超细粉磨活化河北某磷矿粉机理研究

本文采用行星式球磨机对河北省某地磷矿粉进行干式粉磨,考察了不同磨矿时间条件下粉磨产品的颗粒形貌、结晶程度、比表面积以及表面自由能,系统分析了超细粉磨过程中磷矿粉性质变化规律及其与枸溶率的关系。结果表明:随着粉磨时间由0min延长至180min,粗粒级磷矿粉逐渐粉碎为细小颗粒,磷灰石结晶程度明显降低、无定形化增加,磷矿粉比表面积与表面自由能分别由0.67m²/g和24.08mN/m增加至5.06m²/g和38.69mN/m。磷矿粉比表面积及表面自由能与枸溶率呈较强正相关,枸溶率由9.14%大幅增加至61.68%。上述研究结果对丰富超细粉磨活化磷矿粉理论基础具有一定的意义。

Study on Mechanism of Activated Phosphate Rock Powder in Hebei by Ultrafine Grinding

The phosphate rock powder from Hebei Province was dry-milled by a planetary ball mill. The particle morphology, crystallinity, specific surface area and surface free energy of the grinding products at different grinding time were investigated. The variation law of the phosphate rock properties in the process of ultrafine grinding and its relationship with the solubility ratio of phosphorus ore in citric acid was systematically analyzed. The results showed that the coarse-grained phosphate rock is gradually pulverized into fine particles while the degree of crystallinity of the apatite in the phosphate rock is significantly reduced, thus the amorphous form is increased, with the grinding time extending from 0 min to 180 min. Meanwhile, the specific surface area and surface of the phosphate rock are increased, which increase from 0.67 m2/g and 24.08 mN/m to 5.06 m2/g and 38.69 mN/m, respectively. The specific surface area and surface free energy of phosphate rock are positively correlated with the enthalpy solubility ratio of phosphorus ore in citric acid, and the solubility ratio of phosphorus ore in citric acid increase significantly from 9.14% to 61.68%. The above research results provide certain significance for enriching the theoretical basis of phosphate rock powder activated by ultrafine grinding.