Determination of separator efficiency curve from areal measurements on polished sections

A method of determining the efficiency curves - i.e. partition number versus particle volumetric grade - for two-product separators is presented. Areal grade measurements are made on polished sections of the feed, the concentrate and the tailings of the separator and a kernel-based inversion technique is then used to obtain the volumetric grade distribution of the three assemblages of particles. The inversion is constrained by mass-balance equations. A plain kernel (by number of occurrences) and a weighted kernel (each occurrence counted with its area) are used for the solution. The weighted damped least-squares solution minimizes balance error and provides the partition curves of the separator. The method is tested on synthetic data from computer-generated areal grade measurements. Comparison of the derived volumetric distributions and partition curves with the original (simulated) liberation spectra of the feed and products of the separators allows the efficiency of the method as a means of evaluating the performance of a separator to be judged. It is concluded that the method offers a valid alternative to the tedious conventional procedure of conducting experiments with heavy liquids. \ua9 The Institution of Mining and Metallurgy 1999

METHOD FOR TOMOGRAPHIC RECONSTUCTION OF A SAMPLE Patent AU2014902582 - filed

The present invention relates to tomographic reconstruction of a sample. In a particular form the present invention relates to reconstruction of a micro-tomographic scan of a mineral sample to determine sample composition

3D Structural Analysis of Ground-Wall Insulation of ac Rotating Machines Using X-Ray Tomography

The X-ray computed tomography has been applied here to inspect the internal features of two types of ground-wall insulation systems of ac rotating machines. Samples extracted from complete coils were scanned and their internal structure was analyzed by means of virtual slicing and 3D rendering procedures. Specialized software tools have been used to discover the morphological features of both the distributed voids and the high-density anomalies. It is was found that the resin penetration as well as the density and the geometries of the distributed micro-voids depend from the tape characteristics

Inspection of Ground-Wall Insulation for ac Rotating Machines using X-Ray Tomography

Results of investigations having the purpose to find out possible correlations between the internal structure of ground-wall insulation of ac rotating machines and dissipation factor (tan\uf064) and Partial Discharge (PD) measurement results, are presented in this paper. After testing the complete coils, portions of ground-wall insulation were removed and analyzed using X-ray computed tomography. The 3D digital structure were reconstructed stacking the tomographic slices and specialized image processing tools were used both to visualize the void distribution and to estimate their morphological attributes. Histograms representing the number of distributed micro-voids as a function of their volume have been adopted to verify how the magnitude and density of micro-voids are reflected in the tan\uf064 and PD test results