Effects of Iron on the Acid Leaching for Clinker of the Vanadium Slag by Calcium Roasting
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摘要: 针对含钒钙化熟料酸浸过程中因金属铁还原而出现浸出液变黑、钒转浸率下降等问题,进行了含钒钙化熟料中金属铁含量、酸浸pH值、酸浸时间等工艺参数对酸浸效果影响的试验研究。结果表明,当酸浸pH≈2.8和酸浸时间~60 min时,钙化熟料金属铁含量应控制在2%以内,钒转浸率为86%;当钙化熟料金属铁含量大于2%时,应控制酸浸pH≈3.0,酸浸时间~45 min,存放时间 ≤ 120 min,此时能有效降低金属铁对钒转浸率的影响程度,钒转浸率可控制在80%以上。Abstract: Effects of the factors including iron content of clinker,pH and time on the acid leaching for the clinker of vanadium slag by calcium roasting were researched to resolve the problems of blackening for the leaching solution and decreasing of the leaching rate caused by the iron in the clinker.The results show that the leaching rate of vanadium is 86% with the pH ≈2.8,time=60 min during the leaching process and iron content ≤ 2% in the clinker,and the blackening of the leaching solution can be avoided;The influences of iron on the leaching process can be reduced with the leaching rate>80% when iron content>2% in the clinker,pH ≈3.0 and time=45 min during the leaching process and the storage time ≤ 120 min for the leaching solution.
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Key words:
- vanadium /
- calcification clinker /
- iron /
- acid leaching /
- leaching rate
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