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The continuous advancement of human civilization has brought heavy burden on the earth. According to relevant statistics, 1.3 billion tons of food garbage and 50 million tons of electronic garbage world will have globally.
Food waste is relatively easy, but electronic garbage is often a headache. Waste batteries are typically treated by extreme heating (more than 500 ¡ã C) to smear some valuable metals, but this process tends to exude harmful toxic gases. Recently, Scientists from Nanyang University of Technology, Singapore have developed a new approach, using peel waste from the wastely lithium ion battery, and uses these heavy metals to make new lithium-ion batteries.
The results of this study were published in "Environmental Science and Technology". Through this method, the waste battery can not only solve the problem of food waste and electronic waste, and the process does not have harmful gases, and the solid residue that occurs is also considered to be non-toxic, which indicates that the method is harmless to the environment. Researchers in Nanyang University of Technology said that further research is being processed to optimize the charging and discharging of these new batteries made of recycling materials.
Tricky waste battery recycling problems have huge impact on the environment. The scientific survey shows that a normal battery is discarded in a large self, it can pollute 600,000 water, which is equivalent to the water consumption of a person, and my country has to consume such a battery approximately 7 billion. Not just my country, this problem also plagues other places in the world.
Therefore, researchers around the world are studying various methods for treating waste batteries. For example, an alternative method of extracting a strong acid solution or a weak acid solution with a hydrogen peroxide, but these methods still have secondary pollutants, constitute health and safety risks, or depends on danger and unstable hydrogen peroxide. Recycling battery scraps in harmful pollutants by industrial methods, i.
e., as a wet metallurgy method for extracting solvents, is increasing as a possible alternative to exploration. This process first pulverizes the waste battery to form a crushing material called a black material, and then dissolves it in a mixture of strong acid, weak acid and other chemicals such as hydrogen peroxide, by high temperature, from the black matter Extract valuable metal.
Regarding this approach, the Daltontay Assistant Professor of the School of Materials Science and Engineering, Nanyang University of Science and Technology, said that although this method is more environmentally friendly, this type of strengthening society may be used in industrial scale. A large number of secondary pollutants have a major safety and health risk. In this latest papers, the research team found that the oven drying and grinding the powder of the powder and a weak organic acid-citric acid found in citrus fruits - citric acid can achieve the same goal.
Low-cost, sustainable methods In the laboratory test, the research team found that their methods successfully extracted approximately 90% cobalt, lithium, nickel and manganese from the wastely lithium ion battery, this effect and use peroxidation Hydrogen method is quite. ChoryongTay, the author, Nanyang University of Technology Energy Research Institute, explained that the key to this method is the cellulose in the orange peel, during the extraction process, it will be converted to sugar after heating. These sugar can promote recovery metal from battery waste.
Naturally, antioxidants, such as flavonoids and phenolic acids, also help this enhancement. More importantly, the solid residue in this process is discovered to be non-toxic, which indicates that the method is harmless to the environment. Moreover, from the recycled material, the research team is assembled from a new lithium-ion battery to show the charging capabilities similar to commercial batteries.
The researchers said that this indicates that new technologies are actually possible in industrial significance. ". Further research is underway to optimize the charging and discharging process of these new batteries made of recycling materials.
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