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Standards Development
This document specifies terms and definitions, principle, instrument and equipment, test procedures and test reports of immersion expansion ratio for steel slag. This document is applicable to the determination of immersion expansion ratio for converter slag and electric furnace slag. The determination range (percentage) is from 0.1% to 25%
In the context of carbon neutrality, steel industry not only provides steel products, but also produces a large number of by-products, and clean production and sustainable development face great challenges. Steel industry has high energy consumption, high emissions, large solid waste generated, and large carbon emission intensity. Reducing pollution and carbon is the only way for steel industry to achieve green and low-carbon development.1 ton of steel produces about 0.6 tons of industrial solid waste, including ferric dust, iron and steel slag. The realization of 100% utilization of solid waste in the steel industry is the top priority of sustainable development and cleaner production. Almost 100% of the Ferric dust can be recycled in the plant. The blast furnace slag can be used as cement and concrete admixture after water quenching, and the utilization rate is nearly 100%.However,the utilization of steel slag faced with problems such as uncontrolled expansion and difficult utilization in downstream industries, which is the most difficult and seriously restricts the sustainable development of steel industry. The expansion caused by free lime in steel slag is an important reason to restrict the largescale utilization of steel slag. Not all steel production enterprises know the importance of controlling the expansion of steel slag. TC17 brings together steel industry experts from all over the world who have extensive experience in by-product recycling of steel industry. Specific requirements for the use of byproducts in the steel industry are put forward, so that steel companies can use them more targeted, which can make by-products safer to use and better serve the steel industry. Steel companies can more easily use the standards developed by these experts to regulate these by-products. TC17 is the largest steel related TC in the world, and standardization of by-product utilization can bring sustainable development of TC17 standardization. Steel enterprises are very familiar with TC17, and doing a good job in the standardization of by-product utilization can more effectively promote the application and development of resource utilization technology, so that TC17 can get more attention from enterprises. The world's major steel producing countries have developed expansion test methods of steel slag used as aggregate of road construction. However, there is no universal standard for the expansion test method of steel slag at present. In European Union (EN1744-1 Test for chemical properties of aggregates -- Part 1:Chemical analysis), steel slag is accelerated curing by steam at 100 for 24h or 168h. United States (ASTM_D4792/D4792M Standard Test Method for Potential Expansion of Aggregates from Hydration Reactions) adopts 70 hot water for 7d. Japan (JIS A 5015 Iron and steel slag for road construction) uses accelerated curing in 80 hot water every 6h for 10d. The test method adopted in China is similar to that in the United States and Japan (GB/T24175 "Test Method for Stability of Steel Slag"), but it uses accelerated curing in 70 hot water every 6h for 10d. The lack of a unified standard for the expansion test method is not convenient for steel enterprises to control the expansion of factory steel slag and technological innovation of steel slag treatment. The establishment of the standard helps steel enterprises in various countries pay attention to the expansion inspection of steel slag leaving the factory and promote the progress of steel slag stabilization treatment.
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