The Application of X-ray Sorting-Reverse Flotation in Phosphate Rock Beneficiation of Yichang Phosphor Layer Ore
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摘要:
宜昌中磷层磷矿平均P2O5品位仅为22%左右，难以直接工业利用。中磷层磷矿有价磷矿物为磷灰石和胶磷矿，其嵌布粒度较细、在0.03~0.5 mm之间，磷灰石和胶磷矿多呈富磷矿物集合体形式存在，富磷矿物集合体嵌布粒度较粗，能够作为选别对象。中磷层磷矿经过筛分处理，-10 mm粒级磷精矿P2O5品位约为26%，可直接给入浮选作业处理。而-30+10 mm粒级产品采用X射线拣选技术，可获得P2O5品位26%以上、作业回收率80%~86%的磷精矿。筛分作业-10 mm粒级磷精矿与X射线拣选得到的磷精矿合并送往反浮选作业，最终可获得P2O5品位32%以上的优质磷精矿。试验结果表明，X射线拣选—浮选联合工艺表现出优良的分选效果，在处理其它类似低品位、嵌布粒度细的磷矿资源时，该联合工艺有巨大的推广潜力。
Abstract:The P2O5 grade of Yichang middle phosphate rock is only about 22% on average, it is difficult to direct industrial use. Apatite and collophane are the main valuable P-containing minerals in Yichang ore. They have fine dissemination size of 0.03-0.5 mm. But they exists in the form of coarse-grained aggregate of P-containing minerals which can be used as separation objects. After ore of Yichang middle phosphate rock layer was screen, P2O5 grade in -10 mm class is about 26% which can be directly as feed of flotation. While the -30+10 mm class was treated using X-ray sorting technology, after that, phosphorus concentrate was obtained with P2O5 grade of more than 26% and recovery of 80%-86%. The -10 mm class products and X-ray sorting concentrate together feed into reverse flotation. Flotation concentrate with P2O5 grade of more than 32% was obtained eventually. The test results show that the X-ray sorting-reverse flotation process will show a good separation effect, in dealing with other similar low grade phosphate rock1 resources, and the combined process has great potential of popularization.
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Key words:
- Yichang middle phosphate layer /
- screening /
- X-ray sorting /
- preconcentration /
- reverse flotation
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表 1 中低品位(P2O5 22%左右)原矿筛分结果
Table 1. Size distribution of medium- and low-grade (P2O5 22%) raw ore
/% -10 mm粒级 +10 mm粒级 产率 回收率 品位(P2O5) 产率 回收率 品位(P2O5) 24.65 29.76 26.89 75.35 70.24 20.43 
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表 2 X射线分选试验结果
Table 2. Results of X-ray sorting of +10-30 class ore
/% 原矿 精矿指标 尾矿指标 品位 产率 品位 回收率 产率 品位 回收率 19.17 54.88 28.27 80.94 45.12 8.10 19.06 19.95 58.18 27.85 81.22 41.82 8.96 18.78 20.32 63.48 27.66 86.41 36.52 7.56 13.59
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表 3 反浮选技术指标
Table 3. Technical index of reverse flotation
/% 原矿 精矿 尾矿 P2O5品位 P2O5品位 产率 回收率 P2O5品位 产率 回收率 27.25 32.15 80.27 94.7 7.32 19.73 5.3
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