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公开(公告)号：ZA821939B
公开(公告)日：1983-02-23
申请号：ZA821939
申请日：1982-03-23
Applicant: HOECHST AG
Abstract: The disclosure relates to a process for the manufacture of desulfurizing agents containing 1-6 weight % chemically combined water, based on calcium oxide and carbon-containing calcium carbide, for crude iron and steel melts. More particularly, the disclosure provides for a molten mixture of calcium carbide and calcium oxide containing 20 to 80 weight % CaO to be made from lime and coke; for the mixture to be allowed to cool and solidify into a block; for the solidified block while it still has an average temperature of more than 400 DEG C. to be crushed to particles with a size of less than 150 mm; for the comminuted mixture, which still has a temperature of at least 400 DEG C. to be admixed with a quantity of calcium oxide necessary to establish in the resulting mixture a total content of CaO corresponding to the CaO content desired in the end product; and for the mixture to be gound while intensively mixing it with free carbon and carbonate in the presence of air or nitrogen with a moisture content of 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.
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公开(公告)号：AU6585480A
公开(公告)日：1981-07-09
申请号：AU6585480
申请日：1980-12-24
Applicant: HOECHST AG , KRUPP STAHL AG
Inventor： BRAUN A
IPC: C01B32/942 , C21C1/02 , C21C7/064 , C21C7/076 , C21C7/02
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.
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Patent Agency Ranking
公开(公告)号：SE7807182A
公开(公告)日：1978-12-26
申请号：SE7807182
申请日：1978-06-22
Applicant: HOECHST AG
IPC: C21C1/02
CPC classification number: C21C1/025
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公开(公告)号：ZA808065B
公开(公告)日：1982-01-27
申请号：ZA808065
申请日：1980-12-29
Applicant: HOECHST AG , KRUPP STAHL AG
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公开(公告)号：BR8008500A
公开(公告)日：1981-07-14
申请号：BR8008500
申请日：1980-12-23
Applicant: KRUPP STAHL AG , HOECHST AG
IPC: C01B32/942 , C21C1/02 , C21C7/064 , C21C7/076
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.
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公开(公告)号：ZA8002943B
公开(公告)日：1981-06-24
申请号：ZA8002943
申请日：1980-05-16
Applicant: HOECHST AG
CPC classification number: C21C1/025 , C21C7/0645
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