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1. (WO2018218294) PROCESS FOR PRODUCING MAGNESIUM OXIDE FROM ALKALINE FLY ASH OR SLAG
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Pub. No.: WO/2018/218294 International Application No.: PCT/AU2018/050529
Publication Date: 06.12.2018 International Filing Date: 31.05.2018
IPC:
C22B 7/02 (2006.01) ,C22B 7/04 (2006.01) ,C22B 3/08 (2006.01) ,C22B 3/10 (2006.01) ,C01F 5/10 (2006.01) ,C01F 5/12 (2006.01)
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
B
PRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
7
Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
02
Working-up flue dust
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
B
PRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
7
Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
04
Working-up slag
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
B
PRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3
Extraction of metal compounds from ores or concentrates by wet processes
04
by leaching
06
in inorganic acid solutions
08
Sulfuric acid
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
B
PRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3
Extraction of metal compounds from ores or concentrates by wet processes
04
by leaching
06
in inorganic acid solutions
10
Hydrochloric acid
C CHEMISTRY; METALLURGY
01
INORGANIC CHEMISTRY
F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
5
Compounds of magnesium
02
Magnesia
06
by thermal decomposition of magnesium compounds
10
by thermal decomposition of magnesium chloride with water vapour
C CHEMISTRY; METALLURGY
01
INORGANIC CHEMISTRY
F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
5
Compounds of magnesium
02
Magnesia
06
by thermal decomposition of magnesium compounds
12
by thermal decomposition of magnesium sulfate, with or without reduction
Applicants:
MONASH UNIVERSITY [AU/AU]; Wellington Road Clayton, Victoria 3800, AU
Inventors:
ZHANG, Lian; AU
HOSSEINI, Tahereh; AU
Agent:
PHILLIPS ORMONDE FITZPATRICK; Level 16 333 Collins Street Melbourne, Victoria 3000, AU
Priority Data:
201790208801.06.2017AU
Title (EN) PROCESS FOR PRODUCING MAGNESIUM OXIDE FROM ALKALINE FLY ASH OR SLAG
(FR) PROCÉDÉ DE PRODUCTION D’OXYDE DE MAGNÉSIUM À PARTIR DE CENDRES VOLANTES OU DE SCORIES ALCALINES
Abstract:
(EN) The invention provides a process for producing magnesium oxide from fly ash or slag comprising magnesium and iron, the process comprising: leaching the fly ash or slag with an aqueous mineral acid solution to produce a leaching solution and a residue, the leaching solution comprising a magnesium salt and an iron salt; precipitating the iron salt by increasing the pH of the leaching solution to above 3.5, and separating the leaching solution from the precipitated iron salt; and forming magnesium oxide by decomposing the magnesium salt present in the leaching solution.
(FR) La présente invention concerne un procédé de production d’oxyde de magnésium à partir de cendres volantes ou de scories comprenant du magnésium et du fer, le procédé comprenant : la lixiviation des cendres volantes ou des scories avec une solution aqueuse d’acide minéral pour produire une solution de lixiviation et un résidu, la solution de lixiviation comprenant un sel de magnésium et un sel de fer ; la précipitation du sel de fer par augmentation du pH de la solution de lixiviation au-dessus de 3,5, et la séparation de la solution de lixiviation du sel de fer précipité ; et la formation d’oxyde de magnésium par décomposition du sel de magnésium présent dans la solution de lixiviation.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)