High-zinc blast furnace cloth bag dedusting ash treatment system and treatment method thereof

Abstract

The invention discloses a high-zinc blast furnace cloth bag dedusting ash treatment system and a treatment method thereof. The system comprises a stirring pool, a stirring assembly, a slurry pumping pipe, a slurry pumping pump, a conveying pipe, a first-stage slurry mixing tank, a first-stage washing filter press, a raw material room digestion material pool and a rotary hearth furnace. The stirring tank is of a cylinder structure formed by pouring cement downwards from the ground, and a stirring assembly is arranged in the stirring tank; the lower end of the slurry pumping pipe vertically and downwards extends to the middle lower position of the stirring pool along one side wall of the stirring pool, and the upper end of the slurry pumping pipe vertically and upwards extends out of the stirring pool and is communicated with a feeding opening of the primary slurry mixing tank through a slurry pumping pump via a conveying pipe; a discharge port of the first-stage size mixing tank is communicated with a feed port of the first-stage washing filter press, a discharge port of the first-stage washing filter press is used for conveying a filter cake to a raw material room digestion material pool through a belt for landing digestion balling, and the filter cake is conveyed to a rotary hearth furnace for dezincification after digestion balling. Through pulpifying and washing treatment of the stirring pool, harmful elements are prevented from directly entering the blast furnace burden.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace production, and particularly relates to a treatment system and a treatment method for blast furnace bag dust containing high zinc content. Background Art

[0002] The blast furnace bag dust contains certain components such as zinc, lead, calcium, magnesium, sulfate radical, etc. During the rinsing process, a part of zinc, lead, calcium, magnesium, and sulfate radical will be eluted and dissolved in the rinsing water along with the elution of potassium chloride and sodium chloride. During the evaporation and crystallization process, these components will also be concentrated and enriched, and affect the purity of the salt as they precipitate with the crystalline salt; secondly, calcium, magnesium and other ions are prone to scale on the wall of the heat exchange tube during the evaporation process, thus affecting the evaporation operation conditions; in addition, sulfate radical, fluoride ion, etc. have a certain corrosive effect on the evaporator body. Therefore, it is necessary to purify and remove impurities from the rinsing water. The principle of impurity removal is mainly to use chemical precipitation, flocculation precipitation, and adsorption. The medicament reacts with impurity ions to form precipitates (hydroxide precipitate, carbonate precipitate, sulfide precipitate), and the adsorbent adsorbs the impurities, so as to achieve the purpose of removing impurities from the rinsing water.

[0003] (1) Bag dust feeding: The bag dust is transported to the vicinity of the bag dust bin by a suction and discharge vehicle. The nitrogen buffer tank is connected to the suction and discharge vehicle, and the bag dust is transported to the bag dust bin by pneumatic conveying. The top of the bag dust bin is provided with a baghouse dust collector for collecting the dust generated during feeding.

[0004] (2) Primary pulping and pressure filtration of bag dust: The bag dust enters the spiral metering conveyor through a star-shaped ash discharge valve, and is transported to the primary bag dust pulping tank after metering; the water in the primary bag dust filtrate tank and the secondary bag dust filtrate tank is returned to the primary pulping tank as pulping water; the sodium hydroxide solution is added to the primary bag dust pulping tank through a sodium hydroxide feeding pump. The primary bag dust slurry stays in the primary bag dust pulping tank for about 8 minutes, and enters the bag dust buffer pulping tank by overflow. Start stirring and introduce steam to fully dissolve the materials, and then transport them to the primary bag dust water washing and pressure filter by the primary bag dust slurry pump for pressure filtration. The filter cake is collected by the primary bag dust filter cake discharge hopper and directly falls into the secondary bag dust pulping tank for secondary pulping. Start stirring and introduce steam to fully dissolve the materials, and add evaporation condensate for water replenishment; the filtrate enters the primary bag dust filtrate tank. Part of the filtrate is transported to the rinsing water buffer pool by the primary bag dust filtrate pump, and the other part of the filtrate is transported back to the primary bag dust pulping tank.

[0005] (3)Secondary Slurry Mixing and Pressure Filtration of Cloth Bag Ash: The secondary slurry of cloth bag ash is transported by the secondary slurry pump of cloth bag ash to the secondary water washing and pressure filter of cloth bag ash for pressure filtration; the filter cake (with chloride ion concentration below 1% and moisture content below 22%) is transported by the secondary filter cake conveyor belt of cloth bag ash to the filter cake transfer belt of cloth bag ash, and then transferred to the rotary hearth furnace blast furnace sludge bin through the cloth bag ash gallery belt I and cloth bag ash gallery belt II; the filtrate enters the secondary filtrate tank of cloth bag ash and the machine washing filtrate tank. The secondary filtrate of cloth bag ash is transported by the secondary filtrate pump of cloth bag ash to the secondary slurry mixing tank and the primary slurry mixing tank of cloth bag ash; the machine washing filtrate is transported by the machine washing filtrate pump to the secondary slurry mixing tank of cloth bag ash.

[0006] During the normal production of the blast furnace, with the change of seasons, the temperature will change greatly, and the temperature difference between day and night is large. Affected by factors such as low winter temperature and crystal water generated in the gas, the temperature difference between the blast furnace gas downcomer and dry dust removal (cloth bag dust removal) increases, which is likely to cause ash blockage in the dry process pipeline. In severe cases, it will affect normal production, and the dust removal ash cannot enter the centralized ash bin normally and be sent to the water washing and salt separation treatment by the suction and discharge tanker. To ensure the normal operation of the blast furnace cloth bag dust removal, operators need to clean the ash accumulated in the pipeline. The ash cleaned from the pipeline directly enters the next process without water washing and salt separation treatment, resulting in excessive harmful elements such as potassium, sodium, and zinc in the blast furnace raw materials, thus having a greater impact on the long-term stable operation of the blast furnace production. Therefore, how to treat the cloth bag dust removal ash of the high-zinc blast furnace to lay a foundation for the stable operation of the blast furnace production has become a difficult problem that needs to be solved urgently. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a treatment system and method for cloth bag dust removal ash of a high-zinc blast furnace. Through the slurry washing treatment in the stirring tank, the harmful elements in the cloth bag dust removal ash and sintering machine head ash are prevented from directly entering the blast furnace burden, thus laying a foundation for the long-term stable operation of the blast furnace production.

[0008] To solve the above technical problems, the present invention adopts the following technical solutions: A high-zinc blast furnace bag dust treatment system of the present invention is characterized in that it includes a stirring tank, a stirring component, a slurry suction pipe, a slurry suction pump, a conveying pipe, a primary slurry adjusting tank, a primary water washing and pressure filter, a digestion material tank in the raw material room, and a rotary hearth furnace; the stirring tank is a cylindrical structure formed by pouring cement downward from the ground, and its upper surface is open, and a stirring component is also provided inside it, so as to slurry the dust removal ash and water in the stirring tank through the stirring component; the lower end of the slurry suction pipe extends vertically downward along one side wall of the stirring tank to a position slightly below the middle of the stirring tank, and its upper end extends vertically upward out of the stirring tank, and is connected to the feed port of the primary slurry adjusting tank through the slurry suction pump and the conveying pipe, so as to pump the slurried slurry into the primary slurry adjusting tank for full dissolution by stirring; the discharge port of the primary slurry adjusting tank is connected to the feed port of the primary water washing and pressure filter through a pipeline, and the fully dissolved solution is sent to the primary water washing and pressure filter for solid-liquid separation; the discharge port of the primary water washing and pressure filter sends the filter cake to the digestion material tank in the raw material room for on-site digestion and pelletizing, and after digestion and pelletizing, it is sent to the rotary hearth furnace for dezincification.

[0009] Preferably, it further includes a water pipe, a check valve I and a check valve II; the depth of the stirring tank is 2800 mm, and its diameter is 1800 mm; the power of the slurry suction pump is 10 KW, and it is installed on the ground on the right side of the stirring tank, and it is necessary to ensure that the slurry suction pipe does not interfere with the operation of the stirring component; the lower end of the water pipe extends vertically downward along the other side wall of the stirring tank to a position slightly above the middle of the stirring tank, and its upper end extends vertically upward out of the stirring tank and is connected to a water source, so as to send water into the stirring tank, and a check valve I is also connected to the water pipe; the wall thickness of the conveying pipe is 8 mm, and its diameter is 80 mm; a check valve II is also connected to the conveying pipe, and the distance between the check valve II and the slurry suction pump is 300 mm.

[0010] Preferably, the stirring assembly includes a bracket, a stirring motor, a stirring shaft, a fixed base and a stirring blade; a bracket is also horizontally fixedly provided in the middle position of the upper surface of the stirring pool, and both ends of the bracket are fixedly installed on the ground relative to the left and right sides of the stirring pool, and are respectively arranged without interfering with the water pipe, the slurry suction pipe and the slurry suction pump, and the upper surface of the stirring pool is divided into two fan-shaped feed inlets front and back by the bracket; a rotating shaft is also vertically provided on the inner bottom surface of the stirring pool relative to the center position of the bracket, and the lower end of the rotating shaft is connected to the inner bottom surface of the stirring pool for rotation around its own axial direction; a stirring motor is also vertically provided in the middle position of the upper surface of the bracket, and the output end of the stirring motor extends vertically downward into the stirring pool, and is connected to the inner bottom surface of the stirring pool by a coupling. The device is coaxially linked with the upper end of the stirring rod, and the lower end of the stirring rod is coaxially screwed and fixed with the upper end of the rotating shaft through a flange, so that the stirring rod rotates around its own axis under the drive of the stirring motor; three stirring layers are sequentially arranged from top to bottom in the lower middle position of the outer circumferential surface of the stirring rod, and a plurality of stirring blades are evenly distributed and inclined along the circumferential direction in each stirring layer, each of the stirring blades is inclined and parallel, and its fixed end is fixedly connected to the stirring rod through a fixed base, and the other end is arranged without interfering with the stirring pool, so that the stirring blade rotates with the stirring rod under the drive of the stirring motor, and the dust removal ash and water in the stirring pool are stirred and slurried.

[0011] Preferably, the power of the stirring motor is 5KW, and its rotation speed is 80r / min; the spacing between adjacent stirring blades is 600mm, and its stirring diameter is 800mm~900mm, and the spacing between the bottom layer of stirring blades and the inner bottom surface of the stirring tank is 250mm.

[0012] Preferably, each of the fixed bases is fixedly installed at a corresponding position on the outer circumferential surface of the stirring rod, and the fixed end of each of the stirring blades is respectively sleeved in the corresponding fixed base and screwed and fixed by bolts, thereby facilitating disassembly and replacement.

[0013] Preferably, it further includes an alkali solution tank, a lime tank, a compressed air tank, a water tank, a water pump and a filtrate tank; the alkali solution tank and the lime tank are respectively communicated with the feeding port of the first-stage slurry mixing tank, and liquid alkali is added into the first-stage slurry mixing tank through the alkali solution tank, and lime is added into the first-stage slurry mixing tank through the lime tank; the compressed air tank is communicated with the air inlet of the first-stage water washing and pressure filtering machine, and compressed air is sent into the first-stage water washing and pressure filtering machine; the water tank is communicated with the water inlet of the first-stage water washing and pressure filtering machine through the water pump, and water is pumped into the first-stage water washing and pressure filtering machine; the liquid discharge port of the first-stage water washing and pressure filtering machine is communicated with the filtrate tank through a pipeline, and the liquid obtained after solid-liquid separation is sent into the filtrate tank for storage; the filter cloth of the first-stage water washing and pressure filtering machine is made of polyester fiber or polyester base cloth, and the adopted specification is 20L / m2·S, so as to realize solid-liquid separation through the filter cloth, obtain filter cake, and ensure that the water content of the filter cake is lower than 16%.

[0014] The treatment method of a high-zinc blast furnace bag dust treatment system of the present invention is characterized in that it includes the following steps: Step 1: First, transport the low-temperature blast furnace bag dust and the dust removed from the blast furnace bag to the ton bag ash, transfer it to the mixing tank through the finished product warehouse crane, and pour it into the mixing tank. During this process, the raised dust is removed by the dust removal device; Step 2: Add water into the mixing tank through the water pipe, and ensure that the water-to-ash ratio is 3:1; Step 3: Then start the mixing motor, and slurry the dust in the mixing tank by rotating the mixing blades; Step 4: Pump the slurried slurry into the first-stage slurry mixing tank through the delivery pipe by the slurry pumping pump, and at the same time add lime and liquid alkali into the first-stage slurry mixing tank; then fully stir and dissolve the slurry, lime and liquid alkali in the first-stage slurry mixing tank until the chloride ion dissolution rate reaches more than 95%; Step 5: Then send the fully stirred and dissolved solution into the first-stage water washing and pressure filtering machine, and perform solid-liquid separation through the filter cloth. Potassium ions, sodium ions and chloride ions dissolve in water to form a liquid and are sent into the filtrate tank for storage, while the obtained filter cake after separation is transported to the digestion material pool in the raw material room by belt for on-site digestion and pelletizing, and after digestion and pelletizing, it is de-zincified by a rotary hearth furnace.

[0015] Preferably, in the above step 3, the slurry treatment time in the mixing tank is 1.5h.

[0016] Preferably, in the above step 4, the full stirring and dissolving time in the first-stage slurry mixing tank is 1.5h - 2h.

[0017] Preferably, in the above step 5, the water content of the filter cake is lower than 16%.

[0018] The beneficial effects of the present invention: (1) Through the pulping and water washing treatment in the agitation tank, the present invention avoids the harmful elements in the bag dust removal ash and sintering machine head ash from directly entering the blast furnace burden, thereby laying a foundation for the long-term stable and smooth operation of blast furnace production; (2) The stirring blades of the present invention adopt an inclined design, which can effectively increase the stirring area and improve the pulping treatment effect; at the same time, the stirring blades and the stirring rods are connected by a screw connection method, which is convenient for disassembling and replacing the stirring blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of a high-zinc blast furnace bag dust removal ash treatment system of the present invention.

[0021] Figure 2 It is a data comparison table of the pulping and water washing treatment and the non-pulping and water washing treatment of the present invention.

[0022] Among them, 1 - water pipe; 2 - check valve I; 3 - agitation tank; 4 - agitation motor; 5 - agitation rod; 6 - stirring blade; 7 - slurry suction pipe; 8 - slurry suction pump; 9 - check valve II; 10 - primary slurry mixing tank; 11 - lye tank; 12 - lime tank; 13 - primary water washing filter press; 14 - water tank; 15 - water pump; 16 - compressed air tank; 17 - filtrate tank; 18 - digestion tank in the raw material storage area; 19 - rotary hearth furnace; 20 - support. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions of the present invention will be clearly and completely described below through specific embodiments.

[0024] A high-zinc blast furnace bag dust removal ash treatment system of the present invention includes an agitation tank 3, an agitation assembly, a slurry suction pipe 7, a slurry suction pump 8, a conveying pipe, a primary slurry mixing tank 10, a primary water washing filter press 13, a digestion tank 18 in the raw material storage area and a rotary hearth furnace 19; the specific structure is as Figure 1As shown in the figure, the stirring tank 3 is a cylindrical structure formed by pouring cement downward from the ground. Its upper surface is open, and a stirring component is provided inside. Then, the dedusting ash and water are slurried in the stirring tank 3 through the stirring component. The lower end of the slurry extraction pipe 7 extends vertically downward along one side wall of the stirring tank 3 to a position slightly below the middle of the stirring tank 3, and its upper end extends vertically upward out of the stirring tank 3 and is connected to the feed inlet of the first-stage slurry mixing tank 10 through a slurry pump 8 via a conveying pipe. Then, the slurried slurry is pumped into the first-stage slurry mixing tank 10 for thorough stirring and dissolution. The discharge outlet of the first-stage slurry mixing tank 10 is connected to the feed inlet of the first-stage water washing and pressure filter 13 through a pipeline, and the fully dissolved solution is sent to the first-stage water washing and pressure filter 13 for solid-liquid separation. The discharge outlet of the first-stage water washing and pressure filter 13 sends the filter cake to the digestion material pool 18 in the raw material room for on-site digestion and pelletization, and after digestion and pelletization, it is sent to the rotary hearth furnace 19 for dezincification.

[0025] As Figure 1 shown in the figure, the depth of the stirring tank 3 is 2800 mm, and its diameter is 1800 mm. The power of the slurry pump 8 is 10 KW, and it is installed on the ground relative to the right side of the stirring tank 3, and it is necessary to ensure that the slurry extraction pipe 7 does not interfere with the operation of the stirring component.

[0026] As Figure 1 shown in the figure, the lower end of the water pipe 1 extends vertically downward along the other side wall of the stirring tank 3 to a position slightly above the middle of the stirring tank 3, and its upper end extends vertically upward out of the stirring tank 3 and is connected to a water source. Then, water is sent into the stirring tank 3, and a check valve I 2 is also connected to the water pipe 1.

[0027] As Figure 1 shown in the figure, the wall thickness of the conveying pipe is 8 mm, and its diameter is 80 mm. A check valve II 9 is also connected to the conveying pipe, and the distance between the check valve II 9 and the slurry pump 8 is 300 mm.

[0028] The stirring component of the present invention includes a bracket 20, a stirring motor 4, a coupling, a stirring shaft, a fixed base, and stirring blades 6; As Figure 1As shown in the figure, a support 20 is horizontally and fixedly arranged at the middle position of the upper surface of the stirring tank 3. The two ends of the support 20 are fixedly installed on the ground on the left and right sides of the stirring tank 3, and are respectively arranged without interference with the water pipe 1, the slurry pumping pipe 7 and the slurry pump 8. The upper surface of the stirring tank 3 is divided into two fan-shaped feeding ports before and after by the support 20; a rotating shaft is vertically arranged at the middle position of the inner bottom surface of the stirring tank 3 relative to the center of the support 20, and the lower end of the rotating shaft is rotatably connected to the inner bottom surface of the stirring tank 3 around its own axis; a stirring motor 4 is vertically arranged at the middle position of the upper surface of the support 20. The output end of the stirring motor 4 extends vertically downward into the stirring tank, and is coaxially linked with the upper end of the stirring rod 5 through a coupling. The lower end of the stirring rod 5 is fixedly connected to the upper end of the rotating shaft coaxially through a flange. Thus, driven by the stirring motor 4, the stirring rod 5 rotates around its own axis; among them, the power of the stirring motor 4 is 5KW, and its rotation speed is 80r / min; As Figure 1 shown in the figure, three stirring layers are sequentially arranged at intervals from top to bottom at the middle and lower position of the outer circumferential surface of the stirring rod 5. And several stirring blades 6 are evenly arranged at intervals along the circumferential direction in each stirring layer. Each stirring blade 6 is arranged obliquely and parallelly, and its fixed end is fixedly connected to the stirring rod 5 through a fixed base respectively, and the other end of each of them is arranged without interference with the stirring tank 3. Thus, driven by the stirring motor 4, the stirring blades 6 rotate with the stirring rod 5 to stir and pulp the dust removal ash and water in the stirring tank 3; among them, the distance between adjacent stirring blades 6 is 600mm, and its stirring diameter is 800mm - 900mm, and the distance between the lowermost layer of stirring blades 6 and the inner bottom surface of the stirring tank 3 is 250mm.

[0029] As Figure 1 shown in the figure, each fixed base is fixedly installed at the corresponding position of the outer circumferential surface of the stirring rod 5, and the fixed end of each stirring blade 6 is respectively sleeved in the corresponding fixed base and is fixedly connected by bolts, which is convenient for disassembly and replacement.

[0030] As Figure 1 shown in the figure, the lye tank 11 and the lime tank 12 are respectively communicated with the feeding port of the first-stage slurry mixing tank 10, and lye is added into the first-stage slurry mixing tank 10 through the lye tank 11, and lime is added into the first-stage slurry mixing tank 10 through the lime tank 12.

[0031] As Figure 1As shown in the figure, the compressed air tank 16 is connected to the air inlet of the first-stage water-washing filter press 13, and sends compressed air into the first-stage water-washing filter press 13; the water tank 14 is connected to the water inlet of the first-stage water-washing filter press 13 through the water pump 15, and pumps water into the first-stage water-washing filter press 13; the liquid discharge port of the first-stage water-washing filter press 13 is connected to the filtrate tank 17 through a pipeline, and sends the liquid obtained after solid-liquid separation into the filtrate tank 17 for storage; among them, the filter cloth of the first-stage water-washing filter press 13 is made of polyester fiber or polyester base cloth, and the specification adopted is 20L / m2·S, so as to realize solid-liquid separation through the filter cloth, obtain filter cake, and ensure that the water content of the filter cake is lower than 16%.

[0032] The treatment method of a high-zinc blast furnace bag dust treatment system of the present invention is as Figure 1 、 Figure 2 shown, and includes the following steps: Step 1: First, transport the low-temperature blast furnace bag dust and the dust removed from the blast furnace bag cleaning to the ton bag ash, transfer it to the mixing tank 3 through the finished product warehouse crane, and pour it into the mixing tank 3. During this process, the dust-raising dust is removed by the dust removal device.

[0033] Step 2: Add water into the mixing tank 3 through the water pipe 1, and ensure that the water-to-ash ratio is 3:1.

[0034] Step 3: Then start the mixing motor 4, and carry out pulping treatment on the dust in the mixing tank 3 by the rotation of the mixing blades 6; In the above step, the pulping treatment time in the mixing tank 3 is 1.5h.

[0035] Step 4: Pump the pulped slurry into the first-stage slurry mixing tank 10 through the slurry pumping pump 8 via the conveying pipe, and add lime and liquid caustic soda into the first-stage slurry mixing tank 10 at the same time; then fully stir and dissolve the slurry, lime and liquid caustic soda in the first-stage slurry mixing tank 10 until the chloride ion dissolution rate reaches more than 95%; In the above step, the full stirring and dissolving time in the first-stage slurry mixing tank 10 is 1.5h~2h.

[0036] Step 5: Then send the fully stirred and dissolved solution into the first-stage water-washing filter press 13, carry out solid-liquid separation through the filter cloth, potassium ions, sodium ions and chloride ions dissolve in water to form a liquid and send it into the filtrate tank 17 for storage, and obtain a filter cake with a water content lower than 16% after separation, and transport it to the raw material room digestion material pool 18 for on-site digestion and pelletizing through a belt, and after digestion and pelletizing, carry out dezincing through a rotary hearth furnace 19.

[0037] The effect of removing harmful elements by using the treatment method of the present invention is as Figure 2 shown.

[0038] Advantages of the present invention: (1) Through the pulping and water washing treatment in the stirring tank 3 of the present invention, harmful elements in the bag dust removal ash and sintering machine head ash are prevented from directly entering the blast furnace burden, thus laying a foundation for the long-term stable and smooth operation of blast furnace production; (2) The stirring blade 6 of the present invention adopts an inclined design, which can effectively increase the stirring area and improve the pulping treatment effect; at the same time, the stirring blade 6 and the stirring rod 5 are connected by a screw connection method, which is convenient for disassembling and replacing the stirring blade 6.

[0039] The above-described embodiments are only described as the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various variations and improvements made by ordinary engineering and technical personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A high-zinc blast furnace bag dust removal ash treatment system, characterized in that: The invention comprises a stirring tank, a stirring assembly, a slurry suction pipe, a slurry suction pump, a conveying pipe, a first-level slurry mixing tank, a first-level water-washing filter press, a raw material digestion tank and a rotary furnace; the stirring tank is a cylindrical structure formed by pouring cement from the ground downward, and its upper surface is open, and a stirring assembly is also arranged inside it, and the dust removal ash and water are slurried in the stirring tank through the stirring assembly; the lower end of the slurry suction pipe extends vertically downward along one side wall of the stirring tank to the lower middle position of the stirring tank, and the upper end thereof extends vertically upward out of the stirring tank. The slurry is pumped into the first-level slurry mixing tank and connected to the feed port of the first-level slurry mixing tank through a slurry pump via a conveying pipe, and the slurry after slurry treatment is pumped into the first-level slurry mixing tank for stirring and sufficient dissolution; the discharge port of the first-level slurry mixing tank is connected to the feed port of the first-level water-washing filter press through a pipeline, and the fully dissolved solution is sent to the first-level water-washing filter press for solid-liquid separation; the discharge port of the first-level water-washing filter press sends the filter cake to the digestion pool in the raw material room through a belt for floor digestion and balling, and after digestion and balling, it is sent to the rotary hearth furnace for dezincification.

2. A high-zinc blast furnace bag dust removal ash treatment system according to claim 1, characterized in that: It also includes a water pipe, a check valve I and a check valve II; the depth of the stirring tank is 2800mm, and its diameter is 1800mm; the power of the slurry pump is 10KW, and it is installed on the ground relative to the right side of the stirring tank, and it is necessary to ensure that the slurry pipe does not interfere with the movement of the stirring assembly; the lower end of the water pipe extends vertically downward along the other side wall of the stirring tank to the middle and upper position of the stirring tank, and its upper end extends vertically upward out of the stirring tank and is connected with a water source, thereby delivering water to the stirring tank, and a check valve I is also connected to the water pipe; the wall thickness of the delivery pipe is 8mm, and its diameter is 80mm; a check valve II is also connected to the delivery pipe, and the distance between the check valve II and the slurry pump is 300mm.

3. A high-zinc blast furnace bag dust removal ash treatment system according to claim 2, characterized in that: The stirring assembly includes a bracket, a stirring motor, a stirring shaft, a fixed base and a stirring blade; a bracket is also fixedly provided horizontally in the middle position of the upper surface of the stirring pool, and the two ends of the bracket are fixedly installed on the ground relative to the left and right sides of the stirring pool, and are respectively arranged without interfering with the water pipe, the slurry suction pipe and the slurry suction pump, and the upper surface of the stirring pool is divided into two fan-shaped feed inlets front and back by the bracket; a rotating shaft is also vertically provided on the inner bottom surface of the stirring pool relative to the center position of the bracket, and the lower end of the rotating shaft is connected to the inner bottom surface of the stirring pool around its own axial rotation; a stirring motor is also vertically provided in the middle position of the upper surface of the bracket, and the output end of the stirring motor extends vertically downward into the stirring pool, and is connected to the stirring pool through a coupling The upper end of the stirring rod is coaxially linked, and the lower end of the stirring rod is coaxially screwed and fixed with the upper end of the rotating shaft through a flange, so that under the drive of the stirring motor, the stirring rod rotates around its own axis; three stirring layers are sequentially arranged from top to bottom in the lower middle position of the outer circumferential surface of the stirring rod, and in each stirring layer, a plurality of stirring blades are evenly distributed and inclined along the circumferential direction, each of the stirring blades is inclined and parallel, and its fixed end is fixedly connected to the stirring rod through a fixed base, and the other end is arranged without interfering with the stirring pool, so that under the drive of the stirring motor, the stirring blade rotates with the stirring rod to stir the dust removal ash and water in the stirring pool into a slurry.

4. A high-zinc blast furnace bag dust removal ash treatment system according to claim 3, characterized in that: The power of the stirring motor is 5KW, and its rotation speed is 80r / min; the spacing between adjacent stirring blades is 600mm, and its stirring diameter is 800mm~900mm, and the spacing between the bottom layer of stirring blades and the inner bottom surface of the stirring tank is 250mm.

5. A high-zinc blast furnace bag dust removal ash treatment system according to claim 3, characterized in that: Each of the fixed bases is fixedly installed at a corresponding position on the outer circumferential surface of the stirring rod, and the fixed end of each of the stirring blades is respectively sleeved in the corresponding fixed base and screwed and fixed by bolts, so as to facilitate disassembly and replacement.

6. A high-zinc blast furnace bag dust removal ash treatment system according to claim 3, characterized in that: It also includes an alkali liquid tank, a lime tank, a compressed air tank, a water tank, a water pump and a filtrate tank; the alkali liquid tank and the lime tank are respectively connected to the feeding port of the first-level slurry mixing tank, and liquid alkali is added to the first-level slurry mixing tank through the alkali liquid tank, and lime is added to the first-level slurry mixing tank through the lime tank; the compressed air tank is connected to the air inlet of the first-level water-washing filter press, and compressed air is sent to the first-level water-washing filter press; the water tank is connected to the water inlet of the first-level water-washing filter press through the water pump, and water is pumped into the first-level water-washing filter press; the discharge port of the first-level water-washing filter press is connected to the filtrate tank through a pipeline, and the liquid obtained after solid-liquid separation is sent to the filtrate tank for storage; the filter cloth of the first-level water-washing filter press is made of polyester fiber or polyester base cloth, and the specification adopted is 20L / m2·S, and then solid-liquid separation is achieved through the filter cloth to obtain a filter cake, and the water content of the filter cake is ensured to be less than 16%.

7. The method for treating a high-zinc blast furnace bag dust treatment system according to claim 6 is characterized in that The following steps are involved: Step 1: First, transport the blast furnace low-temperature blast furnace bag ash and the dust-removed ash from the blast furnace bag cleaning to the mixing tank through the finished product warehouse crane, and dump it into the mixing tank. In this process, the dust raised is removed by the dust removal device; Step 2: Add water to the mixing tank through the water pipe and ensure that the water-cement ratio is 3:1; Step 3: Then start the stirring motor and slurry the dust in the stirring tank through the rotation of the stirring blades; Step 4: The slurry after slurry treatment is pumped into the primary slurry mixing tank through the conveying pipe by a slurry pump, and lime and liquid alkali are added to the primary slurry mixing tank at the same time; then the slurry, lime and liquid alkali are fully stirred and dissolved in the primary slurry mixing tank until the chloride ion dissolution rate reaches more than 95%; Step 5: The fully stirred and dissolved solution is then sent to the primary water-wash filter press, where solid-liquid separation is performed through the filter cloth. Potassium ions, sodium ions and chloride ions are dissolved in water to form liquid and sent to the filtrate tank for storage. The filter cake obtained after separation is transported by belt to the digestion pool in the raw material room for floor digestion and ball making. After digestion and ball making, it is dezincified through a rotary hearth furnace.

8. The method for treating a high-zinc blast furnace bag dust treatment system according to claim 7, characterized in that: In the above step 3, the slurry treatment time in the stirring tank is 1.5 hours.

9. The method for treating a high-zinc blast furnace bag dust treatment system according to claim 7, characterized in that: In the above step 4, the sufficient stirring and dissolving time in the first-level slurry mixing tank is 1.5h~2h.

10. The method for treating a high-zinc blast furnace bag dust treatment system according to claim 7, characterized in that: In the above step 5, the water content of the filter cake is less than 16%.

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