公开(公告)号：US3912646A

公开(公告)日：1975-10-14

申请号：US31307272

申请日：1972-12-07

Applicant: BAYER AG

Inventor： LEITNER LUTZ ,  HUND FRANZ ,  RADEMACHERS JAKOB

IPC: C01G49/06 ,  C09D5/23 ,  G11B5/706 ,  H01F1/11 ,  C04B35/00

CPC classification number: G11B5/70673 ,  C01G49/06 ,  C01P2004/10 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2006/42 ,  G11B5/70642 ,  G11B5/70647 ,  G11B5/70652 ,  G11B5/70663 ,  G11B5/70668

Abstract: In the production of acicular ferromagnetic iron oxides from acicular iron oxide hydroxide prepared by precipitating at least one of iron (II) hydroxide and carbonate from an aqueous iron (II) salt solution by the addition of an aqueous solution containing a stoichiometric excess of at least one of an alkali hydroxide and carbonate, oxidizing the precipitated product into iron oxide hydroxide, and separating the product of oxidation from the reaction medium, the improvement which comprises carrying out the oxidation of the precipitated iron hydroxide or carbonate at least partly at a temperature of about 45*C to 75*C, by passing a finely dispersed oxygen-containing gas through the solution at a volume (liter) ratio of from about 5:1 to 80:1 while stirring at an intensity such that the acicular iron oxide hydroxide accumulates in a volume-time yield of from about 6 to 25 g per liter per hour.

Abstract translation: 在从针状铁氧化物氢氧化物生产针状铁磁性氧化铁的过程中，通过加入含有化学计量过量的至少一种水溶液而使铁（II）盐水溶液中沉淀出氢氧化铁（II）和碳酸铁中的至少一种， 碱金属氢氧化物和碳酸盐之一，将沉淀的产物氧化成氧化铁氢氧化物，并将氧化产物从反应介质中分离出来，其改进包括至少部分地在沉淀的氢氧化铁或碳酸盐的温度 通过使细分散的含氧气体以约5:1至80:1的体积（升）比通过溶液，同时搅拌，使得针状铁氧化物氢氧化物的强度为约45℃至75℃ 以每升每小时约6至25g的体积 - 时间产率累积。

公开(公告)号：US3615810A

公开(公告)日：1971-10-26

申请号：US3615810D

申请日：1969-06-13

Applicant: BAYER AG

Inventor： HOLZNAGEL WILHELM ,  HUND FRANZ ,  GERLACH GOTTFRIED

IPC: C09C1/24

CPC classification number: C09C1/24 ,  C01P2006/37

Abstract: Process for the production of a temperature-stable solid black pigment of high tinting strength consisting essentially of mixed oxides of iron and manganese, by calcining an intimate finely divided mixture of oxidic or oxide-forming starting materials of iron and manganese, e.g., Fe3O4, Fe(OH)3, FeOOH and active Fe2O3 and MnCO3, Mn2O3, MnOOH and pyrolusite (i.e., MnO2), in a ratio by weight corresponding to 25-90 parts of Mn2O3 to 75-10 parts of Fe2O3, at a temperature of about 800*-920* C. in an atmosphere having an oxygen content of about 7-20 percent by volume, optionally in the presence of an alkali metal salt, e.g., NaC1, or boron oxide, as mineralizer; and the corresponding pigment thereby produced.

公开(公告)号：US3667913A

公开(公告)日：1972-06-06

申请号：US3667913D

申请日：1970-05-04

Applicant: BAYER AG

Inventor： HUND FRANZ

IPC: B01J23/26 ,  C01B7/04 ,  C01B7/13 ,  C01B17/78 ,  C01B21/26 ,  C01B21/40 ,  C01B32/50

CPC classification number: C01B17/78 ,  B01J23/26 ,  C01B7/04 ,  C01B7/13 ,  C01B21/265 ,  C01B21/40 ,  C01B32/50

Abstract: CHROMIUM-DIOXIDE OF RUTILE-TYPE CRYSTAL-STRUCTURE AND MODIFIED CHROMIUM-DIOXIDE CONTAINING OXIDES AND/OR FLUORIDES OF CATIONS WHICH HAVE RADII IN THE RANGE BETWEEN 0.46 AND 0.91 A. CAN BE USED AS CATALYSTS WITH HIGH AND PERMANENT ACTIVITY TO PROMOTE OXIDATION-PROCESSES SUCH AS OXIDATION OF HYDROGEN-CHLORIDE TO CHLORINE AND WATER, CONVERSION OF SULFUR-DIOXIDE TO SULFUR-TRIOXIDE OXIDATION OF CARBON-MONOXIDE TO CARON-DIOXIDE, OXIDATION OF AMMONIA TO NITRIC OXIDES OXIDATION AND OXYCLORINATION OF HYDROCARBONS, COMBUSTION OF HYDROGEN OR ALCOHOLS AND THE LIKE. THE CHROMIUM-DIOXIDE OR THE MODIFIED CHROMIUM-DIOXIDE CAN BE USED AS SUCH OR TOGETHER WITH CARRIERS. FURTHERMORE IT IS POSSIBLE TO COMBINE THE CHROMIUM-DIOXIDE CATALYSTS WITH OTHER CATALYTICALLY ACTIVE MATERIALS.

公开(公告)号：US3579452A

公开(公告)日：1971-05-18

申请号：US3579452D

申请日：1968-08-28

Applicant: BAYER AG

Inventor： HUND FRANZ

IPC: C01G45/12 ,  C04B35/01 ,  G03G5/16 ,  G11B5/706 ,  H01F1/03

CPC classification number: C01G53/56 ,  C01P2002/54 ,  C01P2006/42 ,  C04B35/016 ,  G03G5/16 ,  G11B5/706 ,  H01F1/0317

Abstract: PRODUCTION OF FERROMAGNETIC PURE AND ISOTYPE MANGANATE MIXED PHASES OF THE COMPOSITION

NI1-XCOX.0.91-1.1MNO3; WHERE 0$X$0.20 THAT CRYSTALLIZE IN THE ILMENITE LATTICE, BY PRECIPITATING SUCH MIXED PHASE CONSTITUENTS FROM AN AQUEOUS SALT SOLUTION OF MANGANESE AND NICKEL, OR MANGANESE, NICKEL AND COBALT, IONS, IN QUANTIIATIVE PROPORTIONS WHICH CORRESPOND DIRECTLY TO THOSE OF THE REQUIRED END COMPOUND, BY INSTANTLY INTERMIXING SUCH REACTANTS WITH A BASIC PRECIPITANT AT ABOUT 0-100*C. OXIDIZING THE RESULTING SUSPENSION, AND THEN FILTERING, WASHING, CALCINING AND COOLING THE RESULTING PRECIPITATE.