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CN-121972671-A - Metal granulating system and granulating process

CN121972671ACN 121972671 ACN121972671 ACN 121972671ACN-121972671-A

Abstract

The invention discloses a metal granulating system and a granulating process, wherein the metal granulating system comprises a metal granulating component, a solid-liquid separator and a metal particle drying chamber which are sequentially connected, a cooling tower is connected between the metal granulating component and the solid-liquid separator, the metal granulating component comprises a barrel, a metal liquid tundish component and a metal liquid blanking component which are sequentially arranged at the upper part of the barrel, a rotary table which is rotatably arranged in the barrel, a conical body which is arranged at the center of the upper end surface of the rotary table and is upwards at the top, a plurality of chute which are arranged at the periphery of the center of the conical body and are circumferentially arranged at intervals, an annular water curtain which is used for forming downward spraying is arranged at the upper part of the inside of the barrel, the annular water curtain is positioned at the periphery of the rotary table, a discharge port which is used for discharging a mixture of water and solid metal particles is arranged at the bottom of the barrel, the annular chute is an arc chute, and a plurality of the annular water curtains are arranged at the top of the barrel. The invention realizes the utilization of the waste heat of the granulation and has good granulation uniformity.

Inventors

  • WEI HONGBIAO

Assignees

  • 江阴市创裕机械有限公司

Dates

Publication Date
20260505
Application Date
20260115

Claims (10)

  1. 1. A metal granulating system is characterized by comprising a metal granulating assembly, a solid-liquid separator and a metal particle drying chamber which are sequentially arranged and connected according to a metal granulating process, wherein a cooling tower for realizing internal cooling of the metal granulating assembly through a circulating pipeline is arranged between the metal granulating assembly and the solid-liquid separator, the metal granulating assembly comprises a barrel, a metal liquid tundish assembly arranged on the upper part of the barrel and used for receiving metal liquid, a metal liquid blanking assembly arranged at the lower end of the metal liquid tundish assembly and positioned in the barrel, a rotary table rotatably arranged in the barrel and positioned below a blanking port of the metal liquid blanking assembly, a conical body arranged at the central position of the upper end face of the rotary table and with the top upwards, the conical body comprises a smooth surface conical body region positioned at the central part of the conical body and a grooved conical body region positioned at the periphery of the central part of the conical body, a plurality of grooves are formed in the grooved conical body region at intervals, annular water used for forming downward spraying is arranged at the upper position inside the barrel, the annular water curtain is arranged at the periphery of the rotary table and positioned at the lower part of the blanking port of the metal liquid tundish, the annular water curtain is used as an arc-shaped water discharging port, and the annular water curtain is arranged at the bottom of the rotary table and is used for discharging steam particles, and the annular water curtain is arranged at the bottom of the annular water curtain is used for discharging the drum.
  2. 2. The metal granulating system according to claim 1, wherein the solid-liquid separator comprises a water tank body, a filter screen assembly which is arranged in the water tank body and is obliquely arranged, the filter screen assembly divides the interior of the water tank body into an upper chamber and a lower chamber, a cooling water tank at the lower part of the cylinder body is connected to the upper chamber of the solid-liquid separator through a conveying pipeline which is in butt joint with the discharge port, a two-phase flow pump is arranged on the conveying pipeline, and a metal particle discharge port is arranged at the lower position of the filter screen assembly which is obliquely arranged on the water tank body.
  3. 3. A metal granulating system according to claim 2, wherein the number of said filter screen assemblies is plural and arranged in the water tank body at intervals up and down, and the mesh diameter of the filter screen assembly located at the upper layer is larger than that of the filter screen assembly located at the lower layer, thereby forming a classification of metal particles, and the metal particles in different diameter ranges are discharged through the classification discharge port, respectively.
  4. 4. A metal granulating system according to claim 2, wherein an annular spray pipe for forming the annular water curtain is arranged at the upper position inside the cylinder, and the lower end of the annular spray pipe is provided with annular spray slits in the circumferential direction or spray holes densely distributed in the circumferential direction.
  5. 5. The metal granulating system according to claim 4, further comprising a metal particle conveyor belt disposed at a metal particle discharge port of the solid-liquid separator, wherein the metal particle conveyor belt is connected to a metal particle drying chamber, and a heat exchanger for metal particle drying is disposed in the metal particle drying chamber, wherein the heat exchanger comprises a steam heat exchanger and a hot water heat exchanger, wherein a steam discharge pipe at the top of the cylinder is connected to the steam heat exchanger to realize waste heat utilization of steam, and a hot water circulation line is connected between a lower chamber of the solid-liquid separator and the hot water heat exchanger to realize waste heat utilization of hot water.
  6. 6. A metal granulating system according to claim 5, wherein the cooling tower is connected to the annular spray pipe inside the cylinder by a first circulation line, and the lower chamber of the solid-liquid separator is connected to the cooling tower by a second circulation line.
  7. 7. The metal granulating system according to claim 1, wherein a rotary table rotary driving device is arranged in the barrel body and below the rotary table, the rotary table rotary driving device comprises a closed protection barrel and a gear box arranged in the closed protection barrel, an output shaft of the gear box passes through the closed protection barrel upwards and then is connected with the rotary table, a dynamic sealing assembly is arranged between the output shaft of the gear box and the closed protection barrel, the rotary table rotary driving device further comprises a transverse protection sleeve connected with the closed protection barrel and penetrating and extending to the outside of the barrel body, and a transverse input shaft is arranged on the gear box and is arranged in the transverse protection sleeve.
  8. 8. The metal granulating system according to claim 7, further comprising a metal liquid column crushing enhancer for accelerating metal liquid column crushing, wherein the metal liquid column crushing enhancer comprises a pulse type high-pressure annular water knife arranged at the end part of the closed type protection cylinder and positioned right below the rotary table, the water outlet direction of the pulse type high-pressure annular water knife is arranged obliquely upwards towards the outer side direction of the rotary table, an annular valve core is arranged inside the pulse type high-pressure annular water knife, a plurality of reciprocating lifters are arranged inside the closed type protection cylinder, and lifting shafts of the reciprocating lifters are connected with the annular valve core inside the pulse type high-pressure annular water knife.
  9. 9. A granulation process employing a metal granulation system as defined in any one of claims 1 to 8, characterized by comprising the steps of: s1, preparing and conveying a melt, namely introducing molten metal in a smelting furnace into a metal liquid tundish component of a device through a diversion trench, forming stable and continuous metal liquid flow through a control valve or a stopper rod, and entering a metal liquid blanking component; S2, centrifugal dispersion and primary molding, namely, freely falling a metal liquid flow, striking on a central cone of a turntable rotating at a high speed, uniformly dispersing the metal liquid flow into each arc chute to form a metal liquid column, throwing the metal liquid column out from the tail end of the chute under the action of centrifugal force, and stretching and breaking to form metal liquid drops with relatively uniform size; s3, controllable cooling and solidification, namely, immediately passing metal liquid drops thrown out from a rotary table through an annular water curtain formed by an annular spray pipe, rapidly cooling the high-temperature liquid drops by the annular water curtain to solidify the surface layer of the high-temperature liquid drops, fixing the surface layer of the high-temperature liquid drops to form soft particles, and discharging high-pressure steam generated in the cooling process through a steam discharge port at the end part of the cylinder body so as to avoid the risk of high-pressure steam explosion; S4, deep cooling and collecting, namely, the primarily solidified particles fall into a cooling water tank at the lower part of the cylinder body, finish final cooling in the process of settling to the bottom of the tank, and completely solidify into solid metal particles; S5, grading and circulating, namely grading particles according to particle sizes in a solid-liquid separator through a multi-layer inclined filter screen assembly and discharging the particles from different grading discharge ports respectively, wherein separated hot water flows into a lower chamber of a water tank, is conveyed to a cooling tower through a pipeline to be cooled, and is supplied to an annular spray pipe and a pulse high-pressure annular water knife again as cooling circulating water, so that the closed-loop utilization of water resources is realized.
  10. 10. The granulating process of a metal granulating system according to claim 9, wherein a liquid column crushing and reinforcing process is additionally arranged between the centrifugal dispersion and primary forming of the step S2 and the controllable cooling and solidifying process of the step S3, and the liquid column crushing and reinforcing process utilizes a pulse type high-pressure annular water knife below a rotary table, and drives an annular valve core inside the pulse type high-pressure annular water knife to reciprocate with a certain frequency through a reciprocating lifter, so that the flux of a water jet of the pulse type high-pressure annular water knife is periodically changed, a pulse type high-pressure cutting water flow with a certain frequency is generated, and the metal liquid column thrown from the rotary table is impacted to assist in breaking, so that the size of finally generated metal particles is further refined and homogenized.

Description

Metal granulating system and granulating process Technical Field The invention relates to the technical field of metal material preparation, in particular to a metal granulating system and a granulating process. Background In the metallurgical industry, molten metal is formed into granular products for convenient transportation, storage and subsequent smelting. The conventional granulation method mainly has the following defects: The water quenching method is to directly flush the metal liquid flow into a large amount of cooling water, and to break and solidify the metal liquid flow by using thermal shock. The method is simple, but the produced particles have irregular shape, wide particle size distribution and high pulverization rate, and the potential safety hazard of steam explosion caused by rapid vaporization of water exists. In addition, the consumption of cooling water is large, the treated water contains a large amount of metal fine powder, and the environmental protection pressure is high. The casting method (such as Mintek Blobulator) is to produce a flat ellipsoidal block with larger size by coupling with water flow in the same direction. The method is relatively safe, the granularity is uniform, but the granularity of the product is generally more than 20mm, the product belongs to the category of large particles, the market requirement on metal particles with smaller granularity (such as 1-10 mm) cannot be met, and the equipment flow is long. The ingot breaking method is to cast metal into ingot and break the ingot with mechanical equipment. The process has high energy consumption, complicated steps and serious noise and dust pollution. Therefore, there is a need in the art for an apparatus and process that can efficiently and controllably produce small and medium sized, high sphericity, uniform particle size metal particles. Disclosure of Invention In order to solve the problems, the invention provides a metal granulating system and a granulating process, and aims to provide a metal granulating scheme based on centrifugal crushing and controllable cooling so as to produce metal particles with uniform granularity and high sphericity and realize the waste heat utilization in the granulating process. The specific technical scheme is as follows: The utility model provides a metal granulating system, includes the metal granulating subassembly that is used for making the metal liquid solid metal granule, the metal granulating subassembly includes the barrel, sets up be in the middle of the metal liquid package subassembly of barrel upper portion is used for accepting the metal liquid, set up in the middle of the metal liquid package subassembly lower extreme and be located the inside metal liquid blanking subassembly of barrel, rotate the setting and be in the barrel is inside and be located the carousel of metal liquid blanking subassembly blanking mouth below position, set up carousel up end central point puts and be the conical body up, the conical body includes the plain noodles conical body region that is located conical body central point put and is located conical body central point is regional with the fluting conical body that is located the periphery is put in conical body central point is put and is offered along circumference interval arrangement's a plurality of spouts the inside top position of barrel is provided with and is used for forming the annular water curtain that sprays downwards, annular water curtain is located the periphery of carousel, the lower part of barrel is provided with the discharge gate that is used for discharging water and solid metal granule mixture as cooling water pond its bottom. Preferably, the chute is an arc chute. Preferably, the cooling water pool at the lower part of the cylinder body is a conical funnel water pool. In the invention, a liquid level pipe is connected to the cylinder, a liquid level sensor for monitoring the liquid level of the cooling water tank is arranged on the liquid level pipe, and a water supplementing pipe for maintaining the liquid level of the cooling water tank is also arranged on the cylinder. In the invention, the number of the annular water curtains is multiple and is arranged at intervals. In the invention, an annular spray pipe for forming the annular water curtain is arranged at the upper position inside the cylinder body, and annular spray slits are arranged at the lower end of the annular spray pipe along the circumferential direction or spray holes are densely arranged along the circumferential direction. Preferably, an annular cooling water distribution box can be further arranged at the top of the cylinder, and the annular cooling water distribution box is connected with the annular spray pipe through a plurality of cooling water distribution pipes distributed at intervals along the circumferential direction, so that the uniformity of the water curtain is improved. Preferably, a steam exhaust pipe for exhausting stea