Experimental Study on Low-temperature Flotation of Quartz-type Fluorite with Petroleum Sodium Sulfonate
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摘要:
针对含CaF2 47.48%、SiO2 39.70%的石英型萤石矿，采用常规萤石浮选捕收剂油酸钠在低温度的矿浆环境下较难获得良好的选别指标，为了改善该萤石矿在低温下的浮选效果，采用耐低温性好的石油磺酸钠捕收剂（PSK-13）进行浮选试验研究。结果表明，以碳酸钠作调整剂、水玻璃作抑制剂、PSK-13作捕收剂，采用1次粗选6次精选，中矿顺序返回的闭路浮选流程，可在矿浆温度为5℃时获得CaF2品位98.57%、回收率为75.02%的FC-98级别的萤石精矿，为该矿在低温下的浮选提供了技术参考。吸附量测试表明，在5~30℃间，PSK-13在萤石表面的吸附量变化不大，且均大于油酸钠的吸附量，因此具有良好的低温捕收性能。
Abstract:For quartz-type fluorite ore with CaF2 content of 47.48% and SiO2 content of 39.70%, it is difficult to obtain a good selection index using a conventional fluorite flotation collector of sodium oleate in a low-temperature pulp environment. In order to improve the flotation effect of the fluorite ore at low temperature, flotation experiments were conducted using sodium petroleum sulfonate collector (PSK-13) with good low-temperature resistance. The results showed that the CaF2 grade of 98.57% and the FC-98 fluorite concentrate recovery of 75.02% could be obtained by the process of "closed flotation circuit of one roughing, six cleaning and middling returned cyclically" with the regulator of sodium carbonate, the depressant of water glass and the collector of PSK-13 when the pulp temperature is 5 ℃, which provided a technical reference for the low-temperature flotation. The results of the adsorption amount experiment showed that the adsorption amount of PSK-13 fluorite on the surface changed little and is greater than the adsorption amount of sodium oleate from 5 ℃ to 30 ℃, showing the good performance of low-temperature collection.
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Key words:
- fluorite /
- petroleum sodium sulfonate /
- low-temperature flotation
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表 1 原矿多元素分析结果
/% Table 1. Multi-element analysis results of raw ore
Composition CaF2 MgO Al2O3 SiO2 P2O5 Fe2O3 K2O Na2O TiO2 Concent 47.48 0.24 4.70 39.70 0.08 0.61 1.00 0.28 0.10 
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表 2 萤石矿粒度分析结果
Table 2. Results of particle size analysis of fluorite
Mineral size /mm Recovery /% Grade /% CaF2 distribution rate /% +0.85 11.52 44.71 10.85 -0.85+0.50 23.39 43.58 21.47 -0.50+0.15 45.39 51.09 48.84 -0.15+0.074 12.03 52.98 13.42 -0.074+0.045 2.34 42.44 2.09 -0.045 5.33 29.62 3.33 Total 100.00 47.48 100.00
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表 3 捕收剂种类对CaF2含量及回收率的影响
Table 3. Effects of collector types on CaF2 content and recovery
Collector type Products Grade/% Recovery/% Sodium oleate Rough concentrate 95.71 74.55 Tailings 18.70 25.45 Total 46.68 100.00 PSK-13 Rough concentrate 95.18 87.04 Tailings 10.51 12.96 Total 46.57 100.00
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表 4 闭路试验结果
Table 4. Results of closed circuit experiment
Temperature /℃ Products Yield /% Grade /% Recovery /% 30 Concentrate 40.73 97.85 88.08 Tailings 59.27 12.87 11.92 20 Concentrate 39.06 97.80 84.36 Tailings 60.94 15.23 15.64 10 Concentrate 36.75 98.32 79.52 Tailings 63.25 17.80 20.48 5 Concentrate 34.41 98.57 75.02 Tailings 65.59 20.68 24.98
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