JPH04219196A - Method for adding silver to calcium carbonate - Google Patents
Method for adding silver to calcium carbonateInfo
- Publication number
- JPH04219196A JPH04219196A JP7203991A JP7203991A JPH04219196A JP H04219196 A JPH04219196 A JP H04219196A JP 7203991 A JP7203991 A JP 7203991A JP 7203991 A JP7203991 A JP 7203991A JP H04219196 A JPH04219196 A JP H04219196A
- Authority
- JP
- Japan
- Prior art keywords
- silver
- calcium carbonate
- coral sand
- silver nitrate
- carbonate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 56
- 239000004332 silver Substances 0.000 title claims abstract description 40
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 40
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 14
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 43
- 235000014653 Carica parviflora Nutrition 0.000 claims abstract description 27
- 241000243321 Cnidaria Species 0.000 claims abstract description 27
- 239000004576 sand Substances 0.000 claims abstract description 27
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 238000007872 degassing Methods 0.000 claims 1
- 239000012629 purifying agent Substances 0.000 abstract description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 33
- 235000010216 calcium carbonate Nutrition 0.000 description 17
- LKZMBDSASOBTPN-UHFFFAOYSA-L silver carbonate Substances [Ag].[O-]C([O-])=O LKZMBDSASOBTPN-UHFFFAOYSA-L 0.000 description 14
- 239000000243 solution Substances 0.000 description 12
- ZXSQEZNORDWBGZ-UHFFFAOYSA-N 1,3-dihydropyrrolo[2,3-b]pyridin-2-one Chemical compound C1=CN=C2NC(=O)CC2=C1 ZXSQEZNORDWBGZ-UHFFFAOYSA-N 0.000 description 11
- 229910001958 silver carbonate Inorganic materials 0.000 description 11
- JCXJVPUVTGWSNB-UHFFFAOYSA-N Nitrogen dioxide Chemical compound O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003651 drinking water Substances 0.000 description 4
- 235000020188 drinking water Nutrition 0.000 description 4
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- WIKQEUJFZPCFNJ-UHFFFAOYSA-N carbonic acid;silver Chemical compound [Ag].[Ag].OC(O)=O WIKQEUJFZPCFNJ-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- KQTXIZHBFFWWFW-UHFFFAOYSA-L silver(I) carbonate Inorganic materials [Ag]OC(=O)O[Ag] KQTXIZHBFFWWFW-UHFFFAOYSA-L 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000001479 atomic absorption spectroscopy Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 229910001923 silver oxide Inorganic materials 0.000 description 2
- 229910000108 silver(I,III) oxide Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- SJABOPBQMBSERU-UHFFFAOYSA-M C(C)(=O)[O-].N.[Ag+] Chemical compound C(C)(=O)[O-].N.[Ag+] SJABOPBQMBSERU-UHFFFAOYSA-M 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241000237502 Ostreidae Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000816 effect on animals Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 235000020636 oyster Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Agricultural Chemicals And Associated Chemicals (AREA)
- Water Treatment By Sorption (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、近年水の浄化剤として
注目を浴びると共に、使用に供されている炭酸カルシウ
ムを含有するコーラルサンドにおいて、水等の殺菌の目
的にてその表面に銀を添加する方法の改良に関するもの
である。コーラルサンドは、一般の炭酸カルシウムと異
なり多孔質で、水との接触面積が非常に広い物質である
。[Industrial Application Field] The present invention has attracted attention in recent years as a water purifying agent, and the present invention is applied to coral sand containing calcium carbonate, which has been used for the purpose of sterilizing water. The present invention relates to an improvement in the method of addition. Unlike ordinary calcium carbonate, coral sand is porous and has a very large contact area with water.
【０００２】0002
【従来技術】活性炭、珊瑚砂等の基剤の表面に銀を添加
したものが水の浄化剤として浄水器に充填されて使用に
供されている。これら基剤への銀の添加方法としては以
下に示すような方法が知られている。硝酸銀水溶液にア
ンモニア水を加え、銀アンモニア酢酸塩を作り、これに
コーラルサンドを浸漬させた後にホルマリン、グルコー
ス等の還元液を添加し、銀をコーラルサンド上に析出さ
せる、いわゆる銀鏡反応による方法が知られている（特
公昭６０−３３４０３号）。BACKGROUND OF THE INVENTION A base material such as activated carbon or coral sand with silver added to its surface is used as a water purifying agent by filling it into a water purifier. The following methods are known as methods for adding silver to these bases. A method using the so-called silver mirror reaction involves adding ammonia water to an aqueous silver nitrate solution to make silver ammonia acetate, immersing coral sand in this, and then adding a reducing solution such as formalin or glucose to precipitate silver on the coral sand. It is known (Special Publication No. 60-33403).
【０００３】また他の添加方法として、珊瑚砂を硝酸銀
水溶液に浸し、表面を炭酸銀で覆われたものとした後に
、過酸化水素水を注加して炭酸銀を銀に還元する方法が
発明され知られている（特公昭６３−３４２２８号）。Another method of addition is to soak coral sand in a silver nitrate aqueous solution to coat the surface with silver carbonate, and then add hydrogen peroxide solution to reduce the silver carbonate to silver. It is known as (Special Publication No. 63-34228).
【０００４】0004
【発明が解決しようとする課題】しかしながらかかる従
来技術の場合は、以下に示すような問題があり使用に対
する問題点を有していた。銀鏡反応による場合は、まず
還元反応を起こさせる為に各種試薬の添加量や温度条件
に合わせるための操作が複雑であると共に、還元された
銀が珊瑚砂ばかりでなく容器にまで付着するために銀の
添加効率が悪いという欠点がある。However, in the case of such prior art, there are problems as shown below, and there are problems in use. In the case of silver mirror reaction, first of all, in order to cause the reduction reaction, operations to adjust the amount of various reagents added and temperature conditions are complicated, and the reduced silver adheres not only to the coral sand but also to the container. The disadvantage is that the silver addition efficiency is low.
【０００５】さらに添加試薬としてアンモニアを使用す
るが、このアンモニアは僅かに残存していても悪臭の原
因になりやすく、飲料水の浄化剤として基剤への銀の添
加に使用するには相応しくない。Furthermore, ammonia is used as an additive reagent, but even a small amount of ammonia remaining tends to cause a bad odor, and it is not suitable for use as a drinking water purifying agent for adding silver to the base material. .
【０００６】また硝酸銀を炭酸銀にした後に過酸化水素
水にて銀を還元する場合は、アンモニア水を使用しない
という点において悪臭の面の不都合が解消されてはいる
ものの、過酸化水素水は漂白剤にも使用される物質であ
り、この物質が動物等に悪影響を及ぼすということで使
用されなくなった事実からして、添加剤（還元剤）とし
て飲料水の浄化剤に使用することに若干の問題を有して
いる。[0006] Furthermore, when silver nitrate is converted into silver carbonate and then silver is reduced with a hydrogen peroxide solution, the problem of bad odor is solved because ammonia water is not used, but the hydrogen peroxide solution is This substance is also used in bleach, and given the fact that it is no longer used because it has a negative effect on animals, there is some controversy over its use as an additive (reducing agent) in drinking water purification agents. I have this problem.
【０００７】そこで本発明は、かかる従来技術の欠点に
鑑み飲料水の浄化剤への銀の添加が可能で、かつ例え添
加剤が残存しても安全性に富む炭酸カルシウムへの銀の
添加方法を提供することを目的とする。In view of the drawbacks of the prior art, the present invention provides a method for adding silver to calcium carbonate that allows silver to be added to a purifying agent for drinking water and is highly safe even if the additive remains. The purpose is to provide
【０００８】[0008]
【課題を解決するための手段】すなわち本発明は、つぎ
の（ａ）及び（ｂ）の各工程、
（ａ）コーラルサンド等の炭酸カルシウムを硝酸銀水溶
液に長時間浸漬させると共に脱気しながら充分に接触せ
しめる工程と、
（ｂ）硝酸銀水溶液より取り出した後水切りし、炭酸カ
ルシウムを空気中又は窒素気流中で均一に２００℃以上
の温度にて加熱しつつ直接銀に還元添加させる工程、と
からなる炭酸カルシウムへの銀の添加方法により本目的
を達成しする。[Means for Solving the Problems] That is, the present invention includes the following steps (a) and (b): (a) Calcium carbonate such as coral sand is immersed in an aqueous silver nitrate solution for a long time and thoroughly degassed. (b) removing water from the silver nitrate aqueous solution, draining it, and directly reducing and adding calcium carbonate to silver while uniformly heating it in air or a nitrogen stream at a temperature of 200°C or higher. This object is achieved by a method of adding silver to calcium carbonate.
【０００９】またコーラルサンドは一般に多孔質である
ために孔の部分に空気を含んでいる可能性があり、該空
気が含まれていると表面全体への銀の添加が出来ないと
考え、（ａ）の工程において、炭酸カルシウムの層の底
部より上昇流として硝酸銀溶液を注入する方法により炭
酸カルシウム中の微細孔中の空気を取り除く方法を発明
したものである。[0009] Also, since coral sand is generally porous, there is a possibility that the pores contain air, and if this air is contained, silver cannot be added to the entire surface. In step a), a method has been invented in which air in micropores in calcium carbonate is removed by injecting a silver nitrate solution in an upward flow from the bottom of the calcium carbonate layer.
【００１０】尚、微細孔を有する炭酸カルシウムとして
はコーラルサンドが好ましいが、その他の炭酸カルシウ
ムとして例示するとカキ貝殻やカニ甲羅等が挙げられる
。還元のための加熱温度としては、３００〜４００℃が
好ましい。[0010] Preferably, the calcium carbonate having micropores is coral sand, but other examples of calcium carbonate include oyster shells and crab shells. The heating temperature for reduction is preferably 300 to 400°C.
【００１１】[0011]
【作用】本発明における（ａ）の工程において、炭酸銀
を主成分とする炭酸カルシウムの表面全てが硝酸銀溶液
と接触することになり、表面部分の炭酸カルシウムが硝
酸銀と反応して炭酸銀となると共に、一部は微細孔中に
硝酸銀溶液が残存する。
ＣａＣＯ３＋２ＡｇＮＯ３→Ａｇ２ＣＯ３↓＋Ｃａ（Ｎ
Ｏ３）２ そして、（ａ）の炭酸カルシウム及び微細
孔中に硝酸銀を１６０〜４００℃で加熱すると、以下に
示すような反応により銀が析出される。[Operation] In step (a) of the present invention, the entire surface of calcium carbonate whose main component is silver carbonate comes into contact with the silver nitrate solution, and the calcium carbonate on the surface reacts with silver nitrate to become silver carbonate. At the same time, some of the silver nitrate solution remains in the micropores. CaCO3+2AgNO3→Ag2CO3↓+Ca(N
O3)2 Then, when silver nitrate is heated in the calcium carbonate and micropores of (a) at 160 to 400°C, silver is precipitated by the reaction shown below.
【００１２】（炭酸銀の場合）
Ａｇ２ＣＯ３→Ａｇ２Ｏ＋ＣＯ２↑ （７５８ｍｍＨ
ｇ，２１８℃）Ａｇ２Ｏ→２Ａｇ＋１／２Ｏ２↑ （
７６０ｍｍＨｇ，１６０℃以上）(In the case of silver carbonate) Ag2CO3→Ag2O+CO2↑ (758mmH
g, 218℃) Ag2O→2Ag+1/2O2↑ (
760mmHg, 160℃ or higher)
【００１３】（硝酸銀
の場合）
ＡｇＮＯ３→ＡｇＮＯ２＋１／２Ｏ２↑ＡｇＮＯ２→Ａ
ｇ＋ＮＯ２↑ （７６０ｍｍＨｇ，ｍ．ｐ．２１
２℃）
また発生した二酸化窒素は、加熱されて一酸化窒素及び
酸素となる。
ＮＯ２→ＮＯ↑＋１／２Ｏ２↑
（炭酸カルシウムの場合）
ＣａＣＯ３→ＣａＯ＋ＣＯ２↑ （７６０ｍｍＨ
ｇ，８９８℃）以下に本発明を実施例に従って詳細に説
明する。(In case of silver nitrate) AgNO3→AgNO2+1/2O2↑AgNO2→A
g+NO2↑ (760mmHg, m.p.21
2°C) Also, the generated nitrogen dioxide is heated and becomes nitrogen monoxide and oxygen. NO2→NO↑+1/2O2↑ (in case of calcium carbonate) CaCO3→CaO+CO2↑ (760mmH
(g, 898° C.) The present invention will be described in detail below with reference to Examples.
【００１４】[0014]
【実施例１】水洗、脱塩したコーラルサンド１０ｇを濃
度０．５８９ｍｏｌ／リットルの硝酸銀溶液１０ｍｌに
５０〜７０℃の温浴にて２０時間浸漬させた。浸漬させ
たコーラルサンドを水切りした後に、このコーラルサン
ドを窒素気流中にて２５０℃に加熱することにより銀に
還元させ、コーラルサンド表面に銀を添加させた。Example 1 10 g of washed and desalted coral sand was immersed in 10 ml of a silver nitrate solution having a concentration of 0.589 mol/liter in a hot bath at 50 to 70° C. for 20 hours. After draining the immersed coral sand, the coral sand was heated to 250° C. in a nitrogen stream to be reduced to silver, and silver was added to the surface of the coral sand.
【００１５】[0015]
【実施例２】水洗、脱塩したコーラルサンド１０ｇを濃
度０．５８９ｍｏｌ／リットルの硝酸銀溶液１０ｍｌに
５０〜７０℃の温浴にて１０時間浸漬させた。浸漬させ
たコーラルサンドを水切りした後に、このコーラルサン
ドを窒素気流中にて２００℃に加熱することにより銀に
還元させ、コーラルサンド表面に銀を添加させた。Example 2 10 g of washed and desalted coral sand was immersed in 10 ml of a silver nitrate solution having a concentration of 0.589 mol/liter in a hot bath at 50 to 70° C. for 10 hours. After draining the immersed coral sand, the coral sand was heated to 200° C. in a nitrogen stream to be reduced to silver, and silver was added to the surface of the coral sand.
【００１６】（確認試験）実施例１及び実施例２で示し
た方法にて銀を添加した場合、理論的に硝酸銀の銀全て
がコーラルサンド（炭酸カルシウム１００％からなると
仮定）に付着したと仮定した場合には、０．５８９ｍｏ
ｌ／リットル×０．０１リットル×１０７．９ｇ／ｍｏ
ｌ＝０．６３５ｇの銀が付着することになる。(Confirmation test) When silver is added by the method shown in Examples 1 and 2, it is assumed that all the silver in the silver nitrate is theoretically attached to the coral sand (assumed to be composed of 100% calcium carbonate). In that case, 0.589mo
l/liter x 0.01 liter x 107.9g/mo
l=0.635g of silver will be deposited.
【００１７】しかしながら実際は、浸漬の過程及び洗浄
の過程において一部が流出したり、反応に供しない物質
もあるので、銀の付着率は理論値よりも悪くなる。そこ
でコーラルサンドに付着した銀の添加量について以下に
示す方法にて確認したところ、表１に示す通りとなった
。
（試験方法）試料１ｇを細かく粉砕したものを硝酸液に
浸し、さらに加熱して溶解させた後に濾過した液に精製
水を加えて１００ｍｌとし、その溶液について原子吸光
分析により銀の添加量を測定した。However, in reality, some of the materials flow out during the immersion and washing steps, and some substances are not subjected to the reaction, so that the silver deposition rate is worse than the theoretical value. Therefore, when the amount of silver adhering to the coral sand was confirmed using the method shown below, the results were as shown in Table 1. (Test method) Finely ground 1 g of sample is immersed in nitric acid solution, further heated to dissolve, then purified water is added to the filtered solution to make 100 ml, and the amount of silver added to the solution is measured by atomic absorption spectrometry. did.
【００１８】[0018]
【表１】[Table 1]
【００１９】以下の表２に示すような略一定量のコーラ
ルサンドを様々な濃度の硝酸銀溶液（１００ｍｌ）に１
０時間又は２０時間浸漬させ、その後空気中で様々な温
度にて１時間以上加熱還元させたコーラルサンドへの銀
の添加量を調べた。尚、銀の添加量については前述同様
原子吸光分析により行った。[0019] Approximately constant amounts of coral sand as shown in Table 2 below were added to silver nitrate solutions (100 ml) of various concentrations.
The amount of silver added to coral sand that had been immersed for 0 or 20 hours and then heated and reduced in air at various temperatures for 1 hour or more was investigated. The amount of silver added was determined by atomic absorption spectrometry as described above.
【００２０】[0020]
【表２】[Table 2]
【００２１】コーラルサンドに付着した化合物を分析し
たところ、試料１，３，４，５，６，１１，１２に付着
したものは炭酸銀（黄色）であり、試料２，７，８，９
，１０に付着したものは酸化銀又は銀（暗褐色又は白）
であることが判明した。特に４００℃で加熱したものは
炭酸銀の全てが銀に還元されていることが判明した。次
に炭酸銀（Ａｇ２ＣＯ３）の各温度における炭酸銀、酸
化銀又は銀の含有率を調べたところ以下の表３に示す通
りとなった。[0021] When the compounds attached to the coral sand were analyzed, the compounds attached to samples 1, 3, 4, 5, 6, 11, and 12 were silver carbonate (yellow), and those attached to samples 2, 7, 8, and 9
, 10 is silver oxide or silver (dark brown or white)
It turned out to be. In particular, it was found that all of the silver carbonate was reduced to silver when heated at 400°C. Next, the content of silver carbonate, silver oxide, or silver at each temperature of silver carbonate (Ag2CO3) was investigated, and the results were as shown in Table 3 below.
【００２２】[0022]
【表３】[Table 3]
【００２３】[0023]
【効果】以上述べたように本発明にかかる銀の添加方法
は、従来の方法に比較して、炭酸銀を書ていの温度にて
加熱させることにより還元させ、コーラルサンドに銀を
付着させることができるために、このコーラルサンドを
飲料水の浄化剤として利用しても安全である。[Effects] As described above, compared to the conventional method, the method of adding silver according to the present invention reduces silver carbonate by heating it at the specified temperature, and allows silver to adhere to coral sand. Therefore, it is safe to use this coral sand as a purifying agent for drinking water.
Claims (2)
）コーラルサンド等の炭酸カルシウムを硝酸銀水溶液に
長時間浸漬させると共に脱気しながら充分に接触せしめ
る工程と、 （ｂ）硝酸銀水溶液より取り出した後水切りし、炭酸カ
ルシウムを空気中又は窒素気流中で均一に２００℃以上
の温度にて加熱しつつ直接銀に還元添加させる工程、と
からなる炭酸カルシウムへの銀の添加方法。Claim 1: Each of the following steps (a) and (b), (a
) immersing calcium carbonate such as coral sand in an aqueous silver nitrate solution for a long period of time and thoroughly contacting it while degassing; (b) removing water from the aqueous silver nitrate solution and draining it to uniformly distribute the calcium carbonate in air or in a nitrogen stream. A method for adding silver to calcium carbonate, which comprises the steps of directly reducing and adding silver to silver while heating at a temperature of 200° C. or higher.
層の底部より上昇流として硝酸銀溶液を注入することを
特徴とする請求項１記載の炭酸カルシウムへの銀の添加
方法。2. The method for adding silver to calcium carbonate according to claim 1, wherein in step (a), the silver nitrate solution is injected in an upward flow from the bottom of the calcium carbonate layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3072039A JPH0673665B2 (en) | 1990-03-28 | 1991-03-13 | How to add silver to calcium carbonate |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2-79530 | 1990-03-28 | ||
| JP7953090 | 1990-03-28 | ||
| JP3072039A JPH0673665B2 (en) | 1990-03-28 | 1991-03-13 | How to add silver to calcium carbonate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04219196A true JPH04219196A (en) | 1992-08-10 |
| JPH0673665B2 JPH0673665B2 (en) | 1994-09-21 |
Family
ID=26413167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3072039A Expired - Lifetime JPH0673665B2 (en) | 1990-03-28 | 1991-03-13 | How to add silver to calcium carbonate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0673665B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100349611B1 (en) * | 2000-05-18 | 2002-08-21 | (주)대동 에이씨 | Method of preparing water-purifying agent supported with silver |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6334228A (en) * | 1986-07-30 | 1988-02-13 | Honda Motor Co Ltd | Tractor power transmission system |
| JPH0411988A (en) * | 1989-10-03 | 1992-01-16 | Nissho:Kk | Production of purifying agent for sterilization |
-
1991
- 1991-03-13 JP JP3072039A patent/JPH0673665B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6334228A (en) * | 1986-07-30 | 1988-02-13 | Honda Motor Co Ltd | Tractor power transmission system |
| JPH0411988A (en) * | 1989-10-03 | 1992-01-16 | Nissho:Kk | Production of purifying agent for sterilization |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100349611B1 (en) * | 2000-05-18 | 2002-08-21 | (주)대동 에이씨 | Method of preparing water-purifying agent supported with silver |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0673665B2 (en) | 1994-09-21 |
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