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A method for recovering nickel and cobalt from superalloy scrap

A high-temperature alloy and waste technology, applied in the field of hydrometallurgy, can solve the problems of imperfect waste treatment means, separation effect not as good as wet process, high energy consumption, etc., achieve good industrial application prospects, good research and utilization value, simple and convenient operation Effect

Inactive Publication Date: 2016-01-13
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2010, more than 7,000 tons of high-temperature alloy waste were produced in China. Due to the lack of professional recycling network, recycling technology and waste recycling enterprises with corresponding management levels, most of the waste was piled up or downgraded for use, resulting in a large amount of strategic metal being wasted; only A small amount of returning to the furnace is used for the preparation of high-temperature alloys, but due to imperfect waste treatment methods, the increase in harmful substances such as inclusions often affects the performance and service life of high-temperature alloys
Pyrotechnical equipment requires high requirements, large investment, high energy consumption, low recovery rate of rare metals, and the separation effect is not as good as wet process

Method used

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  • A method for recovering nickel and cobalt from superalloy scrap

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Comparison scheme
Effect test

Embodiment 1

[0028] The chemical composition of the superalloy scrap to be treated in this embodiment is: Ni60%, Co15%, Cr5%, Al5%, Fe1%, W6%, Ta4%, Hf4%. combine figure 1 , the present embodiment reclaims the method for nickel and cobalt from superalloy scrap, comprises the following steps:

[0029] Step 1. Weigh the superalloy waste, and then measure H according to the solid-to-liquid ratio of 1:6 + Inorganic acid with a concentration of 3.6mol / L was used as a primary leaching agent, and then the superalloy waste was mixed evenly with the primary leaching agent, and stirred at a temperature of 50°C for 0.5h to perform a primary leaching treatment to obtain a primary leaching residue and a primary leaching solution; The inorganic acid is preferably sulfuric acid;

[0030] Step 2, processing a section of leach residue and a section of leachate described in step 1 respectively:

[0031] Among them, the treatment process of one stage of leaching slag is:

[0032] Step 211, measure H acco...

Embodiment 2

[0040] The chemical composition of the superalloy scrap to be treated in this embodiment is calculated by mass percentage: Ni40%, Co20%, Cr10%, Al10%, Fe2%, W8%, Ta5%, Hf5%. combine figure 1 , the present embodiment reclaims the method for nickel and cobalt from superalloy scrap, comprises the following steps:

[0041] Step 1. Weigh the superalloy waste, and then measure H according to the solid-to-liquid ratio of 1:7 + Inorganic acid with a concentration of 3.8mol / L was used as a primary leaching agent, and then the superalloy waste was mixed evenly with the primary leaching agent, and stirred for 1 hour at a temperature of 60°C to perform a primary leaching treatment to obtain a primary leaching residue and a primary leaching solution; The inorganic acid is preferably sulfuric acid;

[0042] Step 2, processing a section of leach residue and a section of leachate described in step 1 respectively:

[0043] Among them, the treatment process of one stage of leaching slag is:

...

Embodiment 3

[0052] The chemical composition of the superalloy scrap to be treated in this embodiment is: Ni60%, Co16%, Cr8%, Al8%, Fe0.5%, W3%, Ta2%, Hf2%. combine figure 1 , the present embodiment reclaims the method for nickel and cobalt from superalloy scrap, comprises the following steps:

[0053] Step 1. Weigh the superalloy waste, and then measure H according to the solid-to-liquid ratio of 1:8 + Inorganic acid with a concentration of 4mol / L was used as a first-stage leaching agent, and then the superalloy waste was mixed evenly with the first-stage leaching agent, and stirred for 1.5 hours at a temperature of 70°C to perform a first-stage leaching treatment to obtain a first-stage leaching residue and a first-stage leaching solution; The inorganic acid is preferably sulfuric acid;

[0054] Step 2, processing a section of leach residue and a section of leachate described in step 1 respectively:

[0055] Among them, the treatment process of one stage of leaching slag is:

[0056]...

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Abstract

The invention provides a method for recycling nickel and cobalt from high temperature alloyed scrap. The method comprises following steps of firstly, carrying out one-stage leaching treatment on the high temperature alloyed scrap, so as to obtain one-stage leaching dregs and one-stage leaching liquor; secondly, respectively treating the one-stage leaching dregs and the one-stage leaching liquor, wherein the treating process of one-stage leaching dregs comprises steps of 211, carrying out two-stage leaching treatment so as to obtain two-stage leaching liquor and two-stage leaching dregs; 212, regulating acid value of two-stage leaching liquor, and reusing the two-stage leaching liquor as one-stage leaching agent; the treating process of one-stage leaching liquor comprises steps of 221, preliminarily precipitating the one-stage leaching liquor so as to remove impurities; 222, regulating pH value of the solution with sodium hydroxide, then carrying out deep precipitation so as to remove impurities; 223, separating nickel and cobalt out through extraction. Major metal elements like Ni and Co are effectively separated out from impurity elements like Cr, Al, Fe and the like by a wet method, the method is simple, has high recovery rate, and has broad application prospect in industry.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for recovering nickel and cobalt from superalloy waste. Background technique [0002] Waste superalloys contain a large amount of expensive main metal elements, which mainly come from: (1) Risers, shavings, turning chips, etc. generated during the preparation of superalloys; (2) Casting and processing of superalloy components and parts Scrap produced by forging; (3) Superalloy components and parts that have reached the end of their service life. In 2010, more than 7,000 tons of high-temperature alloy scraps were produced in China. Due to the lack of professional recycling networks, recycling technologies, and waste recycling companies with corresponding management levels, most of the scraps were piled up or downgraded for use, resulting in a large amount of strategic metals being wasted; only A small amount of reheating is used for the preparation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B23/00
CPCY02P10/20
Inventor 郭瑞王治钧王靖坤张卜升吴永谦马光李进
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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