Method for recovering silver or other metals from silver-containing wastes

A waste and metal technology, applied in the field of metal resource recycling and regeneration, can solve serious problems, high energy consumption, environmental pollution and other problems, and achieve the effect of low recycling, low pollution and low cost

Active Publication Date: 2013-11-20
GUANGDONG BRUNP RECYCLING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the recycling of silver-containing waste generally adopts the fire recovery method. For example, the patent (CN1940099A) discloses a treatment method for waste and / or slime containing copper and precious metals. This method is mature and has high processing efficiency, but the method consumes a lot of energy. , serious environmental pollution

Method used

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  • Method for recovering silver or other metals from silver-containing wastes

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Effect test

Embodiment 1

[0039] The first step: take 20Kg of silver-containing waste materials and pulverize them, and sieve them with a 60-mesh standard sieve to obtain silver-containing alloy powders. After testing, the alloy powders contain 54.4% silver, 23.1% copper, 11.7% tin, and 10.8% nickel.

[0040] Step 2: Add 10Kg of silver-containing alloy powder into a 100-liter tetrafluoroethylene-lined reactor, add 40 liters of water, set the reaction temperature to 60°C, and stir at 110 rpm, then continuously add 1:1 nitric acid, carry out nitric acid leaching, the reaction time is controlled at 2 hours, the end point pH is controlled at 2, the leachate is filtered, and the leachate is fixed to 50L. After testing, the leachate contains 107.71g / L of silver and 45.64g / L of copper. Tin 23.07g / L, nickel 21.23g / L.

[0041] Step 3: Add the leaching solution to a 100-liter tetrafluoroethylene-lined reactor, set the reaction temperature to 60°C, and the stirring speed to 100 rpm. The amount of hydrochloric aci...

Embodiment 2

[0046] The first step: get 20Kg of silver-containing waste materials and pulverize them, and then sieve them with a 70-mesh standard sieve to obtain silver-containing alloy powders. After testing, the alloy powders contain 50.6% silver, 23.5% copper, 11.6% tin, and 11.8% nickel. and other substances.

[0047] Step 2: Add 10Kg of silver-containing alloy powder into a 100-liter tetrafluoroethylene-lined reactor, add 40 liters of water, set the reaction temperature to 80°C, and stir at 110 rpm, then continuously add 2.5:1 nitric acid, carry out nitric acid leaching, the reaction time is controlled at 1.5 hours, the terminal pH is controlled at 1.5, the leachate is filtered, and the leachate is constant to 50L.

[0048] Step 3: Add the leaching solution into a 100-liter tetrafluoroethylene-lined reactor, set the reaction temperature to 80°C, stir at 100 rpm, add 1.2 times the theoretical amount of hydrochloric acid, and the reaction time is 3 hours, then filter and wash to obtain...

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Abstract

The invention discloses a method for recovering silver or other metals from silver-containing wastes. The method comprises a physical-process treatment procedure, a nitric acid dissolution procedure, a silver separation and recovery procedure, a tin separation and recovery procedure, a copper separation procedure, and a nickel recovery procedure. By entirely adopting a wet-process recovery technique, all metals can be recovered while the high energy consumption and high pollution defects of the traditional recovery technique can be avoided, and the low-cost and high-efficiency recovery can be realized.

Description

technical field [0001] The invention relates to the field of recovery and regeneration of metal resources, in particular to a method for recovering silver and other metals from silver-containing waste materials. Background technique [0002] Silver has good electrical and thermal conductivity, and is widely used in fields such as photography, electrical electronics, electroplating, and medical industries. Adding other alloying elements to silver can improve the performance of silver. For example, adding copper can increase the hardness of silver, lower the melting point, improve castability, and further expand the application field of copper. [0003] With the increase in the amount of silver and silver alloys, the annual production of silver-containing waste is also increasing. From the perspective of resource reuse and silver regeneration value, recycling silver and other metals from silver-containing waste has significant economic and social benefits. [0004] At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00C22B23/00C22B25/06C22B3/44
CPCY02P10/20
Inventor 韦立剑李长东周汉章唐红辉刘更好
Owner GUANGDONG BRUNP RECYCLING TECH
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