A device for increasing the content of rhenium in white smoke dust
By installing atomizing spray guns in the rhenium adsorption tower and spray cooling tower, and utilizing the secondary cooling adsorption effect, the problem of low rhenium recovery rate in white smoke dust was solved, and efficient recovery of rhenium in white smoke dust was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 国投金城冶金有限责任公司
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-29
AI Technical Summary
In existing technologies, the distribution rate of rhenium in white dust is low, and traditional processes cannot effectively recover rhenium from white dust, resulting in the loss of rhenium resources and low recovery rate.
A rhenium adsorption tower is added after the waste heat boiler of smelting, and a spray cooling tower is added after the electrostatic precipitator of smelting. Atomizing spray guns are installed in the rhenium adsorption tower and the spray cooling tower to improve the rhenium recovery efficiency through secondary cooling adsorption.
It significantly increased the rhenium content in white smoke dust from 10% to 80%, solving the problem of rhenium resource loss and improving the rhenium recovery rate.
Smart Images
Figure CN224292918U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of non-ferrous metal smelting technology, specifically relating to a device for increasing the rhenium content in white smoke dust, a byproduct of gold and copper smelting. In particular, by adding equipment such as rhenium adsorption towers, spray cooling towers, and atomizing spray guns, it can precisely control the temperature, pressure, and other related process parameters of the smelting flue gas treatment system, optimize leaching process parameters and equipment structure, and improve the distribution rate of rhenium in white smoke dust, thereby increasing the rhenium content in white smoke dust. Background Technology
[0002] Rhenium is a scarce, high-melting-point metal widely used in aerospace, electronics, and catalysis. Globally, rhenium resources are primarily found in molybdenum and copper deposits, with extremely low concentrations, typically only 0.001%–0.005%. In the non-ferrous metal gold and copper smelting process, rhenium is mainly concentrated in byproducts such as white smoke dust, crude arsenic trioxide, purified dilute acid, purified acid sludge, and arsenic sulfide slag.
[0003] Currently, rhenium extraction processes include oxidative roasting-precipitation, wet extraction, solvent extraction, and ion exchange. The oxidative roasting-precipitation method involves washing and wet electrostatic precipitator-treated flue gas containing Ro₂O₇ to form high-rhenic acid, which is then concentrated and separated to recover rhenium. Traditional rhenium recovery processes have the following problems: 1. They can only recover rhenium from purified dilute acid, not from white flue dust. 2. The rhenium content in white flue dust is relatively low. 3. Rhenium in crude arsenic trioxide, purified acid sludge, and sulfide slag cannot be recovered, resulting in a lower overall rhenium recovery rate and resource loss. Utility Model Content
[0004] Based on the technical problems existing in the prior art, this utility model proposes a device to increase the rhenium content in white smoke dust. By adding a rhenium adsorption tower after the waste heat boiler of smelting and a spray cooling tower after the electrostatic precipitator of smelting, and installing atomizing spray guns in the rhenium adsorption tower and the spray cooling tower, the secondary cooling adsorption effect is utilized to improve the rhenium recovery efficiency.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A device for increasing the rhenium content in white smoke dust includes a smelting furnace, a smelting waste heat boiler, a rhenium adsorption tower, a rhenium adsorbent tank, a smelting electrostatic precipitator, a spray cooling tower, a reagent tank, a bag filter for arsenic collection, and a flue gas exhaust manifold.
[0007] The top of the smelting furnace is equipped with a smelting furnace direct flue, which is connected to the air inlet of the smelting waste heat boiler through a membrane wall;
[0008] The outlet of the smelting waste heat boiler is connected to the inlet of the rhenium adsorption tower via a pipeline.
[0009] The outlet of the rhenium adsorption tower is connected to the inlet of the electrostatic precipitator for smelting via a pipeline;
[0010] The top of the rhenium adsorption tower is also equipped with an adsorbent inlet, and a first atomizing spray gun is inserted into the adsorbent inlet. The rhenium adsorbent tank is connected to the feed end of the first atomizing spray gun through a pipeline.
[0011] The upper part of the electrostatic precipitator for smelting is provided with an exhaust end, and the exhaust end of the electrostatic precipitator for smelting has two branches, namely the first branch and the second branch.
[0012] The first branch is connected to the air inlet of the spray cooling tower; the air outlet of the spray cooling tower is connected to the air inlet of the bag filter arsenic collector through a pipeline; the air outlet of the bag filter arsenic collector is connected to the inlet of the flue gas exhaust main through a pipeline; and the second branch is connected to the inlet of the flue gas exhaust main.
[0013] The top of the spray cooling tower is also equipped with a chemical inlet, into which a second atomizing spray gun is inserted. The chemical tank is connected to the feed end of the second atomizing spray gun through a pipeline.
[0014] Furthermore, the device for increasing the rhenium content in white smoke dust also includes a scraper conveyor buried in the smelting waste heat boiler.
[0015] Furthermore, the discharge end at the bottom of the smelting waste heat boiler is connected to the feed end of the smelting waste heat boiler submerged scraper conveyor through a first discharge pipe with a rigid expansion joint.
[0016] Furthermore, the device for increasing the rhenium content in white smoke dust also includes a rhenium adsorption tower scraper conveyor and a rhenium adsorption tower ash silo.
[0017] Furthermore, the discharge end at the bottom of the rhenium adsorption tower is connected to the feed end of the rhenium adsorption tower buried scraper conveyor through a second discharge pipe with a rigid expansion joint; the discharge end of the rhenium adsorption tower buried scraper conveyor is connected to the feed end of the rhenium adsorption tower ash silo through a pipeline; and the discharge end at the bottom of the rhenium adsorption tower ash silo is discharged externally through a pipeline.
[0018] Furthermore, a rhenium adsorbent delivery pump is installed on the pipeline connecting the rhenium adsorbent tank and the first atomizing spray gun.
[0019] Furthermore, the device for increasing the rhenium content in white smoke dust also includes an electrostatic precipitator with a scraper conveyor and a white smoke dust silo.
[0020] Furthermore, the discharge end of the bottom of the electrostatic precipitator is connected to the feed end of the buried scraper conveyor of the electrostatic precipitator through a third discharge pipe with a rigid expansion joint; the discharge end of the buried scraper conveyor of the electrostatic precipitator is connected to the feed end of the white dust silo through a pipeline, and the discharge end of the bottom of the white dust silo is discharged externally through a pipeline.
[0021] Furthermore, the device for increasing the rhenium content in white smoke dust also includes a cooling tower scraper conveyor and a cooling tower ash silo.
[0022] Furthermore, the discharge end at the bottom of the spray cooling tower is connected to the feed end of the cooling tower buried scraper conveyor through a fourth discharge pipe with a rigid expansion joint; the discharge end of the cooling tower buried scraper conveyor is connected to the feed end of the cooling tower ash silo through a pipeline, and the discharge end at the bottom of the cooling tower ash silo is discharged externally through a pipeline.
[0023] Furthermore, the device for increasing the rhenium content in white smoke dust also includes an arsenic collector with a scraper conveyor and a coarse arsenic ash silo.
[0024] Furthermore, the discharge end of the bag filter arsenic collector is connected to the feed end of the arsenic collector's buried scraper conveyor through a fifth discharge pipe with a rigid expansion joint. The discharge end of the arsenic collector's buried scraper conveyor is connected to the feed end of the coarse arsenic ash silo through a pipeline. The discharge end of the coarse arsenic ash silo at the bottom is discharged externally through a pipeline.
[0025] Furthermore, a high-temperature fan is installed on the flue gas exhaust main.
[0026] Furthermore, a drug delivery pump is installed on the pipeline connecting the drug tank and the second atomizing spray gun.
[0027] Furthermore, a first control valve is installed on the first branch, and a second control valve is installed on the second branch.
[0028] Compared with the prior art, the beneficial effects of this utility model are:
[0029] 1. This utility model improves the rhenium extraction process in the prior art by adding a rhenium adsorption tower after the waste heat boiler of smelting and a spray cooling tower after the electrostatic precipitator of smelting, and installing atomizing spray guns in the rhenium adsorption tower and the spray cooling tower, thereby improving the rhenium recovery efficiency by utilizing the secondary cooling adsorption effect.
[0030] 2. This utility model can solve the problems of low rhenium recovery rate, large amount of rhenium element cannot be recovered, low total rhenium element recovery rate, and large loss of rhenium resources in traditional processes.
[0031] 3. This invention adds a rhenium adsorption tower to the traditional smelting system. Atomized rhenium adsorbent is sprayed into the tower, and the outlet flue gas temperature is adjusted by controlling the spray volume. This causes the adsorbed rhenium to adhere to the white dust, directionally adsorbing the rhenium element into the white dust, which is then discharged from the electrostatic precipitator. After adding the rhenium adsorption tower, the proportion of rhenium in the white dust increases from 10% to 80%, significantly increasing the rhenium content in the white dust. Attached Figure Description
[0032] Figure 1This is a schematic diagram of the device for increasing the rhenium content in white smoke dust as described in Example 1. Detailed Implementation
[0033] To facilitate understanding of this utility model, the following description will be provided in more comprehensive and detailed manner with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.
[0034] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.
[0035] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.
[0036] Example 1
[0037] like Figure 1 As shown, an apparatus for increasing the rhenium content in white smoke dust includes a smelting furnace (1-1), a smelting waste heat boiler (1-3), a smelting waste heat boiler submerged scraper conveyor (1-4), a rhenium adsorption tower (2-1), a rhenium adsorption tower submerged scraper conveyor (2-2), a rhenium adsorption tower ash silo (2-3), a rhenium adsorbent tank (2-4), a smelting electrostatic precipitator (3-1), an electrostatic precipitator submerged scraper conveyor (3-2), a white smoke dust ash silo (3-3), a spray cooling tower (4-1), a cooling tower submerged scraper conveyor (4-2), a cooling tower ash silo (4-3), a reagent tank (4-4), and a bag filter arsenic collector (5-1) (specification F=7). The 000m³ baghouse arsenic collector adopts a conventional model in the existing technology, and its structure is not the point of invention of this utility model, so it will not be described in detail. The flue gas at the outlet of the smelting electrostatic precipitator (3-1) of about 300°C is cooled to 150°C through the spray cooling tower (4-1). Arsenic trioxide is precipitated from the gaseous state to form particles. Then the flue gas containing solid arsenic trioxide particles enters the lower gas chamber of the baghouse arsenic collector (5-1), passes through the filter bag, and the solid particles are filtered and intercepted on the surface of the filter bag. The arsenic is recovered through back-blowing and scraper conveyor (5-2), coarse arsenic ash bin (5-3), and flue gas exhaust manifold (6-1).
[0038] The top of the smelting furnace (1-1) is equipped with a smelting furnace direct-rise flue (1-2) for discharging high-temperature rhenium-containing flue gas from the smelting furnace (1-1). The smelting furnace direct-rise flue (1-2) is connected to the air inlet of the smelting waste heat boiler (1-3) through a pipeline.
[0039] The upper outlet of the smelting waste heat boiler (1-3) is connected to the upper inlet of the rhenium adsorption tower (2-1) through a pipeline; the lower outlet of the smelting waste heat boiler (1-3) is connected to the feed end of the smelting waste heat boiler buried scraper conveyor (1-4) through the first discharge pipe with a rigid expansion joint (not shown in the figure).
[0040] The discharge end of the rhenium adsorption tower (2-1) is connected to the feed end of the rhenium adsorption tower buried scraper conveyor (2-2) through a second discharge pipe with a rigid expansion joint (not shown in the figure). The discharge end of the rhenium adsorption tower buried scraper conveyor (2-2) is connected to the feed end of the rhenium adsorption tower ash silo (2-3) through a pipeline. The discharge end of the rhenium adsorption tower ash silo (2-3) at the bottom is discharged externally through a pipeline.
[0041] The outlet at the bottom of the rhenium adsorption tower (2-1) is also connected to the inlet of the smelting electrostatic precipitator (3-1) via a pipeline;
[0042] The top of the rhenium adsorption tower (2-1) is also provided with an adsorbent inlet, and a first atomizing spray gun (2-6) is inserted into the adsorbent inlet. The rhenium adsorbent tank (2-4) is connected to the feed end of the first atomizing spray gun (2-6) through a pipeline. A rhenium adsorbent delivery pump (2-5) is provided on the pipeline connecting the rhenium adsorbent tank (2-4) and the first atomizing spray gun (2-6).
[0043] The discharge end of the smelting electrostatic precipitator (3-1) is connected to the feed end of the electrostatic precipitator buried scraper conveyor (3-2) through a third discharge pipe with a rigid expansion joint (not shown in the figure); the discharge end of the electrostatic precipitator buried scraper conveyor (3-2) is connected to the feed end of the white dust silo (3-3) through a pipeline; the discharge end of the white dust silo (3-3) at the bottom is discharged externally through a pipeline.
[0044] The upper part of the electrostatic precipitator (3-1) for smelting is provided with an exhaust end, and the exhaust end of the electrostatic precipitator (3-1) for smelting is provided with two branches, namely the first branch and the second branch.
[0045] The first branch is connected to the air inlet at the top of the spray cooling tower (4-1). The discharge end at the bottom of the spray cooling tower (4-1) is connected to the inlet of the cooling tower buried scraper conveyor (4-2) through the fourth discharge pipe with a rigid expansion joint (not shown in the figure). The discharge end of the cooling tower buried scraper conveyor (4-2) is connected to the inlet of the cooling tower ash silo (4-3) through a pipeline. The discharge end at the bottom of the cooling tower ash silo (4-3) is discharged externally through a pipeline.
[0046] The air outlet at the bottom of the spray cooling tower (4-1) is connected to the air inlet of the bag arsenic collector (5-1) through a pipeline. The discharge end at the bottom of the bag arsenic collector (5-1) is connected to the feed end of the arsenic collector buried scraper conveyor (5-2) through a fifth discharge pipe with a rigid expansion joint (not shown in the figure). The discharge end of the arsenic collector buried scraper conveyor (5-2) is connected to the feed end of the coarse arsenic ash silo (5-3) through a pipeline. The discharge end at the bottom of the coarse arsenic ash silo (5-3) is discharged externally through a pipeline.
[0047] The upper outlet of the bag filter (5-1) is connected to the inlet of the flue gas exhaust main (6-1) through a pipeline. A high-temperature fan (5-4) is installed on the flue gas exhaust main (6-1), and the second branch is connected to the inlet of the flue gas exhaust main (6-1).
[0048] The top of the spray cooling tower (4-1) is also provided with a chemical inlet, and a second atomizing spray gun (4-6) is inserted into the chemical inlet. The chemical tank (4-4) is connected to the feed end of the second atomizing spray gun (4-6) through a pipeline. A chemical delivery pump (4-5) is provided on the pipeline connecting the chemical tank (4-4) and the second atomizing spray gun (4-6).
[0049] Preferably, the first branch is equipped with a first control valve (not shown in the figure), and the second branch is equipped with a second control valve (not shown in the figure). The first and second control valves can be conventional manual valves, and their structure is not the focus of this invention, so they will not be described further.
[0050] The operating mode of this utility model is as follows:
[0051] 1. The high-temperature flue gas generated by the smelting furnace (1-1) (the smelting furnace generates high-temperature flue gas of about 900℃~1000℃ during the production process, the main components of which are sulfur dioxide, sulfur trioxide, nitrogen oxides, particulate matter, heavy metal vapors such as gold, silver, copper, and lead and their compounds) is discharged from the smelting furnace direct flue (1-2) and enters the smelting waste heat boiler (1-3). After being cooled by the smelting waste heat boiler (1-3), the high-temperature flue gas of about 400℃ enters the rhenium adsorption tower (2-1). When the high-temperature flue gas passes through the smelting waste heat boiler (1-3), the boiler ash containing heavy metals such as gold, silver, copper, and lead that accumulates is discharged from the smelting waste heat boiler (1-3) to the smelting waste heat boiler buried scraper conveyor (1-4), and then discharged externally.
[0052] 2. Turn on the rhenium adsorbent delivery pump (2-5) to pump the prepared rhenium adsorbent (mainly composed of alkaline adsorbents such as calcium hydroxide with a concentration of 1%-10%) from the rhenium adsorbent tank (2-4) into the first atomizing spray gun (2-6). After being atomized by the first atomizing spray gun (2-6), it is sprayed into the rhenium adsorption tower (2-1). The rhenium adsorbent, after oxidation, comes into contact with the flue gas. (During copper smelting, rhenium volatilizes into the flue gas as rhenium heptaoxide (Re2O7). In the rhenium adsorption tower (2-1), the alkaline rhenium adsorbent cools the flue gas and absorbs sulfur trioxide to generate calcium sulfate (Ca(OH)2+SO3=CaSO4+H2O). The cooled flue gas causes the gaseous rhenium heptaoxide to condense and adhere to the white dust along with the calcium sulfate.) Part of the calcium sulfate generated in the rhenium adsorption tower (2-1) enters the smelting electrostatic precipitator (3-1) through the flue gas pipeline along with the white dust, while the other part accumulates at the bottom of the rhenium adsorption tower and is discharged through the bottom of the rhenium adsorption tower (2-1) to the rhenium adsorption tower submerged scraper conveyor (2-2) and then enters the rhenium adsorption tower ash silo (2-3).
[0053] The amount of rhenium adsorbent delivered is adjusted by regulating the size of the rhenium adsorption pump (2-5), and the flue gas temperature at the outlet of the rhenium adsorption tower (2-1) is controlled at 260℃-300℃. The flue gas is then sent into the smelting electrostatic precipitator (3-1). At this time, the condensed rhenium heptaoxide enters the smelting electrostatic precipitator (3-1) with the flue gas and is enriched in the white dust. Then, the rhenium adsorbent in the smelting electrostatic precipitator (3-1) is adsorbed and adheres to the white dust and is produced. At the same time, the white dust containing rhenium heptaoxide is discharged from the bottom of the smelting electrostatic precipitator (3-1) to the electrostatic precipitator buried scraper conveyor (3-2) and then enters the white dust ash silo (3-2).
[0054] 3. After the flue gas is discharged from the electrostatic precipitator (3-1), the first control valve is opened and the second control valve is closed. The flue gas enters the spray cooling tower (4-1). The agent delivery pump (4-5) is turned on. The agent in the agent tank (4-4) (mainly calcium hydroxide with a concentration of about 1%-10%) is pumped into the second atomizing spray gun (4-6) through the agent delivery pump (4-5). The agent is then sprayed into the spray cooling tower (4-1) through the second atomizing spray gun (4-6). The agent atomized by the second atomizing spray gun (4-6) comes into contact with the flue gas, cools the flue gas a second time, and absorbs the residual sulfur trioxide in the flue gas. The calcium sulfate produced is produced at the bottom of the spray cooling tower (4-1) and is discharged through the cooling tower scraper conveyor (4-2) and the cooling tower ash silo (4-3) in sequence.
[0055] The amount of reagent delivered is adjusted by regulating the size of the reagent delivery pump (4-5), and the temperature at the outlet of the spray cooling tower (4-1) is controlled at around 140℃-150℃, so that the arsenic trioxide in the flue gas is converted from gaseous to solid. The cooled flue gas enters the bag filter arsenic collector (5-1). The flue gas enters the lower chamber of the bag filter arsenic collector (5-1), passes through the filter bag, and the solid arsenic trioxide particles are filtered and trapped on the surface of the filter bag. After being discharged by backflushing, it enters the coarse arsenic ash silo (5-3) via the scraper conveyor (5-2) of the arsenic collector. Finally, the treated flue gas enters the subsequent acid production section through the high temperature fan (5-4).
[0056] If the sulfur trioxide content in the flue gas is low, the first control valve can be closed and the second control valve opened, allowing the flue gas to enter the flue gas exhaust main pipe (6-1) directly from the second branch, and then enter the subsequent acid production section via the high-temperature fan (5-4).
[0057] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. They should not be construed as limiting the specific protection scope of this utility model.
[0058] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0059] Finally, it should be noted that the above are merely preferred embodiments and application principles of this utility model. Those skilled in the art will understand that this utility model is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of this utility model. Therefore, although the utility model has been described in detail through the above embodiments, it is not limited to the specific embodiments described herein. Many other effective embodiments may be included without departing from the concept of this utility model, and the scope of this utility model is determined by the scope of the appended claims.
Claims
1. A device for increasing the rhenium content in white smoke dust, characterized in that, This includes a smelting furnace, a smelting waste heat boiler, a rhenium adsorption tower, a rhenium adsorbent tank, a smelting electrostatic precipitator, a spray cooling tower, a reagent tank, a bag filter for arsenic collection, and a flue gas exhaust manifold. The top of the smelting furnace is equipped with a smelting furnace direct flue, which is connected to the air inlet of the smelting waste heat boiler through a membrane wall; The outlet of the smelting waste heat boiler is connected to the inlet of the rhenium adsorption tower via a pipeline. The outlet of the rhenium adsorption tower is connected to the inlet of the electrostatic precipitator for smelting via a pipeline; The top of the rhenium adsorption tower is also equipped with an adsorbent inlet, and a first atomizing spray gun is inserted into the adsorbent inlet. The rhenium adsorbent tank is connected to the feed end of the first atomizing spray gun through a pipeline. The upper part of the electrostatic precipitator for smelting is provided with an exhaust end, and the exhaust end of the electrostatic precipitator for smelting has two branches, namely the first branch and the second branch. The first branch is connected to the air inlet of the spray cooling tower; the air outlet of the spray cooling tower is connected to the air inlet of the bag filter arsenic collector through a pipeline; the air outlet of the bag filter arsenic collector is connected to the inlet of the flue gas exhaust main through a pipeline; and the second branch is connected to the inlet of the flue gas exhaust main. The top of the spray cooling tower is also equipped with a chemical inlet, into which a second atomizing spray gun is inserted. The chemical tank is connected to the feed end of the second atomizing spray gun through a pipeline.
2. The device for increasing the rhenium content in white smoke dust according to claim 1, characterized in that, This also includes scraper conveyors embedded in smelting waste heat boilers; The discharge end at the bottom of the smelting waste heat boiler is connected to the feed end of the smelting waste heat boiler submerged scraper conveyor through a first discharge pipe with a rigid expansion joint.
3. The device for increasing the rhenium content in white smoke dust according to claim 1, characterized in that, It also includes the rhenium adsorption tower buried scraper conveyor and the rhenium adsorption tower ash silo; The discharge end at the bottom of the rhenium adsorption tower is connected to the feed end of the rhenium adsorption tower buried scraper conveyor through a second discharge pipe with a rigid expansion joint. The discharge end of the rhenium adsorption tower buried scraper conveyor is connected to the feed end of the rhenium adsorption tower ash silo through a pipeline. The discharge end at the bottom of the rhenium adsorption tower ash silo is discharged externally through a pipeline.
4. The apparatus for increasing the rhenium content in white smoke dust according to claim 1, characterized in that, It also includes the electrostatic precipitator buried scraper conveyor and white smoke dust silo; The discharge end of the electrostatic precipitator at the bottom is connected to the feed end of the buried scraper conveyor of the electrostatic precipitator through a third discharge pipe with a rigid expansion joint; the discharge end of the buried scraper conveyor of the electrostatic precipitator is connected to the feed end of the white dust silo through a pipeline, and the discharge end of the bottom of the white dust silo is discharged externally through a pipeline.
5. The apparatus for increasing the rhenium content in white smoke dust according to claim 1, characterized in that, It also includes the cooling tower buried scraper conveyor and the cooling tower ash silo; The discharge end at the bottom of the spray cooling tower is connected to the feed end of the cooling tower buried scraper conveyor through a fourth discharge pipe with a rigid expansion joint; the discharge end of the cooling tower buried scraper conveyor is connected to the feed end of the cooling tower ash silo through a pipeline, and the discharge end at the bottom of the cooling tower ash silo is discharged externally through a pipeline.
6. The apparatus for increasing the rhenium content in white smoke dust according to claim 1, characterized in that, It also includes the arsenic collector buried scraper conveyor and the crude arsenic ash silo; The discharge end of the bag filter arsenic collector is connected to the feed end of the scraper conveyor of the arsenic collector through a fifth discharge pipe with a rigid expansion joint. The discharge end of the scraper conveyor of the arsenic collector is connected to the feed end of the coarse arsenic ash silo through a pipeline. The discharge end of the coarse arsenic ash silo at the bottom is discharged externally through a pipeline.
7. The apparatus for increasing the rhenium content in white smoke dust according to claim 1, characterized in that, A high-temperature fan is installed on the flue gas exhaust main.
8. The apparatus for increasing the rhenium content in white smoke dust according to claim 1, characterized in that, The first branch is equipped with a first control valve, and the second branch is equipped with a second control valve.