METHOD OF DETERMINATION OF CONTENT OF FERROMAGNETIC SUBSTANCE IN MATERIAL UNDER TEST Russian patent published in 1996 - IPC

FIELD: routine monitoring of quality of iron ore in mining, processing and dressing. SUBSTANCE: sample of magnetic iron ore is poured in dish and is placed in converter coil. Then magnetic susceptibility k_n when both alternating and permanent magnetic fields are applied to the sample and k_o when only alternating field is applied to the sample, after which change in magnetic susceptibility Δ = K_o=K_н and ratio of magnetic susceptibility to its change are calculated. Content of ferromagnetic substance in the sample is determined by graduation relationship plotted beforehand by graduation relationship; magnitude of permanent magnetizing field is selected within a range of from 25 to 55 kA/m. EFFECT: enhanced reliability. 5 dwg, 1 tbl