Based on the composition characteristics of carbide slag and the application of polyvinyl chloride, a method of preparing calcium carbonate with microstructure and nanostructure by using carbide slag as a raw material and ammonium chloride as a leaching agent was proposed. The factors for the preparation of calcium carbonate and the effects of different conditions on the crystal phase, grain size, and morphology of calcium carbonate were systematically studied. The results showed that the nanosized calcium carbonate was prepared at 60 mL/min, 25 °C, no additional ammonia, and 60 min. The product of spherical vaterite was in accordance with the relevant standards for the industrial precipitation of calcium carbonate. Moreover, the reuse of carbonation filtrate was realized. The crystal phase, grain size, and morphology of the carbonation product could be controlled by adjusting the reaction conditions. The manuscript provided a new idea for resource utilization of carbide slag and preparing nanocalcium carbonate.

中文翻译：

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利用可回收氯化铵从电石渣制备微纳结构碳酸钙用于封存CO2

基于电石渣的成分特点和聚氯乙烯的应用，提出了一种以电石渣为原料、氯化铵为浸出剂制备微结构和纳米结构碳酸钙的方法。系统研究了碳酸钙的制备因素以及不同条件对碳酸钙晶相、晶粒尺寸和形貌的影响。结果表明，纳米碳酸钙在60 mL/min、25℃、不添加氨水、60 min 的条件下制备。产品为球形球霰石，符合工业沉淀碳酸钙相关标准。并且实现了碳酸化滤液的重复利用。通过调节反应条件可以控制碳化产物的晶相、晶粒尺寸和形貌。该论文为电石渣资源化利用和制备纳米碳酸钙提供了新思路。