Method for the treatment of phosphuretted slag

Details Method for the treatment of phosphuretted slag Method for the treatment of phosphuretted slag

1984-05-29

1985-09-17

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

423155, C21B 304

Patent

active

045418632

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.

REFERENCES:
patent: 4062672 (1977-12-01), Kunicki et al.
patent: 4084959 (1978-04-01), Yamamoto et al.
patent: 4185997 (1980-01-01), Inoue et al.

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