尾矿膏体流变学塌落度与屈服应力试验研究

Test study on slump and yield stress of tailings paste rheology

随着我国经济建设对矿产资源需求的不断增长,选矿废物—尾矿的处置问题亟待解决。矿山尾矿膏体填充和地表堆放将是今后的发展方向。而尾矿膏体的输送及堆放系统的设计需要膏体流变参数试验为依据,常规试验主要是采用流变仪、黏度计及塌落度试验。而塌落度试验因其设备操作简单而成为现场进行流变学参数测定的实用方法。为了进一步探讨塌落度圆柱体尺寸对试验结果的影响,笔者利用不同高度、不同直径的圆柱筒及HAAKE VT550黏度计进行试验,用Bingham、HerschelBulkley和Casson 3个流变学模型进行数据分析。两种试验方法的数据比较表明,高度为100 mm、直径为50 mm的圆柱筒可得到最佳的试验结果。同时对膏体塌落度试验理论模型及其近似公式结果进行了比较,研究结果可为尾矿膏体系统的工艺参数、膏体的地表堆放及膏体的充填设计提供可靠的设计依据。

With the increasing demand of mineral resources in the economic development in China, the disposal of mineral processing waste- tailings needs urgent solution. Mine tailings paste fi lling and surface stacking will be the development direction in the future. The design of the transportation and storage system of tailings paste requires the support of rheological parameters of paste. The common test mainly involves rheometer, viscometer and slump test, while the slump test was regarded as the practical method for field determination of rheological parameters due to its simple facility and operation. In order to further investigate the infl uence of the size of slump cylinder on the test results, the cylinders with various height and various diameter were applied to the test, meanwhile HAAKE VT550 viscometer was applied in the test. In addition, three rheological models, Bingham, Herschel-Bulkley and Casson, were applied to conduct data analysis. The contrast of test data of two test methods showed the best test results were obtained by using the cylinder with the height of 100 mm and the diameter of 50 mm. At last, the theoretical model of the paste slump test was compared with its approximate formula results, the obtained results provided reliable theoretical reference for the determination of the process parameters and surface staking of the tailing paste system as well as the filling design of the paste.