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CN-117701924-B - Beryllium copper alloy leftover material recycling and smelting method

CN117701924BCN 117701924 BCN117701924 BCN 117701924BCN-117701924-B

Abstract

The invention provides a beryllium copper alloy leftover material recovery smelting method, which belongs to the technical field of alloy material recovery, and comprises the steps of carrying out heat cleaning on the beryllium copper alloy leftover material, and then soaking in a metal cleaning liquid; spreading the soaked beryllium copper alloy leftover materials on an iron plate for steam airing, wrapping the beryllium copper alloy leftover materials after steam airing, sequentially pressing and baking, carrying out low-power gradual high-power baking on a vacuum smelting furnace, loading the baked beryllium copper alloy leftover materials into the vacuum smelting furnace, carrying out primary vacuum smelting, sequentially refining, casting and solidifying to obtain a primary alloy ingot, loading the primary alloy ingot into the vacuum smelting furnace, carrying out secondary vacuum smelting, sequentially refining, casting, solidifying and ingot peeling to obtain a secondary alloy round ingot. The invention realizes high metal yield and high ingot casting quality, and reduces environmental pollution.

Inventors

  • ZHENG XUEQING
  • HAN MINGDA
  • CUI SHUHUI
  • ZHAO SHUCHANG
  • WANG YANTING

Assignees

  • 宁夏中色新材料有限公司

Dates

Publication Date
20260512
Application Date
20231201

Claims (8)

  1. 1. The beryllium copper alloy leftover material recycling and smelting method is characterized by comprising the following steps of: Step S1, after the beryllium copper alloy leftover materials are subjected to hot cleaning, soaking the beryllium copper alloy leftover materials in a metal cleaning solution for 0.5-1.5 h; In the step S1, the metal cleaning liquid includes phosphoric acid, sodium tripolyphosphate, sodium benzenesulfonate, anionic surfactant, sodium carbonate, nonionic surfactant, sodium silicate, and water; The phosphoric acid, sodium tripolyphosphate, sodium benzenesulfonate, anionic surfactant, sodium carbonate, nonionic surfactant, sodium silicate and water are 18-22 parts by weight, 0.8-1.2 parts by weight, 3-5 parts by weight, 2.5-3.5 parts by weight, 14-16 parts by weight, 0.8-1.2 parts by weight and 948-950 parts by weight; in the step S1, the anionic surfactant is polyacrylamide; The nonionic surfactant is alkylphenol polyoxyethylene; Step S2, spreading beryllium copper alloy leftover materials soaked in the metal cleaning liquid for 0.5-1.5 hours on an iron plate for steam airing; the thickness of the beryllium copper alloy leftover material paved on the iron plate is less than 100mm; Step S3, wrapping the beryllium copper alloy leftover materials after steam airing, and then sequentially pressing and baking; s4, baking the vacuum smelting furnace from low power to high power gradually; In the step S4, the process of baking from low power to high power is specifically: firstly, baking for 13-17 hours by using 22-28 kW, then baking for 6-12 hours by using 53-57 kW, and finally baking for 6-10 hours by using 103-116 kW; S5, loading the baked beryllium copper alloy leftover blocks into a baked vacuum smelting furnace, raising the power to 175-185 kW within 25-35 minutes, raising the temperature to 1120-1280 ℃ by using 175-185kW, carrying out primary vacuum smelting for 15-30 minutes under the vacuum degree of less than-0.08 MPa, and sequentially carrying out refining, casting and solidification to obtain primary alloy ingots; And S6, loading the primary alloy ingot into a vacuum smelting furnace, heating to 1270-1420 ℃ by adopting 190-200 kW of power, carrying out secondary vacuum smelting for 20-40 min under the vacuum degree of less than-0.08 MPa, and sequentially carrying out refining, casting, solidification and ingot peeling to obtain a secondary alloy round ingot.
  2. 2. The beryllium copper scrap recovery melting method of claim 1 wherein in step S1 the beryllium copper scrap includes turning dust, milling dust, saw dust, and scrap strip.
  3. 3. The beryllium copper alloy scrap recycling and smelting method according to claim 2, wherein in the step S1, the specific implementation process of the heat cleaning is as follows: And cleaning the beryllium copper alloy leftover materials by adopting hot water with the temperature of 90-100 ℃, and then soaking the beryllium copper alloy leftover materials in the hot water with the temperature of 90-100 ℃ for 0.5-1.5 h.
  4. 4. The beryllium copper alloy leftover material recycling and smelting method according to any one of claims 1-3, wherein in the step S2, the thickness of the beryllium copper alloy leftover material paved on an iron plate is 85-95 mm.
  5. 5. The beryllium copper alloy scrap recycling and smelting method according to claim 4, wherein in the step S2, a steam pipeline for passing steam at 90-110 ℃ is paved below the iron plate; in the steam airing process, the steam is turned once every 0.5-1.5 h, 7-9 times per day, and airing is carried out for at least 3 days.
  6. 6. The beryllium copper alloy scrap recycling and smelting method according to claim 5, wherein in the step S3, the baking temperature is 170-230 ℃ and the baking time is 5-7 h.
  7. 7. The beryllium copper alloy scrap recycling and smelting method according to claim 6, wherein in the step S5, the refining temperature is 1140-1280 ℃ and the time is 17-27 min, and the casting temperature is 1070-1230 ℃; in the step S6, the refining temperature is 1320-1430 ℃ and the time is 23-36 min, and the casting temperature is 1220-1360 ℃.
  8. 8. The beryllium copper alloy scrap recycling and smelting method according to claim 7, wherein in the casting process, rice straw ash is adopted to cover the whole liquid level after the transfer, and finally the molten beryllium copper alloy scrap is cast in a graphite mold.

Description

Beryllium copper alloy leftover material recycling and smelting method Technical Field The invention belongs to the technical field of alloy material recovery, and particularly relates to a beryllium copper alloy leftover material recovery smelting method. Background The beryllium copper alloy is a typical aging precipitation hardening alloy, has the characteristics of high strength, high elasticity, wear resistance, corrosion resistance, no magnetism, no spark and the like after solid solution and aging heat treatment, and is an elastic king for manufacturing elastic components in the field of materials. The method is widely applied to industries such as aerospace, automobiles, mobile phones, computers, electronic communication, high-speed bearings, wear-resistant gears, submarine cables, deep sea detectors and the like. Due to the special properties of materials, there are irreplacements in some fields of application. During the hot working and cold working production process of beryllium copper alloy cast ingots, strips and bars, a large amount of leftover materials with different shapes such as oil/emulsion plate strips, emulsion milling scraps, bar turning scraps and the like can be produced, so that the occupied space is large and the management is difficult. Especially, the bar scraps and emulsion milling scraps are light in weight, large in volume and contain a large amount of emulsion waste residues. And electrode stub bars, pouring materials, pressing excess materials and the like cause the increase of the difficulty of the recovery process due to abnormal shapes, different specifications, oxidation layers, greasy dirt, water and the like on the surfaces, the surface oxidation layers and the greasy dirt are not completely treated, the yield of directly smelted metal is low when the metal is reused, the serious problem of metal burning loss exists, the addition proportion is high, the defects of cast ingots such as air holes and the like can be generated, the cast ingots are poor in quality, and the efficient recycling cannot be realized. On the smelting of beryllium copper alloy, the conventional method is based on the conventional non-vacuum smelting, waste scraps are directly recycled by adopting the non-vacuum smelting, the internal and external environments of a workshop are polluted in the production process, the process is unstable, and the problems of large metal burning loss, more oxidation slag formation, low yield, poor consistency of alloy chemical components, large production energy consumption, high production cost and the like exist. The copper alloy leftover material recovery process is complex, and the procedures of cleaning, drying, packing, separating and screening and the like are required, so that the requirement is quite strict. If the materials cannot be strictly managed, the materials are mixed, so that the components of the finished cast ingot are unqualified, and if the water and oil are contained, the air holes in the cast ingot are formed, so that the quality of the cast ingot cannot be ensured. Because the scraps are loose, the density is low, the scraps are difficult to melt because of floating on the surface in the process of recycling and melting, the surface area is large, the oxidation is more, the oxygen content in the pores is more, the oxidation slagging is serious, the formed slag floats on a copper-liquid interface, the further melting is prevented, the metal yield of copper beryllium alloy scraps is low, and the ingot casting quality is poor. Disclosure of Invention The invention aims to provide a beryllium copper alloy leftover material recovery smelting method, which realizes high metal yield and ingot casting quality and reduces environmental pollution under the condition of ensuring the uniformity of components of a beryllium copper alloy ingot casting. In order to achieve the above purpose, the invention adopts the following technical scheme: The beryllium copper alloy leftover material recycling and smelting method comprises the following steps of: Step S1, after the beryllium copper alloy leftover materials are subjected to hot cleaning, soaking the beryllium copper alloy leftover materials in a metal cleaning solution for 0.5-1.5 h; In the step S1, the metal cleaning liquid includes phosphoric acid, sodium tripolyphosphate, sodium benzenesulfonate, anionic surfactant, sodium carbonate, nonionic surfactant, sodium silicate, and water; The phosphoric acid, sodium tripolyphosphate, sodium benzenesulfonate, anionic surfactant, sodium carbonate, nonionic surfactant, sodium silicate and water are 18-22 parts by weight, 0.8-1.2 parts by weight, 3-5 parts by weight, 2.5-3.5 parts by weight, 14-16 parts by weight, 0.8-1.2 parts by weight and 948-950 parts by weight; Step S2, spreading beryllium copper alloy leftover materials soaked in the metal cleaning liquid for 0.5-1.5 hours on an iron plate for steam airing; the thickness of the beryllium copper alloy lef