JPS63297251A - Production of granular slaked lime - Google Patents
Production of granular slaked limeInfo
- Publication number
- JPS63297251A JPS63297251A JP13456487A JP13456487A JPS63297251A JP S63297251 A JPS63297251 A JP S63297251A JP 13456487 A JP13456487 A JP 13456487A JP 13456487 A JP13456487 A JP 13456487A JP S63297251 A JPS63297251 A JP S63297251A
- Authority
- JP
- Japan
- Prior art keywords
- slaked lime
- water
- quicklime
- granules
- slaked
- 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
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 title claims abstract description 48
- 239000000920 calcium hydroxide Substances 0.000 title claims abstract description 48
- 235000011116 calcium hydroxide Nutrition 0.000 title claims abstract description 48
- 229910001861 calcium hydroxide Inorganic materials 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000292 calcium oxide Substances 0.000 claims abstract description 25
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000001694 spray drying Methods 0.000 claims abstract description 14
- 238000006703 hydration reaction Methods 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 12
- 230000018044 dehydration Effects 0.000 claims abstract description 9
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000020169 heat generation Effects 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 description 26
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000003516 soil conditioner Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 3
- 230000003472 neutralizing effect Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000011575 calcium Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- -1 extrusion method Chemical compound 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic 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）
本発明は廃酸の中和、土壌改良剤として好適な粒径、水
分含有量および水崩壊性に優れた顆粒状消石灰の製造方
法に関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for producing granular slaked lime that has excellent particle size, water content, and water disintegration properties and is suitable for neutralizing waste acids and as a soil conditioner. It is.
消石灰は工業材料として２基礎的な化学薬品であり、廃
酸の中和など工業薬品として、また土壌改良剤として農
地に散布するなどして、広く使用されている。Slaked lime is a basic chemical as an industrial material, and is widely used as an industrial chemical, such as for neutralizing waste acids, and as a soil conditioner, sprayed on farmland.
しかし、従来、消石灰は粉末状態で使用されており、使
用に際して飛散するため２作業環境を害するという問題
があった。したがって、この消石灰を顆粒状にすること
によって作業環境を改善する試みが種々なされてきた。However, slaked lime has conventionally been used in a powdered state, and it scatters during use, resulting in two problems: it harms the working environment. Therefore, various attempts have been made to improve the working environment by granulating this slaked lime.
従来、消石灰を顆粒化する方法として、転勤方式押出し
方式、圧縮方式、流動方式、噴霧乾燥方式攪拌方式等積
々の方法が試みられたが、いずれも品質、製造コスト等
の問題があり、製品化が進んでいないのが現状である。In the past, a number of methods have been tried to granulate slaked lime, such as extrusion method, compression method, fluidization method, spray drying method, and stirring method, but all of them have problems such as quality and manufacturing cost, and the product The current situation is that progress has not been made.
例えば、転勤方式、押出し方式、攪拌方式、流動方式、
噴霧乾燥方式では、水の添加が必要であり造粒後、乾燥
工程を設ける必要があり製造コストが上昇すると言う問
題がある。For example, transfer method, extrusion method, stirring method, flow method,
The spray drying method requires the addition of water and a drying step after granulation, which raises the problem of increased manufacturing costs.
特に、流動方式、噴霧乾燥方式では、比較的粒径の揃っ
た顆粒を得ることができるが、別途乾燥工程を設けない
限り、顆粒中の水分含有量が１０％を越える。このよう
に、高い水分含有量を有する顆粒状の消石灰は、空気中
の炭酸ガスを吸収し。Particularly, with the fluidization method and the spray drying method, it is possible to obtain granules with a relatively uniform particle size, but unless a separate drying step is provided, the water content in the granules exceeds 10%. In this way, granular slaked lime with a high water content absorbs carbon dioxide gas from the air.
顆粒の表面が炭酸カルシュムに変化し、実用に供し得な
い。The surface of the granules changes to calcium carbonate, making them unusable.
さらに、噴霧乾燥方式は、バインダーを必要とせず、か
つ粒径も揃い、水崩壊性に富んだ顆粒が得られる方法で
あるが、唯一の欠点は乾燥コストがかかり製造費用が嵩
むことである。Furthermore, the spray drying method does not require a binder, has a uniform particle size, and can obtain granules with high water disintegrability, but the only drawback is that the drying cost is high and the manufacturing cost increases.
（発明が解決しようとする問題点）
本発明は、従来の顆粒消石灰の製造方法における前記の
ごとき問題点に鑑みてなされたもので５粒径が比較的揃
い、かつ顆粒中の水分含有量が少なく、水崩壊性に優れ
、さらに乾燥コストが低減できる１品質が優れ、かつ製
造コストの安価な顆粒状の消石灰の製造方法を提供する
ことを目的とするものである。(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned problems in the conventional method for producing granulated slaked lime. It is an object of the present invention to provide a method for producing granular slaked lime, which has excellent quality such as reduced drying time, excellent water disintegrability, and reduced drying cost, and is inexpensive to produce.
（問題点を解決するための手段）
本発明は廃酸の中和、土壌改良剤等として最適な顆粒状
の消石灰を得るため８粒径、水分含有量。(Means for Solving the Problems) The present invention has a particle size of 8 and a water content in order to obtain granular slaked lime that is most suitable for neutralizing waste acids, as a soil conditioner, etc.
水崩壊性について調査した結果、顆粒の粒径は。As a result of investigating water disintegration, the particle size of the granules is as follows.
０．１〜１．０ｍｍにすることが好ましいこと、また水
分含有量は５％以下にすることが好ましいことを見出し
１本発明は前記条件を満足する顆粒状の消石灰を得るた
め１本発明者が従来の噴霧乾燥方式の利点を損なうこと
なく、かつその欠点である乾燥コストを低減するため１
本発明者が種々の検討を重ねた結果、生石灰の水和反応
による脱水と発熱を利用することにより、乾燥エネルギ
ーを低減でき５本発明を完成することに成功したもので
ある。The present inventor discovered that it is preferable to have a thickness of 0.1 to 1.0 mm, and that it is preferable that the water content be 5% or less. In order to reduce the drying cost, which is the disadvantage of the conventional spray drying method, without sacrificing the advantages of the conventional spray drying method.
As a result of various studies, the present inventor has succeeded in completing the present invention, which can reduce drying energy by utilizing dehydration and heat generation caused by the hydration reaction of quicklime.
すなわち２本発明は顆粒状の消石灰を製造するに生石灰
粉末を流動させておいた噴霧乾燥室内に。In other words, in the present invention, granular slaked lime is produced in a spray drying chamber in which quicklime powder is fluidized.
消石灰に水を加えて作成したスラリーを噴霧させること
により、噴霧させ水を含んだ消石灰粉と生石灰とを衝突
させ、水和反応により、脱水と同時に発熱させ、消石灰
粉の水分を除去、乾燥させることにより製造するもので
ある。By spraying a slurry made by adding water to slaked lime, the slaked lime powder that has been sprayed and contains water collides with the quicklime, and a hydration reaction generates heat at the same time as dehydration, removing water from the slaked lime powder and drying it. It is manufactured by
また、必要に応じて生石灰の水和反応による。脱水、乾
燥の補助手段として、乾燥空気を噴霧乾燥室中に吹込む
工程を付加することができるものである。Also, if necessary, by the hydration reaction of quicklime. As an auxiliary means for dehydration and drying, a step of blowing dry air into the spray drying chamber can be added.
また２本発明法において、消石灰に水を加えて作成した
スラリーの濃度については、ノズルより噴霧するに必要
な流動性を付与するため、消石灰スラリーの濃度は４３
％以下にすることが望ましい。In addition, in the method of the present invention, the concentration of the slurry created by adding water to slaked lime is 43.
% or less.
さらに９本発明法により製造された顆粒の粒径は０．１
〜１．０ｍｍ以内であり、かつ水分含有量は５％以下で
あり、所望の消石灰の顆粒を得ることができた。Furthermore, the particle size of the granules produced by the method of the present invention is 0.1
-1.0 mm or less, and the moisture content was 5% or less, making it possible to obtain desired slaked lime granules.
なお顆粒の粒径を０．１〜１．０ ｍｍ程度にしたのは
。The particle size of the granules was set to about 0.1 to 1.0 mm.
０．１ｍｍ以上にすることにより、土壌改良剤として散
布した場合、飛散して作業環境を害することがなく、ま
た粒径は１．０ ｍｍ以下とすることにより水崩壊性に
富んだ顆粒を得ることができるためである。さらに、顆
粒状の消石灰中の水分含有量を５％以下にすることによ
り、保管中に空気中の炭酸ガスを吸収し、顆粒の表面が
炭酸カルシウムに変化するのを防止することができるた
めである。By setting the particle size to 0.1 mm or more, when sprayed as a soil conditioner, it will not scatter and harm the working environment, and by setting the particle size to 1.0 mm or less, granules with high water disintegration properties can be obtained. This is because it can be done. Furthermore, by keeping the water content in granular slaked lime at 5% or less, it is possible to absorb carbon dioxide gas in the air during storage and prevent the surface of the granules from turning into calcium carbonate. be.
（作用）
本発明は、生石灰粉末を流動させておいた噴霧乾燥室中
に、消石灰に水を加えて生成したスラリを噴霧させ、水
和反応させ、脱水と同時に発熱ささせ、消石灰粉の水分
を除去、乾燥させるものである。(Function) The present invention sprays a slurry produced by adding water to slaked lime into a spray drying chamber in which quicklime powder is fluidized, causes a hydration reaction, and generates heat at the same time as dehydration. is removed and dried.
この水和反応は発熱反応であるので、この熱エネルギー
によって残部の水は、蒸発、乾燥され９球形で粒径が０
．１〜１．０ ｍｍ程度に揃った顆粒が得られ、かつ顆
粒中の水分含有量は５％以下であり。Since this hydration reaction is an exothermic reaction, the remaining water is evaporated and dried by this thermal energy, resulting in 9 spherical particles with a particle size of 0.
．． Granules with a uniform diameter of about 1 to 1.0 mm are obtained, and the water content in the granules is 5% or less.
極めて商品価値の高い顆粒状消石灰を得ることができる
。Granular slaked lime with extremely high commercial value can be obtained.
なお、水和反応は次式で現わされる。Note that the hydration reaction is expressed by the following formula.
Ｃａ （ＯＨ）＞＋ＨａＯ＋Ｃａ Ｑ＝ ２ Ｃａ
（０■Ｉ）。Ca (OH)>+HaO+Ca Q= 2 Ca
(0■I).
１５．５９Ｋｃａｌ ／ ｍ ｏ １
すなわち、生石灰（Ｃａｂ）ＩＫｇは水和反応によって
、 ２７８ Ｋｃａｌの発熱をする。そして、水和反応
にあずかった生石灰は消石灰に変化し、消石灰スラリー
の粒滴の周囲に付着、固結し２粒径を肥大させる効果を
有する。15.59 Kcal/m o 1 That is, IKg of quicklime (Cab) generates 278 Kcal of heat due to the hydration reaction. Then, the quicklime that has undergone the hydration reaction changes into slaked lime, which adheres and solidifies around the droplets of the slaked lime slurry, thereby having the effect of enlarging the particle size.
また、スラリー中の水量と所要生石灰量との関係につい
ては、スラリー中の水の脱水、蒸発に必要な生石灰は、
設備により若干具なるが、水分６０Ｋｇを脱水、蒸発さ
せるに必要な生石灰は、１１０〜１４０Ｋｇであり、こ
の場合、顆粒中の水量は５％以下となる。Regarding the relationship between the amount of water in the slurry and the amount of quicklime required, the amount of quicklime required for dehydration and evaporation of the water in the slurry is
The amount of quicklime required to dehydrate and evaporate 60 kg of water is 110 to 140 kg, although this varies depending on the equipment, and in this case, the amount of water in the granules is 5% or less.
このように９本発明は製造コストを低減せしめるもので
ある。つまり消石灰製造設備を経ずして顆粒状の消石灰
を得ることができるものである。In this way, the present invention reduces manufacturing costs. In other words, granular slaked lime can be obtained without going through slaked lime manufacturing equipment.
なお、上記生石灰粉による脱水、乾燥工程において、熱
エネルギーのバランスの関係から若干の加熱空気を吹込
み熱源の補助とすることも可能である。In addition, in the above-mentioned dehydration and drying process using quicklime powder, it is also possible to blow in some heated air to assist the heat source due to the balance of thermal energy.
（実施例）
顆粒状の消石灰を製造するに、試験設備として流動層造
粒機を改造し、スプレーノズルをスラリー用と取替え、
かつノズル径を１．２１とし、噴霧乾燥室内に底面より
スクリーンを通して常温の空気で７４メソシユ、アンダ
ーの生石灰を吹込み生石灰粉末の流動層を形成した。(Example) To produce granulated slaked lime, a fluidized bed granulator was modified as a test equipment, the spray nozzle was replaced with one for slurry,
In addition, the nozzle diameter was set to 1.21, and 74 mSO of quicklime was blown into the spray drying chamber through a screen from the bottom with room temperature air to form a fluidized bed of quicklime powder.
ついでその流動層中に、予め消石灰に水を添加し作成し
ておいた消石灰４０％、比重１．３のスラリーを上部の
スプレーノズルから噴霧せしめた。Next, a slurry of 40% slaked lime and a specific gravity of 1.3, which had been prepared by adding water to slaked lime in advance, was sprayed into the fluidized bed from an upper spray nozzle.
噴霧されたスラリー〇粒滴は、生石灰粉の衝撃を受け、
生石灰の水和反応によって脱水されると共に１発熱し、
この熱エネルギーによって残部の水は、蒸発、乾燥され
９球形で粒径の揃った顆粒状の消石灰が製造できた。The sprayed slurry droplets are impacted by quicklime powder,
The hydration reaction of quicklime dehydrates it and generates 1 heat.
The remaining water was evaporated and dried by this thermal energy, producing 9 spherical granular slaked lime of uniform particle size.
なお、製造した顆粒状の消石灰の粒径は、約０゜２ｍｍ
の球形であり、顆粒中の水分含有量は４％とやや高かっ
たが、顆粒の強度は充分にハンドリングに耐えるもので
あった。The particle size of the produced granular slaked lime is approximately 0.2 mm.
Although the water content in the granules was somewhat high at 4%, the strength of the granules was sufficient to withstand handling.
また５ ０Ｋｇのスラリー、つまり２０Ｋｇの消石灰を
造粒するに生石灰５０Ｋｇを使用し、７２Ｋｇの消石灰
の顆粒を得た。Further, 50 kg of quicklime was used to granulate 50 kg of slurry, that is, 20 kg of slaked lime, and 72 kg of slaked lime granules were obtained.
実施例２
実施例１と同じ試験機を用い、ノズル径を１．０ｎｕａ
とした。そして、約２００℃の加熱空気を用いて７４メ
ソシユ・アンダーの生石灰を流動させておき、４０％の
消石灰のスラリーを噴霧せしめた、その結果、得られた
消石灰の粒径は１４９ミクロンオーバー９３％、１４９
ミクロンアンターフ％の顆粒を得ることができた。また
顆粒中の水分含有量は３％で２強度も充分であった。そ
して８Ｋｇの消石灰を造粒するに１７Ｋｇの生石灰を使
用し、２８Ｋｇの消石灰の顆粒を得ることができた。Example 2 Using the same test machine as Example 1, the nozzle diameter was set to 1.0 nua.
And so. Then, using heated air at about 200 degrees Celsius, 74 mesounder of quicklime was fluidized, and a slurry of 40% slaked lime was sprayed.As a result, the particle size of the obtained slaked lime was 149 microns over 93%. , 149
Granules with micron unturf% could be obtained. Furthermore, the water content in the granules was 3% and the strength of 2 was sufficient. 17 kg of quicklime was used to granulate 8 kg of slaked lime, and 28 kg of slaked lime granules were obtained.
実施例３
対比実験として、生石灰粒を流動させずに噴霧せしめた
場合には、加熱空気の温度を６００℃にする必要があり
・、その時の排出空気の温度は１３０°Ｃであった。な
お得られた消石灰の顆粒の粒径は約０．１５ｍｍであり
、顆粒中の水分含有量は８％と高かった。Example 3 As a comparative experiment, when quicklime particles were sprayed without fluidization, the temperature of the heated air needed to be 600°C, and the temperature of the discharged air at that time was 130°C. The particle size of the obtained slaked lime granules was about 0.15 mm, and the water content in the granules was as high as 8%.
（発明の効果）
本発明は、従来の顆粒消石灰の製造方法における問題点
を解消したもので、得られた顆粒は粒径が比較的揃い、
かつ顆粒中の水分含有量が少なく。(Effects of the Invention) The present invention solves the problems in the conventional method for producing granulated slaked lime, and the resulting granules have relatively uniform particle sizes.
And the water content in the granules is low.
水崩壊性に優れ、さらに乾燥コストが低減できるもので
あり産業上寄与するところが極めて大である。It has excellent water disintegrability and can reduce drying costs, making it extremely useful for industry.
Claims (2)
消石灰に水を加えて作成したスラリーを噴霧させること
により、噴霧され水を含んだ消石灰粒と生石灰とを衝突
させ、水和反応により、脱水と同時に発熱させ、消石灰
粒中の水分を除去、乾燥させることを特徴とする顆粒状
消石灰の製造方法。(1) Inside the spray drying chamber where quicklime powder was kept fluidized,
By spraying a slurry created by adding water to slaked lime, the sprayed slaked lime grains containing water collide with the quicklime, causing a hydration reaction that generates heat at the same time as dehydration, removing the moisture in the slaked lime grains and drying them. A method for producing granular slaked lime, the method comprising:
として、乾燥空気を噴霧乾燥室に吹込む工程を付加する
特許請求の範囲第１項に記載の顆粒状消石灰の製造方法
。(2) The method for producing granular slaked lime according to claim 1, which further includes a step of blowing dry air into a spray drying chamber as an auxiliary means for dehydration and drying through the hydration reaction of quicklime.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13456487A JPS63297251A (en) | 1987-05-28 | 1987-05-28 | Production of granular slaked lime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13456487A JPS63297251A (en) | 1987-05-28 | 1987-05-28 | Production of granular slaked lime |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63297251A true JPS63297251A (en) | 1988-12-05 |
Family
ID=15131282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13456487A Pending JPS63297251A (en) | 1987-05-28 | 1987-05-28 | Production of granular slaked lime |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63297251A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100320244B1 (en) * | 1999-09-13 | 2002-01-10 | 김영조 | A munufacturing process for high activity calcium hydrooxide having large scale specific surface area |
| CN112159124A (en) * | 2020-10-26 | 2021-01-01 | 张家港宏昌钢板有限公司 | Method for strengthening quicklime digestion process in sintering production process |
-
1987
- 1987-05-28 JP JP13456487A patent/JPS63297251A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100320244B1 (en) * | 1999-09-13 | 2002-01-10 | 김영조 | A munufacturing process for high activity calcium hydrooxide having large scale specific surface area |
| CN112159124A (en) * | 2020-10-26 | 2021-01-01 | 张家港宏昌钢板有限公司 | Method for strengthening quicklime digestion process in sintering production process |
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