CEO Choi said not only the fertilizer will improve the taste of rice and help boost income for farmers, but it will also enhance soil quality while helping reduce greenhouse gas emissions. 7) The deposit volume of steel slag in China exceeds 400 million tons, leading to the occupation of a large area of land and serious environment pollution. This slag is rich in silicic acid (SiO 2), which is essential for rice farming, so it is made and utilized as a ‘silicate slag fertilizer.’ The main component of silicate fertilizer is silicon (Si). Steel slag is the result of industrial processes in which iron mineral is reduced, generating products as pig iron (iron with a high proportion of carbon) and steel. This finding means that the TP and TK contents in the digestate with steel slag need be increased to improve the fertility efficiency of digestate and meet the standard of bioorganic fertilizer. oxides and trace elements arising from the refining of iron. Steel slag used to develop sustainable marine fertilizer July 27, 2020 July 27, 2020 admin 0 Comments Asia , Environment , Korea , Posco , Recycling POSCO, a major Korean steelmaker, has launched a sea forest cultivation program in Ulleung Island to mark the National Ocean Day. Like the old basic slag our grade of steel works slag called Super Slag Basic is principally a lime based material which has absorbed the oxides and trace elements arising from the refining of iron. slag volumes have been reduced on commercial scale from about 140 kg/tonne steel to 60 kg/tonne steel. EAF slag building material, not suitable as fertiliser Ladle slag Steel disintegration and sieving < 3,15 mm Humid Converter lime Fig. On October 30, 50 POSCO employees including the CEO Jeong-Woo Choi participated in corporate volunteering spreading fertilizer in the small town of Gwangyang near where POSCO’s Gwangyang Steelworks is located. One type of slag fertilizer for growing paddy rice is slag siliceous fertilizer (registration name: Calcium Silicate) made from iron and steel slag. In the Bessemer converter, there is a lining of lime which, in the process of manufacturing the steel, takes up a large percentage of phosphorus, in the form of phosphoric acid. POSCO Chairman Choi Jeong-woo and 50 employees participated in a volunteer event in Gwangyang, South Jeolla Province, to demonstrate how leftover slag can be used as fertilizer. At steelworks, steel is made by refining pig iron that is produced by reducing iron ore. For producing one ton of steel in this process, slag is required by approximately 0.4 ton. The efforts have been made in Tata steel that LD slag after grinding to 300 mesh, can be used as a soil conditioner in paddy field, tea gardens etc (Basu et al., 2002). This means that about 40 million tons of slag, the so-called iron and steel slag, is produced annually in Ja- Granulated slag for civil engineering works is used for purposes including coastal protection backfill, earth covering for correcting soft ground, road subgrade, and embankments. Water engineer Dr Biplob Pramanik said the study was the first to investigate potential applications for "sewage-enhanced" slag in construction material. Steel LD slag can also be used in fertilizers for agricultural applications (Das et al., 2007). The basic slag is obtained by the various processes of steel manufacture. Steel works slag is a by-product of the basic oxygen steel making process used by Corus at their Port Talbot, Scunthorpe and Teeside works. It appears in concrete, aggregate road materials, as ballast, and is sometimes used as a component of phosphate fertilizer. 1. The feasibility of steel slag used as an iron fertilizer was studied in a pot experiment with corn. In China, the first steel slag fertilizer program invested by Taiyuan Iron and Steel Group and Harsco Corporation of the USA started building in 2011 . The pile of steel slag occupies a huge area of arable land, and causes environmental pollution; moreover, 7%-15% steel can be recycled from steel slag. However, the current utilization rate of steel slag in China is only about 21%, which is far behind that of developed countries. After the steel slag is crushed, the qualified crushed steel slag will be fed into the cylinder by the feeder. The concrete made with post-treatment steel slag was about 17% stronger than concrete made with conventional aggregates, and 8% stronger than raw steel slag. Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore.Slag is usually a mixture of metal oxides and silicon dioxide.However, slags can contain metal sulfides and elemental metals. Moreover, model predictions have shown that, in principle, all slag can be recycled and the phosphorous extracted to produce fertilizer. Phosphatic guano was significantly more effective when it was combined with steel slag … LD steel slag as fertilizer in agriculture. Table 2–3 show that application of both iron slag (Q) and steel slag (H) fertilizers significantly increased dry weight of leaf and stem, and grain yield compared with the control (Si 0) treatment. Effect of steel slag fertilizer application on soil pH. This development is of particular significance POSCO (CEO Jeong-Woo Choi) is initiating a proactive promotion of eco-friendly siliceous fertilizer made from steel by-product, slag. A consecutive early rice-late rice rotation experiment was conducted to test the impacts of steel slag on soil pH, silicon availability, rice growth and metals-immobilization in paddy soil. Steel slag fertilizer was applied at a rate of 200 and 400 g m −2, which led to an increased yield of about 8% for the rice planted compared with the rice planted without the slag fertilizer application; this increase extended another 4% when the applied amount of slag was doubled (Gao et al., 2015). Most slags from steel pl ant derive from this pr ocess, with an average of 150-200 kg of slag generated per tonne of st eel … slag increased effectiveness of phosphatic guano for direct application as P fertilizer. Slag is a byproduct of metal smelting, and hundreds of tons of it are produced every year all over the world in the process of refining metals and making alloys.Like other industrial byproducts, slag actually has many uses, and rarely goes to waste. The LD slag contains about 1-3 wt% of P2O5, which is too low to be used as phosphate fertilizer, but, at the same time, it is too high to be used in the BF or recycled in the sinter plants. 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