Abstract
To provide the quality required for its use, raw kaolin must be subjected to certain processing procedures like delamination which is applied to the layered structure materials. The aim of this research is to determine the possibility of performing delamination in the extruder and to estimate the effects of this process on the physico-chemical properties of kaolin. The results showed that delamination can be efficiently realized in the extruder by shearing densely packed layers under the influence of friction force and added Na2CO3 electrolyte. The crystal structure of the system was thus disrupted. This was confirmed by the Hinckley index (HI) decrease and by the dilatometric characteristics changes during heating. The particle size was reduced and, furthermore, new adsorption centers were formed, which led to an increase in the total cation exchange capacity (CEC). The plasticity of kaolin decreased with the increasing delamination degree, as well as the amount of water required for plastic processing, which is favorable in drying ceramic products.
Highlights
IntroductionClay is plastic semi-bound sediment formed by diagenesis (binding) of sludge-pelitic material (particle size below 0.005 mm) transported by water and precipitated in an aqueous environment
Clay is plastic semi-bound sediment formed by diagenesis of sludge-pelitic material transported by water and precipitated in an aqueous environment
Chemical analysis of the initial kaolin sample (Table I) exhibited that oxides of Si and Al were predominant in kaolin with a content of 48.24 % and 33.93 %, respectively
Summary
Clay is plastic semi-bound sediment formed by diagenesis (binding) of sludge-pelitic material (particle size below 0.005 mm) transported by water and precipitated in an aqueous environment. Residual or sedimentary clays were formed and remained at the place of the primary material decomposition [1]. The composition of clay includes minerals that represent a large group of similar silicates. Among the silicates that are determined as clays, the most important crystalline representatives belonging to phyllosilicates are kaolinite, pyrophyllite, montmorillonite, illite, halloysite as well as amorphous allophane. Clay minerals are usually found in aggregates with one of them dominating. Kaolinite clays are dominated by the mineral kaolinite
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
