Desilication Research of Sichuan Phosphogypsum by Flotation
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摘要:
这是一篇矿物加工工程领域的论文。磷石膏是生产湿法磷酸时产生的副产物。目前，我国磷石膏每年新增排放量较大，存在环保和安全风险，严重制约了磷化工企业的可持续健康发展。针对四川磷石膏中二氧化硅含量高的问题，采用反浮选工艺进行了磷石膏脱硅实验研究。实验结果表明，在矿浆自然pH值为5.3，采用BK421B为捕收剂，通过“一粗一精一扫，中矿顺序返回”的反浮选工艺流程，可以获得产率为89.63%，二水硫酸钙品位为96.85%、SiO2含量为1.85%，二水硫酸钙回收率96.72%的石膏精矿，取得了良好的选矿指标，为磷石膏的资源化利用提供了技术支持。
Abstract:This is a paper in the field of mineral processing engineering. Phosphogypsum is a by-product produced during the production of wet process phosphoric acid. At present, China's phosphogypsum has a large annual new emissions, environmental and safety risks, which seriously restrict the sustainable and healthy development of phosphorus chemical enterprises.In order to solve the problem of high silica content in Sichuan phosphogypsum, the desilication tests werecarried by reverse flotation process.The test results showed that through reverse flotation process of "one roughing, one cleaning, one scavenging, middling returning in sequence", gypsum concentrate was obtained with yield of 89.63%, grading 1.85% SiO2, grading 96.85% calcium sulfate dihydrate with recovery of 96.72%, under conditions of pulp pH valuewith 5.3, BK421B as collector. The research provides technical support for resource utilization of phosphogypsum.
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Key words:
- Phosphogypsum /
- Mineral processing engineering /
- Harvesting agents /
- Desilication /
- Flotation
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表 1 磷石膏主要化学成分及含量/%
Table 1. Main chemical composition of phosphogypsum
CaO SO3 SiO2 Fe K2O Na2O Al2O3 P2O5 MgO C 31.58 41.25 5.72 0.098 0.096 0.16 0.38 0.95 0.083 0.068 
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表 2 磷石膏粒度筛析结果
Table 2. Screening results of phosphogypsum
粒级/mm 产率/% 负累计/% +0.2 0.52 100.00 -0.2+0.15 1.66 99.48 -0.15+0.105 3.50 97.81 -0.105+0.074 22.86 94.32 -0.074+0.045 21.85 71.46 -0.045+0.038 5.20 49.61 -0.038+0.030 12.74 44.41 -0.030 31.67 31.67 合计 100.00
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表 3 闭路实验结果
Table 3. Results of locked-cycle test
产品名称 产率/% 品位/% 回收率/% CaSO4·2H2O SiO2 CaSO4·2H2O SiO2 精矿 89.63 96.85 1.85 96.72 27.88 尾矿 10.37 28.36 41.36 3.28 72.12 原矿 100.00 89.75 5.95 100.00 100.00
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