8/16/2023 0 Comments Ld process of steel makingThe global warming effect and natural resource saving are the general environmental topics nowadays. With the rapid growth of industrialization, the available land for dispose of large quantities of metallurgical slag like LD slag at a landfill site is reducing the disposal cost becomes increasingly higher in all over the world respectively. Out of this only 25% is being reused in India compared to 70-100% in other countries (Umadevi et al., 2010). It has been observed that, 50% of slag has been used for the road project, for sintering and iron-making recycling in steel making plant (Gao et al., 2011). The amount of LD slag is about 200kg/t of hot metal produced in Indian integrated steel plants. The generation of steel melting slag is over 4 to 4.5 MT per annum. The generation per annum is 1.28 MT in SAIL (Basu, 2002) and worldwide generation is about 47 MT per annum (Takano et al., 2001). The total generation rate of LD slag is 150-180kg/t of crude steel in India (Yadav et al., 2002). LD converter steel making slag is one of the important wastes in all integrated steel plant. Basically, LD slag is generated from steel making process or pig iron refining process in oxygen converters, this process is Linz- Donawitz process (Das et al., 2007 Alexandre et al., 1993 Wu et al., 2007 Shen et al., 2009). It can be categorized as carbon steel slag and stainless steel slag according to the type of steel, and as pretreatment slag, Linz-Donawitz (LD) converter slag, electrical arc furnace slag (EAFS), ladle refining slag and casting residue according to the steelmaking process (Meng and Liu, 2000). Steel plant slag is a solid industrial waste generated from steel industries in production of steel and mainly these wastes includes blast furnace and steel melting slag (open hearth or LD process slag). Therefore, this waste can be utilized for enhancing yield as well as solving the disposal problem and improve the environment. The local availability of non conventional sources of plant nutrients and soil conditioners plays a vital role because of the non availability and higher price of environmental fertilizers. Due to increasing awareness of the environment, disposal, reuse of wastes without harming the environment has became a prime concern for the industry. The physical and chemical characteristics of steel slag were analyzed and then the research progress of steel slag utilization in agriculture as fertilizer introduced. Improving the slag utilization is an important way to resolve these problems. At present, the amount of slag deposited in storage yard, leading to the occupation of farm land and serious pollution to the environment. This paper deals with the present and possible use of LD slag in agriculture. Slag generated from basic oxygen furnace (BOF) or Linz-Donawitz (LD) converter is one of the recyclable wastes in integrated steel plants.
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