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A method for selective leaching and precipitation recovery of palladium in printed circuit boards

A printed circuit board, selective technology, applied in the direction of improving process efficiency, etc., can solve the problems of cumbersome operation, low palladium adsorption efficiency, and many impurities in palladium, achieve good selectivity, reduce the difficulty of treatment and recovery, reduce leaching and Precipitation effect

Active Publication Date: 2021-03-30
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concentrated roasting method and copper / iron replacement method are cumbersome to operate, easy to produce toxic gas, palladium contains more impurities, activated carbon adsorption method needs pretreatment, desorption and regeneration, and the adsorption efficiency of palladium is low

Method used

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  • A method for selective leaching and precipitation recovery of palladium in printed circuit boards
  • A method for selective leaching and precipitation recovery of palladium in printed circuit boards
  • A method for selective leaching and precipitation recovery of palladium in printed circuit boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using the pins in the waste computer CPU as the raw material, the experimentally measured metal content (%) is shown in Table 1:

[0024] Table 1

[0025]

[0026] Extraction process such as figure 1 Shown: Weigh 1g of needles into 10ml of N,N-dimethylformamide solvent containing 1mol / L anhydrous copper bromide, and leaching for 90min. After the leaching is completed, filter, add 10ml of dimethylglyoxime ethanol solution with a concentration of 0.2mol / L in the leaching solution, and the palladium ions in the leaching solution will precipitate. The leaching rate was 85%, and the precipitation rate of palladium was 98.5%.

Embodiment 2

[0028] Using waste computer CPU substrates as raw materials, the experimentally measured metal content (%) is shown in Table 2:

[0029] Table 2

[0030]

[0031] Extraction process such as figure 1 Shown: Put 1 g of computer substrate particles crushed to 100 mesh into 20 ml of N, N-dimethylacetamide solvent containing 1 mol / L anhydrous copper bromide, and leaching for 90 min. After the leaching is finished, filter, add 20ml of dimethylglyoxime ethanol solution with a concentration of 0.1mol / L in the leaching solution, and the palladium ions in the leaching solution will be precipitated. The leaching rate is 80%, and the precipitation rate of palladium is 97%.

Embodiment 3

[0033] Using multilayer ceramic capacitors as raw materials, the experimentally measured metal content (g / Kg) is shown in Table 3:

[0034] table 3

[0035]

[0036] The extraction process is as shown in 1. The material is ball-milled and sieved to 200 meshes for subsequent use. Take 1 g of the ground material and put it into 20 ml of N, N-dimethylformamide solvent containing 1.5 mol / L anhydrous copper bromide. The leaching time is 90min, filter after leaching, the leaching rate of palladium is 84%, add 16ml concentration of 0.1mol / L butyl xanthate solution in the leaching solution, the reaction temperature is 75°C, the precipitation reaction time is 60min, filter Palladium xanthate was obtained, and the palladium precipitation rate was 98.1%.

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PUM

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Abstract

The invention discloses a method for selectively leaching and precipitating to recover palladium in a printing circuit board. The method comprises the following steps of with a waste circuit board anda component as raw materials, adding an anhydrous organic solvent-bromide system to perform a selective leaching reaction, wherein the reaction time is 30-90 min, filtering after leaching is completed, and adding a selective precipitator in a filtered leach liquor to precipitate palladium in the leach liquor to realize the purification and enrichment of palladium. The method is simple in process,high in selectivity, high in recovery rate, and low in cost, avoids the use of a large amount of toxic and harmful solvents such as strong acid, and meanwhile, reduces the leaching and precipitatingof other metals, and reduces the subsequent metal treatment recovery difficulty.

Description

technical field [0001] The invention relates to a method for selectively leaching, precipitating, and recovering palladium in printed circuit boards, and belongs to the technical fields of metal recovery and solid waste recycling. Background technique [0002] my country has a large population and generates a huge amount of electronic waste. As the replacement time of electronic products accelerates, the amount of electronic waste is intensified. Professor Li Jinhui made a conservative estimate of the electronic waste market in my country. By 2020, the generation of electronic waste will The volume is expected to reach 10 million tons per year and 20-25 million tons in 2040. The disposal of electronic waste has become an urgent problem in the world. Printed circuit boards are used in almost all electronic and electrical products. Therefore, the disposal of printed circuit boards is the key to the disposal and utilization of electronic waste. According to reports, the LCD scr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/006C22B11/046Y02P10/20
Inventor 张承龙周永杰王瑞雪马恩白建峰王景伟
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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