NEW DESULPHURATING AGENTS FOR DECREASING SULPHUR CONTENT OF IRON MELTS TO ULTRA LOW LEVEL

摘要

The invention relates to new desulphurating agents for decreasing sulphur content of iron melts to ultra low level (to 0.001% or lower), wherein said agents contain 30-60 w% of non-metallic and 70-40 w% of metallic components, the non-metallic component being tricalciuminate (3CaO.Al2O3) complex oxide, and the metallic component being a Mg or Ca based alloy constituting stable sulphides (Cas or MgS), and wherein the metallic and non-metallic components from molecular pairs with each other. The invention also discloses a method to produce the desulphurating agents according to the invention, comprising the steps of metering adequate quantity of ingoing materials of each desulphurating agents, then individually mixing each reactive components metered in the first step, crushing and homogenizing the mixture by further mixing, briquetting and optionally preheating the powder obtained, vacuum sintering briquettes at a temperature between 850-1100ºC, and a pressure between 10-6 - 10-5bar, and optionally crushing and milling the sintered desulphurating agents before using.