KR910011687A - 무기 바륨을 포함하는 고체조성물의 제조방법 - Google Patents

무기 바륨을 포함하는 고체조성물의 제조방법 Download PDF

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KR910011687A
KR910011687A KR1019900018489A KR900018489A KR910011687A KR 910011687 A KR910011687 A KR 910011687A KR 1019900018489 A KR1019900018489 A KR 1019900018489A KR 900018489 A KR900018489 A KR 900018489A KR 910011687 A KR910011687 A KR 910011687A
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solid composition
carbonate
barium
alkali
sulfide
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KR1019900018489A
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KR0146368B1 (ko
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포르타 자소포
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원본미기재
칼리케미 아크티엔 게젤샤프트
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/186—Strontium or barium carbonate
    • C01F11/188—Barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C—CHEMISTRY; METALLURGY
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    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/04—Clay; Kaolin
    • C04B33/06—Rendering lime harmless
    • C04B33/08—Preventing efflorescence
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/132—Waste materials; Refuse; Residues
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/32—Burning methods
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62625—Wet mixtures
    • C04B35/6263—Wet mixtures characterised by their solids loadings, i.e. the percentage of solids
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3215—Barium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
    • C04B2235/442—Carbonates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6562—Heating rate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6565—Cooling rate
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
    • C04B2235/726—Sulfur content
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Detergent Compositions (AREA)

Abstract

내용 없음

Description

무기 바륨을 포함하는 고체조성물의 제조방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음

Claims (17)

  1. CO2, CO2를 포함하는 기체혼합물, 알카리 하이드로겐 카보네이트 또는 알칼리 카보네이트와 황화바륨 여과액의 여과액 잔사를 수성 매질에서 반응시켜 고체 조성물 및 수성 황화수소용액 또는 황화알카리 용액을 포함하는 반응혼합물로 변화시키고 이 반응 혼합물로 부터 고체조성물을 분리시킴을 특징으로 하는 무기바륨을 포함하는 고체조성물의 제조방법.
  2. 제1항에 있어서, 알카리 여과액은 물에 현탁된 형으로 사용됨을 특징으로 하는 방법.
  3. 제1항이나, 2항에 있어서, 알카리 카보네이트를 이용함을 특징으로 하는 방법.
  4. 전항의 어느 한항에 있어서, 알카리 카보네이트는 수용액 형태로 사용됨을 특징으로 하는 방법.
  5. 제4항에 있어서, 알카리 카보네이트가 5-15wt% 포함된 수용액을 사용함을 특징으로 하는 방법.
  6. 전항의 어느 한항에 있어서, 알카리 카보네이트는 여과의 잔사내의 황화바륨, 바륨 티오설페이트, 바륨실리케이트, 칼슘하이드록사이드를 바륨 카보네이트 및 칼슘 카보네이트로 전환시키는데 화학양론적으로 필요한 양인 0.5-1.5배로 사용함을 특징으로 하는 방법.
  7. 전항의 어느 한항에 있어서, 알카리 카보네이트로서 나트륨 카보네이트를 사용함을 특징으로 하는 방법.
  8. 제1항에 있어서, 분리된 고체조성물은 한번이나 그 이상 물로 수세됨을 특징으로 하는 방법.
  9. 제1항에 있어서, 생성된 고체조성물은 건조됨을 특징으로 하는 방법.
  10. 전항의 어느 한항에 있어서, 바륨 카보네이트나 불활성 첨가제 특히 칼슘 카보네이트는 바륨 카보네이트의 양이 건조된 물질에 대하여 15-90wt%가 바람직하게는 40-50wt%가 될때까지 분리된 고체조성물에 첨가됨을 특징으로 하는 방법.
  11. 전황의 어느 한항에 있어서, 고체조성물을 세척하여 얻어진 세척용액과/또는 고체조성물을 분리하여 얻어진 황화알칼리를 포함하는 수용액은 여과액 잔사를 현탁시키고/또는 알칼리 카보네이트 수용액을 만들기 위해 전부 또는 부분적으로 재사용됨을 특징으로 하는 방법.
  12. 제1항 내지 제11항중의 어느 한 방법에 따라 얻어짐을 특징으로 하는 무기바륨 포함 고체조성물.
  13. 제12항에 있어서, 대체로 염소가 없으며 바륨 카보네이트로 표현되는 고체조성물은 염산에 용해되는 바륨화합물 성분이 15-90wt%, 바람직하게는 40-50%로 포함되고 요오드적정으로 환원물질 측정시 특히 환원 황화합물이 건조물질의 3wt%이하, 바람직하게는 0.1-2.5wt%로 포함됨을 특징으로 하는 고체조성물.
  14. 제12항이나 13항에 있어서, 물은 0-50wt% 포함됨을 특징으로 하는 고체조성물.
  15. 제12항 내지 14항의 어느 한 항에 있어서, 구워진 도기류를 제조하기 위해 첨가제로 사용함을 특징으로 하는 고체조성물의 사용방법.
  16. 제15항에 있어서, 첨가제는 설페이트를 포함하는 점토에 구워지지 않은 점토의 건조질량에 대하여 0.1-10wt%로 첨가됨을 특징으로 하는 방법.
  17. 제12항 내지 제14항의 고체조성물을 사용하여 제조됨을 특징으로 하는 도기류.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019900018489A 1989-12-21 1990-11-15 무기바륨을 포함하는 고체조성물의 제조방법 KR0146368B1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942242A DE3942242A1 (de) 1989-12-21 1989-12-21 Verfahren zur herstellung einer anorganischen, barium-haltigen feststoffzusammensetzung
DE3942242.9 1989-12-21

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KR910011687A true KR910011687A (ko) 1991-08-07
KR0146368B1 KR0146368B1 (ko) 1998-08-17

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US (1) US5207997A (ko)
EP (1) EP0433886B1 (ko)
JP (1) JP2994045B2 (ko)
KR (1) KR0146368B1 (ko)
BR (1) BR9006295A (ko)
CZ (1) CZ282626B6 (ko)
DE (2) DE3942242A1 (ko)
ES (1) ES2049903T3 (ko)
RO (1) RO109935B1 (ko)
TR (1) TR26213A (ko)

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Publication number Priority date Publication date Assignee Title
GB9400359D0 (en) * 1994-01-11 1994-03-09 Abr Foods Ltd Brick making additive
JP2007204323A (ja) * 2006-02-02 2007-08-16 Nikken Sekkei Ltd セラミックス建材及びその製造方法
CN104390882A (zh) * 2014-12-10 2015-03-04 内蒙古包钢钢联股份有限公司 一种一次沉淀测定硅钙钡中钡含量的方法
CN114349413B (zh) * 2022-03-18 2022-05-27 中国科学院生态环境研究中心 一种钡渣无害化资源化处理方法及制备的建筑材料

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1615515A (en) * 1922-01-04 1927-01-25 Rhenania Ver Chemischer Fab Ag Process for making barium carbonate
DE483514C (de) * 1922-07-31 1929-10-04 Kali Chemie Akt Ges Verfahren zur Gewinnung von wasserloeslichen Barium- und Strontiumsalzen aus den durch Auslaugen von Schwefelbarium und Schwefelstrontium befreiten Rueckstaenden der Schwefelbarium- und Schwefelstrontiumfabrikation
US1634338A (en) * 1924-11-18 1927-07-05 Jr James B Pierce Process of making precipitated barium carbonate and barium sulphydrate
US1697722A (en) * 1925-04-03 1929-01-01 Deguide Camille Process for recovering barium as barium carbonate from barium silicates
DE824792C (de) * 1950-05-09 1951-12-13 Kali Chemie Ag Verfahren zur Herstellung von Bariumcarbonat unter gleichzeitiger Gewinnung von Alkalinitraten
DE1177122B (de) * 1963-03-28 1964-09-03 Bayer Ag Verfahren zur Herstellung von Bariumkarbonat aus Bariumsulfat
US3467494A (en) * 1966-10-03 1969-09-16 Ppg Industries Inc Barium carbonate production
DE2034065C3 (de) * 1970-07-09 1975-08-28 Kali-Chemie Ag, 3000 Hannover Verfahren zur Aufarbeitung von Bariumsulfid-Auslaugrückständen unter Gewinnung löslicher Bariumverbindungen
US3869742A (en) * 1974-02-28 1975-03-11 Said James Douglas Thompson To Ladder and mounting for small boats
DD160591A3 (de) * 1978-10-16 1983-11-16 Fliesenwerke Kurt Buerger Boiz Keramische massen zur erhoehung der frost-, saeure- und laugenbestaendigkeit
DD224019A1 (de) * 1984-05-25 1985-06-26 Dessau Gaerungschemie Verfahren zur herstellung von schwefelarmen bariumcarbonat
DE3706533A1 (de) * 1986-06-16 1988-01-21 Babcock Anlagen Ag Verfahren zur ueberfuehrung von barium aus schwerspat in eine waessrige loesung

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EP0433886A1 (de) 1991-06-26
JP2994045B2 (ja) 1999-12-27
BR9006295A (pt) 1991-09-24
DE59004782D1 (de) 1994-04-07
ES2049903T3 (es) 1994-05-01
RO109935B1 (ro) 1995-07-28
CS647490A3 (en) 1992-04-15
US5207997A (en) 1993-05-04
JPH0492850A (ja) 1992-03-25
CZ282626B6 (cs) 1997-08-13
TR26213A (tr) 1995-02-15
KR0146368B1 (ko) 1998-08-17
EP0433886B1 (de) 1994-03-02
DE3942242A1 (de) 1991-06-27

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