江西某砂质高岭土超导磁分离除铁增白试验研究

Study on Iron Removal and Whitening of Sandy Kaolin from Jiangxi by Superconducting Magnetic Separation

为研究精制高岭土的绿色环保制备技术,以江西某砂质高岭土为研究对象,进行了工艺矿物学和超导磁分离除铁增白试验研究。主要研究了不同磁选方式、超导磁选中磁场强度、分散剂用量、进料速度、分选介质尺寸、电磁预处理等对高岭土磁选的影响。最终确定采用"电磁预选—超导磁选"工艺,电磁磁场强度为1.1 T,超导磁场强度为4 T,且在分散剂用量为0.4%、进料速度为0.8 cm/s、使用2#钢毛的超导磁选条件下,获得Fe_2O_3含量为0.48%、白度为93.4%、产率为60.08%的精制高岭土,极大地提高了该砂质高岭土的产品附加值。

In order to study the green preparation technology of refined kaolin, taking sandy kaolin from Jiangxi as a research object, process mineralogy, iron removal and whitening by superconducting magnetic separation were studied. Different magnetic separation, magnetic intensity, dispersant dosage, feed rate, media size and pretreatment were mainly studied. Finally,“pre-electromagnetic separation - superconducing magnetic separation” was adopted. The refined kaolin with Fe 2O 3 content of 0.48%, whiteness of 93.4%, and yield of 60.08% was obtained, while the intensity of electromagnetic separation and superconcucing magnetic separation were 1.1 T and 4 T, respectively, and under the superconducing magnetic separation condition of dispersant dosage of 0.4%, feed rate of 0.8 cm/s, and 2# steel wool. This method has greatly improved the additional value of sandy kaolin.