JPH046971B2 - - Google Patents
Info
- Publication number
- JPH046971B2 JPH046971B2 JP2601084A JP2601084A JPH046971B2 JP H046971 B2 JPH046971 B2 JP H046971B2 JP 2601084 A JP2601084 A JP 2601084A JP 2601084 A JP2601084 A JP 2601084A JP H046971 B2 JPH046971 B2 JP H046971B2
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- concentration
- adjusting
- value
- constant
- 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
- 239000002002 slurry Substances 0.000 claims description 64
- 238000000034 method Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000010979 pH adjustment Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000003002 pH adjusting agent Substances 0.000 description 3
- 238000001139 pH measurement Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Accessories For Mixers (AREA)
- Control Of Non-Electrical Variables (AREA)
Description
【発明の詳細な説明】
本発明は高濃度スラリーのPHを連続的に調整す
る方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously adjusting the pH of a highly concentrated slurry.
一般に、化学的製造操作として特定の不溶固体
分を含む高濃度スラリーを処理して、スラリー濃
度を一定に調整しながら、液のPHを所望の値に調
整する工程を必要とする場合がある。ここで云う
高濃度スラリーとは、不溶固体濃度100ｇ／以
上のスラリーを指し、屡々その数倍の濃度に及
び、不溶固体分の性質にもよるが、その取扱いに
は濃度増大と共にかなりの困難を倶なう。 Generally, as a chemical manufacturing operation, it may be necessary to process a highly concentrated slurry containing a specific insoluble solid content to adjust the pH of the liquid to a desired value while adjusting the slurry concentration to a constant value. The term "highly concentrated slurry" as used herein refers to a slurry with an insoluble solids concentration of 100 g/min or more, often reaching several times that concentration, and depending on the nature of the insoluble solids, its handling can be quite difficult as the concentration increases. Let's cry.
従来、高濃度スラリーのPH調整には、(1)高濃度
スラリーに直接、PH測定用電極を浸漬してPHを測
定するか、或は(2)高濃度スラリーの一部を過
し、その液のPHを測定した後、PH調整剤を添加
して所定のPH値を保持させる方法が実用されてい
る。 Conventionally, to adjust the pH of high concentration slurry, (1) immerse a pH measuring electrode directly into the high concentration slurry to measure the PH, or (2) sieve a portion of the high concentration slurry and measure the PH. A method of measuring the pH of a liquid and then adding a pH adjuster to maintain a predetermined pH value has been put into practice.
しかしながら、上記(1)の場合は、PH電極に固形
物が付着してPH測定値が不正確となり、調整槽内
のPH変動が著しいだけでなく、PH電極が短時間で
汚染されるため電極を屡々洗浄する必要がある。
また上記(2)の場合は、供給されるスラリー濃度が
変化したり、スラリーの不溶固体分が添加したPH
調整剤に対し緩衝作用を有する場合等にはPH調整
剤の添加量が一定せず、したがつてPH値も大きく
変動するため、PH値を一定値に調整することは困
難となつて、PH調整剤の過剰使用などの欠点があ
る。 However, in the case of (1) above, solid matter adheres to the PH electrode, making the PH measurement value inaccurate, and not only does the pH fluctuation in the adjustment tank become significant, but the PH electrode becomes contaminated in a short time, so the electrode need to be washed frequently.
In addition, in the case of (2) above, the concentration of the slurry supplied may change, or the insoluble solid content of the slurry may
When the pH regulator has a buffering effect, the amount of the pH regulator is not constant and the pH value fluctuates greatly, making it difficult to adjust the pH value to a constant value. There are drawbacks such as excessive use of regulators.
本発明の目的は、上記の欠点をなくし供給され
る各種の高濃度スラリーのPH調整を安定かつ連続
的に行うことができる方法を提供することにあ
る。 An object of the present invention is to provide a method capable of eliminating the above-mentioned drawbacks and stably and continuously adjusting the pH of various high-concentration slurries to be supplied.
本発明者等は、この目的に対して鋭意研究の結
果、スラリー濃度を一定に保持しつつ、PH調整後
のスラリーの液のPHを測定し、その値を入力信
号に変換させた後、指示調節計を介してPH調整剤
の添加量を一定時間毎あるいは連続的に決定し、
常に適切な量のPH調整剤の添加により該スラリー
のPHを調整する方法を見出した。そして、この方
法によれば供給原料スラリーの濃度の変動あるい
はスラリーの種類に関係なく、所望の安定したPH
値を有する一定濃度の高濃度スラリーを連続的に
処理することができることを確認した。 As a result of intensive research for this purpose, the present inventors measured the pH of the slurry liquid after pH adjustment while keeping the slurry concentration constant, converted the value into an input signal, and then The amount of PH adjuster added is determined via a controller at regular intervals or continuously.
We have found a method for adjusting the PH of the slurry by always adding an appropriate amount of PH adjuster. According to this method, the desired stable pH can be achieved regardless of fluctuations in the concentration of the feedstock slurry or the type of slurry.
It was confirmed that it is possible to continuously process a high concentration slurry having a constant concentration.
即ち、本発明によれば、一定水位で溢流させる
ことができかつモーター駆動型攪拌機で攪拌され
ているPH調整槽中に連続的に高濃度スラリーを供
給し、該PH調整槽中のスラリー濃度を一定に調整
しながらPH調整剤を連続的または非連続的に添加
して該スラリーのPHを所定値に保持しつつ溢流す
るスラリーを回収する高濃度スラリーのPH調整方
法であつて、前記スラリー濃度の調整を前記モー
ター駆動型攪拌機のモーター電流値によつて定ま
る一定のスラリー濃度となるように水を供給する
ことによつて行い、前記PH調整剤の添加量を前記
溢流するスラリーの過液のPH測定値に応答する
入力信号によつて所定PH値となるように調整する
ことを特徴とする高濃度スラリーのPH調整方法が
提供される。 That is, according to the present invention, a highly concentrated slurry is continuously supplied into a PH adjustment tank which can overflow at a constant water level and is stirred by a motor-driven stirrer, and the slurry concentration in the PH adjustment tank is adjusted. A method for adjusting the pH of a highly concentrated slurry, in which the overflowing slurry is recovered while maintaining the pH of the slurry at a predetermined value by continuously or discontinuously adding a pH adjuster while adjusting the pH of the slurry to a certain value, the method comprising: The slurry concentration is adjusted by supplying water to a constant slurry concentration determined by the motor current value of the motor-driven stirrer, and the amount of the PH adjuster added is adjusted to the overflowing slurry. A method for adjusting the pH of a highly concentrated slurry is provided, which is characterized in that the pH is adjusted to a predetermined pH value using an input signal responsive to a measured pH value of the superfluid.
以下に、添付図面を参照して本発明を説明す
る。 The invention will now be described with reference to the accompanying drawings.
第１図は本発明を実施するための装置およびそ
の配置の概要を説明するフローシートである。PH
調整槽１はモーター駆動型攪拌機２によつて攪拌
されており、供給原料の高濃度スラリー導入管１
０およびスラリー濃度調整用の水導入管９が該槽
１内にそれぞれ開口されている。モーター駆動型
攪拌機２は減速機３によつて回転する攪拌羽根４
によつてPH調整槽中のスラリーを攪拌する。第１
図ではこのスラリーの攪拌時に生じる機械的攪拌
抵抗がモーター電流Ａと極めて相関性のあること
に着目して前記スラリー濃度調整用の水導入管の
供給量を制御する措置が施こされている。即ち、
攪拌機の給電回路５からの電流値は電流交換器６
で指示調節計７の入力信号に変換され、これによ
つてスラリー濃度調整用水導入管の給水調節弁８
を作動させるようになつている。 FIG. 1 is a flow sheet outlining an apparatus and its arrangement for carrying out the present invention. PH
The adjustment tank 1 is stirred by a motor-driven stirrer 2, and a highly concentrated slurry introduction pipe 1 of the feed material
0 and a water inlet pipe 9 for adjusting slurry concentration are opened into the tank 1, respectively. The motor-driven stirrer 2 has stirring blades 4 rotated by a speed reducer 3.
Stir the slurry in the PH adjustment tank. 1st
In the figure, attention is paid to the fact that the mechanical stirring resistance generated when stirring the slurry is highly correlated with the motor current A, and measures are taken to control the amount of water supplied from the water introduction pipe for adjusting the slurry concentration. That is,
The current value from the power supply circuit 5 of the stirrer is determined by the current exchanger 6.
is converted into an input signal for the indicating controller 7, and thereby the water supply control valve 8 of the water introduction pipe for adjusting the slurry concentration is
It is starting to operate.
第２図は酸化亜鉛のスラリー濃度と攪拌機のモ
ーター電流との関係をグラフに示したものであ
る。図に示すようにスラリー濃度ｇ／とモータ
ー電流Ａとの間には比例関係が成立している。し
たがつて、この一連の装置によつて攪拌機駆動電
流を一定に保持するように給水量を制御して一定
濃度のスラリーを得ることができ、供給スラリー
濃度が変動しても特に支障は生じない。 FIG. 2 is a graph showing the relationship between the zinc oxide slurry concentration and the stirrer motor current. As shown in the figure, a proportional relationship exists between the slurry concentration g/ and the motor current A. Therefore, by using this series of devices, it is possible to obtain a slurry of a constant concentration by controlling the amount of water supplied so as to maintain the agitator driving current constant, and there is no particular problem even if the supplied slurry concentration fluctuates. .
処理された一定濃度を有する高濃度スラリーは
PH調整槽１から溢流管１３を介して取出される。
スラリーの使用目的に応じて過機１４で過し
て液とケーキに分離されるか、或いはそのまま
次工程に送られるが、本発明のPH調整方法の実施
には、溢流スラリーの少くとも一部は過されて
PH検出槽１５に送られ、そこでPH計１６によりPH
測定が行われる。PH計１６で測定された出力は発
振器１７から変換器１８で指示調節計２０の入力
信号に変換される。入力信号は記録計１９を経て
指示調節計２０に入り、この指示信号に基づい
て、PH調整剤の貯槽１１からのPH調整剤の定量切
出しコンベヤ１２の作動を制御してPH調整槽に供
給される調整剤の量が調節され、PH調整槽内のス
ラリーのPH値を所定の値に保持することができ
る。 A highly concentrated slurry with a constant concentration that has been processed is
It is taken out from the PH adjustment tank 1 via an overflow pipe 13.
Depending on the intended use of the slurry, it may be filtered through the filter 14 to separate it into a liquid and a cake, or it may be sent to the next process as it is. part has passed
It is sent to the PH detection tank 15, where the PH is measured by the PH meter 16.
Measurements are taken. The output measured by the PH meter 16 is converted from the oscillator 17 to the input signal of the indicating controller 20 by the converter 18 . The input signal passes through the recorder 19 and enters the indicator controller 20. Based on this instruction signal, the operation of the conveyor 12 for cutting out a fixed amount of the PH adjuster from the PH adjuster storage tank 11 is controlled, and the PH adjuster is supplied to the PH adjuster tank. The amount of the adjusting agent used is adjusted, and the pH value of the slurry in the pH adjusting tank can be maintained at a predetermined value.
本発明によれば、前述のようにPH調整槽内のス
ラリー濃度を確実に一定に保持することができ、
原料スラリー中に含有される固形物がPH調整剤に
対し緩衝作用を有する場合があつても、調整剤の
添加量の変動幅を小さくすることができる。ま
た、高濃度スラリーのPH調整がスラリーの液に
ついて行うPH測定によつて行われるので、PH調整
を正確かつ安定して迅速に行うことができ、PH測
定電極の洗浄頻度を大幅に減少させる利点が得ら
れる。 According to the present invention, as described above, the slurry concentration in the PH adjustment tank can be reliably maintained at a constant level,
Even if the solids contained in the raw material slurry have a buffering effect on the pH adjuster, the range of fluctuation in the amount of the adjuster added can be reduced. In addition, since PH adjustment of highly concentrated slurry is performed by measuring the PH of the slurry liquid, PH adjustment can be performed accurately, stably, and quickly, which has the advantage of significantly reducing the frequency of cleaning the PH measurement electrode. is obtained.
以下、実施例によつて本発明の効果を明らかに
する。 Hereinafter, the effects of the present invention will be clarified through Examples.
実施例 １
第１図に示したフローシートに準じて本発明を
実施する。PH調整槽１の容量は25m3であり、モー
ター駆動型攪拌機２の回転数は62rpmである。原
料スラリー導入管１０からZnO濃度500〜700ｇ／
のスラリーを１時間当り12m3の割合で連続的に
導入する。該攪拌機のモーターに流れる電流が
40Aとなるように水導入管９から水を添加し、炭
酸ナトリウム粉末をPH調整剤として使用し、容量
0.5m3のPH検出槽１５内のPH測定値が9.0を示す量
で添加してスラリーを処理した。処理済みのスラ
リーは溢流管１３を経て過面積70m2のドラムフ
イルタで過した。Example 1 The present invention was carried out according to the flow sheet shown in FIG. The capacity of the PH adjustment tank 1 is 25 m 3 , and the rotation speed of the motor-driven stirrer 2 is 62 rpm. ZnO concentration 500-700g/from raw material slurry introduction pipe 10
of slurry was introduced continuously at a rate of 12 m 3 per hour. The current flowing through the stirrer motor is
Add water from the water inlet pipe 9 so that the current is 40A, use sodium carbonate powder as a PH adjuster, and adjust the capacity.
The slurry was treated by adding it in an amount such that the pH measurement value in the 0.5 m 3 PH detection tank 15 was 9.0. The treated slurry passed through an overflow pipe 13 and passed through a drum filter with a surface area of 70 m 2 .
この操作を８時間連続して行い、30分毎に原料
スラリー導入管１０の出口と、溢流管１３の出口
とからそれぞれ試料を採取して、それぞれのスラ
リー濃度とPH値を測定した。その結果を第３図に
示した。第３図には処理の経過時間に対する不溶
固体濃度（ｇ／）とPH値との関係がグラフで示
されている。図中の〓〓および〓〓はそれぞれ原
料スラリーおよび処理スラリーのスラリー濃度と
PH値の変化を表わしている。 This operation was carried out continuously for 8 hours, and samples were taken from the outlet of the raw material slurry introduction pipe 10 and the outlet of the overflow pipe 13 every 30 minutes, and the slurry concentration and PH value of each sample were measured. The results are shown in Figure 3. FIG. 3 shows a graph of the relationship between the concentration of insoluble solids (g/) and the PH value with respect to the elapsed time of the treatment. 〓〓 and 〓〓 in the figure are the slurry concentrations of the raw slurry and the treated slurry, respectively.
It shows the change in PH value.
第３図から判るように、本発明によつて処理し
た高濃度スラリーは目標とするPH値9.0に対し±
0.10程度に調整されており、PH検出槽の電極は殿
物などで汚染されることなく常に正常値を示し
た。 As can be seen from Figure 3, the high concentration slurry treated according to the present invention has a pH value of ±
The pH was adjusted to around 0.10, and the electrodes in the PH detection tank were not contaminated with sediment and always showed normal values.
実施例 ２
鉛、亜鉛を含有する鉱石を焼結した後、I.S.P.
方式（Pb，Zn同時精錬炉）溶鉱炉で処理した際
に発生した煙灰を水洗浄し、得られた不溶固体濃
度200〜300ｇ／、PH6.8のスラリーを使用し、
実施例１と同様の操作でPH8.5に設定してPH調整
を行つた。結果は実施例１と同様に好結果を示し
た。Example 2 After sintering ore containing lead and zinc, ISP
Method (Pb, Zn simultaneous refining furnace) The smoke ash generated during processing in a blast furnace is washed with water, and the resulting slurry with an insoluble solid concentration of 200 to 300 g/PH6.8 is used.
The pH was adjusted to 8.5 using the same procedure as in Example 1. The results showed good results similar to those in Example 1.
なお、本発明は、酸化還元電位の測定、調整な
どのプロセスに応用することもできる。 Note that the present invention can also be applied to processes such as measurement and adjustment of redox potential.
第１図は本発明の実施に使用される装置とその
配置の概略を示すフローシートである。第２図は
酸化亜鉛のスラリー濃度と攪拌機モーター電流と
の関係を示すグラフである。第３図は本発明の処
理の経過時間に対する不溶固体濃度とPH値の測定
結果を示すグラフである。
１……PH調整槽、２……モーター駆動型攪拌
機、９……水導入管、１０……高濃度スラリー導
入管、１１……貯槽、１３……溢流管、１４……
過機、１５……PH検出槽。
FIG. 1 is a flow sheet showing an outline of the equipment and its arrangement used to carry out the present invention. FIG. 2 is a graph showing the relationship between zinc oxide slurry concentration and stirrer motor current. FIG. 3 is a graph showing the measurement results of insoluble solid concentration and PH value with respect to the elapsed time of the treatment of the present invention. 1...PH adjustment tank, 2...Motor-driven agitator, 9...Water introduction pipe, 10...High concentration slurry introduction pipe, 11...Storage tank, 13...Overflow pipe, 14...
15...PH detection tank.
Claims (1)
ー駆動型攪拌機で攪拌されているPH調整槽中に連
続的に高濃度スラリーを供給し、該PH調整槽中の
スラリー濃度を一定に調整しながらPH調整剤を連
続的または非連続的に添加して該スラリーのPHを
所定値に保持しつつ溢流するスラリーを回収する
高濃度スラリーのPH調整方法であつて、上記スラ
リー濃度の調整を上記モーター駆動型攪拌機のモ
ーター電流値によつて定まる一定のスラリー濃度
となるように水を供給することによつて行い、上
記PH調整剤の添加量を上記溢流するスラリーの
過液のPH測定値に応答する入力信号によつて所定
PH値となるように調整することを特徴とする高濃
度スラリーのPH調整方法。1. Continuously supply high concentration slurry into a PH adjustment tank that can overflow at a constant water level and is stirred by a motor-driven stirrer, and adjust the slurry concentration in the PH adjustment tank to a constant level while adjusting the PH. A method for adjusting the pH of a highly concentrated slurry in which overflowing slurry is recovered while maintaining the pH of the slurry at a predetermined value by continuously or discontinuously adding a regulator, the method comprising: adjusting the slurry concentration using the motor; This is done by supplying water to maintain a constant slurry concentration determined by the motor current value of the drive type stirrer, and adjusting the amount of the PH adjuster added to the PH value of the overflowing slurry. determined by the input signal to which it responds
A method for adjusting the PH of a highly concentrated slurry, which is characterized by adjusting the PH value so that the PH value is the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2601084A JPS60171513A (en) | 1984-02-16 | 1984-02-16 | Ph control method of high density slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2601084A JPS60171513A (en) | 1984-02-16 | 1984-02-16 | Ph control method of high density slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60171513A JPS60171513A (en) | 1985-09-05 |
| JPH046971B2 true JPH046971B2 (en) | 1992-02-07 |
Family
ID=12181726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2601084A Granted JPS60171513A (en) | 1984-02-16 | 1984-02-16 | Ph control method of high density slurry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60171513A (en) |
-
1984
- 1984-02-16 JP JP2601084A patent/JPS60171513A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60171513A (en) | 1985-09-05 |
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