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1. WO2022003747 - PROCESS FOR THE SIMULTANEOUS TREATMENT OF RESIDUES OF THE NON-FERROUS METALLURGICAL INDUSTRY TO PRODUCE PIGMENTS BASED ON IRON OXIDES AND OTHER VALUED PRODUCTS, IN ACCORDANCE WITH CIRCULAR ECONOMY STRATEGIES

Publication Number WO/2022/003747
Publication Date 06.01.2022
International Application No. PCT/IT2021/050209
International Filing Date 05.07.2021
IPC
C22B 1/06 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
1Preliminary treatment of ores or scrap
02Roasting processes
06Sulfating roasting
C22B 11/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
11Obtaining noble metals
C22B 7/02 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
7Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
02Working-up flue dust
C22B 7/04 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
7Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
04Working-up slag
C22B 47/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
47Obtaining manganese
CPC
C22B 1/06
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
1Preliminary treatment of ores or scrap
02Roasting processes
06Sulfating roasting
C22B 11/044
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
11Obtaining noble metals
04by wet processes
042Recovery of noble metals from waste materials
044from pyrometallurgical residues, e.g. from ashes, dross, flue dust, mud, skim, slag, sludge
C22B 47/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
47Obtaining manganese
C22B 7/02
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
7Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; ; Methods of a general interest or applied to the winning of more than two metals
02Working-up flue dust
C22B 7/04
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
7Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; ; Methods of a general interest or applied to the winning of more than two metals
04Working-up slag
Applicants
  • ECOTEC GESTIONE IMPIANTI S.R.L. [IT]/[IT]
Inventors
  • IMERITO, Aldo
  • RAGONA, Mario
  • PISU, Massimo
  • AZARA, Pierandrea
Agents
  • SANTI, Filippo
  • BALZANO, Francesca
  • BANCHETTI, Marina
  • BIONDINI, Daniele
  • BURCHIELLI, Riccardo
  • CATALDI, Silvia
  • DE FILIPPIS, Sara
  • FERRIERO, Paolo
  • GITTO, Serena
  • MULAS, Chiara
  • TIBURZI, Andrea
Priority Data
10202000001619203.07.2020IT
Publication Language English (en)
Filing Language Italian (IT)
Designated States
Title
(EN) PROCESS FOR THE SIMULTANEOUS TREATMENT OF RESIDUES OF THE NON-FERROUS METALLURGICAL INDUSTRY TO PRODUCE PIGMENTS BASED ON IRON OXIDES AND OTHER VALUED PRODUCTS, IN ACCORDANCE WITH CIRCULAR ECONOMY STRATEGIES
(FR) PROCÉDÉ POUR LE TRAITEMENT SIMULTANÉ DE RÉSIDUS DE L'INDUSTRIE MÉTALLURGIQUE NON FERREUSE POUR PRODUIRE DES PIGMENTS À BASE D'OXYDES DE FER ET D'AUTRES PRODUITS VALORISÉS, CONFORMÉMENT À DES STRATÉGIES D'ÉCONOMIE CIRCULAIRE
Abstract
(EN) Described is a process for the simultaneous treatment of residues of the non-ferrous metallurgical industry, in particular Waelz slag and residues deriving from thermal fuming processes of jarosite, goethite or KSS slag, comprising the following steps: - possible initial pre-treatment (A) of the material to be treated, to obtain homogeneous particle size characteristics; - thermal pre-treatment (B) by the addition of ammonium sulphate (or nitric acid and/or sulphuric acid mixed with ammonium sulphate or with another reagent capable of promoting a reaction with the Waelz slag which makes it possible to obtain firstly the formation of the reaction intermediate ammonium hydrogen sulphate, (NH4)HSC>4 and, subsequently and in sequence, the formation of soluble iron and manganese sulphates and the development of ammonia) and gradual increase in temperature from ambient temperature to a final temperature in the range 200 °C to 600 °C, in a neutral/oxidising environment, to obtain the conversion of the iron, and manganese if present in the material, into compounds such as iron sulphates, and, possibly, manganese sulphates, soluble in water, with the formation of ammonia; and - hydrometallurgical treatments (C), according to the following sub- steps: - addition of water and mixing, - correction of acidity up to a pH of 2 to 8 in an oxidising environment, to obtain the precipitation of the iron in the form of mixed oxyhydroxides. The invention also relates to the use of the precipitate thus obtained, after separating from the solution and purification, for the production of pigments based on iron oxide.
(FR) L'invention concerne un procédé de traitement simultané de résidus de l'industrie métallurgique non ferreuse, en particulier d'un laitier de Waelz et des résidus dérivant de procédés de fumigation thermique de laitier de jarosite, de goethite ou de KSS, comprenant les étapes suivantes : - un prétraitement initial possible (A) du matériau à traiter, pour obtenir des caractéristiques de taille particulaire homogènes ; - un prétraitement thermique (B) par l'addition de sulfate d'ammonium (ou d'acide nitrique et/ou d'acide sulfurique mélangés avec du sulfate d'ammonium ou avec un autre réactif apte à favoriser une réaction avec le laitier de Waelz qui permet d'obtenir d'abord la formation du sulfate d'hydrogène d'ammonium intermédiaire de réaction, (NH4)HSC > 4 et, par la suite et en séquence, la formation de sulfates de fer et de manganèse solubles et le développement d'ammoniac) et une augmentation progressive en température, de la température ambiante à une température finale dans la plage de 200 °C à 600 °C, dans un environnement neutre/oxydant, pour obtenir la conversion du fer, et du manganèse s'il est présent dans le matériau, en composés tels que des sulfates de fer, et, éventuellement, des sulfates de manganèse, solubles dans l'eau, avec la formation d'ammoniac ; et - des traitements hydrométallurgiques (C), selon les sous-étapes suivantes : - une addition d'eau et un mélange, - une correction d'acidité jusqu'à un pH de 2 à 8 dans un environnement oxydant, pour obtenir la précipitation du fer sous forme d'oxyhydroxydes mélangés. L'invention concerne également l'utilisation du précipité ainsi obtenu, après séparation par rapport à la solution et purification, pour la production de pigments à base d'oxyde de fer.
Latest bibliographic data on file with the International Bureau