermentation tank.

[0034] The waste gas treatment system described in the present invention has two main functions. One is to use liquid as an absorbent to absorb the high-temperature waste gas (60-450°C) at the gas outlet of the gas-solid separation device to achieve waste heat recovery. The other is to heat up and degrade the pollutants in the waste gas, thereby achieving waste gas treatment and avoiding secondary pollution.

[0035] The gas produced by biological fermentation of waste salt in the present invention mainly contains ammonia and the like, which is introduced into a waste gas treatment system and treated by biodegradation, thereby effectively removing pollutants in the waste gas and avoiding secondary pollution.

[0036] Water is used as the liquid for waste heat recovery here, and the waste heat of the high-temperature exhaust gas can heat the water to 20-100°C, such as 30°C, 40°C, 50°C, 60°C, 70°C, 80°C or 90°C.

[0037] Preferably, the volume of the container storing the liquid in the exhaust gas treatment system is 1.5-10 tons, for example, 2 tons, 3 tons, 4 tons, 5 tons, 6 tons, 7 tons, 8 tons or 9 tons.

[0038] The liquid herein includes water.

[0039] Preferably, the container storing the liquid is equipped with an intelligent floor scale for monitoring the water injection amount of the fermentation tank spray head. The water injection amount is 20-70% according to the weight of the material, such as 30%, 40%, 50%, 60%, etc.

[0040] Preferably, an activated carbon adsorption device is provided between the gas outlet of the gas-solid separation device and the first gas inlet.

[0041] Preferably, the liquid outlet of the exhaust gas treatment system is connected to the liquid inlet of the fermenter.

[0042] The liquid outlet of the waste gas treatment system described here is connected to the liquid inlet of the fermentation tank, and then the liquid of the waste gas treatment system is sprayed into the fermentation tank through the spraying device in the fermentation tank for biological fermentation, avoiding the generation of wastewater and achieving zero emission in the production process.

[0043] Preferably, a water pump is provided in the waste gas treatment system, and the liquid outlet of the water pump is connected to the liquid inlet of the fermentation tank. During use, the water pump outputs the liquid of the waste gas treatment system to the fermentation tank, which is sprayed by the spraying device for biological fermentation.

[0044] In a second aspect, the present invention provides a method for using the resource utilization device as described in the first aspect, the method comprising: drying and crushing the waste salt in a pretreatment device for drying and crushing the waste salt, and then transporting it to a fermentation tank for mixed fermentation with biological auxiliary materials to obtain an organic fertilizer raw material.

[0045] The device of the present invention realizes resource utilization of waste salt by adopting the above-mentioned use method to obtain organic fertilizer raw materials.

[0046] The mixed fermentation time of the waste salt and biological auxiliary materials of the present invention is 10-12 days, such as 10.5 days, 11 days or 11.5 days.

[0047] Preferably, the use method comprises: starting an induced draft fan to generate an airflow, the airflow is heated by a heater, waste salt is then added through a feeder, the airflow drives the waste salt through a grinder to grind the waste salt, and then the waste salt powder is separated by a gas-solid separation device, the waste salt powder enters the tank body of the fermentation tank through the waste salt inlet of the fermentation tank, the biological auxiliary material enters the tank body of the fermentation tank through the biological auxiliary material inlet on the fermentation tank, the waste salt powder and the biological auxiliary material are mixed and fermented in the tank body of the fermentation tank to prepare an organic fertilizer raw material.

[0048] Preferably, during the mixing process of the waste salt powder and the biological auxiliary material, the spraying device in the fermentation tank sprays water into the mixture of the waste salt powder and the biological auxiliary material.

[0049] Preferably, the water sprayed by the spraying device comes from an external water source and / or a water outlet in the exhaust gas treatment system.

[0050] Preferably, the mixed fermentation product is sterilized by steam through the steam holes on the fermentation tank and then discharged from the discharge port of the fermentation tank to obtain an organic fertilizer raw material.

[0051] Preferably, the gas at the gas outlet of the gas-solid separation device enters the container storing the liquid through the first gas inlet of the exhaust gas treatment system, mixes with the liquid in the container, and recovers heat.

[0052] Preferably, the gas from the exhaust hole of the fermentation tank enters the container storing liquid through the second gas inlet of the waste gas treatment system, and biological bacteria are added to the liquid in the container to biodegrade organic pollutants in the waste gas.

[0053] Preferably, the liquid outlet of the waste gas treatment system is connected to a spraying device of a fermentation tank for spraying a mixture of waste salt and biological auxiliary materials.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The waste salt resource utilization device of the present invention comprises a pretreatment device for drying and crushing waste salt and a fermentation tank, wherein the solid phase outlet of the pretreatment device is connected to the waste salt inlet of the fermentation tank, and the waste salt is dried and crushed by the above device and then mixed with biological auxiliary materials in the fermentation tank for fermentation to obtain the raw material of organic fertilizer, thereby realizing the resource utilization of waste salt. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1It is a structural schematic diagram of the waste salt resource utilization device of the present invention;

[0057] Figure 2 It is a schematic diagram of the structure of the waste gas treatment system for waste salt resource utilization in the present invention;

[0058] Figure 3 It is a schematic diagram of the structure of a fermentation tank used for waste salt resource utilization in the present invention;

[0059] 1- induced draft fan, 2- electric heater, 3- feeder, 4- pulverizer, 5- cyclone separator, 6- pulse bag filter, 7- barrel, 8- fermentation tank, 9- waste gas treatment system, 80- tank body, 81- waste salt inlet, 82- biological auxiliary material inlet, 83- discharge port, 84- exhaust port, 85- steam port, 86- spiral stirring paddle, 87- heating jacket, 88- temperature sensor, 89- spraying device, 90- container for storing liquid, 91- first gas inlet, 92- second gas inlet, 93- liquid outlet, 94- water pump. DETAILED DESCRIPTION

[0060] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Example

[0061] The schematic diagram of the waste salt resource utilization device in this embodiment is as follows: Figure 1 As shown, the resource utilization device includes a pretreatment device and a fermentation tank for drying and crushing waste salt, and the pretreatment device includes an induced draft fan 1, an electric heater 2, a feeder 3, a crusher 4, a cyclone separator 5, and a pulse bag dust collector 6 connected in sequence;

[0062] The waste salt resource utilization device also includes a barrel 7, the solid outlet of the cyclone separator 5 is connected to the inlet of the barrel 7, and the solid outlet of the pulse bag dust collector 6 is connected to the inlet of the barrel 7; the barrel 7 is used to store the dried and crushed waste salt; the discharge port of the barrel 7 is connected to the waste salt inlet on the tank body of the fermentation tank 8, so as to supply the fermentation tank and ensure the stable fermentation process;

[0063] The waste salt resource utilization device also includes a waste gas treatment system 9, the structural diagram of the waste gas treatment system is as follows: Figure 2As shown, the waste gas treatment system 9 includes a container 90 for storing liquid, and a first gas inlet 91 and a second gas inlet 92 are provided on the container. The first gas inlet 91 is connected to the gas outlet of the pulse bag dust collector 6. The waste gas after dust removal by the pulse bag dust collector 6 still maintains a high temperature, and is mixed with the liquid in the container of the waste gas treatment system to recover waste heat; the second gas inlet 92 is connected to the exhaust port of the fermentation tank 8, and biological bacteria are added to the liquid in the container of the waste gas treatment system. The organic matter in the waste gas entering the waste gas treatment system through the exhaust port of the fermentation tank can be degraded, thereby realizing waste gas treatment; a liquid outlet 93 is provided on the container for storing liquid, and a water pump 94 is provided in the waste gas treatment system. The water pump 94 is used to transport the liquid in the waste gas treatment system to the fermentation tank 8, and is used for biological fermentation of waste salt after spraying by a spraying device.

[0064] The structural schematic diagram of the fermentation tank of the present invention is as follows Figure 3 As shown, the fermentation tank includes a tank body 80, on which a waste salt inlet 81, a biological auxiliary material inlet 82, a discharge port 83, an exhaust port 84 and a steam port 85 are provided; a spiral stirring paddle 86 is provided at the bottom of the tank body of the fermentation tank, and the fermentation tank also includes a variable frequency motor, which drives the spiral stirring paddle to rotate to achieve material mixing, and a heating jacket 87 is coated on the tank body of the fermentation tank, and a temperature sensor 88 is provided on the tank body. A spray device 89 is provided on the top of the tank body, and the spray device is used to spray liquid into the mixture of waste salt and biological auxiliary material for waste salt biological fermentation and avoid waste salt agglomeration. The water used for spraying here comes from an external water source and / or waste water from a waste gas treatment system. In the present invention, waste water in the waste gas treatment system is sprayed into the fermentation tank for waste salt biological fermentation, thereby avoiding waste water generation and achieving zero emission in the production process.

[0065] The method for using the resource utilization device described in this embodiment includes: an induced draft fan introduces an air flow, and the air flow is heated by an electric heater. The heated air flow flows through a feeder to add waste salt. At this time, the heated air flow contacts the waste salt to achieve drying of the waste salt. The air flow carrying the waste salt flows through a grinder to be crushed to obtain waste salt powder with a specific moisture content and particle size. After the air flow carrying the waste salt powder is dusted by a cyclone separator and a pulse bag dust collector, the solid phase enters the material barrel, and the gas phase enters the exhaust gas treatment system through a first gas inlet, mixes with the liquid in the exhaust gas treatment system, heats the liquid, and recovers waste heat at the same time; the waste salt powder in the material barrel enters the fermentation tank through a vacuum feeder and a waste salt inlet of the fermentation tank, and the biological auxiliary material enters the fermentation tank through a biological auxiliary material inlet of the fermentation tank, and the biological auxiliary material and the waste salt powder are mixed under the stirring of a spiral stirring paddle; at the same time, the spray device sprays water into the biological auxiliary material and the waste salt powder to achieve biological fermentation; after the fermentation is completed, the fermentation product is steam sterilized through the steam port and discharged from the discharge port of the fermentation tank to obtain the raw material of organic fertilizer.

[0066] The following application examples use the resource utilization device described in Example 1;

[0067] Application Example 1

[0068] The waste salt used in this application example comes from Suzhou Tianma Pharmaceutical Co., Ltd. The pharmaceutical waste salt includes 6 kinds of waste salts: sodium sulfate from the A amine filtration section, sodium chloride from the evaporation and desalination of the A ester salt-containing wastewater, sodium sulfate from the evaporation and desalination of the TA salt methyl ester section, potassium dihydrogen phosphate from the concentrated desalination of the wastewater from the stratified extraction of the hydrogen sulfate, chlorine, arsenic and gray comprehensive section, calcium carbonate from the filtration of the sodium citicoline synthesis section, and sodium bromide concentrated in the rebamipide RBD3 section.

[0069] Biological auxiliary materials use specially cultured nitrifying bacteria, highly efficient denitrifying bacteria and phosphorus removal bacteria;

[0070] The waste salt mixture (water content 45%) is dried and crushed by the pretreatment device described in Example 1 of the present invention, and its particle size is controlled to be less than 60 mesh, the water content is 13%, and the amount of biological auxiliary material added is 20% of the mass of the waste salt; the fermentation temperature is 70°C, the waste salt fermentation time is 11 days, and the waste salt fermentation process adopts a spiral stirring paddle to stir and mix, and at the same time, wastewater from the waste gas treatment system is sprayed through a spray device; the liquid spraying amount is 55% of the mass of the waste salt powder in the fermentation tank, and the fermentation product is discharged from the discharge port of the fermentation tank after steam sterilization;

[0071] The operating parameters of each device in the pretreatment device for drying and crushing waste salt are as follows:

[0072] Induced draft fan: ≦120℃, electric heater: ≧150℃, charge: ≧100KG, crusher: 200 mesh, cyclone separator: §500*2MM, pulse bag dust collector: ≧1000 mesh.

[0073] The above parameters are adopted in each part of the pretreatment device for drying and crushing waste salt, and the particle size and water content of the waste salt powder obtained meet the above conditions.

[0074] In this application example, the product at the discharge port of the fermentation tank was tested and identified by Jiangsu Product Quality Research Institute. According to the organic fertilizer standard (NY-525-2012), it met the requirements for organic fertilizer raw materials.

[0075] This application example uses the resource utilization device described in Example 1 to perform biological fermentation treatment on medical waste salt containing 6 types of waste salt from Suzhou Tianma Pharmaceutical Co., Ltd., and the fermentation products are tested and identified by Jiangsu Product Quality Research Institute and all meet the standards for organic fertilizer raw materials.

[0076] Application Example 2

[0077] The waste salt used in this application example comes from sodium acetate produced by omeprazole extraction, evaporation and chlorination processes of Jiangsu Binhai Jinhaili Pharmaceutical Chemical Co., Ltd.; the three-effect evaporation waste salt with code 900-000-49 of Jiangsu Fengshan Group Co., Ltd.; a total of 7 types of waste salt;

[0078] Biological auxiliary materials use specially cultured nitrifying bacteria, highly efficient denitrifying bacteria and phosphorus removal bacteria;

[0079] The waste salt mixture (water content 35%) is dried and crushed by the pretreatment device described in Example 1 of the present invention, and its particle size is controlled to be less than 60 mesh, the water content is 14%, and the amount of biological auxiliary material added is 30% of the mass of the waste salt; the fermentation temperature is 50°C, the waste salt fermentation time is 10 days, and the waste salt fermentation process adopts a spiral stirring paddle to stir and mix, and at the same time, water is sprayed through a spray device; the liquid spraying amount is 55% of the mass of the waste salt powder in the fermentation tank, and the fermentation product is discharged from the discharge port of the fermentation tank after steam sterilization;

[0080] The operating parameters of each device in the pretreatment device for drying and crushing waste salt are as follows:

[0081] Induced draft fan: ≦120℃, electric heater: ≧150℃, charge: ≧100KG, crusher: 200 mesh, cyclone separator: §500*2MM, pulse bag dust collector: ≧1000 mesh.

[0082] The above parameters are adopted in each part of the pretreatment device for drying and crushing waste salt, and the particle size and water content of the waste salt powder obtained meet the above conditions.

[0083] In this application example, the product at the discharge port of the fermentation tank was tested and identified by Jiangsu Product Quality Research Institute. According to the organic fertilizer standard (NY-525-2012), it met the requirements for organic fertilizer raw materials.

[0084] Application Example 3

[0085] The waste salt used in this application example comes from the waste salt produced by the three-effect evaporation of each workshop of Jiangsu Huifeng Bio-Agriculture Co., Ltd.; the condensation reaction in CDD of Suqian Wanhetai Chemical Co., Ltd. generates water-soluble condensation products such as sodium chloride and sodium sulfate, a total of 3 types of waste salt;

[0086] Biological auxiliary materials use specific cultured nitrifying bacteria, efficient denitrifying bacteria and phosphorus removal bacteria, etc.

[0087] The waste salt mixture (water content 30%) is dried and crushed by the pretreatment device described in Example 1 of the present invention, and its particle size is controlled to be less than 60 mesh, the water content is 14%, and the amount of biological auxiliary material added is 35% of the mass of the waste salt; the fermentation temperature is 65°C, the waste salt fermentation time is 10 days, and the waste salt fermentation process adopts a spiral stirring paddle to stir and mix, and at the same time, water is sprayed through a spray device; the liquid spraying amount is 55% of the mass of the waste salt powder in the fermentation tank, and the fermentation product is discharged from the discharge port of the fermentation tank after steam sterilization;

[0088] The operating parameters of each device in the pretreatment device for drying and crushing waste salt are as follows:

[0089] Induced draft fan: ≦120℃, electric heater: ≧150℃, charge: 100KG, crusher: 200 mesh, cyclone separator: §500*2MM, pulse bag dust collector: ≧1000 mesh.

[0090] The above parameters are adopted in each part of the pretreatment device for drying and crushing waste salt, and the particle size and water content of the waste salt powder obtained meet the above conditions.

[0091] In this application example, the product at the discharge port of the fermentation tank was tested and identified by Jiangsu Product Quality Research Institute. According to the organic fertilizer standard (NY-525-2012), it met the requirements for organic fertilizer raw materials.

[0092] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A waste salt resource utilization device, characterized in that: The resource utilization device comprises a pretreatment device for drying and crushing waste salt and a fermentation tank; wherein the solid phase outlet of the pretreatment device for drying and crushing waste salt is connected to the waste salt inlet of the fermentation tank; The pretreatment device for drying and crushing waste salt comprises an induced draft fan, a heater, a feeder, a crusher, and a gas-solid separation device which are sequentially connected, and the solid phase outlet of the gas-solid separation device is connected to the waste salt inlet of the fermentation tank; A preliminary filtering device is provided between the induced draft fan and the heater to filter dust in the gas; The gas-solid separation device comprises a cyclone separator and a pulse bag dust collector connected in sequence, and the inlet of the cyclone separator is connected to the outlet of the pulverizer; The resource utilization device comprises a material barrel, the solid phase outlet of the gas-solid separation device is connected to the inlet of the material barrel, and the outlet of the material barrel is connected to the waste salt inlet of the fermentation tank; The fermentation tank comprises a tank body, on which a waste salt inlet, a biological auxiliary material inlet, an exhaust port and a discharge port are arranged; the biological auxiliary material inlet is used to add biological auxiliary materials into the tank body, the exhaust port is used to discharge the gas generated in the waste salt biological fermentation process, and the discharge port is used to discharge the organic fertilizer raw materials generated by the waste salt fermentation; The fermentation tank is also provided with a spraying device for spraying water onto the mixture of waste salt and biological auxiliary materials; A heating jacket is provided outside the tank body, and the heating jacket is used to heat the tank body; A stirring paddle is provided at the bottom of the fermentation tank; The stirring paddle is a spiral stirring paddle.

2. The resource utilization device according to claim 1, characterized in that: The tank body is also provided with steam holes, which are used to inactivate bacteria in the product of biological fermentation of waste salt.

3. The resource utilization device according to claim 1, characterized in that: The resource utilization device also includes a waste gas treatment system, which includes a container storing a liquid and a first gas inlet and a second gas inlet arranged on the container, wherein the first gas inlet is connected to the gas outlet of the gas-solid separation device, and the second gas inlet is connected to the exhaust port of the fermentation tank; An activated carbon adsorption device is arranged between the gas outlet of the gas-solid separation device and the first gas inlet.

4. The resource utilization device according to claim 3, characterized in that: The liquid outlet of the exhaust gas treatment system is connected to the liquid inlet of the fermentation tank.

5. The method for using the resource utilization device according to any one of claims 1 to 4, characterized in that: The use method comprises: drying and crushing the waste salt in a pretreatment device for drying and crushing the waste salt, and then conveying the waste salt to a fermentation tank for mixing with biological auxiliary materials for fermentation to obtain an organic fertilizer raw material.

6. The method of use according to claim 5, characterized in that: The method of use further comprises: starting an induced draft fan to generate an airflow, the airflow is heated by a heater, waste salt is then added through a feeder, the airflow drives the waste salt to pass through a pulverizer to pulverize the waste salt, and then the waste salt powder is separated by a gas-solid separation device, the waste salt powder enters the tank body of the fermentation tank through a waste salt inlet of the fermentation tank, the biological auxiliary material enters the tank body of the fermentation tank through a biological auxiliary material inlet on the fermentation tank, the waste salt powder and the biological auxiliary material are mixed and fermented in the fermentation tank to prepare an organic fertilizer raw material; During the mixing process of the waste salt powder and the biological auxiliary material, the spraying device in the fermentation tank sprays water into the mixture of the waste salt powder and the biological auxiliary material; The water sprayed by the spraying device comes from an external water source and / or a water outlet in the exhaust gas treatment system; The mixed fermentation product is sterilized by steam through the steam hole on the fermentation tank and then discharged from the discharge port of the fermentation tank to obtain organic fertilizer raw materials; The gas from the gas outlet of the gas-solid separation device enters the container storing the liquid through the first gas inlet of the exhaust gas treatment system, mixes with the liquid in the container, and recovers heat; The gas from the exhaust hole of the fermentation tank enters the container storing liquid through the second gas inlet of the waste gas treatment system, and biological bacteria are added to the liquid in the container to biodegrade the organic pollutants in the waste gas; The liquid outlet of the waste gas treatment system is connected to the spraying device of the fermentation tank, and the waste liquid of the waste gas treatment system is used to spray the mixture of waste salt and biological auxiliary materials.

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