Method for extracting metallic copper from waste circuit boards
A technology of waste circuit boards and extraction method, which is applied in the direction of improving process efficiency, can solve the problems of low product quality and low extraction rate of metal copper, and achieves the effects of high extraction rate, simplified subsequent treatment process and less impurities.
Inactive Publication Date: 2017-05-31
YANGTZE UNIVERSITY
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Problems solved by technology
[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for extracting metal copper in waste circuit boards, to solve the problem of low extraction rate of metal copper in existing waste circuit boards (WPCB) and the need to use extractants. The problem of low product quality
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Embodiment 1
[0019] The waste circuit board WPCB was crushed, and 1.0 g of the waste circuit board WPCB powder was weighed, respectively placed in a three-necked flask, and 80 mL of ammonia water, ammonium salt and triethanolamine were added in a mass ratio of 4:2:2.5. The ammonium salt is ammonium chloride, which is heated to 60°C for 4 hours under vigorous stirring, and the leachate is obtained after filtration; the pH of the leachate is adjusted to 1.0 with hydrochloric acid, and 1.0 g (NH 4 ) 2 C 2 o 4 , and a precipitation reaction occurred at 60°C for 60min; the obtained precipitate was calcined in a tube furnace at a constant temperature of 400°C for 4h under a nitrogen atmosphere, and then cooled with the furnace to obtain metallic copper powder.
[0020] The extraction process of embodiment 2,3,4,5 is the same as embodiment 1, and difference is that extraction condition and used ammonium salt are respectively NH 4 HCO 3 , (NH 4 ) 2 SO 4 , and (NH 4 ) 2 CO 3 , NH 4 HCO ...
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The invention discloses a method for extracting metallic copper from waste circuit boards. The method is characterized in that the method comprises the following steps that (1) crushed waste circuit boards serve as raw materials, a mixed solution of ammonium hydroxide, ammonium salt and amine compounds serves as a leaching agent, the leaching reaction is conducted under the temperature of 20-90 DEG C, and a leaching solution is obtained after filtering; (2) the pH of the leaching solution obtained in the step (1) is adjusted to be 0.5-3, oxalate is added, the precipitin reaction is conducted under the temperature of 30-80 DEG C, and precipitates are obtained after centrifugal separation; and (3) the precipitates obtained in the step (2) is subjected to constant-temperature calcination for 1-10 h under the temperature of 200-500 DEG C, and a product is obtained after cooling. According to the method for extracting the metallic copper from the waste circuit boards, through the ordinary-pressure ammonia leaching method, the oxalate and foreign ion in the solution are utilized to form a complex compound and the copper salt precipitates for extraction of the metallic copper from the waste circuit boards WPCB, the extraction ratio is high, the technique is simple, and cost is low.
Description
technical field [0001] The invention relates to the field of recycling and utilization of metal resources in waste circuit boards (WPCB), and more specifically, relates to a method for extracting metal copper in waste circuit boards. Background technique [0002] With the advent of the information age, the development of electronic technology has brought about rapid changes in people's lives. People's demand for electronic products is increasing, but at the same time, a large amount of solid electronic waste has also been generated, which has brought huge environmental problems. Generally speaking, the average iron content in waste circuit boards (WPCB) is 27.3%, copper content is 16.4%, aluminum content is 11%, and it also contains a certain amount of precious metals, which are much higher than ordinary It can be said that it is a "mine in the city". Among them, scrap copper, as a unique form of copper resources, can become an important supplementary source of copper reso...
Claims
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Login to View More IPC IPC(8): C22B15/00C22B7/00
CPCC22B7/008C22B15/0078C22B15/0089Y02P10/20
Inventor 肖围张志欣王脂胭缪畅颜学敏梅平
Owner YANGTZE UNIVERSITY