Preparation of wollastonite from zeolite-containing rock by solid-phase synthesis
https://doi.org/10.20914/2310-1202-2023-4-145-151
Abstract
The Tatarsko-Shatrashan zeolite-containing deposit, located in the southwest of the Republic of Tatarstan, contains a large amount of calcite (10-50%) of the total mass of the rock, as well as other minerals – zeolite, opal-cristoballite-tridymite. Such a composition requires an expensive zeolite enrichment process, which significantly affects the cost of the final product. The work proposes the use of zeolite-containing rock for the synthesis of calcium silicates, in particular wollastonite. Calcite – limestone flour (dolomite) was used as a Ca-containing source material in this work; zeolite-containing siliceous rock of the Tatarsko-Shatrashan deposit was used as a silicon-containing material, which also includes a source of calcium in the form of calcite (up to 40%). The solid-phase synthesis process was carried out in a SNOL 1100/7.2 muffle furnace at temperatures of 900 and 1100°C, raising to a given temperature was carried out at a rate of 5 °C/min, holding time was 3 hours. The starting components were mixed in stoichiometric ratios CaO:SiO2=0.7-1.1. The work used a generally accepted method for identifying synthesis products – X-ray quantitative analysis. It has been shown that with a CaO:SiO2 ratio in the range of 0.8-0.9 and isothermal exposure for 3 hours at a temperature of 1100 °C, the highest yield of wollastonite is observed – 67-79%. The morphology of calcium silicate was studied using scanning electron microscopy. The resulting calcium silicate can be characterized as a low aspect ratio sintered product with a shape similar to tabular structures. Wollastonite of this form can be used in the ceramic industry as an effective additive that improves the drying characteristics of ceramic masses.
About the Authors
K. A. Mishagin
All-Russian Scientific Research Institute of Aviation Materials NRC “Kurchatov Institute”
1st category engineer, laboratory 620, Radio str., 17 Moscow, 105005, Russia
E. S. Yamaleeva
Kazan National Research Technological University
Cand. Sci. (Engin.), associate professor, medical engineering department, Karl Marx Av., 68 Kazan, 420015, Russia
E. M. Gotlib
Kazan National Research Technological University
Dr. Sci. (Engin.), professor, synthetic rubber technology department, Karl Marx Av., 68 Kazan, 420015, Russia
A. I. Khatsrinov
Kazan National Research Technological University
Dr. Sci. (Engin.), head of department, technology of inorganic substances and materials department, Karl Marx Av., 68 Kazan, 420015, Russia
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Review
For citations:
Mishagin K.A., Yamaleeva E.S., Gotlib E.M., Khatsrinov A.I. Preparation of wollastonite from zeolite-containing rock by solid-phase synthesis. Proceedings of the Voronezh State University of Engineering Technologies. 2023;85(4):145-151. (In Russ.) https://doi.org/10.20914/2310-1202-2023-4-145-151
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