发明名称 |
PRODUCTION OF CALCIUM CARBONATE |
摘要 |
A method of producing calcium carbonate from lime comprises the steps of: (i) providing an aqueous solution comprising 10% to 35% by weight of dissolved polyhydroxy compound and 1% to 5% by weight of dissolved calcium hydroxide (expressed as Ca(OH)2) and having a pH of at least 11.5; (ii) treating the solution prepared in step (i) to remove solids including suspended solids; (iii) dispersing carbon dioxide through the solution so as to form calcium carbonate with a consequential reduction in the pH of the reaction mixture, (iv) during a time period beginning at the start of a sudden, short rise in pH and ended during a subsequent fall in pH but before it reaches 9.5 terminating the dispersion of carbon dioxide and adding an alkaline reagent to maintain a pH for the product mixture of at least 9.5, and (v) recovering precipitated calcium carbonate. |
申请公布号 |
HK1174018(A1) |
申请公布日期 |
2014.05.23 |
申请号 |
HK20130101278 |
申请日期 |
2013.01.30 |
申请人 |
CALCITECH SYNTHETIC MINERALS LTD. |
发明人 |
JENSEN, CHRISTOPH;MARKWARDT, ILKA |
分类号 |
C01F |
主分类号 |
C01F |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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