Slag covering agent

• Main Authors: ZHANG DAKUI, YU SHUJUAN, HOU HONGYU, WANG XIANGFENG, XU PENGFEI, ZHANG TIANFU, MA GUANGYU, LIU CHANGPENG, LI WEIDONG, YANG DAZHENG
• Format: Patent
• Language: English
• Published: 03.02.2016
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING

The invention provides a slag covering agent which is composed of an introduction material of C and an introduction material of SiO2. The slag covering agent comprises, by weight, 40-95% of C, 5-20% of SiO2, 0-10% of Al2O3, 0-10% of CaO, 0-10% of MgO, 0-1.0% of water and 0-15% of impurities. The introduction material of C is one or two of blast furnace gas dust with the content of C being above 5%, gangue, carbonized rice hulls, pulverized coal and coke powder. The introduction material of SiO2 is one or two of pulverized coal with the content of SiO2 being above 10%, heating furnace waste sand, cast waste sand and carbonized rice hulls. The volume density of the slag covering agent is 0.55-2.90 g/cm . The slag covering agent can effectively prevent the slag surface from crusting, direct outward heat dissipation of the slag surface is reduced, the slag outflow rate and the productivity are increased, the stability of slag surface components is guaranteed, and interference to target slag components and the subsequent product performance is avoided. Meanwhile, the operation time for subsequent temperature increase can be shortened, energy consumption can be lowered, and use cost can be reduced.