Process for improving the fragmentation capability of metallurgical slags and cinders
AssigneeEntreprise Gagneraud Pere et Fils
InventorsMaryan Kunicki, Michel Roussel
Life of this patent
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Abstract
The process consists essentially of injecting into slags and cinders derived from the manufacture and various treatments of irons, cast irons, steels, and non-ferrous metals while they are molten and before or during cooling thereof, dry pulverulent mineral compounds capable of releasing non-polluting gases by thermal dissociation (metallic carbonates in particular). The easily fragmented slags and cinders obtained are usable in many fields such as: building and construction, ground coverings, abrasives, water filtering, fertilizers for agriculture, etc.
Claims14
A process for treating metallurgical slags and cinders to modify their physical-chemical characteristics while conserving energy consumption, and to increase their fragmentability and crushability, comprising:
- injecting into the slag, by means of compressed air directed substantially perpendicularly to the sheet of molten slag being poured in the molten state from the ladle into the cooling pit, a jet of pulverulent dry material compounds capable of releasing non-polluting gases into the slag by endothermal reaction utilizing a part of the sensible heat of the molten mass of the slag, wherein the temperature of the slag being poured is sufficiently high to permit said endothermal reaction and sufficiently low to permit capture of the gases so produced while the slag is solidifying;
- and
- fragmenting or crushing the solidified slag so produced for further use.
In a process of making non-phosphates steel in a steel mill in which the molten steel and slag produced are separated and solidified and at least a portion of the slag is fragmented step, recycled to the process for making steel, the improvement whereby the fragmentability of the solidified slag is increased, comprising:
- pouring the molten slag into a cooling area;
- and
- injecting into the slag, during said pouring step, pulverulent dry mineral compounds capable of releasing non-polluting gases into the slag by endothermal reaction utilizing a part of the sensible heat of the molten mass of the slag;
- wherein the temperature of the slag during said injecting step is sufficiently high to permit said endothermal reaction and sufficiently low to permit capture of the gases so produced while the slag is solidifying.
Dependencies are inferred from the claim text.