Method for synthesizing metal products by using metal-bearing article

Abstract

The invention discloses a method for synthesizing metal products by using a metal-bearing article, which comprises the steps of: dissolving metal which is contained in the metal-bearing article with acid liquid and used for synthesizing metal products; and selecting a precipitation way of adding alkali or a burning way of adding fuel to obtain the metal products. The method does not comprise metal smelting and purifying steps and has the advantage of simple and consistent technical process.

Description

technical field [0001] The invention relates to a method for synthesizing metal products, in particular to a method for synthesizing metal products from metal-containing objects. Background technique [0002] The Printed Circuit Board (PCB) industry is one of the large-scale electronic industry parts manufacturing industries in China, and it is also the behind-the-scenes hero behind the rapid development of Taiwan's information electronics industry in recent years. Increase. Therefore, a large number of waste printed circuit boards are produced during the production process and after use of printed circuit boards. Usually, the composition of circuit boards includes about 75 to 90% of non-metals such as glass fiber and epoxy resin, and the rest includes about 6 to 30%. Metal components, of which copper has the highest content. In addition, the more layers of the circuit board, the more copper content. [0003] Compared with copper metal, copper oxide has stable quality and ...

AI Technical Summary

Problems solved by technology

The currently known waste resource treatment is limited to the recovery of pure metals or general metal oxides, for example, the use of electrolysis to produce metals, but the process must control the concentration of the electrolyte in order to effectively recover metals, and its products cannot It is sold as a product with a higher unit price. In addition, this method needs to provide a large amount of electricity and produce a large amount of waste acid, which is not helpful for environmental protection.

[0004] In addition, the current method of processing waste printed circuit boards is mainly through pyrometallurgy (pyrometallurgy) to recover valuable metals. However, the cost of pyrometallurgy technology and its furnace equipment is very high, about 1,400 yuan per metric ton. ~$1,600

Generally speaking, the pyrometallurgy of wastes may not require roasting steps, but still requires smelting, blowing, refining and other processes. Among them, the smelting steps must use traditional equipment such as blast furnaces, reverberatory furnaces, and electric furnaces. During processing, it is necessary to add quartz flux to remove impurities, and use coolant to absorb heat. In addition, there is also the problem of sulfuric acid gas pollution that is difficult to overcome.

Finally, fire refining and electrolytic refining are carried out to obtain high-purity copper, and the refined copper is pure metal copper. Even if the purity is high, the price can only reach the price of the London metal exchange market.

Moreover, the copper smelting wastewater discharged by this technology has caused heavy metal pollution in streams and rivers, and serious pollution in sea areas has resulted in stratification. The toxic sulfide gas discharged during the copper smelting process has also caused serious air pollution.

In addition, the problem of recycling metals by pyrometallurgy is that it is not economical to use smelting equipment to prepare metals. This equipment cannot be easily obtained, so recycling companies can only sell low and buy high and cooperate with other companies, which is not conducive to the concept and business of waste recycling. Moreover, the pollution problems caused by the implementation of pyrometallurgy are also extremely serious

[0005] On the other hand, if one wants to obtain high-purity metals from ores, the traditional metal mineral smelting technology must include multiple steps such as mining, beneficiation, heating and smelting, reduction, refining and forming, but this process not only consumes energy and Time, if you want to get nano-metal oxides or metals, additional processing is also required

Images