For the 2020 Tokyo Olympics, Japan has proposed a plan to use precious metals extracted from old mobile phones and other products to manufacture about 5,000
medals required for the conference. As the first attempt in the history of the Olympics, the overall work on related projects has been fully launched. How to turn an 'old phone' into a 'medal'? 'Nihon Keizai Shimbun' reporter Nan Yiro gained a lot of unexpected gains through personal experience and visits. The 'Nihon Keizai Shimbun' website published the report sent back by the reporter on June 15. The summary is as follows: in the beginning of March when the rain One day, I made a special trip to the mobile phone sales outlet in Shinagawa, Tokyo. I was holding an old mobile phone made by Mitsubishi Electric in my hand. After completing the procedures in the store, the clerk skillfully used a drilling machine to make holes in the phone body-in order to clear personal information, my mobile phone is like this Be recycled. Usually, Olympic medals are made of precious metals mined from natural mines. For the Tokyo Olympics in 2020, the Japanese government called on citizens to participate widely by donating used mobile phones and home appliances, and then extract precious metals from these electronic components to make medals. . Such usable resources that are buried in electronic devices such as old mobile phones and waste home appliances are described as 'urban minesThis initiative aims to promote Japan’s image as a developed country for resource recycling to the world. The Tokyo Olympic Organizing Committee, NTT docomo, and the Japan Environmental Sanitation Center (Kawasaki City) will provide assistance in this project. Metallurgical companies are responsible for using recycled resources to manufacture gold, silver and bronze medals for the Olympic Games. The 2020 Tokyo Olympics will prepare a total of 5,000 gold, silver and bronze medals. A rough calculation requires at least 10 kilograms of gold, 1,230 kilograms of silver and 736 kilograms of copper, a total of 2 tons of precious metals. In addition, a certain degree of material loss and waste may occur in the production process, so the actual precious metal required may reach 4 to 6 tons. Then, how did the collected old mobile phones become precious metals? I visited a silver and copper refining factory. JX Metal Hitachi Office in Hitachi City, Ibaraki Prefecture is one of the largest silver and copper refining bases in Japan. It has a copper mountain in the Meiji era and has a long history. 'Please pay attention to safetyThe first thing the staff showed us was the recovered resources. After walking into the huge warehouse, what came into view was a mountain of debris from circuit boards, which came from recycled old mobile phones and waste home appliances. I also witnessed the refining site with my own eyes. The first thing I walked into was the copper refinery. The copper refining process is roughly as follows: first, the recovered resources and copper ore are used as raw materials to produce 'anode' copper plates, then the copper plates are immersed in an electrolytic cell, and high-purity copper is extracted through electrolysis. This refining process takes about 10 days. But the refining process does not end there. After the electrolysis, black 'precipitates' can be found at the bottom of the electrolytic cell, which is actually a rich ore. Namiki Satoshi, the head of the copper smelting department of Pan Pacific Copper, a subsidiary of JX Metals, said, 'There is a mixture of gold and silver that has not been extracted.' The precipitate is taken out, heated, and further processed into higher purity silver by electrolysis. When I saw the melted viscous silver flowing out of the furnace, I couldn't help but feel fascinated. I tried to pick up a piece of silver that was just finished, which was much heavier than I thought. Its size is equivalent to a 2 liter plastic bottle, but it weighs 29 kilograms. The copper and silver refined in this way are finally processed and will become real Olympic medals. Although we have seen copper and silver, we still want to see how gold is refined. After changing the location, we went to Ginza, Tokyo. This time we visited the Ginza head office of Tanaka Precious Metals, Japan, which is responsible for gold extraction in the medal program. In the showcase, there are dazzling golden ornaments and handicrafts. In fact, in the field of gold extraction through recycling, mobile phone recycling is very important. Generally speaking, to extract about 3 grams of gold, if it is a natural mine, about 1 ton of ore needs to be excavated. But if it is a mobile phone, it needs about 100. Regarding the significance of recycling, Kazuko Shimano, manager of TANAKA Holdings, the parent company of Tanaka Precious Metals, said, 'This is a highly efficient extraction method that does not consume energy.' A rare opportunity, I tried to take another gold nugget. Although it is only the size of a smartphone, it weighs 1 kilogram. By the way, according to the gold market of the day, the value is around 5 million yen.
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