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Properties of Bentonites and Bentonite Mixtures used in Casting Processes

Paź S., Drożyński D., Górny M., Cukrowicz S.

Archives of Foundry Engineering

2019

iss. 2

35--40

In this work, an assessment and comparison of the quality of selected bentonites and bentonite mixtures was made. The samples consisted of available foundry materials used for bonding green sands. Determining the homogeneity degree and specific surface area of the grains allowed us to compare the examined materials and determine their influence on other parameters. On the basis of a thermal analysis of the bentonites or bentonite mixtures, the changes occurring in the sample during its heating were determined. Determining the potential for ion exchange and montmorillonite content enabled us to assess the binding properties of the materials. The preparation of six green sands with different bentonites or bentonite mixtures gave us the opportunity to assess the changes in apparent density, permeability, compressive strength and friability as a function of humidity, and the impact of different materials on the mentioned parameters. Their charts were analyzed, and the molding sand with the addition of bentonite or a bentonite mixture was selected for which these parameters are favorable. On this basis, the best-presented binding material was assessed and selected.

Odświeżanie mas formierskich z mieszankami bentonitowymi

Tomczyński S., Mitko M.

Archiwum Odlewnictwa

2004

R. 4, nr 11/2

270--275

W referacie przedstawiono wyniki badań masy obiegowej w Odlewni Żeliwa ZETKAMA oraz badań laboratoryjnych parametrów mas formierskich poddanych działaniu wysokich temperatur. Masy doświadczalne sporządzano z zastosowaniem trzech gatunków mieszanek bentonitowych. Stwierdzono zanik własności wiążących lepiszcza w wysokich temperaturach spowodowany szamotyzacją bentonitu. Wykazano korzystne własności mieszanki bentonitowo-kormixowej produkcji ZGM ,,Zębiec".

The paper presents the results of examination of circulating molding sand at ZETKAMA Cast Iron Foundry and the results of the laboratory examination of the parameters of molding sands subjected to the high temperature influence. The experimental sands have been prepared using three types of bentonite mixes. The loss of binding properties has been observed in high temperatures due to calcination process. Advantageous properties of the bentonite-kormix mix produced by ZGM ,,Zębiec" have been stated.