Integrated device for modifying surface of silver powder by airflow method

Abstract

The utility model provides an airflow method silver powder surface modification treatment integrated device, relates to the technical field of powder surface modification treatment, and achieves the technical effect of integrating a series of functions of silver powder drying, crushing, coating modification and grading. The device consists of a nitrogen generator, a nitrogen heater, a silver powder washing kettle, a pneumatic dryer, a grading cyclone, a crushing modification module, a gas filter, a negative pressure induced draft fan, a condensation collection module, a circulating air heater and a pressure regulating valve. According to the silver powder preparation post-treatment device, centralized, rapid and efficient silver powder preparation post-treatment process operation is achieved, the occupied scale and personnel investment are reduced, meanwhile, the risk of precious metal loss in the silver powder preparation process is reduced through one-stop service, refined preparation and collection of required products, screening of superfine silver powder and recovery of ethanol agents in the preparation process are achieved, and the production cost is reduced. And the dosage of the coating agent is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of powder surface modification treatment, in particular to an integrated device for silver powder surface modification treatment using an airflow method. Background Art

[0002] Silver powder synthesis utilizes a chemical reduction method, where a silver salt and a reducing agent are added dropwise to a base solution at a uniform rate while stirring the solution. The reaction temperature is controlled throughout the reaction. Once the reaction is complete, the silver powder slurry is discharged into a container for solid-liquid separation by sedimentation. Silver powder surface treatment is typically performed in the liquid phase, where a mixture of silver powder, solvent, and active agent is prepared in a specific ratio. This mixture is then placed in a container and treated with a homogenizer. After centrifugal mixing and ultrasonic treatment, it is dried and crushed to yield the final silver powder product.

[0003] At present, the consumption of modified reagents in liquid phase coating method is large and cannot be recycled. At the same time, the drying equipment, crushing equipment and grading and screening equipment used in the surface treatment of silver powder are all used independently, with low mutual connection, unchanged operation and serious silver powder transfer loss. In order to facilitate the simple and smooth production process, improve the powder recovery rate and recycle related reagents, it is now necessary to develop a device to achieve one-stop completion of silver powder surface treatment.

[0004] In view of this, it is necessary to design an improved integrated device for surface modification of silver powder by airflow method to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide an integrated device for surface modification of silver powder by airflow method, which realizes the technical effect of integrating a series of functions of silver powder drying, crushing, coating modification and grading.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model provides an integrated device for surface modification of silver powder by air flow method, which includes a nitrogen generator, a nitrogen heater, a silver powder washing kettle, an air flow dryer, a classifying cyclone, a crushing and modification module, and a negative pressure induced draft fan;

[0007] The nitrogen generator and the nitrogen heater are connected to form a high-temperature gas passage, and are connected in parallel with the silver powder washing kettle through a pipeline, and are respectively connected to the air flow dryer;

[0008] The gas outlet pipe of the nitrogen generator is connected to the crushing and modification module;

[0009] The top feed port and bottom discharge port of the grading cyclone are respectively connected to the air flow dryer and the crushing and modification module pipeline;

[0010] The air outlet of the negative pressure induced draft fan is connected to the gas pipeline of the air flow dryer.

[0011] As a further improvement of the present invention, the top of the air flow dryer is provided with an atomizing nozzle, the side is provided with a circulating air return port, the bottom is provided with an air material discharge port and a temperature detection sensor; the air material discharge port is connected to the top feed port pipe of the grading cyclone.

[0012] As a further improvement of the present invention, the integrated device for surface modification of silver powder by airflow method also includes a gas filter; a circulating air inlet is provided on the side of the gas filter and a circulating air outlet is provided on the top; the circulating air inlet is connected to the grading cyclone pipeline; the circulating air outlet is connected to the air inlet pipeline of the negative pressure induced draft fan.

[0013] As a further improvement of the present invention, an ultrafine silver powder collection tank is provided at the bottom of the gas filter and a back-blowing gas distributor is provided at the top; the back-blowing gas distributor is connected to the gas outlet pipe of the nitrogen generator.

[0014] As a further improvement of the present invention, the integrated device for surface modification of silver powder by airflow method also includes a condensation collection module arranged between the air outlet of the negative pressure draft fan and the connecting pipe of the airflow dryer; the condensation collection module includes a condensation heat exchanger main body, an ethanol recovery storage tank arranged at the bottom of the condensation heat exchanger main body, and a chiller.

[0015] As a further improvement of the present invention, the integrated device for surface modification of silver powder by airflow method also includes a circulating air heater arranged between the air outlet of the negative pressure draft fan and the connecting pipe of the airflow dryer; the two ends of the circulating air heater are respectively connected to the circulating air return port and the condensation collection module pipe of the airflow dryer.

[0016] As a further improvement of the present invention, a pressure regulating valve is provided on the communication pipe between the circulating air heater and the condensation collection module.

[0017] As a further improvement of the present invention, the grading cyclone includes a first-stage grading cyclone, a second-stage grading cyclone, and a third-stage grading cyclone connected in sequence;

[0018] A product collecting tank is provided at the bottom of the three-stage grading cyclone.

[0019] As a further improvement of the present invention, the crushing and modifying module includes a primary airflow mill connected to the bottom of the primary classification cyclone, a secondary coating modifier connected to the bottom of the secondary classification cyclone, and a coating agent preparation kettle;

[0020] A reagent metering pump is provided on the communicating pipe between the coating reagent preparation kettle and the bottom of the secondary coating modifier.

[0021] As a further improvement of the present invention, high-speed airflow nozzles are provided at the bottom of the first-stage airflow mill and the second-stage coating modifier; the high-speed airflow nozzles are connected to the air outlet pipe of the nitrogen generator.

[0022] The beneficial effects of the utility model are:

[0023] 1. The integrated device for surface modification of silver powder by airflow method provided by the utility model adopts high-speed airflow as the power source, and the integrated structural design integrates the functions of drying, crushing and deagglomeration, coating modification and powder classification, thereby realizing the centralized, rapid and efficient operation of the post-processing process of silver powder preparation, reducing the land occupation scale and personnel input. At the same time, the one-stop service reduces the risk of precious metal loss in the silver powder preparation process, realizes the refined preparation and collection of required products, the screening of ultrafine silver powder, and the recovery of ethanol reagents in the preparation process, thereby reducing the dosage of coating reagents.

[0024] 2. The integrated device for surface modification of silver powder by airflow method provided by the utility model utilizes the integrated structural design of nitrogen generator, gas filter, negative pressure induced draft fan, condensation collection module and circulating air heater to realize the recycling of gas in the device system and the efficient physical recovery of reagents. It is green and environmentally friendly as a whole and has application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of the integrated device for surface modification of silver powder using an airflow method provided by the present invention.

[0026] Reference numerals

[0027] 1. Nitrogen generator; 2. Nitrogen heater; 3. Silver powder washing kettle; 4. Air flow dryer; 5. Classifying cyclone; 6. Crushing and modification module; 7. Gas filter; 8. Negative pressure induced draft fan; 9. Condensate collection module; 10. Circulating air heater; 11. Pressure regulating valve;

[0028] 31. Silver powder metering pump;

[0029] 41. Atomizing nozzle; 42. Circulating air return port; 43. Air and material discharge port; 44. Temperature detection sensor;

[0030] 51. First-stage grading cyclone; 52. Second-stage grading cyclone; 53. Third-stage grading cyclone; 531. Product collection tank;

[0031] 61. First-stage air jet mill; 62. Second-stage coating modifier; 63. Coating agent preparation kettle; 64. Agent metering pump; 65. High-speed air flow nozzle;

[0032] 71. Ultrafine silver powder collection tank; 72. Circulating air inlet; 73. Backflush gas distributor; 74. Circulating air outlet;

[0033] 91. Condensing heat exchanger body; 92. Ethanol recovery tank; 93. Chiller. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0036] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0037] See also Figure 1 As shown, the utility model provides an integrated device for surface modification treatment of silver powder by air flow method, which consists of a nitrogen generator 1, a nitrogen heater 2, a silver powder washing kettle 3, an air flow dryer 4, a classifying cyclone 5, a crushing modification module 6, a gas filter 7, a negative pressure induced draft fan 8, a condensation collection module 9, a circulating air heater 10 and a pressure regulating valve 11.

[0038] The nitrogen generator 1 and the nitrogen heater 2 are connected to form a high-temperature gas passage, and are connected in parallel with the silver powder washing kettle 3 through a pipeline, and are respectively connected to the atomizing nozzle 41 of the air flow dryer 4;

[0039] The outlet pipe of the nitrogen generator 1 is connected to the crushing and modification module 6;

[0040] The top feed port and bottom discharge port of the grading cyclone 5 are respectively connected to the air flow dryer 4 and the crushing and modification module 6 through pipelines;

[0041] The air outlet of the negative pressure induced draft fan 8 is connected to the gas pipeline of the air flow dryer 4, and a condensation collection module 9 and a circulating air heater 10 are also provided between the connecting pipelines of the two.

[0042] In some embodiments, the discharge port of the silver powder washing kettle 3 is equipped with a silver powder metering pump 31 .

[0043] The air flow dryer 4 is provided with an atomizing nozzle 41 at the top, a circulating air return port 42 at the side, and an air material discharge port 43 and a temperature detection sensor 44 at the bottom.

[0044] The silver powder washing kettle 3 is connected to the atomizing nozzle 41 through a pipeline.

[0045] The classifying cyclone 5 is divided into a first-stage classifying cyclone 51 , a second-stage classifying cyclone 52 , and a third-stage classifying cyclone 53 which are arranged in sequence.

[0046] The crushing and modifying module 6 includes a primary air mill 61 , a secondary coating and modifying device 62 , a coating agent preparation kettle 63 , and an agent metering pump 64 ; and high-speed air flow nozzles 65 are provided at the bottom of the primary air mill 61 and the secondary coating and modifying device 62 .

[0047] A product collecting tank 531 is provided at the bottom of the three-stage grading cyclone 53 .

[0048] The gas filter 7 is provided with an ultrafine silver powder collecting tank 71 at the bottom, a circulating air inlet 72 at the side, a back-blowing gas distributor 73 and a circulating air outlet 74 at the top.

[0049] The condensation collection module 9 includes a condensation heat exchanger body 91 , an ethanol recovery storage tank 92 at the bottom of the condensation heat exchanger body 91 , and a chiller 93 .

[0050] Based on the above structural design, the outlet pipe of the nitrogen generator 1 is respectively connected to the nitrogen heater 2, the high-speed airflow nozzle 65 of the first-level airflow mill 61 and the second-level coating modifier 62 belonging to the crushing and modification module 6, and the backwash gas distributor 73 arranged on the top of the gas filter 7.

[0051] The silver powder metering pump 31 of the silver powder washing kettle 3 is connected in parallel with the nitrogen heater 2 through a pipeline and is connected to the atomizing nozzle 41 of the air flow dryer 4.

[0052] The air material discharge port 43 of the air flow dryer 4 is connected to the feed port of the first-stage classification cyclone 51, and the bottom discharge port of the first-stage classification cyclone 51 is connected to the feed port of the first-stage air flow mill 61; the discharge port of the first-stage air flow mill 61 is connected to the feed port of the second-stage classification cyclone 52, and the bottom discharge port of the second-stage classification cyclone 52 is connected to the feed port of the second-stage coating modifier 62, and the discharge port of the second-stage coating modifier 62 is connected to the feed port of the third-stage classification cyclone 53.

[0053] The exhaust ports of the first-stage classification cyclone 51 , the second-stage classification cyclone 52 , and the third-stage classification cyclone 53 are all in communication with the circulating air inlet 72 of the gas filter 7 .

[0054] At the same time, the coating agent preparation kettle 63 is connected to the high-speed airflow nozzle 65 at the bottom of the secondary coating modifier 62 through the agent metering pump 64.

[0055] The circulating air outlet 74 of the gas filter 7 is connected to the air inlet of the negative pressure induced draft fan 8, and the air outlet of the negative pressure induced draft fan 8 passes through the condensing heat exchanger body 91 and the circulating air heater 10 in sequence, and finally connects to the circulating air return port 42 of the air flow dryer 4.

[0056] The water chiller 93 is in communication with the condensing heat exchanger body 91 for water inlet and outlet, and a pressure regulating valve 11 is installed on the outlet pipe of the condensing heat exchanger body 91 .

[0057] The working process and working principle of the integrated device for surface modification of silver powder by airflow method provided by the utility model are as follows:

[0058] First, the nitrogen generator 1 is activated to supply nitrogen, the nitrogen heater 2 is activated to heat the nitrogen, and the negative pressure induced draft fan 8 is activated, allowing the heated nitrogen to enter the air flow dryer 4 through the drying atomizing nozzle 41. When the temperature detection sensor 44 in the air flow dryer 4 detects that the temperature reaches the required level, the silver powder metering pump 31 configured in the silver powder washing kettle 3 is activated, causing the silver powder slurry to be sprayed through the atomizing nozzle 41, achieving liquid vaporization and drying of the silver powder within the air flow dryer 4 under high-temperature atomization conditions.

[0059] The dried silver powder and vaporized gas mixture, accompanied by high-temperature nitrogen, is then discharged through the air outlet 43 at the bottom of the air dryer 4 by the negative pressure induced draft fan 8. It then enters the primary grading cyclone 51 for gas-solid separation of the silver powder. The silver powder then passes through the bottom outlet of the primary grading cyclone 51 and falls into the primary air mill 61. Simultaneously, the nitrogen generator 1 supplies nitrogen to the primary air mill 61 through the high-speed airflow nozzle 65 at the bottom of the primary air mill 61, breaking up and disaggregating the agglomerated silver powder within the primary air mill 61. The broken and disaggregated silver powder then enters the secondary grading cyclone 52 under the action of the negative pressure airflow for further gas-solid separation of the silver powder.

[0060] Next, the silver powder after the secondary gas-solid separation falls into the secondary coating modifier 62. At this time, the coating agent in the coating agent preparation kettle 63 enters the high-speed airflow nozzle 65 at the bottom of the secondary coating modifier 62 simultaneously with nitrogen through the agent metering pump 64, realizing the dry coating of the silver powder after the coating agent is vaporized.

[0061] The coated silver powder enters the three-stage classification cyclone 53 under the action of negative pressure airflow to achieve gas-solid separation of the silver powder again.

[0062] The silver powder separated three times completes deagglomeration, crushing and coating to realize product preparation and falls into its product collection tank 531. The gas containing a certain amount of ultrafine silver powder from the exhaust port of the first-stage classification cyclone 51, the second-stage classification cyclone 52 and the third-stage classification cyclone 53 enters through the circulating air inlet 72 of the gas filter 7 to realize gas filtration and ultrafine silver powder recovery.

[0063] As the device system works for an extended period of time, the back-blowing gas distributor 73 provided on the top of the gas filter 7 is activated, causing the ultrafine silver powder inside to fall into the ultrafine silver powder collecting tank 71 at the bottom.

[0064] The filtered nitrogen is discharged through its circulating air outlet 74 and enters the negative pressure induced draft fan 8. The high-temperature nitrogen contains ethanol vapor. The nitrogen containing ethanol vapor enters the condensing heat exchanger body 91 through the outlet of the negative pressure induced draft fan 8. At this point, the chiller 93 is activated to cool the condensing heat exchanger body 91, causing the ethanol vapor to condense within the condensing heat exchanger body 91 and flow back to the ethanol recovery tank 92. The nitrogen, after condensation and separation of the ethanol vapor, is then reheated by the circulating air heater 10.

[0065] Finally, the circulating air nitrogen that meets the temperature requirement flows back into the air flow dryer 4 through the circulating air return port 42 of the air flow dryer 4 to realize the gas circulation of the system device. When the internal pressure of the air flow dryer 4 is too high, the gas pressure regulating valve 11 on the pipeline of the system device is opened to discharge part of the gas.

[0066] In summary, this utility model provides an integrated device for surface modification of silver powder using an airflow method, which relates to the field of powder surface modification technology and integrates a series of functions, including silver powder drying, crushing, coating modification, and classification. The device consists of a nitrogen generator, a nitrogen heater, a silver powder washing kettle, an airflow dryer, a classifying cyclone, a crushing and modification module, a gas filter, a negative pressure induced draft fan, a condensate collection module, a circulating air heater, and a pressure regulating valve. Among them, the silver powder washing kettle discharge port is equipped with a silver powder metering pump; the air flow dryer is provided with an atomizing nozzle on the top, a circulating air return port on the side, and an air material discharge port and a temperature detection sensor at the bottom; the grading cyclone is divided into one, two and three-stage grading cyclones; the crushing and modification module includes a first-stage air flow mill, a second-stage coating modifier, a coating agent preparation kettle, a agent metering pump, and the first-stage air flow mill and the second-stage coating modifier are both provided with high-speed air flow nozzles at the bottom; the three-stage grading cyclone is provided with a product collection tank at the bottom; the gas filter is provided with an ultrafine silver powder collection tank at the bottom, a circulating air inlet on the side, a backflush gas distributor and a circulating air outlet at the top; the condensation collection module includes a condensation heat exchanger body, an ethanol recovery storage tank at the bottom of the condensation heat exchanger body, and a chiller. The utility model realizes the centralized, rapid and efficient operation of the post-processing process of silver powder preparation, reduces the land area and personnel input, and at the same time, the one-stop service reduces the risk of precious metal loss in the silver powder preparation process, realizes the refined preparation and collection of required products, the screening of ultrafine silver powder, and the recovery of ethanol reagents in the preparation process, thereby reducing the dosage of coating reagents.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An integrated device for surface modification of silver powder using an airflow method, characterized in that: Including nitrogen generator, nitrogen heater, silver powder washing kettle, air flow dryer, classification cyclone, crushing and modification module, negative pressure induced draft fan; The nitrogen generator and the nitrogen heater are connected to form a high-temperature gas passage; the high-temperature gas passage is connected in parallel with the silver powder washing kettle through a pipeline and is connected to the air flow dryer; The gas outlet pipe of the nitrogen generator is connected to the crushing and modification module; The top feed port and bottom discharge port of the grading cyclone are respectively connected to the air flow dryer and the crushing and modification module pipeline; The air outlet of the negative pressure induced draft fan is connected to the gas pipeline of the air flow dryer.

2. The integrated device for surface modification of silver powder by airflow method according to claim 1, characterized in that: The top of the air flow dryer is provided with an atomizing nozzle, the side is provided with a circulating air return port, the bottom is provided with an air material discharge port and a temperature detection sensor; the air material discharge port is connected to the top feed port pipeline of the grading cyclone.

3. The integrated device for surface modification of silver powder by airflow method according to claim 1, characterized in that: The integrated device for surface modification of silver powder by airflow method also includes a gas filter; a circulating air inlet is provided on the side of the gas filter and a circulating air outlet is provided on the top; the circulating air inlet is connected to the grading cyclone pipeline; the circulating air outlet is connected to the air inlet pipeline of the negative pressure induced draft fan.

4. The integrated device for surface modification of silver powder by airflow method according to claim 3, characterized in that: An ultrafine silver powder collecting tank is provided at the bottom of the gas filter, and a back-blowing gas distributor is also provided at the top; the back-blowing gas distributor is connected to the gas outlet pipe of the nitrogen generator.

5. The integrated device for surface modification of silver powder by airflow method according to claim 2, characterized in that: The integrated device for surface modification of silver powder by airflow method also includes a condensation collection module arranged between the air outlet of the negative pressure draft fan and the connecting pipe of the airflow dryer; the condensation collection module includes a condensation heat exchanger body, an ethanol recovery storage tank arranged at the bottom of the condensation heat exchanger body, and a chiller.

6. The integrated device for surface modification of silver powder by airflow method according to claim 5, characterized in that: The integrated device for surface modification of silver powder by air flow method also includes a circulating air heater arranged between the air outlet of the negative pressure draft fan and the connecting pipe of the air flow dryer; the two ends of the circulating air heater are respectively connected to the circulating air return port and the condensation collection module pipe of the air flow dryer.

7. The integrated device for surface modification of silver powder by airflow method according to claim 6, characterized in that: A pressure regulating valve is provided on the communication pipe between the circulating air heater and the condensation collection module.

8. The integrated device for surface modification of silver powder by airflow method according to claim 1, characterized in that: The classifying cyclone comprises a first-stage classifying cyclone, a second-stage classifying cyclone, and a third-stage classifying cyclone connected in sequence; A product collecting tank is provided at the bottom of the three-stage grading cyclone.

9. The integrated device for surface modification of silver powder by airflow method according to claim 8, characterized in that: The crushing and modifying module includes a primary jet mill connected to the bottom of the primary classification cyclone, a secondary coating modifier connected to the bottom of the secondary classification cyclone, and a coating agent preparation kettle; A reagent metering pump is provided on the communicating pipe between the coating reagent preparation kettle and the bottom of the secondary coating modifier.

10. The integrated device for surface modification of silver powder by airflow method according to claim 9, characterized in that: The bottoms of the first-stage airflow mill and the second-stage coating modifier are both provided with high-speed airflow nozzles; the high-speed airflow nozzles are connected to the air outlet pipe of the nitrogen generator.

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