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1. (WO2007009379) A PROCESS FOR REDUCING THE CONTENT OF CARBONATES IN THE FLOW PATH OF ALUMINA PRODUCTION
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2007/009379 International Application No.: PCT/CN2006/001745
Publication Date: 25.01.2007 International Filing Date: 18.07.2006
IPC:
C01F 7/02 (2006.01) ,C01F 7/14 (2006.01)
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
7
Compounds of aluminium
02
Aluminium oxide; Aluminium hydroxide; Aluminates
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
7
Compounds of aluminium
02
Aluminium oxide; Aluminium hydroxide; Aluminates
04
Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
14
Aluminium oxide or hydroxide from alkali metal aluminates
Applicants:
中铝国际工程有限责任公司 CHINA ALUMINUM INTERNATIONAL ENGINEERING CORPORATION LIMITED [CN/CN]; 中国北京市金融大街33号通泰大厦B座15楼, Beijing 100032 B-15/F., Tongtai Mansion 33 Jinrong Street Xicheng District Beijing 100032, CN (AllExceptUS)
陈德 CHEN, De [CN/CN]; CN (UsOnly)
Inventors:
陈德 CHEN, De; CN
Agent:
中国专利代理(香港)有限公司 CHINA PATENT AGENT (H.K.) LTD.; 中国香港特别行政 区湾仔港湾道23号鹰君中心22字楼, Hong Kong 22/F, Great Eagle Centre 23 Harbour Road Wanchai Hong Kong, CN
Priority Data:
200510200400.818.07.2005CN
Title (EN) A PROCESS FOR REDUCING THE CONTENT OF CARBONATES IN THE FLOW PATH OF ALUMINA PRODUCTION
(FR) PROCEDE POUR LA REDUCTION DE TENEUR EN CARBONATES DANS LE CHEMIN D'ECOULEMENT DE PRODUCTION D'ALUMINE
(ZH) 氧化铝生产过程中降低流程中碳酸盐的方法
Abstract:
(EN) A process for reducing the content of carbonates in the flow path of alumina production, which comprises substituting the shaft kiln for rotary kiln for lime calcining in the production of aluminum oxide, wherein the content of carbon dioxide in the lime is 2˜3%. Instead of the current sintering method for Bayer process alkali supplementing procedure, it employs liquid caustic alkali containing NaOH ≥ 42% to supplement alkali into the Bayer process system. The process can reduce the content of carbonate in the process, which would eliminate the negative affect of carbonate and improve the efficiency of heat exchanger.
(FR) La présente invention a trait à un procédé pour la réduction de teneur en carbonates dans le chemin d'écoulement de production d'alumine, comprenant la substitution du four droit par un four rotatif pour la calcination de la chaux dans la production d'oxyde d'alumine, dans lequel la teneur en dioxyde de carbone dans la chaux est de 2$m(k)3 %. A la place du procédé de frittage courant pour la procédure de supplément d'alcali de procédé Bayer, il utilise l'alcali caustique liquide contenant du NaOH $m(G) 42 % pour le supplément d'alcali dans le système de procédé Bayer. Le procédé peut réduire la teneur en carbonate dans le traitement, ce qui permet d'éliminer l'effet négatif du carbonate et améliorer l'efficacité de l'échangeur thermique.
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SY, 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, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: Chinese (ZH)
Filing Language: Chinese (ZH)
Also published as:
IN292/CHENP/2008