China waste plastic recycling and product
Categories: Solid Waste Disposal
China waste plastic recycling and product
In the plastic products produced every year in China, approximately 20%-30% belong to the plastic packing product and the plastic agriculture membrane which are have short use cycle, these plastic products are throw as garbage then become the municipal solid waste enter to the garbage disposal system, another part is discarded at will. Statistics indicated that our country city life trash annual output present has amounted to 120,000,000 tons, the waste plastic occupies 16%; Also indicated according to Beijing’s investigation, Beijing production trash 16,000 tons. And the waste plastic accounts for 5% (approximately 800t/d), the total quantity of plastic trash every year is 290,000 tons approximately. From the angle of sources use’s, it is also the precious renewable resources, the waste plastic’s recycling have the important society and the economic significance in saving the energy, reducing waste material volume, reducing the envinoment harm the waste plastic caused and suppressing the oil price.
Compound Wood - Woodiness fiber and Plastic
In China, waste plastic materials that can be produced are roughly listed below:
1. Makes the imitation wood
Thermosplastic waste plastics polyethylene (PE), polypropylene (PP) and polystyrene (PS) and so on are used in the civil engineering and as the building material, for example uses in the synthetic lumber, entering the hole cap, the simulation lumber and used as the crops support. Canada and Japan emerge to use the waste plastic system imitate wood ware’s development. For example Canada cooperates with the German Technology Company to develop the imitates the wooden technology, which is available to make use of waste plastic bag, bottle and membrane trash and so on , after shred, mixed, processed, the direct production is plate which is higher than the plank intensity, can bear the windblown and sunburnt, and the corrosion destroyed by insects. This plate is suitable to make the open-air table stool, the hanger plate, the roof, the highway soundproofing board, the roadside column and the sewer well covers and so on; A company named Ai Yin project Limited company in Japan developed a super compound lumber successfully which is using half waste plastic and half wood sawdust, the performance is better than the former, also the use is broader.
2. Makes the bituminous carpet and the plastic oil
To make some reaction of the polyethylene plastic and the coal-tar oil in the reaction still, under the catalyst existence, naphthalene in the coal-tar oil which has lower accumulation are easy has crossing linking with the chaining polyvinyl-chloride molecular and forms the two-dimensional network structure, thus causing softening point of the coal tar pitch modified enhances. Its performance surpasses the general petroleum bituminous carpet and the tar bituminous carpet, especially bears the low temperature flexibility to be good, is suitable for the northern area construction use specially. Its concrete operations step is: Joins the asphalt in the enamel reaction still, by 150 r/rain~200r/rain, the electrically operated agitation, and elevates temperature responds for 3 hours, joins the padding again, the agitation piece obtains the modified coal tar pitch immediately.
3. Makes 0reducing agents using in the iron-melting's blast furnace
The shreded waste plastic may use as reducing agents using under the iron-melting’s blast furnace replace of the coke the powdered coal. The first household user is a factory named Bremen Iron factory and steel plant started from 1995 to try to spurt, has amounted to 90,000 tons/years under the company DSD Corporation’s support, its Iron and steel company also started to try to spurt. Because the demand expands, the export of the mixed waste plastic in Germany has reduced from 205,000 tons in 1995 to 40,000 tons in 1997 and in 1999 stops the export. In Japan, steel products system business already started with this method to carry on the experiment. For example studies the experience from Germany in blast furnace injection aspect in NKK Corporation, constructed Jinghong Iron waste plastic pelleting installment (40.93m3 area) which produced 30,000 ton in 1997, according to 200kg/t spurting successfully, the Japanese steel and iron alliance gave the full affirmation, in 2010 lunar new year’s seasons the enterprise stipulate a motion plan independently that the injection reache 1,000,000 tons at the entire profession in 2010, are approximately equal to the steel and iron energy consumption account of 2%.
4. Waste plastic reheating and regenerative cycle
The heat circulation is to use the heat energy produced for heating or the electricity generation when the waste plastic and other combustible waste burns in the incinerator. This can save the resources effectively when difficulty have according to the plastic type separate collection. The waste plastic burns directly is one kind of substitute as the fuel of the powdered coal, from spurts above the coal hole the opening to spurt the waste plastic grain directly, uses for to take in cement kiln’s one kind of heat source, reduced the supplementary material use. This kind of technology may apply in the mix plastic. Waste plastic’s burning down needs the special combustion train, at present has developed successful has the bed type combustion furnace, the float combustion furnace and the fluidized bed type combustion furnace. The big city has through burning down ability which generates electricity with other combustible waste combination’s plastic (quantity of heat which occurs with this way produces high pressure steam to actuate turbine). The small and medium-sized town and cities are unable to establish the burning down installment, because in it collects the waste quantity which in the area coverage collects to be too few. Not only the US, Japan and so on developed country has used the garbage power plant; In China, some big city like Shenzhen, Guangzhou so on have trash power plant already.
5. Direct oiling
The technology of plastic direct oiling suits our country national condition. This technology need not use the clean using this technical worn out plastic, no need to separate just carries on the oiling directly. Waste plastic raw material is sufficient, and increases progressively year by year, looked from two aspects of economic efficiency and the social efficiency, it is good for the environmental protection, the energy indeed. Statistics indicated that if the nation has 1/10 worn out plastic transformed into gasoline and diesel oil every year, the national gasoline and the diesel oil will increase more than 50 ten thousand tons.
