CrimeaPRESS reports:
Scientists of the Crimean Federal University named after V.I. Vernadsky developed strong and durable construction products based on slag from metallurgical enterprises and man-made carbon dioxide. This was announced by the Vice-Rector for Scientific Activities, Professor of the Department of Construction Engineering and Materials Science at the Institute of the Academy of Construction and Architecture of KFU. IN AND. Vernadsky Nikolai Lyubomirsky.
The goal of our project is to develop technologies for producing building materials from metallurgical waste, the main component of which would be carbon dioxide of anthropogenic origin, that is, the gas that we emit into the atmosphere, thereby clogging it. At the first stage, we examined the slags themselves. In the Russian Federation, the amount of accumulated solid slag exceeds 500 million tons. These are blast furnace slags, steelmaking slags, ferroalloy slags, non-ferrous metal slags, etc. All of them require processing, since they occupy and litter large areas of land.– quotes the press service of the university Nikolai Lyubomirsky.
As part of the project, university specialists examined 12 slag samples taken from five enterprises in the Central and Northwestern federal districts of the Russian Federation. As a result, scientists identified the optimal raw materials, developed technological parameters for its processing and technology for the production of building materials.
As a result, we received paving slabs that do not contain a single gram of specially produced raw materials, that is, no cement, no other binding materials. It consists of 100% waste: slag and carbon dioxide. The strength of the tile reaches thousands of kilograms per square centimeter. For cement concrete this is an almost prohibitive value. We have also developed a brick whose properties are similar to clinker bricks — the most durable brick of all known. Waste from the Crimean soda plant was also used to produce bricks. Such unique properties are achieved through artificial carbonization. Due to the fact that slags are formed at very high temperatures, a number of minerals are synthesized in their composition that can enter into a chemical reaction with carbon dioxide, forming strong and water-insoluble compounds. Our task as scientists was to develop optimal process conditions to increase the reactivity of these minerals and make them available for carbonation reactions. Due to the fact that mainly calcite is formed in the material, which during its formation exhibits astringent properties, that is, it binds the particles of the material together into a single strong conglomerate, we call it “calcite cement”. We classify the products obtained in this way as high-strength,” notes Nikolai Lyubomirsky.
According to him, in addition to strength, the resulting products have increased durability, and their guaranteed frost resistance is 200 cycles of freezing and thawing. Despite the fact that calcite is formed in the products, they are resistant to acids and temperature changes. At the same time, the cost of these products is several times lower than cement-based materials due to the low cost of slag as industrial waste.
In addition, as part of the project, based on the technological parameters for the production of forced carbonate hardening building products developed by specialists from the Crimean Federal University, a carbonization chamber design was developed, which is now undergoing the patenting stage.
Today no one produces or uses such cameras. The carbonization chamber creates optimal conditions for hardening pre-formed building products. The hardening process occurs quite quickly. In just four hours we get a completely finished product that can be used in business.says Nikolai Lyubomirsky.
According to him, the next step will be the production of a factory chamber to test the process of manufacturing products not in a laboratory, but in an industrial environment.
source: KFU press service
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