Effect of Flotation Purification on Preparation of β—Hemihydrate Gypsum from Phosphogypsum
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摘要:
磷石膏是磷化工行业产生的大宗工业固废，其中的杂质会降低磷石膏制备β−半水石膏的性能。采用浮选法对磷石膏进行净化提纯，并对比净化前后磷石膏所制备β−半水石膏的性能。研究结果表明：采用甲基异丁基甲醇为起泡剂反浮选可脱除微细矿泥及有机杂质，采用十二胺可浮出二水石膏。闭路浮选精矿与磷石膏原矿相比，白度从19.4%提升到41.1%，纯度从73.12%提升到96.41%。利用磷石膏精矿制备β−半水石膏的2 h抗折强度、2 h抗压强度、3 d干抗压强度和原样制备的相比分别提升22.8%、14.1%、24.1%，白度从27.8%提升到46.3%。采用浮选净化能显著提高磷石膏制备β−半水石膏的性能。
Abstract:Phosphogypsum produced by phosphorus chemical industry is the bulk industrial solid waste. The impurities would reduce the performance of β−hemihydrate gypsum that was prepared from phosphogypsum. In this study, phosphogypsum was purified by flotation method, and the performance of β−hemihydrate gypsum prepared from phosphogypsum before and after purification was compared. The results showed that the fine slime and organic impurities were removed by reverse flotation with methyl isobutyl methanol as foaming agent, and the dihydrate gypsum was floated by dodecamine. Compared with phosphogypsum ore, the whiteness and purity of the concentrate increased from 19.4% to 41.1% and 73.12% to 96.41%, respectively. The 2−hour flexural strength, compressive strength and 3−day dry compressive strength of β−gypsum that was prepared from phosphogypsum concentrate were 22.8%, 14.1% and 24.1% higher than those was prepared from raw ore, respectively. Whiteness increased from 27.8% to 46.3%. Flotation purification can significantly improve the performance of phosphogypsum in β−gypsum preparation.
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Key words:
- phosphogypsum /
- flotation /
- purification /
- β gypsum /
- strength
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表 1 磷石膏原料化学成分XRF分析结果
Table 1. XRF analysis results of phosphogypsum raw ores
/% 元素 SO3 CaO SiO2 P2O5 Al2O3 Fe2O3 SrO K2O TiO2 BaO Na2O ZnO 含量 49.33 41.31 5.03 1.49 1.42 0.58 0.35 0.19 0.10 0.07 0.07 0.01 
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表 2 开路试验结果
Table 2. Results of open circuit test
产品名称 产率/% CaSO4·2H2O 纯度/% 白度/% 磷石膏精矿 41.25 94.37 40.5 中矿1 6.20 90.14 35.4 中矿2 11.75 91.36 36.1 中矿3 16.45 93.29 39.8 尾矿1 21.27 69.31 17.4 尾矿2 3.08 72.67 20.5 磷石膏原矿 100 73.12 19.4
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表 3 闭路试验结果
Table 3. Results of close circuit test
产品 SO3/% CaO/% SiO2/% P2O5/% Al2O3/% Fe2O3/% 产率/% 白度/% 纯度/% 可溶磷含量/% 可溶氟含量/% 精矿 51.64 42.88 2.76 1.17 0.72 0.30 67.98 41.1 96.41 0.07 0.18 尾矿1 45.27 34.13 11.93 2.07 3.39 1.77 22.84 18.3 71.46 − − 尾矿2 48.70 38.12 4.51 2.81 2.51 0.89 9.18 18.7 74.83 − − 原矿 49.33 41.31 5.03 1.49 1.42 0.58 100 19.4 73.12 0.48 0.54
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表 4 净化前后磷石膏制备建筑石膏块性能对比
Table 4. Properties comparison of β−hemihydrous gypsum blocks prepared by phosphogypsum before and after purification
性能 β−半水石膏
（原矿）β−半水石膏
（精矿）提升幅度/% 白度/% 27.8 46.3 66.5 2h抗折强度/MPa 2.67 3.28 22.8 2h抗压强度/MPa 8.11 9.25 14.1 3d干抗压强度/MPa 13.26 16.45 24.1
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