## 2 Materials and Methods
### Materials

Table 1: _Cont._chloride hexahydrate (99%), strontium chloride hexahydrate (99.5%), sodium hydrogen phosphate dihydrate (99%), sodium metasilicate nonahydrate (99%), iron citrate (99%), vitamin B1 (98%), vitamin B12 (98%), and D-Biotin (vitamin H) (>98%) from Macklin Biochemical Technology Co., Ltd. (Shanghai, China); sodium chloride (\(\geq\)99.5%), magnesium oxide (\(\geq\)98%), boric acid (\(\geq\)99.5%), and ethanol absolute (\(\geq\)99.7%) from YONGDA Chemical Reagent Co., Ltd. (Tianjin, China); molybdenum trioxide (\(\geq\)99.5%) from Guanfu Fine Chemical Research Institute (Tianjin, China); potassium chloride (\(\geq\)99.5%) from Baishi Chemical Industry Co., Ltd. (Tianjin, China); zinc sulfate hepthydrate (\(\geq\)99.5%) from Kemiou Chemical Reagent Co., Ltd. (Tianjin, China); and hydrochloric acid (36-38%) from Kaixin Chemical Co., Ltd. (Tianjin, China) were selected in this experiment. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Types of Slag** & **CaO** & **Fe2O3** & **SiO2** & **P2O5** & **MnO** & **MgO** & **Al2O3** & **Cr2O3** & **V2O5** & **TiO2** \\ \hline Converter Slag & 46.60 & 31.52 & 8.25 & 2.29 & 1.47 & 4.10 & 1.34 & 0.94 & 1.75 & 0.51 \\ EAF Slag & 27.89 & 2.09 & 34.57 & 0.01 & 5.96 & 4.81 & 3.81 & 16.95 & 0.26 & 2.59 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Chemical compositions of converter slag and EAF slag used for this study. (wt%). \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Reagents** & **Purity** & \multicolumn{4}{c}{**Manufacturer**} & **Location** \\ \hline Cupric Sulfate & & \(\geq\)99\% & & & & & & \\ Sodium Nitrate & \(\geq\)99\% & & & & & & & \\ Calcium Hydroxide & \(\geq\)95\% & & & & & & & \\ Sodium Fluoride & \(\geq\)98\% & & & & & & & \\ Potassium Bromide & \(\geq\)99\% & & & & & & & \\ Sodium Sulfate Anhydrous & \(\geq\)99\% & & & & & & & \\ Sodium Carbonate Anhydrous & \(\geq\)99.8\% & & & & & & & \\ Potassium Phosphate Dibasic & \(\geq\)99\% & & & & & & & \\ Magnesium Sulfate & \(\geq\)99\% & & & & & & & \\ Ethlyenediamine Tetraacetic Acid Disodium Salt & \(\geq\)99\% & & & & & & & \\ Sodium Hydroxide & \(\geq\)96\% & & & & & & & \\ Calcium Chloride Anhydrous & \(\geq\)96\% & & & & & & & \\ \hline Magnesium Chloride Hexahydrate & 99\% & Aladdin Biochemical Technology & & & & & & \\ Sodium bicarbonate & 99\% & & & Co., Ltd. & & & & \\ \hline Iron Chloride Hexahydrate & 99\% & & & & & & & \\ Manganese Chloride Tetrahydrate & 99\% & & & & & & & \\ Cobalt Nitrate Hexahydrate & 99\% & & & & & & & \\ Calcium Chloride Dihydrate & \(\geq\)99.9\% & & & & & & & \\ Cobalt Chloride Hexahydrate & 99\% & & & & & & & \\ Strontium Chloride Hexahydrate & 99\% & & & & & & & \\ Sodium Hydrogen Phosphate Dihydrate & 99\% & & & & & & & \\ Sodium Metasilicate Nonahydrate & 99\% & & & & & & & \\ Iron Citrate & 99\% & & & & & & & \\ Vitamin B1 & 98\% & & & & & & & \\ Vitamin B12 & 98\% & & & & & & & \\ D-Biotin (Vitamin H) & \(>\)98\% & & & & & & & \\ \hline Sodium Chloride & \(\geq\)99.5\% & & & & & & & & \\ Magnesium Oxide & \(\geq\)98\% & & & & & & & \\ Boric Acid & \(\geq\)99.5\% & & & & & & & \\ Ethanol Absolute & \(\geq\)99.7\% & & & & & & & & \\ \hline Molybdenum Trioxide & \(\geq\)99.5\% & & & & & & & & \\ Potassium Chloride & \(\geq\)99.5\% & & & & & & & & \\ \hline Zinc Sulfate Hepthydrate & \(\geq\)99.5\% & & & & & & & & \\ Hydrochloric Acid & 36–38\% & & Kaixin Chemical Co., Ltd. & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Chemical reagents used for this study.