Process for recovery and purifying of finely divided heavy materials

Claim 1

A PROCESS FOR RECUPERATING AND PURIFYING HIGH SPECIFIC GRACITY SOLID PARTICLES PRESENT IN THE RINSING WATER OF A WASHING PLANT FOR MINERALS SUCH AS RAW COAL, THE WASHING PLANT OPERATING BY MEANS OF SUSPENSION IN WHICH SAID HIGH SPECIFIC GRAVITY SOLID PARTICLES FORM THE DISCONTINUOUS PHASE, THE HIGH SPECIFIC GRAVITY SOLID PARTICLES BEING CONSTITUTED IN PART BY MAGNETIZABLE AND IN PART BY NON-MAGNETIZABLE MATERIALS, THE PROCESS COMPRISING THE STEPS OF MAGNETICALLY SEPARATING THE MAGNETICABLE HIGH SPECIFIC GRAVITY SOLID PARTICLES FROM THE RINSING WATER, REMOVING PARTICLES HAVING A SIZE EXCEEDING THE MAXIMUM PARTICLE SIZE OF HIGH SPECIFIC GRAVITY SOLID PARTICLES FROM THE REMAINING WATER WITH A FINE SCREEN, SEPARATING THE NON-MAGNETIZABLE HIGH SPECIFIC GRAVITY SOLID PARTICLES IN THE RINSING WATER HYDRAULICALLY FROM LOW SPECIFIC GRAVITY SOLID PARTICLES STILL SUSPENDED THEREIN, RECYCLING ONLY PART OF THE RINSING WATER CONTAINING SAID LOW SPECIFIC GRAVITY SOLID PARTICLES, DEPOSITING THE NON-MAGNETIZABLE HIGH SPECIFIC GRAVITY SOLID PARTICLES, AND RETURNING THE MAGNETIZABLE AND THE NON-MAGNETIZABLE HIGH SPECIFIC GRAVITY SOLID PARTICLES TO THE SUSPENSION OF THE WASHING PLANT.