Study on comprehensive treatment of the hottest gl

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Research on comprehensive treatment of glass packaging waste

glass packaging containers have a long history. Later, with the rapid development of industrial technology, plastic packaging containers and composite packaging containers appeared, so glass packaging containers are in fierce competition with the above new material containers. You can also use it to drink water. However, the glass packaging container has many advantages, such as crystal clear texture, clean and beautiful appearance, good sealing, excellent chemical stability and so on

especially because the main raw material of glass is the extremely rich quartz sand and various ores in the earth's crust, and the price is low, so far the glass containers have not been excluded and eliminated, but have developed to a certain extent because of various new surface coating technologies and the trend of container lightweight. Common glass packaging containers include bottles (small mouth bottles, large mouth bottles, spiral sealed bottles, etc.), cans (for packaging canned food), cups and medical ampoules, etc

glass packaging waste refers to the glass packaging containers and materials that lose or complete the function of protecting the original value and use value of the contents and become solid waste; The comprehensive treatment of glass packaging waste refers to the treatment of glass packaging waste (i.e. reducing the volume of glass packaging waste that has been generated, etc.) and utilization (i.e. through recycling, processing, etc., the activities of collecting from the maintenance and monitoring materials of Jinan assay of glass packaging waste or transforming it into usable resources and other raw materials)

I. content of glass packaging waste in municipal solid waste

glass packaging container when it loses or completes the function of maintaining the original value and use value of its contents, it, like other packaging waste, becomes a solid waste and joins the ranks of garbage. Data show that the United States produces 150 million tons of domestic waste every year; In recent years, the amount of urban domestic waste in China has reached 150 million tons

taking Shanghai and Guangzhou as examples, Shanghai has produced about 10000 tons of urban domestic waste per day; Guangzhou has produced more than 5000 tons of municipal solid waste per day. About 1/3 to 1/2 of these municipal household garbage are packaging waste, of which glass packaging waste is about 5 ~ 10%. For example, packaging waste in the United States accounts for about 33% of urban domestic waste, Japan accounts for about 40%, EU countries account for about 30% to 50%, and China accounts for about 30% to 40%

second, the significance of glass packaging waste recycling

the glass recycling situation in the world is that about 30% of the glass is recycled in the United States; About 48% in France; About 76% in Germany; About 77% in the Netherlands

China is a country with a large population, a large consumption of glass containers, and a great lack of resources and energy. In 1999, the main product of China's plastic composite business was about 9million tons of glass containers made of PP mixed materials used in the automotive market, and its recovery rate was less than 20%, far less than that of industrialized countries. The recycling and reuse of glass packaging waste (some glass containers in the United States are recycled for about 8 times) or the development of new products can not only save mineral resources and reduce energy consumption, but also reduce the pollution to the environment (especially water and air)

in terms of saving mineral resources, each ton of broken glass can save 700 kg of quartz sand, 150 kg of limestone, about 160 kg of soda ash, and a total of 1200 kg of various raw materials; In terms of energy saving, from the perspective of the melting process of glass, if the raw batch is used, the chemical reaction is complex and the heat consumption is high. The heat consumption for making 1kg (1500 ℃) glass liquid is about 624 kcal

if the use of frit is mainly physical change, only 437 calories are needed to make 1 kg of glass liquid; In terms of time saving, the time of glass melting with complete powder is about 200 minutes, which can be shortened to 95 minutes after adding 1% broken glass; In terms of reducing atmospheric pollution, the glass batch will react chemically during high-temperature melting, which will produce toxic smoke and dust, such as arsenic compounds, fluorine compounds, lead compounds, cadmium compounds, etc. In addition, generally speaking, the gap of trapezoidal lead screw is relatively large, and dust will be generated during processing, preparation and feeding

all these will bring pollution to the atmosphere. The melting of broken glass is only a simple physical change process, so it can greatly reduce the pollution to the atmosphere. Because glass packaging waste has the above-mentioned economic and social benefits, the amount of broken glass used at home and abroad is gradually increasing, and 100% of the factories using broken glass have appeared in China. For example, the use of broken glass in glass factories in Beijing and Guangzhou has expanded to about 50 ~ 70%

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