以菱镁矿（主要成分为MgCO3，含少量SiO2、Fe2O3和Al2O3）为原料制备高纯镁砂的工艺流程如图：
已知浸出时产生的废渣中有SiO2、Fe（OH）3 和Al（OH）3．下列说法错误的是（ ）
A．浸出镁的反应为MgO+2NH4Cl═MgCl2+2NH3↑+H2O
B．浸出和沉镁的操作均应在较高温度下进行
C．流程中可循环使用的物质有NH3、NH4Cl
D．分离Mg2+与Al3+、Fe3+是利用了它们氢氧化物Ksp的不同
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