Study on the activation of calcium montmorillonite (Ca-MMT) by sodium cations

The results of spectral research (IR, UV-Vis) of activation process of calcium montmorillonite Ca-MMT by sodium cations are presented in this article. Modifications Ca-MMT were carried out by modifier in the form of sodium carbonate by keeping different times of activations. On the base of received sodium modifiers MMT (Na-MMT) analytical cycle of research was done, including structural (IR) and spectrophotometric (UV-Vis) researches, in order for designation of ions exchange ability (CEC). There was observed that the method of processing modification (changing activation time) does not affect on ion exchange ability Na-MMT. Application of modified MMT used as a binding material in greensand will be described in next part of planned researches

DETECTION OF NITRATES(V) AND SULFATES(VI) BY UV-VIS SPECTROPHOTOMETRY METHOD IN USED GREEN SAND BONDED BY BENTONITE WITH MODIFIED STARCH ADDITION

The research results (SEM, UV-Vis) that contain a part of the work connected with determining the influence of a modified starch addition on the physical and chemical property changes of green sands (including the emission levels of harmful substances from the used molding sands formed as a result of the liquid metal pouring of molds) are presented in this paper. A surface analysis (SEM) was performed for the fresh molding sands and used molding sands with and without modified starch samples. On the bases of the received microscopic images, the impact of the temperature factor on the morphology of the molding sand samples after the liquid metal pouring process are assessed. In the second part of the performed work on the UV-Vis research, eluates from two used molding sands (green sand [sand number 1] and green sand with the addition of a modified starch [sand number 2]) were tested for nitrate and sulfate content. In order to determine whether the level of nitrate and sulfate elusion from the used molding sands is permissible, the received results were compared with the Minister of Environment’s regulations concerning the requirements of surface waters used for supplying the population with potable water

TG-DTG-DSC, FTIR, DRIFT and Py-GC-MS studies of thermal decomposition for poly(sodium acrylate)/dextrin (PAANa/D) – new binder BioCo3

TG-DTG-DSC, FTIR, DRIFT, and Py-GC-MS studies have been conducted to determine the effect of the thermal decompositionconditions and structure of foundry binder BioCo3 in the form of a composition poly(sodium acrylate)/dextrin(PAANa/D) on the progress of degradation in terms of processes occurring in foundry sands in contact with liquid metal.TG-DTG-DSC curves of the composition allowed us to determine the temperature range in which they do not undergodegradation, by which they do not lose their binding properties. With temperature increasing, physical and chemicalchanges occur that are related to the evaporation of solvent water (20–110°C), followed by the release of constitutionwater, and finally intermolecular dehydration (110–230°C). In this temperature range, processes that are mainly reversibletake place. Within a temperature range of 450–826°C, polymer chains are decomposed, including the decompositionof side chains. Within a temperature range of 399–663°C, polymer composition decomposition can be observed (FTIR,DRIFT), and gas products are generated from this destruction (Py-GC-MS)