Device and method for treating inorganic nonmetal impurities in silver material

Abstract

The invention discloses a device and a method for treating inorganic nonmetal impurities in a silver material. The device comprises a vacuum chamber, an induction melting furnace, a mold, a heating chamber and a turntable, the induction melting furnace, the heating chamber and the rotating disc are all arranged in the vacuum chamber. A silver block is put into an induction melting furnace to be melted, molten liquid reaches a certain temperature, the molten liquid is poured into a mold preheated in a heating chamber in advance, the mold is transferred into the heating chamber, heat preservation and standing are conducted for a certain time, the mold is transferred out of the heating chamber, the molten liquid is taken out after being solidified, the solidified face is milled by a certain thickness, and the silver material with the extremely low inorganic nonmetal impurity content is obtained. Through the combination of smelting of the induction smelting furnace and the heating chamber, the production efficiency is improved, the floating time and floating efficiency of impurities in heat preservation standing impurity removal are guaranteed, and the content of inorganic nonmetal impurities in the treated silver material is reduced by 90% compared with that of untreated silver materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of silver-based material preparation, and particularly relates to a device and method for treating inorganic non-metallic impurities in silver materials. Background Art

[0002] In the quartz crystal industry, silver-based materials are divided into sputtering silver targets and evaporated silver particles. These two materials are used to coat silver on quartz wafers through special coating technologies. The main functions of the silver layer are to conduct electricity and slightly adjust the wafer frequency. The type and content of impurities in the silver layer have a direct impact on the thickness consistency and surface morphology of the silver layer. Especially during evaporation coating, after the silver particles melt, the impurities float on the surface of the silver melt, affecting the uniform evaporation of silver. According to practical experience, the area of inorganic non-metallic impurities should be less than 0.5 cm 2 , in order to meet the requirements of evaporation coating. The type of impurities that most affect the product performance is inorganic non-metallic impurities, mainly including sodium silicate, aluminum silicate, silicon oxide, aluminum oxide, etc.

[0003] Removing inorganic non-metallic impurities from silver materials in the industry is a difficult problem. The common impurity removal methods in the prior art are as follows: One is to use repeated melting to remove some impurities. The impurity removal ratio generally remains at about 50%. And because this type of melting furnace generally uses a silicon carbide graphite crucible, some impurities such as silicon carbide will be newly introduced during the melting process; Another is to use high-temperature casting and extend the solidification time, which can also remove some impurities, but there are problems such as excessive silver loss at too high temperatures; There is also a method of atmosphere heating melting, directly putting silver into a mold and melting and solidifying it in an atmosphere environment. The material processing cycle is long. When heating and melting in an atmosphere, the heating and cooling of the furnace and the heating of the material are all long processes, which is not conducive to industrial production, and is accompanied by an increase in energy consumption, resulting in an increase in processing costs.

[0004] In the prior art, an induction melting furnace is also used to remove metal impurities. After the induction melting furnace finishes melting, the molten metal is poured into a mold for solidification. First, when the molten metal is poured into the mold, the temperature gradient between the metal melt and the mold is large, and the surface of the metal melt will quickly solidify, forming a thin solid shell, which exacerbates the residue of impurities in the solidified metal. Second, after the molten metal is poured into the mold, it solidifies at room temperature, and the temperature of the molten metal quickly drops to the solidification temperature. The time of this solidification stage is very short, and the impurities will be directly "frozen" in the solidified metal matrix. The inorganic non-metallic impurities do not have enough time to aggregate and float to the surface of the melt, resulting in a higher impurity content in the final product. Summary of the Invention

[0005] In view of the technical problem that in the existing method for removing impurities from silver-based materials in an induction melting furnace, inorganic non-metallic impurities do not have enough time to aggregate and float to the surface of the molten liquid, the present invention provides a treatment device and method for inorganic non-metallic impurities in silver materials. After melting in the induction melting furnace, it enters the heating chamber for heat preservation and static settlement. The combination of the two speeds up the production efficiency of removing inorganic non-metallic impurities in silver materials and ensures the floating time and floating efficiency of impurities during impurity removal, reducing the content of inorganic non-metallic impurities in the treated silver materials by 90% compared with the untreated ones.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A treatment device for inorganic non-metallic impurities in silver materials includes a vacuum chamber, an induction melting furnace, a mold, and further includes a heating chamber and a turntable;

[0008] The induction melting furnace, the heating chamber, and the turntable are all arranged in the vacuum chamber; the heating chamber and the turntable are located on one side of the induction melting furnace;

[0009] The heating chamber is provided with an opening one for the turntable to pass through, and a part of the turntable body is located in the heating chamber;

[0010] The mold is arranged on the turntable, and the heating chamber is provided with two opening twos for the mold to penetrate in and out;

[0011] The induction melting furnace is rotatably arranged in the vacuum chamber, and the feeding port of the mold and the discharging port of the induction melting furnace are correspondingly arranged.

[0012] Furthermore, a power mechanism is arranged at the bottom of the turntable. The power mechanism includes a first motor and a speed reducer. The motor and the speed reducer are both located outside the vacuum chamber. The output end of the speed reducer passes through the vacuum chamber and is fixed to the bottom of the turntable. The motor transmits power to the turntable through the speed reducer and drives the turntable to rotate.

[0013] Furthermore, at least two vertical baffles are arranged on the turntable, and the baffles are matched with the opening twos on the heating chamber.

[0014] Furthermore, the gap between the baffle and the side wall of the opening two of the heating chamber is less than 3 mm.

[0015] Furthermore, the material of the baffle is alumina heat-insulating refractory brick, and the thickness is not less than 3 cm.

[0016] Furthermore, both the mold and the crucible of the induction melting furnace are made of graphite material.

[0017] Furthermore, the treatment device further includes a gas storage tank and a vacuum pump.

[0018] Furthermore, the present application also provides a method for treating inorganic non-metallic impurities in silver materials, comprising the following steps:

[0019] S1: Open the vacuum chamber. After sanding the surface of the standard silver ingot, cut it into silver blocks, put the silver blocks into the induction melting furnace, and place the mold on the turntable.

[0020] S2: Close the vacuum chamber. First, evacuate to 0.1 MPa, and then fill with argon to normal pressure.

[0021] S3: Rotate the turntable to transfer the mold into the heating chamber, and heat the temperature in the heating chamber to 1050 °C - 1150 °C.

[0022] S4: Start the induction melting furnace to start melting the silver blocks. After the induction melting furnace reaches 1100 °C - 1200 °C, keep it warm for 2 min - 5 min.

[0023] S5: After step 4 is completed, rotate the turntable to transfer the mold out of the heating chamber, tilt the induction melting furnace, pour the molten silver in the induction melting furnace into the mold. After pouring, rotate the turntable to transfer the mold into the heating chamber and let it stand still for 4 min - 10 min. Then rotate the turntable again to transfer the mold out of the heating chamber to cool and solidify the silver melt in the mold, obtaining a solidified silver block.

[0024] S6: Milling 2 mm - 5 mm from the upper surface of the solidified silver block, and then the silver material with treated inorganic non-metallic impurities is obtained.

[0025] Furthermore, when the mold is transferred into the heating chamber in S3, the heating time at 1050 °C - 1150 °C is not less than 20 min.

[0026] Through the above technical solutions, the beneficial effects of the present invention are as follows:

[0027] 1. In the present application, the molten metal after induction melting is introduced into the heated mold, and the mold containing the molten metal quickly enters the heating chamber through the turntable for heat preservation. The heating chamber is used to heat up the graphite mold before adding the melt and keep it warm after adding the molten metal. Heating the mold before adding the melt makes the mold have a temperature similar to that of the molten metal, avoiding too large a temperature difference between the molten metal and the mold when pouring the molten metal into the mold, and directly starting the solidification process; after adding the molten metal to the mold, transfer the mold into the heating chamber for heat preservation, ensuring that the ambient temperature of the mold is close to the melting temperature, and preventing the impurities from starting to solidify before they are completely floated up due to too large a temperature difference between the mold and the environment. In summary, in the present application, through the combination of the induction melting furnace and the heating chamber, the entire solidification time is delayed, ensuring the floating time and floating efficiency of the non-metallic impurities, and reducing the content of inorganic non-metallic impurities in the treated silver material by 90% compared with the untreated one.

[0028] 2. In the prior art, the method of atmosphere heating and melting is adopted. The silver is directly placed into the mold, melted in the argon atmosphere environment in the mold, and then cooled down to solidify the silver melt in the mold. During this process, the heating and cooling of the furnace and the heating of the material are both time-consuming. However, the design of separating the induction melting furnace and the heating chamber in this application ensures the impurity removal efficiency while also guaranteeing the production efficiency and saving the processing cycle of the silver material.

[0029] 3. Both the mold and the crucible of the induction melting furnace in this application adopt graphite molds, which do not introduce other impurities during the casting process. Just slightly milling the solidified surface where non-metallic impurities gather on the mold can obtain silver materials with ideal effects, increasing the material yield rate of the casting product by 5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram inside the device of this application;

[0031] Figure 2 is a schematic structural diagram of the turntable and the heating chamber of this application;

[0032] Figure 3 is a schematic structural diagram of the rotating structure of the induction furnace of this application;

[0033] The reference numerals in the drawings are: 1, vacuum chamber; 2, induction melting furnace; 3, heating chamber; 4, turntable, 401, positioning pin; 402, baffle; 5, mold; 6, observation window; 7, vacuum pump; 8, first motor; 9, first rotating shaft; 10, second motor; 11, gas storage tank; 12, speed reducer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In the following, the exemplary solutions of the embodiments of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meaning understood by those of ordinary skill in the art.

[0035] 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.

[0036] It should be noted that when an element is described as having a "connection", "coupling", or "connection" with another element, it may mean a direct connection, coupling, or connection, but it should be understood that there may be an intermediate element between the two; that is, it covers the positional relationship of direct connection and indirect connection.

[0037] It should be noted that the use of words such as "a" or "an" does not necessarily imply a quantitative limitation. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects.

[0038] It should be noted that terms indicating orientation or positional relationship such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, which are for the convenience of describing the present invention, rather than the device or element being referred to 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.

[0039] Please refer to Figures 1-3 , now a device for treating inorganic non-metallic impurities in silver material provided by the present invention will be described. A device for treating inorganic non-metallic impurities in silver material includes a vacuum chamber 1, an induction melting furnace 2, a mold 5, and also includes a heating chamber 3 and a turntable 4; the induction melting furnace 2, the heating chamber 3, and the turntable 4 are all arranged in the vacuum chamber 1; the heating chamber 3 and the turntable 4 are located on one side of the induction melting furnace 2; the heating chamber 3 is provided with an opening one for the turntable 4 to pass through, and a part of the turntable body is located in the heating chamber 3; the mold 5 is arranged on the turntable, and the heating chamber 3 is provided with two opening twos for the mold 5 to penetrate in and out; the induction melting furnace 2 is rotatably arranged in the vacuum chamber 1, and the feeding port of the mold 5 and the discharging port of the induction melting furnace 2 are correspondingly arranged.

[0040] The turntable 4 of the present application has sufficient strength to withstand the stress caused by placing items on one side, and the rotating shaft can withstand the bending stress generated by the unilateral load of the turntable. In the present application, the mold 5 is fixed on the turntable 4 through a positioning pin 401, which is convenient for taking the mold 5.

[0041] The induction melting furnace 2 of the present application is rotatably arranged in the vacuum chamber 1 through a rotating assembly. The rotating assembly includes a second motor 10, a rotating shaft 9, and a support frame. The induction melting furnace 2 is fixed on the support frame. One side of the support frame is fixed to one end of the rotating shaft 9, and the other end of the rotating shaft 9 passes through the vacuum chamber 1 and is fixed to the output end of the second motor 10. The model of the induction melting furnace is RVI-10, produced by Shenyang Hengjin Vacuum Technology Co., Ltd. The rotating assembly enables the induction melting furnace 2 to pour molten metal liquid into the mold 5 by rotation.

[0042] The heating chamber 3 adopts an existing heating and heat preservation device, or resistance wires are arranged inside the heating chamber 3 to achieve heating. The resistance wires are arranged on the inner wall of the heating chamber. Specifically, the selected surface of the inner wall of the heating chamber is the upper surface, the lower surface, the left and right surfaces, and no heating wires are arranged on the front and back surfaces.

[0043] Further, a power mechanism is provided at the bottom of the turntable 4. The power mechanism includes a first motor 8 and a speed reducer 12. Both the first motor 8 and the speed reducer 12 are located outside the vacuum chamber 1. The output end of the speed reducer 12 passes through the vacuum chamber 1 and is fixed to the bottom of the turntable 4. The first motor 8 transmits power to the turntable 4 through the speed reducer 12 and drives the turntable 4 to rotate. The first motor 8 is a servo motor, and the speed reducer 2 is a planetary speed reducer;

[0044] Further, four vertical baffles 402 are provided on the turntable 4, and the baffles 402 are matched with the second opening of the heating chamber 3. The gap between the baffle 402 and the side wall of the second opening of the heating chamber 3 is less than 3 mm. The baffle 402 is made of alumina heat-insulating refractory brick, and the thickness is not less than 3 cm.

[0045] Further, both the mold 5 and the crucible of the induction melting furnace 2 are made of graphite.

[0046] Further, the processing device further includes an air storage tank 11 and a vacuum pump 7. The vacuum pump 7 is used to evacuate the inside of the vacuum chamber. The air storage tank 11 is an argon gas cylinder. A valve is provided at the outlet of the argon gas cylinder, and argon gas enters the vacuum chamber through a pipeline to provide an argon gas environment for the vacuum chamber.

[0047] Compared with the prior art, the processing device for inorganic non-metallic impurities in silver materials provided by the present invention adopts an induction melting chamber and a heating chamber for heating the mold and standing the molten metal in the vacuum cavity of the vacuum chamber, effectively prolonging the solidification time and reducing the convection and flow inside the molten silver solution solidified in the mold, so that the inorganic non-metallic impurities have enough time to aggregate and float to the surface of the molten solution.

[0048] Based on the same inventive concept, the present invention also provides a method for treating inorganic non-metallic impurities in silver materials, using the above-mentioned processing device for inorganic non-metallic impurities in silver materials. The method includes the following steps:

[0049] S1: Open the vacuum chamber. After sandblasting the surface of the standard silver ingot, cut it into silver blocks, put the silver blocks into the induction melting furnace 2, and place the mold 5 on the turntable 4;

[0050] S2: Close the vacuum chamber 1, first evacuate to 0.1 MPa, and then fill with argon gas to normal pressure;

[0051] S3: Rotate the turntable 4 to transfer the mold 5 into the heating chamber 3, and heat the temperature in the heating chamber 3 to 1050 °C - 1150 °C; when the mold 5 is transferred into the heating chamber 3, the heating time at 1050 °C - 1150 °C is not less than 20 min

[0052] S4: Turn on the induction melting furnace 2 and start melting the silver ingots. After the induction melting furnace 2 reaches 1100°C - 1200°C, keep it warm for 2 min - 5 min.

[0053] S5: After step 4 is completed, rotate the turntable 4 to turn the mold 5 out of the heating chamber 3, tilt the induction melting furnace 2, pour the molten silver in the induction melting furnace 2 into the mold 5. After pouring, rotate the turntable 4 to turn the mold 5 into the heating chamber 3 for static settling for 4 min - 10 min. Rotate the turntable 4 again to turn the mold 5 out of the heating chamber 3 to cool and solidify the silver melt in the mold 5, obtaining a solidified silver ingot.

[0054] S6: Milling 2 mm - 5 mm from the upper surface of the solidified silver ingot, thus obtaining the silver material with inorganic non-metallic impurities treated.

[0055] During the solidification process, when the molten metal is poured into the mold, usually only the uppermost part is exposed to the air, while the surrounding and the bottom are surrounded by the mold. This surface exposed to the air is the solidification surface, also known as the solidification front or solidification interface. On this surface, the metal begins to cool and gradually solidifies into a solid state.

[0056] Please refer to the following specific embodiments:

[0057] The silver ingots purchased in this application are sourced from the national standard No. 1 standard silver ingots sold in the market.

[0058] For the method for determining inorganic non-metallic impurities in silver materials in the prior art, the specific operation is as follows: Load 100 g of silver material into a graphite mold and place it in an atmosphere heating furnace. First, evacuate to 0.1 MPa, then fill with argon to normal pressure, and repeat the evacuation and filling once. Set the heating temperature to 1010°C and keep it warm for 2 min. When the furnace temperature drops below 400°C, take out the sample. The total time for atmosphere heating and melting to remove impurities is 4 - 5 hours.

[0059] The tubular electric furnace model is GWL - 1200KAGA, and the manufacturer is Luoyang Juxing Kiln Furnace Co., Ltd. The impurities float on the upper surface of the metal solidification, forming an approximately circular area. Use a caliper to measure the diameter of the impurities on the upper surface of the sample solidification and calculate the area of the circle. Principle: The main reason for the impurities to float on the metal surface and form an approximately circular area is the action of surface tension, which causes the impurities to gather together to form a circular area.

[0060] Comparative Example 1

[0061] Using the method for determining inorganic non-metallic impurities in silver materials to determine the non-metallic impurities in the purchased national standard No. 1 standard silver ingot, the diameter of the circle formed by the inorganic non-metallic impurities in the national standard No. 1 standard silver ingot sample is measured to be 3 cm 2 .

[0062] Comparative Example 2 (Single Induction Melting)

[0063] S1: Open the vacuum chamber 1. After sandblasting the surface of the standard silver ingot, cut it into silver blocks. Put 100 g of silver blocks into the induction melting furnace 2, and place the existing technology mold on the mold platform: a mold heated externally to 350°C - 400°C;

[0064] S2: Close the vacuum chamber 1. First, evacuate to 0.1 MPa, and then fill it with argon to normal pressure;

[0065] S3: Turn on the induction melting furnace 2 and start melting the silver blocks. After the induction melting furnace 2 reaches 1100°C - 1200°C, keep it warm for 3 minutes;

[0066] S4: Rotate the induction melting furnace 2 to make it tilt, and pour the molten silver in the induction melting furnace 2 into the mold 5, so that the silver melt in the mold 5 cools and solidifies to obtain a solidified silver block;

[0067] S5: Milling 3 mm from the upper surface of the solidified silver block to obtain the silver material of Comparative Example 1.

[0068] Using the method for measuring inorganic non-metallic impurities in silver materials to measure the inorganic non-metallic impurities in the silver material of Comparative Example 1, the area of the circle formed by the inorganic non-metallic impurities in the silver material of Comparative Example 1 is 3 cm 2 . The circular area formed by the inorganic non-metallic impurities in the silver material of Comparative Example 1 is basically unchanged compared with the circular area formed by the inorganic non-metallic impurities in the national standard No. 1 standard silver ingot sample, indicating that the method of single melting cannot effectively remove inorganic non-metallic impurities.

[0069] Example 1:

[0070] A method for treating inorganic non-metallic impurities in silver materials, comprising the following steps:

[0071] S1: Open the vacuum chamber 1. After sandblasting the surface of the standard silver ingot, cut it into silver blocks. Put 100 g of silver blocks into the induction melting furnace 2, and place the mold 5 on the turntable 4;

[0072] S2: Close the vacuum chamber 1. First, evacuate to 0.1 MPa, and then fill it with argon to normal pressure;

[0073] S3: Rotate the turntable 4 to transfer the mold 5 into the heating chamber 3, and heat the temperature in the heating chamber 3 to 1080°C. The heating time of the mold 5 at 1080°C is 20 minutes;

[0074] S4: Turn on the induction melting furnace 2 and start melting the silver blocks. After the induction melting furnace 2 reaches 1150°C, keep it warm for 3 minutes;

[0075] S5: After step 4 is completed, rotate the turntable 4 to take out the mold 5 from the heating chamber 3, tilt the induction melting furnace 2, pour the molten silver in the induction melting furnace 2 into the mold 5. After pouring, rotate the turntable 4 to transfer the mold 5 into the heating chamber 3 for standing. The standing time is 5 min. Then rotate the turntable 4 again to take out the mold 5 from the heating chamber 3, so that the silver melt in the mold 5 cools and solidifies to obtain a solidified silver block.

[0076] S6: Mill 3 mm from the upper surface of the solidified silver block to obtain the silver material of Example 1.

[0077] Use the method for determining inorganic non-metallic impurities in silver materials to measure the non-metallic impurities in the silver material of Example 1. The area of the circle formed by the inorganic non-metallic impurities in the silver material sample of Example 1 is 0.13 cm 2 . Compared with the national standard No. 1 standard silver ingot, the area of the circle formed by the inorganic non-metallic impurities in the silver material sample of Example 1 is reduced by 95.7% year-on-year.

[0078] Example 2:

[0079] A method for treating inorganic non-metallic impurities in silver materials, comprising the following steps:

[0080] S1: Open the vacuum chamber 1. After sanding the surface of the standard silver ingot, cut it into silver blocks. Put 100 g of silver blocks into the induction melting furnace 2, and place the mold 5 on the turntable 4.

[0081] S2: Close the vacuum chamber 1, first evacuate to 0.1 MPa, and then fill with argon to normal pressure.

[0082] S3: Rotate the turntable 4 to transfer the mold 5 into the heating chamber 3, and heat the temperature in the heating chamber 3 to 1120 °C; the heating time of the mold 5 at 1120 °C is 20 min.

[0083] S4: Turn on the induction melting furnace 2 to start melting the silver blocks. After the induction melting furnace 2 reaches 1100 °C, keep it warm for 5 min.

[0084] S5: After step 4 is completed, rotate the turntable 4 to take out the mold 5 from the heating chamber 3, tilt the induction melting furnace 2, pour the molten silver in the induction melting furnace 2 into the mold 5. After pouring, rotate the turntable 4 to transfer the mold 5 into the heating chamber 3 for standing. The standing time is 10 min. Then rotate the turntable 4 again to take out the mold 5 from the heating chamber 3, so that the silver melt in the mold 5 cools and solidifies to obtain a solidified silver block.

[0085] S6: Mill 2 mm from the upper surface of the solidified silver block to obtain the silver material of Example 2.

[0086] The non-metallic impurities in the silver material of Example 2 were determined by the method for determining inorganic non-metallic impurities in silver materials. The area of the circle formed by the inorganic non-metallic impurities in the silver material sample of Example 2 was measured to be 0.16 cm 2 . Compared with the national standard No. 1 standard silver ingot, the area of the circle formed by the inorganic non-metallic impurities in the silver material sample of Example 2 decreased by 94.7% year-on-year.

[0087] Example 3:

[0088] A method for treating inorganic non-metallic impurities in silver materials, comprising the following steps:

[0089] S1: Open the vacuum chamber 1. After sanding the surface of the standard silver ingot, cut it into silver blocks. Put 100 g of silver blocks into the induction melting furnace 2, and place the mold 5 on the turntable 4;

[0090] S2: Close the vacuum chamber 1. First, evacuate to 0.1 MPa, and then fill it with argon to normal pressure;

[0091] S3: Rotate the turntable 4 to transfer the mold 5 into the heating chamber 3, and heat the temperature in the heating chamber 3 to 1050 °C; the heating time of the mold 5 at 1050 °C is 20 min;

[0092] S4: Turn on the induction melting furnace 2 and start melting the silver blocks. After the induction melting furnace 2 reaches 1200 °C, keep it warm for 4 min;

[0093] S5: After step 4 is completed, rotate the turntable 4 to transfer the mold 5 out of the heating chamber 3, rotate the induction melting furnace 2 to make it tilt, pour the molten silver in the induction melting furnace 2 into the mold 5. After pouring, rotate the turntable 4 to transfer the mold 5 into the heating chamber 3 and let it stand for 8 min. Then rotate the turntable 4 again to transfer the mold 5 out of the heating chamber 3 to cool and solidify the silver melt in the mold 5 to obtain a solidified silver block;

[0094] S6: Milling 2.5 mm from the upper surface of the solidified silver block to obtain the silver material of Example 3.

[0095] The non-metallic impurities in the silver material of Example 3 were determined by the method for determining inorganic non-metallic impurities in silver materials. The area of the circle formed by the inorganic non-metallic impurities in the silver material sample of Example 3 was measured to be 0.15 cm 2 . Compared with the national standard No. 1 standard silver ingot, the area of the circle formed by the inorganic non-metallic impurities in the silver material sample of Example 3 decreased by 95% year-on-year.

[0096] Summarize the impurity areas of the silver blocks in Comparative Example 1, Comparative Example 2 and Examples 1-3, as shown in Table 1.

[0097] Table 1 Circular areas formed by non-metallic impurities in silver blocks of Comparative Example 1, Comparative Example 2 and Examples 1-3

[0098]

[0099] As can be seen from Table 1, the national standard No. 1 standard silver ingot adopting the treatment method of inorganic non-metallic impurities in the silver material of the present application can meet the empirical requirements of impurities during the evaporation of silver particles, and the areas of the circles formed by the inorganic non-metallic impurities are all less than 0.5 cm 2 .

[0100] The above-described embodiments are only preferred embodiments of the present invention, which are merely used to explain the present invention and do not limit the scope of implementation of the present invention. For those skilled in the art of this technology, other implementation manners can of course be easily made by means of substitution or change according to the technical content disclosed in this specification. Therefore, all changes and improvements made on the principle of the present invention should be included within the scope of the patent application of the present invention.

Claims

1. A device for treating inorganic non-metallic impurities in a silver material, comprising a vacuum chamber (1), an induction melting furnace (2), and a mold (5), characterized in that: It also includes a heating chamber (3) and a turntable (4); The induction melting furnace (2), the heating chamber (3) and the turntable (4) are all arranged in the vacuum chamber (1); the heating chamber (3) and the turntable (4) are located on one side of the induction melting furnace (2); The heating chamber (3) is provided with an opening for the turntable (4) to pass through, and a portion of the turntable body is located in the heating chamber (3); The mold (5) is arranged on a rotating disk (4), and the heating chamber (3) is provided with two openings for the mold (5) to pass in and out; The induction melting furnace (2) is rotatably arranged in the vacuum chamber (1), and the feeding port of the mold (5) and the discharging port of the induction melting furnace (2) are arranged correspondingly.

2. The device for treating inorganic non-metallic impurities in a silver material according to claim 1, characterized in that: A power mechanism is provided at the bottom of the turntable (4), the power mechanism comprising a first motor (8) and a reducer (12), the motor (8) and the reducer (12) both being located outside the vacuum chamber (1), the output end of the reducer (12) passing through the vacuum chamber (1) and then being fixed to the bottom of the turntable (4), the motor (8) transmitting power to the turntable (4) via the reducer (12) and driving the turntable (4) to rotate.

3. The device for treating inorganic non-metallic impurities in a silver material according to claim 1, characterized in that: At least two vertical baffles (402) are provided on the rotating disk (4), and the baffles (402) match the second opening on the heating chamber (3).

4. The device for treating inorganic non-metallic impurities in a silver material according to claim 3, characterized in that: The gap between the baffle (402) and two side walls of the opening of the heating chamber (3) is less than 3 mm.

5. The device for treating inorganic non-metallic impurities in a silver material according to claim 3, characterized in that: The baffle (402) is made of alumina heat-insulating refractory bricks and has a thickness of not less than 3 cm.

6. The device for treating inorganic non-metallic impurities in a silver material according to claim 1, characterized in that: The mold (5) and the crucible of the induction melting furnace (2) are both made of graphite.

7. The device for treating inorganic non-metallic impurities in silver material according to claim 1, characterized in that: The processing device also includes a gas storage tank (11) and a vacuum pump (7).

8. A method for treating inorganic non-metallic impurities in silver material, characterized in that: The steps include: S1: Open the vacuum chamber (1), grind the surface of the standard silver ingot, cut it into silver blocks, put the silver blocks into the induction melting furnace (2), and place the mold (5) on the turntable (4); S2: Close the vacuum chamber (1), evacuate to 0.1 MPa, and then fill it with argon gas to normal pressure; S3: rotating the turntable (4) to transfer the mold (5) into the heating chamber (3), and heating the temperature in the heating chamber (3) to 1050° C.-1150° C.; S4: starting the induction melting furnace (2) to melt the silver block, and then maintaining the temperature of the induction melting furnace (2) after the temperature reaches 1100° C. to 1200° C. for 2 min to 5 min; S5: After step 4 is completed, the turntable (4) is rotated to turn the mold (5) out of the heating chamber (3), the induction melting furnace (2) is rotated to tilt it, and the molten silver in the induction melting furnace (2) is poured into the mold (5). After pouring, the turntable (4) is rotated to turn the mold (5) into the heating chamber (3) and let it stand for 4 minutes to 10 minutes. The turntable (4) is rotated again to turn the mold (5) out of the heating chamber (3), so that the molten silver in the mold (5) is cooled and solidified, thereby obtaining a solidified silver block; S6: Milling the upper surface of the solidified silver block by 2 mm to 5 mm to obtain the treated silver material with inorganic non-metallic impurities.

9. The method for treating inorganic non-metallic impurities in a silver material according to claim 8, characterized in that: In S3, the mold (5) is transferred into the heating chamber (3) and heated at 1050°C-1150°C for not less than 20 minutes.

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