Device and method for accelerating refining of gold-silver alloy

Abstract

The invention belongs to the technical field of precious metal recovery and purification, and particularly relates to a device and method for accelerating gold-silver alloy refining. The device comprises a refining furnace, a porous brick and a driving part, a feeding port is formed in one end of the refining furnace, a discharging port is formed in the side wall of the refining furnace, and a combustor is arranged at the other end of the refining furnace; a refractory layer is arranged on the inner side wall of the refining furnace, and an oxygen spray gun penetrating through the furnace wall and the refractory layer is arranged on the refining furnace; the porous brick is arranged at the bottom of the refining furnace, penetrates through the furnace wall and the refractory layer of the refining furnace, and is externally connected with nitrogen supply equipment; the driving part is arranged on the outer side of the refining furnace and used for driving the refining furnace to rotate. According to the method, nitrogen is injected into the gold-silver alloy melt in the refining furnace, so that the contact area of the gold-silver alloy melt and oxygen is increased, the refining speed of the gold-silver alloy is increased, the refining period of the gold-silver alloy is shortened, and the daily output is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of precious metal recovery and purification, and particularly relates to a device and method for accelerating the refining of gold-silver alloy. Background Art

[0002] Domestic precious metal smelting enterprises adopt the following methods for pyrometallurgical smelting of lead and copper anode mud: ① Two-stage furnace in one, that is, reduction smelting and oxidation refining are completed in one furnace; ② Reduction smelting and oxidation refining are separated, and these two processes are completed in two furnaces respectively; ③ Anode mud is melted in the side-blown furnace, the upper liquid is oxidized to remove antimony and arsenic in another furnace, and precious lead is oxidized and refined in the refining furnace, which is divided into three stages; ④ Anode mud reduction smelting is carried out in the bottom-blown precious lead furnace, the precious lead enters the silver separation furnace for oxidation refining, and the gold-silver alloy with a grade of about 60% is poured into the refining furnace for refining, which is divided into three stages.

[0003] During the redox smelting process of lead-copper anode mud in the bottom-blown furnace, the precious lead produced is rich in gold and silver, with a gold and silver content between 20% and 40%. The precious lead contains metals such as gold, silver, lead, antimony, tellurium, bismuth, and copper. The precious lead enters the silver separation furnace and undergoes one day of oxidation refining and impurity removal to produce an alloy. The alloy is poured into the refining furnace and continues to undergo about 4 days (96 hours) of oxidation refining and impurity removal to produce a gold-silver alloy suitable for silver electrolysis.

[0004] At present, in domestic precious metal smelting enterprises, there are two ways of top oxygen blowing or top compressed air blowing in the refining process of the refining furnace for alloys with a gold and silver grade of about 60%, and the method of removing impurities with auxiliary materials such as oxidants and alkalis is adopted. However, no matter which of the above methods is adopted, each refining furnace produces about 5 tons of gold and silver alloy with a grade of 97%, and its refining cycle is about 4 days (96h). The average daily output of gold and silver alloy is 1.25 tons, and it is difficult to further shorten the refining time. Obviously, the current method has the problems of long refining cycle and low daily output. Therefore, it is urgent to propose a device and method for accelerating the refining of gold and silver alloys to shorten the refining cycle of gold and silver alloys and increase their daily output. Summary of the invention

[0005] In order to solve the problems of long refining cycle and low daily output of gold-silver alloy with a grade of about 60% in the prior art, the present invention proposes a device and method for accelerating the refining of gold-silver alloy. The method increases the contact area between the gold-silver alloy melt and oxygen by injecting nitrogen into the gold-silver alloy melt in the refining furnace, accelerates the oxidation rate to slag, and further accelerates the refining speed of the gold-silver alloy, shortens the refining cycle of the gold-silver alloy, and improves the daily output.

[0006] To achieve the above purpose, the technical solution adopted is: The present invention provides a device for accelerating the refining of gold-silver alloy, comprising a refining furnace, a material feed port is provided at one end of the refining furnace, a material discharge port is provided on the side wall of the refining furnace, a burner is provided at the other end of the refining furnace, a refractory layer is provided on the inner wall of the refining furnace, and a driving member for driving the refining furnace to rotate is provided on the outer side of the refining furnace. The device is characterized in that porous bricks are inlaid at the bottom of the refining furnace, the porous bricks penetrate the furnace wall and the refractory layer of the refining furnace, and the porous bricks are externally connected to a nitrogen supply device.

[0007] According to the device for accelerating the refining of gold-silver alloys of the present invention, further, the extended line of the axis of the porous brick intersects with the extended line of the axis of the discharge port, and the angle of intersection is in the range of 130-140°.

[0008] According to the device for accelerating the refining of gold-silver alloys of the present invention, further, the refining furnace is provided with an oxygen lance penetrating the refining furnace wall and the refractory layer.

[0009] A method for accelerating the refining of gold-silver alloy is implemented based on the above-mentioned device for accelerating the refining of gold-silver alloy, comprising the following steps: a. Adding the gold-silver alloy melt into the refining furnace from the feed port to form a melt zone; The burner is turned on to introduce natural gas to heat the gold-silver alloy melt, and oxygen is injected into the refining furnace for oxidation reaction; at the same time, nitrogen is introduced through the nitrogen supply equipment, so that the gold-silver alloy melt forms a tumbling zone under the driving effect of nitrogen; b. During the oxidation reaction, impurities in the gold-silver alloy melt are oxidized to form an oxide slag layer, and the thickness of the oxide slag layer gradually increases; when the thickness of the oxide slag layer reaches a set thickness, the refining furnace is rotated to discharge the oxide slag from the discharge port; c. After the oxidized slag is discharged, the refining furnace is rotated and reset, and the oxidation reaction of the gold-silver alloy melt continues; d. Repeat steps b and c, the oxide slag is continuously discharged, and the gold and silver grade of the gold-silver alloy melt gradually increases; when the gold and silver grade reaches the set grade, the refining furnace is rotated to discharge the refined gold-silver alloy melt from the discharge port.

[0010] According to the method for accelerating the refining of gold-silver alloy of the present invention, further, the heating temperature in step a ranges from 800 to 1100°C.

[0011] According to the method for accelerating the refining of gold-silver alloys of the present invention, further, the injection flow rate of oxygen in step a is in the range of 30-80 m / s. 3 / h.

[0012] According to the method for accelerating the refining of gold-silver alloys of the present invention, further, the injection flow rate of the nitrogen in step a is in the range of 12-25 m / s. 3 / h.

[0013] According to the method for accelerating the refining of gold-silver alloys of the present invention, further, the cross-section of the tumbling zone in step a is arc-shaped, and the width of the arc-shaped cross-section ranges from 20 to 50 cm.

[0014] According to the method for accelerating the refining of gold-silver alloy of the present invention, further, the gold-silver grade of the gold-silver alloy melt added from the feed port in step a is 55-65%.

[0015] According to the method for accelerating the refining of gold-silver alloy of the present invention, further, in step d, the gold and silver grade of the refined gold-silver alloy melt discharged from the discharge port is set to 97%.

[0016] The beneficial effects achieved by adopting the above technical solution are: The present invention injects a steady nitrogen gas flow into the gold-silver alloy melt in the refining furnace to push the gold-silver alloy melt in the melt zone to move upward, thereby forming a stable tumbling zone, effectively increasing the contact area between the gold-silver alloy melt and oxygen, and increasing the reaction speed of oxidation into slag, thereby accelerating the refining speed of the gold-silver alloy, shortening the refining cycle of the gold-silver alloy, and increasing the daily output.

[0017] The nitrogen used in the present invention is an inert gas and will not affect the chemical reaction of the gold-silver alloy melt, thereby ensuring that the impurities in the gold-silver alloy melt are oxidized into slag smoothly.

[0018] Compared with traditional gold-silver alloy refining equipment, the oxygen spray gun in the present invention does not need to be inserted into the melt zone (the oxygen spray gun is arranged above the tumbling zone), thereby avoiding direct contact between the oxygen spray gun and the melt zone, preventing the oxygen spray gun from being corroded by the gold-silver alloy melt, increasing the service life of the oxygen spray gun, and reducing industrial production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention, wherein the drawings are only used to illustrate some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0020] Figure 1 It is a schematic structural diagram of the device for accelerating the refining of gold-silver alloys of the present invention in a refining state; Figure 2 It is a schematic structural diagram of the device for accelerating gold-silver alloy refining of the present invention in a discharging state.

[0021] The meanings of the numbers in the figure are: 1. Refining furnace, 101. Refractory layer, 102. Large toothed disc, 2. Discharge port, 3. Burner, 4. Feed port, 5. Oxygen spray gun, 6. Motor, 601. Small toothed disc, 7. Perforated bricks, 8. Support wheel, 9. Melt zone, 901. Oxidized slag layer, 902. Tumbling zone. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings of specific embodiments of the present invention to clearly and completely describe the exemplary scheme of the embodiment of the present invention. Unless otherwise defined, the technical terms or scientific terms used in the present invention should be the common meanings understood by people with ordinary skills in the field.

[0023] like Figure 1 and Figure 2 As shown, the device for accelerating the refining of gold-silver alloy of the present invention comprises a refining furnace 1, a feed port 4 is provided at one end of the refining furnace 1, a discharge port 2 is provided on the side wall of the refining furnace 1, a burner 3 is provided inside the other end of the refining furnace 1, a refractory layer 101 is provided on the inner wall of the refining furnace 1, a driving member for driving the refining furnace 1 to rotate is provided on the outer side of the refining furnace 1, porous bricks 7 are inlaid at the bottom of the refining furnace 1, the porous bricks 7 penetrate the furnace wall and the refractory layer of the refining furnace, and the porous bricks 7 are externally connected to a nitrogen supply device.

[0024] Furthermore, the discharge port 2 is also a smoke exhaust port, and the smoke generated during the refining process is discharged from the discharge port 2 into the dust collection system.

[0025] Furthermore, the refractory layer 101 is built of refractory bricks.

[0026] Furthermore, if Figure 1 As shown, the driving member is a motor 7, and a small toothed disc 601 is electrically connected to the motor 7; a large toothed disc 102 meshing with the small toothed disc 601 is provided on the outer side of the furnace wall of the refining furnace 1, and the motor 1 drives the refining furnace 1 to rotate through the small toothed disc 601 and the large toothed disc 102.

[0027] Furthermore, the porous bricks 7 are air-permeable bricks with uniform pores. Nitrogen is uniformly injected into the refining furnace 1 through the porous bricks 7 to improve the flow stability of nitrogen in the gold-silver alloy melt, thereby achieving precise control of the width w of the tumbling zone 902, and further achieving precise control of the refining process of the gold-silver alloy melt.

[0028] Furthermore, the nitrogen supply device can provide stable nitrogen to the refining furnace 1 through the porous bricks 7, and the nitrogen supply device controls the pressure and flow of the nitrogen through the pressure reducing valve and the needle valve, and the pressure and flow of the nitrogen can be adjusted according to actual conditions.

[0029] Furthermore, a supporting wheel 8 is installed at the bottom of the refining furnace 1 to assist the motor 6 in driving the refining furnace 1 to rotate.

[0030] like Figure 1 As shown, the extended axis line of the porous brick 7 intersects with the extended axis line of the discharge port 2, and the intersection angle range a is 130-140°, preferably, the angle a is 135°.

[0031] like Figure 1 As shown, the refining furnace 1 is provided with an oxygen lance 5 penetrating the refining furnace wall and the refractory layer 101, and the oxygen lance 5 is externally connected to an oxygen supply device.

[0032] It should be understood that if Figure 1 As shown, compared with the traditional gold-silver alloy refining equipment, the oxygen spray gun 5 in the present invention does not need to be inserted into the melt zone 9 (the oxygen spray gun 5 is arranged on the side wall of the refining furnace 1 above the tumbling zone 9), thereby avoiding direct contact between the oxygen spray gun 5 and the gold-silver alloy melt, thereby preventing the gold-silver alloy melt from corroding the oxygen spray gun 5.

[0033] The method for accelerating the refining of gold-silver alloy implemented by the device for accelerating the refining of gold-silver alloy according to Example 1 of the present invention comprises the following specific steps: a. Add the gold-silver alloy melt into the refining furnace 1 from the feed port 2 to form a melt zone 9; after the gold-silver alloy melt is added, turn on the burner 3 to heat the gold-silver alloy melt, and inject oxygen and nitrogen into the refining furnace 1 from the oxygen spray gun 5 and the porous brick 7 respectively. The gold-silver alloy melt in the melt zone 9 continuously rolls upward under the driving effect of nitrogen, forming a stable rolling zone 902; b. Impurities in the upper liquid of the gold-silver alloy melt are gradually oxidized in a high temperature environment to form an oxide slag layer 901. As the oxidation reaction proceeds, the thickness of the oxide slag layer 901 gradually increases. When the thickness of the oxide slag layer 901 reaches a set thickness, the motor 6 drives the refining furnace 1 to rotate until the height of the discharge port 2 is slightly lower than the height of the oxide slag layer 901, so that the oxide slag is discharged from the discharge port 2 and enters the subsequent slag bag. c. After the oxidized slag is completely discharged, the refining furnace 1 is rotated and reset, and the oxidation reaction of the upper liquid of the gold-silver alloy melt continues; d. Repeat steps b and c, the oxide slag formed by oxidation is continuously discharged from the discharge port 2, and the gold and silver grade of the gold-silver alloy melt gradually increases; when the gold and silver grade of the gold-silver alloy melt reaches the set grade, the refining furnace 1 is rotated to discharge the refined gold-silver alloy melt from the discharge port 2 and flow into the subsequent mold.

[0034] Furthermore, in step a, the burner 3 uses natural gas to heat the interior of the smelting furnace 1, and the heating temperature ranges from 800 to 1100°C.

[0035] Furthermore, the injection flow rate of oxygen in step a is in the range of 30-80m 3 / h, and the oxygen is diffused in the refining furnace 1.

[0036] Furthermore, the injection flow rate of nitrogen in step a is in the range of 12-25m 3 / h.

[0037] Furthermore, if Figure 1 As shown, in step a, the cross section of the tumbling zone 902 is arc-shaped, and the width w of the arc-shaped cross section ranges from 20 to 50 cm.

[0038] It should be understood that during the refining process, the nitrogen supply equipment continuously injects a stable nitrogen flow from the vent 7 into the refining furnace 1, so the gold-silver alloy melt in the melt zone 9 will continuously roll upward under the impetus of the nitrogen, thereby forming a stable tumbling zone 902.

[0039] Furthermore, the gold-silver grade of the gold-silver alloy melt added from the feed port in step a is 55-65%, and preferably, the gold-silver grade of the added gold-silver alloy melt is 60%.

[0040] Furthermore, in step b, the thickness of the slag layer 901 is set to 5 cm.

[0041] Furthermore, the impurities in the upper layer of the gold-silver alloy melt in step b include metals such as antimony, lead, tellurium, bismuth, and copper. These impurities are oxidized into slag in a high-temperature environment and float on the melt area 9, gradually accumulating and increasing to form an oxide slag layer 901.

[0042] Furthermore, each time the oxidized slag is discharged in step b, the burning degree of the porous bricks 7 needs to be observed and the porous bricks 7 need to be replaced in time.

[0043] Furthermore, in step d, the gold and silver grade of the refined gold-silver alloy melt discharged from the discharge port 2 is set to 97%.

[0044] It should be understood that during the refining process, the upper liquid layer of the gold-silver alloy melt gradually oxidizes in a high temperature environment to form an oxide slag layer 901. The presence of the oxide slag layer 901 reduces the contact area between oxygen and the melt region (below the oxide slag layer 901), thereby reducing the speed at which impurities in the gold-silver alloy melt oxidize into slag. However, in the present invention, if Figure 1 As shown, nitrogen continuously pushes the gold-silver alloy melt in the melt zone 9 to stir and tumble upward, forming a stable tumbling zone 902. The main substance in the tumbling zone 902 is the gold-silver alloy melt, ensuring sufficient contact between the gold-silver alloy melt and oxygen, so as to increase the speed at which impurities in the gold-silver alloy melt are oxidized into slag, thereby accelerating the refining process of the gold-silver alloy melt.

[0045] Furthermore, if Figure 2As shown, when discharging the slag of the slag layer 901, the motor needs to be started to rotate the refining furnace 1 to drive the discharge port 2 to rotate downward. At this time, the height of the discharge port 2 needs to be controlled to be slightly lower than the height of the slag layer to ensure that the slag can flow out smoothly from the discharge port 2; at the same time, the position of the porous brick 7 needs to be higher than the height of the slag layer 901 to avoid nitrogen blowing the slag, ensure the flow stability of the slag, so that the slag can be discharged smoothly from the discharge port 2 to avoid splashing of the slag and the gold-silver alloy melt entrained therein.

[0046] Similarly, if Figure 2 As shown, when discharging the gold-silver alloy melt after refining, it is also necessary to rotate the refining furnace 1 and control the position of the porous bricks 7 to be higher than the height of the melt zone 9, so that the refined gold-silver alloy melt can be discharged smoothly from the discharge port 2 to avoid splashing of the gold-silver alloy melt.

[0047] Embodiment 1: The contents of each component of the refined gold-silver alloy liquid in this embodiment are as follows: gold Au: 0.72%, silver Ag: 55%, antimony Sb: 0.46%, lead Pb: 6.4%, tellurium Te: 2.98%, bismuth Bi: 29%, copper Cu: 3.3%. The refined gold-silver alloy liquid comes from the silver separation furnace in the previous work.

[0048] 10t of gold-silver alloy liquid with a gold-silver grade of 55.72% is added into the refining furnace 1 from the feed port 4; Oxygen spray gun 5 injects oxygen, and the flow rate of oxygen is 30-60m 3 / h; the nitrogen supply equipment injects nitrogen into the refining furnace 1 through the porous brick 7 (specifically: by controlling the pressure reducing valve, the nitrogen pressure is initially controlled at 0.5Mpa, and the nitrogen pressure is fine-tuned to 0.3Mpa through the needle valve, and the nitrogen flow rate is 15m 3 / h), so that a stable tumbling zone 902 is formed on the melt zone 9, and the width w of the tumbling zone 902 is 20-40 cm; ① Remove impurities of lead and antimony: Control the temperature in the refining furnace 1 to 800-950℃ and perform refining for 8 hours. Lead and antimony elements are oxidized in the high temperature environment in the refining furnace 1 (part of the bismuth element is also oxidized), generating flue gas, lead slag PbO, antimony slag Sb 2 O 3 (and a small amount of bismuth slag Bi 2 O 3 ), wherein the flue gas is discharged from the discharge port 2 and enters the subsequent dust collection system, and the lead slag, antimony slag (and bismuth slag) are discharged from the discharge port 2 and enter the subsequent slag bag; after removing the lead and antimony elements, the main components of the alloy melt become gold, silver, copper, bismuth and tellurium.

[0049] ② Removing tellurium impurities: Control the temperature in the refining furnace 1 to 900-1050°C, add 800kg of slag-making auxiliary materials into the refining furnace 1 from the feed port 4, the slag-making auxiliary materials include but are not limited to sodium hydroxide, sodium carbonate, potassium nitrate, etc., continue refining for 16 hours, sodium hydroxide or sodium carbonate reacts with oxygen and tellurium elements to produce tellurium slag Na 2 TeO 3 The tellurium slag is discharged from the discharge port 2 and enters the subsequent slag bag (a small amount of bismuth metal will be entrained in the tellurium slag during the discharge process). After the tellurium element is removed, the main components of the alloy melt become gold, silver, copper and bismuth.

[0050] ③ Remove bismuth impurities: Control the temperature in the refining furnace 1 to 800-950℃, continue refining for 12 hours, and the bismuth element will generate bismuth slag Bi in the high temperature environment in the refining furnace 1 2 O 3 , the bismuth slag is discharged from the discharge port 2 and enters the subsequent slag bag (a small amount of gold and silver will be entrained when the bismuth slag is discharged); after removing the bismuth element, the main components of the alloy melt become gold, silver and copper.

[0051] ④ Remove impurity copper, control the temperature in the refining furnace 1 to 950-1100℃, add 300kg of slag-making auxiliary materials into the refining furnace 1 from the feed port 4, the slag-making auxiliary materials include but are not limited to sodium carbonate, potassium nitrate, etc., continue refining for 12 hours, the copper element generates copper slag CuO in the high temperature environment in the refining furnace 1, the copper slag is discharged from the discharge port 2 and enters the subsequent slag bag (a small amount of gold and silver will be entrained when the copper slag is discharged); after removing the copper element, the main components of the alloy melt become gold and silver.

[0052] At this point, the refining of the gold-silver alloy melt is completed, and then the refined gold-silver alloy melt is poured into a subsequent mold through the discharge port 2.

[0053] In this Example 1, including the operating time of the equipment, the final refining time is 53 hours, the refined amount of gold-silver alloy is 5.1 tons, and the average daily output is 2.3 tons.

[0054] Embodiment 2: The contents of each component of the refined gold-silver alloy liquid in this embodiment are as follows: gold Au: 0.85%, silver Ag: 65%, antimony Sb: 0.049%, lead Pb: 0.32%, tellurium Te: 4.21%, bismuth Bi: 27%, copper Cu: 1.65%. The refined gold-silver alloy liquid comes from the silver separation furnace in the previous work.

[0055] 11t of gold-silver alloy liquid with a gold-silver grade of 65.85% is added to the refining furnace 1 from the feed port 4; Oxygen is injected into the oxygen spray gun 5, and the flow rate of oxygen is 30-60m 3 / h; the nitrogen supply equipment injects nitrogen into the refining furnace 1 through the porous brick 7 (specifically: by controlling the pressure reducing valve, the nitrogen pressure is initially controlled at 0.5Mpa, and the nitrogen pressure is fine-tuned to 0.3Mpa through the needle valve, and the nitrogen flow rate is 15m 3 / h), so that a stable tumbling zone 902 is formed on the melt zone 9, and the width w of the tumbling zone 902 is 20-40 cm; ① Remove impurities of lead and antimony: Control the temperature in the refining furnace 1 to 800-950℃ and perform refining for 8 hours. Lead and antimony elements are oxidized in the high temperature environment in the refining furnace 1 (part of the bismuth element is also oxidized), generating flue gas, lead slag PbO, antimony slag Sb 2 O 3 (and a small amount of bismuth slag Bi 2 O 3 ), wherein the flue gas is discharged from the discharge port 2 and enters the subsequent dust collection system, and the lead slag, antimony slag (and bismuth slag) are discharged from the discharge port 2 and enter the subsequent slag bag; after removing the lead and antimony elements, the main components of the alloy melt become gold, silver, copper, bismuth and tellurium.

[0056] ② Remove tellurium impurities: Control the temperature in the refining furnace 1 to 900-1050°C, add 900kg of slag-making auxiliary materials into the refining furnace 1 from the feed port 4, the slag-making auxiliary materials include but are not limited to sodium hydroxide, sodium carbonate, potassium nitrate, etc., continue refining for 12 hours, sodium hydroxide or sodium carbonate reacts with oxygen and tellurium element to produce tellurium slag Na 2 TeO 3 , the tellurium slag is discharged from the discharge port 2 and enters the subsequent slag bag (a small amount of bismuth metal will be entrained in the tellurium slag during the discharge process); after the tellurium element is removed, the main components of the alloy melt become gold, silver, copper and bismuth.

[0057] ③ Remove bismuth impurities: Control the temperature in the refining furnace 1 to 800-950℃, continue refining for 16 hours, and the bismuth element will generate bismuth slag Bi in the high temperature environment in the refining furnace 1 2 O 3 , the bismuth slag is discharged from the discharge port 2 and enters the subsequent slag bag (a small amount of gold and silver will be entrained when the bismuth slag is discharged); after removing the bismuth element, the main components of the alloy melt become gold, silver and copper.

[0058] ④ Remove impurity copper, control the temperature in the refining furnace 1 to 950-1100℃, add 350kg of slag-making auxiliary materials into the refining furnace 1 from the feed port 4, the slag-making auxiliary materials include but are not limited to sodium carbonate, potassium nitrate, etc., continue refining for 12 hours, the copper element generates copper slag CuO in the high temperature environment in the refining furnace 1, and the copper slag is discharged from the discharge port 2 and enters the subsequent slag bag; after removing the copper element, the main components of the alloy melt become gold and silver.

[0059] At this point, the refining of the gold-silver alloy melt is completed, and then the refined gold-silver alloy melt is poured into a subsequent mold through the discharge port 2.

[0060] In this Example 2, the final refining time is 50 hours, including the operating time of the equipment, and the refined amount of gold-silver alloy is 6.8 tons, with an average daily output of 3.26 tons.

[0061] Embodiment 3: The contents of each component of the refined gold-silver alloy liquid in this embodiment are as follows: gold Au: 0.84%, silver Ag: 60%, antimony Sb: 0.012%, lead Pb: 0.56%, tellurium Te: 3.61%, bismuth Bi: 32.6%, copper Cu: 2.08%. The refined gold-silver alloy liquid comes from the silver separation furnace in the previous work.

[0062] 8 tons of gold-silver alloy liquid with a gold-silver grade of 60.84% ​​is added into the refining furnace 1 from the feed port 4; Oxygen is injected into the oxygen spray gun 5, and the flow rate of oxygen is 30-60m 3 / h; the nitrogen supply equipment injects nitrogen into the refining furnace 1 through the porous brick 7 (specifically: by controlling the pressure reducing valve, the nitrogen pressure is initially controlled at 0.5Mpa, and the nitrogen pressure is fine-tuned to 0.3Mpa through the needle valve, and the nitrogen flow rate is 15m 3 / h, so that a stable tumbling zone 902 is formed on the melt zone 9, and the width w of the tumbling zone 902 is 20-40 cm; ① Remove impurities of lead and antimony: Control the temperature in the refining furnace 1 to 800-950℃ and perform refining for 8 hours. Lead and antimony elements are oxidized in the high temperature environment in the refining furnace 1 (part of the bismuth element is also oxidized), generating flue gas, lead slag PbO, antimony slag Sb 2 O 3 (and a small amount of bismuth slag Bi 2 O 3 ), wherein the flue gas is discharged from the discharge port 2 and enters the subsequent dust collection system, and the lead slag, antimony slag (and bismuth slag) are discharged from the discharge port 2 and enter the subsequent slag bag; after removing the lead and antimony elements, the main components of the alloy melt become gold, silver, copper, bismuth and tellurium.

[0063] ② Removing tellurium impurities: Control the temperature in the refining furnace 1 to 900-1050°C, add 700kg of slag-making auxiliary materials into the refining furnace 1 from the feed port 4, the slag-making auxiliary materials include but are not limited to sodium hydroxide, sodium carbonate, potassium nitrate, etc., continue refining for 10 hours, sodium hydroxide or sodium carbonate reacts with oxygen and tellurium elements to produce tellurium slag Na 2 TeO 3, the tellurium slag is discharged from the discharge port 2 and enters the subsequent slag bag (a small amount of bismuth metal will be entrained in the tellurium slag during the discharge process); after the tellurium element is removed, the main components of the alloy melt become gold, silver, copper and bismuth.

[0064] ③ Remove bismuth impurities: Control the temperature in the refining furnace 1 to 800-950℃, continue refining for 16 hours, and the bismuth element will generate bismuth slag Bi in the high temperature environment in the refining furnace 1 2 O 3 The bismuth slag is discharged from the discharge port 2 and enters the subsequent slag bag (a small amount of gold and silver will be entrained when the bismuth slag is discharged); after removing the bismuth element, the main components of the alloy melt become gold, silver and copper.

[0065] ④ Remove impurity copper, control the temperature in the refining furnace 1 to 950-1100℃, add 250kg of slag-making auxiliary materials into the refining furnace 1 from the feed port 4, the slag-making auxiliary materials include but are not limited to sodium carbonate, potassium nitrate, etc., continue refining for 14 hours, the copper element generates copper slag CuO in the high temperature environment in the refining furnace 1, and the copper slag is discharged from the discharge port 2 and enters the subsequent slag bag; after removing the copper element, the main components of the alloy melt become gold and silver.

[0066] At this point, the refining of the gold-silver alloy melt is completed, and then the refined gold-silver alloy melt is poured into a subsequent mold through the discharge port 2.

[0067] In this Example 3, the final refining time is 50 hours, including the operating time of the equipment, and the refined amount of gold-silver alloy is 4.4 tons, with an average daily output of 2.1 tons.

[0068] The technical solution of the present invention is described above in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

[0069] In the description of the present invention, it should be understood that the expressions “first” and “second” are used to describe the various elements of the present invention and do not represent any limitation of order, quantity or importance, but are only used to distinguish one component from another.

[0070] It should be noted that when one element is “connected”, “coupled” or “connected” to another element, it may mean that they are directly connected, coupled or connected, but it should be understood that there may be intermediate elements between the two; that is, the positional relationships of direct connection and indirect connection are covered.

[0071] It should be noted that the use of "a" or "an" and similar words does not necessarily indicate a quantitative limitation. "Include" or "comprising" and similar words mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects.

[0072] It should be noted that terms such as "up", "down", "left" and "right" indicating orientation or positional relationship are only used to indicate relative positional relationship. This is for the convenience of describing the present invention and does not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0073] The preferred embodiments for implementing the present invention have been described in detail above, but it should be understood that the role of these embodiments is only to exemplify, and is not intended to limit the scope, applicability or configuration of the present invention in any way. The protection scope of the present invention is defined by the attached claims and their equivalents. A person of ordinary skill in the art can make many changes to the above embodiments under the guidance of the present invention, and these changes all fall within the protection scope of the present invention.

Claims

1. A device for accelerating the refining of gold and silver alloys, comprising a refining furnace, a feed inlet is provided at one end of the refining furnace, a discharge port is provided on the side wall of the refining furnace, a burner is provided at the other end of the refining furnace, a refractory layer is provided on the inner side wall of the refining furnace, and a driving member for driving the refining furnace to rotate is provided on the outer side of the refining furnace, characterized in that: The bottom of the refining furnace is inlaid with porous bricks, which penetrate the furnace wall and the refractory layer of the refining furnace, and the porous bricks are externally connected with nitrogen supply equipment.

2. The device for accelerating the refining of gold-silver alloy according to claim 1, characterized in that: The extended line of the axis of the porous brick intersects with the extended line of the axis of the discharge port, and the angle of intersection is in the range of 130-140°.

3. The device for accelerating the refining of gold-silver alloy according to claim 1, characterized in that: The refining furnace is provided with an oxygen spray gun penetrating the refining furnace wall and the refractory layer.

4. A method for accelerating the refining of gold-silver alloy, characterized in that: The device for accelerating the refining of gold-silver alloy according to any one of claims 1 to 3 is implemented, comprising the following steps: a. Adding the gold-silver alloy melt into the refining furnace from the feed port to form a melt zone; The burner is turned on to introduce natural gas to heat the gold-silver alloy melt, and oxygen is injected into the refining furnace for oxidation reaction; at the same time, nitrogen is introduced through the nitrogen supply equipment, so that the gold-silver alloy melt forms a tumbling zone under the driving effect of nitrogen; b. During the oxidation reaction, impurities in the gold-silver alloy melt are oxidized to form an oxide slag layer, and the thickness of the oxide slag layer gradually increases; when the thickness of the oxide slag layer reaches a set thickness, the refining furnace is rotated to discharge the oxide slag from the discharge port; c. After the oxidized slag is discharged, the refining furnace is rotated and reset, and the oxidation reaction of the gold-silver alloy melt continues; d. Repeat steps b and c, the oxide slag is continuously discharged, and the gold and silver grade of the gold-silver alloy melt gradually increases; when the gold and silver grade reaches the set grade, the refining furnace is rotated to discharge the refined gold-silver alloy melt from the discharge port.

5. The method for accelerating the refining of gold-silver alloy according to claim 4, characterized in that: The heating temperature in step a ranges from 800 to 1100°C.

6. The method for accelerating the refining of gold-silver alloy according to claim 4, characterized in that: The oxygen injection flow rate in step a is in the range of 30-80m 3 / h.

7. The method for accelerating the refining of gold-silver alloy according to claim 4, characterized in that: The nitrogen injection rate in step a is in the range of 12-25m 3 / h.

8. The method for accelerating the refining of gold-silver alloy according to claim 4, characterized in that: The cross section of the tumbling zone in step a is arc-shaped, and the width of the arc-shaped cross section ranges from 20 to 50 cm.

9. The method for accelerating the refining of gold-silver alloy according to claim 4, characterized in that: The gold-silver grade of the gold-silver alloy melt added from the feed port in step a is 55-65%.

10. The method for accelerating the refining of gold-silver alloy according to claim 4, characterized in that: In step d, the gold and silver grade of the refined gold-silver alloy melt discharged from the discharge port is set to 97%.

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