Experimental Study on Ultra-fine Grinding of a Phosphate Ore in Hebei Province by Stirred Mill
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摘要:
这是一篇矿物加工工程领域的论文。采用超细粉磨技术处理磷矿，可改变磷矿中含磷矿物的物理化学性质，从而提高磷矿中磷的溶解与释放，使其可作为磷肥使用。搅拌磨机作为超细粉磨设备，用其处理磷矿的可行性与工艺参数对磨矿效果影响的研究尚不完善。本文采用立式搅拌磨机对河北某磷矿进行湿法磨矿实验，粉磨产品的粒度分布通过NKT6100-D型激光粒度仪进行检测，探究磨矿工艺参数对产品粒度组成以及新生成粒级含量的影响，并通过R-R方程将产品粒度参数化分析，确定较适宜的工艺参数。结果表明，在搅拌器转速550 r/min、磨矿浓度65%、充填率60%、料球比0.5和磨矿时间30 min的条件下，获得有效磷含量和枸溶率分别为8.75%和74.03%，颗粒特征参数b为0.371、均匀性系数n为1.426的粉磨产品，可见用搅拌磨机对磷矿进行超细粉磨处理是可行的。
Abstract:This is a paper in the field of mineral processing engineering. Application of ultra-fine grinding technology to treat phosphate ore can change the physical and chemical properties of phosphate containing minerals in phosphate ore, thus improving the dissolution and release of phosphorus in phosphate ore, so that it can be used as phosphate fertilizer. As an ultra-fine grinding equipment, the feasibility of using stirred mill to treat phosphate ore and the research on the influence of process parameters on grinding effect are not perfect. A phosphate ore in Hebei Province was wet ground by a vertical stirring mill in this paper.The particle size distribution of the ground product was detected by NKT6100-D laser particle size analyzer.The effect of grinding process parameters on the particle size composition of product and the content of newly formed particles was explored, and the product particle size was parametrically analyzed by R-R equation to determine the more appropriate operating process parameters. The results showed that under the conditions of agitator speed of 550 r/min, grinding concentration of 65%, filling rate of 60%, feed to ball ratio of 0.5 and grinding time of 30 min, the available phosphorus content and phosphorus solubility in citric acid of 8.75% and 74.03%, particle characteristic parameter b of 0.371 and uniformity coefficient n of 1.426 were obtained. It can be seen that it is feasible to use a vertical stirring mill for ultra-fine grinding of phosphate ore.
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表 1 磷精矿化学多元素分析结果/%
Table 1. Results of chemical multi-element analysis of phosphate concentrate
P2O5 CaO SiO2 Al2O3 MgO TFe F 27.07 41.92 12.25 2.77 1.84 5.50 2.17 
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表 2 不同搅拌器转速下粉磨产品R-R方程回归结果
Table 2. Regression results of R-R equation for milling products with different stirrer revolving speed
转速/（r·min-1） 350 400 450 500 550 b 0.195 0.218 0.230 0.267 0.306 n 1.147 1.152 1.180 1.142 1.121 R2 0.997 0.996 0.995 0.995 0.998
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表 3 不同磨矿浓度下粉磨产品R-R方程回归结果
Table 3. Regression results of R-R equation for milling products with different pulp concentrations
磨矿浓度/% 50 55 60 65 70 b 0.275 0.289 0.324 0.342 0.298 n 1.116 1.152 1.215 1.208 1.164 R2 0.997 0.997 0.997 0.997 0.992
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表 4 不同充填率下粉磨产品R-R方程回归结果
Table 4. Regression results of R-R equation for milling products with different filling rates
充填率/% 40 45 50 55 60 65 70 b 0.320 0.334 0.326 0.385 0.383 0.391 0.386 n 1.134 1.127 1.167 1.224 1.473 1.404 1.231 R2 0.997 0.997 0.997 0.998 0.999 0.998 0.998
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表 5 不同料球比下粉磨产品R-R方程回归结果
Table 5. Regression results of R-R equation of milling products with different ratio of material to ball
料球比 0.3 0.4 0.5 0.6 0.7 b 0.341 0.354 0.369 0.373 0.355 n 1.478 1.536 1.579 1.388 1.241 R2 0.998 0.998 0.998 0.997 0.993
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表 6 不同磨矿时间下粉磨产品R-R方程回归结果
Table 6. Regression results of R-R equation for milling products with different grinding time
时间/min 10 20 30 40 50 b 0.206 0.327 0.371 0.384 0.366 n 1.067 1.236 1.426 1.507 1.650 R2 0.989 0.991 0.996 0.998 0.996
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