原矿 精矿 反扫中矿 反浮尾矿
正浮一粗二精一扫 反浮一粗一扫
正精2中矿 正精1中矿 正扫中矿 正浮尾矿 原矿
100.00 21.33 1.87 9.51 11.91 19.47 10.84 25.07 100.00
15.86 33.67 24.97 1.44 13.65 13.88 16.85 7.32 15.78
100.00 45.53 2.96 0.87 10.31 17.13 11.58 11.62 100.00
24.20
试验结果表明，采用正浮一粗一精一扫反浮一粗开路试验最终磷精矿品位只有28.86%，精矿中MgO的含量为1.6%，SiO2的含量为11.88%；反浮选尾矿品位高达9.34 %，正浮选尾矿品位8.78%，精矿品位不高，正反浮的尾矿品位都较高。为了提高精矿品位，降低尾矿品位，在原来的基础进行了调整，在正浮选上再加一次精选，且两次精选不添加任何药剂；反浮选粗选pH控制在5.8，ST-4抑制剂提高到0.9kg/t，OYJ-68增加到1.5kg/t；反浮选加一次扫选，其pH控制在4.3左右，降低反浮选尾矿磷的品位，原矿经正浮一粗两精一扫反浮一粗一扫的开路浮选后，获得精矿指标P2O5品位33.67%,反浮尾矿P2O5品位1.44%，正浮尾矿P2O5品位7.32%，开路试验的回收率达到45.53%。 2.4闭路流程试验
闭路试验是用来考查循环物料影响的分批试验，是在不连续设备上模仿连续的生产过程。为了降低中矿的累积，减少细泥团聚的现象，闭路试验时将正浮选粗选的矿浆浓度33%（质量分数）左右降到24%，同时提高浮选的温度至25℃。试验流程见图4，闭路数质量流程见图5。
原矿1’1’2’碳酸钠8.0kg/t水玻璃5.0kg/tMXO-135 1.8kg/t 正粗T=20℃2’正扫MXO-135 0.6kg/t 正精1正精21’1’1’硫酸15.0kg/t中矿2柠檬酸0.9kg/t OJY-68 1.5kg/t中矿1反粗1’1’反扫精矿硫酸6.0kg/t OJY-680.3kg/t中矿3正浮尾矿
图例：产率图6闭路试验流程图 Fig.6 The flow chart of closed-circuit flotation 原矿品位回收率（%）
18.97反浮尾矿32.42100.0017.2815.62100.00165.5914.71106.17117.4816.57155.8959.4210.10132.6118.7687.34正粗140.6538.41104.92正精145.2712.3335.73正扫15.5020.3220.16中矿139.107.2918.25正精2中矿360.9020.9781.7521.8674.35104.0726.44中矿213.6923.17正浮尾矿12.5326.00反粗29.0978.07反扫25.9213.4522.32中矿43.033.6841.93精矿图7闭路试验数质量流程图
Fig.7 Quantity-quality flowsheet of closed-circuit test
原矿P2O5品位15.62%经过正浮选一粗两精一扫，反浮选一粗一扫中矿顺序返回闭路流程试验，获得的磷精矿P2O5品位29.09%、回收率78.07%，精矿中MgO的品位0.82%.反浮选尾矿P2O5品位3.02%，正浮选尾矿P2O5品位7.29%。
3 结 论
（1）宜昌磷矿重介质分选产生的微细级低品位胶磷矿需采用低浓度浮选，同时采用较强选择性的捕收剂有助于提高精矿的品位，利用小分子有机酸ST-4能有效抑制剂细粒级磷矿物，提高分选效果。
（2）原矿P2O5品位15.62%正浮选一粗两精一扫，反浮选一粗一扫中矿顺序返回闭路流程试验，在矿浆浓度为24%，浮选温度25℃，药剂制度 Na2CO3 8.0kg/t、Na2SiO 5.0kg/t、 MXO-135 1.8kg/t、正浮扫选MXO-135 0.6kg/t 、两次精选不加药；反浮粗选硫酸15kg/t、柠檬酸0.9kg/t、反浮粗选OYJ-68 1.5kg/t、反浮扫选硫酸6.0kg/t、反浮扫选OYT-68 0.3kg/t的条件下，获得的磷精矿P2O5品位29.09%、回收率78.07%，精矿MgO品位0.82%，反浮选尾矿P2O5品位3.02%，正浮选尾矿7.29%，选矿
效率36.14%。
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Recovery of Fine-grain and Low-grade Collophane from Gravity Tailings of Yichang Phosphate by
Flotation
Luo Huihua1,Liu Liankun1, Zhu Daopeng1, Qu Dingjun2, Miao Huajun2, Hu Xuechao2, Hu Zheng2, Zhang
Zhanli2
(1.School of Resource and Civil Engineering, Wuhan Institute of Technology, Wuhan, Hubei,china; 2.Hubei Shashuya Mining Technology Development Co.,Ltd., yichang, Hubei,china）
Abstract: Directed at the low-grade fine grain collophane produced by the heavy medium separation of Yichang phosphate rock, the multi-element analysis and and particle size analysis were carried out. The analysis show that the fine particle under 0.045mm fraction content is above 94%, the grade of P2O5 is nearly 15.62 %, MgO content of 4.30 %, SiO2 content of 24.46%, which belongs to the micro fine silicon low grade cellophane. The test results show that the final dressing index with P2O5 grade of 29.09%, recovery of 78.01%, MgO content of 0.82% has gained by flow of one roughing one scavenging two cleaning direct flotation joint one roughing one scavenging reverse flotation. It can effectively recover the low-grade fine grain collophane produced by the heavy medium separation of Yichang phosphate rock and improve the utilization of resources.
Keywords: Fine-grain collophane; Low concentration direct-reverse flotation; Dense medium separation
