A net impurity enrichment type noble metal roaster

Abstract

The utility model discloses a kind of net impurity enrichment type noble metal roasting furnace, including furnace body, furnace body front side is equipped with split double open furnace door, split double open furnace door and furnace body closure are equipped with inlaid furnace door buffer;Furnace body top is equipped with trapezoidal horn mouth fume hood, furnace body is equipped with internal circulation type furnace chamber, internal circulation type furnace chamber is equipped with several material tray, the resistance zone is embedded in furnace body bottom.This utility model furnace body uses firebrick and ramming material masonry, heat insulation performance is good, effectively reduce the loss of heat energy, improve the roasting efficiency, reduce energy consumption;Internal circulation type furnace chamber design makes the temperature distribution in furnace uniform, guarantee the consistency of roasting effect;Trapezoidal horn mouth fume hood angle design, ensure that internal smoke resistance is smaller, shape design is horn shape, for increasing flue gas collection area, improve flue gas collection efficiency.The roasting furnace has extensive popularization and application value in noble metal metallurgy field, and can be used to treat various low-grade noble metal materials to realize impurity removal and recovery.

Description

Technical Field

[0001] This utility model relates to the field of precious metal smelting technology, specifically a clean and enriched precious metal roasting furnace. Background Technology

[0002] Platinum group metals (PGMs) come from diverse sources, including ores, spent catalysts, and electronic waste. Each source has a significantly different chemical composition and contains various impurity elements. Pretreatment of these materials is a prerequisite for recycling and purification. The different sources and types of raw materials result in variations in the forms and amounts of PGMs, as well as significant differences in the properties of the carriers, making the pretreatment process quite complex. Currently, for low-grade materials with high base metal content, traditional roasting processes are still considered for impurity removal and purification. Through roasting pretreatment with appropriate reagents, certain metal sulfides, selenides, and other compounds in the furnace charge can be converted into water-soluble salts or directly volatilized and removed. Traditional roasting furnaces suffer from problems such as unreasonable furnace structure, low flue gas collection efficiency, and high energy consumption, failing to meet the demands of modern smelting technology. Therefore, developing a structurally sound, highly efficient, and energy-saving clean-impurity enrichment type precious metal roasting furnace is of great significance. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned technical problems of traditional roasting furnaces and to provide a clean and impurity-enriched precious metal roasting furnace.

[0004] To achieve its purpose, this utility model adopts the following technical solution: A clean and enriched precious metal roasting furnace includes a furnace body with a split double-opening furnace door on the front side. An embedded furnace door buffer is installed at the closure point between the split double-opening furnace door and the furnace body to ensure safe and convenient opening and closing. A trapezoidal flared smoke hood is installed on the top of the furnace body. The flue gas generated during pyrolysis inside the roasting furnace is drawn away through the flue gas pipe by the trapezoidal flared smoke hood. The flared shape of the smoke hood increases the flue gas collection area and improves the flue gas collection efficiency. An internal circulation furnace chamber is provided inside the furnace body for easy material loading and unloading and roasting process control. Several material trays are provided inside the internal circulation furnace chamber for loading the materials to be roasted. A resistance band is embedded at the bottom of the furnace body.

[0005] As a further improvement to the technical solution of this utility model, the main body of the furnace is square in shape and is constructed of fireproof bricks and ramming material. It has an internal insulation layer to provide the heat insulation environment required for roasting. The walls around the furnace are 300mm thick, and the side walls of the split double-opening furnace door are 200mm thick.

[0006] Furthermore, the split double-opening furnace door is connected to the furnace body by a spring hinge, and a buckle is provided at the closing point of the split double-opening furnace door.

[0007] Furthermore, the internal circulation furnace cavity is internally permeable and covered with heat-insulating material. This furnace cavity design ensures uniform temperature distribution within the furnace, guaranteeing the roasting effect.

[0008] Furthermore, the trapezoidal horn-shaped smoke hood has an angle of 35~55° with the furnace body to ensure low internal smoke resistance, and its horn-shaped design increases the smoke collection area and improves the smoke collection efficiency.

[0009] Furthermore, the resistance strip is treated with anti-corrosion and is distributed in a disc at the bottom of the furnace body. Each strip has a power of 40KW and is connected in a Y-shape. The resistance strip lead rods penetrate the furnace body and are protected by an insulating sheath. The openings of the resistance strip lead rods are connected to the cable lugs, providing a uniform and low-energy heating method.

[0010] Furthermore, the resistor strip is made of Cr20Ni80 and coated with a ceramic-based anti-corrosion coating, which has excellent high-temperature resistance and corrosion resistance.

[0011] Furthermore, the trays are multiple sets that are evenly stacked. Preferably, there are four sets, totaling 32 trays.

[0012] This utility model's furnace body is constructed with fireproof bricks and rammed earth, providing excellent thermal insulation and effectively reducing heat loss, improving roasting efficiency, and lowering energy consumption. The internal circulation furnace cavity design ensures uniform temperature distribution and consistent roasting results. The trapezoidal flared smoke hood's angle design minimizes internal smoke resistance, and its flared shape increases the smoke collection area and improves collection efficiency. The split double-opening furnace door and embedded door buffer design ensure safe and convenient door opening and closing. Therefore, this roasting furnace has broad application value in the precious metal metallurgy field and can be used to process various low-grade precious metal materials for impurity removal and recovery.

[0013] In summary, this utility model, through optimized design of the furnace structure and accessories, can improve the convenience and safety of the precious metal recycling process, while also reducing environmental pollution. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the furnace body construction of this utility model; Figure 2 This is a structural diagram of the trapezoidal flared smoke collection hood of this utility model; Figure 3 This is a structural diagram of the internal circulation furnace cavity of this utility model; The meanings of the symbols in the attached drawings are as follows: 1. Furnace body; 2. Split double-opening furnace door; 3. Embedded furnace door buffer; 4. Internal circulation furnace cavity; 5. Trapezoidal flared smoke hood; 6. Disc-type resistance band; 7. Material tray; 8. Resistance band lead-out rod. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0016] like Figure 1 As shown, this utility model provides a clean and enriched precious metal roasting furnace, including a furnace body 1. The main body of the furnace body 1 is square in shape and is constructed of fireproof bricks and rammed earth. It has an internal insulation layer to provide the heat insulation environment required for roasting. The front of the furnace body 1 is connected to a split double-opening furnace door 2 by a spring hinge. An embedded furnace door buffer 3 is provided at the closing point between the split double-opening furnace door 2 and the furnace body 1 to ensure safe and convenient opening and closing. The top of the furnace body 1 is provided with a trapezoidal flared smoke hood 5. The flue gas generated by pyrolysis in the roasting furnace is drawn away through the flue gas pipe by the trapezoidal flared smoke hood 5. The fume hood is funnel-shaped, which increases the fume collection area and improves the fume collection efficiency. The furnace body 1 contains an internal circulation furnace chamber 4. Based on the natural convection effect driven by temperature difference, when the bottom resistance band heats the working fluid (mainly air) in the furnace chamber, the working fluid expands due to thermal expansion, causing a decrease in density and generating buoyancy. The high-temperature working fluid rises along the heating side cavity and enters the adjacent furnace chamber through the top connecting channel. Simultaneously, the relatively lower-temperature working fluid flows back to the heating side due to the density gradient through the bottom guiding structure, forming a closed thermodynamic circulation loop. The internal circulation furnace chamber 4 is internally permeable and covered with insulation material, facilitating material loading and unloading and roasting process control. Several material trays 7 are provided inside the internal circulation furnace chamber 4 for loading the materials to be roasted. A resistance band 6 is embedded at the bottom of the furnace body 1.

[0017] Specifically, the walls of the furnace body 1 are 300mm thick, the walls of the split double-opening furnace door 2 are 200mm thick, and the closing part of the split double-opening furnace door 2 is equipped with a buckle (existing technology, not shown in the figure).

[0018] Specifically, the trapezoidal horn-shaped smoke hood 5 has an angle of 35~55° with the furnace body to ensure low internal smoke resistance, and its horn-shaped design increases the smoke collection area and improves the smoke collection efficiency.

[0019] Specifically, the resistance strip 6 is treated with anti-corrosion and is distributed in a disc at the bottom of the furnace body 1. Each strip has a power of 40KW and is connected in a Y-shape. The resistance strip lead rod 8 passes through the furnace body 1 and is protected by an insulating sheath. The opening of the resistance strip lead rod 8 is connected to the cable lug, providing a uniform and low-energy heating method.

[0020] Specifically, the resistor strip 6 is made of Cr20Ni80 and its surface is coated with a ceramic-based anti-corrosion coating with excellent high-temperature resistance and corrosion resistance.

[0021] Furthermore, the trays 7 are multiple sets that are evenly stacked. Preferably, there are four sets, totaling 32 trays 7.

[0022] When using this new type of roasting furnace for precious metal roasting, the complex low-grade precious metal material is first transferred to the feeding tray 7. The split double-opening furnace door 2 is opened, and the material tray 7 is evenly placed inside the internal circulation furnace chamber 4 using electric transfer tools such as forklifts. After checking that the trapezoidal flared smoke hood 5 is normal, the exhaust pipe valve is opened. After confirming that the flue gas check valve and absorption device connected to the trapezoidal flared smoke hood 5 are normal, the split double-opening furnace door 2 is closed. The embedded furnace door buffer 3 is checked, and after confirming that the door is closed in place, the furnace door latch is closed. The temperature control system is turned on to raise the temperature and carry out the roasting of precious metal materials. After the roasting furnace is heated under controlled temperature, the program is turned off, the power is cut off, and the temperature is lowered to below 120°C. The furnace door latch is then opened, and the furnace door is slightly opened by the spring hinge. Personnel operate to open the split double-opening furnace door 2, and use electric forklifts or other tools to transfer the material out of the furnace.

[0023] This invention can also be used in other scenarios where constant temperature roasting is required in the hydrometallurgical process of precious metals. Without violating the design essence of this invention, those skilled in the art can also make simple improvements to the roasting furnace for use in related fields.

Claims

1. A precious metal roasting furnace for purification and enrichment, characterized in that, The furnace includes a furnace body (1), a split double-opening furnace door (2) on the front side of the furnace body (1), an embedded furnace door buffer (3) at the closure of the split double-opening furnace door (2) and the furnace body (1); a trapezoidal horn-shaped smoke collection hood (5) is provided on the top of the furnace body (1), an internal circulation furnace chamber (4) is provided inside the furnace body (1), and several material trays (7) are provided inside the internal circulation furnace chamber (4), and a resistance strip (6) is buried at the bottom of the furnace body (1).

2. The impurity-enriching precious metal roasting furnace as described in claim 1, characterized in that, The furnace body (1) is constructed of fireproof bricks and ramming material, with an internal insulation layer. The walls of the furnace body (1) are 300mm thick, and the side walls of the split double-opening furnace door (2) are 200mm thick.

3. The impurity-enriching precious metal roasting furnace as described in claim 2, characterized in that, The split double-opening furnace door (2) is connected to the furnace body (1) by a spring hinge, and the split double-opening furnace door (2) is provided with a buckle at the closing point.

4. The impurity-enriching precious metal roasting furnace as described in claim 1, characterized in that, The internal circulation furnace cavity (4) is internally permeable and covered with insulation material.

5. A precious metal roasting furnace for clean impurity enrichment as described in claim 1, characterized in that, The trapezoidal flared smoke hood (5) has an angle of 35~55° with the furnace body.

6. The impurity-enriching precious metal roasting furnace as described in claim 1, characterized in that, The resistor strip (6) is distributed in a disc at the bottom of the furnace body (1), with a single power of 40KW. It adopts a Y connection method. The resistor strip lead rod (8) passes through the furnace body (1) and is protected by an insulating sheath. The opening of the resistor strip lead rod (8) is connected to the cable lug.

7. A precious metal roasting furnace for clean impurity enrichment as described in claim 6, characterized in that, The resistor strip (6) is made of Cr20Ni80 and its surface is coated with a ceramic-based anti-corrosion coating.

8. A precious metal roasting furnace for clean impurity enrichment as described in claim 1, characterized in that, The trays (7) are multiple sets that are evenly stacked.

9. A precious metal roasting furnace for clean impurity enrichment as described in claim 8, characterized in that, The material trays (7) consist of four groups of 32 trays (7).

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