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Method for extracting plastics from house refuse

A domestic waste and plastic technology, applied in the field of domestic waste recycling, can solve the problems of flotation mud and sewage generation, low plastic purity, and low extraction efficiency, and achieve small footprint, concentrated recyclable materials, and high extraction rate high effect

Active Publication Date: 2008-09-10
SHANGHAI BOSHIGAO ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple and the purity of the plastics obtained is high, it can only extract larger pieces and dispersed plastics in domestic waste, and the extraction efficiency is low; (2) Extract plastics by flotation method
This method uses water as a flotation agent, and uses the characteristics of plastics to be small in density and easy to float on the water to extract plastics. Although the extraction rate of plastics is high, due to the paper, chemical fibers, wood blocks, Composting organic matter is also easy to float on the water surface, so this method not only results in low purity of plastics, but also leads to a large amount of flotation mud and sewage, which is easy to cause secondary pollution

Method used

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  • Method for extracting plastics from house refuse
  • Method for extracting plastics from house refuse
  • Method for extracting plastics from house refuse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Taking domestic waste from a landfill in Shanghai as an example, the weight percentage of domestic waste is shown in Table 1

[0022] Table 1 Analysis of waste components in a domestic waste landfill in Shanghai (wet basis, 100%)

[0023] Kitchen waste

[0024] The 200kg of domestic garbage is first broken into bags, and 7.14kg of glass and 0.21kg of metal are manually picked up on the conveyor belt. The rest of domestic waste enters the combined domestic waste trommel screen, which is composed of two apertures of 40mm and 80mm. It operates under the conditions of v / v of 0.54 and drum angle of 6.0°. After screening, 91.25k8 of domestic waste Concentrate into the outlet of 80mm, and the content of plastic accounted for 27.74kg. The discharge was directly sorted by wind, and the operating conditions were consistent with the above. 23.41kg of light plastic with a purity of 81.6%. Then manually select the material in the heavy material tank of the horizontal a...

Embodiment 2

[0026] Taking domestic waste in a city in Jiangsu as an example, the components of domestic waste are shown in Table 2

[0027] Table 2 Domestic waste components in a city in Jiangsu (wet basis, 100%)

[0028] Kitchen waste

[0029]Take 200kg of the domestic waste for sorting, first break the bag, and manually remove 0.92kg of metal and 3.47kg of glass on the conveyor belt. The remaining domestic waste enters the combined trommel screen, which operates under the condition of v / v of 0.45 and angle of 5.3°. After being sieved by the combined drum sieve, 137.31kg of domestic waste is collected into the outlet of 80mm, and the amount of plastic is 4.70kg. The material > 80mm is directly air-selected under the operating conditions of wind speed 8.8m / s and fan angle 17° to obtain plastics with a purity of more than 86.3%, and a total of 4.29kg of plastics are separated. After the 40mm~80mm material is bio-composted, it is re-screened through a baffle-type drum screen wi...

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Abstract

The present invention relates to a method for extracting plastics from domestic refuse. Said method includes the following steps: breaking domestic refuse bag, conveying, manually-recovering glass and waste metal articles, using drum sieve to make classification, utilizing small granules whose grain size is less than 40 mm to make composting treatment or embedment treatment, then sorting large granules whose grain size is greater then 80 mm by using air-flow separator so as to obtain the plastics.

Description

technical field [0001] The invention discloses a method for extracting plastics from domestic waste, which involves a process of separating the plastic in the domestic waste from the domestic waste. The utility model belongs to the technical field of domestic waste recycling. Background technique [0002] With the continuous increase of plastic production and consumption, the problem that arises is that the amount of waste plastic is also increasing, and these waste plastics generally become part of domestic waste. According to statistics, about 1 million tons of waste plastics are produced in my country every year, and the amount of waste plastics accounts for about 70% of plastic production. The amount of discarded plastics is so large, but at present, the annual plastic recycling rate in my country is very small, almost less than 20% of the total amount of plastics. [0003] At the same time, among the components of urban domestic waste in our country, waste plastics ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/02B09B3/00C05F9/04B07B9/00
CPCY02A40/20Y02W30/52Y02W30/62
Inventor 赵由才李兵邹庐泉徐卫表郝广才牛冬杰柴晓利施庆燕
Owner SHANGHAI BOSHIGAO ENVIRONMENTAL TECH CO LTD