Hot Metal "three Off The Pretreatment Process And Its Role In The Development Of The Kunming Iron And Steel

In this article, the writer analyzes the status and development trend of the iron and steel industry, and the current situation of Kunming Iron & Steel (Group) Co., Ltd. (KISC), argues that KISC plays an epigone role during the development of the iron and steel industry of China, whose products and technical equipments can hardly meet the higher requirements of its own development and social and economic development. Facing crises of scientific and technical advancement of iron and steel production, shortage of resources, national restructuring of the iron and steel industry, and global economic integration, it's so urgently necessary for KISC to enhance its own core competitiveness.The pretreatment of hot metal is an external treatment technology which has been developed during the growth of the iron and steel industry, striving for technical optimization, efficient and eco-friendly production. It can effectively get rid of redundant sulfur, phosphorus and silicon from the hot metal before been put into furnace, to optimize the product composition of quality, variety and cost of an enterprise to improve its own core competitiveness.In this article, by comparative research of the basic principles, agents, methods and effects of the hot metal pretreatments of desiliconization, dephosphorization and desulphurization, the writer defines that the converter-shaped pretreatment of desiliconization, dephosphorization and desulphurization has become the key pretreatment technique of the hot metal for its fine effect, low cost, and outstanding economic and environmentally friendly advantages.Based on the research, founded on existing production conditions, production capability and technical natures of KISC, especially its own development requirements, linked with the development trend of the iron and steel industry, fully considering the continuity of equipment upgrade and technical optimization of KISC, guided under principles of validity and benefit, the writer analyses and argues that in current conditions. KISC shall not adopt the hot metal pretreatment of desiliconization, dephosphorization and desulphurization, but the end-point converter process to improve the dephosphorization effect. But according to the development plan of KISC, with its scale development, upgradeof equipment and technical conditions and implementation of a plan to use high-phosphorus ironstone, it's more suitable to adopt the converter-shaped pretreatment of desiliconization, dephosphorization and desulphurization. For KISC, the technology shall firstly use high-phosphorus ironstone efficiently which can not completed by the current picking technology or blast furnace process, to greatly reduce ironstone cost that occupies the most proportion of iron and steel production cost, easy cost pressure caused by international and domestic shortage of production materials, induce transportation risk, to assuringly supply KISC with a great deal of cheap raw materials and create great economic profit; Secondly it shall promote KISC to update its products, especially high-added-value products of lowest phosphorus and lowest sulfur, to enhance its ability to adapt market and gain profit; Thirdly it shall improve technical and economic indexes of blast furnace and converter, and be helpful for efficient blast smelting and less-slag melting of converter process; Furthermore the technology shall greatly promote the stable operation of melting process and the control of the production of high-temperature and high-quality casting blank, to realize efficient continuous casting and continuous casting and rolling to improve KISC's production intensification; Finally the technology shall distribute melting functions and optimize production processes, to improve the auto-control of melting and continuous casting, to realize the integrated management of technology, equipment, production organization and management, logistic management, and production running of smelting, continuous casting and rolling.By analysis and research, the writer presents a new thought to enhance KISC's core competitiveness, to promote its sustainable development and the development aim of becoming larger, more advanced and stronger.