SOLID-LIQUID-SEPARATION PROCESSING METHOD, AND HYDROMETALLURGICAL METHOD FOR NICKEL OXIDE ORE

摘要

A solid-liquid-separation processing method wherein solids in a slurry are separated and removed by applying multistage washing to the slurry, wherein the case where the number of connected thickening-apparatus stages is smaller, the clarity of obtained supernatant liquid is improved. In the solid-liquid-separation processing method wherein thickening apparatuses each equipped with agitation and sedimentation tanks having an overflow unit in a peripheral portion to discharge supernatant liquid and cylindrical feed well vertically arranged at a central portion are provided in multiple stages; multistage washing is applied to a slurry to separate solids in the slurry therefrom and obtain a solution from which the solids are removed, when a flocculant configured to flocculate the solids in the slurry is added, a flocculant predetermined proportion is added to a feed well in a first-stage thickening apparatus, and remainder of the flocculant is added to an overflow unit in a second-stage thickening apparatus.

主权项

1. A solid-liquid-separation processing method in which thickening apparatuses each equipped with an agitation tank and a sedimentation tank having an overflow unit in a peripheral portion thereof to discharge supernatant liquid and a cylindrical feed well vertically arranged at a central portion thereof are provided in multiple stages, and multistage washing is applied to a slurry to separate solids in the slurry and obtain a solution from which the solids are removed,
wherein, at the time of adding a flocculant configured to flocculate the solids in the slurry, a predetermined proportion of the flocculant is added to a feed well in a first-stage thickening apparatus, and a remainder of the flocculant is added to an overflow unit in a second-stage thickening apparatus.