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    PROCESS FOR MAKING CALCIUM CARBIDE
    62.
    发明专利
    PROCESS FOR MAKING CALCIUM CARBIDE 未知

    公开(公告)号：IN155789B

    公开(公告)日：1985-03-09

    申请号：IN935CA1981

    申请日：1981-08-21

    Applicant: HOECHST AG ,  RHEINISCHE BRAUNKOHLENW AG

    Inventor： KERSTING HANS JOACHIM ,  WOLFRUM ERHARD ,  PORTZ WILLI ,  STRAUSS GEORG

    IPC: C01B32/942 ,  C01B31/32

    Abstract: The invention relates to a process for making calcium carbide by reacting an excess of coke with quicklime in the presence of oxygen in an oxygen-thermal furnace. To this end, the invention provides for precrushed coal to be used as starting material for coke and precrushed lime hydrate (Ca(OH)2) or precrushed limestone (CaCO3) to be used as a starting material for quicklime. The precrushed materials are mixed and the resulting mixture is introduced into a drying zone and freed therein at 80 DEG to 120 DEG C. from adhering water. Next, the warm mixture coming from the drying zone, and air, are introduced into a calcining apparatus in which the coal constituent is coked and the lime constituent is simultaneously dehydrated or decarbonized, at temperatures of 900 DEG to 1400 DEG C. The thermally-pretreated mixture of starting materials with an inherent temperature of 900 DEG to 1000 DEG C. is then directly introduced into the oxygen-thermal furnace and reacted with oxygen to calcium carbide.

    PRODUCTION OF CALCIUM CARBIDE
    64.
    发明专利
    PRODUCTION OF CALCIUM CARBIDE 未知

    公开(公告)号：CA1168832A

    公开(公告)日：1984-06-12

    申请号：CA384441

    申请日：1981-08-24

    Applicant: HOECHST AG ,  RHEINISCHE BRAUNKOHLENW AG

    Inventor： KERSTING HANS-JOACHIM ,  WOLFRUM ERHARD ,  PORTZ WILLI ,  STRAUSS GEORG

    IPC: C01B32/942 ,  C01B31/32

    Abstract: PRODUCTION OF CALCIUM CARBIDE The invention relates to a process for making calcium carbide by reacting an excess of coke with quicklime in the presence of oxygen in an oxygen-thermal furnace. To this end, the invention provides for precrushed coal to be used as starting material for coke and precrushed lime hydrate (Ca(OH)2) or precrushed limestone (CaC03) to be used as a starting material for quicklime. The precrushed materials are mixed and the resulting mixture is introduced into a drying zone andand freed therein at 80 to 120.degree.C from adhering water. Next, the warm mixture coming from the drying zone, and air, are introduced into a calcining apparatus in which the coal constituent is coked and the lime constituent is simultaneously dehydrated or decarbonized, at temperatures of 900 to 1400.degree.C. The thermallypretreated mixture of starting materials with an inherent temperature of 900 to 1000.degree.C is then directly introduced into the oxygen-thermal furnace and reacted with oxygen to calcium carbide.

    67.
    发明专利
    未知

    公开(公告)号：DD201665A5

    公开(公告)日：1983-08-03

    申请号：DD23331481

    申请日：1981-09-15

    Applicant: HOECHST AG ,  RHEINISCHE BRAUNKOHLENW AG

    Inventor： KERSTING HANS-JOACHIM ,  WOLFRUM ERHARD ,  PORTZ WILLI ,  STRAUSS GEORG

    IPC: C01B32/942 ,  C01B31/32

    Abstract: The invention relates to a process for making calcium carbide by reacting an excess of coke with quicklime in the presence of oxygen in an oxygen-thermal furnace. To this end, the invention provides for precrushed coal to be used as starting material for coke and precrushed lime hydrate (Ca(OH)2) or precrushed limestone (CaCO3) to be used as a starting material for quicklime. The precrushed materials are mixed and the resulting mixture is introduced into a drying zone and freed therein at 80 DEG to 120 DEG C. from adhering water. Next, the warm mixture coming from the drying zone, and air, are introduced into a calcining apparatus in which the coal constituent is coked and the lime constituent is simultaneously dehydrated or decarbonized, at temperatures of 900 DEG to 1400 DEG C. The thermally-pretreated mixture of starting materials with an inherent temperature of 900 DEG to 1000 DEG C. is then directly introduced into the oxygen-thermal furnace and reacted with oxygen to calcium carbide.

    PROCESS FOR THE MANUFACTURE OF DESULFURIZING AGENTS FOR CRUDE IRON OR STEEL MELTS
    68.
    发明专利
    PROCESS FOR THE MANUFACTURE OF DESULFURIZING AGENTS FOR CRUDE IRON OR STEEL MELTS 未知

    公开(公告)号：CA1149618A

    公开(公告)日：1983-07-12

    申请号：CA368479

    申请日：1981-01-14

    Applicant: HOECHST AG ,  KRUPP STAHL AG

    Inventor： BRAUN ALBERT ,  PORTZ WILLI ,  STRAUSS GEORG ,  DELHEY HANS-MARTIN

    IPC: C21C7/064

    Abstract: PROCESS FOR THE MANUFACTURE OF DESULFURIZING AGENTS FOR CRUDE IRON OR STEEL MELTS 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.degree. 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.degree. 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.degree. C to particles with a size of less than 10 mm.

    PRODUCTION OF AGENT FOR DESULFURIZING CRUDE IRON AND STEEL MELTS
    70.
    发明专利
    PRODUCTION OF AGENT FOR DESULFURIZING CRUDE IRON AND STEEL MELTS 未知

    公开(公告)号：CA1141965A

    公开(公告)日：1983-03-01

    申请号：CA350242

    申请日：1980-04-21

    Applicant: HOECHST AG

    Inventor： BRAUN ALBERT ,  PORTZ WILLI ,  STRAUSS GEORG

    IPC: C01B32/942 ,  C21C1/02 ,  C21C7/064 ,  C21C7/076 ,  C21C1/04

    Abstract: PRODUCTION OF AGENT FOR DESULFURIZING CRUDE IRON AND STEEL MELTS The invention relates to the production of an agent for desulfurizing crude iron and steel melts, the desulfurizing agent being based on calcium carbide containing calcium carbide To this end, a calcium carbide/calcium oxcide/starting melt mixture with a CaO-content within the range 20 to 80 weight% is produced from lime and coke and allowed to solidify to a block. While the solidified block still has an average temperature of more than 400 C, it is crushed to particulate material with a size of less than 150 mm. Next, the hot crushed material of at least 400.degree. C is admixed with a quantity of calcium oxide necessary to have in the resulting mixture an overall con tent of CaO corresponding to that desired for the final product. The whole is thoroughly mixed and crushed with exclusion of moisture at temperatures higher than 100.degree. C to particulate material with a size of less than 10 milli-meter.

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