Treatment of tailings pond sludge
US4399039A · kind A · utility
39Cited by
8References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 8, 1982 |
| Grant date | Aug 16, 1983 |
| Priority date | — |
| Expiry date | Jan 8, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/901
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A tailings pond sludge layer of high density and strength is obtained by treating the sludge with an additive selected from a specific family of hydrolized starch additives which impart improved permeability and shear strength characteristics to the sludge. Thereafter, the sludge is mixed with sand which adds self-weight whereby further dewatering of the sludge sand mixture is accomplished. Unlike untreated sludges or sludges treated with other known additives or flocculants, sludge treated with the aforementioned hydrolyzed starch additives is able to support the sand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.