织金新华含稀土磷矿浮选动力学及三维图形表征

Kinetics and Three-Dimensional Graph Characterization on Flotation of Zhijin Xinhua REE-Bearing Phosphorite Ores

对织金新华含稀土磷矿浮选动力学进行了研究,在典型的一级浮选动力学理论模型ε=ε∞(1-e-kt)的基础上,推出磷矿反浮选速率模型ε=ε∞+(100-ε∞)e-k(t+θ),并根据动力学正交实验,采用三维表面图和等高线图对织金新华磷矿浮选动力学参数进行了表征。结果表明,反浮选速率模型能很好地描述含稀土磷矿物(以∑REO表示)和脉石矿物(以MgO表示)回收率随时间变化的规律,并以修正的浮选速率常数kmod和选择性指数SI来衡量含稀土磷矿物和脉石矿物分选效果的好坏。通过浮选正交动力学实验研究,捕收剂WF-01用量是影响∑REO修正速率常数kmod最主要的因素,而抑制剂H3PO4用量是影响选择性指数SI最主要的因素。采用三维表面图和等高线线图对两种药剂组合方式下∑REO的浮选动力学参数变化进行表征时表明,磷矿反浮选时,如捕收剂WF-01用量为0.8 kg.t-1,为获得较好的含稀土磷矿物与白云石矿物的分选效果,可适当增加抑制剂H3PO4用量。

The Kinetics and three-dimensional graph characterization on flotation were studied for Zhijin Xinhua REE-bearing phosphorite ores.Based on the classical first-order flotation rate model of ε=ε∞（1-e-kt）,the reverse flotation rate model of ε=ε∞＋（100-ε∞）e-k（t＋θ） was obtained,which could fit the data very well to describe the effect of flotation time on recovery rate of ∑REO and MgO in concentrate.Furthermore,a modified flotation rate constant kmod defined as the product of ε∞ and k,and selectivity index SI defined as the ratio of the modified rate constant of valuables to the modified rate constant of gangue,were also used to better measure the separability between bearing-REE phosphoric mineral and gangue mineral.The kinetics based on flotation orthogonal experiment showed that the collector WF-01 dose was the most significant variable affecting kmod for ∑REO,while depressant H3PO4 dosage affected the SI significantly.In order to further analyze the effect of compounding reagents with WF-01 and H3PO4 on parameters kmod and SI,the response surface graphs and the contour graphs were drawn for kmod of ∑REO,kmod of MgO and SI.The result indicated that the excellent separation between ∑REO and MgO could be obtained by increasing depressant H3PO4 dosage in the condition of collector WF-01 dosage of 0.8 kg·t-1 when reverse flotations were carried out for Zhijin Xinhua phosphorite ores.