Reclaiming Ability of Spent Sands with Modified, Hydrated Sodium Silicate

Journal title

Archives of Foundry Engineering




No 1

Publication authors


Loose self-hardening moulding sands ; Floster S process ; Modification of sodium silicate ; Reclamation

Divisions of PAS

Nauki Techniczne


Archives of Foundry Engineering continues the publishing activity started by Foundry Commission of the Polish Academy of Sciences (PAN) in Katowice in 1978. The initiator of it was the first Chairman Professor Dr Eng. Wacław Sakwa – Corresponding Member of PAN, Honorary Doctor of Czestochowa University of Technology and Silesian University of Technology. This periodical first name was „Solidification of Metals and Alloys” , and made possible to publish the results of works achieved in the field of the Basic Problems Research Cooperation. The subject of publications was related to the title of the periodical and concerned widely understand problems of metals and alloys crystallization in a casting mold. In 1978-2000 the 44 issues have been published. Since 2001 the Foundry Commission has had patronage of the annually published “Archives of Foundry” and since 2007 quarterly published “Archives of Foundry Engineering”. Thematic scope includes scientific issues of foundry industry:

  • Theoretical Aspects of Casting Processes,
  • Innovative Foundry Technologies and Materials,
  • Foundry Processes Computer Aiding,
  • Mechanization, Automation and Robotics in Foundry,
  • Transport Systems in Foundry,
  • Castings Quality Management,
  • Environmental Protection.


The presented in the paper investigations were aimed at the determination of the reclaimed material (obtained in the dry mechanical

reclamation process) addition influence on properties of moulding sands with hydrated sodium silicate modified by colloidal suspension

of zinc oxide nanoparticles in propanol. Nanoparticles originated from the thermal decomposition of alkaline zinc carbonate, were used.

The results of the reclamation of the spent moulding sand with hydrated sodium silicate performed in the AT-2 testing reclaimer are

presented in the paper. Both, spent sands from the Floster S technology and from the technology with the modified water-glass were

subjected to the reclamation processes. The following determinations of the reclaimed material were performed: pH reaction, acid demand,

ignition loss and Na2O content. The obtained reclaim was used as a matrix component of moulding sands with water-glass in the Floster S

technology, in which it constituted 60% and 50% of the sand matrix. The strength properties of the prepared moulding sands were

determined (bending strength Rg


, tensile strength Rm


) after samples storing times: 1h, 2h, 4h and 24 hours.


The Katowice Branch of the Polish Academy of Sciences




Artykuły / Articles


ISSN 2299-2944