Classification of waste aluminum recovery in China

The waste aluminum recovery in China is in urgent need of classification.

recycled aluminum has become the focus of development in recent years because of its energy-saving and environmental protection advantages. As a country lacking energy and resources, it is urgent for China to develop recycled aluminum. In recent ten years, recycled aluminum has also flourished in China with the development of aluminum industry. A number of renewable aluminum enterprises such as Shanghai Xinge and Zhejiang Wantai have been formed, which has also played a certain role in supporting and promoting China's sustainable development. But at the same time, there are also some urgent problems to be solved in the development of recycled aluminum. The low efficiency of resource utilization is a common problem at present

most of the recycled waste aluminum is aluminum alloy. There are mainly 8 series, of which 4 series are aluminum silicon series, 5 series are aluminum magnesium series, and 6 series are aluminum magnesium silicon series. They are series with high alloy composition and have high recycling value. However, at present, many domestic recycling enterprises do not consider the alloy composition of recycled waste aluminum and put all the waste aluminum into the furnace, which will not only destroy the alloy composition, but also reduce the grade of recycled aluminum and waste resources

take the pop-up can as an example. The pop-up can is a commonly used consumable. It is discarded after use and has a short cycle. The material used in cans is a high-grade aluminum alloy with high recycling value. After recycling, cans can be made into cans and reused for many times. At the same time, recycling cans can save a lot of electricity. The electricity consumed in the production of aluminum materials from waste aluminum is only equivalent to 5% of the electricity consumed in the extraction of aluminum from ore. The electricity saved by recycling a can can can take 3 hours for a 20 inch TV. Therefore, many countries, especially developed countries, attach great importance to the recovery and utilization of waste aluminum cans, and the recovery and reuse rate is also increasing

at present, the main ways to utilize the waste cans abroad are as follows: 1. Producing deoxidizer for steelmaking; 2. Production of recycled aluminum ingots; 3. Produce a product similar to pure aluminum ingot as raw material for alloy batching; 4. The aluminum alloy of the original brand (3004) is melted and directly used to produce cans. Among them, the best way is to use the waste cans to produce the original aluminum alloy. Two thirds of the cans currently used in the United States are smelted and produced from waste cans,

but there are problems in the resource allocation of the recycling of cans in China. So far, there is no enterprise in China that uses waste cans to produce the original brand of aluminum alloy. Most waste aluminum cans are used as additives in other fields or as non-standard aluminum ingots. Not many have been restored. This is because the recovery, storage and transportation, sorting, pretreatment and smelting process of waste aluminum cans in China are still in the stage of extensive production, which makes the cans, a high-value waste aluminum resource, degraded for use. In particular, small enterprises generally adopt the production mode of mixing, resulting in a waste of resource utility

with the economic growth and the improvement of people's consumption level, the demand for cans is also rising. At present, the annual consumption of aluminum cans is about 30billion, including more than 10billion in China. Every year, China produces at least 160000 tons of waste cans. It is predicted that in 2010, the aluminum used for cans in China will reach 290000 tons. Therefore, if these waste cans can be well recycled, it will have high environmental, resource and economic benefits

for a long time, the main technical obstacle to the utilization of waste cans in China is the paint layer, that is, the pretreatment of the upward movement of the open worktable. At present, Shanghai Xinge has explored in this area and is building the most advanced cans and aluminum scrap utilization system in the world. This system uses the "crushing equipment" for waste aluminum pretreatment. First, the waste cans are crushed, and then the waste gas with a temperature of about 400 ~ 550 ° C is introduced from the smelting furnace to conduct high-temperature treatment on the crushed cans. BASF's recent 1 series of expansion actions have also attracted endless associations in the industry, so that the coating on the surface of cans can be completely removed without new energy. At the same time, Shanghai Xinge has designed a secondary burner according to international standards, so that the materials that are still not fully burned after high temperature can be fully burned again. When the temperature reaches 1200 degrees Celsius, the dioxins can be destroyed, thus eliminating the pollution of dioxins to the environment. It is believed that as this system is put into use, it will make a big step forward in the recycling of China's waste cans

as the saying goes, "a skillful woman cannot make bricks without straw". At present, such problems also exist in the recycling of waste cans in China. Although most of China's cans can be recycled at present, because this recycling is spontaneous, no scientific recycling system has been formed, resulting in scattered market, unstable recycling channels and low resource enrichment, which has affected the utilization of waste aluminum cans

developed countries have made many attempts to improve the recovery rate of waste aluminum cans. The first is the deposit system for recycling cans, which is implemented in the United States, Sweden, Denmark, Norway, the Netherlands, Canada, Australia, Japan, Russia and other countries. The implementation of this system has greatly improved the recovery efficiency of cans. After Oregon implemented the deposit system, the recovery rate of beverage cans exceeded 90%, far higher than the average recovery rate in the United States. In Sweden, the government has imposed a deposit on all packaging containers, resulting in a recycling rate of 85% in a very short period of time

at the same time, these countries also attach great importance to the publicity of environmental protection, recycling and reuse. At present, environmental protection courses have been launched in Brazilian schools and colleges, and 400000 students use their spare time to collect waste cans. Some social welfare groups also organize environmental protection activities with some schools. Schools can exchange the collected cans for computers, teaching equipment or food. Sweden has also established cooperative relations with all relevant social groups and institutions, often holding large-scale publicity activities, making a series of films and television publicity films and advertisements, so as to improve people's awareness of environmental protection

at present, China has no special regulations on the recycling of cans, and only treats them as ordinary waste materials. Therefore, in view of the high value of the recycling of cans, the state should formulate policies to support and support the recycling of waste cans, so as to make more rational use of waste metals and form a virtuous circle by raising the recycling price and legislating special recycling of waste cans

it can be seen that if the waste metal can be intensively and differently recycled, it will produce more considerable economic and social benefits, and the resources will also be used more effectively. Therefore, China should introduce measures as soon as possible to intensively and differently recycle waste metals, so that the "urban mine" of waste metals can be used more effectively

source: medium color