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1 实验部分
1.1 原料
Table 1 Basic physical and chemical properties of electrolytic manganese residue
新鲜电解锰渣含水率/% | 风干电解锰渣含水率/% | 密度/(kg∙m−3) | pH | 有机质/% | 比表面积/(m2∙kg−1) | ||
32.37 | 4.29 | 2129 | 7.88 | 7.8 | 911.9 |
1.2 重金属总量测定方法
Table 2 Comparison of the contents of main metals in electrolytic manganese residue with the standard values mg∙kg−1
数值类型 | Cd | Co | Cr | Cu | Ni | Pb | Zn | Mn |
实测值 | 0.74±0.05 | 96.99±0.35 | 30.95±2.13 | 42.08±2.10 | 187.15±4.53 | 47.10±3.21 | 79.03±4.25 | 39 949±120 |
标准值 | 0.25~1.0 | 40 | 120~350 | 50~100 | 60~100 | 50~80 | 150~300 | 30 000 |
1.3 水浴振荡实验
1.4 超声辅助水浴振荡实验
Table 3 Grouping design of different experimental conditions
时间/h | pH | APG浓度/(g∙L−1) | 摇床转速/ (r∙min−1) | 超声时间/min | 超声功率/W |
6 | 2 | 20 | 80 | 10 | 200 |
12 | 3 | 40 | 120 | 20 | 250 |
18 | 4 | 60 | 150 | 30 | 300 |
24 | 5 | 80 | 180 | 40 | 350 |
32 | 6 | 100 | 210 | 50 | 400 |
42 | 7 | 120 | 240 | 60 | 450 |
1.5 金属离子赋存形态分析实验
Fig. 1 Experimental flow chart of metal ions removal from electrolytic manganese residues by APG
Fig. 1 Experimental flow chart of metal ions removal from electrolytic manganese residues by APG
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2 结果与讨论
2.1 水浴振荡对电解锰渣中金属离子的去除效果
Fig. 2 Effects of leaching time and pH on removal rate of metals in electrolytic manganese residue
Fig. 2 Effects of leaching time and pH on removal rate of metals in electrolytic manganese residue
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Fig. 3 Effects of APG concentration and rotating speed on removal rate of metals in electrolytic manganese residue
Fig. 3 Effects of APG concentration and rotating speed on removal rate of metals in electrolytic manganese residue
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2.2 超声辅助水浴振荡对电解锰渣中金属离子的去除效果
Fig. 4 Effects of ultrasound time and power on removal rate of metals in electrolytic manganese residue
Fig. 4 Effects of ultrasound time and power on removal rate of metals in electrolytic manganese residue
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2.3 洗脱前后电解锰渣中金属离子赋存形态的变化
Fig. 5 Change of chemical metal species in electrolytic manganese residue before and after the treatment with APG
Fig. 5 Change of chemical metal species in electrolytic manganese residue before and after the treatment with APG
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2.4 洗脱后电解锰渣中金属离子总量的变化
Table 4 Contents of Mn, Cd, Co and Ni in the electrolytic manganese residue after elution mg∙kg−1
Mn | Cd | Co | Ni |
12 636±58 | 0.22±0.04 | 38.26±0.21 | 72.52±1.52 |