Soda ash production
US4341744A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1979 |
| Grant date | Jul 27, 1982 |
| Priority date | — |
| Expiry date | Nov 16, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B1/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Soda ash is produced from crude trona ore in a novel process which comprises PA0 (a) reducing the ore particle size to a maximum of about 4.0 millimeters in diameter, PA0 (b) removing fines from the ore to produce a minimum particle size of about 0.1 millimeter in diameter, PA0 (c) differentially electrifying the ore particles according to differences in conductance, PA0 (d) segregating the ore particles by electrostatic separation into at least two fractions according to the differences in electrical charge resulting from the electrification of step (c), and PA0 (e) calcining the fraction of least conductance to convert the trona contained therein to soda ash, steps (a) through (d) occurring at a temperature not to exceed about 100.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.