PRODUCTION OF CALCIUM CARBONATE
    10.
    发明申请
    PRODUCTION OF CALCIUM CARBONATE 有权
    生产碳酸钙

    公开(公告)号:US20120189515A1

    公开(公告)日:2012-07-26

    申请号:US13437212

    申请日:2012-04-02

    Abstract: 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.

    Abstract translation: 从石灰生产碳酸钙的方法包括以下步骤:(i)提供包含10重量%至35重量%的溶解的多羟基化合物和1重量%至5重量%的溶解氢氧化钙的水溶液(表示为Ca(OH )2),pH为至少11.5; (ii)处理步骤(i)中制备的溶液以除去包括悬浮固体的固体; (iii)将二氧化碳分散在溶液中以形成碳酸钙,从而导致反应混合物的pH值降低;(iv)在pH突然短暂升高开始的时间段内,在 随后pH值下降,但在达到9.5之前终止二氧化碳的分散,并加入碱性试剂以保持产物混合物的pH至少为9.5,(v)回收沉淀的碳酸钙。

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