The invention relates to a magnetic matrix for a high-intensity magnetic separator, which matrix is fed with a pulp containing magnetic and nonmagnetic particles, the magnetic matrix (8) comprising a series of metal plates (7) with grooves on both sides thereof, the grooved plates being arranged in parallel rows separated by identical spaces (6) from each other within a housing, each face of each grooved metal plate (7) having ridges aligned with the valleys of the face facing it of the adjacent grooved metal plate (7), and corrugated expanded sheets (12) are arranged in the respective spaces (6) between adjacent grooved plates (7), with the corrugations of the corrugated expanded sheets (12) following the ridge-valley alignment of the respective grooved plates (7).
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