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Floatation separation apparatus, method of floatation separation, and method of manufacturing products using the same

外国特許コード F120006731
整理番号 B35-05WO
掲載日 2012年5月28日
出願国 アメリカ合衆国
出願番号 201013384543
公報番号 20120111436
公報番号 9174856
出願日 平成22年7月15日(2010.7.15)
公報発行日 平成24年5月10日(2012.5.10)
公報発行日 平成27年11月3日(2015.11.3)
国際出願番号 JP2010061989
国際公開番号 WO2011007837
国際出願日 平成22年7月15日(2010.7.15)
国際公開日 平成23年1月20日(2011.1.20)
優先権データ
  • 特願2009-168346 (2009.7.17) JP
  • 2010JP061989 (2010.7.15) WO
発明の名称 (英語) Floatation separation apparatus, method of floatation separation, and method of manufacturing products using the same
発明の概要(英語) By storing a liquid to be treated in a treatment tank main body 10 having a bottom portion 10g that narrows downward, with particles of materials to be treated dispersed therein, taking out the liquid to be treated from a position lower than the liquid level of the treatment tank main body 10, and returning the liquid to the bottom portion 10g of the treatment tank main body 10, thereby circulating the liquid to be treated while forming a vortex flow within the treatment tank main body 10, and at the same time supplying air bubbles from the lower part of the treatment main unit 10, a first component contained in froths is separated from a second component, which is less susceptible to floatation, contained in the liquid to be treated.
従来技術、競合技術の概要(英語) BACKGROUND ART
Fly ash discharged in large amounts as a byproduct from a pulverized coal firing boiler of a thermal power plant, etc. is used in many fields, as a cement raw material, for example.
Fly ash usually contains unburnt carbon.
It is known that if the unburnt carbon content is high, unburnt carbon-related problems may arise.
For example, when fly ash is used as a cement admixture, high fly ash content may increase the usage of admixtures such as AE agent, cause black portions to appear on a hardened material, or physical properties of the hardened material may degrade.
For these reasons, fly ash has not been used in large amounts.
To solve these problems, some methods of reforming fly ash by decreasing unburnt carbon contained in fly ash have been presented.
For example, a method of separating unburnt carbon by floatation separation using the difference in wettability between unburnt carbon and ash content is known.
With the method and device for stabilizing coal ash for concrete disclosed in Patent Literature 1, a cylindrical slurry mixer shown in FIG. 3 of Patent Literature 1 is used.
This slurry mixer includes a feed pipe for supplying coal ash, water filling pipe, bubble discharge pipe, air pressure-feed pipe, ash discharge pipe, pipe for discharging iron content, and agitation plate having perforated rotating plates and integrating an electrical magnet.
Each pipe is equipped with a control valve.
In Patent Literature 1, water containing coal ash and a surface active agent is fed into the slurry mixer, and the mixture is agitated using the agitation plate while air is pressure-fed into the slurry mixer to generate bubbles.
Carbon dioxide in air is used to decrease the basicity of highly alkaline fly ash, and iron content is separated using the magnet included in the agitation plate.
While the above operations are performed, unburnt carbon is separated, entrained in bubbly ash discharged.
The unburnt carbon removing method disclosed in Patent Literature 2 adds water to fly ash to make a slurry mixture.
Using the shearing force of agitation blades rotating at high speed in a surface modification device, activation energy is generated on the surface of unburnt carbon to allow the unburnt carbon to have lipophilic property, and make a collecting agent attach to the lipophilic unburnt carbon.
The unburnt carbon is then made to attach to air bubbles by using a floatation machine to cause floatation separation to occur, and the unburnt carbon in fly ash can thus be separated.
The floatation machine shown in FIGS. 4 and 5 in Patent Literature 2 includes a plurality of chambers created by dividing a tank with partition walls, an agitator provided within each chamber, an external pipe including an air induction pipe and a hood installed around each agitator, a froth discharge path provided on both sides of the tank, and a plurality of waterwheel-shaped froth scrapers.
With this floatation machine, the slurry supplied through the slurry inlet on the upstream end face flows into the chambers separated with the partition walls.
The slurry is agitated in each chamber by the agitators, and air is sucked in through the air induction pipe to generate air bubbles.
Unburnt carbon attaching to these air bubbles goes up, is scraped to outside the tank with the froth scrapers, flows down to the froth discharge path, and then discharged to outside the machine through an aggregated froth path.
The fly ash remaining within the tank is discharged with water to outside the machine as tails through a takeout port on the downstream end face.

CITATION LIST

Patent Literature
Patent Literature 1: JP 4210358 B, FIG. 3
Patent Literature 2: JP 2007-167825 A, FIGS. 4 and 5

特許請求の範囲(英語) [claim1]
1. A floatation separation apparatus, comprising: a treatment tank main body having a downward narrowing bottom portion, a tank main body circulation outlet and a tank main body circulation inlet, the treatment tank storing a liquid to be treated in which particles of fly ash including unburnt carbon are dispersed;
a froth overflow means installed in an upper portion of the treatment tank main body;
a circulating means for taking out the liquid to be treated from the outlet for circulation and for returning the liquid to the downwardly narrowing bottom portion, thereby circulating the liquid to be treated, and for returning the liquid in the circulation means through said circulation inlet along the internal peripheral surface of the downward narrowing bottom portion, and for forming a vortex flow within the treatment tank main body; and
a foaming device for supplying air bubbles into the circulation liquid between the circulation inlet and circulation outlet,
wherein the outlet for circulation is installed into the upper portion of the main tank body and below said froth overflow means,
wherein by forming the vortex flow by the circulating means while supplying the air bubbles to the circulated liquid by the foaming device, the unburnt carbon contained in the fly ash particles is made to attach to the air bubbles within the treatment tank main body and goes up to a liquid surface at said upper end portion of the tank main body as froths, due to difference in surface wettability between the unburnt carbon and the fly ash in the treatment tank main body.
[claim2]
2. The floatation separation apparatus as set forth in claim 1, wherein the foaming device is made of ejectors.
[claim3]
3. The floatation separation apparatus as set forth in one of claims 1 or 2, wherein the foaming device is capable of supplying micro bubbles into the circulating liquid in said circulation means.
[claim4]
4. The floatation separation apparatus as set forth in claim 3, wherein the froth overflow means includes a narrowing portion that narrows upward, installed at the upper portion of the treatment tank main body, and a froth overflow port installed at the upper end of the narrowing portion.
[claim5]
5. The floatation separation apparatus as set forth in claim 4, wherein the treatment tank main body is equipped with a water adding means, and the level of the liquid to be treated can be adjusted by adding water from the water adding means.
[claim6]
6. The floatation separation apparatus as set forth in claim 1, wherein the foaming device is a suction foaming device.
[claim7]
7. The floatation separation apparatus as set forth in claim 1, further comprising a pretreatment device and a concentrating device.
[claim8]
8. The floatation separation apparatus as set forth in claim 7, wherein the pretreatment device is a mixer which is used to turn the fly ash into uniform slurry.
[claim9]
9. The floatation separation apparatus as set forth in claim 7, wherein the concentrating device concentrates a tail ash suspension liquid, which is obtained from the treatment tank main body.
[claim10]
10. The floatation separation apparatus as set forth in claim 7, wherein the concentrating device is a precipitation equipment or a filter press.
  • 発明者/出願人(英語)
  • MATSUFUJI YASUNORI
  • TAKASU KOJI
  • TATSUMI KIYOTAKA
  • KITAKYUSHU SCIENCE AND RESEARCH PARK
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 137/806
参考情報 (研究プロジェクト等) SORST Selected in Fiscal 2002
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