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A method for recovering re from re-containing superalloy waste

A technology of superalloy and scrap, applied in the field of recycling Re, can solve the problems of equipment damage and difficult to use effectively, and achieve the effect of short time required, good recovery effect and short required cycle.

Active Publication Date: 2018-08-10
江苏杰之砂新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In addition, other methods that use hydrometallurgy to recover rare and precious metal elements in superalloys include high-pressure acid leaching, high-temperature alkali boiling, etc., but these methods will cause great damage to equipment due to strong corrosion under high temperature and high pressure. Difficult to apply effectively in industry

Method used

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  • A method for recovering re from re-containing superalloy waste

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Effect test

Embodiment 1

[0028] Step 1: Dissolve LiCl in a mixed solution of methanol and water (the volume ratio of methanol to water is 9:1), and use the mixed solution as the electrolyte to perform direct current electrolysis on the superalloy waste. During the electrolysis process, the superalloy waste is used as the anode , graphite is the cathode; Step 2: Filter and separate the obtained solution system to obtain filtrate a and filter residue b; Step 3: Use ammonia water with pH=11 to leach the filter residue b, heat and stir at the same time, and filter after half an hour , obtain the leach solution of filter residue b, repeat the leaching process for three times like this, the leaching rate of rhenium in the filter residue after three leachings is 81.84%; Step 4: mix the leach solution of filter residue b with filtrate a, then heat and distill and concentrate to improve the Re, Concentration of W and Mo; Step 5: Add excess calcium oxide powder to the concentrated solution, stir and heat to 100°...

Embodiment 2

[0030] Step 1: Dissolve LiCl in a mixed solution of methanol and water (the volume ratio of methanol to water is 9:1), and use the mixed solution as the electrolyte to perform direct current electrolysis on the superalloy waste. During the electrolysis process, the superalloy waste is used as the anode , graphite is the cathode; step 2: filter and separate the obtained solution system to obtain filtrate a and filter residue b; step 3: use KOH solution with pH=10.8 to leach filter residue b, heat and stir at the same time, and carry out after half an hour Filtrate to obtain the leachate of filter residue b, repeat the leaching process three times, and the leaching rate of rhenium in the filter residue after three leachings is 61.99%; Step 4: Mix the leachate of filter residue b with filtrate a, then heat and distill and concentrate to increase the Re in the mixture. , W, and Mo concentrations; Step 5: Add excess calcium oxide powder to the concentrated solution, stir and react a...

Embodiment 3

[0032]Step 1: Dissolve LiCl in a mixed solution of methanol and water (the volume ratio of methanol to water is 9:1), and use the mixed solution as the electrolyte to perform direct current electrolysis on the superalloy waste. During the electrolysis process, the superalloy waste is used as the anode , graphite is the cathode; Step 2: Filter and separate the obtained solution system to obtain filtrate a and filter residue b; Step 3: Use KOH solution with pH=11.2, methanol and water volume ratio of 9:1 to filter residue b. , heated and stirred at the same time, and filtered after half an hour to obtain the leaching solution of filter residue b, so repeated leaching treatment three times, the leaching rate of rhenium in filter residue b after three leachings was 74.53%; Step 4: Mix the leaching solution of filter residue b with filtrate a , and then heated and distilled to concentrate to increase the concentration of Re, W, and Mo in the mixed solution; Step 5: Add excess calciu...

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Abstract

The invention relates to a method for recovering Re from Re-containing high-temperature alloy waste. The method includes the following steps of firstly, carrying out direct-current electrolysis on the high-temperature alloy waste in an organic electrolyte system; secondly, carrying out solid-liquid separation to obtain filtrate a and filter residues b; thirdly, leaching and filtering the filter residues b many times by using an alkaline solution, and extracting the Re element in the filter residues b; fourthly, mixing a leaching solution of the filter residues b with the filtrate a, and then conducting distilling and concentrating; fifthly, adding calcium oxide into a concentrated solution to enable the elements of Mo and W to precipitate, and conducting filtering to obtain a solution only containing Re. The method for recovering the Re from the Re-containing high-temperature alloy waste has the advantages that the steps are simple, implementation is convenient, the investment cost is low, and the required time is short.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for recovering Re from Re-containing superalloy waste. Background technique [0002] Superalloys are a particularly important metal material in the aerospace field. The annual output of superalloys in my country is about 10,000 tons, and the waste generated in the casting process is often as high as 70% of the total materials. Superalloys contain rare and precious metal elements such as Re, Ta, W, Mo, Co, Ni, etc., which have extremely high recycling value. In particular, as an important strategic rare metal, Re is currently priced at about 30,000 yuan / kg, and its reserves in the world are less than 10,000 tons, while my country's reserved reserves are only more than 200 tons. Superalloy manufacturing is the field that consumes the most Re. For example, the second and third generation single crystal superalloys contain 3 wt.% and 6 wt.% Re, respecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/22
CPCC25C1/22Y02P10/20
Inventor 邓丽周亦胄侯桂臣田爱平孙毓泽
Owner 江苏杰之砂新材料有限公司
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