Method for cyclically preparing monomer boron and coproducing potassium cryolite using potassium fluoborate as intermediate material
US8562931B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2012 |
| Grant date | Oct 22, 2013 |
| Priority date | — |
| Expiry date | Dec 8, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/54
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for cyclically preparing monomer boron and coproducing potassium cryolite using potassium fluoborate as an intermediate material, which includes following steps: A) adding hydrofluoric acid to boric acid or boron oxide to enable a reaction to form fluoboric acid; B) adding a potassium sulphate aqueous solution to the fluoboric acid to enable a reaction to form the potassium fluoborate; C) putting the potassium fluoborate into a reactor, adding aluminium to react with the potassium fluoborate to form the monomer boron and potassium cryolite; D) extracting the potassium cryolite, sending the potassium cryolite to a rotary reaction kettle together with concentrated sulphuric acid to enable a reaction to form hydrogen fluoride gas and aluminium potassium sulphate, potassium 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.