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 low direct yield of rare metals, large acid consumption and loss, etc.

Inactive Publication Date: 2014-07-30
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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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, melt it in an intermediate frequency melting crucible, and atomize it into alloy metal powder of 23 μm by gas atomization, mix the alloy metal powder with the particle size of 100 μm Silica powder (purity greater than 99%) is mixed uniformly at a volume ratio of 1:1, placed on a quartz sand core layer, and a metal powder bed with a thickness of 2cm is constructed, and then heated in a tube furnace at a heating rate of 2°C / min. The metal powder bed layer was heated up to 400°C, and at the same time, oxygen gas with a pressure of 1.5 atmospheres and a flow rate of 200ml / min was introduced from bottom to top. Nitrogen and chlorine gas with a pressure of 1.2 atmospheres are introduced from bottom to top, the flow rate of nitrogen gas is 200ml / min, and the flow rate of chlorine gas is 100m...

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 more than 15kg of nickel-based superalloy waste into 1.5cm, melt it in an intermediate frequency melting crucible, and atomize it into 10μm alloy metal powder by gas atomization, and mix the alloy metal powder with a particle size of 150μm Silicon oxide powder (purity greater than 99%) is mixed uniformly at a volume ratio of 1:1, placed on a quartz sand core layer, and a metal powder bed with a thickness of 6cm is constructed, and then the tube furnace is heated at a heating rate of 5°C / min. The metal powder bed in the furnace is heated to 500°C, and at the same time, oxygen gas with a pressure of 2 atmospheres and a flow rate of 2000ml / min is introduced from bottom to top, and the temperature is kept for 2 hours, then the temperature is lowered to 400°C, and the oxygen flow is stopped, and then Nitrogen and chlorine gas with a pressure of 2 ...

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 more than 12kg of nickel-based superalloy waste into 2cm, melt it in an intermediate frequency melting crucible, and atomize it into 50μm alloy metal powder by gas atomization, mix the alloy metal powder with the particle size of 110μm The silicon oxide powder is mixed evenly at a volume ratio of 1:1, placed on the quartz sand core layer, and a metal powder bed with a thickness of 10cm is constructed, and then the metal powder bed in the tube furnace is heated up at a heating rate of 2.5°C / min. to 450°C, while feeding compressed air with a pressure of 1.8 atmospheres and an air flow rate of 1500ml / min from bottom to top, keeping it warm for 1 hour, then cooling down to 350°C, and stopping the introduction of compressed air, and then from bottom to top Introduce nitrogen and chlorine gas at a pressure of 1.5 atmospheres, wherein the flow rate...

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

Claims

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Application Information

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Patent Type & Authority Patents(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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