Comprehensive recycling method for metals in superalloy scrap

A technology of superalloy and nickel-based superalloy, which is applied in the field of nickel-based superalloy and can solve the problems of large acid consumption, insignificant economic benefits, and low direct yield of rare metals.

Inactive Publication Date: 2013-06-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The recycling of nickel-based superalloy waste mainly includes pyrometallurgy and hydrometallurgy. However, due to the complex characteristics of the process and multiple considerations such as economic evaluation and environmental evaluation, there is no economically feasible recycling process to practice.
At present, considering the characteristics of nickel-based superalloys, such as complex and changeable chemical composition, the mainstream process adopts wet process for comprehensive recycling. The process generally includes leaching, chemical pre-removal, extraction and removal, nickel-cobalt separation and other processes. However, this process is long, with high energy consumption, large acid consumption, high cost of environmental protection treatment, and low direct recovery rate of rare metals, which are easy to be lost in the process, and the economic benefits are not obvious

Method used

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  • Comprehensive recycling method for metals in superalloy scrap
  • Comprehensive recycling method for metals in superalloy scrap
  • Comprehensive recycling method for metals in superalloy scrap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A certain type of nickel-based superalloy is used as the raw material, and the composition is as follows:

[0022]

[0023] Cut 10kg of the above nickel-based superalloy waste into 1cm pieces, then melt them in an intermediate frequency melting crucible, and atomize them into 23μm alloy metal powder by gas atomization. Silica powder (purity greater than 99%) was mixed uniformly at a volume ratio of 1:1, placed on the quartz sand core layer to build a metal powder bed with a thickness of 2cm, and then heated at a rate of 2°C / min. The metal powder bed was heated to 400°C, and at the same time, oxygen with a pressure of 1.5 atmospheres and a flow rate of 200ml / min was introduced from bottom to top, kept for 3 hours, and then cooled to 300°C, and the oxygen was stopped. Introduce nitrogen and chlorine gas with a pressure of 1.2 atmospheres from bottom to top, wherein the flow rate of nitrogen gas is 200ml / min, and the flow rate of chlorine gas is 100ml / min (the flow rati...

Embodiment 2

[0025] A certain type of nickel-based superalloy is used as the raw material, and the composition is as follows:

[0026]

[0027]Cut nickel-based superalloy scraps of more than 15kg into 1.5cm pieces, then melt them in an intermediate frequency melting crucible, and atomize them into 10μm alloy metal powder by gas atomization. The silicon oxide powder (purity greater than 99%) was mixed uniformly in a volume ratio of 1:1, placed on the quartz sand core layer to build a metal powder bed with a thickness of 6cm, and then the tube furnace was heated at a heating rate of 5°C / min. The metal powder bed in the heat sink is heated to 500°C, and at the same time, oxygen with a pressure of 2 atmospheres and a flow rate of 2000ml / min is introduced from bottom to top, kept for 2 hours, and then cooled to 400°C, and the oxygen is stopped, and then Introduce nitrogen and chlorine gas with a pressure of 2 atmospheres from bottom to top, wherein the flow rate of nitrogen gas is 2000ml / min...

Embodiment 3

[0029] A certain type of nickel-based superalloy is used as the raw material, and the composition is as follows:

[0030]

[0031] Cut nickel-based superalloy scraps of more than 12kg into 2cm pieces, then melt them in an intermediate frequency melting crucible, and atomize them into 50μm alloy metal powder by gas atomization. The silicon oxide powder was mixed uniformly in a volume ratio of 1:1, placed on the quartz sand core layer to build a metal powder bed with a thickness of 10 cm, and then the metal powder bed in the tube furnace was heated at a heating rate of 2.5°C / min At the same time, the compressed air with a pressure of 1.8 atmospheres and a flow rate of 1500ml / min was introduced from the bottom to 450°C, kept for 1 hour, then cooled to 350°C, and the compressed air was stopped, and then from the bottom to the top Introduce nitrogen gas and chlorine gas with a pressure of 1.5 atmospheres, wherein the flow rate of nitrogen gas is 1500ml / min, and the flow rate of ...

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Abstract

The invention provides a comprehensive recycling method for metals in superalloy scrap. The method comprises the following steps of: melting and atomizing nickel-based superalloy scrap into metal powder in certain particle size distribution by adopting a melting and atomizing process, constructing a metal powder bed layer by placing the metal powder in a fixed fluidized bed, placing the fixed fluidized bed in a tubular furnace, controlling the tubular furnace to be at a certain temperature, and enabling reactant gas with a certain pressure to pass through the metal powder bed layer from bottom to top, so that the reactant gas and nickel-based superalloy powder react at a certain reaction temperature to generate metallic oxides and metal chlorides; and separating different metals by utilizing that saturated vapor pressures of different metallic chlorides are different, then respectively treating the metals in a known manner, and recycling rare and precious metals, especially the metals such as rhenium, molybdenum and ruthenium. By adopting the comprehensive recycling method provided by the invention, the aim of comprehensively recycling valuable metals can be achieved, and the recycling efficiency of rare metals can be greatly improved; and the process is concise, the cost is low, and no pollution is produced.

Description

technical field [0001] The invention relates to a method for comprehensive recovery of nickel-based superalloys, especially nickel-based superalloy wastes containing rare and precious metals rhenium, ruthenium, tungsten, molybdenum, tantalum and the like. Background technique [0002] Nickel-based superalloys refer to austenitic alloys based on nickel (containing more than 50% nickel). In the range of 650 ~ 1100 ℃, it has high strength, good oxidation resistance and corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties. [0003] Nickel-based alloys contain more than ten alloying elements, among which Cr mainly plays the role of anti-oxidation and anti-corrosion, and other elements mainly play the role of strengthening. According to their strengthening mode, they can be divided into: solid solution strengthening elements such as tungsten, molybdenum, cobalt, chromium and vanadium; precipitation strengthening elements such as al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B1/08C22B3/04C22B34/24C22B34/32C22B34/36C22B11/00C22B15/00C22B23/00
CPCY02P10/20
Inventor 王玉天周亦胄张维钧金涛胡劲苏林瞿东
Owner KUNMING UNIV OF SCI & TECH
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