Production of bricks
US3994741A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1975 |
| Grant date | Nov 30, 1976 |
| Priority date | — |
| Expiry date | Mar 26, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B33/13
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Production of building bricks utilizing as an ingredient thereof, advantageously in substantial or in major proportion of brick-forming compositions or mixtures of ingredients, ore residues obtained from the extraction of lithium values from beta-spodumene. The said residues so utilized result from a process in which beta-spodumene is subjected to a sulfuric acid roast, the lithium values are then extracted from the acid-roast product by an aqueous extraction liquid, followed by neutralization with lime or limestone, and separation of the formed lithium sulfate by filtration, leaving the ore residues which are then utilized in admixture with other ingredients to produce bricks possessing excellent strength and other desirable properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.