Gas Blowing Grinding Technology Of BOF Slag And Its Industrialization

Slag is the byproduct of iron and steel producing, its quantity is about 15% of the steel output. The industry developed countries are all attaching importance to the disposing and integration utilizing of slag, their utilizing ratio have been above 87%. Its main uses are flux of pudding iron, the building road materials for highway and railway, agriculture fertilizer, materials for construction and so on. The let quantity of slag is 2000 ten thousand tons each year in our country, but compare to developed countries, the level gap of disposing and integration utilizing of slag is very big, the disposing techniques of slag are the key factor to affect utilizing of slag, the advanced disposing techniques of slag bring wide utilizing foreground for its integration utilizing.The Chengdou iron and steel factory located at the plain of west Sichuan, around it is fertilizing land, the question of disposing and stacking of slag is very eminent, it follow tradition abandoned slag techniques after the converter been put into production. Such abandoned slag techniques has several problems as follows: the security question of slag with high temperature is hard settled; affecting production; the charges is high; engross fertile land, pollution environment; the integration utilization is difficult.Based on the research fruit of Ma steel and iron factory, the paper carrying through research system and in-depth on slag gas blowing grinding techniques and craftworks parameter, combined the real things of Chengdou iron and steel inc., it bring forward craftwork design and the first to carry through the industrialization production in our country. Obtain success, the effect is good. It got the patent right in china, the patent right order is ZL93239693.3. The main work of this paper are as follows:1) Devise, produce, test the granular equipment of gas ejecting hole U shape tactic and the relatively position of airstream, insured this techniques advanced at the aspects of applying, safe, save energy.2)It researched the slag gas blowing grinding craftwork parameter thorough, bring forward the feasible craftwork parameter.3) Adopt the nitrogen as spraying gas, insured security, optimized environment, and saved investment.4) Have researched the physical and chemistry performance of gas blowing grinding slag, pointed out wide foreground for gas broken slag resourceful.5)The techniques can be applying into the production process of slag disposing of all kinds of metal smelting, metal and nonmetal melting and making grains.6)This research fruit occupy the leading status in china for its simple, security, low cost, saving energy, saving investment, favoring for environment and changing waste into treasure. It has been transferred to some ten iron and steel company inland for industrialization production, included the Taiwan china iron and steel inc., the transfer sum reached 164 ten thousand yuan, the technique have widely spreading and applying foreground.