Investigation on Recovering Fluorite from Tailings of an Iron Ore Concentrator in Inner Mongolia
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摘要:
为高效利用内蒙古某铁矿选矿厂尾矿中的萤石资源，对其开展了详细的工艺矿物学分析和浮选试验研究。试验结果表明：在磨矿、磁选除铁后，采用硫酸为pH调整剂、水玻璃为抑制剂、L-1001为捕收剂，通过一次粗选九次精选二次扫选的闭路浮选流程，可获得CaF2品位97.12%、回收率85.73%的浮选精矿，再经强磁选可获得CaF2品位97.78%、全流程回收率78.25%的萤石精矿。
Abstract:To achieve efficient utilization of fluorite resources in the tailings of an iron concentrator in Inner Mongolia, process mineralogy and flotation tests were carried out. The results showed that following iron removal by grinding and magnetic separation, flotation concentrate with CaF2 grade of 97.12% and recovery of 85.73% was obtained by using sulfuric acid as pH regulator, sodium silicate as inhibitor, and L-1001 as collector through the closed circuit flotation comprising one roughing, nine cleaning, and two scavenging. Further, the fluorite concentrate with CaF2 grade of 97.78% and full process recovery rate of 78.25% could be obtained through high intensity magnetic separation.
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Key words:
- an iron ore /
- tailings /
- fluorite /
- flotation
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表 1 试验给矿多元素分析结果
Table 1. Multi-elements analysis results of feeding
元素 TFe CaF2 REO P S MnO K2O 含量/% 9.80 26.64 4.02 0.38 1.37 1.53 2.850 元素 Na2O CaO MgO Al2O3 TiO2 BaO SiO2 含量/% 0.955 3.74 9.15 5.52 0.49 2.22 24.77 
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表 2 试验给矿矿物组成分析
Table 2. Mineral composition analysis of feeding
矿物名称 铁矿物 萤石 方解石、
白云石稀土矿物 闪石 含量/% 10.2 29.6 18.6 5.2 2.6 矿物名称 云母 磷灰石、重晶石 辉石 石英、长石 其他 含量/% 3.5 4.3 0.7 25.6 0.7
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表 3 试验给矿中萤石解离度分析结果
Table 3. Analysis results of fluorite dissociation in feeding
粒级/μm −60 −20 −10 −8 −7 −5 −4 −3 总计 原矿石粒级产率/% 7.7 10 32.51 16.37 15.26 7.71 6.75 3.70 100.00 萤石单体解离度/% 46.7 71.0 87.00 − 89.20 93.10 98.90 97.20 95.70 萤石单体解离量/% 8.6 16.10 23.00 15.4 15.10 7.20 6.70 3.60 95.70 萤石与稀土连生量/% 1.70 1.60 2.60 − 1.60 0.20 0.02 0.04 7.40 萤石与铁矿物连生量/% 1.90 1.70 3.80 − 1.40 0.30 0.06 0.06 9.20 萤石与铁稀土连生量/% 0.50 0.60 1.10 − 0.20 − − − 2.70
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表 4 不同种类捕收剂浮选试验结果
Table 4. Results of flotation tests of different collectors
捕收剂名称 产品名称 CaF2品位/% CaF2回收率/% C180 粗精矿 42.67 48.05 中矿 29.48 33.03 尾矿 12.55 18.91 给矿 26.64 100.00 油酸 粗精矿 42.28 56.03 中矿 25.66 24.08 尾矿 14.32 19.09 给矿 26.44 100.00 L-1001 粗精矿 50.18 64.04 中矿 28.60 28.99 尾矿 4.76 6.97 给矿 26.64 100.00
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表 5 萤石浮选闭路试验结果
Table 5. Closed circuit test results of fluorite flotation
产品名称 产率/% CaF2品位/% CaF2回收率/% REO品位/% REO回收率/% 浮选精矿 23.52 97.12 85.73 1.22 30.35 浮选尾矿 76.48 4.97 14.27 4.88 59.65 给矿 100.00 26.64 100.00 4.02 100.00
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表 6 强磁选试验结果
Table 6. Test results of high intensity magnetic separation
产品名称 产率/% CaF2品位/% CaF2回收率/% REO品位/% REO回收率/% 萤石精矿 90.66 97.78 91.28 0.34 25.27 磁选尾矿 9.34 90.67 8.72 9.76 74.73 给矿 100.00 97.12 100.00 1.22 100.00
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表 7 萤石精矿主要化学元素分析结果
Table 7. Analysis results of main chemical elements of fluorite concentrate
元素 CaF2 CaCO3 S P SiO2 REO 含量/% 97.78 0.86 0.08 0.16 0.48 0.34
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