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轻质碳酸钙广泛应用于橡胶、塑料、油漆、水性涂料以及造纸等行业，日常生活中的牙膏也常用它作摩擦剂。目前轻质碳酸钙的生产主要是碳化法，工艺流程见下图： 请分析轻质碳酸钙的生产流程，回答下列问题： （1）物质B的化学式为 ； （2）在A→B之间，过滤操作的目的是 ； （3）在B+C→CaCO 3 的过程中，应控制物质C的流量，原因是 （用化学方程式表示）； （4）生产轻质碳酸钙的方法很多请再设计一种制备方法 （用化学方程式表示）。
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