Research on Recycling of Waste Packaging Barrels Text / nectar Abstract: This paper briefly describes the current status of recycling and recycling of waste packaging barrels in China. The shortcomings and application scope of the two kinds of waste packaging barrel regeneration processes (wet cleaning process and dry process) are introduced. The process route of dry recycling of waste packaging containers with high energy, energy saving and environmental protection effects. Key words: waste packaging container; hazardous waste; recycling Waste packaging drums generally have rust, deformation, internal bond oil residue or chemicals. They are randomly discarded or stacked in the open air, which will cause air pollution in the surrounding environment, and leaching with rainwater will pollute water and soil, especially Waste packaging drums containing hazardous waste or contaminated hazardous waste shall be subject to HW49 according to China's National Hazardous Waste List and require professional disposal. Currently widely used 200L steel drums are generally made of materials with a thickness of 1.0 to 1.2 mm, and most of them can be recycled and reused many times. 1. Status of waste packaging recycling technology at home and abroad At present, the developed recycling barrel factory has basically realized the automatic production line. The foreign single-flow line has 400,000 recyclable barrels per year, and the per capita annual regeneration and repair is 20,000 barrels. The annual output of manual production in China is about 2,000 per capita. There is a huge space for promoting the production process of automated regenerative barrels in China. The utilization rate of recycled scrap steel in developed countries is about 75% in the US and 60% in Japan. The recycling rate of scrap steel barrels in China is only about 15%. The two main types of regeneration treatment for scrap barrels are dry treatment and wet treatment. (1) Dry processing. The residue in the barrel is removed by heat treatment combined with mechanical cleaning, which accounts for about 20% of the treatment volume. The main processes are: heating and polishing to remove the residue → shot blasting polishing → shaping → leak detection → surface painting. The advantage is that no waste water is produced, and the main disadvantage is that the energy consumption is relatively high, and the exhaust gas needs to be purified. (2) Wet treatment. Washed with water or solvent, accounting for 80% of the treatment. The main processes are: water or solvent scrubbing residue → sanding → drying → shaping → surface painting. The main advantage is that it has a wide range of application, and the drum can be cleaned by chemical cleaning agent washing and water washing according to different pollution characteristics. The advantage is that it has wide applicability, and the main disadvantage is the generation of waste water and waste liquid. Subsequent processing is required. At present, the production scale of domestic related scrap barrel recycling plants is large, but the production process and equipment are backward, mainly based on manual operation, low production efficiency, serious pollution, and the quality of products cannot be guaranteed. In recent years, there has been a recycling line of dry scrap steel drums with a high degree of automation, which has a large processing scale, low energy consumption and is more environmentally friendly. The annual processing capacity of 100,000 scrap steel barrels is about 115kw, the water consumption is about 50t/d, the consumption of various cleaning agents, rust removers, etc. is 5t/a, the coating is nearly 20t/a, and the treatment cost is about 50 yuan/piece. . It processes 100,000 waste steel barrel dry treatment plants annually, with an electrical load of about 170kw, water consumption of 20t/a, and various paints and paints of 20t/a. The recycling cost of waste packaging barrels is 20-50 yuan/piece. The secondary waste in the process of recycling the waste drum is mainly waste water and waste gas. The waste water mainly comes from the residual waste liquid in the barrel and the chemical treatment waste liquid generated when the barrel is cleaned. The characteristics of the waste water depend on the nature of the items contained in the barrel and the type of the cleaning agent, and are usually treated by physical and chemical processes such as neutralization and redox. The exhaust gas mainly comes from various harmful gases generated by the waste liquid of the waste barrel and the volatile liquid of the treatment liquid and the organic solvent waste gas generated by the painting process of the steel drum, and is usually treated by an adsorption and absorption process. 2, wet processing The general process of wet processing of scrap barrel is: sorting → residue residue extraction → pre-cleaning → chain washing → external cleaning → shaping → internal cleaning → barrel drying → air replacement → internal replacement → shot blasting → airtight inspection → Spray paint → baking paint drying → air replacement → installation of the lid → storage in storage. (1) Sorting: The purpose of the scrap barrel screening is to remove the non-regenerated barrel rust and the unwashable empty barrel. (2) Residual liquid extraction: The residual liquid in the barrel is extracted by using an air compressor, and the residual liquid after the removal is temporarily stored according to the hazardous waste treatment regulations, and should be sent to the hazardous waste disposal center as hazardous waste. (3) Pre-cleaning: Pre-clean the inside of the barrel with a small amount of hot water and a detergent with a concentration of 5% before entering the formal cleaning. (4) Chain washing: This process is only for waste industrial containers such as resin drums with a relatively high viscosity of the contents. It can be cleaned by rotary grinding using a multi-ribbon chain and a small amount of detergent-containing tap water. (5) External cleaning: Rinse the barrel with tap water to remove residual objects from the barrel. (6) Barrel edge shaping: The upper and lower curling sides are corrected by using a reeling wheel. (7) Barrel shaping: The air pressure is added to the barrel to expand it, and the pinch wheel is used to rotate and pressurize, so as to repair the unevenness of the barrel. (8) Internal cleaning: The machine nozzle is used to spray steam or water into the barrel through the barrel mouth for cleaning several times, and then use steam, detergent water, pure water for cleaning, and spray rust inhibitor. After the cleaning water is treated by oil separation, it will not be discharged after being recycled. The oil will be exchanged once every time. In addition to regular detergent addition, there is no other raw material consumption in the cleaning stage of the cleaning agent. Organic hazardous waste packaging drums are often cleaned with drums that cannot be cleaned with water, hot water and alkaline water, and can be used to reduce the consumption of single-bucket cleaners to around 0.25kg by recycling. (9) Drying inside the barrel: The water adhering to the inner wall of the barrel is evaporated in the steam drying furnace. (10) Air replacement: After drying, the air in the barrel also contains a large amount of water vapor. The water vapor in the barrel needs to be sucked out, and the dry air is injected into the barrel to prevent rust after condensation. (11) Internal inspection: Screen the regeneration drum for rust, residue, water droplets, etc. (12) Shot blasting treatment: Screw the steel drum that has passed the inspection onto the lid of the bucket, and peel off the paint of the steel drum by shot blasting with a steel ball of Φ 0.6 to 1.0 mm. (13) Airtight inspection: The air pressure difference, water, ultrasonic wave and other methods are used to detect the presence or absence of leaks in the steel drum. (14) Painting: The steel barrel after the shot blasting is applied to the customer-specified color. Amino alkyd lacquer was used and 20% dilution solvent was mixed. (15) Baking paint drying: After the painting is finished, the sprayed barrel is sent to the baking furnace through a fully enclosed transmission device, and dried at 150 ° C or above to form a coating film. (16) Air replacement: After the steel copper after spraying is baked, the hot air in the barrel is extracted. 3, dry processing The process flow of the automatic dry scrap barrel recycling production line is shown in Figure 1. Figure 1 Flow chart of dry processing of scrap barrel Firstly, the pre-treatment of the refurbished waste steel barrel is carried out, and the falling cover processing equipment is used to clean the residual material in the barrel; the two pairs of waste steel barrels are heated to volatilize or soften the remaining residue in the barrel, and at the same time, through the grinding equipment The residue in the barrel is removed; after that, the bottom of the barrel is processed to remove the residual material in the barrel; then the stripping treatment is performed to make the outer surface of the barrel uniform, avoiding the rust of the steel barrel and improving the processing quality and service life of the steel drum; After the treatment, it is polished, and is polished by a wire brush grinding machine. The bottom of the steel barrel and the inside of the barrel are treated twice to make the steel barrel more bright. After polishing, the defects of the steel barrel barrel are rounded up by using a shaping machine. The roundness requirement of the new barrel; after shaping, the edge port shaping machine is used for the barrel mouth shaping to prepare for the subsequent installation of the barrel cover; after that, it enters the joint processing, and the previously opened steel barrel is combined into a standard barrel; Polishing and rinsing, brushing and wiping while washing the inner wall of the steel drum with a cloth brush; rust-proof drying processing after polishing and rinsing, mainly using phosphating solution on the inner wall of the barrel Rust rinsing, and dry and dry with gas pipeline and high-frequency equipment; after the injection, the barrel and the lid are combined into one body; to ensure the quality of the steel drum, the clean steel drum will also be tested by pressure to check whether the steel drum is Leakage to ensure the quality of steel drum products. In order to prevent and control the secondary pollution problem, the production line is equipped with a closed outer cover of the negative pressure equipment, and the harmful volatile gas in the air is absorbed by the adsorption of activated carbon; the exhaust gas generated by the heating and polishing process is first cooled by the tube type, and then the pulse dust removing device is adopted. Deodorization; the spray booth uses water curtain to remove dust and deodorize. The purified gas reaches the secondary standard of GB16297-1996 "Integrated Emission Standard for Air Pollutants" and is discharged through a 15m exhaust pipe. 4, the conclusion At present, the amount of waste packaging barrels produced in China is very large, and the source is stable. It is the mainstream trend to select large-scale refurbishment of old barrels with automatic assembly line equipment. Wet cleaning is suitable for the treatment of chemical reagent drums, resin drums, solvent drums, etc. because it can be used according to the pollution characteristics of the scrap steel barrels, so it has wide applicability and high processing capacity (100,000 / a). . The main disadvantage is that the water consumption is large and the wastewater needs to be treated. Compared with the wet cleaning line, the automatic dry scrap barrel recycling production is suitable for waste steel barrels that are contaminated with waste oil, waste solvents, etc., which are suitable for hot cleaning. The retreaded packaging drum is close to the new barrel standard, and it has a large processing capacity (100,000). More than /a), good cleaning effect, no waste water discharge and other environmental protection and energy saving good results. Wahyo Violin offers a wide variety of cellos for sale, with selections for musical beginners & experts alike. Browse our instruments now. 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Research on Recycling of Waste Packaging Barrels