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HomeMiningMetallurgy & Process DesignUnit Operations & MetallurgyComminution & BeneficiationStatic Pressure Test (SPT)
SPT* is used to estimate the energy needed to achieve a specific grain size reduction by HPGR. The test measures the energy consumed when crushing a dry sample of ore in a steel sample container using a hydraulic press. The test is run in closed circuit to generate a product that is 100% passing 6 mesh (3.35mm).
The High Pressure Grinding Index (HPG) is determined from the 80% passing value of the feed and product sizes and energy used in breakage. The HPG Index can be determined at a range of pressures and is used to show the ore body hardness profile. Throughput in commercial units is predicted after plant calibration.
Feed Sample Requirements:At least 7 kg of passing 3⁄4” ore (with no more than 80% passing 1⁄2”).
SGS's team of experienced engineers will conduct the SPT in combination with other bench-scale tests. These data can then be used to simulate grinding circuits. The use of such methodologies provides you with a bankable solution that is unmatched in its rigor. Contact us to determine your energy requirements.
*Bulled D. and Husain K., (2008) "The Development of a Small-scale Test to Determine Work Index for High Pressure Grinding Rolls", in Proceedings of the 40th Annual Canadian Mineral Processors Conference - 2008.