Improvement of sintering properties of halloysit-kaolinite mixture low quality ceramic raw material by mechanical dispersion and wet magnetic separation

Durgut E., Çinar M., Terzi M., Kurşun Ünver I., Yıldırım Y., Boylu F., ...Daha Fazla

17th International Mineral Processing Symposium (IMPS 2022), İstanbul, Türkiye, 15 - 17 Aralık 2022, cilt.1, ss.285-290, (Tam Metin Bildiri)

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 1
  • Basıldığı Şehir: İstanbul
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.285-290
  • İstanbul Üniversitesi-Cerrahpaşa Adresli: Evet

Özet

As in all sectors, there should be no disruptions in the supply chains to ensure the continuity of the need for quality kaolin group of clay minerals and production safety, which the ceramics industry needs. Therefore, countries turn to domestic raw material resources to meet the raw material needs of their sectors and conduct research for necessary improvements. In this study, in order to improve the sintering properties of a low-quality clay ore containing halloysite and kaolinite, it was aimed to obtain a low iron content product by reducing the high iron (3.9%) content of the ore by removing iron and titanium minerals with mechanical dispersion and wet magnetic separation processes to use in the ceramic industry.

 

XRD analysis revealed that the ore contained halloysite, kaolinite, and quartz minerals with diamagnetic properties, and goethite gangue minerals with paramagnetic properties. In this context, first of all, the ore suspension prepared at 35% pulp in solids ratio was mixed using a pilot scale mixer by adding 7.5 kg/ton sodium hexametaphosphate (SHMP), and then wet screened from a 212 µm sieve to remove iron-containing minerals that did not disperse and remained in coarse size fraction. As a result of mechanical dispersion and wet sieving, a product with a size of +212 µm with 26.4% Al2O3, 50.8% SiO2 and 9.6% Fe2O3 content was obtained, while at -212 µm size a product with 31.3% Al2O3, 59.0% SiO2 and 3.2% Fe2O3 containing a product was obtained.

 

Then, this sample was subjected to wet magnetic separation at 5750 Gauss magnetic field intensity with a wet high-intensity magnetic separator. The Al2O3, SiO2 and Fe2O3 contents of the nonmagnetic product were found to be 31.7%, 51.5% and 2.3%, respectively. Fe2O3 removal efficiency was 30.2% for 5750 Gauss. Additionally, shrinkage/water absorption and L-a-b color values ​​in sintering studies with nonmagnetic products were measured as 8.3% / 12.7% and 74.0-7.2-12.9, respectively, in wall tile conditions.

 

As a result, it was observed that the mechanical dispersion and wet magnetic separation process provide significant improvements in the color values ​​of the material under wall tile sintering conditions.