Device for rapidly judging conductivity type of metal mineral powder material

The invention relates to the technical field of semiconductor minerals, and discloses a metal mineral powder material conductivity type rapid judgment device which comprises a working circuit, a micro electromotive force measurement circuit, an excitation circuit, an inverted T-shaped sample bracket and a sample to be detected. During measurement, K1, K2 and K3 are connected with a key above, E1, E2, R1 and R2 are adjusted, the current of the working circuit flows into the right side and flows out of the left side of the K1, the current of the excitation circuit flows into the right side and flows out of the right side of the K2, the direction of the magnetic field in the Helmholtz coil is from right to left, and mV1 is measured through the micro electromotive force measuring circuit; the K1 and the K2 are connected with a lower key, the current of the working circuit flows into the left side from the right side of the K1, the current of the excitation circuit flows into the left side from the right side of the K2, the direction of a magnetic field in the Helmholtz coil is from left to right, and mV2 is measured; and mV = (mV1 + mV2)/2 is calculated. If mV is a positive value, the conduction type is P type, and if mV is a negative value, the conduction type is N type.