Method and apparatus for waste processing with multistage separation by air classification of light fractions from dried material
US6264038A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1999 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Dec 10, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
To separate light organic fractions from waste which has undergone pretreatment consisting of precomminution, ferrous-metal separation, postcomminution, further ferrous-metal separation, drying and nonferrous-metal separation, multiple, preferably so-called zigzag air classifiers are arranged in cascading stages and are passed through sequentially by the material stream to be separated. The upward-stream speed of the air is adjusted in stages in the individual air classifiers such that the first air classifier receives the smallest and the last air-classifier the highest air speed. As a result, first the fine, then the medium and lastly the large organic light fractions are discharged to the top in sequence from each air-classifier stage. The separated organic light fractions represent fuel components of high calorific value. The remaining bottom-discharge from the air classifier group consists of a mixture of heavy organic fractions and minerals. This material mixture is separated by ballistic density separation into a heavy organic fraction and minerals. The separated heavy organic fraction also represents fuel components of high calorific value. The noncombustible groups such as…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.