High-efficiency ashing roasting device for silver charcoal carrying gold
By introducing a cooling system and a cyclone dust collector into the ashing and roasting device, the problem of uneven temperature during the ashing process of gold and silver loaded charcoal was solved, achieving a balanced temperature distribution and efficient recovery of precious metals, thereby reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUNNAN GOLD MINING GRP
- Filing Date
- 2025-08-05
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies cannot accurately control combustion temperature and combustion air volume, resulting in uneven temperature during the ashing process of gold and silver loaded charcoal. This leads to incomplete burning and sintering of activated carbon, as well as waste of gold and silver resources. Furthermore, it complicates downstream metallurgical processes and increases costs.
The ashing and roasting device is used, combined with a cooling system and electric furnace temperature control. The temperature is controlled layer by layer by a serpentine cooling pipe and combined with the air volume control to achieve a uniform temperature distribution. A cyclone dust collector is used to recover precious metal particles.
It achieves a uniform distribution of roasting temperature for crushed charcoal, improves roasting rate and efficiency, reduces dust emissions, enables efficient recovery and utilization of gold and silver, and lowers production costs.
Smart Images
Figure CN224530975U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gold and silver loaded charcoal processing technology, specifically to a high-efficiency ashing and roasting device for gold and silver loaded charcoal. Background Technology
[0002] Activated carbon is a crucial carrier for the enrichment and recovery of gold and silver precious metals in the gold industry, widely used in carbon leaching, heap leaching, and the adsorption of these metals in wastewater from gold smelting and other gold extraction processes. However, during use, due to wear and breakage, a large amount of small-particle-size, high-specific-surface-area, and highly adsorption-capable activated carbon (including fine-particle carbon powder) is generated. While these carbon fragments contain relatively high grades of gold and silver, they often become contaminated with mineral-based impurities during collection, resulting in a lower overall gold and silver grade in the final activated carbon product.
[0003] Carbon-in-pulp (CIP) plants generate a certain amount of broken carbon annually. Smaller CIP plants produce less broken carbon, while large CIP plants can produce hundreds of tons annually. The sources of broken carbon include fine-grained carbon recovered from safety screens and carbon sludge from carbon washing, with a particle size greater than 32 mesh, high impurity content, and gold content of approximately 10 g / t to 200 g / t; and coarser-grained carbon obtained after desorbed carbon screening, with a particle size less than 18 mesh and a gold content greater than 500 g / t. Because of their lower grade, this broken carbon is unsuitable for return to the original process and usually requires specialized treatment.
[0004] Currently, enterprises primarily handle these charcoal fragments through traditional ashing and roasting. However, due to the inability to accurately control combustion temperature and combustion air volume, uneven local combustion temperatures result in issues such as incomplete burning of activated carbon and encapsulation by sintered impurities. This not only reduces the recovery rate of gold and silver but also complicates downstream hydrometallurgical processes and increases production costs. Furthermore, during ashing and combustion, gold and silver are emitted with the flue gas, making them difficult to collect and recover, further contributing to resource waste.
[0005] A gold-containing material ashing device (CN213476074U) includes a guide rail, an ashing chamber, a material storage and transportation system, and a combustion-supporting induced draft fan. One end of the guide rail is fixed to the floor inside the ashing chamber, and the other end is located on the floor outside the ashing chamber. The material storage and transportation system is connected to the guide rail outside the ashing chamber. The ashing chamber is equipped with an exhaust port, a temperature measuring element, and an air inlet pipe. A heating element is installed inside the ashing chamber. The combustion-supporting induced draft fan is connected to the exhaust port on the ashing chamber via an induced draft pipe. This device attempts to control the temperature and promote activated carbon combustion by installing heating elements and controlling the air volume inside the ashing chamber. It also employs a layered material storage method, where each layer of material burns simultaneously after ignition. However, this method suffers from extremely uneven temperature distribution. The burning material in the lower layers also heats the upper layers, resulting in large temperature differences between layers. Relying solely on heating elements installed around the perimeter and induced draft fan for control cannot achieve uniform temperature distribution, leading to severe sintering of the material or incomplete burning of the activated carbon. Furthermore, the material tray suffers severe burn-out, and the device has poor adaptability.
[0006] Based on the defects and shortcomings of the existing technology, this application proposes a novel high-efficiency ashing and roasting device for gold and silver loaded charcoal, aiming to overcome the shortcomings of the existing technology and provide a more efficient, stable, environmentally friendly and low-cost solution. Utility Model Content
[0007] This invention provides a highly efficient ashing and roasting device for gold and silver-loaded charcoal.
[0008] The specific technical solution is as follows: A high-efficiency ashing and roasting device for gold and silver-loaded charcoal includes an ashing and roasting chamber, a charcoal storage and transportation system, a combustion-supporting induced draft fan, and a cyclone dust collector; an exhaust port is provided on the top wall of the ashing and roasting chamber, the exhaust port is connected to the combustion-supporting induced draft fan through an induced draft pipe, and the exhaust port of the combustion-supporting induced draft fan is connected to the feed port of the cyclone dust collector through a pipe. A track is installed on the bottom wall of the ashing and roasting chamber, with one end of the track extending to the ground outside the ashing and roasting chamber. The charcoal storage and transportation system is installed on track 1 located outside the ashing and roasting chamber. The charcoal storage and transportation system includes a sealed door, a material tray, a layered support, pulleys, and a cooling system. The layered material tray support is installed inside the sealed door, and multiple pulleys are installed at the bottom of the layered support. The pulleys 2 are slidably installed on the track. The cooling system includes an inlet pipe, a serpentine cooling pipe, and an outlet pipe. The inlet pipe and the outlet pipe are both installed through the sealed door. Multiple layers of serpentine cooling pipes are connected between the inlet pipe and the outlet pipe. The serpentine cooling pipes are installed at the bottom of each layer of the layered support.
[0009] Furthermore, preferably, a water pressure gauge and a ball valve are installed sequentially on the water inlet pipe.
[0010] Furthermore, preferably, the material tray consists of a material tray body and support legs, with the support legs embedded in a layered support frame.
[0011] Furthermore, preferably, the ashing and roasting chamber is equipped with a thermometer and a heating furnace plate, and several air inlets are provided on the bottom wall or side wall.
[0012] Furthermore, preferably, the material tray, layered support, water inlet pipe, serpentine cooling pipe and water outlet pipe are all made of 304 or 316L stainless steel.
[0013] Furthermore, preferably, the inner walls of the ashing and roasting chamber and the sealed door are both equipped with ceramic fiber modules or refractory bricks as insulation materials.
[0014] The beneficial effects of this invention are as follows: By cleverly setting up a cooling system in a specific area, the cooling water flows from top to bottom through the material layer, achieving stepped temperature control. Simultaneously, combined with electric furnace temperature control and induced draft volume control, it enables coordinated control of multiple parameters for gold-containing materials such as charcoal and charcoal sludge. This achieves precise control of roasting temperature and airflow, ensuring a balanced roasting temperature distribution. This not only improves the roasting rate and ashing efficiency of the charcoal but also enhances its adaptability to materials with different carbon contents. Furthermore, the cyclone dust collector in the device utilizes the cyclone separation principle to effectively recover precious metal particles such as gold and silver from the exhaust gas, achieving efficient resource utilization, reducing dust emissions, and demonstrating significant economic and environmental benefits. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of a high-efficiency ashing and roasting device for carrying gold and silver crushed charcoal according to the present invention. Figure 2 This is a schematic diagram of the structure of the single-layer serpentine cooling pipe of this utility model; Figure 3 This is a schematic diagram of the material tray structure; In the diagram: 1-track; 2-pulley; 3-outlet pipe; 4-inlet pipe; 5-water pressure gauge; 6-ball valve; 7-sealing door; 8-serpentine cooling pipe; 9-material tray; 9-1 tray body; 9-2 support leg; 10-layer support; 11-ashing and roasting chamber; 12-thermometer; 13-exhaust pipe outlet; 14-heating furnace tray; 15-exhaust duct; 16-combustion induced draft fan; 17-air inlet; 18-cyclone dust collector. Detailed Implementation
[0016] To make the technical problems and solutions solved by this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.
[0017] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0018] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0019] like Figure 1 As shown, a high-efficiency ashing and roasting device for gold and silver-loaded charcoal includes an ashing and roasting chamber 11, a charcoal storage and transportation system, a combustion-supporting blower 16, and a cyclone dust collector 18. The ashing and roasting chamber 11 is equipped with a thermometer 12 and a heating furnace plate 14. An exhaust port 13 is opened on the top wall, and several air inlets 17 are opened on the bottom or side walls. A track 1 is installed on the inner bottom wall; one end of the track 1 extends to the ground outside the ashing and roasting chamber 11, and the charcoal storage and transportation system is installed on the track 1 located outside the ashing and roasting chamber 11.
[0020] The charcoal storage and transportation system includes a sealed door 7, material trays 9, a tiered support 10, pulleys 2, and a cooling system. The material trays 9 are sequentially placed on the tiered material tray support 10, which is installed inside the sealed door 7 (specifically, it can be connected to the sealed door 7 via bolts). Multiple pulleys 2 are installed at the bottom of the tiered support 10, and the pulleys 2 are slidably mounted on a track 11. The charcoal storage and transportation system uses the cooperation of the pulleys 2 and the track 11 to smoothly deliver the charcoal into the ashing and roasting chamber 11. Furthermore, combined with… Figure 2 As shown, the cooling system includes an inlet pipe 4, a water pressure gauge 5, a ball valve 6, a serpentine cooling pipe 8, and an outlet pipe 3. The water pressure gauge 5 and the ball valve 6 are installed sequentially on the inlet pipe 4. Both the inlet pipe 4 and the outlet pipe 3 are installed through the sealing door 7. Multiple layers of serpentine cooling pipes 8 are connected between the inlet pipe 4 and the outlet pipe 3. The serpentine cooling pipes 8 are installed at the bottom of each layer of the layered support 10 (the number of serpentine cooling pipes 8 is the same as the number of layers of the layered support 10).
[0021] The combustion-supporting induced draft fan 16 and the cyclone dust collector 18 are located outside the ashing and roasting chamber 11. The combustion-supporting induced draft fan 16 is connected to the exhaust port 13 at the top of the ashing and roasting chamber 11 via the induced draft pipe 15. This serves two purposes: firstly, it extracts the waste gas generated inside the ashing and roasting chamber 11, ensuring stable air pressure; secondly, it provides necessary airflow for roasting, promoting combustion efficiency. The outlet of the combustion-supporting induced draft fan 16 is connected to the inlet of the cyclone dust collector 18 via a pipe. After the waste gas is extracted by the combustion-supporting induced draft fan 16, it directly enters the cyclone dust collector 18. The cyclone dust collector 18 uses the cyclone separation principle to separate dust particles from the waste gas. These dust particles also contain precious metal particles such as gold and silver, which can be further processed for resource recovery. Simultaneously, it effectively purifies the waste gas, reducing dust emissions and environmental pollution.
[0022] Further optimizations, such as Figure 3 As shown, the material tray 9 consists of a loading tray body 9-1 and support legs 9-2. The support legs 9-2 can be embedded in the layered support 10 to ensure placement stability. The material tray 9, layered support 10, water inlet pipe 4, serpentine cooling pipe 8, and water outlet pipe 3 are all made of 304 or 316L stainless steel. The inner walls of the ashing and roasting chamber 11 and the sealing door 7 are equipped with ceramic fiber modules or refractory bricks as insulation materials. The heating furnace plate 14 uses any of the following: iron-chromium-aluminum alloy heating wire, nickel-chromium alloy heating wire, or silicon carbide rod, and can be installed at any position on the inner wall of the ashing and roasting chamber 11. The combustion-supporting induced draft fan 16 adopts a variable frequency control mode. The cyclone dust collector 18 adopts an existing product on the market.
[0023] The working process of this utility model: The material is placed into multiple trays 9, which are then placed sequentially onto the layered tray support 10. Once the material is ready, the layered support 10 slides smoothly along the track 1 using the pulleys 2 and the track 1 until the sealing door 7 seals the ashing and roasting chamber 11. At this time, the heating furnace 14, the combustion-supporting induced draft fan 16, and the cyclone dust collector 18 are simultaneously activated. The heating furnace 14 begins heating to roast the charcoal. The combustion-supporting induced draft fan 16 extracts the exhaust gas generated within the ashing and roasting chamber 11 to ensure stable air pressure; simultaneously, it continuously draws in outside air to provide necessary airflow for roasting and promote combustion efficiency. After the exhaust gas is drawn out by the combustion-supporting induced draft fan 16, it will directly enter the cyclone dust collector 18. The cyclone dust collector 18 will separate the dust particles in the exhaust gas, which can not only effectively purify the exhaust gas and reduce the pollution of the environment by dust emissions, but also further recover precious metals such as gold and silver in the exhaust gas, realizing the efficient utilization of resources.
[0024] During the roasting process, thermometer 12 displays the indoor temperature changes in real time. When the roasting temperature is too high, the cooling system activates, introducing cooling water into the inlet pipe 4. The cooling water flows from top to bottom through the serpentine cooling pipe 8 below the material, ensuring that the high-temperature material layer first encounters the low-temperature cooling water, thus lowering the temperature of the high-temperature material layer. The cooling water continues to flow downwards, balancing the roasting temperature of each layer. Simultaneously, combined with electric furnace temperature control and induced draft adjustment, the roasting temperature of the material inside the chamber is evenly distributed, improving the roasting rate and ashing efficiency of the charcoal, and solving problems such as incomplete roasting or over-sintering caused by uneven temperature.
[0025] In actual use, the movement of pulley 2 along track 1 in the charcoal crushing and transportation system can be driven by a transmission motor, enabling automatic movement. Simultaneously, an electrical control system can be equipped to centrally control equipment such as the heating furnace plate 14, thermometer 12, combustion-supporting draft fan 16, and transmission motor, further improving the precise control of temperature and airflow within the ashing and roasting chamber 11 and optimizing the charcoal crushing and ashing effect. Of course, the configuration of the transmission motor and the electrical control system are conventional existing technologies and will not be elaborated upon here.
[0026] The present invention has been described in detail above through specific and preferred embodiments. However, those skilled in the art should understand that the present invention is not limited to the embodiments described above. Any modifications or equivalent substitutions made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A high-efficiency ashing and roasting device for gold and silver-loaded charcoal, characterized in that: It includes an ashing and roasting chamber (11), a charcoal storage and transportation system, a combustion-supporting induced draft fan (16), and a cyclone dust collector (18); an exhaust port (13) is provided on the top wall of the ashing and roasting chamber (11), the exhaust port (13) is connected to the combustion-supporting induced draft fan (16) through an induced draft pipe (15), and the exhaust port of the combustion-supporting induced draft fan (16) is connected to the feed port of the cyclone dust collector (18) through a pipe; A track (1) is installed on the bottom wall of the ashing and roasting chamber (11). One end of the track (1) extends to the ground outside the ashing and roasting chamber (11). The charcoal storage and transportation system is installed on the track (1) located outside the ashing and roasting chamber (11). The charcoal storage and transportation system includes a sealing door (7), a material tray (9), a layered support (10), pulleys (2), and a cooling system. The layered support (10) is installed inside the sealing door (7). Multiple pulleys (2) are installed at the bottom of the layered support (10). The pulleys (2) slide on the track (1). The cooling system includes an inlet pipe (4), a serpentine cooling pipe (8), and an outlet pipe (3). The inlet pipe (4) and the outlet pipe (3) are both installed through the sealing door (7). Multiple serpentine cooling pipes (8) are connected between the inlet pipe (4) and the outlet pipe (3). The serpentine cooling pipes (8) are installed at the bottom of each layer of the layered support (10).
2. The high-efficiency ashing and roasting device for gold and silver-loaded charcoal according to claim 1, characterized in that: A water pressure gauge (5) and a ball valve (6) are installed sequentially on the water inlet pipe (4).
3. The high-efficiency ashing and roasting device for gold and silver-loaded charcoal according to claim 1, characterized in that: The material tray (9) consists of a material tray body (9-1) and a support leg (9-2), and the support leg (9-2) can be embedded in the layered support (10).
4. The high-efficiency ashing and roasting device for gold and silver-loaded charcoal according to claim 1, characterized in that: The ashing and roasting chamber (11) is equipped with a thermometer (12) and a heating electric furnace plate (14), and several air inlets (17) are opened on the bottom wall or side wall.
5. The high-efficiency ashing and roasting apparatus for gold and silver-loaded charcoal according to any one of claims 1-4, characterized in that: The tray (9), layered support (10), water inlet pipe (4), serpentine cooling pipe (8) and water outlet pipe (3) are all made of 304 or 316L stainless steel.
6. The high-efficiency ashing and roasting apparatus for gold and silver-loaded charcoal according to any one of claims 1-4, characterized in that: The inner walls of the ashing and roasting chamber (11) and the sealed door (7) are both equipped with ceramic fiber modules or refractory bricks as insulation materials.