Patent · US Expired

Process of dressing contaminated soils

US4969775A · kind A · utility

17Cited by

8References

19Claims

0Family size

Assignee

Metallgesellschaft AG · DE

Inventors

Fred Cappel
Dirk Hankel · Mühlheim, DE
Heinrich Meiler · Hofheim, DE
Friedrich Rosenstock · Frankfurt am Main, DE

Key dates

Filing date	Oct 20, 1988
Grant date	Nov 13, 1990
Priority date	—
Expiry date	Oct 20, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/908
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

For a separation into a purified fraction and a polluant concentrate, contaminated soils are ground in a drum to which loose pieces acting like grinding elements have been added and with a net energy input of 4 to 16 kWh per 1000 kg throughput. The speed is 50 to 90% of the critical speed ##EQU1## The suspension discharged from the drum is separated by sieving into a relatively coarse fraction and a relatively fine fraction. The relatively coarse fraction is discharged as a purified fraction and the relatively fine fraction is desludged. The separated sludge is dewatered and is subsequently delivered as a polluant concentrate. The desludged remainder of the finer fraction is dewatered and is subsequently delivered as purified soil.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.