In the chemical leaching method, the acid type, concentration, leaching temperature and time are all important parameters. For example, different acids such as sulfuric acid, hydrochloric acid and oxalic acid have different effect in iron removal and their effect on kaolin, so it is necessary to choose the appropriate acid and concentration according to the nature of kaolin and the occurrence state of iron. Improper control of leaching temperature and time may lead to incomplete iron removal by PTMS magnetic separation or damage to the lattice structure of kaolin.
In chemical bleaching PTMS magnetic separation method, acidity, temperature, reaction time, pharmaceutical dosage must be strictly controlled, because like insurance powder bleach easy to decompose and reduce its reduction ability, and after bleaching kaolin cannot timely washing, the product will return yellow, need by adding the right amount of chelating agent to improve the stability of the product, such as oxalic acid, citric acid, polyphosphate, ethylenediamine acetate, EDTA, etc.
Four stage series PTMS magnetic separation process with a diameter of 150,75,50 and 10mm was used to purify the kaolin, and sodium hexadylhate was used as dispersagent. Through this re-density process, some high density particles containing impurities such as iron can be removed.
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