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Application of Fly Ash from Pulp and Paper Industries as Slag Formers in Electric Arc Furnace Stainless Steel Production
Steel Research International ( IF 1.9 ) Pub Date : 2020-06-03 , DOI: 10.1002/srin.202000050
Tova Jarnerud 1 , Xianfeng Hu 2 , Andrey V. Karasev 1 , Chuan Wang 2 , Pär G. Jönsson 1
Affiliation  

During electric arc furnace (EAF) steelmaking process, burnt lime is charged together with other slag forming materials to attain a specific basicity of the slag and to achieve purification by removing unwanted elements. Herein, fly ash (FA) containing ≈60% CaO generated from pulp/paper mills is tested to partially (15–50%) replace primary lime (PL) in pilot scale EAF trials. The obtained results show good possibilities. It is found that an increased amount of FA instead of PL reduces the required amount of FeSi (up to 3 kg t−1 of scrap) and increases the sulfur content in the final slag. As a result, the amount of required slag/ton of steel can be decreased. However, the phosphorus content in the metal is slightly increased. The replacement ratio of FA will be limited by the acceptable phosphorus level in the final steel, due to higher phosphorus content in FA from pulp and paper mills compared with that in PL. Applications of FA as slag formers can reduce the consumption of natural resources in the metallurgical processes. In addition, it can reduce the amount of wastes from pulp/paper industries sent to landfill, which is important from an environmental point of view.

中文翻译:

制浆造纸业粉煤灰作为炉渣形成剂在电弧炉不锈钢生产中的应用

在电弧炉(EAF)炼钢过程中,将生石灰与其他炉渣形成材料一起装填,以达到炉渣的特定碱度,并通过去除多余的元素实现净化。在此,在中试规模的电弧炉试验中,对纸浆厂/造纸厂产生的约60%CaO的粉煤灰(FA)进行了部分(15-50%)替代初级石灰(PL)的测试。获得的结果显示出很好的可能性。发现用FA代替PL可以减少所需的FeSi量(最高3 kg t -1的废料),并增加了最终矿渣中的硫含量。结果,可以减少所需的钢渣/吨钢量。但是,金属中的磷含量略有增加。由于纸浆和造纸厂的FA中的磷含量比PL中的高,FA的置换率将受到最终钢中可接受的磷含量的限制。将FA用作成渣剂可以减少冶金过程中自然资源的消耗。此外,它还可以减少制浆/造纸行业向填埋场发送的废物量,这从环境角度来看很重要。
更新日期:2020-06-03
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