Variation of pH value of leaching solution during steel slag dissolution
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摘要: 为了掌握钢渣堆存时对环境造成的影响，本文研究了钢渣在溶出过程中浸出液pH值的变化规律，分析了钢渣碱度、氧化镁质量分数、水温、钢渣粒度、液固比等因素对钢渣浸出液pH值的影响规律，并与现场钢渣进行了对比试验。结果表明：钢渣溶出后浸出液pH值在10~12，随时间呈先升高后降低的趋势；提高钢渣碱度及氧化镁质量分数均使浸出液的pH值升高；水温的升高、钢渣粒度和液固比的增大可降低浸出液的pH值。Abstract: This study explored the change law changing pattern of pH value of steel slag leaching solution in the process of steel slag dissolution with an aim to study the influence of steel slag on environment.Specifically, it analyzed the influence law of steel slag basicity, magnesium oxide content, water temperature, steel slag particle size, liquid-solid ratio and other factors on pH value of steel slag leaching solution and conducted a comparative test with on-site steel slag.Results show that the pH value of the leaching solution after steel slag dissolution is in the range of 10~12, and with the change of time, the pH value first increases and then decreases.Increasing the basicity of steel slag and the content of magnesium oxide can increase the pH value of the leaching solution.The increase of water temperature, steel slag size and liquid-solid ratio can reduce the pH value of the leaching solution.
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Key words:
- steel slag /
- leach liquor /
- pH value /
- alkalinity /
- magnesium oxide content
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图 1 不同碱度钢渣对浸出液pH值的影响
Figure 1. Influence of steel slag with different alkalinity on pH value of leachate
图 2 碱度为1.0和4.0的钢渣浸出前后的XRD图谱
Figure 2. XRD patterns of steel slag with alkalinity of 1.0 and 4.0 before and after leaching
图 3 碱度为4.0的钢渣浸出前后的微观形貌
Figure 3. Microstructure of steel slag with alkalinity of 4.0 before and after leaching
图 4 不同MgO质量分数钢渣对浸出液pH值的影响
Figure 4. Influence of steel slag with different MgO content on pH value of leachate
图 5 氧化镁质量分数为2%和8%的钢渣(碱度为4.0)浸出前后XRD图谱
Figure 5. XRD patterns before and after leaching of steel slag containing 2% and 8% magnesium oxide (Alkalinity 4.0)
图 6 温度对钢渣浸出液pH值的影响
Figure 6. Temperature influence on pH value of steel slag leaching solution
图 7 钢渣粒度对浸出液pH值的影响
Figure 7. Influence of steel slag size on pH value of leaching solution
图 8 液固比对钢渣浸出液pH值的影响
Figure 8. Influence of liquid-solid ratio on pH value of steel slag leaching solution
图 9 合成钢渣与现场钢渣的对比试验结果
Figure 9. Experimental results of synthetic steel slag and on-site steel slag
表 1 现场钢渣的成分组成质量分数
Table 1. Composition mass fraction of steel slag in the field
% CaO SiO2 Fe2O3 Al2O3 P2O5 MgO 其他 48.13 13.63 25.19 1.99 2.72 3.82 4.52 
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表 2 不同碱度渣样的成分组成质量分数
Table 2. Composition of slag samples with different alkalinity
% 渣样碱度 CaO SiO2 Fe2O3 MgO Al2O3 P2O5 R1.0 30.0 30.0 27.0 6.0 2.0 5.0 R2.0 40.0 20.0 27.0 6.0 2.0 5.0 R3.0 45.0 15.0 27.0 6.0 2.0 5.0 R4.0 48.0 12.0 27.0 6.0 2.0 5.0
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表 3 不同MgO含量渣样的成分组成质量分数
Table 3. Composition of slag samples with different MgO contents
% CaO SiO2 Fe2O3 Al2O3 P2O5 MgO 51.2 12.8 27.0 2.0 5.0 2.0 49.6 12.4 27.0 2.0 5.0 4.0 48.0 12.0 27.0 2.0 5.0 6.0 46.4 11.6 27.0 2.0 5.0 8.0 44.8 11.2 27.0 2.0 5.0 10.0
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表 4 图 3中钢渣不同位置能谱分析结果
Table 4. Energy spectrum analytic results of steel slag at different positions in Fig. 3
% 元素 Ca Mg Fe Al P Si O 浸出前 点位1 43.12 3.56 14.07 0.84 8.55 2.18 23.85 点位2 44.43 4.49 17.04 0.92 8.03 2.43 19.86 浸出后 点位1 23.43 1.17 11.51 0.54 7.72 2.05 49.08 点位2 23.67 1.54 13.54 0.66 7.69 1.97 47.67
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