JP6065594B2 - Combustion ash treatment method and cement production method - Google Patents

Combustion ash treatment method and cement production method Download PDF

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JP6065594B2
JP6065594B2 JP2013001792A JP2013001792A JP6065594B2 JP 6065594 B2 JP6065594 B2 JP 6065594B2 JP 2013001792 A JP2013001792 A JP 2013001792A JP 2013001792 A JP2013001792 A JP 2013001792A JP 6065594 B2 JP6065594 B2 JP 6065594B2
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combustion ash
dust
method
water
cement
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JP2014133676A (en
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眞一 濱平
眞一 濱平
真史 西山
真史 西山
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住友大阪セメント株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Process efficiency
    • Y02P10/21Process efficiency by recovering materials
    • Y02P10/212Recovering metals from waste

Description

  The present invention relates to a method for treating combustion ash used in cement production and a method for producing cement using combustion ash treated by the treatment method as a raw material.

  In recent years, in cement manufacturing facilities, wastes such as heavy oil combustion ash, construction generated soil, sludge, dust, food waste, waste plastics, and the like have been used as raw fuel. However, with the increase in waste-based raw fuel in the cement production unit, the operational state of cement production facilities may become unstable due to the trace components contained in these wastes.

For example, when the concentration of vanadium in heavy oil combustion ash is high, metal corrosion (high temperature corrosion) that occurs at high temperatures occurs, which adversely affects the operation of cement production facilities.
Here, as a method of removing vanadium in heavy oil combustion ash, Non-Patent Document 1 proposes a method of oxidizing and leaching vanadium with hydrogen peroxide, extracting and separating it, and then recovering nickel and the like. Yes.
Non-Patent Document 2 proposes a method of removing vanadium by leaching with sodium hydroxide and hydrochloric acid.

Proceedings of the 12th Annual Meeting of the Waste Science Society of Japan 2001 Page 503 Process for recovering vanadium and nickel from heavy oil combustion ash National Institute of Advanced Industrial Science and Technology Metal Resources Report September 2011 Page 48 Special Feature Vanadium Resources Supply Potential (3) Vanadium Recovery from Heavy Oil Combustion Ash

  However, in both methods of Non-Patent Documents 1 and 2, the process may be complicated, and further improvement is necessary from the viewpoint of improving productivity.

  As described above, the present invention provides an efficient combustion ash treatment method that can easily remove vanadium in the combustion ash, which has an unfavorable effect on the cement production facility, and the combustion treated by the treatment method. It aims at providing the manufacturing method of the cement which used ash as a raw material.

  As a result of intensive studies to solve the above problems, the present inventors have found that vanadium in combustion ash can be easily removed by adding kiln dust to combustion ash and performing a predetermined treatment. I came up with it. That is, the present invention is as follows.

[1] A method for treating combustion ash used in cement production, wherein the combustion ash and kiln dust are added separately or simultaneously into water or an aqueous solution to perform a water washing treatment, and after the water washing treatment And a filtration step for filtering, and a method for treating combustion ash in which the amount of kiln dust added is 3 to 25% by mass relative to the total amount of combustion ash and kiln dust added.
[2] The combustion ash treatment method according to [1], wherein the chlorine concentration in the kiln dust is 3% by mass or more.
[3] The method for treating combustion ash according to [1] or [2], wherein the combustion ash is heavy oil combustion ash.
[4] The treatment of combustion ash according to any one of [1] to [3], wherein the kiln dust is at least one of desalted dust, dust collected from an electric dust collector, and dust collected from a bag filter. Method.
[5] A method for producing cement using, as a raw material, combustion ash treated by the combustion ash treatment method according to any one of [1] to [4].

  According to the present invention, when using combustion ash, vanadium in the combustion ash that has an unfavorable influence on the cement production facility can be easily removed, and the combustion ash treated by the treatment method can be easily removed. A method for producing cement using ash as a raw material can be provided.

It is a schematic diagram which illustrates a part of cement manufacturing equipment.

[1. Combustion ash treatment method]
The method for treating combustion ash according to the present invention is a method for treating combustion ash used for cement production, and includes a predetermined water washing step and a filtration step in this order. Hereinafter, each step will be described.

(1) Water washing process:
The water washing step is a step in which the combustion ash and kiln dust are added separately or simultaneously into water or an aqueous solution and subjected to a water washing treatment.
As the combustion ash, various combustion ash containing vanadium is used, and among them, heavy oil combustion ash is preferable. Heavy oil ash is discharged from heavy oil based fuel boiler or the like of the thermal power plant and various plants. Such combustion ash contains vanadium, and if it is contained in a large amount, it causes problems as described above, but also has utility value as a valuable metal. Therefore, if vanadium can be recovered from the combustion ash, it can be effectively utilized.

The kiln dust is preferably at least one of desalted dust, dust collected from an electric dust collector, and dust collected from a bag filter.
Desalted dust is dust obtained from a desalting bypass device. In order to remove volatile components such as chlorine that repeatedly concentrate and volatilize and condense between the cement kiln and the preheater, the desalination bypass device extracts chlorine from the kiln bottom of the cement kiln and cools it. compound to produce a desalted dust solidified volatile components mainly equal, by discharging the desalted dust out of the system, a device for removing chlorine from the cement kiln.

  In addition, the electrostatic precipitator collects fine dust with a relatively low pressure loss, and it is only necessary to effectively remove the fine particles in the exhaust gas. Instead of the electrostatic precipitator, an inertia precipitator or a centrifugal separator can be used. A force dust collector may be used.

The bag filter is dust that is fine particles contained in exhaust gas that has not been completely collected by the electric dust collector, for example, dust having an electrical resistance value outside the range of 10 4 to 5 × 10 10 Ω · cm. A filter made of a heat-resistant material is used for collecting dust that is difficult to be charged, nonionic dust, and the like.

  The amount of kiln dust added to the total amount of combustion ash and kiln dust is 3 to 25% by mass, preferably 7 to 18 parts by mass, and more preferably 8 to 11 parts by mass. The aqueous solution used in the water washing step is not particularly limited as long as it can elute vanadium and keep it in an ionic state.

Moreover, it is preferable that the chlorine concentration in kiln dust is 3 mass% or more, and it is more preferable that it is 7-30 mass%. When the chlorine concentration is 5% by mass or more, the dissolution efficiency of vanadium can be further increased. Chlorine concentration can be measured by ion chromatography.
Here, when kiln dust is used, it is preferable to use at least desalted dust in consideration of reactivity with combustion ash and detergency in the water washing step described later.

  Since kiln dust also contains alkali components (potassium, sodium, calcium, etc.), vanadium in the combustion ash can be easily dissolved in water by the influence of the components. Moreover, since chlorine in kiln dust is also removed by washing, the precipitate that has undergone the filtration process described later can be used almost as it is in a cement production facility.

The washing method is not particularly limited, and examples thereof include a dissolving tank equipped with a stirrer filled with water, showering on a vibrating sieve, trommel, and an aggregate washing machine. Especially, the water washing process in the dissolution tank with a stirrer filled with water is preferable.
Prior to the water washing treatment, combustion ash and kiln dust may be added to water or an aqueous solution after mixing them, or after adding combustion ash or kiln dust to water or an aqueous solution, kiln dust or combustion ash is further added. It may be added.

  The pH of the treatment liquid containing the mixture when washed with water is preferably 8 to 11, more preferably 9 to 11, and still more preferably 9.5 to 10.5. By setting the pH to 8 to 11, dissolution of vanadium can be more efficiently promoted.

(2) Filtration process:
A filtration process is a process of filtering the mixture after a water-washing process. A well-known means can be used about the filtration method.

  By passing through the above processes, the combustion ash raw material in which the amount of vanadium in the combustion ash is reduced is manufactured. Further, as described above, each process mainly includes simple operations such as water washing and filtration, so that cost reduction can be realized. Furthermore, it can be said to be an efficient process in terms of effective use of kiln dust.

[2. Cement manufacturing method]
The method for producing cement according to the present invention is a method for producing cement by using the combustion ash treated by the method for treating combustion ash as described above as a part of the raw material. Hereinafter, although the manufacturing method of the cement of this invention is demonstrated with reference to FIG. 1, this invention is not limited to the said description.

  In the embodiment shown in FIG. 1, the kiln dust is a gas exhausted from a desalting bypass device (not shown) provided at the bottom of the kiln 3 for extracting chlorine and the top of the suspension preheater 1 of the cement manufacturing facility. Dust collected by introducing combustion gas discharged from the upper cyclone 1d into one or more of the stabilizer 5, the electrostatic precipitator 6, and the bag filter 7 is used.

  Then, a predetermined amount of new water, for example, 2 to 6 times as much fresh water as the above-described combustion ash and kiln dust described above is poured into the water washing tank 8 and stored, and a predetermined amount of combustion ash and Kiln dust is added, immersed and stirred and washed with water to obtain a slurry (or aqueous solution) in which water-soluble components including vanadium are eluted in water (water washing step).

In this washing step, the temperature in the washing tank 8 may be set to 40 ° C. or higher in order to increase the dissolution rate of the water-soluble component containing vanadium. The stirring time is preferably 1 to 5 hours, but long-time stirring is not preferable because a salt containing calcium or the like contained in kiln dust may be generated and precipitates may be formed.
Moreover, it is preferable to make the pH of the process liquid in this water washing process into the range as stated above.

Next, the slurry (or aqueous solution) containing vanadium discharged from the washing tank 8 is introduced into the filter 9 and separated into a filtrate containing cake (solid content) and vanadium by a filter (filtration process).
During the separation, it is preferable to wash the water-soluble component containing vanadium remaining in the cake in the filter 9 with fresh water. The cleaning using the fresh water can be performed efficiently with a small amount of water by pumping the fresh water from one direction to the cake while the filter 9 is pressurized. The fresh water used for this washing is preferably 0.5 to 2.0 times by weight the amount of dust washed.

By washing with this new water, water-soluble components including vanadium remaining in the cake can be sufficiently removed.
Moreover, since the obtained cake has a relatively low moisture content, it is directly sent to a cement production facility and mixed with other cement raw materials. After drying and grinding, the cake is used as a powder cement raw material in the cement firing process. . That is, together with other raw materials, the cement clinker is made through the suspension preheater 1, the calcining furnace 2, the cement kiln 3, and the clinker cooler 4. And a cement is manufactured through a known process.

  Hereinafter, the present invention will be specifically described, but the present invention is not limited thereto.

[Examples 1-4 and Comparative Examples 1-3]
Desalted dust having the composition shown in Table 1 below and heavy oil combustion ash having the composition shown in Table 2 below were mixed so that the added amount of the desalted dust was in the ratio shown in Table 3 to prepare a mixture.
Water washing was performed by adding 1 kg of the mixture to 4 liters of tap water and stirring for 1 hour. At this time, pH was measured with a pH meter (measured values are shown in Table 3 below).

  Then, it filtered using the magnetic filter, the vanadium density | concentration in a filtrate was measured by ICP, and the dissolution rate was calculated | required. The results are shown in Table 3 below.

1 Suspension preheater 1d Cyclone 2 Calciner 3 Cement kiln 4 Clinker cooler 5 Stabilizer 6 Electric dust collector (EP)
7 Bag filter 8 Flushing tank 9 Filter

Claims (4)

  1. Thermal power plant or is discharged from the boiler plant, a processing method for combustion ashes of heavy oil fuels containing vanadium,
    A water washing step in which the combustion ash is added to water or an aqueous solution to perform a water washing treatment, and a filtration step in which filtration is performed after the water washing treatment,
    The water washing step is a method for treating combustion ash using cement kiln dust to adjust the pH of the water or aqueous solution during washing of the combustion ash to 8 to 11.
  2. The method for treating combustion ash according to claim 1, wherein the chlorine concentration in the cement kiln dust is 3 mass% or more.
  3. The method for treating combustion ash according to claim 1 or 2, wherein the cement kiln dust is at least one of desalted dust, dust collected from an electric dust collector, and dust collected from a bag filter.
  4.   The manufacturing method of the cement which uses the combustion ash processed by the processing method of the combustion ash of any one of Claims 1-3 as a part of raw material.
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Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
JPS5216720B2 (en) * 1973-05-29 1977-05-11
US4539186A (en) * 1984-03-15 1985-09-03 Intevep, S.A. Method for leaching and recovering vanadium from vanadium bearing by-product materials
JPH059157B2 (en) * 1986-06-17 1993-02-04 Kashima Kita Kyodo Hatsuden Kk
JP4013171B2 (en) * 1998-01-27 2007-11-28 太平洋セメント株式会社 Processing method for heavy oil combustion ash
JP4013172B2 (en) * 1998-02-23 2007-11-28 太平洋セメント株式会社 Processing method for heavy oil combustion ash
JP3831805B2 (en) * 1999-12-28 2006-10-11 太平洋セメント株式会社 Treatment method for petroleum combustion ash
JP3780359B2 (en) * 2000-11-30 2006-05-31 太平洋セメント株式会社 Treatment method for petroleum combustion ash
WO2003072275A1 (en) * 2002-02-27 2003-09-04 Kashima-Kita, Electric Power Corporation Wet method for treating petroleum-originated combustion ash
JP2005125234A (en) * 2003-10-23 2005-05-19 Sumitomo Osaka Cement Co Ltd Dust collecting apparatus and dust collecting method of cement production facility
CN101528953B (en) * 2006-10-24 2011-10-19 太平洋水泥株式会社 Method for removing lead from cement kiln
KR101658125B1 (en) * 2010-02-16 2016-09-20 다이헤이요 세멘토 가부시키가이샤 Washing method for incineration ash and dust in combustion gas extracted from cement kiln
WO2013066942A1 (en) * 2011-10-31 2013-05-10 Saudi Arabian Oil Company Utilization of heavy oil ash to produce high quality concrete

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