Method for cyclically preparing elemental boron and coproducing sodium cryolite using sodium fluoborate as intermediate material
US8557209B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2012 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | Dec 9, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25C3/18
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for cyclically preparing elemental boron and coproducing sodium cryolite using sodium fluoborate as an intermediate material, which includes the following steps: A) adding hydrofluoric acid to boric acid or boron oxide to enable a reaction to form fluoboric acid; B) adding a sodium carbonate aqueous solution to the fluoboric acid to enable a reaction to form the sodium fluoborate; C) putting the sodium fluoborate into a reactor, adding aluminum to react with the sodium fluoborate to form the elemental boron and sodium cryolite; D) extracting the sodium cryolite, sending the sodium cryolite to a rotary reaction kettle together with concentrated sulphuric acid to enable a reaction to form hydrogen fluoride gas and aluminum sodium sulphate, collecting the hydrogen fluoride gas and dissolving it into water to obtain the hydrofluoric acid; E) recycling the obtained hydrofluoric acid to Step A to leach the boric acid or boron oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.