How to remove iron from kaolin
May.13,2023
Whiteness is the main parameter affecting kaolin process performance, the higher the whiteness, the higher the purity, the higher its use value. Natural kaolin often reduces the whiteness due to impurities. The substances that affect the whiteness of minerals in kaolin are mainly organic matter, iron, titanium-containing ore and dark minerals.
Why should kaolin remove iron
Iron is the main substance that affects the whiteness of kaolin. Iron-containing minerals will turn into Fe2O3 when calcined at high temperature, causing the raw materials to turn yellow or brick red. These coloring impurities usually have weak magnetic properties and can be removed by strong magnetic separation.
Magnetic Separation Iron Removal Process
Through the high-gradient magnetic separator, the Fe2O3 content in the concentrate is reduced from 1.33% to 1.04%, the iron removal rate is 21.80%, the K2O content is reduced from 1.68% to 1.27%, and a large amount of mica and other impurity minerals in kaolin are removed;
The content of Fe2O3 in the concentrate after reduction bleaching was reduced from 1.33% to 1.07%, and the iron removal rate was 19.55%, which reduced the content of iron impurities; 0.95%, the iron removal rate is 28.57%, the K20 content is reduced from 1.68% to 1.29%, and the calcined whiteness is increased from 76.53% to 84.00%. The product meets the secondary standard (TC-2) for ceramic industry.
