Normally Kaolin particles are finer than 10 microns which its processing using flotation can be difficult in some case. Is there any application of column flotation (reverse flotation) for processing of fine Kaolin in order to remove impurities?
in SE Germany two large companies operate open pit mines for kaolin. AKW (Amberg-Kaolin-Werke and Dorfner). Dorfner has a speical branch called Dorfner Anzaplan which is doing trail operations and test processing for different non-metallic commodities, among others kaolin. They should give you a piece of advice.
http://www.anzaplan.com/
I am dealing with kaolin deposits but only in the up-stream part, exploration and quality control of run-off mine kaolin using field-based methods.
Thank you for your comments which it is useful. I have already visited some Kaolin processing plants in eastern part of Germany (Saxony) but not the mentioned plant by you (Dorfner) however I believe almost of them handled the job via AKW.
there were peviously three companies working in that mining district, AKW, Kick and Dorfner. AKW and Kick now are under under the umbrella of "Quarzwerke". Currenly there are two separate companies working the same stratigraphic section of the lower Triassic Bunter series in the foreland of the "Naabgebirge". There are also some companies working on a different geological type of kaolin deposits in the Westerwald and Rheinland-Pfalz.. I will provide you with a selection of studies later, as it takes some time to sort them out for your special purpose.
To get a quick look at the mineral deposits in Central Europe I have attached the metallogenetic map of our study on mineral deposits in Central Europe. The map showing the mineral deposits of Germany, including all kaolin deposits you can dowload from "Researchgate Harald G. Dill". Should you have any problems with the download , let me know this and I send you a copy privately. Based upon these basic data you can make a selection for which sites you need more information as to kaolin and associated argillic deposits.