JP6618853B2 - 炭酸カルシウム焼結体の製造方法 - Google Patents
炭酸カルシウム焼結体の製造方法 Download PDFInfo
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- JP6618853B2 JP6618853B2 JP2016108635A JP2016108635A JP6618853B2 JP 6618853 B2 JP6618853 B2 JP 6618853B2 JP 2016108635 A JP2016108635 A JP 2016108635A JP 2016108635 A JP2016108635 A JP 2016108635A JP 6618853 B2 JP6618853 B2 JP 6618853B2
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- calcium carbonate
- particle size
- sintering aid
- sintered body
- size distribution
- Prior art date
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims description 156
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims description 77
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000002245 particle Substances 0.000 claims description 60
- 238000005245 sintering Methods 0.000 claims description 43
- 238000009826 distribution Methods 0.000 claims description 34
- 239000000203 mixture Substances 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 14
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 12
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 12
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000011698 potassium fluoride Substances 0.000 claims description 6
- 235000003270 potassium fluoride Nutrition 0.000 claims description 6
- 239000011775 sodium fluoride Substances 0.000 claims description 6
- 235000013024 sodium fluoride Nutrition 0.000 claims description 6
- 238000000748 compression moulding Methods 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- 239000011575 calcium Substances 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 235000010216 calcium carbonate Nutrition 0.000 description 66
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 239000001569 carbon dioxide Substances 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000010304 firing Methods 0.000 description 6
- 238000000691 measurement method Methods 0.000 description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000000462 isostatic pressing Methods 0.000 description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000007088 Archimedes method Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000004455 differential thermal analysis Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011049 pearl Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
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- A01K61/57—Pearl seeds
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- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
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- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
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- C01F11/00—Compounds of calcium, strontium, or barium
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Description
本発明において用いる炭酸カルシウムは、炭酸カルシウム焼結体の製造に用いることができるものであれば特に限定されない。密度の高い成形体を作製することができるという観点からは、透過型電子顕微鏡観察により測定した粒子径分布における平均粒子径(D50)が0.05〜0.30μmの範囲内であり、レーザー回折式粒度分布測定法により測定した粒子径分布における90%粒子径(D90)が3μm以下であり、BET比表面積が5〜25m2/gである炭酸カルシウムが好ましい。
本発明において用いる焼結助剤は、炭酸カルシウムと、フッ化カリウム、フッ化リチウム及びフッ化ナトリウムの混合物であって融点が600℃以下である焼結助剤が用いられる。上記の結焼結助剤の融点は、550℃以下であることが好ましく、400〜500℃の範囲内であることがさらに好ましい。このような範囲とすることにより、より低い温度で焼成し、より高い密度の炭酸カルシウム焼結体を製造することができる。焼結の際には、炭酸カルシウムに添加して使用することから、実際の融点は上記の温度よりさらに低くなるため焼結助剤として十分に機能する。焼結助剤の融点は、示差熱分析(DTA)により求めることができる。
本発明においては、焼結助剤の含有割合が0.1〜3.0質量%となるように、炭酸カルシウムに焼結助剤を混合して混合物を調製する。焼結助剤の含有割合は、好ましくは0.2〜2.5質量%であり、さらに好ましくは0.3〜2.0質量%である。混合物中における焼結助剤の含有割合が少なすぎると、炭酸カルシウムが十分に焼結しない場合がある。焼結助剤の含有割合が多すぎると、炭酸カルシウム焼結体の密度を高めることができない場合がある。
本発明においては、上記混合物を圧縮成形して成形体を作製する。圧縮成形は、一軸成形であることが好ましい。本発明によれば、一軸成形による成形体を用いて、高い密度を有する炭酸カルシウム焼結体を製造することができる。しかしながら、本発明においては、一軸成形に限定されるものではなく、静水圧プレス成形、あるいはドクターブレード成形、鋳込み成形など他に知られた成形方法により成形体を作製してもよい。
本発明においては、上記の成形体を焼結することにより、炭酸カルシウム焼結体を製造する。より簡易な工程で焼結するという観点からは、焼結の際の雰囲気は、空気中であることが好ましい。しかしながら、本発明はこれに限定されるものではなく、従来と同様に、炭酸ガス雰囲気中、あるいは窒素ガスなどの不活性ガス雰囲気中で焼結してもよい。本発明によれば、空気中で焼結させても、高い密度を有する炭酸カルシウム焼結体を製造することができる。
表1及び表2に示す粒子径分布及びBET比表面積を有する炭酸カルシウムを製造した。平均粒子径(D50)が0.1μmを超える粒子については、特許第0995926号の製造方法に従い製造した。それ以外については、石灰乳に炭酸ガスを吹き込んで反応させる一般的な炭酸ガス化合法により製造した。なお、表1に示す実施例1〜3及び比較例1〜4では、同じ炭酸カルシウムを用いている。
得られた炭酸カルシウムについて、透過型電子顕微鏡観察により粒子径分布を測定した。測定対象である炭酸カルシウム粒子について、1500個の粒子径を測定し、粒子径分布から平均粒子径(D50)並びにD90、D10を求めた。各炭酸カルシウムの平均粒子径(D50)並びにD90、D10、及びD90/D10の値を表1及び表2に示した。
得られた炭酸カルシウムについて、レーザー回折式粒度分布測定法により粒子径分布を測定した。その具体的な測定方法は以下のように行なった。測定装置として(株)島津製作所製レーザー回折式粒度分布測定装置 SALDA−2000Jを用い、0.2%ヘキサメタリン酸ナトリウム溶液100mLに試料1gを加えた後サンプラに投入し、規定の吸光度に達した後、超音波を1分間照射し測定を行った。その測定した粒子径分布から、90%粒子径(D90)を求め、表1及び表2に示した。
得られた炭酸カルシウムについて、BET比表面積を測定し、結果を表1及び表2に示した。
各実施例では、フッ化物系焼結助剤を用いた。フッ化物系焼結助剤として、フッ化カリウムとフッ化リチウムとフッ化ナトリウムの混合物を用いた。混合割合は、モル比で、フッ化カリウム:フッ化リチウム:フッ化ナトリウム=40:49:11である。混合物の融点(共融温度)は、463℃である。
焼結助剤の含有量が表1及び表2に示す量となるように、焼結助剤と炭酸カルシウムとを混合した。この混合物を適量のジルコニアボールが入ったポリエチレン瓶に入れ、一晩乾式混合を行い、原料粉末とした。この原料粉末を円筒状の金型内に入れ、プレス機を用いて一軸プレス成形した。98Mpa(1000kgf/cm2)の成形圧で1分間予備プレス成形した後、196.1Mpa(2000kgf/cm2)の成形圧で1分間プレス成形した。
得られた成形体を、空気中で表1及び表2に示す焼成温度で3時間焼成した。なお、焼成温度に達するまで毎分10℃で昇温させた。この焼成により、炭酸カルシウム焼結体を得た。
アルキメデス法より成形体及び焼結体のかさ密度ρb[g/cm3]を求め、得られたかさ密度を炭酸カルシウムの理論密度(2.711g/cm3)で割り、その相対密度を求めた。成形体及び焼結体のかさ密度は、次のように求めた。先ず、成形体あるいは焼結体の試料の乾燥重量W1を測定し、湯煎したパラフィン中にその試料を10分程度静置した後、取り出して常温になるまで冷やした。冷めた後にパラフィンを含有した試料の重量W2を測定した。その後、その試料の水中重量W3を測定し、下記の式より試料のかさ密度ρbを求めた。
ρW:水の密度[g/cm3]
W1:試料の乾燥重量[g]
W2:パラフィンを含有した試料の重量[g]
W3:試料の水中重量[g]
Claims (6)
- 炭酸カルシウムと、フッ化カリウム、フッ化リチウム及びフッ化ナトリウムの混合物であって融点が600℃以下である焼結助剤とを準備する工程と、
前記焼結助剤が0.1〜3.0質量%となるように混合した前記炭酸カルシウムと前記焼結助剤の混合物を圧縮成形して成形体を作製する工程と、
前記成形体を焼結することにより、炭酸カルシウム焼結体を製造する工程とを備え、
前記炭酸カルシウムが、透過型電子顕微鏡観察により測定した粒子径分布における平均粒子径(D 50 )が0.05〜0.30μmの範囲内であり、レーザー回折式粒度分布測定法により測定した粒子径分布における90%粒子径(D 90 )が3μm以下であり、BET比表面積が5〜25m 2 /gである、炭酸カルシウム焼結体の製造方法。 - 前記成形体を380〜600℃で焼結する、請求項1に記載の炭酸カルシウム焼結体の製造方法。
- 前記圧縮成形が、一軸成形である、請求項1または2に記載の炭酸カルシウム焼結体の製造方法。
- 前記成形体を空気中で焼結する、請求項1〜3のいずれか一項に記載の炭酸カルシウム焼結体の製造方法。
- 前記炭酸カルシウムが、純度99質量%以上である、請求項1〜4のいずれか一項に記載の炭酸カルシウム焼結体の製造方法。
- 前記炭酸カルシウム焼結体の相対密度が95%以上である、請求項1〜5のいずれか一項に記載の炭酸カルシウム焼結体の製造方法。
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EP17806650.2A EP3466902A4 (en) | 2016-05-31 | 2017-05-30 | METHOD FOR PRODUCING A CALCIUM CARBONATE SINTER BODY |
PCT/JP2017/020011 WO2017209096A1 (ja) | 2016-05-31 | 2017-05-30 | 炭酸カルシウム焼結体の製造方法 |
US16/305,563 US20200331770A1 (en) | 2016-05-31 | 2017-05-30 | Method for producing calcium carbonate sintered compact |
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