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Method of selective electrolytic leaching recycling gold and copper from waste memory strips

A memory stick, selective technology, applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of inability to deal with waste memory sticks, lead and tin are not recycled, can not be recycled, and achieve good economic benefits The effects of social benefits, consumption saving, and short leaching cycle time

Active Publication Date: 2019-05-24
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of the present invention, it is found that using this type of technology consumes a lot of energy for crushing, and the cleaning and recovery after crushing is not thorough, resulting in a copper recovery rate of about 90%. Second, this method cannot handle waste memory sticks
At the same time, some small domestic enterprises are still using outdated methods such as open-type simple blast furnace direct smelting and full wet acid leaching recovery, which not only have a low recovery rate but also cause serious secondary pollution, all of which are environmentally unfriendly methods
However, the existing industrialized technology in foreign countries is fire method or fire method-wet method combined technology can effectively recover copper and precious metals, but lead, tin, etc. have not been recovered, and all enter the slag in the form of silicate, which cannot be recycled.

Method used

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  • Method of selective electrolytic leaching recycling gold and copper from waste memory strips
  • Method of selective electrolytic leaching recycling gold and copper from waste memory strips
  • Method of selective electrolytic leaching recycling gold and copper from waste memory strips

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 Utilizes the selective recovery of sodium sulfite and sodium chloride

[0029] (1) Take the memory stick and put it into the RETSCH SM300 coarse crusher made in Germany for crushing, and crush it to a particle size of 3~5mm, shake it well, take three sets of parallel samples for digestion, and then get Table 1 through ICP detection.

[0030] Table 1 Element content of waste gold fingers (ω, Au, Cu unit g / t)

[0031]

[0032] (2) Copper separation: Take 5g of the broken golden finger, add 50ml of 5mol / L hydrochloric acid, configure a reaction system with a liquid-solid volume-to-mass ratio of 10:1mL / g, stir at 700 rpm, and at a temperature of 25°C, add Sodium sulfite 1.4g, using a φ1cm carbon rod as the cathode and anode, the pole distance is 3cm, the contact length with the reaction system is 2.5cm, the DC voltage is 3V, and the constant temperature leaching time is 3h. After testing, about 1.48g of copper was leached, the leaching rate of copper was 98...

Embodiment 2

[0035] Embodiment 2 Utilizes the selective recovery of ferrous sulfate and potassium iodide

[0036] (1) Take samples, put them into RETSCH SM300 coarse crusher made in Germany for crushing, and crush until the particle size is 3~5mm, shake well, take three sets of parallel samples for digestion, and get Table 2 through ICP detection.

[0037] Table 2 Element content of waste gold fingers (ω, Au, Cu unit g / t)

[0038]

[0039] (2) Copper separation: take 130 grams of broken golden fingers, add 1300 ml of 7mol / L hydrobromic acid, configure a reaction system with a liquid-solid volume mass ratio of 10:1mL / g, set the stirring speed at 700rpm, and the temperature at 25°C , add 92.64 grams of ferrous sulfate, use a graphite plate with a thickness of 0.5cm as the cathode and anode, the pole distance is 6cm, the contact depth with the reaction system is 3.5cm, the voltage is 5V, and the constant temperature leaching time is 3h. Tested. About 38.65g of copper was leached, the lea...

Embodiment 3

[0042] Embodiment 3 Selective recovery using sodium sulfite and sodium chloride plus AC / DC superimposed power supply

[0043] (1) Take a sample, put it into a RETSCH SM300 coarse crusher made in Germany for crushing, and crush it to a particle size of 3-5 mm, shake it well, take three sets of parallel samples for digestion, and obtain Table 3 through ICP detection.

[0044] Table 3 Element content of waste gold fingers (ω, Au, Cu unit g / t)

[0045]

[0046] (2) Copper separation: Take 400 grams of broken golden fingers, add 4000 ml of 6mol / L hydrochloric acid, configure a reaction system with a liquid-solid volume mass ratio of 10:1mL / g, set the stirring speed at 700rpm, and the temperature at 25°C, add 64 grams of sodium sulfite, using a graphite plate with a thickness of 0.8cm as the cathode and anode, the distance between the poles is 10cm, the contact depth with the reaction system is 3.5cm, an external AC and DC superimposed power supply, the AC frequency is 800Hz, the a...

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Abstract

The invention belongs to the technical field of electrolytic recycling of metallic copper and gold, and particularly relates to a method of selective electrolytic leaching recycling gold and copper from waste memory strips. The method comprises the following specific steps that (1) a broken abandoned golden finger is put into an electrolytic bath containing an electrolytic solution I and an annexing agent I for electrolysis; (2) after reaction is finished, the broken abandoned golden finger is taken out and is replaced with a cathode plate, crude copper is recycled, and filtering and washing are carried out; (3) an electrolytic solution II and an annexing agent II are supplied in the electrolytic bath for re-electrolysis; (4) crude gold powder on a cathode is recycled after reaction is finished; and (5) a leaching solution is recycled and subjected to concentration and enrichment, and re-electrolysis and recycling are carried out. According to the method of selective electrolytic leaching recycling gold and copper from the waste memory strips, the recycling cost is low, the purpose of selective resource recycling the gold and copper is realized by adding different annexing agents in a same electrolytic solution system, and the recycling rates of the gold and the copper both can reach more than 98.5%.

Description

technical field [0001] The invention relates to a method for selectively electrolytically leaching and recovering gold and copper from waste memory bars, and belongs to the technical field of recovering metal gold and copper. Background technique [0002] At present, in domestic waste memory sticks, the gold content is 100~120g / t, and the copper content is about 300kg / t, which is much higher than that of gold mines and copper mines. And with the rapid development of the domestic information industry, the speed of replacement is changing with each passing day. Recycling copper and gold from discarded gold fingers can not only regenerate metals, but also reduce environmental pollution and economic losses to enterprises caused by direct disposal. [0003] The memory stick is also called "connecting finger" because its surface is gold-plated and the conductive contacts are arranged like fingers. The memory stick is actually covered with a layer of gold on the copper clad lamina...

Claims

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Application Information

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IPC IPC(8): C25C1/12C25C1/20C22B7/00C22B13/00C22B25/06
CPCY02P10/20
Inventor 王临才仲鸣慎李佳璇王晨风王景伟
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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