Deironing process for kaolin

Abstract

The invention discloses a deironing process for kaolin, belonging to the field of kaolin production. The deironing process comprises the following steps: 1, putting a kaolin filter cake into a sulfuric acid pool, and uniformly dispersing the kaolin filter cake; 2, introducing hydrogen peroxide, carrying out stirring for 5-10 minutes, and keeping the pH value of the solution in the sulfuric acid pool to be 1-2; 3, feeding barium thiocyanate into the sulfuric acid pool, wherein a ratio of barium thiocyanate to the kaolin filter cake in the step 1 is 1: (100-150), and carrying out standing for 5-10 min to obtain de-ironed ore pulp; 4, sampling the de-ironed ore pulp, carrying out filtering to obtain a kaolin-removed solution, and if the solution is red, introducing the de-ironed ore pulp in the step 2 into a sulfuric acid solution for replacement and washing and then cyclically repeating the step 3 and the step 4, or if the solution is transparent, carrying out step 5; 5, washing the de-ironed ore pulp obtained in the step 3 with clear water, and carrying out filter pressing to obtain a secondary kaolin filter cake; and 6, drying and pulverizing the secondary kaolin filter cake to obtain a finished kaolin product. The deironing process has the advantages that the iron content in the kaolin is reduced, the whiteness of the kaolin is improved, and the applicability of the process ishigh.

Description

technical field [0001] The invention relates to the field of kaolin production, more specifically, it relates to a kaolin iron removal process. Background technique [0002] Kaolin is a non-metallic mineral, a kind of clay and clay rock mainly composed of kaolinite clay minerals, and now it has become necessary for dozens of industries such as papermaking, ceramics, rubber, chemicals, coatings, medicine and national defense. Mineral raw materials. [0003] The quality of kaolin is generally evaluated by parameters such as whiteness, particle size, and plasticity. The whiteness is used as the main judgment parameter: generally, the more thoroughly the kaolin is bleached, the less iron content in the kaolin slurry, and the higher the whiteness of the kaolin due to the less colored iron oxide or ferrous oxide. The field is also wider. [0004] A Chinese invention patent with the notification number CN101798096B discloses a kaolin preparation method, including: mining and rem...

AI Technical Summary

Problems solved by technology

However, since the content of iron impurities in kaolin mines in various regions is very different, and the dissolution efficiency of iron impurities in acid solution is low, kaolin mines in different regions cannot be obtained after only 40-45 minutes of acidity. less kaolin, the whiteness of the kaolin prepared by the above preparation process cannot be guaranteed

[0006] Among them, after testing, the whiteness of kaolin prepared by Zhangzhou kaolin mine through the above preparation process is 50-60%, indicating that iron impurities in kaolin cannot be effectively removed

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