apparatus for treatment of oily sludge
US5006239A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1990 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Apr 23, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K3/32
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A novel apparatus removes hydrophobic oil from solid particulates in oily sludge waste such as waste material from oil refineries, drilling fluids or muds brines, and other chemical wastes which have solid particulates contaminated with oil. The process involves separation of different components of the sludge on the basis of their size, density and physio-chemical differences. Coarse particulates are removed with the use of screening systems such as sieve bends or vibro-sieves. Oil is removed from these coarse particulates with water rinsing. Oil is removed from fine particles by gravity separation, which separates the sludge into high and low density fractions. Froth flotation is used to remove hydrophilic materials from the high density fraction. Froth flotation may involve the use of frothing agents, surface modifying agents and surfactants, the selection of which generally depends on the composition of the sludge, the physical and chemical characteristics of the sludge, and the desired separation composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.