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Preparation method for self-repairing lubricating grease by recovering nano copper powder from waste circuit boards

A technology of waste circuit boards and nano-copper powder, which is applied in lubricating compositions, improvement of process efficiency, petroleum industry, etc., can solve problems such as low equipment requirements, secondary pollution, and difficulty in leaching, and achieve low cost and decentralized Good performance and simple experimental operation

Inactive Publication Date: 2019-07-19
JINLING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pyrochemical recovery of copper, although the process is simple, but a large amount of polluting gas will be produced during the incineration of circuit boards; although the mechanical method does not have the risk of polluting the environment, it can only roughly separate metals and non-metals; and wet treatment of waste Printed circuit boards can not only achieve high metal recovery and metal purity, but also require less equipment
In wet recovery, the leaching agent can only act on the exposed metal surface during the extraction process. If the metal is wrapped by corrosion-resistant materials such as ceramics, it is difficult to leach out; the leaching solution and residue are corrosive and toxic, and if not handled properly, it is easy to cause More serious secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Extraction of copper sulfate pentahydrate crystals from waste circuit boards containing copper:

[0038] Step 1, using a grinder to pulverize copper-containing waste circuit boards to an average particle size of about 1 mm;

[0039] Step 2, the powder raw material is pre-sorted on a hydraulic shaker, and the heavy-density metal component and the light-density non-metallic component are sorted out according to different densities, and the heavy-density component is the metal raw material in the leaching process;

[0040] Step 3, anhydrous copper sulfate 6.25g / L, HCl concentration 130g / L, n-butylamine concentration 36g / L, stirring speed 300rpm, temperature 50°C, leaching time 5h, the leaching efficiency of copper in waste circuit boards is as high as 97.7% .

[0041] Step 4, the concentration of the extractant LK-C2 is 18% (volume fraction), the extraction time, the initial pH value is 3, the ratio of the organic phase to the water is 1:1, the extraction time is 4min, af...

Embodiment 2

[0044] Copper sulfate pentahydrate crystals to prepare nano-copper powder:

[0045] Weigh 60 g of copper sulfate pentahydrate prepared in Example 1 and 6 g of PVP and dissolve them in 1 L of deionized water in a beaker to form a copper ion solution, adjust the pH value to 11 with ammonia water to form solution A. Another 9.06 g of sodium borohydride was weighed and 1 L of deionized water was added to form solution B. The solution B was slowly dropped into the solution A, and magnetically stirred at a constant temperature of 50° C. for 1 hour to prepare a copper powder suspension. Next, the copper powder suspension was centrifuged to separate Cu particles, washed three times with deionized water and once with absolute ethanol. Finally, vacuum-dry at 40°C to obtain pure copper powder with a purity of 99.91%. The average particle size of the copper powder measured by TEM is 23nm.

Embodiment 3

[0047] Copper sulfate pentahydrate crystals to prepare nano-copper powder:

[0048] Weigh 60 g of copper sulfate pentahydrate prepared in Example 1 and 3 g of PVP and dissolve them in 1 L of deionized water in a beaker to form a copper ion solution, adjust the pH value to 11 with ammonia water to form solution A. Another 4.53 g of sodium borohydride was weighed and added to 1 L of deionized water to form solution B. The solution B was slowly dropped into the solution A, and magnetically stirred at a constant temperature of 50° C. for 1 hour to prepare a copper powder suspension. Next, the copper powder suspension was centrifuged to separate Cu particles, washed three times with deionized water and once with absolute ethanol. Finally, vacuum-dry at 40°C to obtain pure copper powder with a purity of 99.90%. The average particle size of the copper powder measured by TEM is 52nm.

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Abstract

The invention relates to a preparation method for self-repairing lubricating grease by recovering nano copper powder from waste circuit boards. The method comprises the following steps: crushing wastecircuit boards containing copper, and sorting the crushed raw material by using a hydraulic shaking table; separating metal-enriched powder through density difference; then ionizing metal by using aleaching agent, extracting copper sulfate pentahydrate by using extraction and back extraction, further extracting and separating the nano-metal copper powder by using a liquid phase reduction method,and then conducting saponification reaction to prepare the lubricating grease. The additional value of the recovered copper powder is improved by applying the nano-copper powder to the lubricating grease to realize a self-repairing function. The nano-copper powder prepared by the method is good in dispersity, can be used in lubricating grease, operation is simple and the cost is low.

Description

technical field [0001] The invention relates to a method for recycling copper powder, in particular to a method for recycling nanometer copper powder and self-repairing lubricating grease by using waste circuit boards. Background technique [0002] From the perspective of resource recovery, circuit boards have high potential value and are rich in resources containing rare and precious metals such as gold, silver, platinum, and rhodium, as well as basic metals such as copper, iron, aluminum, zinc, and nickel. Recycling metals from e-waste produces less secondary waste than mine-extracted metal production, and waste circuit boards contain higher-grade precious metals than those found in fine gold mines. However, circuit boards are the most complex and difficult to dispose of in electronic waste due to the close combination of metal and non-metal and difficult separation. [0003] The recycling technologies of waste printed circuit boards mainly include fire method, pyrolysis ...

Claims

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Application Information

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IPC IPC(8): C10M169/06C22B7/00C22B15/00C22B3/30C10N30/06C10N50/10
CPCC10M169/06C10M2201/14C10M2207/1285C10N2030/06C10N2050/10C22B7/007C22B15/0069C22B15/0089C22B3/30C10N2010/02Y02P10/20
Inventor 张小敏
Owner JINLING INST OF TECH
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