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V. A. Lipin, D. A. Trufanov (2019) EFFECT OF CHALK THERMAL TREATMENT MODE ON ITS STRENGTH. Journal of Mining Institute. Vol 236. p. 210. DOI: 10.31897/pmi.2019.2.210
LipinV. A., & TrufanovD. A. (2019). EFFECT OF CHALK THERMAL TREATMENT MODE ON ITS STRENGTH. Journal of Mining Institute, 236, 210. https://doi.org/10.31897/pmi.2019.2.210

EFFECT OF CHALK THERMAL TREATMENT MODE ON ITS STRENGTH

Authors:
V. A. Lipin1
D. A. Trufanov2
  • 1 — Saint-Petersburg State University of Industrial Technologies and Design
  • 2 — LLC AMC «Explorer»
Date submitted:
2017-12-08
Date published:
2019-04-25

Abstract

Natural chalk is characterized by a fine-grained structure. The processing of chalk in conditions traditional for calcium carbonate baking is accompanied by its almost destruction and the formation of a huge amount of dust. The paper presents strength characteristics of chalk and chalky stone baking obtained with different temperature-time conditions of heating the raw material to a temperature of 450-600 °C. The uniaxial compression method was used to determine the strength depending on variable factors. Based on the experimental data, a model was constructed that determines the dependence of chalk strength on time and heating temperature. In the temperature range of 450-600 °C, the strength of chalk stone increases with increasing temperature and decreases with the increasing heating rate. In the process of isothermal heating, several factors will immediately affect the strength of a chalky stone: the formation and growth of calcite crystals, the evaporation of water, and the agglomeration of calcite grains. With an increase in the heating temperature from 450 to 600 °C, the average size of the crystals significantly increases and crystals with an estimated size of more than 4 microns are detected. An increase in the size of crystals is associated with an increase in their growth rate. The agglomeration of grains occurs at a temperature of 600 °C.

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