Comparison of the physicochemical properties and mineralogy of Chinese (Beihai) and Brazilian kaolin
Source abstract
Abstract
Abstract Beihai area (China) has about 500 million tons kaolin reserves with potential applications in ceramics, paint, plastic and rubber-filler industries, but unlike the Brazilian kaolin, it is not good in paper-coating industry. In order to understand the differences between Chinese (Beihai) and Brazilian kaolin, their individual physicochemical properties, morphologies, crystal structures, and surface characteristics were systematically investigated and compared. The results showed that the viscosity concentration, specific surface area and zeta potential of Brazilian kaolin were higher than those of Beihai kaolin. SEM and TEM images revealed that Brazilian kaolin had more regular particle shape, smoother surface and larger diameter–thickness ratio than those of Beihai kaolin. Moreover, XRD and TG/DSC analyses exhibited that Beihai kaolin was low ordered kaolinite with lower value of Hinckley index, average flake thickness along c -axis and endothermic peak temperature as compared to Brazilian kaolin. Furthermore, the crystal structures refined by the Rietveld method of Beihai kaolin showed a greater distortion of [SiO 4 ] tetrahedron than that of Brazilian kaolin. It can be concluded that low viscosity concentration, low degree of order, and irregular particle shape of Chinese (Beihai) kaolin are the reasons why it is not suitable for use in the paper-coating industry.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Clay minerals and soil interactions · Soil and Unsaturated Flow · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (22)
Show source-provided references
1. Stability of kaolinite dispersions in the presence of sodium and aluminum ions10.1016/j.clay.2010.10.023 ↗
2. What is the structure of kaolinite? Reconciling theory and experiment10.1021/jp810448t ↗
3. Characterization and evaluation of Algaof Kaolin deposits of Yemen for industrial application10.3844/ajeassp.2009.292.296 ↗
4. Engineered clay products for the paper industry10.1016/j.clay.2004.12.005 ↗
5. GB/T14563-2008, Specification and Test Method of Kaolin Clay, State Standard of the People's Republic of China (In Chinese).
6. Application of urea-intercalated kaolinite for paper coating10.1016/j.clay.2011.11.001 ↗
7. Kaolin in paper filling and coating10.1016/0169-1317(91)90015-2 ↗
8. The importance of crystal morphology on the viscosity of concentrated suspensions of kaolins10.1016/S0169-1317(97)00006-9 ↗
9. Experimental study on reducing the viscosity of paper coating kaolin
10. Characterization of kaolin from the Capim River region-Brazil10.1016/j.clay.2011.11.009 ↗
11. Bentonite slurries-zeta potential, yield stress, adsorbed additive and time-dependent behaviour10.1007/s00397-010-0498-x ↗
12. Particle interactions in kaolinite suspensions and corresponding aggregate structures10.1016/j.jcis.2011.03.043 ↗
13. Insight into the physicochemical aspects of kaolins with different morphologies10.1016/j.clay.2012.10.003 ↗
14. Variability in "crystallinity" values among the kaolin deposits of the coastal plain of Georgia and South Carolina10.1346/CCMN.1962.0110122 ↗
15. Effect of surface structure of kaolinite on aggregation, settling rate, and bed density10.1021/la100088n ↗
16. Effect of the crystallinity of kaolinite precursors on the properties of mesoporous silicas10.1016/j.clay.2007.09.009 ↗
17. A study of order degree in the structure of kaolinite by X-ray diffraction
18. Low temperature hydrothermal synthesis and characterization of Mn doped cobalt ferrite nanoparticles10.1016/j.ceramint.2012.01.001 ↗
19. New X-ray rietveld refinement of kaolinite from Keokuk, Iowa10.1002/crat.2170250120 ↗
20. Rheological and zeta potential behaviour of kaolin and bentonite composite slurries10.1016/j.colsurfa.2013.06.039 ↗
21. Role of macromolecules in kaolinite flotation10.1016/j.mineng.2004.04.012 ↗
22. Modification of surface charge properties during kaolinite to halloysite-7Å transformation10.1006/jcis.1998.5917 ↗