公开(公告)号：DK550980A

公开(公告)日：1981-06-30

申请号：DK550980

申请日：1980-12-23

Applicant: HOECHST AG

Inventor： BRAUN A ,  PORTZ W ,  STRAUSS G ,  DELHEY H M

IPC: C21C1/02 ,  C21C7/064 ,  C21C7/076 ,  C21C

Abstract: The invention relates to agents for the desulfurization of metal melts, especially of steel and crude iron melts, based on mixtures of CaC2/CaO crystals produced in the fused mass. A portion of the CaO in the crystal mixture is hydrated to form Ca(OH)2. A process for the manufacture of these agents is also described.

公开(公告)号：DK550880A

公开(公告)日：1981-06-30

申请号：DK550880

申请日：1980-12-23

Applicant: HOECHST AG ,  BOCHUM AG

Inventor： BRAUN A ,  PORTZ W ,  STRAUSS G ,  DELHEY H M

IPC: C01B32/942 ,  C21C1/02 ,  C21C7/064 ,  C21C7/076 ,  C21C

Abstract: The present invention relates to a process for the manufacture of desulfurizing agents containing 1-6% by weight of chemically bonded water, based on calcium oxide-containing calcium carbide, for crude iron and steel melts. To this end, a molten mixture of calcium carbide and calcium oxide with a CaO content of 20 to 80% by weight is produced, which is allowed to solidify into a block. Next, the block which still has an average temperature of more than 400 DEG C., is rough-crushed to particles with a size of less than 150 mm and calcium oxide is added to the comminuted mixture, which still has a temperature of at least 400 DEG C., in accordance with the CaO content desired in the end product. The mixture is finally ground in the presence of air or nitrogen with a moisture content of from 5 to 20 g/m3 (at 1.013 bar and 273.15 K) at temperatures below 100 DEG C. to particles with a size of less than 10 mm.