(WO/1996/026902) CALCIUM CARBONATE PRECIPITATION METHOD
- Biblio. Data
- Description
- Claims
- National Phase
- Notices
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| Latest bibliographic data on file with the International Bureau
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| IPC: | C01F 11/18 (2006.01) | ||||||||||||||||||
| Applicants: | PRETORIA PORTLAND CEMENT COMPANY LIMITED [ZA/ZA]; 11 Sherborne Road, Parktown, ZA-2193 Johannesburg (ZA) (All Except US). GOMERSALL, John, Edward [GB/ZA]; (ZA) (All Except US). RAMSAY, James, Ian [GB/ZA]; (ZA) (US Only). | ||||||||||||||||||
| Inventor: | RAMSAY, James, Ian; (ZA). | ||||||||||||||||||
| Agent: | GEERING, Keith, Edwin; Reddie & Grose, 16 Theobalds Road, London WC1X 8PL (GB). | ||||||||||||||||||
| Priority Data: |
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| Title: | CALCIUM CARBONATE PRECIPITATION METHOD | ||||||||||||||||||
| Abstract: | A method for producing precipitated calcium carbonate by reacting an aqueous solution of calcium nitrate [Ca(NO¿3?)¿2?] with an aqueous solution of ammonium carbonate [(NH¿4?)¿2?CO¿3?] and allowing calcium carbonate to precipitate from the resultant mixture containing nitrate [NH¿4?NO¿3?] in the mother liquor, the process being characterised in that: (i) the calcium nitrate [Ca(NO¿3?)¿2?)] solution utilised in the processes is prepared by slaking lime [CaO] in water in the presence of ammonium nitrate [NH¿4?NO¿3?] to form calcium nitrate [Ca(NO¿3?)¿2?] and ammonium hydroxide [NH¿4?OH] in solution, filtering the solution to render it solids free, and heating the filtrate to dissociate the ammonium hydroxide [NH¿4?OH] and to drive ammonia gas [NH¿3?] from the solution; (ii) the ammonium carbonate (NH¿4?)¿2?CO¿3? solution utilised is prepared by absorbing ammonia gas [NH¿3?] and carbon dioxide gas [CO¿2?] in water, the ammonia gas preferably being derived from the step in (i) above in which the Ca(NO¿3?)¿2? solution is heated; and (iii) the ammonium nitrate used is derived from the precipitation phase during which calcium carbonate is precipitated from the mother liquor containing ammonium nitrate. | ||||||||||||||||||
| Designated States: |
AL, AM, AT, AU, AZ, BB, BG, BR, BY, CA, CH, CN, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IS, JP, KE, KG, KP, KR, KZ, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN. African Regional Intellectual Property Org. (ARIPO) (KE, LS, MW, SD, SZ, UG) Eurasian Patent Organization (EAPO) (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM) European Patent Office (EPO) (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE) African Intellectual Property Organization (OAPI) (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG). | ||||||||||||||||||
| Publication Language: | English (EN) |
| Filing Language: | English (EN) |
