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A platform for research: civil engineering, architecture and urbanism
METHOD FOR RECYCLING WASTE WATER FROM A STAINLESS STEEL SLAG TREATMENT PROCESS
The present invention relates to a method for recycling waste water from a stainless steel slag treatment process wherein stainless steel slag is brought into contact with water, in particular to neutralize the free lime contained therein, thereby producing said waste water. This waste water contains heavy metals, including at least chromium, and has a pH higher than or equal to 11. In accordance with the invention, it is used as production water for manufacturing mortar and/or concrete. In this way, the heavy metals, which are dissolved in the waste water and thus readily available, become bound in the newly formed cement phases so that they are prevented from leaching. Moreover, it has been found that the workability of the fresh mortar or concrete and also the quality of the final mortar or concrete materials is not negatively affected by the use of this alkaline waste water and that an accelerated setting could be achieved during the first hours.
METHOD FOR RECYCLING WASTE WATER FROM A STAINLESS STEEL SLAG TREATMENT PROCESS
The present invention relates to a method for recycling waste water from a stainless steel slag treatment process wherein stainless steel slag is brought into contact with water, in particular to neutralize the free lime contained therein, thereby producing said waste water. This waste water contains heavy metals, including at least chromium, and has a pH higher than or equal to 11. In accordance with the invention, it is used as production water for manufacturing mortar and/or concrete. In this way, the heavy metals, which are dissolved in the waste water and thus readily available, become bound in the newly formed cement phases so that they are prevented from leaching. Moreover, it has been found that the workability of the fresh mortar or concrete and also the quality of the final mortar or concrete materials is not negatively affected by the use of this alkaline waste water and that an accelerated setting could be achieved during the first hours.
METHOD FOR RECYCLING WASTE WATER FROM A STAINLESS STEEL SLAG TREATMENT PROCESS
RECYCLING-VERFAHREN FÜR ABWASSER AUS EINEM VERFAHREN ZUR BEHANDLUNG VON EDELSTAHLSCHLACKE
PROCÉDÉ POUR LE RECYCLAGE DES EAUX USÉES PROVENANT D'UN PROCÉDÉ DE TRAITEMENT DE LAITIER D'ACIER INOXYDABLE
VAN MECHELEN DIRK (author) / LECOMTE ISABELLE (author) / NGUYEN EVELYNE (author)
2019-03-27
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
METHOD FOR RECYCLING WASTE WATER FROM A STAINLESS STEEL SLAG TREATMENT PROCESS
| European Patent Office | 2019
Method for recycling waste water from a stainless steel slag treatment process
| European Patent Office | 2017
Steel slag treatment process for preparing cement blending agent by using waste steel slag
| European Patent Office | 2016