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    3.
    发明专利
    未知

    公开(公告)号：DE1043295B

    公开(公告)日：1958-11-13

    申请号：DEB0042738

    申请日：1956-12-07

    Applicant: BASF AG

    Inventor： PFANNMUELLER DR WILHELM ,  JOHANNSEN DR ADOLF ,  WOLF DR HERBERT ,  WITTMANN DR GEORG

    IPC: C01B17/52 ,  C22B1/10

    Abstract: In roasting of materials containing roastable sulphur together with arsenic and/or antimony-e.g. pyrites, to form SO2, and solid residues free from arsenic and antimony, in a 2-stage fluidized layer process, the roaster gases and dust containing arsenic or antimony entrained therein from the first stage of the roasting process are subjected to dust removal above 600 DEG C. using say a cyclone separator, and entrained dust remaining in the roaster gases is burnt by subsequent combustion with oxygen or free oxygen containing gases, e.g. air in a small combustion chamber positioned after the separator. The proportion of oxygen or free oxygen-containing gases introduced into the combustion chamber is regulated to achieve combustion at a maximum temperature, Fe, As and Sb impurities being converted to the corresponding oxides Fe2O3, As2O3 and Sb2O3. The hot combustion gases are cooled to 450-350 DEG C. in a heat exchanger which may be a variable steam boiler and are finally subjected to electrical gas purification. Dust free from impurities may be removed from the heat exchanger and electrical gas purifier. Specifications 759,260 and 811,859 are referred to.

    4.
    发明专利
    未知

    公开(公告)号：DE1076646B

    公开(公告)日：1960-03-03

    申请号：DEB0050280

    申请日：1958-09-10

    Applicant: BASF AG

    Inventor： WITTMANN DR GEORG

    IPC: C01B17/52 ,  C22B1/02 ,  C22B1/10 ,  C22B1/14

    Abstract: A process for the production of gases containing sulphur dioxide together with the recovery of roasted residues practically free from arsenic and/or antimony and particularly lead. by the stepwise roasting of sulphidic ores containing arsenic and/or antimony and lead with free oxygen containing gases is effected in three successive fluidised layers, about one-third of the total amount of oxygen required for complete reaction with the sulphidic ores being supplied separately to each individual layer and the roaster gases being removed independently and separately from each layer, the temperature of the first layer being 550-800 DEG C. of the second layer more than 800 to 1000 DEG C., and of the third layer 550-800 DEG C. The temperature of the 1st layer is preferably 550-600 DEG C. and that of the 2nd layer 650-750 DEG C. The sulphidic ore may pass in succession through the fluidised layers under the influence of gravity. Flue dust contained in the roaster gases leaving any fluidised layer may be collected in a cyclone associated therewith and maintained at about the same temperature and passed hot together with the coarse, partially roasted ore to the next layer, the partially roasted ore preferably being introduced into the next layer through the dust outlet of the associated cyclone. By means of cooling surfaces within the individual layers, reaction heat beyond that required for maintenance of reaction temperature and to cover heat lost by radiation, together if desired with the sensible heat of the products of roasting, particularly that of the roaster gases, may be used in the production of hot water and/or steam. Specification 811,859 is referred to.

    5.
    发明专利
    未知

    公开(公告)号：DE1039044B

    公开(公告)日：1958-09-18

    申请号：DEB0036626

    申请日：1955-07-22

    Applicant: BASF AG

    Inventor： PFANNMUELLER DR WILHELM ,  WITTMANN DR GEORG ,  WOLF DR HERBERT

    IPC: C01B17/52 ,  C22B1/10 ,  H01J17/04 ,  H02M1/04

    Abstract: 792,394. Converting. SIEMENS SCHUCKERTWERKE AKT.-GES. April 16, 1956 [April 15, 1955; July 22, 1955; July 26, 1955], No. 11561/56. Class 38 (2). [Also in Group XL (c)] In an electric discharge vessel St, the discharges are initiated by application to the control electrode of a train of pulses obtained by differentiating the pulse train output of at least one semi-conductor triode acted upon by control alternating voltage of the same frequency as that applied to the main electrodes of the discharge vessel. The alternating voltage UTr added to a direct voltage Ur (Fig. 2a) is applied to the emitter-collector circuit of transistor T, between the emitter and base of which is connected direct voltage source Ge so that the emitter-collector current rapidly changes from zero to saturation and back again each cycle (Fig. 2b). These rapid changes of current in the primary winding of transformer W, produce voltage pulses (Fig. 2c) in the secondary winding which are applied to grid of valve St, biased by voltage Sp. The instants at which the pulses occur may be varied by altering the value of voltage Ur or the phase of the A.C. supply. In a modification the added alternating and direct voltages are applied between the base and emitter of a transistor, the current through the pulse transformer connected in series with a source of direct voltage between the collector and emitter being controlled by a second transistor which operates between zero current and saturation, Fig. 3 (not shown). The second transistor may alternatively be connected in the input to the first transistor to control the baseemitter current and thereby the collector current of the first transistor, Fig. 5 (not shown). In the modification of Fig. 6 the sum of alternating and direct voltages is applied to the base of transistor Ti through a current 'limiting transistor Te. The rectangular voltage is derived through capacitor Cd from the terminals of a resistor Rd connected in series with a D.C. source Ga, across the collector and emitter of transistor Ti. The collector Ic jumps rapidly between relatively low and high values corresponding to points A and B on the Ic, Uc characteristics shown in Fig. 7. The family of curves show the characteristics for different values of base current Ib, line AB, determined by the value of Rd being followed as Ib changes. Both points A, B lie below the permissible loss hyperbola Nc. The input voltage may be limited by the arrangement of resistor Rb and rectifiers HG. The ignition voltages may be amplified and supplied to the control grids. through a further transformer.

    10.
    发明专利
    未知

    公开(公告)号：DE1024493B

    公开(公告)日：1958-02-20

    申请号：DEB0034537

    申请日：1955-07-26

    Applicant: BASF AG

    Inventor： PFANNMUELLER DR WILHELM ,  WITTMANN DR GEORG ,  WOLF DR HERBERT

    IPC: C01B17/52 ,  C22B1/10 ,  H01J17/04 ,  H02M1/04

    Abstract: 792,394. Converting. SIEMENS SCHUCKERTWERKE AKT.-GES. April 16, 1956 [April 15, 1955; July 22, 1955; July 26, 1955], No. 11561/56. Class 38 (2). [Also in Group XL (c)] In an electric discharge vessel St, the discharges are initiated by application to the control electrode of a train of pulses obtained by differentiating the pulse train output of at least one semi-conductor triode acted upon by control alternating voltage of the same frequency as that applied to the main electrodes of the discharge vessel. The alternating voltage UTr added to a direct voltage Ur (Fig. 2a) is applied to the emitter-collector circuit of transistor T, between the emitter and base of which is connected direct voltage source Ge so that the emitter-collector current rapidly changes from zero to saturation and back again each cycle (Fig. 2b). These rapid changes of current in the primary winding of transformer W, produce voltage pulses (Fig. 2c) in the secondary winding which are applied to grid of valve St, biased by voltage Sp. The instants at which the pulses occur may be varied by altering the value of voltage Ur or the phase of the A.C. supply. In a modification the added alternating and direct voltages are applied between the base and emitter of a transistor, the current through the pulse transformer connected in series with a source of direct voltage between the collector and emitter being controlled by a second transistor which operates between zero current and saturation, Fig. 3 (not shown). The second transistor may alternatively be connected in the input to the first transistor to control the baseemitter current and thereby the collector current of the first transistor, Fig. 5 (not shown). In the modification of Fig. 6 the sum of alternating and direct voltages is applied to the base of transistor Ti through a current 'limiting transistor Te. The rectangular voltage is derived through capacitor Cd from the terminals of a resistor Rd connected in series with a D.C. source Ga, across the collector and emitter of transistor Ti. The collector Ic jumps rapidly between relatively low and high values corresponding to points A and B on the Ic, Uc characteristics shown in Fig. 7. The family of curves show the characteristics for different values of base current Ib, line AB, determined by the value of Rd being followed as Ib changes. Both points A, B lie below the permissible loss hyperbola Nc. The input voltage may be limited by the arrangement of resistor Rb and rectifiers HG. The ignition voltages may be amplified and supplied to the control grids. through a further transformer.

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