目睹粗液SiO_2浓度比国外高出一倍的实况,对我国烧结法生产流程中硅的行迹进行了剖析,得出二氧化硅在现行生产流程中的循环量高达14.1％,由此抬高了生产加工费近30元/吨Al_2O_3。添加Na_2CO_3溶出熟料是SiO_2在流程中循环,重复加工的原因之一,指出以NaOH替代Na_2CO_3溶出熟料,可减少粗液SiO_2浓度。 Witnessing the fact that the concentration of SiO 2 in crude liquid is twice as high as that of foreign countries, the trace of silicon in the sintering process of our country is analyzed. The result shows that the circulation of silica in the current production process is as high as 14.1% Production and processing costs nearly 30 yuan / ton Al_2O_3. Adding Na_2CO_3 dissolution clinker is one of the reasons that SiO_2 circulates in the process and repeats processing. It is pointed out that using NaOH instead of Na_2CO_3 to dissolve clinker can reduce the concentration of SiO_2 in the crude liquid.