Experimental Study on Flotation of Apatite Ore with Modified Waste Engine Oil at Room Temperature
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摘要:
为减轻废机油对环境的污染，以废机油为基础，经氧化改性制得新型捕收剂，并考察了其在低品位磷灰石矿浮选中的应用情况。以重铬酸钾为氧化剂，在通气量为0.15 m3/h、氧化时间为24 h、氧化温度为110 ℃、重铬酸钾用量为废机油质量的0.2%时，获得最佳的氧化效果。红外光谱和气质联用分析结果表明，经氧化改性后，废机油中的C=C双键部分被氧化为羟基和羧基等官能团，属于脂肪酸类捕收剂。实际矿石分选结果表明，针对P2O5品位为1.72%的某磷灰石矿，在矿浆温度为15 ℃的条件下，当水玻璃用量2000 g/t、改性废机油捕收剂用量400 g/t时取得较好的分选效果，经一次粗选可获得精矿P2O5品位为26.01%、精矿回收率为95.12%的磷灰石精矿，并且在15～40 ℃温度范围内，浮选效果基本一致。经氧化改性的废机油可作为磷灰石潜在的浮选捕收剂。
Abstract:In order to reduce the environmental pollution caused by waste engine oil, a novel collector was prepared based on waste engine oil by oxidation modification, and its application in flotation of low-grade apatite ore was investigated. The best oxidation effect was obtained at the aeration rate of 0.15 m3/h, the oxidation time of 24 h, the oxidation temperature of 110 ℃, and the potassium dichromate of 0.2%. The analysis results of IR and GC−MS showed that the C=C double bond in the waste engine oil was oxidized into hydroxyl and carboxyl groups after oxidation modification, which belonged to fatty acid collectors. The results showed that a good separation effect was obtained for the actual ore at the sodium silicate of 2000 g/t, the modified waste engine oil collector of 400 g/t, and the pulp temperature of 15 ℃. Apatite concentrates with P2O5 grade of 26.01% and recovery of 95.12% was obtained by one−step roughing, and the flotation effect was basically the same in the temperature range of 15−40 ℃. Oxidation modified waste engine oil would be used as a potential flotation collector for apatite.
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Key words:
- waste engine oil /
- oxidation modification /
- collector /
- apatite /
- flotation
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表 1 磷灰石纯矿物化学多元素分析
Table 1. Chemical multielement analysis of apatite pure mineral
成分 P2O5 SiO2 Fe2O3 Al2O3 CaO MgO Na2O F 含量/% 38.41 1.08 0.04 0.23 54.31 0.13 3.25 2.55 
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表 2 磷灰石实际矿样化学多元素分析
Table 2. Chemical multielement analysis of apatite actual mineral
成分 P2O5 SiO2 Fe2O3 Al2O3 CaO MgO Na2O K2O SO3 含量/% 1.72 47.47 7.68 14.03 7.19 4.76 3.25 2.08 0.26
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