Extraction of the RO Phase from Steel Slag

Abstract:

Through the XRD and XRF analysis of the converter steel slag, we can identify the chemical components and the mineral phase and ensure the extraction method of RO phase from steel slag. The possibility of the extraction of silicate phase from steel slag with Salicylic acid ethanol (SAE) solution was studied firstly. Then, the effect of dissolution temperature of steel slag, dissolution time of the samples, concentration of salicylic acid and specific surface area of steel slag on the extraction mass of silicate phase were analyzed by orthogonal experiment, and the optimum experiment conditions of the extraction of silicate phase from steel slag with SAE solution were concluded. Finally, the RO phase was obtained by the extraction and separation of the intermediate phase from steel slag using potassium hydroxide-sucrose (KOSH) solution. The effect of extraction was determined by detecting the chemical and mineral composition of the extracted residue with XRD and XRF. The results show that the SAE solution can be used to extract the silicate phase from steel slag and the best extraction conditions were 40 degrees of dissolution temperature, 3 h of solution time, salicylic acid concentration 0.2 g/ml and the specific surface area of steel slag 600 m²/kg. Then the intermediate phases (mainly C₂F) from steel slag were extracted by KOSH solution, which can get a relatively pure RO phase. The experiment provides a basis for further exploring the cause of the difference in activity of RO phase and improving the utilization ratio of steel slag.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 2470-2475
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.2470
• Online since: June 2017
• Authors: Su Ping Cui*, Xue Li Wang, Jian Feng Wang, Hui Liu
• Keywords: Extraction, RO Phase, Silicate Phase, Steel Slag

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