JPH01226716A - Production of granular carbonate from caustic alkali - Google Patents
Production of granular carbonate from caustic alkaliInfo
- Publication number
- JPH01226716A JPH01226716A JP4983188A JP4983188A JPH01226716A JP H01226716 A JPH01226716 A JP H01226716A JP 4983188 A JP4983188 A JP 4983188A JP 4983188 A JP4983188 A JP 4983188A JP H01226716 A JPH01226716 A JP H01226716A
- Authority
- JP
- Japan
- Prior art keywords
- carbonate
- caustic alkali
- granular
- granules
- particle size
- 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.)
- Pending
Links
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 62
- 239000003513 alkali Substances 0.000 title claims abstract description 32
- 239000003518 caustics Substances 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000008187 granular material Substances 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 36
- 239000007864 aqueous solution Substances 0.000 claims description 20
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 18
- 239000001569 carbon dioxide Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 abstract description 43
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 24
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 8
- 238000002156 mixing Methods 0.000 abstract description 5
- 229910000288 alkali metal carbonate Inorganic materials 0.000 abstract description 4
- 150000008041 alkali metal carbonates Chemical class 0.000 abstract description 4
- 150000004682 monohydrates Chemical class 0.000 abstract 1
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract 1
- 238000005469 granulation Methods 0.000 description 17
- 230000003179 granulation Effects 0.000 description 17
- 238000000034 method Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 10
- 229910052783 alkali metal Inorganic materials 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 9
- 150000001340 alkali metals Chemical class 0.000 description 8
- 239000011163 secondary particle Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- -1 carbonated and dried Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical class OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 125000005587 carbonate group Chemical group 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- MQRJBSHKWOFOGF-UHFFFAOYSA-L disodium;carbonate;hydrate Chemical compound O.[Na+].[Na+].[O-]C([O-])=O MQRJBSHKWOFOGF-UHFFFAOYSA-L 0.000 description 2
- 229940076133 sodium carbonate monohydrate Drugs 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 1
- DFGKGUXTPFWHIX-UHFFFAOYSA-N 6-[2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]acetyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)C1=CC2=C(NC(O2)=O)C=C1 DFGKGUXTPFWHIX-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/07—Preparation from the hydroxides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、か性アルカリ水溶液から、形状の良い粒状炭
酸塩を製造する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing well-shaped granular carbonate from a caustic alkali aqueous solution.
［従来の技術］
か性アルカリを炭酸化してアルカリ金属炭酸塩を製造す
る方法として、従来、か性アルカリ水溶液中に炭酸ガス
を導入し、炭酸塩を晶析させ、その塩を分離乾燥する方
法、あるいはか性アルカリ水溶液を炭酸ガス雰囲気中に
噴霧し、炭酸化しかつ乾燥させる方法、か性アルカリ水
溶液を噴霧して炭酸ガス雰囲気中で炭酸化しつつ、流動
層造粒法により造粒して粒状の炭酸塩を得る方法が知ら
れている。[Prior Art] A conventional method for producing alkali metal carbonate by carbonating a caustic alkali is to introduce carbon dioxide gas into a caustic alkali aqueous solution, crystallize the carbonate, and separate and dry the salt. Alternatively, a caustic alkali aqueous solution is sprayed into a carbon dioxide atmosphere, carbonated and dried, or a caustic alkali aqueous solution is sprayed and carbonated in a carbon dioxide atmosphere, and then granulated using a fluidized bed granulation method. It is known how to obtain carbonates of
［発明の解決しようとする課題］
アルカリ金属炭酸塩は、粒径のそろった粒状のものが、
取り扱い性が良好な点で望まれる。[Problems to be solved by the invention] Alkali metal carbonates are granular with uniform particle sizes.
Desired for its ease of handling.
水溶液から晶析させる方法によれば、晶析条件を制御す
ることによりある程度粒径を制御することができるが、
精密な条件管理が要求され、かつ得られる粒子の大きさ
に限度があった。炭酸ガス気流中に水溶液を噴霧する方
法では、微細な粒子しか得られず、流動層を用いて、造
粒しつつ炭酸化を行う方法では、ある程度粒径の大きな
粒子は得られるものの、密度が高く溶解性の悪い粒子し
か得られなかった。According to the method of crystallizing from an aqueous solution, the particle size can be controlled to some extent by controlling the crystallization conditions, but
Precise control of conditions was required, and there was a limit to the size of particles that could be obtained. The method of spraying an aqueous solution into a carbon dioxide gas stream yields only fine particles, while the method of carbonating while granulating using a fluidized bed yields particles with a somewhat large particle size, but the density is low. Only particles with high solubility and poor solubility were obtained.
［課題を解決するための手段］
本発明者は、か性アルカリを炭酸化して、粒径のそろっ
た粒状のアルカリ金属炭酸塩を製造する方法を種々検討
した結果、か性アルカリに炭酸塩粉末を加えて造粒した
後炭酸化を行うことにより、造粒した形状を保ったまま
炭酸塩が得られることを見出した。[Means for Solving the Problems] As a result of various studies on methods for carbonating a caustic alkali to produce granular alkali metal carbonates with uniform particle sizes, the present inventor found that carbonate powder can be added to a caustic alkali. It has been found that carbonate can be obtained while maintaining the granulated shape by adding and granulating it and then carbonating it.
かくして、本発明は、か性アルカリ水溶液と炭酸塩粉末
を混合造粒した後、か性アルカリの炭酸化を行う粒状炭
酸塩の製造方法を提供するものである。Thus, the present invention provides a method for producing granular carbonate in which a caustic alkali aqueous solution and carbonate powder are mixed and granulated, and then the caustic alkali is carbonated.
なお、本明細占では、造粒の目的でか性アルカリ水溶液
に混合される炭酸塩を炭酸塩粉末、造粒の結果得られた
粒子を造粒物、造粒物中のか性アルカリを炭酸化した後
の粒子を、粒状炭酸塩と称する。また、本発明では、炭
酸塩とは、炭酸根を含む塩を表わし、正塩だけでなく、
炭酸水素塩や水酸化物を含む塩およびこれらの混合物を
も意味する。In this specification, the carbonate mixed into the caustic alkali aqueous solution for the purpose of granulation is referred to as carbonate powder, the particles obtained as a result of granulation are referred to as granules, and the caustic alkali in the granules is referred to as carbonate. The resulting particles are referred to as particulate carbonate. In addition, in the present invention, carbonate refers to a salt containing a carbonate group, and includes not only a normal salt, but also a salt containing a carbonate group.
It also refers to salts, including bicarbonates and hydroxides, and mixtures thereof.
本発明においては、か性アルカリ水溶液と炭酸塩粉末を
混合造粒して得た造粒物を炭酸化するので、造粒物と同
じ形状の粒径のそろった粒状炭酸塩が得られる。炭酸塩
粒子は、造粒時に加えた炭酸塩に帰因する結晶粒子を、
か性アルカリの炭酸化により得られた炭酸塩結晶が結合
した構造の２次粒子であり、気孔を含んだ多孔質構造を
有している。In the present invention, since the granules obtained by mixing and granulating a caustic alkali aqueous solution and carbonate powder are carbonated, granular carbonate having the same shape and uniform particle size as the granules can be obtained. Carbonate particles are crystal particles resulting from carbonate added during granulation.
It is a secondary particle with a structure in which carbonate crystals obtained by carbonation of a caustic alkali are combined, and has a porous structure containing pores.
本発明では、造粒物において含まれる自由水の量が０．
１〜１０重量％にするのが好ましい。自由水の量が０．
１重量％未満の場合は、造粒操作が困難でかつ、造粒物
の強度が低くなるおそれがあるので好ましくない。自由
水の量が１０重量％を超える場合は、造粒物どうしが固
着するおそれがあり、また、乾燥に要する熱量と時間が
多くなるので好ましくない。特に好ましい自由水の量は
３〜７重量％である。In the present invention, the amount of free water contained in the granules is 0.
It is preferably 1 to 10% by weight. The amount of free water is 0.
If it is less than 1% by weight, the granulation operation will be difficult and the strength of the granulated product may decrease, which is not preferable. If the amount of free water exceeds 10% by weight, the granules may stick to each other, and the amount of heat and time required for drying will increase, which is not preferable. A particularly preferred amount of free water is 3 to 7% by weight.
か性アルカリ水溶液の濃度は３〜７０重量％であること
が好ましい。濃度が３重量％未満の場合は、粒状炭酸塩
の粒子強度が弱くなるおそれがあり、また混合される炭
酸塩粉末の使用量が不必要に多くなるので好ましくない
。濃度が７０重量％を超える場合は、水溶液の粘度が高
くなり造粒操作が困難になるおそれがあるので好ましく
ない。特に好ましいか性アルカリ水溶液の濃度は２５〜
５０重量％である。The concentration of the caustic alkali aqueous solution is preferably 3 to 70% by weight. If the concentration is less than 3% by weight, the particle strength of the granular carbonate may be weakened, and the amount of carbonate powder to be mixed becomes unnecessarily large, which is not preferable. If the concentration exceeds 70% by weight, the viscosity of the aqueous solution may increase, making granulation operation difficult, which is not preferable. The concentration of the particularly preferred caustic alkali aqueous solution is 25~
It is 50% by weight.
本発明においては、か性アルカリにおいても炭酸塩粉末
においても、含まれるアルカリ金属は特に限定されるも
のではない。また、目的とする粒状炭酸塩が、複数のア
ルカリ金属を含むものである場合は、か性アルカリと炭
酸塩粉末で含まれるアルカリ金属が異なっていても良く
、それぞれが複数のアルカリ金属を含むものであっても
良い。目的とする粒状炭酸塩が、１種類のアルカリ金属
を含むものである場合は、当然に、か性アルカリと炭酸
塩粉末は、同一のアルカリ金属を含むものでなければな
らない。In the present invention, the alkali metal contained in both the caustic alkali and the carbonate powder is not particularly limited. In addition, if the target granular carbonate contains multiple alkali metals, the caustic alkali and the carbonate powder may contain different alkali metals, and each of them may contain multiple alkali metals. It's okay. When the target granular carbonate contains one type of alkali metal, naturally the caustic alkali and the carbonate powder must contain the same alkali metal.
造粒時に混合される炭酸塩粉末は、炭酸根を含むアルカ
リ金属塩であれば良く、種々の炭酸化度の塩を用いるこ
とができる。これらの塩としては正炭酸塩、炭酸水素塩
、セスキ炭酸塩などが挙げられる。また、これらの混合
物を用いることもできる。The carbonate powder mixed during granulation may be any alkali metal salt containing a carbonate radical, and salts with various degrees of carbonation can be used. These salts include orthocarbonates, hydrogen carbonates, sesquicarbonates, and the like. Moreover, a mixture of these can also be used.
この炭酸塩粉末は、１次粒子だけに限らず、２次粒子で
あっても良い。また、それ自信が造粒されたものであっ
ても良い。This carbonate powder is not limited to primary particles, but may also be secondary particles. Further, it may also be granulated.
造粒方法は特に限定されず、目的とする粒子形状に応じ
て、例えば、押し出し造粒法、転勤造粒法、流動層造粒
法などの方法か適用できる。押し出し造粒法、転勤造粒
法は、粒子径が調節しやすいので好ましい。押し出し造
粒法は、ダイスの断面形状を選ぶことにより、円柱状、
三角柱状、四角柱状などの種々の形状の粒子が得られ、
粒子の長さも制御しやすいので特に好ましい。The granulation method is not particularly limited, and depending on the desired particle shape, methods such as extrusion granulation, transfer granulation, and fluidized bed granulation can be applied. Extrusion granulation method and transfer granulation method are preferred because the particle size can be easily adjusted. In the extrusion granulation method, by selecting the cross-sectional shape of the die, cylindrical,
Particles of various shapes such as triangular prisms and quadrangular prisms can be obtained.
This is particularly preferred since the length of the particles can also be easily controlled.
造粒物の炭酸化方法としては、種々の方法を採用し得る
が、炭酸ガス雰囲気中で、造粒物を加熱処理する方法の
場合は、炭酸ガス濃度、処理温度、処理時間を変えるこ
とにより炭酸化の度合いを制御できるので好ましい。こ
の処理にあたっては、バンド乾燥器、回分式箱型乾燥器
、円盤乾燥器、回転乾燥器などの乾燥器中で、炭酸ガス
を含む気体を導入しつつ造粒物を加熱して炭酸ガスと反
応せしめる方式が好適に採用できる。この時、造粒物中
の水分を同時に揮発させ、粒状炭酸塩の乾燥も行うこと
ができる。さらに残った水分や、結晶水を取り除く必要
がある場合は、このあと乾燥あるいはか焼することによ
り目的の炭酸塩が得られる。Various methods can be used to carbonate the granules, but in the case of a method in which the granules are heat-treated in a carbon dioxide atmosphere, carbonation can be carried out by changing the carbon dioxide concentration, treatment temperature, and treatment time. This is preferred because the degree of carbonation can be controlled. In this process, the granules are heated in a dryer such as a band dryer, batch type box dryer, disk dryer, or rotary dryer while introducing a gas containing carbon dioxide gas to react with the carbon dioxide gas. A method of forcing can be suitably adopted. At this time, the moisture in the granules can be simultaneously volatilized and the granular carbonate can also be dried. If it is necessary to remove remaining moisture or water of crystallization, the desired carbonate can be obtained by drying or calcination.
また、炭酸塩粉末として、炭酸水素塩のように、アルカ
リ金属成分に対して、ＣＬ酸成分相対的に多く含まれる
塩を用いた場合は、この塩中に含まれるＣ０２によりか
性アルカリの一部を炭酸化することができる。この場合
、造粒および炭酸化度の制御を容易に行うために、か性
アルカリを過剰に加えて造粒した後、過剰のか性アルカ
リを上述のように炭酸ガス等で炭酸化する必要がある。In addition, when using a salt containing a relatively large amount of CL acid component relative to the alkali metal component, such as hydrogen carbonate, as the carbonate powder, the CO2 contained in this salt will increase the part can be carbonated. In this case, in order to easily control granulation and carbonation degree, it is necessary to add an excess amount of caustic alkali and granulate it, and then carbonate the excess caustic alkali with carbon dioxide gas etc. as described above. .
炭酸ガスによる炭酸化を行う場合は、造粒に用いる炭酸
塩粉末として、炭酸化処理後の粒状炭酸塩の一部を、粉
砕して循環使用することにより、系外から特に炭酸塩粉
末を供給しなくとも、か性アルカリのみから炭酸塩の製
造が可能である。または、造粒に用いる炭酸塩粉末は、
微細なものであれば特に粒子形状は問われないので別途
か性アルカリ水溶液を、例えば簡単な晶析装置中で攪拌
状態で炭酸ガスと反応せしめるか、あるいは該水溶液を
噴霧して炭酸化したり、流動層中で炭酸化するなどして
、炭酸塩を得て、これを適宜粉砕したものを用いれば、
他に炭酸塩を供給する必要がない。When carbonation is performed using carbon dioxide gas, a part of the granular carbonate after carbonation treatment is crushed and reused as the carbonate powder used for granulation, thereby supplying carbonate powder from outside the system. Even if carbonate is not used, it is possible to produce carbonate only from caustic alkali. Alternatively, the carbonate powder used for granulation is
The shape of the particles does not matter as long as they are fine, so a caustic alkaline aqueous solution is reacted with carbon dioxide gas under stirring in a simple crystallizer, or the aqueous solution is carbonated by spraying. If carbonate is obtained by carbonation in a fluidized bed, and the carbonate is appropriately pulverized,
No other carbonate needs to be supplied.
以下、本発明の製造方法を、実施例によりさ。The manufacturing method of the present invention will be described below with reference to Examples.
らに詳しく説明するが、本発明は実施例にある炭酸ソー
ダの製造法に限定されるものではなく、他の炭酸化度の
炭酸塩あるいは他のアルカリ金属の炭酸塩にも同様に適
用できるものである。As will be explained in more detail, the present invention is not limited to the method for producing soda carbonate shown in the examples, but can be similarly applied to carbonates with other degrees of carbonation or carbonates of other alkali metals. It is.
［実施例］
実施例１
平均粒径４０μｍに粉砕された炭酸ソーダ１水塩１０ｋ
ｇに、４８重量％の水酸化ナトリウム水溶液１、０ｋｇ
を加え、水平軸回転型混合機で混合し、さらに双軸型造
粒機を用いて平均粒径４３０ ｐｍの粒子に造粒した。[Example] Example 1 10k of sodium carbonate monohydrate pulverized to an average particle size of 40 μm
g, 1.0 kg of 48% by weight aqueous sodium hydroxide solution
were added, mixed using a horizontal shaft rotating mixer, and further granulated using a twin-screw granulator to obtain particles with an average particle size of 430 pm.
次いで、この粒子を熱風循環型乾燥機に入れ、炭酸ガス
５体積％雰囲気中（残りは空気）で、温度８０℃に３時
間保持して、炭酸化および乾燥を行い、粒状物を得た。Next, the particles were placed in a hot air circulation dryer and maintained at a temperature of 80° C. for 3 hours in an atmosphere containing 5% by volume of carbon dioxide gas (the remainder being air) to perform carbonation and drying, thereby obtaining granules.
かくして得られた粒状物は、円筒形の顆粒状の２次粒子
であり、ＮａｚＣＯｓ含有量は９９．９重量％、平均粒
子径は４００μｍ１見掛比重は１．Ｉｇ／ｃｃであった
。The thus obtained granules are cylindrical granular secondary particles with a NazCOs content of 99.9% by weight, an average particle diameter of 400 μm, and an apparent specific gravity of 1. It was Ig/cc.
実施例２
平均粒径４０μｍに粉砕された炭酸ソーダ１水塩と４８
重量％の水酸化ナトリウム水溶液とを、重量比で１０：
１の割合゛で回転さら型造粒機に連続的に供給し、平均
粒径６００μｍの造粒物を得た。Example 2 Sodium carbonate monohydrate pulverized to an average particle size of 40 μm and 48
wt% sodium hydroxide aqueous solution at a weight ratio of 10:
The mixture was continuously fed to a rotary platen type granulator at a ratio of 1:1 to obtain granules with an average particle size of 600 μm.
次いで、実施例１と同様に炭酸化および乾燥を行い、粒
状物を得た。Next, carbonation and drying were performed in the same manner as in Example 1 to obtain granules.
かくして得られた粒状物は、球形の顆粒状の２次粒子で
あり、Ｎａ２ＣＯｓ含有量は９９．９重量％、平均粒子
径は６００μｍ、見掛比重は１．０５ｇ／ｃｃであった
。The thus obtained granules were spherical granular secondary particles with a Na2COs content of 99.9% by weight, an average particle diameter of 600 μm, and an apparent specific gravity of 1.05 g/cc.
実施例３
実施例１で得られた、粒状の炭酸ソーダを粉砕して２０
０メツシユのふるいを通過させたもの１０ｋｇに、４８
重量％の水酸化ナトリウム水溶液１．２ｋｇを加え、水
平軸回転型混合機で混合し、さらに双軸型造粒機を用い
平均粒子径４５０μｍの粒子に造粒した。Example 3 The granular soda carbonate obtained in Example 1 was crushed to 20
48 to 10 kg of material passed through a 0 mesh sieve.
1.2 kg of aqueous sodium hydroxide solution (wt%) was added and mixed using a horizontal shaft rotating mixer, and then granulated using a twin shaft granulator to obtain particles having an average particle diameter of 450 μm.
次いで、実施例１と同様に炭酸化および乾燥を行い、粒
状物を得た。Next, carbonation and drying were performed in the same manner as in Example 1 to obtain granules.
かくして得られた粒状物は、円筒形の顆粒状の２次粒子
であり、ＮａｘＣＯｓ含有量は９９．９重量％、平均粒
子径は４５０μｍ、見掛比重は１．Ｉｇ／ｃｃであった
。The thus obtained granules are cylindrical granular secondary particles with a NaxCOs content of 99.9% by weight, an average particle diameter of 450 μm, and an apparent specific gravity of 1. It was Ig/cc.
実施例４
実施例３で得られた、粒状の炭酸ソーダ２ｋｇを、有効
容積３ｆ２の双軸ロッド型混合機に投入し、該炭酸ソー
ダの温度を８０℃に保持し、混合機を作動させつつ、炭
酸ガス濃度５休積％の気体（残りは空気）をＩ Ｎｍ’
／ｈｒの速度で連続的に供給し、同時に６５重量％の水
酸化ナトリウム水溶液を１ ｋｇ／ｈｒの速度で連続的
に供給して、連続的に炭酸化を行った。そして混合機か
ら、０、８６ｋｇ／ｈｒの速度で粉末状の炭酸ソーダを
取り出した。この粉末状の炭酸ソーダはＮａｘＣＯｓ含
有量が９９．９％であった。Example 4 2 kg of granular soda carbonate obtained in Example 3 was charged into a twin-shaft rod mixer with an effective volume of 3 f2, the temperature of the soda carbonate was maintained at 80°C, and the mixer was operated. , a gas with a carbon dioxide concentration of 5% (the rest is air) is I Nm'
Carbonation was carried out continuously by continuously supplying a 65% by weight aqueous sodium hydroxide solution at a rate of 1 kg/hr. Then, powdered soda carbonate was taken out from the mixer at a rate of 0.86 kg/hr. This powdered soda carbonate had a NaxCOs content of 99.9%.
次に、この炭酸ソーダ粉末１０ｋｇに、４８重量％の水
酸化ナトリウム水溶液１．０ｋｇを加え、水平軸回転型
混合機で混合し、さらに双軸型造粒機を用い平均粒子径
４５０μｍの粒子に造粒した。Next, 1.0 kg of a 48% by weight aqueous sodium hydroxide solution was added to 10 kg of this soda carbonate powder, mixed with a horizontal shaft rotating mixer, and further made into particles with an average particle size of 450 μm using a twin shaft granulator. Granulated.
次いで、実施例１と同様に炭酸化および乾燥を行い、粒
状物を得た。Next, carbonation and drying were performed in the same manner as in Example 1 to obtain granules.
かくして得られた粒子は、円筒形の顆粒状の２次粒子で
あり、ＮａｚＣＯａ含有量は９９．９％、平均粒子径は
４３０μｍ、見掛比重は１． Ｉｇ／ｃｃであった。The particles thus obtained are cylindrical granular secondary particles with a NazCOa content of 99.9%, an average particle diameter of 430 μm, and an apparent specific gravity of 1. It was Ig/cc.
実施例５
平均粒径１００μｍの重炭酸ソーダ３ｋｇを、双軸ロッ
ド型混合機に投入し、次いで６５重晴％の水酸化ナトリ
ウム水溶液を２．５ｋｇを投入し、空気をＩ Ｎｍ’／
ｈｒの速度で吹き込みつつ、１時間混合した。得られた
混合物はＮａ２Ｃ０，７６、９重量％、ＮａＯ！Ｉ ４
．０重量％を含有していた。Example 5 3 kg of bicarbonate of soda having an average particle size of 100 μm was charged into a twin-screw rod mixer, then 2.5 kg of a 65% sodium hydroxide aqueous solution was charged, and air was blown in at a rate of I Nm'/
Mixing was continued for 1 hour while blowing at a rate of 1 hour. The resulting mixture contained Na2C0.76, 9% by weight, NaO! I 4
．． It contained 0% by weight.
次に、該混合物を双軸型造粒機を用い平均粒子径４３０
μｍの粒子に造粒した。Next, the mixture was mixed with an average particle size of 430 using a twin-screw granulator.
It was granulated into μm particles.
次いで、この粒子を熱風循環型乾燥機に入れ、炭酸ガス
５体積％雰囲気中（残りは空気）で、温度８０℃に３時
間保持して残留していたＮａＯＨの炭酸化および乾燥を
行い、粒状物を得た。Next, the particles were placed in a hot air circulation dryer and held at a temperature of 80°C for 3 hours in an atmosphere of 5% carbon dioxide by volume (the rest being air) to carbonate the remaining NaOH and dry it. I got something.
かくして得られた粒状物は、円筒形の顆粒状の２次粒子
であり、Ｎａ２ＣＯｓ含有量は９９．９重量％、平均粒
子径は４３０μｍ、見掛比重は１゜１５ｇ／ｃｃであっ
た。The thus obtained granules were cylindrical granular secondary particles with a Na2COs content of 99.9% by weight, an average particle diameter of 430 μm, and an apparent specific gravity of 1°15 g/cc.
［発明の効果］
本発明によれば、か性アルカリ水溶液と炭酸塩粉末を混
合造粒した後、か性アルカリを炭酸化するので、粒径の
そろった粒状炭酸塩を得ることができ、かつこの粒状炭
酸塩は多孔性であり、水などの溶剤に溶解しやすい。[Effects of the Invention] According to the present invention, since the caustic alkali is carbonated after mixing and granulating the caustic alkali aqueous solution and the carbonate powder, it is possible to obtain a granular carbonate having a uniform particle size, and This granular carbonate is porous and easily dissolved in solvents such as water.
Claims (6)
後、か性アルカリの炭酸化を行う粒状炭酸塩の製造方法
。(1) A method for producing granular carbonate, in which a caustic alkali aqueous solution and carbonate powder are mixed and granulated, and then the caustic alkali is carbonated.
め炭酸化する請求項１記載の粒状炭酸塩の製造方法。(2) The method for producing a granular carbonate according to claim 1, wherein the granulated material is carbonated by reacting with carbon dioxide gas in a carbon dioxide atmosphere.
の一部を炭酸化する請求項１記載の粒状炭酸塩の製造方
法。(3) The method for producing a granular carbonate according to claim 1, wherein a part of the caustic alkali is carbonated with carbon dioxide in the carbonate powder.
液と混合造粒して循環使用する請求項１または２記載の
粒状炭酸塩の製造方法。(4) The method for producing a granular carbonate according to claim 1 or 2, wherein a part of the produced granular carbonate is mixed and granulated with a caustic alkali aqueous solution and recycled.
量％である請求項１〜４のいずれか１記載の粒状炭酸塩
の製造方法。(5) The method for producing a granular carbonate according to any one of claims 1 to 4, wherein the amount of free water contained in the granules is 0.1 to 10% by weight.
る請求項１〜５のいずれか１記載の粒状炭酸塩の製造方
法。(6) The method for producing a granular carbonate according to any one of claims 1 to 5, wherein the concentration of the caustic alkali aqueous solution is 3 to 70% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4983188A JPH01226716A (en) | 1988-03-04 | 1988-03-04 | Production of granular carbonate from caustic alkali |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4983188A JPH01226716A (en) | 1988-03-04 | 1988-03-04 | Production of granular carbonate from caustic alkali |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01226716A true JPH01226716A (en) | 1989-09-11 |
Family
ID=12842028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4983188A Pending JPH01226716A (en) | 1988-03-04 | 1988-03-04 | Production of granular carbonate from caustic alkali |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01226716A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5549007A (en) * | 1978-10-04 | 1980-04-08 | Nec Corp | High-frequency transistor power amplifier |
| JPS59223222A (en) * | 1983-06-01 | 1984-12-15 | Tokuyama Soda Co Ltd | Manufacture of light granular alkali carbonate |
-
1988
- 1988-03-04 JP JP4983188A patent/JPH01226716A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5549007A (en) * | 1978-10-04 | 1980-04-08 | Nec Corp | High-frequency transistor power amplifier |
| JPS59223222A (en) * | 1983-06-01 | 1984-12-15 | Tokuyama Soda Co Ltd | Manufacture of light granular alkali carbonate |
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