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    PRODUCTION OF CALCIUM CARBIDE
    25.
    发明专利
    PRODUCTION OF CALCIUM CARBIDE 未知

    公开(公告)号：ZA816418B

    公开(公告)日：1982-09-29

    申请号：ZA816418

    申请日：1981-09-16

    Applicant: HOECHST AG ,  RHEINISCHE BRAUNKOHLENW AG

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

    IPC: C01B32/942 ,  C01B

    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.

    26.
    发明专利
    未知

    公开(公告)号：NO803924L

    公开(公告)日：1981-06-30

    申请号：NO803924

    申请日：1980-12-23

    Applicant: HOECHST AG ,  KRUPP STAHL AG

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

    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.

    29.
    发明专利
    未知

    公开(公告)号：NO801468L

    公开(公告)日：1980-11-20

    申请号：NO801468

    申请日：1980-05-16

    Applicant: HOECHST AG

    Inventor： BRAUN ALBERT ,  PORTZ WILLI ,  STRAUSS GEORG

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

    Abstract: 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 oxide. To this end, a calcium carbide/calcium oxide/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 DEG C., it is crushed to particulate material with a size of less than 150 mm. Next, the hot crushed material of at least 400 DEG C. is admixed with a quantity of calcium oxide necessary to have in the resulting mixture an overall content 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 DEG C. to particulate material with a size of less than 10 millimeters.

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