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Singh, S.K.
- Critical Analysis of Indian Soda Lime: Scope of Improvement
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Authors
Archana Kumari
1,
K.K. K. Singh
1,
K. K. Mishra
1,
A. Kumar
1,
R.K. Tiwary
1,
S.K. Singh
1,
R. S. Singh
1
Affiliations
1 CSIR- Central Institute of Mining and Fuel Research, Barwa Road Dhanbad, Jharkhand 826001, IN
1 CSIR- Central Institute of Mining and Fuel Research, Barwa Road Dhanbad, Jharkhand 826001, IN
Source
Journal of Mines, Metals and Fuels, Vol 68, No 5 (2020), Pagination: 158-165Abstract
Soda lime is one of the most popular carbon dioxide absorbent materials to be used for closed-circuit life saving safety breathing apparatus in mining industries. A trained rescue person uses it during a situation such as a fire, explosion or emission of toxic gasses in underground mines. This paper evaluates the chemical composition and physical properties of soda lime using specific parameters (moisture, carbon dioxide gas absorption, granule shape and fine particle size) which plays an important role in its application in breathing apparatus. Results indicated that soda lime moisture content, fine grains and hardness ranged between 11.6-18.3%, 0.2-1.9g, and 70-90%, respectively. The CO2 absorption rate was observed to be 20.0 to 57.0 minutes compared to standard UK Protosorb soda lime CO2 (135 minutes). X-Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Scanning Electron Microscope (SEM) analysis of the samples were carried out to understand the changes in molecular structure of the material before and after CO2 absorption. The XRD result indicated presence of portlandite (48.5%),calcite (49.6%) and potassium rhenium sulfide telluride cyan acetate (PRSTCA) (1.84%) before CO2 absorption and calcite/ calcium carbonate (89.4%) portlandite (3.38%) and octasodium d-potassium tetra hydrogen dihydroxo tetra telluride dipalladate (7.2%), 20-hydrate was observed after CO2 absorption. EDS of sample 6 indicated presence of carbon (4.94%), oxygen (39.80%) sodium (3.36%) and calcium (51.90%) before CO2 absorption and carbon (6.27%), oxygen (36 96%), sodium (1.37%) and calcium (55.40%) after CO2 absorption.Keywords
Carbon Dioxide (CO2), Soda Lime, Hot Air Oven, Breathing Apparatus, XRD, EDS, SEM.
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