Abstract
As a kind of fundamental industrial material, calcium carbonates have been widely used in the area of metallurgy, plastics, food and pharmaceutical industry. This study introduces a prototype for the preparation of mono dispersed calcite by using carbide slag as raw material. It was found that the leaching rate of the slag could be significantly increased with help of the coordination effect of citrate anions to calcium cations. Calcium carbonate precipitates are prepared by the carbonation of the leachate, in which citrate anion also displays a strong surface effect during the crystallization process of calcium carbonate nanocrystals. Moreover, it reveals that the terminal pH condition of the carbonated leachate is another key controlling factor, not only for the polymorphs and morphologies of calcium carbonates, but for the recycling of the leachate. If the terminal pH was set to be 11, the homogeneous calcite micro/nanorods crystals could be successfully obtained, simultaneously the citrate solution could be reused in the second leaching. Lower terminal pH will lead to the increase of carbonate anions concentration and in turn the decrease of leaching rate of calcium cations. The way demonstrated here provides a valuable prototype for the high-value reutilization of the Ca-containing industrial solid waste.
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