JK Rotary Breakage Testing

The JKRBT was developed by JK Tech to allow for a rapid and accurate method to generate impact breakage data. The JKRBT has been shown to provide statistically similar results to the JKDWT in far less time, allowing for the tests to be carried out at a lower cost.

The full RBT requires between 60 and 100 kg of sample with a minimum top size of 63 mm. This ensures adequate sample is provided to acquire the necessary number of particles. The full RBT test is carried out at four particle sizes (45.0 x 37.5 mm, 31.5 x 26.5 mm, 22.4 x 19.0 mm, 16.0 x 13.2 mm) at four energy levels (0.10 kWh/t,  0.25 kWh/t,  1.00 kWh/t,  2.50 kWh/t).

The RBT lite test procedure uses a single size fraction and four energy levels to deliver A×b values. The standard RBT lite procedure is carried out at a particle size of 11.2 x 9.5 mm and four energy levels (0.20 kWh/t, 0.50 kWh/t, 1.00 kWh/t, 2.00 kWh/t) with their corresponding RBT operating RPM (1351, 2030, 2761, 3756). The size selected also allows for a rapid determination of the t10 with a 1 mm screen.

Full-scale results can be estimated based on calibration samples from the ore body. This approach uses a small number of samples that are subjected to the entire test and a larger number of samples to the abbreviated test after which a calibration is applied based on the variation of impact breakage properties by particle size. (For the RBT lite, JKTech consultants carry out the calibration of the results based on the full DWT.)