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A kind of recovery method of ag in bi-system superconducting wire tape

A recovery method, superconducting wire technology, applied in the field of silver recovery, to achieve the effect of simple experimental operation process, improved recovery rate, and easy separation

Active Publication Date: 2019-07-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current silver recovery technologies recorded in the literature mainly include fixer, slag, metal alloys, etc., and the Bi-based superconducting materials that use silver or silver alloys as sheath materials contain about 30% of high-temperature superconducting oxide powder recovery technology There are few reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The method that present embodiment reclaims Ag comprises the following steps:

[0034] Step 1. Shorten 500 grams of Bi-2223 single-core superconducting tape with sterling silver sheath;

[0035] Step 2. First mix the concentrated ammonia water with a mass concentration of 25% and deionized water at a volume ratio of 1:10, and then use it to soak the Bi-2223 single-core superconducting tape until the coating on the surface is dissolved, and then use it to remove Wash with deionized water for 4 times, and finally use metal detergent to soak for 30 minutes to remove the oil on the surface of the Bi-2223 single-core superconducting tape. After the oil is removed, use deionized water to wash the Bi-2223 single-core superconducting tape after removing the oil. Finally, use alcohol to dehydrate and dry;

[0036] Step 3, the sample is placed in the vacuum furnace, and the vacuum degree reaches 10 -3 After Pa, heat up to 400°C / 4h for heat treatment;

[0037] Step 4. Add the B...

Embodiment 2

[0043] The method that present embodiment reclaims Ag comprises the following steps:

[0044] Step 1, shorten 500 grams of Bi-2223 multi-core superconducting wire with a silver-magnesium alloy sheath;

[0045] Step 2. First mix the concentrated ammonia water with a mass concentration of 25% and deionized water at a volume ratio of 1:10, and then use it to soak the Bi-2223 multi-core superconducting wire until the coating on the surface is dissolved, and then use deionized Wash with water 4 times, and finally use metal detergent to soak for 30 minutes to remove the oil on the surface of the Bi-2223 multi-core superconducting wire. After the oil is removed, use deionized water to wash the Bi-2223 multi-core superconducting wire after removing the oil. dehydrated and dried;

[0046] Step 3, place the Bi-2223 multi-core superconducting wire after drying in step 2 in a vacuum furnace, at a vacuum degree of 10 -3 Pa, heat treatment at 500°C for 3 hours;

[0047] Step 4. Add the B...

Embodiment 3

[0053] The method that present embodiment reclaims Ag comprises the following steps:

[0054] Step 1. Shorten 500 grams of Bi-2212 superconducting multi-core strip with silver-gold sheath;

[0055] Step 2. First mix the concentrated ammonia water with a mass concentration of 25% and deionized water at a volume ratio of 1:10, and then use it to soak the Bi-2212 superconducting multi-core strip until the coating on the surface is dissolved, and then use it to remove After washing 4 times with deionized water, soak in metal detergent for 30 minutes to remove the oil stain on the surface of the Bi-2212 superconducting multi-core strip. After the oil stain is removed, use deionized water to wash and remove the oil. Dehydrated with alcohol and dried;

[0056] Step 3, place the Bi-2212 superconducting multi-core strip after drying in step 2 in a vacuum furnace, and place it in a vacuum furnace of 10 -3 Pa, heat treatment at 600°C for 2 hours;

[0057] Step 4. Add the Bi-2212 super...

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PUM

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Abstract

The invention discloses a recovery method of Ag from a Bi serial superconducting wire strip. The method comprises the following steps: first, removing greasy dirt and coatings of the silver- or silveralloy-containing Bi serial superconducting wire strip and then carrying out thermal treatment; then, dissolving the Bi serial superconducting wire strip in concentrated nitric acid, carrying out evaporation to decompose nitrate, adding water integrally to stir and age, and carrying out filtration to obtain a solution which contains undecomposed silver nitrate, strontium nitrate calcium nitrate and basic salt of small part of bismuth, dropwise adding concentrated hydrochloric acid into the solution to generate a silver chloride precipitate, keeping the precipitate in dark place and aging the same, filtering the precipitate, transferring the precipitate to a container, adding strong ammonia water to cover the precipitate, heating the precipitate to boil, slowly adding hydrazine hydrate while stirring till no precipitate is generated; and carrying out filtering and drying to obtain sponge silver powder, the mass purity of which is greater than 99.95% and the recovery rate of which is notless than 99%. The method disclosed by the invention is suitable for recovering silver from single-core and multi-core Bi serial silver-containing sheathes, and batched sponge silver powder which ishigh in purity and uniform and fine in grain size can be obtained.

Description

technical field [0001] The invention belongs to the technical field of silver recovery, and in particular relates to a method for recovering Ag from Bi-based superconducting wire strips. Background technique [0002] Superconducting materials are the basis of the application of superconducting technology, with NbTi, Nb 3 Low-temperature superconducting materials represented by Sn and MgB 2 Medium-temperature superconducting materials represented by BSCCO (Bi series) and high-temperature superconducting materials represented by YBCO (Y series) have entered or semi-industrialized mode in recent years, and are widely used in electric power, communication, national defense, medical treatment, etc. fields, with higher value-added application prospects. The mature application of these technologies has gone through a long research and development process in the early stage, and a lot of manpower, material resources and financial resources have been invested. The Bi-based oxide s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/007C22B11/046Y02P10/20
Inventor 熊晓梅李成山刘国庆郑会玲郝清滨王庆阳冯建情纪平
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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