METODO PER IL RECUPERO SELETTIVO DI PIOMBO, ZINCO E CALCIO DA MATERIALII CHE LI CONTENGONO SOTTO FORMA DI OSSIDI O SALI INSOLUBILI IN ACQUA

摘要

A method for selectively recovering lead, zinc and calcium from materials containing them as oxides or salts not soluble in water, comprising leaching the above mentioned materials with ammonium chloride solution at a high temperature, separating the insoluble solid and treating the obtained solution with carbon dioxide and ammonia to precipitate separately lead, zinc and calcium carbonates from which dioxide is recovered by calcination or by leaching in acids.