JPH0133216B2 - - Google Patents
Info
- Publication number
- JPH0133216B2 JPH0133216B2 JP55184684A JP18468480A JPH0133216B2 JP H0133216 B2 JPH0133216 B2 JP H0133216B2 JP 55184684 A JP55184684 A JP 55184684A JP 18468480 A JP18468480 A JP 18468480A JP H0133216 B2 JPH0133216 B2 JP H0133216B2
- Authority
- JP
- Japan
- Prior art keywords
- calcium carbonate
- metal salt
- exhaust gas
- kiln
- firing furnace
- 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.)
- Expired
Links
- 238000001035 drying Methods 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 150000003839 salts Chemical class 0.000 claims description 18
- 238000010304 firing Methods 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 11
- 238000000227 grinding Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 76
- 229910000019 calcium carbonate Inorganic materials 0.000 description 38
- 239000007789 gas Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 15
- 238000001354 calcination Methods 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000009825 accumulation 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
- 239000011362 coarse particle Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Landscapes
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Description
【発明の詳細な説明】
本発明は焼成炉に送る前の予備乾燥方法、更に
詳しくは、金属塩焼成炉における金属塩スラリー
の予備乾燥方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for pre-drying a metal salt slurry before sending it to a firing furnace, and more particularly to a method for pre-drying a metal salt slurry in a metal salt firing furnace.
本発明の於ける金属塩とは炭酸カルシウム、炭
酸マグネシウム、水酸化マグネシウム、ケイ酸マ
グネシウム等が挙げられ、要するに焼成炉で金属
塩を分解させて、ある種の生成物を得る場合に適
用できる。 Metal salts in the present invention include calcium carbonate, magnesium carbonate, magnesium hydroxide, magnesium silicate, etc., and can be applied to the case where a certain type of product is obtained by decomposing metal salts in a kiln.
しかし、以下の説明では特に好ましい炭酸カル
シウム焼成炉における炭酸カルシウムの予備乾燥
方法について具体的に述べる。 However, in the following description, a particularly preferred method for pre-drying calcium carbonate in a calcium carbonate calcining furnace will be specifically described.
パルプ工場では、チツプ蒸解で苛性ソーダを用
いるため、炭酸カルシウムを焼成炉で焼成する工
程がある。 At pulp mills, because caustic soda is used in chip cooking, there is a process in which calcium carbonate is burned in a kiln.
この焼成炉で効率よく焼成するためにできるだ
け炭酸カルシウムの水分量を減すことで、色々の
予備乾燥方法が発表、実施されている。 Various pre-drying methods have been announced and implemented to reduce the moisture content of calcium carbonate as much as possible in order to efficiently bake it in this kiln.
従来の焼成炉における予備乾燥方法としては、
炭酸カルシウムのスラリーをバキユームフイルタ
ー１に通し、ダブルパドルミキサー２、熱排ガス
を導入したゲージミル３、サイクロン４、ダブル
パドルミキサー２の工程で炭酸カルシウムの水分
量を約10％にして焼成炉５に送る炭酸カルシウム
の予備乾燥方法がある。 The pre-drying method in the conventional kiln is as follows:
The slurry of calcium carbonate is passed through a vacuum filter 1, and then the moisture content of calcium carbonate is reduced to approximately 10% through the steps of a double paddle mixer 2, a gauge mill 3 that introduces hot exhaust gas, a cyclone 4, and a double paddle mixer 2. There is a pre-drying method for sending calcium carbonate.
この方法は操業の安定性の点で優れた予備乾燥
法ではあるが、水分量が多く焼成炉５に負担がか
かり、焼成炉での生産性が悪く、エネルギーの消
費量が多い欠点を有する。 Although this method is a pre-drying method that is excellent in terms of operational stability, it has the drawbacks that the amount of water is large, which places a burden on the firing furnace 5, resulting in poor productivity in the firing furnace and high energy consumption.
また別の方法としては、炭酸カルシウムのスラ
リーをバキユームフイルターで瀘過し、スクリユ
ーコンベヤにて一部は焼成炉で、一部はダブルパ
ドルミキサー、熱排ガスを導入したゲージミル、
サイクロン工程を経て、一部は上記のスクリユー
コンベヤの炭酸カルシウムと混合し、約10％の水
分量で焼成炉へ送られ、残部はダブルパドルミキ
サーに戻る予備乾燥方法である。これも焼成炉に
入る前の炭酸カルシウムの水分量が約10％である
ために、前記と同様の欠点を有する。 Another method is to filter the calcium carbonate slurry with a vacuum filter, send it to a screw conveyor, part of it goes to a calcining furnace, part of it goes to a double paddle mixer, a gauge mill that introduces hot exhaust gas, etc.
After passing through the cyclone process, a portion is mixed with the calcium carbonate in the screw conveyor and sent to the kiln with a moisture content of approximately 10%, and the remainder is returned to the double paddle mixer in a pre-drying method. This also has the same drawbacks as above because the moisture content of calcium carbonate before entering the kiln is about 10%.
本発明の目的は、予備乾燥方法における従来の
焼成炉よりも燃料を節減する方法であり。 The object of the invention is a method that saves fuel over conventional kilns in the pre-drying process.
本発明の別の目的は、焼成炉における生産性を
向上させるための予備乾燥方法である。 Another object of the invention is a pre-drying method for improving productivity in a kiln.
また別の目的は焼成炉からの焼成物の粒子を均
一にするための予備乾燥方法である。 Another object is a pre-drying method for making the particles of the fired product uniform from the firing furnace.
本発明者は、前記の目的を達成するための技術
的手段として種々検討を重ねた結果、次の工程で
炭酸カルシウムスラリーを処理して予備乾燥する
方法が良好であることを見つけた。 As a result of various studies as a technical means for achieving the above object, the present inventor found that a method of treating and pre-drying the calcium carbonate slurry in the next step is a good method.
即ち、金属塩スラリーを脱水する装置、粉砕す
る装置、焼成炉からの熱排ガスと接触させながら
風送する装置、排ガスと分離する装置を経て、最
終水分率を５％（重量）以下好ましくは３％重量
以下とした金属塩粉末を、必要の応じては、これ
に上記粉砕する装置から取り出されるウエツト金
属塩を混合して焼成炉に送ることを特徴とする焼
成炉の予備乾燥方法である。 That is, the metal salt slurry is passed through a device for dehydrating it, a device for pulverizing it, a device for blowing it in contact with hot exhaust gas from the firing furnace, and a device for separating it from the exhaust gas, until the final moisture content is reduced to 5% (by weight) or less, preferably 3%. This is a pre-drying method for a firing furnace, characterized in that the metal salt powder is mixed with a wet metal salt taken out from the above-mentioned pulverizing device and sent to the firing furnace, if necessary.
更に上記方法に、分離した排ガスの一部を、風
送する装置の前、好ましくは金属塩供給フードに
再循環させる系を追加した。 Furthermore, a system was added to the above process for recycling a portion of the separated exhaust gas before the blowing device, preferably into the metal salt supply hood.
炭酸カルシウムスラリーは、通常固形分濃度20
〜50％の流動性のある炭酸カルシウムである。該
スラリーは脱水する装置、例えばバキユームフイ
ルターで脱水し水分を20〜40％に下げ、炭酸カル
シウムのケーキにする。 Calcium carbonate slurry usually has a solids concentration of 20
~50% fluid calcium carbonate. The slurry is dehydrated using a dehydrating device, such as a vacuum filter, to reduce the water content to 20-40%, and then turned into a calcium carbonate cake.
このケーキは粉砕混合する装置、例えばダブル
パドルミキサー、その他の粉砕混合機により粉砕
する。この粉砕混合機では、次の工程で焼成炉か
らの熱排ガス200〜600℃による接触乾燥で効率よ
く水分を蒸発させるためにできるだけ粉砕混合す
る必要がある。 The cake is ground in a grinding and mixing device, such as a double paddle mixer or other grinding mixer. In this pulverizing mixer, it is necessary to pulverize and mix as much as possible in order to efficiently evaporate moisture through contact drying using hot exhaust gas from the kiln at 200 to 600°C in the next step.
従つて、この粉砕混合機はその目的を達成する
ものであれば、いかなる装置でもよい。 Therefore, this grinding mixer may be any device as long as it achieves its purpose.
次に焼成炉からの熱排ガスと接触させて風送す
る装置では、前工程の粉砕混合機で粉砕された炭
酸カルシウムを更に粉砕し、焼成炉からの熱排ガ
スと接触させて風送することにより効率よく水分
を蒸発させるものであつて、好ましい設備として
はケージミルが挙げられ回転翼列を有する粉砕風
送機である。 Next, in the device that blows the calcium carbonate in contact with the hot exhaust gas from the firing furnace, the calcium carbonate that has been crushed in the crushing mixer in the previous step is further crushed, and the calcium carbonate is brought into contact with the hot exhaust gas from the firing furnace and then blown. Preferred equipment for efficiently evaporating moisture is a cage mill, which is a crushing air blower having a row of rotary blades.
最後に炭酸カルシウム中の排ガスを分離する装
置、好ましくはサイクロンと呼ばれる設備を経て
最終水分率が５％（重量）以下好ましくは３％
（重量）以下の炭酸カルシウム粉末にしたものを
焼成炉に送る。 Finally, the waste gas in the calcium carbonate is passed through a device, preferably a device called a cyclone, to reduce the final moisture content to 5% (by weight) or less, preferably 3%.
(Weight) Calcium carbonate powder below is sent to the kiln.
尚、サイクロンを出てきた炭酸カルシウム粉末
は絶乾に近い状態にあり、必要に応じては、粉砕
混合機から出てくる水分率20〜40％のウエツト炭
酸カルシウムと混合して若干水分量を増やす方法
で焼成炉に送ることも出来る。 The calcium carbonate powder that comes out of the cyclone is in a nearly dry state, and if necessary, it can be mixed with wet calcium carbonate with a moisture content of 20 to 40% coming out of the grinding mixer to reduce the moisture content. You can also send it to the kiln by increasing the amount.
また焼成炉の金属塩供給フードに堆積する炭酸
カルシウムは、従来湿式回収法で回収していた
が、金属塩供給フード内に傾斜板を設けることに
よつて、堆積による閉塞を防止することが出来
る。 In addition, calcium carbonate deposited in the metal salt supply hood of the kiln was conventionally recovered using a wet recovery method, but by installing an inclined plate in the metal salt supply hood, blockage due to accumulation can be prevented. .
又、サイクロン出口ガスの一部をケージミルの
前、好ましくは金属塩供給フードに再循環するこ
とによつて、堆積の防止及びケージミルの操業を
一段と安定化することが可能となる。 Also, by recycling a portion of the cyclone outlet gas before the cage mill, preferably into the metal salt supply hood, it is possible to prevent build-up and to further stabilize cage mill operation.
本発明の予備乾燥方法は、必須の装置を用いた
工程のみを記載したが、各装置間で炭酸カルシウ
ムを搬送するためにスクリユーコンベヤ、チユン
コンベヤ、ベルトコンベヤ、シユート等を用いる
ことも出来る。 In the pre-drying method of the present invention, only steps using essential equipment have been described, but a screw conveyor, a chain conveyor, a belt conveyor, a chute, etc. can also be used to convey calcium carbonate between each equipment.
焼成炉供給炭酸カルシウムの水分率を５％（重
量）以下好ましくは３％（重量）以下にすること
は、焼成炉内での炭酸カルシウムの塊りをなくす
ことが出来、焼成物は粒子の均一な微粒子状のも
のが得られ、生産性の向上、更に燃料が大巾に節
減可能となる。 Setting the moisture content of the calcium carbonate supplied to the kiln to 5% (by weight) or less, preferably 3% (wt) or less can eliminate lumps of calcium carbonate in the kiln, and the fired product will have uniform particles. As a result, it is possible to obtain fine particles, which improves productivity and significantly reduces fuel consumption.
次に本発明を図面に示す実施例に基づいて説明
する。 Next, the present invention will be explained based on embodiments shown in the drawings.
第１図は従来技術であり、概要は前述したので
省略する。 FIG. 1 shows the prior art, and since the outline has been described above, the description thereof will be omitted.
第２図は、炭酸カルシウムスラリーをバキユー
ムフイルター１で脱水しシートを形成し、そのシ
ートを粉砕混合機２′で粉砕してケージミル３に
送る、ここで焼成炉５の熱排ガスと接触させサイ
クロン４に送つて、最終水分率を５％（重量）以
上好ましくは３％以下の炭酸カルシウム粉末にし
て、スクリユーコンベヤ６によつて供給コンベヤ
７に送り、焼成炉５に供給する、サイクロン出口
の排ガスの一部を金属塩供給フード８に再循環さ
せる予備乾燥方法を示す。 In Figure 2, calcium carbonate slurry is dehydrated using a vacuum filter 1 to form a sheet, and the sheet is crushed using a crushing mixer 2' and sent to a cage mill 3, where it is brought into contact with hot exhaust gas from a calcining furnace 5 and passed through a cyclone. 4, the powder is made into calcium carbonate powder with a final moisture content of 5% (weight) or more, preferably 3% or less, and is sent to the supply conveyor 7 by the screw conveyor 6, and then fed to the firing furnace 5 at the cyclone outlet. A pre-drying method is shown in which a portion of the exhaust gas is recycled to the metal salt supply hood 8.
第３図は他の実施例で、サイクロン４より出て
来る炭酸カルシウム粉末をスクリユーコンベヤ６
に送る系より、一部を粉砕混合機２′に送り、ウ
エツト炭酸カルシウムと混合しケージミル３に送
る予備乾燥方法を示す。 Figure 3 shows another embodiment in which calcium carbonate powder coming out of the cyclone 4 is conveyed to a screw conveyor 6.
A pre-drying method is shown in which a part of the powder is sent to the grinding mixer 2', mixed with wet calcium carbonate, and sent to the cage mill 3.
第４図は、第３図実施例に必要に応じてケージ
ミル３に送る系より、一部を供給コンベヤ７で炭
酸カルシウム粉末と混合して焼成炉５に供給する
予備乾燥方法を示す。 FIG. 4 shows a pre-drying method in which a part of the powder is mixed with calcium carbonate powder on the supply conveyor 7 and supplied to the firing furnace 5 from the system of the embodiment shown in FIG. 3, if necessary.
本発明の効果を述べる。 The effects of the present invention will be described.
従来焼成炉に供給されていた炭酸カルシウム水
分率は約10％と多く生産性やエネルギー消費の面
で多くの欠点があつたが、本発明はサイクロン出
口の水分率（５％（重量）以下好ましくは３％以
下）の少ない炭酸カルシウム粉末を直接焼成炉に
供給するので、上記欠点が解消され、焼成炉の生
産性は向上し、エネルギー消費量も大巾に減少出
来るのである。 Conventionally, the moisture content of calcium carbonate supplied to the kiln was as high as about 10%, which caused many drawbacks in terms of productivity and energy consumption. Since calcium carbonate powder with a low content (3% or less) is directly supplied to the kiln, the above-mentioned drawbacks are eliminated, the productivity of the kiln is improved, and energy consumption can be greatly reduced.
別の利点は、焼成して得られる酸化カルシウム
は粒子状の均一な微粉末状のものが得られる。 Another advantage is that the calcined calcium oxide is in the form of a uniformly fine powder.
従来の方法では、焼成炉に入る前の炭酸カルシ
ウム水分率が約10％であつたため、ある程度粗粒
子状で焼成炉に入り、塊り状になり易く、焼成炉
中で粉砕する必要があつたが、本発明の方法で
は、粉末状の炭酸カルシウムで焼成炉に入るた
め、粉砕する負担が軽減でき、焼成炉自体も簡略
設備で可能となる。 In the conventional method, since the moisture content of calcium carbonate before entering the kiln was approximately 10%, the calcium carbonate entered the kiln in the form of coarse particles to some extent, easily forming lumps, and it was necessary to crush the calcium carbonate in the kiln. However, in the method of the present invention, since powdered calcium carbonate is entered into the kiln, the burden of pulverization can be reduced, and the kiln itself can be equipped with simple equipment.
更に別の利点は、供給炭酸カルシウムの水分量
が減少すれば、当然燃料使用量も減少しそれにと
もなつてガス量も減少する、ガス量の減少はケー
ジミルの詰りや他の障害の原因ともなる。 A further advantage is that if the water content of the calcium carbonate feed is reduced, the amount of fuel used will naturally be reduced, and with it, the amount of gas will also be reduced; a reduction in the amount of gas will also cause clogging of the cage mill and other problems. .
本発明は、サイクロン出口の排ガスの一部をケ
ージミル前に再循環させることにより、ガス量の
調節を計ることが出来るので、ケージミルの障害
を防止し操業の安定を計ることが可能となる。 In the present invention, by recirculating a portion of the exhaust gas at the cyclone outlet to the front of the cage mill, the amount of gas can be adjusted, thereby making it possible to prevent cage mill failure and stabilize the operation.
第１図は従来の予備乾燥方法の工程図。第２〜
４図は本発明の予備乾燥方法の実施例を示す工程
図。図中同一符号は同一設備を示す。
１……バキユームフイルター、２……ダブルパ
ドルミキサー、２′……粉砕混合機、３……ケー
ジミル、４……サイクロン、５……焼成炉、６…
…スクリユーコンベヤ、７……供給コンベヤ、８
……金属塩供給フード、９……傾斜板。
FIG. 1 is a process diagram of a conventional pre-drying method. 2nd ~
FIG. 4 is a process diagram showing an example of the pre-drying method of the present invention. The same symbols in the figure indicate the same equipment. 1... Vacuum filter, 2... Double paddle mixer, 2'... Grinding mixer, 3... Cage mill, 4... Cyclone, 5... Calcining furnace, 6...
... Screw conveyor, 7 ... Supply conveyor, 8
……Metal salt supply hood, 9… Inclined plate.
Claims (1)
置、焼成炉からの熱排ガスと接触させながら風送
する装置、排ガスと分離する装置を経て、最終水
分率を５％（重量）以下とした金属塩粉末を、又
は、該金属塩粉末と上記粉砕する装置から取り出
されるウエツト金属塩を混合して焼成炉に送ると
共に、分離された排ガスの一部を傾斜板を設けた
金属塩供給フードに再循環させ排出ガス量の調節
を行うことを特徴とする焼成炉における予備乾燥
方法。1 The metal salt slurry is processed through a device for dehydrating the slurry, a device for crushing it, a device for blowing it while contacting it with hot exhaust gas from the firing furnace, and a device for separating it from the exhaust gas, with a final moisture content of 5% (weight) or less. The powder or the metal salt powder and the wet metal salt taken out from the grinding device are mixed and sent to the firing furnace, and a part of the separated exhaust gas is recycled to the metal salt supply hood provided with an inclined plate. A preliminary drying method in a kiln, characterized by adjusting the amount of exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18468480A JPS57108579A (en) | 1980-12-25 | 1980-12-25 | Preheating for kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18468480A JPS57108579A (en) | 1980-12-25 | 1980-12-25 | Preheating for kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57108579A JPS57108579A (en) | 1982-07-06 |
| JPH0133216B2 true JPH0133216B2 (en) | 1989-07-12 |
Family
ID=16157557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18468480A Granted JPS57108579A (en) | 1980-12-25 | 1980-12-25 | Preheating for kiln |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57108579A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57133295A (en) * | 1981-02-09 | 1982-08-17 | Tsukishima Kikai Co | Burning of lime sludge |
| JPS5989921A (en) * | 1982-11-11 | 1984-05-24 | Nippon Kokan Kk <Nkk> | Sludge feeding method in sludge incinerator system with drying machine |
| FI91005C (en) * | 1989-01-26 | 1994-04-25 | Ahlstroem Oy | Method and apparatus for heat treatment of lime |
-
1980
- 1980-12-25 JP JP18468480A patent/JPS57108579A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57108579A (en) | 1982-07-06 |
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