Invention Grant
US09150738B2 Process for the production of precipitated calcium carbonate, precipitated calcium carbonate and uses thereof 有权
制备沉淀碳酸钙,沉淀碳酸钙的方法及其用途

Process for the production of precipitated calcium carbonate, precipitated calcium carbonate and uses thereof
Abstract:
The present invention relates to a process for the production of precipitated calcium carbonate, comprising the following steps: a) providing a reaction vessel containing an aqueous phase at an initial temperature; b) injecting a carbon dioxide generating compound into the aqueous phase until the pH of the aqueous phase is in the range of around 5 to around 7; and c) subsequently adding a calcium hydroxide slurry at an initial temperature to the reaction vessel while continuing the injection of the carbon dioxide generating compound, in order to obtain an aqueous slurry of the precipitated calcium carbonate. The addition rate of the calcium hydroxide slurry to the reaction vessel in step c) is such that an average electrical conductivity of the reaction contents in the reaction vessel during the reaction is in a range of 100 to 6 000 μS/cm.
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