A manganese iron alloy dry slag treatment system and a treatment method thereof

Abstract

The application discloses a manganese-iron alloy dry slag treatment system and a treatment method thereof. The dry slag treatment system comprises a stock bin, a first crushing device, a spiral classifier, a shaking table, a jigging machine, a sand washer and a wastewater treatment device. After being crushed by the first crushing device, the manganese-iron alloy dry slag enters the spiral classifier for classification. The coarse particles after classification enter the jigging machine for screening, and the fine particles enter the shaking table for screening. The concentrates selected by the jigging machine and the shaking table enter the concentrate pool of the stock bin for recycling. The coarse particle tailings screened by the jigging machine are cleaned by the sand washer, then conveyed back to the stock bin for secondary treatment. The fine slag and wastewater washed out by the sand washer and the fine slag and wastewater discharged by the shaking table enter the wastewater treatment device for pressure filtration, and then dry sand is obtained for external sale. The manganese-iron alloy dry slag treated by the treatment method of the application does not need to consume a large amount of water resources for water quenching, and the comprehensive utilization rate and comprehensive economic benefits of the manganese-iron alloy dry slag can be effectively improved, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of manganese-based ferroalloy smelting technology, specifically to a dry slag treatment system and method for manganese-ferroalloys. Background Technology

[0002] Ferromanganese alloy is an indispensable additive in steel manufacturing. It is mainly composed of manganese and iron. When producing ferromanganese alloy products of different grades using traditional production processes, after the final slag is obtained by ladle smelting, it is usually treated by water quenching. Water quenching inevitably consumes a large amount of water resources. Even though most of the wastewater generated by water quenching can be recycled, some water still evaporates due to high temperature and cannot be reused. Moreover, in recent years, with the increasing scarcity of manganese ore resources and the extremely low utilization rate of ferromanganese alloy final slag, production costs have been rising year by year.

[0003] Chinese patent application publication number CN114471937A discloses a method for comprehensively recovering iron and manganese minerals from water-quenched slag in ferrosilicon alloy smelting. This patent application adopts a combined gravity and magnetic process of "coarse-grained jigging gravity separation - fine-grained sluice pre-enrichment - coarse-grained regrinding - fine-grained stepped field-strength magnetic separation", which recovers elemental iron, ferromanganese alloy and iron and manganese metal oxide minerals in water quenching. Although it can improve the comprehensive recovery rate of ferrosilicon alloy and iron and manganese minerals in ferrosilicon alloy smelting slag, it still consumes a large amount of water resources for water quenching. Therefore, how to further recover manganese concentrate from the final slag and comprehensively utilize the remaining part to reduce resource waste has been a long-term goal. Summary of the Invention

[0004] The main objective of this invention is to overcome the deficiencies of the prior art and provide a dry slag treatment system and method for ferromanganese alloys.

[0005] To achieve the above objectives, the present invention proposes a ferromanganese alloy dry slag treatment system, comprising a silo, a first crushing device, a spiral classifier, a shaking table, a jig, a sand washing machine, and a wastewater treatment device. The silo is connected to the starting end of a first conveyor belt, and the feed inlet of the first crushing device is connected to the ending end of the first conveyor belt. The ferromanganese alloy dry slag poured into the raw material pool of the silo is conveyed to the first crushing device for crushing via the first conveyor belt. The discharge outlet of the first crushing device is connected to the feed inlet of the spiral classifier. The crushed slag enters the spiral classifier for classification. The reverse sand outlet of the spiral classifier is connected to the feed end of the jig. The feed trough of the shaking table is connected to the overflow trough of the spiral classifier. The classified fine slag enters the shaking table for screening, while the classified coarse slag enters the jig for jigging and gravity separation. The concentrate end of the shaking table and the heavy concentrate outlet of the jig are both connected to the concentrate pool of the silo. The screened concentrate is directly returned to the concentrate pool for storage and recycling. The feed inlet of the sand washing machine is connected to the tailings outlet of the jig, and the discharge outlet of the sand washing machine is connected to the temporary storage tank of the silo. This is used to wash the coarse tailings after jig gravity separation. The resulting coarse tailings are then ready for a second crushing. The wastewater treatment device includes a collection tank, a sedimentation tank, a settling tank, a return water tank, and a filter press. The mud inlet of the sand washing machine, the tailings end of the shaking table, and the filter press outlet are all connected to the collection tank. The collection tank is connected to the sedimentation tank. The sand outlet is connected to the filter press, the sedimentation tank is connected to the settling tank, and the settling tank is connected to the return water tank. The fine tailings and wastewater mixture from the tailings end of the shaking table, the fine tailings and wastewater mixture from the mud water outlet of the sand washing machine, and the filter water enter the collection tank for collection. The tailings are filtered by the filter press to obtain dry sand for sale. The water used by the spiral classifier, the shaking table, the jig, and the sand washing machine is recycled to avoid water waste.

[0006] Furthermore, the jig includes a jig body and a sorting mechanism. The feed end and the tailings outlet are respectively located at opposite ends of the jig body. The sorting mechanism is located below the tailings outlet and includes a magnetic separator and a sorting tank. The magnetic separator is rotatably connected to the sorting tank, allowing the tailings flowing down from the tailings outlet to wash onto the magnetic separator and drive it to rotate. The sorting tank has a partition that divides its interior into a concentrate zone and a tailings zone. The concentrate zone is connected to the feed inlet of the sand washing machine, and the tailings zone is connected to the collection tank. The sorting mechanism performs a third screening of the tailings after jig gravity separation, improving the recovery rate.

[0007] Furthermore, the magnetic separator wheel includes several sets of bar electromagnets, a drum, and a first roller. The first roller is mounted on the sorting tank, and the drum is fitted onto the first roller. The several sets of bar electromagnets are evenly distributed on the outer circumference of the drum. The first roller is equipped with a conductive slip ring and a generator, respectively. The generator is electrically connected to a storage battery, and the bar electromagnets are electrically connected to the storage battery through the conductive slip rings. By having the tailings from the jigging gravity separation wash over the bar electromagnets on the magnetic separator wheel, the generator generates electricity and stores it in the storage battery to power the bar electromagnets. Screening (magnetic separation) can be completed without consuming additional energy, effectively saving energy.

[0008] Furthermore, a circular grating is provided at the end of the first roller, which is used to detect the angle of rotation of the first roller in order to control the energization or de-energization of the bar electromagnet accordingly.

[0009] Furthermore, the two side walls of the sorting tank are horizontally provided with first elongated holes, and a bearing plate is provided in the first elongated hole. The two ends of the first roller are mounted on the bearing plate. By adjusting the position of the bearing plate within the first elongated hole, the position of the magnetic separator can be adjusted, so that the tailings can be accurately washed onto the bar electromagnet, thereby improving the screening efficiency.

[0010] Furthermore, the bearing plate is provided with a second elongated hole, and a second roller is provided inside the second elongated hole. The second roller is parallel to the first roller, and a plurality of bristles are provided on the circumferential surface of the second roller, with the bristles corresponding to the bar electromagnet. The bristles can effectively brush off the concentrate remaining on the bar electromagnet.

[0011] Furthermore, the two side walls of the sorting tank are provided with a third elongated hole horizontally. The third elongated hole is located below the first elongated hole and is parallel to the first elongated hole. Several insertion holes are provided next to the third elongated hole. The partition is provided with fixing ears at both ends. The fixing ears are inserted into the third elongated hole, so that the partition can move along the third elongated hole and the fixing ears are fixed by inserting pins into the insertion holes.

[0012] This invention also discloses a method for treating dry slag using the aforementioned ferromanganese alloy dry slag treatment system, comprising the following steps:

[0013] S1. The cooled manganese-iron alloy dry slag is transported to the silo and then conveyed to the first crushing device by the first conveyor belt for crushing. The particle size after crushing is 10-30mm.

[0014] S2. The slag particles from the first crushing device enter the spiral classifier for classification. Coarse slag particles with a diameter greater than 30mm enter the jig for jigging and gravity separation through the reverse sand inlet of the spiral classifier. Fine slag particles with a diameter less than 30mm enter the feed trough of the shaking table for screening through the overflow trough of the spiral classifier.

[0015] S3. The concentrate shaken from the shaking table returns to the concentrate pool in the silo, while the fine tailings and wastewater mixture is discharged into the collection pool of the wastewater treatment device.

[0016] S4. The heavy concentrate separated from the jig returns to the concentrate pool in the silo, while the light tailings enter the sand washing machine through the tailings inlet. Under the action of the rollers in the sand washing machine, the tailings tumble and grind against each other, removing impurities covering the surface of the slag particles. At the same time, the water vapor layer covering the slag particles is destroyed to facilitate dehydration. By adding water, a strong water flow is generated, which carries away impurities and foreign objects with a small specific gravity, thus completing the washing process. After the washing is completed, the coarse slag is transferred back to the temporary storage pool in the silo to wait for the second crushing, while the mixture of light and fine slag and sand washing wastewater is discharged into the collection pool.

[0017] S5. After the wastewater mixture in the collection tank enters the sedimentation tank, the sediment at the bottom is pumped to the filter press to filter out the water. The filtered water is recycled back to the collection tank, and the dry sand is sold externally.

[0018] Further, in step S4, the light tailings after jigging gravity separation flow through the tailings outlet on one side of the jigging machine body to the lower sorting mechanism for magnetic separation. The magnetically separated concentrate returns to the concentrate pool in the silo or the temporary storage pool in the silo, while the magnetically separated coarse tailings enter the sand washing machine. During magnetic separation, the tailings after jigging gravity separation flow down from the tailings outlet and wash the magnetic separator wheel of the sorting mechanism, causing it to rotate. This, in turn, drives the generator to rotate and generate electricity. The electrical energy generated by the generator is stored in the battery and supplies power to the bar electromagnet through the conductive slip ring. When the bar electromagnet is energized, it attracts the magnetic concentrate, while the non-magnetic tailings fall into the tailings area below. After the magnetic concentrate rotates to the top of the concentrate area with the bar electromagnet, the bar electromagnet is de-energized, causing the magnetic concentrate to fall into the concentrate area, thus completing the magnetic separation.

[0019] Furthermore, as the magnetic concentrate rotates above the concentrate area with the bar electromagnet, the brush bristles, corresponding to the bar electromagnet, continuously brush off the magnetic concentrate residue adsorbed on the bar electromagnet.

[0020] The beneficial effects of this invention include: manganese-iron alloy dry slag is sequentially conveyed to the first crushing device via a conveyor belt for crushing; the crushed slag enters a spiral classifier for classification; the coarse particles obtained from classification enter a jig for jigging gravity separation; the fine particles obtained from classification enter a shaking table for screening; the tailings from the shaking table are collected in the collection tank of a wastewater treatment device; the tailings from the jig enter a washing machine for washing; the tailings from the washing machine are also collected in the collection tank of the wastewater treatment device; and the washed coarse slag is returned to the silo to await a second crushing. The slag is crushed and processed, while the concentrate selected by the shaking table and jig enters the concentrate pool of the return silo for compounding and calcination recovery. The tailings enter the wastewater treatment device and are filtered to obtain dry sand for external sale. This effectively improves the comprehensive utilization rate and comprehensive economic benefits of ferromanganese alloy slag and reduces production costs. The present invention can effectively treat the slag produced by smelting ferromanganese alloy without water quenching. The water used in the classification, shaking table screening and jig screening processes of the present invention can be recycled after being treated by the wastewater treatment device, saving a lot of water resources and eliminating wastewater discharge that pollutes the environment. Attached Figure Description

[0021] Figure 1 This is an overall schematic diagram of the manganese-iron alloy dry slag treatment system in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the jig machine in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the sorting tank in an embodiment of the present invention.

[0024] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0025] Figure 5 This is a schematic diagram of the magnetic separator in an embodiment of the present invention.

[0026] Figure 6 This is a flowchart of the method for processing dry residue in an embodiment of the present invention.

[0027] Reference numerals: 1. Hopper; 101. Raw material pool; 102. Temporary storage pool; 103. Concentrate pool; 2. First conveyor belt; 3. First crushing device; 4. Second conveyor belt; 5. Second crushing device; 6. Third conveyor belt; 7. Spiral classifier; 8. Fourth conveyor belt; 9. Shaking table; 10. Jig; 1001. Jig body; 1002. Sorting mechanism; 10021. Magnetic separator wheel; 10022. Sorting trough; 100221. First elongated hole; 100222. Shaft seat plate; 100223. Second elongated hole; 100224. Second roller; 100225. Brush bristles; 1002 26 Third elongated hole; 100227 Insertion hole; 10023 Partition plate; 10024 Concentrate area; 10025 Tailings area; 10026 Bar electromagnet; 10027 Drum; 10028 First roller; 10029 Conductive slip ring; 100210 Generator; 100211 Storage battery; 100212 Circular grating; 1003 Feed end; 1004 Tailings outlet; 11 Sand washing machine; 12 Fifth conveyor belt; 13 Wastewater treatment device; 1301 Water collection tank; 1302 Sedimentation tank; 1303 Sedimentation tank; 1304 Return water tank; 1305 Filter press. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0029] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be for both fixing and circuit connection purposes.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] Example 1

[0033] Please see Figure 1The ferromanganese alloy dry slag processing system disclosed in this invention includes a silo 1, a first crushing device 3, a spiral classifier 7, a shaking table 9, a jig 10, a sand washing machine 11, and a wastewater treatment device 13. The silo 1 is internally divided into a raw material pool 101, a temporary storage pool 102, and a concentrate pool 103. The raw material pool 101 is connected to the starting end of the first conveyor belt 2. The raw material pool 101 is used to store the ferromanganese alloy dry slag to be processed; the concentrate pool 103 is used to store the recovered concentrate to be compounded; and the temporary storage pool 102 is used to store coarse slag to be secondary processed. The feed inlet of the first crushing device 3 is connected to the ending end of the first conveyor belt 2. The ferromanganese alloy dry slag to be processed is conveyed to the first crushing device 3 for coarse crushing via the first conveyor belt 2. Of course, when crushing larger pieces of ferromanganese alloy... For ferroalloy dry slag, a second crushing device 5 can be installed. The second crushing device 5 is connected in series with the first crushing device 3 for two-stage crushing. Specifically, the first crushing device 3 is preferably a 260*100 jaw crusher. The discharge port of the first crushing device 3 is connected to the starting end of the second conveyor belt 4, and the feed port of the second crushing device 5 is connected to the ending end of the second conveyor belt 4. The dry slag after coarse crushing is conveyed again by the second conveyor belt 4 to the second crushing device 5 for fine crushing. The second crushing device 5 is preferably a 60*100 jaw crusher. Through two crushing processes, the dry slag particles are made more uniform, reducing the fine powder ratio. The discharge port of the second crushing device 5 is connected to the starting end of the third conveyor belt 6, and the feed port of the spiral classifier 7 is connected to the ending end of the third conveyor belt 6. The slag particles from the second crushing device 5 are conveyed to the spiral classifier 7 via the third conveyor belt 6 for classification. The reverse sand inlet of the spiral classifier 7 is connected to the feed end 1003 of the jig 10. The coarse slag produced after classification enters the jig for jigging and gravity separation. The feed trough of the shaking table 9 is connected to the overflow trough of the spiral classifier 7. The fine slag particles classified by the spiral classifier 7 overflow into the shaking table 9 for screening. Specifically, the spiral classifier 7 is preferably an FC-submerged single spiral classifier, and the shaking table 9 is preferably a 6-S shaking table. The jig processes the coarse slag particles, and the shaking table processes the fine slag particles to improve the recovery rate of ferromanganese alloy slag. Specifically, the jig 10 is preferably a JT2-2 or JT5-2 sawtooth wave jig, and the shaking table 9 separates the slag particles. The concentrate from the jig 10-stage separation and the concentrate from the jigging machine 10-stage separation are conveyed back to the concentrate pool 103 via the fourth conveyor belt 8 for stacking, to be fed into the refining furnace for co-firing and recovery. The light tailings from the jig 10-stage separation enter the sand washing machine 11 through the tailings inlet. Under the drive of the rollers of the sand washing machine 11, they tumble and grind each other, removing impurities covering the surface of the slag particles. At the same time, the water vapor layer covering the slag particles is destroyed to facilitate dehydration. By adding water, a strong water flow is generated to carry away impurities and foreign objects with low specific gravity, completing the washing process. The coarse slag after washing is conveyed back to the temporary storage pool 102 of the silo 1, waiting for the second crushing. The mixture of light and fine slag particles and sand washing wastewater is discharged into the collection pool 1301. Specifically, the sand washing machine 11 is preferably an XSD2610 wheel sand washing machine.The discharge port of the sand washing machine 11 is connected to the temporary storage tank 102 of the silo 1 via the fifth conveyor belt 12. After washing, the coarse-grained light tailings are conveyed back to the temporary storage tank 102 of the silo 1 via the fifth conveyor belt 12 for stacking, awaiting secondary treatment. The wastewater treatment device 13 includes a collection tank 1301, a sedimentation tank 1302, a settling tank 1303, a return water tank 1304, and a filter press 1305. The mud water inlet of the sand washing machine 11, the tailings end of the shaking table 9, and the filter press outlet of the filter press 1305 are all connected to the collection tank 1301. The collection tank 1301 is connected to the sedimentation tank 1302. The sand outlet of the sedimentation tank 1302 is connected to the filter press 1305. The overflow outlet at the top of the sedimentation tank 1302 is connected to the settling tank 1303. The overflow outlet at the top of the settling tank 1303 is connected to the settling tank 1303. The return water tank 1304 is connected to the spiral classifier 7, shaking table 9, jig 10, and sand washing machine 11. The collection tank 1301 collects the sand washing wastewater and fine slag mixture, the fine particle wastewater mixture from the jig, and the filter water from the filter press, preventing direct discharge of wastewater and environmental pollution. The collected wastewater enters the sedimentation tank 1302 for sedimentation. The sedimentation tank 1302 is preferably a box-type sedimentation tank, a curved sedimentation tank, or a channel sedimentation tank. After sedimentation, the sediment mixture is pumped to the filter press 1305 for filtration. After squeezing out the water, dry sand is obtained. The dry sand contains 73% SiO2, 5% CaO, and 3% MgO, which is higher than the 65% SiO2 content in ordinary river sand. The upper part of the sedimentation tank 1302 is clear. The water flows to sedimentation tank 1303 for further sedimentation treatment. An appropriate amount of flocculant can be added to this tank to improve sedimentation efficiency. To increase sand and gravel recovery, the sludge-water mixture at the bottom of sedimentation tank 1303 can also be pumped to filter press 1305 for filtration. The clear water from sedimentation tank 1303 enters return water tank 1304 for later use. After treatment by the wastewater treatment device 13 in this embodiment, the water used by the spiral classifier 7, shaking table 9, jig 10, and sand washing machine 11 can be recycled, preventing wastewater discharge and environmental pollution. In this embodiment, the manganese-ferromanganese alloy slag after shaking still contains about 0.5% Mn. After stabilization and cooling, dry slag is obtained. Compared to water-quenched slag (slag to water weight ratio), this is significantly better. The process (with a ratio of 1:8 or higher) significantly reduces water consumption. The resulting dry slag is crushed to obtain slag particles with a diameter of 10-30mm. These particles are then classified in a spiral classifier 7. Larger particles are fed into a jig 10 for jigging gravity separation, while finer particles are screened in a shaking table 9 to ensure high recovery rates. The concentrate obtained after jigging gravity separation and shaking table 9 screening is the concentrate to be recovered. The tailings from jigging gravity separation are then washed in a sand washing machine 11 to remove impurities covering the slag particles. They are then returned to the temporary storage tank 102 in the silo 1 for further crushing and screening to further improve the recovery rate. After screening, the concentrate contains 55% Mn, 32% Si, 0.1% C, and 0.07% P, with an overall Mn recovery rate exceeding 80%.

[0034] Example 2

[0035] Please see Figures 1 to 5To further improve the recovery rate of manganese concentrate, this embodiment adds a sorting mechanism 1002 for magnetic separation to the jig 10 in Embodiment 1. The tailings from the jig gravity separation are then discharged to the washing machine 11 for cleaning after magnetic separation. In this embodiment, the jig 10 includes a jig body 1001 and a sorting mechanism 1002. The feed end 1003 and the tailings outlet 1004 are respectively located at both ends of the jig body 1001. The sorting mechanism 1002 is located below the tailings outlet 1004. The sorting mechanism 1002 includes a magnetic separator 10021 and a sorting tank 10022. The magnetic separator 10021 is rotatably connected to the sorting tank 10022, so that the tailings flowing down from the tailings outlet 1004 can continuously wash against the magnetic separator. 10021, a magnetic separator 10021 is driven to rotate. A partition 10023 is provided inside the sorting tank 10022, vertically positioned directly below the magnetic separator 10021. The partition 10023 divides the internal space of the sorting tank 10022 into a concentrate area 10024 and a tailings area 10025. The concentrate area 10024 is connected to the concentrate pool 103 of the silo 1 via a fourth conveyor belt 8, allowing the magnetically separated concentrate to enter the concentrate pool 103 for storage and recycling. The tailings area 10025 is connected to a water collection pool 1301, allowing the magnetically separated tailings to enter the water collection pool 1301 for collection and pressure filtration for recycling. Specifically, the magnetic separator 10021 includes several sets of bar electromagnets 10026. A roller 10027 and a first roller 10028 are mounted horizontally across a sorting tank 10022. The roller 10027 is fixedly fitted onto the first roller 10028. Several sets of bar electromagnets 10026 are evenly distributed on the outer circumference of the roller 10027. The first roller 10028 is equipped with a conductive slip ring 10029 and a generator 100210. The generator 100210 is electrically connected to a battery 100211. The bar electromagnets 10026 are electrically connected to the battery 100211 through the conductive slip rings 10029. A circular grating 100212 is provided at the end of the first roller 10028. The circular grating 100212 is used to detect the rotation angle of the first roller 10028 for corresponding control. In this embodiment, the bar electromagnet 10026 is energized or de-energized. The bar electromagnet 10026 acts as the blade of the magnetic separator 10021. At least three groups of bar electromagnets 10026 are configured. The number of conductive rings in the conductive slip ring 10029 corresponds to the number of groups of bar electromagnets 10026. Each group of bar electromagnets 10026 is arranged in a 120° angle around the bar electromagnets 10026. The bar electromagnets 10026 in the same group are connected in parallel and can be energized or de-energized simultaneously. When the tailings from the jig 10 wash onto the bar electromagnet 10026, they drive the magnetic separator 10021 to rotate. The generator 100210 generates electricity and stores it in the battery 100211. The potential energy of the tailings is converted into electrical energy to power the bar electromagnet 10026.When tailings flowing from tailings outlet 1004 wash onto bar electromagnets 10026, the corresponding set of bar electromagnets 10026 is energized, attracting the magnetic concentrate, while the non-magnetic tailings fall into the tailings area 10025 below. When the circular grating 100212 detects that the bar electromagnets 10026 have rotated above the concentrate area 10024, the set of bar electromagnets 10026 is de-energized, allowing the magnetic concentrate to fall into the concentrate area 10024 below, completing the magnetic separation. This embodiment can complete the magnetic separation without additional electrical energy, saving energy and further improving the concentrate recovery rate.

[0036] Example 3

[0037] Please refer to the following: Figures 1 to 5To improve the working efficiency of the sorting mechanism 1002, this embodiment adds a first elongated hole 100221, a second elongated hole 100223, a second roller 100224, a brush bristle 100225, and a third elongated hole 100226 to the structure of embodiment 2. In this embodiment, the first elongated hole 100221 is horizontally arranged on both side walls of the sorting tank 10022. A bearing plate 100222 is provided inside the first elongated hole 100221. The two ends of the first roller 10028 are mounted on the bearing plate 100222. By moving the bearing plate 100222, the magnetic separator 10021 of the sorting mechanism 1002 can be moved left and right to adjust the magnetic... The position of the magnetic separator 10021 ensures that the tailings flowing from the tailings outlet 1004 accurately act on the magnetic separator 10021 to drive its rotation, preventing the tailings flow from the tailings outlet 1004 from being too large or too small to effectively reach the magnetic separator 10021. Simultaneously, a second elongated hole 100223 is provided on the shaft seat plate 100222, within which a second roller 100224 is installed. The second roller 100224 is parallel to the first roller 10028, and its circumferential surface is provided with several brush bristles 100225. These brush bristles 100225 interact with the bar electromagnet 1002. Correspondingly, the bristles 100225 are positioned behind the magnetic separator 10021 (above the concentrate zone 10024). When the magnetic separator 10021 rotates, it simultaneously drives the bristles 100225 to rotate, continuously brushing off the magnetic concentrate remaining on the bar electromagnet 10026, preventing the magnetic concentrate from circulating on the bar electromagnet 10026, thereby improving the efficiency of magnetic separation. A third elongated hole 100226 is also horizontally provided on both sides of the separation tank 10022. The third elongated hole 100226 is located below and parallel to the first elongated hole 100221. Several... The dry insertion hole 100227 and the partition plate 10023 are provided with fixing ears 100231 at both ends. The fixing ears 100231 are inserted into the third elongated hole 100226, so that the partition plate 10023 can move along the third elongated hole 100226. The fixing ears 100231 are fixed by inserting the pin 100232 into the insertion hole 100227. When the magnetic separator 10021 is moved and adjusted, the partition plate 10023 can also be moved left and right to adjust so that the partition plate 10023 is located directly below the magnetic separator 10021, so as to prevent the magnetic concentrate from entering the tailings area 10025 or the tailings from entering the concentrate area 10024, which would affect the magnetic separation results.

[0038] Example 4

[0039] See Figures 1 to 6 The present invention also proposes a method for treating dry slag using the above-mentioned ferromanganese alloy dry slag treatment system, comprising the following steps:

[0040] S1. The cooled manganese-iron alloy dry slag (Mn content 0.5%) is transported to the silo 1 and conveyed to the first crushing device 3 by the first conveyor belt 2 for crushing. The powder content of the crushed material is less than 1%, and the particle size after crushing is 10-30mm.

[0041] S2. The slag particles from the first crushing device 3 enter the spiral classifier 7 for classification. Coarse slag particles with a diameter greater than 30mm enter the jig 10 from the reverse sand inlet of the spiral classifier 7 for jigging and gravity separation. Fine slag particles with a diameter less than 30mm enter the feed trough of the shaking table 9 through the overflow trough of the spiral classifier 7 for screening.

[0042] S3. The concentrate shaken from the shaking table 9 returns to the concentrate pool 103 of the silo 1, while the fine tailings and wastewater mixture is discharged into the collection pool 1301 of the wastewater treatment device 13.

[0043] S4. The heavy concentrate separated from the jig 10 returns to the concentrate pool 103 in the silo 1, while the light tailings enter the sand washing machine 11 through the tailings port 1004. Under the drive of the rollers of the sand washing machine 11, the tailings tumble and grind each other to remove impurities covering the surface of the slag particles. At the same time, the water vapor layer covering the slag particles is destroyed to facilitate dehydration. By adding water, a strong water flow is generated to carry away impurities and foreign objects with low specific gravity, thus completing the washing process. The coarse slag after washing is transferred back to the temporary storage pool 102 in the silo 1 to wait for the second crushing, while the mixture of light and fine slag and sand washing wastewater is discharged into the collection pool 1301.

[0044] S5. After the wastewater mixture in the collection tank 1301 enters the sedimentation tank 1302, the sediment at the bottom is pumped to the filter press 1305 to filter out the water. The filtered water is recycled back to the collection tank 1301, and the dry sand is sold externally.

[0045] In step S4, the light tailings separated from the jig 10 undergo another round of magnetic separation before entering the washing machine 11 to further improve recovery efficiency. The light tailings flow through the tailings outlet 1004 to the sorting mechanism 1002 below for magnetic separation. The concentrate separated by magnetic separation returns to the concentrate pool 103 of the silo 1 or the temporary storage pool 102 of the silo 1. The coarse tailings separated by magnetic separation then enter the sand washing machine 11. During magnetic separation, the tailings after jig separation flow down from the tailings outlet 1004 and continuously wash the magnetic separator wheel 10021 of the sorting mechanism 1002, causing it to rotate. This, in turn, drives the generator 100210 to rotate and generate electricity. The electrical energy generated by the generator 100210 is stored in the battery 10. Within 0211, power is supplied to the bar electromagnet 10026 via the conductive slip ring 10029. When the bar electromagnet 10026 is energized, it attracts the magnetic concentrate, while the non-magnetic tailings fall into the tailings area 10025 below and are discharged into the collection tank 1301 of the wastewater treatment device 13. As the magnetic concentrate rotates with the bar electromagnet 10026 to the top of the concentrate area 10024, the bar electromagnet 10026 is de-energized. At the same time, since the brush 100225 corresponds to the bar electromagnet 10026, the brush 100225 continuously brushes off the residual magnetic concentrate adsorbed on the bar electromagnet 10026, so that most of the magnetic concentrate can fall into the concentrate area 10024, completing the magnetic separation.

[0046] The concentrate shaken from the shaking table 9 and the heavy concentrate separated by the jig 10 are conveyed back to the concentrate pool 103 in the silo 1 via the fourth conveyor belt 8, and then fed into the refining furnace for recycling after compounding. The concentrate composition is Mn 55%, Si 32%, C 0.1%, and P 0.07%.

[0047] After the wastewater collected in the collection tank 1301 enters the sedimentation tank 1302, the sediment at the bottom is pumped to the filter press 1305 to filter out the water. The filtered water is recycled back to the collection tank 1301, and the resulting dry sand with the composition of SiO2 73%, CaO 5%, and MgO 3% is sold externally. The mixed liquid at the top of the sedimentation tank 1302 enters the sedimentation tank 1303 for secondary sedimentation treatment. After secondary sedimentation treatment, the supernatant enters the return water tank 1304 for storage, which supplies water to the shaking table 9, jig 10, and sand washing machine 11, realizing the recycling of water resources and avoiding the discharge of wastewater and pollution of the environment.

[0048] After processing the dry slag of manganese-iron alloy using the method of this application, the manganese content in the obtained concentrate reaches more than 55%, the overall manganese recovery rate reaches more than 80%, and the SiO2 content in the obtained dry sand reaches 73%, which is higher than that in ordinary river sand. At the same time, the water resources in the treatment process can be recycled to achieve zero discharge.

[0049] The above description provides a further detailed explanation of the present invention in conjunction with specific / preferred embodiments, and it should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the scope of protection of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications can be made herein without departing from the scope of protection of the patent application.

Claims

1. A dry slag treatment system for ferromanganese alloys, characterized in that: include A hopper, which is connected to the starting end of the first conveyor belt; The first crushing device has its feed inlet connected to the end of the first conveyor belt and is used to crush the dry manganese-iron alloy slag that has been transferred to the silo. A spiral classifier, wherein the feed inlet of the spiral classifier is connected to the discharge outlet of the first crushing device, is used to classify the crushed manganese-iron alloy dry slag. A shaking table, wherein the feed trough of the shaking table is connected to the overflow trough of the spiral classifier, and the concentrate end of the shaking table is connected to the silo, for screening the fine slag after classification; A jig, wherein the feed end of the jig is connected to the reverse sand inlet of the spiral classifier, and the concentrate inlet of the jig is connected to the silo, is used for jigging and gravity separation of the classified coarse slag. A sand washing machine, wherein the inlet of the sand washing machine is connected to the tailings outlet of the jig, and the outlet of the sand washing machine is connected to the silo, is used to wash the coarse slag after jig gravity separation. A wastewater treatment device includes a collection tank, a sedimentation tank, a settling tank, a return water tank, and a filter press. The mud inlet of the sand washing machine, the tailings end of the shaking table, and the filter press outlet are all connected to the collection tank. The collection tank is connected to the sedimentation tank. The sand outlet of the sedimentation tank is connected to the filter press. The sedimentation tank is connected to the settling tank. The settling tank is connected to the return water tank. The return water tank is connected to the spiral classifier, the jig, and the sand washing machine. The jig includes a jig body and a sorting mechanism. The feed end and the tailings outlet are respectively located at both ends of the jig body. The sorting mechanism is located below the tailings outlet and includes a magnetic separator and a sorting tank. The magnetic separator is rotatably connected to the sorting tank, so that the tailings flowing down from the tailings outlet wash onto the magnetic separator, driving it to rotate. The sorting tank has a partition inside, which divides the interior of the sorting tank into a concentrate area and a tailings area. The concentrate area is connected to the silo, and the tailings area is connected to the collection pool. The magnetic separator includes several sets of bar electromagnets, a drum, and a first roller. The first roller is mounted on the sorting tank, and the drum is sleeved on the first roller. Several sets of bar electromagnets are evenly arranged on the outer circumference of the drum. The first roller is equipped with a conductive slip ring and a generator. The generator is electrically connected to a battery, and the bar electromagnets are electrically connected to the battery through the conductive slip rings.

2. The manganese-ferroalloy dry slag treatment system as described in claim 1, characterized in that: The first roller end is provided with a circular grating, which is used to detect the rotation angle of the first roller so as to control the energization or de-energization of the bar electromagnet accordingly.

3. The manganese-ferroalloy dry slag treatment system as described in claim 2, characterized in that: The sorting tank has a first elongated hole on each of its two side walls. A bearing plate is installed in the first elongated hole, and the two ends of the first roller are mounted on the bearing plate.

4. The ferromanganese alloy dry slag treatment system as described in claim 3, characterized in that: The bearing plate is provided with a second elongated hole, and a second roller is provided in the second elongated hole. The second roller is parallel to the first roller. A number of bristles are provided on the circumferential surface of the second roller, and the number of bristles corresponds to the strip electromagnet.

5. The ferromanganese alloy dry slag treatment system as described in claim 4, characterized in that: The sorting tank has a third elongated hole horizontally on both sides. The third elongated hole is located below the first elongated hole and is parallel to the first elongated hole. Several insertion holes are provided next to the third elongated hole. The partition has fixing ears at both ends. The fixing ears are inserted into the third elongated hole, so that the partition can move along the third elongated hole and the fixing ears are fixed by inserting pins into the insertion holes.

6. A method for treating dry slag using the manganese-ferroalloy dry slag treatment system of claim 5, characterized in that, Includes the following steps: S1. The cooled manganese-iron alloy dry slag is transported to the silo and then conveyed to the first crushing device by the first conveyor belt for crushing. The particle size after crushing is 10-30mm. S2. The slag particles from the first crushing device enter the spiral classifier for classification. Coarse slag particles with a diameter greater than 30mm enter the jig for jigging and gravity separation through the reverse sand inlet of the spiral classifier. Fine slag particles with a diameter less than 30mm enter the feed trough of the shaking table for screening through the overflow trough of the spiral classifier. S3. The concentrate shaken from the shaking table returns to the concentrate pool in the silo, while the fine tailings and wastewater mixture is discharged into the collection pool of the wastewater treatment device. S4. The heavy concentrate separated from the jig returns to the concentrate pool in the silo, while the light tailings enter the sand washing machine through the tailings inlet. Under the action of the rollers in the sand washing machine, the tailings tumble and grind against each other, removing impurities covering the surface of the slag particles. At the same time, the water vapor layer covering the slag particles is destroyed to facilitate dehydration. By adding water, a strong water flow is generated, which carries away impurities and foreign objects with a small specific gravity, thus completing the washing process. After the washing is completed, the coarse slag is transferred back to the temporary storage pool in the silo to wait for the second crushing, while the mixture of light and fine slag and sand washing wastewater is discharged into the collection pool. S5. After the wastewater mixture in the collection tank enters the sedimentation tank, the sediment at the bottom is pumped to the filter press to filter out the water. The filtered water is recycled back to the collection tank, and the dry sand is sold externally.

7. The method for treating dry slag using the ferromanganese alloy dry slag treatment system as described in claim 6, characterized in that, In step S4, the light tailings after jigging gravity separation flow through the tailings outlet on one side of the jigging machine to the lower sorting mechanism for magnetic separation. The magnetically separated concentrate returns to the concentrate pool in the silo or the temporary storage pool in the silo, while the magnetically separated coarse tailings enter the sand washing machine. During magnetic separation, the tailings after jigging gravity separation flow down from the tailings outlet and wash the magnetic separator wheel of the sorting mechanism, causing it to rotate. This, in turn, drives the generator to rotate and generate electricity. The electrical energy generated by the generator is stored in the battery and supplies power to the bar electromagnet through the conductive slip ring. When the bar electromagnet is energized, it attracts the magnetic concentrate, while the non-magnetic tailings fall into the tailings area below. After the magnetic concentrate rotates to the top of the concentrate area with the bar electromagnet, the bar electromagnet is de-energized, allowing the magnetic concentrate to fall into the concentrate area, thus completing the magnetic separation.

8. The method for treating dry slag using the manganese-ferroalloy dry slag treatment system as described in claim 7, characterized in that, As the magnetic concentrate rotates above the concentrate area with the bar electromagnet, the brush bristles, corresponding to the bar electromagnet, continuously brush off the residual magnetic concentrate adsorbed on the bar electromagnet.

Images