Abstract
A comparative analysis of carbon dioxide emissions during the burning of Portland cement clinker, lime and gypsum was performed. The interrelation between energy indices and the emission of carbon dioxide is shown. The quantitative indices of atmospheric pollution in the manufacture of binders are given. Ecological expediency of production of gypsum and cement clinker in comparison with lime is shown. The article is made rough calculation of environmental pollution by carbon dioxide, which is produced and released into the atmosphere during the production of building binders. It was determined the directions of reducing the formation of gases during firing of the substances to reduce environmental pollution: decrease in endothermy of chemical transformations; reduction of the content of calcium and magnesium carbonates in the feedstock mixture; reduction of raw material moisture; reduction of fuel consumption for the process; increasing the technological efficiency of the process. It was determined the directions of reducing the formation of gases during firing of the substances to reduce environmental pollution. It is shown that carbon dioxide is released into the Earth’s atmosphere in the amount of more than three billion metric tons per year by enterprises that produce cement, lime, and gypsum.
Highlights
Environmental protection issues are addressed from industrial emissions, most often through the use of gas cleaning and dust removal technologies designed to reduce toxic emissions through their utilization or capture
In the formula, the first term shows the evolution of gases as a result of fuel combustion, the second - the release of carbon dioxide in the decomposition of carbonates, the third - the release of water vapour from the raw materials, the fourth - the liberation of hydrated moisture from aluminosilicates and calcium sulfate dihydrate
It is possible to determine the directions of reducing the formation of gases during firing of the substances to reduce environmental pollution: - decrease in endothermy of chemical transformations; - reduction of the content of calcium and magnesium carbonates in the feedstock mixture; - reduction of raw material moisture; - reduction of fuel consumption for the process; - increasing the technological efficiency of the process
Summary
Environmental protection issues are addressed from industrial emissions, most often through the use of gas cleaning and dust removal technologies designed to reduce toxic emissions through their utilization or capture. Reducing the content of calcium carbonate and magnesium carbonate in the raw material mixture at the clinker firing is one way to reduce carbon dioxide emissions into the atmosphere.
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