Many problems to be solved in transforming the hot

2022-09-21
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Waste glass into resources: many problems to be solved

facing the waste glass just replaced by residents in the community, master Jia murmured, "no one wants this thing, 25.1 kilograms, which is not enough for oil money."

master Jia comes from Anhui and makes a living by collecting waste products. "One yuan for waste paper (one kilogram) and one yuan for waste iron." He pointed to the pile of waste glass, "I can't make money."

in March this year, the Ministry of Commerce required all regions to fully implement the construction of renewable resource recovery system in the form of a notice. The notice stressed that the significance of recycling renewable resources is far higher than the economic and social benefits it generates, and the construction of renewable resources recycling system must be effectively promoted from a strategic and overall perspective. The recycling of waste glass has also been mentioned many times in this knowledge for expanding the steel structure market

according to statistics, 1500 tons of waste glass are thrown away in Beijing every day, and the expenditure of the environmental sanitation department for this purpose will exceed 100000 yuan. If all the waste glass products in Shanghai can be recycled every year, it will bring an income of nearly 300million yuan

"to whom? If someone wants it, it won't be so low." Master Jia's words show the reason why these "misplaced resources" have not been better developed and utilized

waste glass is a resource

waste glass can be divided into daily waste glass (utensil glass, bulb glass) and industrial waste glass (flat glass, glass fiber) according to its source. After the recycled waste glass is classified and cleaned, the flow rate of one part directly affects the speed of the material testing machine. After being selected, the waste glass can be directly reused, such as mirror making and glass finishing materials. It is conservatively estimated that waste glass accounts for 5% of domestic waste, and the annual production of waste broken glass in the flat glass manufacturing industry alone is more than 2 million tons

each ton of recycled waste glass can save 100 kg of fuel. The energy saved by reusing a glass bottle can make the bulb light up for 4 hours. Therefore, the social and economic benefits brought by the recycling of waste glass will be very considerable

it has also been estimated that the bottle and can company can use recycled glass particles to produce glass bottles and cans, which can save 682 kg of quartz sand, 216 kg of soda ash, 214 kg of limestone, 53 kg of feldspar powder, 1000 kg of standard coal and more than 400 kwh of electricity per ton, equivalent to reducing the cost by 980 yuan. For flat glass manufacturers, if a large number of broken glass is used, the service life of the furnace will be extended by 15% - 20%. The recycling of waste glass can not only save disposal costs and land for environmental protection departments, but also reduce environmental pollution. According to the authority, when the content of cullet used accounts for 60% of the total batch, air pollution can be reduced by 6% - 22%. There is no doubt that waste glass can become a resource if it can be recycled

facing such a promising industry, various research institutions and enterprises at home and abroad have done a lot of research on the recycling of waste glass. After crushing, pre molding, heating and roasting, the waste glass can be made into various building materials, such as glass mosaic, glass facing brick, glass artificial stone, foam glass, microcrystalline glass, glassware, artificial colored sand, glass beads, colored glass balls, glass ceramics products, high-temperature adhesives, etc. With the maturity of technology and the increase of scientific and technological investment, the field of using waste glass continues to expand, and the variety also increases

due to various reasons, the recycling of waste glass has not really realized industrialization so far. Enterprises in Shanghai, Tianjin and other places have long tried to recycle waste glass and achieved good results. However, the utilization of waste glass did not form a climate in these places, but was only used as a model or example of renewable resources utilization by the local government, which played a more vase role

"the recovery rate of waste glass in China is only 13%, and a large number of waste glass has not been effectively recycled." Jiang Zengwei, Vice Minister of the Ministry of Commerce, believes that the recycling of renewable resources still has a long way to go. The glass recycling plan implemented by developed countries in Europe is very effective. At present, the annual recycling volume of bottle glass in Western European countries has exceeded 9million tons. The recycled glass in various countries saves nearly 50% of the raw materials required for melting glass products in the region. At present, the scale of renewable resources industry in developed countries has reached US $600billion, and it is expected to reach US $1800billion in 2010

absence of recyclers

it is understood that there is no special waste glass recycling and processing plant in Beijing at present. Without this channel, those "resources misplaced" can only lie there as garbage

interviewed Beijing Yiqing Environmental Sanitation Engineering Group Co., Ltd. and Beijing Erqing Environmental Sanitation Engineering Group Co., Ltd., and the answer was that there was no special sorting equipment and steps to sort waste glass in domestic waste. However, the two largest waste removal and resettlement enterprises in Beijing only use incineration and landfill treatment for all kinds of domestic waste and waste. In Majialou waste transfer station, a large number of waste glass and domestic waste are mixed together, which are divided into three parts according to the particle size in the screening workshop and sent to the composting plant or landfill. Large pieces of glass are broken and then buried with other garbage

some of the waste glass produced in life is buried by the environmental sanitation department, while the other part is sent to the waste collection station through various ways. Almost all of these scattered collection stalls are operated by individuals. Even those stalls that can make some money from waste glass are difficult to form a scale, which can not guarantee stable supply and will also cause great waste in the circulation process. More importantly, due to the lack of primary processing capacity, these stalls cannot form long-term and effective cooperation with flat glass factories or other waste glass recycling enterprises

according to insiders, generally speaking, most flat glass factories only use the broken glass formed by their own factory, and do not easily use outsourced waste glass. The purpose of this is to ensure the stability of product quality. In the field of glassware manufacturing, especially in the light industry glassware system, when encouraging state-owned enterprises and private enterprises to promote each other and military civilian integration to build dark green bottles and cans, generally 2.80% - 38.1% of the purchased waste glass can be used, while 4.7% - 25% of the purchased waste glass can be used in the manufacture of semi white bottles and cans. This person also believes that the use of flat testing machine: impact testing is very sensitive to the structural defects of metal materials, while plate glass, high-grade utensils and colorless glass bottle factories mostly do not use outsourcing to recycle waste glass

if there is an intermediary organization to collect waste glass and carry out primary processing, the utilization rate of waste glass can be greatly improved. At present, China building glass and industrial glass association is carrying out this work. Li Hui, the person in charge of the project, introduced that the project is not very complicated from the technical level, and the key needs to be jointly promoted by the whole society and various functional departments. The project carried out by the association is to grade and package waste glass after cleaning, crushing, magnetic separation and other work, which can be used in flat glass, glass bottles and cans, plastics, road surface and other fields. This can provide a stable source of goods for the field of waste glass reprocessing and make waste glass become raw materials

how does economic leverage work

"recycling enterprises only pay attention to economic benefits and ignore social benefits, 'benefit the big and rush to collect, benefit the small and collect less, and do not collect without profit'. No one is willing to buy waste glass, waste plastics, waste miscellaneous bones and other varieties with small profits, which are basically discarded with garbage." Jiang Zengwei, Vice Minister of the Ministry of Commerce, revealed the deep reasons for the difficulty in recycling waste glass

how to make waste glass recycling profitable and attract more enterprises to enter the field of waste glass utilization to promote recycling has become a concern of all parties involved in waste glass recycling. It is understood that the state is currently studying the establishment of a promotion system conducive to the development of renewable resources recycling industry, studying and increasing public financial support for renewable resources recycling, and providing necessary support in credit and other aspects

according to relevant sources of the Ministry of Commerce, the state will also give strong support to the recycling of renewable resources that are not easy to recycle but have poor economic benefits but significant social benefits. The source said that the State encourages enterprises to recycle in policy; At the same time, for the demonstration projects of renewable resource recovery system construction, the government should give financial subsidies and loan interest subsidies to play the guiding role of government investment in social investment

I have read the relevant provisions on tax reduction and exemption for waste utilization, and I haven't seen the detailed provisions on tax reduction and exemption for waste glass recycling at present. For the waste glass recycling industry, which has no serious pollution and obvious economic benefits, it is difficult to imagine that the private sector is willing to actively invest in this industry without policy preference or support

"the composition of waste glass itself is very complex, there are many varieties, and the products are immature. If there is no effective incentive mechanism, no one has the incentive to invest in research and development." A well-known old expert in the industry expressed his concern to

recycling box

a lot of foreign experience can also provide us with reference for the recycling of waste glass. One of them is to set up waste glass recycling containers. Britain, Denmark, Sweden, Switzerland and other industrialized countries have been recycling waste glass since the 1970s, and waste glass recycling containers have been set up in glass factories, urban residential areas and social public places. The UK established a glass recycling center at the end of 1977 to increase the utilization rate of waste glass. Urban residential areas, parks, shops, factories, bars and other places in Germany,

source: China Building Materials News

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