Method for preparing Cr-W-C alloy by using K213 high-temperature alloy injection residues
By performing multi-step treatment on the residue injection material of the nickel-based high-temperature alloy K213, Cr-W-C alloy was prepared, which solved the problem of poor regeneration and utilization of precious metals, and achieved the preparation of high-purity alloys and the improvement of the quality of the master alloy products.
Patent Information
- Application Number
- CN202510498925.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2025-06-06
AI Technical Summary
The prior art is difficult to effectively utilize precious metals such as nickel, chromium, tungsten, etc. in cast high-temperature alloys, resulting in poor recycling and utilization of these metal resources.
By briquetting, arc smelting, water quenching, carbonylation synthesis and reduction and calcining, Cr-W-C alloy is prepared, and elements such as Cr and W in the alloy are regenerated and utilized.
The effective recycling and reuse of nickel, iron and other elements in K213 high-temperature alloy is achieved. The prepared Cr-W-C alloy has high purity and low oxygen and nitrogen content. It is suitable for vacuum induction smelting process and improves the quality of the master alloy product.
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Figure CN120099290A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of metal recycling and reuse, and in particular to a method for preparing a Cr-WC alloy by utilizing K213 high-temperature alloy residual slag. Background Art
[0002] In the treatment of high-temperature alloy return materials, they must first be classified by brand, and then they are treated according to their fixed processes according to different types of return materials. Finally, the treated return materials are added in proportion to produce the same brand of high-temperature alloy master alloys. The same brand of high-temperature alloy return materials can be divided into three categories according to the treatment process: direct treatment materials, indirect treatment materials and difficult-to-treat materials. Direct treatment materials are high-temperature alloy return materials that can be directly added in proportion after raw material pretreatment and vacuum induction melting process, including master alloy head and tail, precision casting excess, precision casting defective parts, high-temperature alloy failure parts, etc.; indirect treatment materials are materials with large shapes and non-metallic impurities that are difficult to separate on the surface of the materials. After non-vacuum medium frequency melting, slag purification and other purification smelting processes, they can be used as direct treatment materials, including master alloy excess diverter plates, large volutes, retired high-temperature alloy parts, etc.; difficult-to-treat materials are return materials that cannot be effectively treated by the above two methods, including master alloy excess slag-containing materials, turning, slag, grinding steel powder and other materials, and precision manufacturing excess slag-containing materials. Casting high-temperature alloys are complex in composition, often with more than dozens of elements, and have the characteristics of high strength, high hardness, high temperature resistance, corrosion resistance and wear resistance. Therefore, their waste has the following characteristics: a wide variety of components with high complexity; high volatility of component content; high hardness; structural density; and various shapes. At present, the difficult-to-treat materials of casting high-temperature alloys are basically handled in the form of stockpiling. Some companies also sell them in the form of pricing based on precious metals such as nickel and cobalt, and base metals such as chromium or metals with low content are not priced for use in the smelting of low-quality alloy steel, which makes the recycling effect of precious metals such as nickel, chromium, and tungsten in the high-temperature alloy injection slag poor. Summary of the invention
[0003] The present invention provides a method for preparing a Cr-WC alloy by using K213 high temperature alloy slag injection to solve the problems existing in the above background.
[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A method for preparing a Cr-WC alloy by using K213 high temperature alloy slag injection, comprising the following steps: Step 1: Compact the alloy slag in the target raw material nickel-based high-temperature alloy K213 into blocks.
[0005] Step 2: Place the metal compact obtained in step 1 into an electric arc furnace for smelting. After smelting, perform water quenching to obtain alloy particles.
[0006] Step 3: Carbylating the alloy particles obtained in step 2, and the obtained carbonyl nickel and carbonyl iron enter the subsequent decomposition process to prepare carbonyl nickel-iron powder, and the obtained carbonyl slag is hydraulically classified.
[0007] Step 4: The hydraulically classified heavy component obtained in step 3 is mixed with graphite powder, pressed into a mass, and then placed in a muffle furnace for reduction roasting to obtain a Cr-WC alloy, which is composed of the following elements in percentage by mass: W accounts for 21%-31%, C accounts for ≤2%, and Cr and impurities account for ≥67%-77%.
[0008] Furthermore, the target raw material nickel-based high-temperature alloy K213 in step 1 is a raw material that cannot be regenerated into the original grade alloy by vacuum induction melting, medium frequency melting and other methods.
[0009] Furthermore, in step 2, the water quenching liquid is a NiSO4 solution, the concentration of which is 20g / L-120g / L, and the flow rate of the NiSO4 water quenching liquid is 0.2m / s-8m / s.
[0010] Furthermore, in step 3, the pressure of carbonyl synthesis is controlled at 5MPa-9.5MPa, the temperature is controlled at ≤200°C-250°C, the decomposition temperature of carbonyl nickel is controlled at 220°C-300°C, and the hydraulic classification water flow rate is controlled at 1m / s-8m / s.
[0011] Furthermore, in step 4, the particle size of the graphite powder is ≤0.15 mm, the mass percentage of the graphite powder is ≤1%-5%, and the reduction roasting temperature is controlled to be 900°C-1300°C.
[0012] The present invention has the following beneficial effects: The present invention regenerates the K213 high-temperature alloy, a difficult-to-treat material that has been stored for a long time in the casting high-temperature alloy industry, into Cr and W raw materials for producing the original grade casting high-temperature alloy K213 through the preparation of the Cr-WC alloy. The alloy has high purity and low oxygen and nitrogen content, which is beneficial to the segregation and slag control in the vacuum induction melting process of the original grade casting high-temperature alloy K213, effectively improving the quality of the K213 master alloy product. At the same time, the nickel and iron in the K213 alloy slag are effectively recovered and used for the preparation of carbonyl nickel-iron powder. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a preparation flow chart of the Cr-WC alloy in the present invention. DETAILED DESCRIPTION
[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0015] The method for preparing Cr-WC alloy by using K213 high temperature alloy slag injection comprises the following steps: Example 1 Step 1: Compact the alloy slag in the target raw material nickel-based high-temperature alloy K213 into blocks.
[0016] Step 2: Place the metal block obtained in step 1 into an electric arc furnace for smelting. After smelting, quench with water to obtain alloy particles, NiSO 4 The concentration of the water quenching liquid is 20 g / L, and the flow rate of the water quenching liquid is 0.2 m / s.
[0017] Step 3, the alloy particles obtained in step 2 are subjected to carbonyl synthesis, and the obtained carbonyl nickel and carbonyl iron enter the subsequent decomposition process to prepare carbonyl nickel-iron powder, and the obtained carbonyl slag is hydraulically classified. The pressure of the carbonyl synthesis is controlled at 5MPa and the temperature is controlled at 210°C. The carbonyl nickel decomposition temperature is controlled at 220°C, and the hydraulic classification water flow rate is 1m / s.
[0018] Step 4: Mix the hydraulically classified heavy component obtained in step 3 with graphite powder, press into a mass, and place in a muffle furnace for reduction roasting to obtain a Cr-WC alloy. The hydraulically classified light component obtained in step 3 can be used for the preparation of building materials. The graphite powder has a particle size of 0.15 mm, a mass percentage of graphite powder of 4%, and the reduction roasting temperature is controlled at 900°C.
[0019] According to the test, the mass content of oxygen in the Cr-WC alloy prepared in this embodiment is 12 ppm, the mass content of nitrogen is 11 ppm, the mass content of C is 1.3%, the mass content of W is 23.8%, and the balance is Cr and unavoidable impurities. The alloy can be used for vacuum induction melting of nickel-based alloy K213.
[0020] Example 2 Step 1: Compact the alloy slag in the target raw material nickel-based high-temperature alloy K213 into blocks.
[0021] Step 2: Place the metal block obtained in step 1 into an electric arc furnace for smelting. After smelting, quench with water to obtain alloy particles, NiSO 4 The concentration of the water quenching liquid is 60 g / L, and the flow rate of the water quenching liquid is 3.5 m / s.
[0022] Step 3, subjecting the alloy particles obtained in step 2 to carbonyl synthesis, and the obtained carbonyl nickel and carbonyl iron enter the subsequent decomposition process to prepare carbonyl nickel-iron powder, and the obtained carbonyl slag is hydraulically classified. The pressure of the carbonyl synthesis is controlled at 8 MPa, the temperature is controlled at 230°C, the carbonyl nickel decomposition temperature is controlled at 250°C, and the hydraulic classification water flow rate is 7 m / s.
[0023] Step 4: Mix the hydraulically classified heavy component obtained in step 3 with graphite powder, press into a mass, and place in a muffle furnace for reduction roasting to obtain a Cr-WC alloy. The hydraulically classified light component obtained in step 3 can be used for the preparation of building materials. The graphite powder particle size is 0.15 mm, the mass percentage of graphite powder is 4%, and the reduction roasting temperature is controlled at 1000°C.
[0024] According to the test, the mass content of oxygen in the Cr-WC alloy prepared in this embodiment is 11 ppm, the mass content of nitrogen is 12 ppm, the mass content of C is 1.2%, the mass content of W is 23.3%, and the balance is Cr and unavoidable impurities. The alloy can be used for vacuum induction melting of nickel-based alloy K213.
[0025] Example 3 Step 1: Compact the alloy slag in the target raw material nickel-based high-temperature alloy K213 into blocks.
[0026] Step 2: Place the metal block obtained in step 1 into an electric arc furnace for smelting. After smelting, quench with water to obtain alloy particles, NiSO 4 The concentration of the water quenching liquid is 120 g / L, and the flow rate of the water quenching liquid is 8 m / s.
[0027] Step 3, the alloy particles obtained in step 2 are subjected to carbonyl synthesis, and the obtained carbonyl nickel and carbonyl iron enter the subsequent decomposition process to prepare carbonyl nickel-iron powder, and the obtained carbonyl slag is hydraulically classified. The pressure of the carbonyl synthesis is controlled at 9.5 MPa, the temperature is controlled at 230°C, the carbonyl nickel decomposition temperature is controlled at 300°C, and the hydraulic classification water flow rate is 8 m / s.
[0028] Step 4: Mix the hydraulically classified heavy component obtained in step 3 with graphite powder, press into a mass, and place in a muffle furnace for reduction roasting to obtain a Cr-W-Nb alloy. The hydraulically classified light component obtained in step 3 can be used for the preparation of building materials. The graphite powder has a particle size of 0.15 mm, a mass percentage of graphite powder of 4%, and a reduction roasting temperature of 1300°C.
[0029] After testing, the mass content of oxygen in the Cr-WC alloy prepared in this embodiment is 13 ppm, the mass content of nitrogen is 13 ppm, the mass content of C is 1.0%, the mass content of W is 23.7%, and the balance is Cr and unavoidable impurities. The alloy can be used for vacuum induction melting of nickel-based alloy K213.
Claims
1. A method for preparing Cr-WC alloy by using K213 high temperature alloy slag injection, characterized in that: The following steps are involved: Step 1, briquetting the alloy overfill slag in the target raw material nickel-based high-temperature alloy K213; Step 2, placing the metal briquette obtained in step 1 into an electric arc furnace for smelting, and after smelting, quenching with water to obtain alloy particles; Step 3, the alloy particles obtained in step 2 are subjected to carbonyl synthesis, the obtained carbonyl nickel and carbonyl iron enter the subsequent decomposition process to prepare carbonyl nickel iron powder, and the obtained carbonyl slag is subjected to hydraulic classification; Step 4: The hydraulically classified heavy component obtained in step 3 is mixed with graphite powder, pressed into a mass, and then placed in a muffle furnace for reduction roasting to obtain a Cr-WC alloy, which is composed of the following elements in percentage by mass: W accounts for 21%-31%, C accounts for ≤2%, and Cr and impurities account for ≥67%-77%.
2. The method for preparing Cr-WC alloy by using K213 high temperature alloy slag injection according to claim 1, characterized in that: The target raw material nickel-based high-temperature alloy K213 in step 1 is a raw material that cannot be regenerated into the original grade alloy by vacuum induction melting, medium frequency melting and other methods.
3. The method for preparing Cr-WC alloy by using K213 high temperature alloy slag injection according to claim 1 is characterized in that: In step 2, the water quenching liquid is a NiSO4 solution, the concentration of which is 20g / L-120g / L, and the flow rate of the NiSO4 water quenching liquid is 0.2m / s-8m / s.
4. The method for preparing Cr-WC alloy by using K213 high temperature alloy slag injection according to claim 1, characterized in that: In step 3, the pressure of carbonyl synthesis is controlled at 5MPa-9.5MPa, the temperature is controlled at ≤200°C-250°C, the decomposition temperature of nickel carbonyl is controlled at 220°C-300°C, and the hydraulic classification water flow rate is controlled at 1m / s-8m / s.
5. The method for preparing Cr-WC alloy by using K213 high temperature alloy slag injection according to claim 1, characterized in that: In step 4, the particle size of the graphite powder is ≤0.15 mm, the mass percentage of the graphite powder is ≤1%-5%, and the reduction roasting temperature is controlled to be 900° C.-1300° C.