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    11.
    发明专利
    未知

    公开(公告)号：DE2609831A1

    公开(公告)日：1977-09-22

    申请号：DE2609831

    申请日：1976-03-10

    Applicant: DEGUSSA

    Inventor： ACHENBACH KARL ,  TUERK GUENTER DR

    IPC: C01B33/12 ,  C01B33/193 ,  C01B33/20 ,  C01B33/22 ,  C01B33/32 ,  C01B33/18 ,  C01B33/26

    Abstract: There is provided a process for treating air-borne dust containing silicon dioxide in order to form a silicic acid or a silicate. The air-borne dust is dissolved in an alkali metal hydroxide solution to form an alkali metal silicate solution. The alkali metal silicate solution is purified by treating it with activated charcoal and/or oxidation agents. Non-decomposable substances remaining after the purification step are removed from the alkali metal silicate solution. The alkali metal silicate solution is then reacted with acids and/or salts of aluminum, magnesium and calcium. The resulting product is then filtered, washed and dried, and then comminuted to form a finely divided, amorphous, substantially pure, precipitated, silicic acid or silicate having a whiteness according to Berger at a wave length of 460 m mu of about 90 to about 95% and a specific surface area of about 30 to about 800 m2/g BET. The resulting products are useful as reinforcing fillers in the rubber and plastics industries, as well as additives in the paint, varnish, lacquer, paper, cosmetic, pharmaceutical, feed and pesticide industries.

    12.
    发明专利
    未知

    公开(公告)号：AT182125T

    公开(公告)日：1999-07-15

    申请号：AT96108372

    申请日：1996-05-25

    Applicant: DEGUSSA

    Inventor： TUERK GUENTER DR ,  SCHMIDT GEROLD ,  SIRAY MUSTAFA DR ,  MEIER KARL

    IPC: C01B33/193 ,  H01M2/16

    Abstract: Precipitated silicic acid has a BET surface area of 100-130m /g (DIN 66131); a DBP absorption (water-free (DIN53601) ASTM D244 of plus or minus 275g/100g, a dry loss (2 hrs./105 degrees C) of 3.5-5.5 wt.% (DIN ISO787/11,ASTM D280, JISK5101/21), and a sieve residue with ALPINE air sieve of plus or minus 10;0 wt.% (

    14.
    发明专利
    未知

    公开(公告)号：TR199600604A2

    公开(公告)日：1997-02-21

    申请号：TR9600604

    申请日：1996-07-24

    Applicant: DEGUSSA

    Inventor： TUERK GUENTER DR ,  SCHMIDT GEROLD ,  SIRAY MUSTAFA DR ,  MEIER KARL

    IPC: C01B33/193 ,  H01M2/16 ,  C01B33/12

    Abstract: Precipitated silicic acid has a BET surface area of 100-130m /g (DIN 66131); a DBP absorption (water-free (DIN53601) ASTM D244 of plus or minus 275g/100g, a dry loss (2 hrs./105 degrees C) of 3.5-5.5 wt.% (DIN ISO787/11,ASTM D280, JISK5101/21), and a sieve residue with ALPINE air sieve of plus or minus 10;0 wt.% (

    20.
    发明专利
    未知

    公开(公告)号：DE2651384A1

    公开(公告)日：1978-05-24

    申请号：DE2651384

    申请日：1976-11-11

    Applicant: DEGUSSA ,  HENKEL KGAA

    Inventor： ACHENBACH KARL ,  TUERK GUENTER DR

    IPC: C01B39/16 ,  C01B33/32 ,  C01B39/14 ,  C01B33/26 ,  C11D3/08

    Abstract: Silicon dioxide containing waste flue dust from the production of silicon metal and silicon alloys is converted to crystalline zeolite molecular sieves of type A by (1) dissolving the flue dust in alkali metal hydroxide solution with the formation of alkali metal silicate solution having a module (SiO2:Me2IO) in the range of 2.0:1 to 3.5:1 at a temperature of 60 DEG -100 DEG C.; (2) purifying the thus obtained alkali metal silicate solution from organic constituents by treatment with activated carbon and/or an oxidizing agent and separating the non-decomposable residue from the solution; and, (3) reacting alkali metal aluminate solution present at room temperature with the diluted, purified alkali metal silicate solution with a module (SiO2:Na2O) of 2.0:1 to 3.5:1 obtained by steps (1) and (2) and subsequently crystallizing the reaction mixture ((2.0-4.4)Na2O:Al2O3; (1.3-1.8)SiO2:(90-120)H2O) at a temperature of 90 DEG -95 DEG C. for a period of 6-12 hours, subsequently filtering, washing to pH of about 10-11 and drying to recover a crystalline, zeolitic molecular sieve of type A having a degree of whiteness according to Berger (A. Berger, Die Farbe 8 Nr. 4/6 (1959) pages 187-202) at 460 mu in the range of 90-95%.

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