采用X射线衍射分析(XRD)方法分析表明,富硼渣中的硼组分主要以Mg2B2O5形式存在,而钠化渣中的硼组分以Na4B2O5和NaBO2晶相形式析出.为提取富硼渣中的硼,考察了热处理温度、碳酸钠加入量、热处理时间、水浸温度等因素对钠化渣中硼浸出率的影响.同时考察了富硼渣中w(Al2O3)、w(CaO)、w(B2O3)、m(MgO)/m(SiO2)4个单因素变化对钠化渣中硼浸出率的影响.结果表明,组成为w(Al2O3)5%、w(CaO)1%、w(B2O3)18%、m(MgO)/m(SiO2)2.0的富硼渣,在热处理温度为650℃,碳酸钠加入量为2.3倍,热处理时间为4.5h,水浸温度为180℃的条件下,钠化渣中硼的一次浸出率可达85.01%.
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