Low Temperature Flotation of a Low-grade Phosphate Rock in Yichang by Modified Fatty Acids
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摘要:
为了开发利用湖北宜昌某矿区的低镁高倍半氧化物中低品位胶磷矿资源，采用棉油脂肪酸皂为原料，复配聚氧乙烯醚非离子型表面活性剂，制备了阴离子捕收剂MON−135，并进行了低温正反浮选实验研究。实验结果表明，当矿浆温度为14 ℃、磨矿细度为−0.074 mm含量为93.7%时，首先在碱性条件下采用捕收剂MON−135进行正浮选，浮选精矿在酸性条件下采用捕收剂LAA−T反浮选碳酸盐脉石矿物，最终获得磷精矿P2O5品位为32.61%、回收率92.67%的选矿指标。研究结果表明，采用改性脂肪酸MON−135能在较低的温度下有效浮选胶磷矿，且效果较好。
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关键词:
- 低品位胶磷矿 /
- 低温浮选 /
- 正反浮选 /
- 捕收剂MON−135
Abstract:In order to develop the low−grade colloidal phosphate ore resources with low magnesium and high sesquioxide in a mine in Yichang of Hubei Province, cotton oil fatty acid soap was used as raw material and compounded with polyoxyethylene ether nonionic surfactant to obtain a good selective anionic collector MON−135, which was used to conduct a pilot study of low temperature direct and reverse flotation. The experimental results showed that at a flotation pulp temperature of 14 ℃ and a grinding fineness of −0.074 mm 93.7%, a process was adopted involving direct flotation with one roughing and one cleaning and one scavenging followed by one roughing and one scavenging in reverse flotation, the dosages of sodium carbonate, water glass and MON−135 for direct flotation roughing were 7.0 kg/t, 3.0 kg/t and 1.4 kg/t, respectively; the dosage of MON−135 for positive flotation sweeping was 0.5 kg/t; the dosages of sulfuric acid and collector LAA−T for reverse flotation roughing were 9.0 kg/t and 0.9 kg/t, respectively; and the dosage of sulfuric acid for sweeping was 2.5 kg/t. the phosphate concentrate P2O5 grade of 32.61% and recovery of 92.67% were obtained in the closed circuit test. The results show that the use of low temperature collector can effectively flotation collophane ore at a lower flotation temperature, and can obtain a better beneficiation index.
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Key words:
- low−grade collophane ore /
- low−temperature direct /
- reverse flotation /
- collector
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表 1 样品多元素分析结果
Table 1. Results of multi−element analysis of samples
/% 成分 P2O5 MgO SiO2 Fe2O3 Al2O3 CaO 含量 25.74 1.4 20 2.21 4.65 35.50 
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表 2 碘值135棉油脂肪酸主要组分
Table 2. Main components of fatty acids in cotton oil with iodine value 135
脂肪酸组成 软脂肪酸 硬脂肪酸 油酸 亚油酸 亚麻酸 其他脂肪酸 含量/% 8.45 3.55 27.92 57.32 2.61 0.87
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表 3 闭路实验结果
Table 3. Results of closed−circuit tests
/% 产品名称 产率 P2O5品位 P2O5回收率 反浮选精矿 72.08 32.61 92.67 反浮选尾矿 2.45 2.38 0.23 正浮选尾矿 25.47 7.06 7.10 原矿 100.00 25.36 100.00
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