Method for the treatment of phosphuretted slag
US4541863A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1984 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | May 29, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for the treatment of phosphuretted slag obtained by refining a molten bath, such as steel. The process according to the invention involves hot oxidizing the slag into which is blended, after refining, a pulverized solid adjuvant, strongly oxidizing and easily fusible upon contact with the slag. Among utilizable adjuvants, the carbonates of alkaline metals or alkaline earth metals are preferred, in particular sodium carbonate, which additionally, is a product currently utilized in the domain of the elaboration of metal, notably in iron metallurgy. The invention ensures a rapid passivation of the slag in stabilizing the phosphorus by forming phosphate and allowing in this manner the avoidance of the liberation of very toxic phosphenes which are produced naturally by cold hydrolysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.