A method, system and device for treating carbon-containing gold mine roasting exhaust gas

Abstract

The present application relates to waste gas treatment technical field, specifically to a kind of carbon-containing gold ore roasting waste gas treatment method, system and equipment.A kind of carbon-containing gold ore roasting waste gas treatment equipment, including first washing tower, second washing tower and centrifugal fan, first washing tower is provided with primary filter piece, second washing tower is provided with secondary filter piece, centrifugal fan is provided with tertiary filter piece.The first washing tower upper end is provided with first outlet, and the first outlet is provided with exhaust pipe.The carbon-containing gold ore roasting waste gas treatment equipment of the present application is used, waste gas is sequentially filtered by primary filter piece, secondary filter piece and tertiary filter piece, and the comprehensive purification of waste gas is realized.When the waste gas pressure becomes larger, the waste gas carrying washing liquid will flow downward in the first washing tower in a rotating manner, the washing liquid carried in the waste gas is thrown on the inner wall of the first washing tower, and the gas is discharged after gas-liquid separation, to avoid the loss of a large amount of washing liquid, ensure the normal operation of dust removal.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, specifically to a method, system, and equipment for treating waste gas from the roasting of carbon-containing gold ore. Background Technology

[0002] Carbonaceous gold ores require high-temperature roasting to oxidize and remove carbonaceous materials. Roasting also makes the ore structure looser and more porous, creating favorable conditions for subsequent gold leaching processes and significantly improving gold recovery rates. However, while the roasting process pre-treats the gold ore, it also generates complex waste gases containing sulfur dioxide, dust, and various gaseous pollutants. These waste gases must undergo strict purification treatment to meet environmental emission standards before being released into the atmosphere.

[0003] Dynamic wet scrubbers are highly efficient wet dust removal devices widely used for treating exhaust gas after roasting carbonaceous gold mines. During operation, exhaust gas is drawn tangentially from the bottom into the scrubber by a fan, coming into contact with the scrubbing liquid. Larger particles in the exhaust gas are captured, agglomerated, and retained in the scrubbing liquid, flowing directly to the bottom of the equipment under gravity. Fine particles rise with the airflow and enter the side cleaning fan. The nozzles atomize the scrubbing liquid and spray it out, cleaning the fan blades while simultaneously capturing fine particles. The purified gas flows back to the middle of the scrubber and then exits from the top exhaust port. The scrubbing liquid flows back to the bottom of the scrubber, circulating and washing away dust. However, due to factors such as the combustion state of the roasting furnace and the ore feed rate, the pressure of the exhaust gas entering the treatment equipment is prone to drastic fluctuations. When the high-pressure airflow impacts the inside of the scrubber, it may directly carry away the atomized scrubbing liquid from the fan area, causing backflow. This backflow leads to the loss of scrubbing liquid, affecting the subsequent contact between the exhaust gas and the scrubbing liquid, and reducing dust removal efficiency. Summary of the Invention

[0004] This invention provides a method, system, and equipment for treating exhaust gas from carbon-containing gold ore roasting, in order to solve the problem that in existing treatment equipment, the high-pressure airflow may directly carry away the atomized washing liquid in the fan area, causing backflow of the washing liquid, which affects the full contact between the subsequent exhaust gas and the washing liquid and reduces the dust removal efficiency.

[0005] The present invention provides a carbon-containing gold ore roasting waste gas treatment device with the following technical solution: A carbon-containing gold ore roasting waste gas treatment device includes a first washing tower, a second washing tower, and a centrifugal fan. Both the first and second washing towers are vertically arranged and are cylindrical structures. A first inlet is opened at the lower end of the first washing tower along its tangent direction. The first and second washing towers are connected by a first connecting pipe. A primary filter element is installed inside the first washing tower, and a secondary filter element is installed inside the second washing tower. The centrifugal fan is located at the upper end of the second washing tower, and a tertiary filter element is installed on the centrifugal fan. The primary, secondary, and tertiary filter elements all contain washing liquid. The primary filter element can... The centrifugal fan is used to draw the exhaust gas, after it has been treated by the first filter in the first scrubbing tower, into the second scrubbing tower through the first connecting pipe. The second filter can remove the second particulate matter in the exhaust gas after it has been treated by the first filter, and the third filter can remove the third particulate matter in the exhaust gas after it has been treated by the second filter. The first scrubbing tower has a second inlet at its upper end along its tangential direction. The outlet of the centrifugal fan is connected to the second inlet. The first scrubbing tower has a first outlet at its upper end. An exhaust pipe is installed on the first outlet. The exhaust pipe is installed vertically and is located inside the first scrubbing tower. The opening at the lower end of the exhaust pipe is called the connecting port. The connecting port is located below the second inlet.

[0006] Furthermore, the primary filter element includes a scrubber, which is located below the exhaust pipe and has a disc-shaped structure, and has multiple liquid passage holes evenly distributed on the scrubber.

[0007] Furthermore, the primary filter element also includes a funnel, which is located between the exhaust pipe and the scrubber. The funnel is a cone-shaped funnel that is larger at the top and smaller at the bottom. In the vertical direction, the connection point between the first connecting pipe and the first scrubbing tower is located between the funnel and the scrubber.

[0008] Furthermore, the secondary filter element includes a packed tower and a spray pipe. The packed tower is arranged vertically inside the second washing tower and is filled with multiple packing balls. The spray pipe is located above the packed tower and has multiple spray holes. The spray pipe is connected to an external washing liquid pipeline.

[0009] Furthermore, the packed tower includes a tower body and two trays. The tower body is arranged vertically and has a cylindrical structure. The two trays are fixedly installed at the upper and lower ends of the tower body, respectively. Multiple through holes are opened on both trays, and multiple packing balls are filled into the tower body.

[0010] Furthermore, the tertiary filter includes an atomizing nozzle, which is connected to an external washing liquid pipeline and is positioned facing the blades of the centrifugal fan.

[0011] Furthermore, the tower body is rotatable and has multiple partitioned chambers distributed around the central axis of the tower body. The orientation of the first connecting pipe is referred to as the first direction, which is the horizontal distribution direction of the first and second washing towers. Initially, the number of packing balls in the partitioned chambers closer to the first washing tower is greater than the number of packing balls in the partitioned chambers farther from the first washing tower in the first direction. A detection element is provided on the funnel to detect the height of the washing liquid in the funnel. The detection element can drive the tower body to rotate when the height of the washing liquid in the funnel is greater than a first preset value.

[0012] Furthermore, a rotating shaft is coaxially and fixedly connected to the tower body, and the rotating shaft is driven to rotate by a motor; the detection components include a swing arm, a float and an angle sensor. The swing arm is rotatably installed on the inner wall of the first washing tower and extends into the funnel. A float is provided at the end of the swing arm that extends into the funnel; the angle sensor is installed on the swing arm and is used to detect the swing angle of the swing arm. The angle sensor and the motor are linked by a program control, so that when the swing angle of the swing arm is greater than a second preset value, the angle sensor can drive the motor to start through an external control system.

[0013] The present invention also provides a carbon-containing gold ore roasting waste gas treatment system, including the above-mentioned carbon-containing gold ore roasting waste gas treatment equipment.

[0014] The present invention also provides a method for treating exhaust gas from roasting carbon-containing gold ore, which utilizes the above-mentioned exhaust gas treatment equipment for roasting carbon-containing gold ore and includes the following steps: S10, the exhaust gas after roasting enters the first scrubbing tower from the first inlet and is treated by the first-stage filter to remove the first-stage particulate matter in the exhaust gas.

[0015] S20: The exhaust gas treated by the primary filter in the first scrubbing tower is drawn into the second scrubbing tower by a centrifugal fan, and the exhaust gas is further treated by the secondary filter in the second scrubbing tower to remove secondary particulate matter.

[0016] S30 removes three-stage particulate matter from exhaust gas through a three-stage filter element inside the centrifugal fan;

[0017] S40, the exhaust gas treated by the three-stage filter is sent back to the first scrubbing tower by the centrifugal fan. The exhaust gas will flow downward in a rotating manner in the first scrubbing tower, throwing the scrubbing liquid carried in the exhaust gas onto the inner wall of the first scrubbing tower, and the gas will be discharged upward from the connecting port through the first outlet.

[0018] The beneficial effects of this invention are as follows: The carbon-containing gold ore roasting waste gas treatment equipment of this invention, through the combination of a first scrubbing tower, a second scrubbing tower, and a centrifugal fan, allows the waste gas to undergo triple filtration—first-stage, second-stage, and third-stage filtration—achieving comprehensive purification. Furthermore, when the waste gas pressure increases, after passing through the first, second, and third-stage filters and returning to the first scrubbing tower via the second inlet and the centrifugal fan, the waste gas, which may carry a large amount of scrubbing liquid, is restricted by the exhaust pipe and discharged directly from the first outlet. The waste gas carrying the scrubbing liquid flows downwards in a rotating manner within the first scrubbing tower, throwing the scrubbing liquid onto the inner wall of the first scrubbing tower. The gas is then discharged after gas-liquid separation. Utilizing the cyclone separation principle, the scrubbing liquid that may be carried out is forcibly separated and recovered, preventing a large loss of scrubbing liquid and ensuring sufficient contact between subsequent waste gas and scrubbing liquid, thus improving dust removal efficiency and ensuring normal dust removal operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a carbon-containing gold ore roasting waste gas treatment device according to the present invention.

[0021] Figure 2 This is a side view of the overall structure of an embodiment of a carbon-containing gold ore roasting waste gas treatment device according to the present invention;

[0022] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0023] Figure 4 for Figure 2 A cross-sectional view along the BB direction;

[0024] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0025] Figure 6 This is a front view of the overall structure of an embodiment of a carbon-containing gold ore roasting waste gas treatment device according to the present invention;

[0026] Figure 7 for Figure 6 A cross-sectional view along the DD direction.

[0027] In the diagram: 100, First scrubbing tower; 110, First inlet; 120, First connecting pipe; 130, First-stage filter element; 140, Second connecting pipe; 150, First outlet; 160, Exhaust pipe; 170, Funnel; 180, Swing rod; 190, Float; 200, Second scrubbing tower; 210, Packed tower; 212, Spray pipe; 213, Packing balls; 214, Separated chamber; 215, Rotating shaft; 216, Motor; 300, Centrifugal fan; 310, Third-stage filter element; 400, First support; 500, Second support. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] An embodiment of the present invention for treating exhaust gas from carbon-containing gold ore roasting, such as... Figures 1 to 7 As shown.

[0030] A waste gas treatment device for roasting carbonaceous gold ore includes a first scrubbing tower 100, a second scrubbing tower 200, and a centrifugal fan 300. The first scrubbing tower 100 is fixedly installed on the ground via a first support 400, and the second scrubbing tower 200 is fixedly installed on the ground via a second support 500. Both the first scrubbing tower 100 and the second scrubbing tower 200 are vertically oriented and have a cylindrical structure. A first inlet 110 is provided at the lower end of the first scrubbing tower 100 along its tangential direction, and the first inlet 110 is connected to a pipe from which the waste gas is generated after roasting. The first scrubbing tower 100 and the second scrubbing tower 200 are connected by a first connecting pipe 120, which is horizontally oriented. The first scrubbing tower 100 is equipped with a primary filter element 130, and the second scrubbing tower 200 is equipped with a secondary filter element. A centrifugal fan 300 is located at the top of the second scrubbing tower 200, and a tertiary filter element 310 is installed on the centrifugal fan 300. All three filter elements (primary, secondary, and tertiary) contain scrubbing liquid. The primary filter element 130 removes primary particulate matter from the exhaust gas. The centrifugal fan 300 draws the exhaust gas treated by the primary filter element 130 from the first scrubbing tower 100 into the second scrubbing tower 200 via a first connecting pipe 120. The secondary filter removes secondary particulate matter from the exhaust gas treated by the primary filter element 130, and the tertiary filter element 310 removes tertiary particulate matter from the exhaust gas treated by the secondary filter element. The first washing tower 100 has a second inlet at its upper end along its tangential direction. The air outlet of the centrifugal fan 300 is connected to the second inlet through the second connecting pipe 140. The first washing tower 100 has a first outlet 150 at its upper end. An exhaust pipe 160 is provided on the first outlet 150. The exhaust pipe 160 is arranged vertically and located inside the first washing tower 100. The opening at the lower end of the exhaust pipe 160 is called the connecting port, which is located below the second inlet.

[0031] This embodiment uses a first scrubbing tower 100, a second scrubbing tower 200, and a centrifugal fan 300. During operation, the exhaust gas generated after calcination is introduced into the first inlet 110. After rotating into the first scrubbing tower 100, the exhaust gas is first cleaned and filtered by a primary filter 130 to remove primary particulate matter. Then, the centrifugal fan 300 draws the filtered exhaust gas from the first scrubbing tower 100 into the second scrubbing tower 200. The secondary filter in the second scrubbing tower 200 further cleans and filters the exhaust gas, removing secondary particulate matter. After passing through the secondary filter, the exhaust gas reaches the centrifugal fan 300, where it is further cleaned and filtered by a tertiary filter 310 to remove tertiary particulate matter. Through this triple filtration process—first-stage filter 130, second-stage filter, and third-stage filter 310—the exhaust gas achieves comprehensive purification. That is, the centrifugal fan 300 is used to draw gas from the second scrubbing tower 200, so that the waste gas enters the second scrubbing tower 200 from the first scrubbing tower 100 through the first connecting pipe 120, and the treated waste gas in the second scrubbing tower 200 returns to the first scrubbing tower 100 after passing through the three-stage filter element 310.

[0032] After passing through triple filtration, the exhaust gas will return to the first scrubbing tower 100 through the second inlet. Since the second inlet is set along the tangential direction of the first scrubbing tower 100, the exhaust gas carrying the scrubbing liquid sent out by the centrifugal fan 300 will flow downward in a rotating manner within the first scrubbing tower 100, throwing the scrubbing liquid carried in the exhaust gas onto the inner wall of the first scrubbing tower 100, thus achieving gas-liquid separation. Finally, the gas is discharged upward from the connecting port through the first outlet 150.

[0033] Furthermore, when the exhaust gas pressure increases, the exhaust gas passes through the primary filter 130, the secondary filter, and the tertiary filter 310, and then returns to the first scrubbing tower 100 via the centrifugal fan 300 and the second inlet. At this point, the exhaust gas, which may carry a large amount of scrubbing liquid, will be restricted by the exhaust pipe 160 and discharged directly from the first outlet 150. The exhaust gas carrying the scrubbing liquid will flow downwards in a rotating manner within the first scrubbing tower 100, throwing the scrubbing liquid carried in the exhaust gas onto the inner wall of the first scrubbing tower 100. The gas will then be discharged after gas-liquid separation. By utilizing the cyclone separation principle, the scrubbing liquid that may be carried out is forcibly separated and recovered, avoiding a large loss of scrubbing liquid, which would affect the full contact between the subsequent exhaust gas and the scrubbing liquid, thereby improving dust removal efficiency and ensuring the normal operation of dust removal.

[0034] In a further embodiment, the primary filter element 130 includes a scrubber located below the exhaust pipe 160 and having a disc-shaped structure, and the scrubber has a plurality of liquid passage holes evenly distributed on it.

[0035] Furthermore, the primary filter element 130 also includes a funnel 170, which is disposed between the exhaust pipe 160 and the scrubber. The funnel 170 is a cone-shaped funnel that is larger at the top and smaller at the bottom. In the vertical direction, the connection point between the first connecting pipe 120 and the first scrubbing tower 100 is located between the funnel 170 and the scrubber.

[0036] During operation, when exhaust gas enters the first scrubbing tower 100 through the first inlet 110, larger dust particles in the exhaust gas are captured and condensed by the downward-flowing scrubbing liquid within the scrubber, and then flow directly to the bottom of the equipment under gravity. Furthermore, by installing a funnel 170 below the exhaust pipe 160, when the exhaust gas returns to the first scrubbing tower 100 through the second inlet and undergoes gas-liquid separation by rotating downwards within the first scrubbing tower 100, the separated scrubbing liquid moves down the inner wall of the first scrubbing tower 100 into the funnel 170, and then flows back into the scrubber through the funnel 170 for recycling.

[0037] In a further embodiment, the secondary filter element includes a packed tower 210 and a spray pipe 212. The packed tower 210 is arranged vertically within the second washing tower 200, and is filled with a plurality of packing balls 213, which are polyethylene balls. The spray pipe 212 is located above the packed tower 210, and has a plurality of spray holes. The spray pipe 212 is connected to an external washing liquid pipeline.

[0038] The packed tower 210 includes a tower body and two trays. The tower body is vertically oriented and has a cylindrical structure. The two trays are fixedly installed at the upper and lower ends of the tower body, respectively. Multiple through holes are provided on both trays. Multiple packing balls 213 are filled into the tower body.

[0039] In this embodiment, by setting up a packed tower 210 and a spray pipe 212 in combination, when the exhaust gas filtered by the primary filter element 130 is drawn into the second scrubbing tower 200 by the centrifugal fan 300, the scrubbing liquid is sprayed downward by the spray pipe 212. The exhaust gas will pass through the multiple packing balls 213 and be cleaned by the scrubbing liquid. The packing balls 213 will tumble, rotate and collide with each other under the promotion of the exhaust gas flow, which helps to improve the scrubbing efficiency and scrubbing effect of the scrubbing liquid on the exhaust gas.

[0040] In a further embodiment, the tertiary filter 310 includes an atomizing nozzle that is connected to an external washing liquid pipe and is positioned toward the blades of the centrifugal fan 300.

[0041] In this embodiment, by setting up an atomizing nozzle, the washing liquid is delivered to the blades of the centrifugal fan 300 through the atomizing nozzle during use. The exhaust gas, after being filtered by the secondary filter, arrives at the centrifugal fan 300 and is further cleaned by the washing liquid. The washing liquid also cleans the blades of the centrifugal fan 300, preventing excessive accumulation of impurities on the blades. The washing liquid sprayed through the atomizing nozzle flows back to the first washing tower 100, and after gas-liquid separation, flows to the funnel 170 for recycling and reuse.

[0042] In another possible embodiment, the tower body is rotatably configured and has multiple partitioned chambers 214 distributed around the central axis of the tower body. The orientation of the first connecting pipe 120 is referred to as the first direction, which is the horizontal distribution direction of the first washing tower 100 and the second washing tower 200. Initially, the number of packing balls 213 in the partitioned chambers 214 closer to the first washing tower 100 in the first direction is greater than the number of packing balls 213 in the partitioned chambers 214 farther from the first washing tower 100. A detection element is provided on the funnel 170 to detect the height of the washing liquid in the funnel 170, and the detection element can drive the tower body to rotate when the height of the washing liquid in the funnel 170 is greater than a first preset value.

[0043] The tower body contains multiple partitions evenly distributed around its central axis, and the partition chambers 214 are defined by the tower body and multiple tower plates. Specifically, there are eight partitions, and the tower body and the eight partitions define eight partition chambers 214. A rotating shaft 215 is coaxially and fixedly connected to the tower body, and the rotating shaft 215 is driven to rotate by a motor 216.

[0044] The detection components include a swing arm 180, a float 190, and an angle sensor. The swing arm 180 is rotatably mounted on the inner wall of the first washing tower 100 and extends into the funnel 170. The float 190 is provided at the end of the swing arm 180 that extends into the funnel 170. The angle sensor is mounted on the swing arm 180 and is used to detect the swing angle of the swing arm 180. The angle sensor and the motor 216 are linked by a PLC program, so that when the swing angle of the swing arm 180 is greater than a second preset value, the angle sensor can drive the motor 216 to start through an external control system.

[0045] Two of the eight partitioned chambers 214 arranged sequentially in the first direction are designated as the first chamber and the second chamber, respectively. The first chamber is located on the side of the second chamber closer to the first washing tower 100 in the first direction. The two partitioned chambers 214 located on either side of the first chamber are designated as the third chamber, and the two partitioned chambers 214 located on either side of the second chamber are designated as the fourth chamber. The remaining two partitioned chambers 214 are designated as the fifth chamber. The number of packing balls 213 in the first chamber, the third chamber, the fifth chamber, the fourth chamber, and the second chamber decreases sequentially. That is, see [link to relevant documentation]. Figure 5 As shown, the first chamber is located on the left side and contains the most packing balls 213, while the second chamber is located on the right side and contains the fewest packing balls 213.

[0046] In this embodiment, multiple partitioned chambers 214 are set inside the tower, and the number of packing balls 213 in each partitioned chamber 214 is controlled. When the exhaust gas passes through the primary filter element 130 in the first scrubbing tower 100 and enters the second scrubbing tower 200 through the first connecting pipe 120 under the action of the centrifugal fan 300, the exhaust gas needs to change the direction of airflow, and the exhaust gas will move closer to the second chamber side under the action of the first connecting pipe 120. However, when the pressure of the exhaust gas increases, the scrubbing liquid sprayed from the spray pipe 212 and the scrubbing liquid in the centrifugal fan 300 will be carried away by the exhaust gas and sent back to the first scrubbing tower 100 through the second inlet. As a result, the amount of scrubbing liquid that flows back to the funnel 170 after cyclone separation will increase. With the flow rate of the scrubbing liquid discharged downward in the funnel 170 remaining unchanged, the liquid level of the scrubbing liquid in the funnel 170 will rise, the float ball 190 will float up and drive the swing rod 180 to rotate. Furthermore, when the liquid level of the washing liquid in the funnel 170 exceeds the first preset value, the swing angle of the swing arm 180 will also increase synchronously to exceed the second preset value. The angle sensor will then drive the motor 216 to start via the external control system. The start of the motor 216 will cause the tower body to rotate, causing the tower body to rotate from the side where the second and fourth chambers are located away from the first connecting pipe 120, to the side where the first and third chambers are located away from the first connecting pipe 120. This ensures that when the pressure of the exhaust gas increases and passes through the packed tower 210, the packing balls 213 in the first and third chambers can not only restrict the flow of the exhaust gas, but also ensure sufficient mass transfer with the exhaust gas, reducing the probability of backflow due to increased exhaust gas pressure.

[0047] Based on the above embodiments, the specific working process is as follows:

[0048] When in use, the exhaust gas generated after roasting is introduced into the first inlet 110. After the exhaust gas rotates into the first scrubbing tower 100 from the first inlet 110, the larger dust particles in the exhaust gas will be captured, condensed and retained in the scrubbing liquid flowing downward in the scrubbing tank, and flow directly into the bottom of the equipment under the action of gravity.

[0049] Then, the centrifugal fan 300 draws the waste gas treated by the scrubber in the first scrubbing tower 100 into the second scrubbing tower 200. After the waste gas, filtered by the primary filter element 130, is drawn into the second scrubbing tower 200 by the centrifugal fan 300, scrubbing liquid is sprayed downwards through the spray pipe 212. The waste gas passes through multiple packing balls 213 and is cleaned by the scrubbing liquid. The packing balls 213 will tumble, rotate, and collide with each other under the impetus of the waste gas flow, which helps to improve the scrubbing efficiency and effect of the scrubbing liquid on the waste gas. The waste gas filtered by the secondary filter element will then reach the centrifugal fan 300, where it will be further cleaned by the scrubbing liquid. The scrubbing liquid can also clean the blades of the centrifugal fan 300, preventing excessive accumulation of impurities on the blades.

[0050] After undergoing triple filtration, the exhaust gas returns to the first scrubbing tower 100 via the second inlet. Because the second inlet is tangentially positioned within the first scrubbing tower 100, the exhaust gas, driven by the centrifugal fan 300, flows downwards in a rotating manner within the first scrubbing tower 100, throwing the scrubbing liquid carried within it onto the inner wall of the first scrubbing tower 100. The liquid then flows down the inner wall of the first scrubbing tower 100 into the funnel 170 and is subsequently returned to the scrubber via the funnel 170 for recycling. The gas then exits upwards through the connecting port via the first outlet 150.

[0051] Furthermore, when the exhaust gas pressure increases, the washing liquid sprayed from the spray pipe 212 and the washing liquid in the centrifugal fan 300 will be carried away by the exhaust gas simultaneously and sent back to the first scrubbing tower 100 through the second inlet. At this time, the exhaust gas that may carry a large amount of washing liquid will be restricted by the exhaust pipe 160 and discharged directly from the first outlet 150. The exhaust gas carrying washing liquid will flow downward in a rotating manner in the first scrubbing tower 100, throwing the washing liquid carried in the exhaust gas onto the inner wall of the first scrubbing tower 100, and the gas will be discharged after gas-liquid separation. By using the cyclone separation principle, the washing liquid that may be carried out is forcibly separated and recovered, avoiding a large loss of washing liquid, which would affect the full contact between the subsequent exhaust gas and the washing liquid, improve dust removal efficiency, and ensure the normal operation of dust removal.

[0052] The present invention also provides a carbon-containing gold ore roasting waste gas treatment system, including the above-mentioned carbon-containing gold ore roasting waste gas treatment equipment.

[0053] This invention also provides a method for treating exhaust gas from roasting carbon-containing gold ore, utilizing the aforementioned exhaust gas treatment equipment for roasting carbon-containing gold ore, comprising the following steps:

[0054] S10 allows the calcined exhaust gas to enter the first scrubbing tower 100 from the first inlet 110, and the exhaust gas is treated by the primary filter element 130 to remove primary particulate matter from the exhaust gas.

[0055] S20, the exhaust gas treated by the primary filter element 130 in the first scrubbing tower 100 is drawn into the second scrubbing tower 200 by the centrifugal fan 300, and the exhaust gas is further treated by the secondary filter element in the second scrubbing tower 200 to remove secondary particulate matter in the exhaust gas.

[0056] S30 removes tertiary particulate matter from the exhaust gas through a three-stage filter element 310 inside the centrifugal fan 300.

[0057] S40, the exhaust gas treated by the three-stage filter element 310 is sent back to the first scrubbing tower 100 by the centrifugal fan 300. The exhaust gas will flow downward in a rotating manner in the first scrubbing tower 100, throwing the scrubbing liquid carried in the exhaust gas onto the inner wall of the first scrubbing tower 100, and the gas will be discharged upward from the connecting port through the first outlet 150.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for treating exhaust gas from carbon-containing gold ore roasting, characterized in that: The system includes a first scrubbing tower, a second scrubbing tower, and a centrifugal fan. Both the first and second scrubbing towers are vertically oriented and cylindrical. A first inlet is located at the lower end of the first scrubbing tower along its tangent direction. The first and second scrubbing towers are connected by a first connecting pipe. A primary filter is installed in the first scrubbing tower, and a secondary filter is installed in the second scrubbing tower. The centrifugal fan is located at the upper end of the second scrubbing tower and has a tertiary filter installed on it. All three filters contain scrubbing liquid. The primary filter removes primary particulate matter from the exhaust gas. The centrifugal fan directs the exhaust gas treated by the primary filter in the first scrubbing tower through the first connecting pipe. The gas is drawn into the second scrubbing tower. The secondary filter removes secondary particulate matter from the exhaust gas treated by the primary filter, and the tertiary filter removes tertiary particulate matter from the exhaust gas treated by the secondary filter. The first scrubbing tower has a second inlet tangentially located at its upper end, and the outlet of the centrifugal fan is connected to the second inlet. The first scrubbing tower has a first outlet at its upper end, and an exhaust pipe is installed on the first outlet. The exhaust pipe is vertically positioned inside the first scrubbing tower, and the opening at the lower end of the exhaust pipe is called the connecting port, which is located below the second inlet. The primary filter includes a scrubber, which is located below the exhaust pipe and has a disc-shaped structure with multiple liquid passage holes evenly distributed on it. The primary filter also includes a funnel, positioned between the exhaust pipe and the scrubber. The funnel is a cone-shaped funnel, wider at the top and narrower at the bottom. Vertically, the connection between the first connecting pipe and the first scrubbing tower is located between the funnel and the scrubber. The secondary filter includes a packed tower and a spray pipe. The packed tower is vertically positioned within the second scrubbing tower and is filled with multiple packing balls. The spray pipe is located above the packed tower and has multiple spray holes, connecting to an external scrubbing liquid pipeline. The packed tower includes a tower body and two trays. The tower body is vertically positioned and has a cylindrical structure. The two trays are fixedly installed at the upper and lower ends of the tower body, respectively. Both trays have multiple through holes. All packing balls are filled into the tower body; the tower body is rotatable and has multiple partitioned chambers distributed around the central axis of the tower body. The direction of the first connecting pipe is called the first direction, which is the horizontal distribution direction of the first washing tower and the second washing tower. In the initial state, the number of packing balls in the partitioned chambers closer to the first washing tower in the first direction is greater than the number of packing balls in the partitioned chambers farther away from the first washing tower. A detection element is provided on the funnel to detect the height of the washing liquid in the funnel. The detection element can drive the tower body to rotate when the height of the washing liquid in the funnel is greater than a first preset value.

2. The waste gas treatment equipment for roasting carbonaceous gold ore according to claim 1, characterized in that: The three-stage filter includes an atomizing nozzle, which is connected to an external washing liquid pipeline and is positioned facing the blades of the centrifugal fan.

3. The waste gas treatment equipment for roasting carbonaceous gold ore according to claim 1, characterized in that: A rotating shaft is coaxially and fixedly connected to the tower body, and the rotating shaft is driven to rotate by a motor. The detection components include a swing arm, a float, and an angle sensor. The swing arm is rotatably installed on the inner wall of the first washing tower and extends into the funnel. A float is provided at the end of the swing arm that extends into the funnel. The angle sensor is installed on the swing arm and is used to detect the swing angle of the swing arm. The angle sensor and the motor are linked by a program control, so that when the swing angle of the swing arm is greater than a second preset value, the angle sensor can drive the motor to start through an external control system.

4. A waste gas treatment system for roasting carbonaceous gold ore, characterized in that: The equipment includes the waste gas treatment equipment for roasting carbon-containing gold ore as described in any one of claims 1 to 3.

5. A method for treating exhaust gas from roasting carbon-containing gold ore, utilizing the exhaust gas treatment equipment for roasting carbon-containing gold ore as described in any one of claims 1 to 3, characterized in that: Includes the following steps: S10 allows the calcined exhaust gas to enter the first scrubbing tower through the first inlet, and the exhaust gas is treated by the first-stage filter to remove primary particulate matter from the exhaust gas. S20: The exhaust gas treated by the primary filter in the first scrubbing tower is drawn into the second scrubbing tower by a centrifugal fan, and the exhaust gas is further treated by the secondary filter in the second scrubbing tower to remove secondary particulate matter. S30 removes three-stage particulate matter from exhaust gas through a three-stage filter element inside the centrifugal fan; S40, the exhaust gas treated by the three-stage filter is sent back to the first scrubbing tower by the centrifugal fan. The exhaust gas will flow downward in a rotating manner in the first scrubbing tower, throwing the scrubbing liquid carried in the exhaust gas onto the inner wall of the first scrubbing tower, and the gas will be discharged upward from the connecting port through the first outlet.

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