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1. WO2020115369 - METHOD OF EXTRACTING AND CARBONATING CALCIUM FROM ALKALINE INDUSTRIAL WASTE OR BY-PRODUCT MATERIALS

Publication Number WO/2020/115369
Publication Date 11.06.2020
International Application No. PCT/FI2019/050871
International Filing Date 04.12.2019
IPC
C22B 3/14 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3Extraction of metal compounds from ores or concentrates by wet processes
04by leaching
12in inorganic alkaline solutions
14containing ammonia or ammonium salts
C22B 7/00 2006.01
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
C22B 7/04 2006.01
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 26/20 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
26Obtaining alkali, alkaline earth metals or magnesium
20Obtaining alkaline earth metals or magnesium
C01F 11/18 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE EARTH METALS
11Compounds of calcium, strontium, or barium
18Carbonates
CPC
C01F 11/182
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
11Compounds of calcium, strontium, or barium
18Carbonates
182Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
C21B 2400/02
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
BMANUFACTURE OF IRON OR STEEL
2400Treatment of slags originating from iron or steel processes
02Physical or chemical treatment of slags
C21B 3/06
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
BMANUFACTURE OF IRON OR STEEL
3General features in the manufacture of pig-iron
04Recovery of by-products, e.g. slag
06Treatment of liquid slag
C21C 2100/04
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
2100Exhaust gas
04Recirculation of the exhaust gas
C22B 3/14
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
3Extraction of metal compounds from ores or concentrates by wet processes
04by leaching
12in inorganic alkaline solutions
14containing ammonia or ammonium salts
C22B 7/007
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
006Wet processes
007by acid leaching
Applicants
  • AALTO UNIVERSITY FOUNDATION SR [FI]/[FI]
Inventors
  • JÄRVINEN, Mika
  • ELONEVA, Sanni
Agents
  • LAINE IP OY
Priority Data
2018604704.12.2018FI
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD OF EXTRACTING AND CARBONATING CALCIUM FROM ALKALINE INDUSTRIAL WASTE OR BY-PRODUCT MATERIALS
(FR) PROCÉDÉ D'EXTRACTION ET DE CARBONATATION DE CALCIUM À PARTIR DE DÉCHETS INDUSTRIELS ALCALINS OU DE MATÉRIAUX DE SOUS-PRODUITS
Abstract
(EN)
The present invention concerns a process for producing calcium carbonate from a calcium- containing alkaline slag material, the process containing the steps of - extracting the alkaline slag material in a series of extraction steps, including at least 2 extraction steps, using extraction solvent(s) containing salt in an aqueous solution, whereby a calcium-containing filtrate and a residual slag is formed in each extraction step, - separating the residual slag from the filtrate after each extraction step, - carrying each residual slag to the following extraction in the series of extractions, to be used as raw material in said following extraction, and discarding the residual slag separated from the last extraction,- carrying each filtrate to the previous extraction in the series of extractions, to be used as extraction solvent in said previous extraction, and carrying the first filtrate, separated from the first extraction step, to a carbonating step, - carbonating calcium as calcium carbonate from the first filtrate, the first filtrate also used as the carbonation solvent, and using a carbonation gas, whereby calcium carbonate precipitates, - separating and recovering the calcium carbonate from the remaining carbonation solvent, and - recycling the remaining carbonation solvent to the last extraction step in the series of extraction steps, to be used as extraction solvent.
(FR)
La présente invention concerne un procédé de production de carbonate de calcium à partir d'un matériau de laitier alcalin contenant du calcium, le procédé comprenant les étapes consistant à - extraire le matériau de laitier alcalin dans une série d'étapes d'extraction, comprenant au moins 2 étapes d'extraction, à l'aide d'un ou de plusieurs solvants d'extraction contenant du sel dans une solution aqueuse, un filtrat contenant du calcium et un laitier résiduel étant formés dans chaque étape d'extraction, - séparer le laitier résiduel du filtrat après chaque étape d'extraction, - porter chaque laitier résiduel à l'extraction suivante dans la série d'extractions, à utiliser comme matière première dans ladite extraction suivante, et éliminer le laitier résiduel séparé de la dernière extraction, - porter chaque filtrat à l'extraction précédente dans la série d'extractions, à utiliser comme solvant d'extraction dans ladite extraction précédente, et transporter le premier filtrat, séparé de la première étape d'extraction, à une étape de carbonatation, - carbonater du calcium sous forme de carbonate de calcium à partir du premier filtrat, le premier filtrat étant également utilisé en tant que solvant de carbonatation, et à l'aide d'un gaz de carbonatation, et donc des précipités de carbonate de calcium, - séparer et récupérer le carbonate de calcium du solvant de carbonatation restant, et - recycler le solvant de carbonatation restant jusqu'à la dernière étape d'extraction dans la série d'étapes d'extraction, à utiliser en tant que solvant d'extraction.
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