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Method for separating and recycling valuable metals in powder rich in multiple metals of waste circuit board

A waste circuit board, separation and recovery technology, applied in the direction of improving process efficiency, etc., can solve the problems of complex metal enrichment powder components, immature supercritical technology, difficult deep separation and recovery of metals, etc.

Active Publication Date: 2012-10-24
广西自贸区西江资源循环科技产业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The multi-metal enrichment powder has complex components and a wide range of content fluctuations. Conventional technologies such as pickling and electrolysis are difficult to separate and recover metals in depth, while biological methods and supercritical technologies are not yet mature.
Some small enterprises simply crush the discarded circuit boards, dissolve base metals with sulfuric acid, and then dissolve precious metals such as gold and silver in them with reagents such as aqua regia, and use traditional hydrometallurgical processes to recover valuable metals in the solution and recover them from the solution. Metals and organic matter are mostly discarded. Although this method recovers the metal elements, a large amount of poisonous gas, waste acid and waste residue will be generated during the treatment process, which seriously pollutes the environment.

Method used

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  • Method for separating and recycling valuable metals in powder rich in multiple metals of waste circuit board
  • Method for separating and recycling valuable metals in powder rich in multiple metals of waste circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Low temperature oxidation melting

[0025] Take 5g of multi-metal enrichment powder shown in Table 1, weigh 21g of NaOH, NaNO 3 18g, mixed and placed at the bottom of a special crucible, sent to a well-type resistance furnace, and smelted at 450°C for 120min to obtain 43.44g of smelted product.

[0026] (2) Water leaching

[0027] Cool the smelted product obtained in step (1), add 20mL concentration of 30% oxidant H 2 o 2 , add water until the liquid-solid ratio is 7, stir and leaching at 300r / min for 60min, and leaching temperature at 40°C; filter to obtain primary leaching slag and primary leaching liquid; copper and antimony are enriched in the primary leaching slag (see XRD for primary leaching slag figure 1 ); the leaching rates of zinc, tin, and lead in the leaching solution reach 98.00%, 95.61%, and 92.53% respectively, and adjusting the pH value of the solution and evaporating and concentrating can obtain ZnO, SnO 2 and PbO crystals, and extract zinc, t...

Embodiment 2

[0031] (1) Low temperature oxidation melting

[0032] Take 5g of multi-metal enrichment powder shown in Table 1, weigh 21g of NaOH, NaNO 3 15g, mixed and placed at the bottom of a special crucible, sent to a well-type resistance furnace, and smelted at 500°C for 90min to obtain 39.65g of smelted product.

[0033] (2) Water leaching

[0034] Cool the smelted product obtained in step (1), add 30mL concentration of 10% oxidant H 2 o 2 , add water until the liquid-solid ratio is 7, stir and leaching at 300r / min for 120min, and the leaching temperature is 40°C; filter to obtain a primary leaching residue and a primary leaching solution; copper and antimony are enriched in the primary leaching residue; zinc, tin, and lead in the leaching solution The leaching rates reached 96.63%, 95.93%, and 91.21% respectively. ZnO and SnO can be obtained step by step by adjusting the pH value of the solution and evaporating and concentrating. 2 and PbO crystals, and extract zinc, tin and lea...

Embodiment 3

[0038] (1) Low temperature oxidation melting

[0039] Take 5g of multi-metal enrichment powder shown in Table 1, weigh 18g of NaOH, NaNO 3 15g, mixed and placed at the bottom of a special crucible, sent to a well-type resistance furnace, and smelted at 500°C for 150min to obtain 37.72g of smelted product.

[0040] (2) Water leaching

[0041] Cool the smelted product obtained in step (1), add water until the liquid-solid ratio is 7, and feed about 0.5 L O 3 , 300r / min stirring and leaching for 60min, leaching temperature 40°C; filtering to obtain primary leaching slag and primary leaching solution; copper and antimony are enriched in the primary leaching slag; the leaching rates of zinc, tin and lead in the leaching solution reach 98.35% and 95.72% respectively , 90.13%, adjust the pH value of the solution, and evaporate and concentrate to obtain ZnO and SnO step by step 2 and PbO crystals, and extract zinc, tin and lead in the leach solution according to the prior art.

...

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Abstract

The invention discloses a method for separating and recycling valuable metals in powder rich in multiple metals of a waste circuit board. The method comprises the following steps: (1) oxidizing and smelting at low temperature; (2) carrying out water leaching; and (3) leaching with Na2S to obtain leaching slag and two leachates finally, wherein copper and all noble metals are rich in the slag, the first leachate is alkali solution of Na2SnO3, Na2PbO2 and Na2ZnO2, and the second leachate is Na3SbS4 solution; and respectively recycling according to the prior art, wherein recovery rates of tin, antimony and zinc are more than 95%, the recovery rate of lead is more than 90%, the enrichment rates of the copper and the noble metals are high, and the metal loss is small. The method has the advantages of short process flow, reliable technology, environmental protection and low cost, and is an effective method for separating and recycling valuable metals from the waste circuit board.

Description

technical field [0001] The invention relates to a method for recovering valuable metals, in particular to a method for separating and recovering valuable metals in multi-metal enriched powder of waste circuit boards. Background technique [0002] In recent years, with the rapid development of the electronic information industry, continuous technological innovation and continuously expanding market demand have accelerated the upgrading of electronic products, resulting in a large amount of electronic waste, which has caused a huge threat to the global ecological environment. At present, my country has become the world's largest producer of electronic products and electronic waste. The disposal of electronic waste is an urgent problem to be solved in our country. Printed circuit board (PCB) is an important part of electronic products. Its composition includes organic substrates and electronic components containing high-grade metals mounted on the substrates. The main metal co...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00C22B3/04C22B11/00C22B13/00C22B15/00C22B19/00C22B25/00C22B30/02
CPCY02P10/20
Inventor 郭学益田庆华刘静欣李栋辛云涛
Owner 广西自贸区西江资源循环科技产业股份有限公司
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