Method of dewatering granulated-slag slurry
AssigneeSIDMAR Maritieme Staalnijverheid NV., Siderurgie Maritime S.A.
InventorGuido Monteyne
Life of this patent
Estimating the term…
Abstract
Molten slag is granulated with water to produce a granulated-slag/water sry that is fed into the bottom of a horizontally extending foraminous drum. This drum has radially inwardly extending vanes and is rotated to lift up the granulated slag and separate it from the water, discharging the slag onto a conveyor belt for storage or further use. The water running out of the slag slurry is recirculated for use in the initial granulation step for the molten slag stream.
Claims8
A method of treating a stream of molten slag, said method comprising the steps of continuously and concomitantly:
- granulating said stream of molten slag with water to produce a granulated-slag/water slurry;
- feeding said slurry at a relatively low location onto the inside surface of an endless and annular foraminous substrate;
- rotating said substrate to lift said slurry to a relatively high location so that water runs off through said substrate and said slag is dewatered;
- dropping the dewatered granulated slag from said substrate at said high location onto a conveyor within said annular substrate;
- and
- transporting the dewatered slag with said conveyor away from said substrate.
A method of treating a stream of molten slag, said method comprising the steps of continuously and concomitantly:
- granulating said stream of molten slag with process water to produce a granulated-slag/water slurry;
- feeding said slurry at a relatively low location onto the inside surface of a foraminous drum having a central axis;
- rotating said drum about said axis to lift said slurry to a relatively high location so that water runs off through said substrate and said slag is dewatered;
- driving the dewatered granulated slag from said substrate at said high location with a compressed-gas stream and dropping said dewatered granulated slag from said substrate at said high location onto a conveyor within said drum;
- transporting the dewatered slag driven and dropped from said substrate away from said substrate with said conveyor;
- decanting the water separated from said slurry into a particle-laden fraction and a particle-free fraction;
- using said particle-laden fraction as said process water in the granulation step;
- and
- cooling said particle-free fraction.
Dependencies are inferred from the claim text.