KR20140087403A - Method for recovery of iron oxide in bottom ash from power plant - Google Patents

Method for recovery of iron oxide in bottom ash from power plant Download PDF

Info

Publication number
KR20140087403A
KR20140087403A KR1020120157609A KR20120157609A KR20140087403A KR 20140087403 A KR20140087403 A KR 20140087403A KR 1020120157609 A KR1020120157609 A KR 1020120157609A KR 20120157609 A KR20120157609 A KR 20120157609A KR 20140087403 A KR20140087403 A KR 20140087403A
Authority
KR
South Korea
Prior art keywords
iron oxide
power plant
thermal power
specific gravity
air
Prior art date
Application number
KR1020120157609A
Other languages
Korean (ko)
Inventor
한기천
Original Assignee
재단법인 포항산업과학연구원
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 재단법인 포항산업과학연구원 filed Critical 재단법인 포항산업과학연구원
Priority to KR1020120157609A priority Critical patent/KR20140087403A/en
Publication of KR20140087403A publication Critical patent/KR20140087403A/en

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present invention relates to a method used to recover the iron oxide substances included in a floor material of a thermal power plant. The method used to recover iron oxide substances included in a floor material of a thermal power plant according to an embodiment of the present invention includes the steps of: grinding the floor material of the thermal power plant; and separating the iron oxide substances in the ground floor material by using the weight difference of the ground floor material.

Description

METHOD FOR RECOVERY OF IRON OXIDE IN BOTTOM ASH FROM POWER PLANT FIELD OF THE INVENTION [0001]

The present invention relates to a method for recovering iron oxide from a bottom of a thermal power plant, and more particularly, to a method for recovering iron oxide using a difference in specific gravity of a mineral phase contained in a bottom of a thermal power plant.

The amount of ash generated from thermal power plants is divided into fly ash and bottom according to their location. Among them, bottom ash is adhered to the bottom wall of the power plant boiler, superheater, reheater, and then falls down to the bottom of the boiler by its own weight. Generally, its particle size is about 1 ~ 2.5mm, which accounts for about 20% of the total generated coal ash.

In other words, the bottom ash is ashed down ash when the coal is burned in the boiler. Unlike fly ash, the shape and composition are uneven, and it is limited to be used as a raw material for recycling.

The recycling method of flooring has been proposed in the fields of natural aggregate, lightweight concrete, architecture, civil engineering, etc. However, there is almost no actual recycling case. Although flooring accounts for about 20% of the total coal ash, considering the increasing trend every year, it is expected that the flooring material will also occupy a considerable amount in the future. Therefore, it is necessary to study the whole recycling technology of coal ash.

Korean Patent Laid-Open No. 10-2011-0023024 discloses a technology for grinding a bottom material and separating spherical iron oxide through wet magnetic force sorting among technologies for recycling the bottom material. However, since iron oxide contained in the bottom material contains Fe 2 O 3 having non-magnetic property, there is a problem that iron oxide can not be effectively recovered by the magnetic separation method.

It is an object of the present invention to provide a method for efficiently separating and recovering iron oxide from a bottom ash generated from a coal-fired power plant.

In order to achieve the above object, a method of recovering iron oxide in a bottom of a thermal power plant according to an embodiment of the present invention includes a step of crushing a thermal power plant floor material and a step of separating the iron oxide material using the difference in specific gravity .

The pulverizing step may be to pulverize the thermal power plant flooring material to a diameter of 0.15 mm or less.

The step of separating the iron oxide is carried out by separating the iron oxide by the air separator in which the air is introduced from the lower part and the crushed floor material is charged into the upper part and the iron oxide is recovered downward due to the difference in specific gravity. m < 3 > / min.

The step of separating the iron oxide may include dispersing the pulverized bottom material in water and then pulsing up or down or right and left to collect the iron oxide by the specific gravity difference.

According to the method of recovering iron oxide contained in the bottom of a thermal power plant according to the present invention, iron oxide which is not separated by magnetic force lines can be recovered, thereby enabling to separate and collect iron wire loses more effectively, thereby reducing the amount of landfill, It can be recovered more effectively.

Fig. 1 shows the result of mineral analysis of the thermal power plant floor material.
2 is a process diagram of the iron oxide recovery method included in the bottom of a chemical power plant according to an embodiment of the present invention.
3 is a schematic view of an air separator according to an embodiment of the present invention.
FIG. 4 is a graph illustrating the recovered recovered product and the quality of iron oxide according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, a method for recovering iron oxide contained in the bottom of a thermal power plant according to a preferred embodiment of the present invention will be described.

Thermal power plant flooring contains quartz, mullite, magnetite, hematite, and briquettes. It accounts for about 10 ~ 13% of double iron oxide.

Mineralogical analysis was carried out to identify iron oxides contained in the thermal power plant flooring. Fig. 1 shows the result of mineral analysis of the thermal power plant floor material. Referring to FIG. 1, it can be seen that the major mineral phases are quartz and mullite. In addition, iron oxides such as magnetite and hematite are included.

Table 1 below shows the chemical composition of the thermal power plant flooring material. As a result of analysis, mainly Si, Ca and Al components are contained and Fe component is included, which is the same result as mineral analysis.

Item SiO 2 Al 2 O 3 Fe 2 O 3 CaO MgO K 2 O Na 2 O TiO 2 MnO Content (wt%) 41.39 19.11 12.45 10.10 0.80 0.31 0.25 1.21 0.10

2 is a process diagram of the iron oxide recovery method included in the bottom of a chemical power plant according to an embodiment of the present invention.

The iron oxide recovery method included in the chemical power plant floor material according to an embodiment of the present invention includes a step (S10) of crushing the thermal power plant floor material and a step (S20) of separating the iron oxide material using the difference in specific gravity .

(S10) The flooring contains several minerals, including briquettes, and is quenched by seawater after it is formed. Since various materials are physically adhered to the floor, For the purpose of group separation.

The grinding of the bottom material can be performed by a ball milling method using a steel ball.

It is preferable that the ground material to be ground is ground by a sieve to a diameter of not more than 0.15 mm and then used for the iron oxide separation step. If the diameter of the bottom material exceeds 0.15 mm, the separation of the mineral phases is not performed, and the separation of the iron oxides may not be effectively separated due to the difference in specific gravity.

(S20) Iron oxide hematite and magnetite have specific gravity of 5.26 and 5.18, respectively, quartz of 2.65, and watery light, respectively. (mullite) is 3.11 ~ 3.26, and the specific gravity difference between iron oxide and nonferrous material is about 2, so that it is possible to efficiently separate iron oxide and nonferrous material using the difference in specific gravity.

Separation method using specific gravity difference can be separated by using a fluid such as air or water in a state in which particles can move with each other in order to separate particles having different specific gravity, Do.

For example, in the case of separation by water, the ground bottom material may be dispersed in water and then pulsated upward or downward or right and left to separate the iron oxide by the specific gravity difference.

As another example, in air separation, the mineral particles having different specific gravity are injected into the upper part through the air sorter, and air is injected from the lower part to discharge the lower specific gravity to the upper part and the higher specific gravity to the lower part Materials with different specific gravity can be efficiently separated.

In an embodiment of the present invention, the air is introduced from below and the crushed floor material is charged into the upper part and separated by an air separator in which the iron oxide is recovered downward at a specific gravity difference. The flow rate of the introduced air is 0.1 to 1.0 m 3 / min.

If the flow rate of air that is introduced is less than 0.1m 3 / min, and the flow rate is not low enough to be suspended in the upper non-ferrous metal-containing material is low density can not happen effectively separated, the flow rate of air than 1.0m 3 / min The material containing iron oxide may float up to the upper part and may be difficult to separate. Therefore, the flow rate of air is limited to the above range.

3 is a schematic view of an air separator according to an embodiment of the present invention.

The air separator 100 according to an embodiment of the present invention includes a hopper 10, a blower 20, a lower collecting pipe 30, and an upper collecting pipe 40. The crushed flooring can be charged into the hopper 10 connected to the upper part of the air separator. A blower (20) is connected to the lower part of the air separator to supply air to the inside of the air separator to separate the non-ferrous metal-containing powder (50) floating by air through the upper return pipe (40) The high iron oxide (60) can be discharged through a lower recovery pipe (30) connected to the lower portion of the air separator. Such an air separator is only an example of the present invention and is not limited to this type or method.

FIG. 4 is a graph illustrating the recovered recovered product and the quality of iron oxide according to an embodiment of the present invention. The air flow rate was 0.1 ~ 1.0m 3 / min and the bottom material was separated by air separator for 10 minutes while charging 50g / min.

As the air flow rate increased, the recovery rate of iron oxide increased, but the recovery rate decreased. At an air flow rate of 0.6 m 3 / min, the iron oxide content was 85% and the recovery rate was 83%.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the exemplary embodiments or constructions. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. will be.

It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

10: hopper 20: blower
30: Lower collection pipe 40: Upper collection pipe
50: powder containing nonferrous metal 60: iron oxide powder

Claims (4)

Crushing the thermal power plant flooring; And
Separating the iron oxide from the pulverized bottom material using a difference in specific gravity;
Wherein the iron oxide is recovered from the bottom of the thermal power plant floor. The method of claim 1,
Wherein the pulverizing step comprises pulverizing the bottom of the thermal power plant to a diameter of 0.15 mm or less. 3. The method according to claim 1 or 2,
The step of separating the iron oxide is carried out by separating the iron oxide by the air separator in which the air is introduced from the lower part and the crushed floor material is charged into the upper part and the iron oxide is recovered downward due to the difference in specific gravity,
Wherein the flow rate of the introduced air is 0.1 to 1.0 m < 3 > / min. 3. The method according to claim 1 or 2,
Wherein the step of separating the iron oxide includes dispersing the ground bottom material in water and then pulsing the iron oxide upwards or downwards or right and left to recover the iron oxide by the specific gravity difference.
KR1020120157609A 2012-12-28 2012-12-28 Method for recovery of iron oxide in bottom ash from power plant KR20140087403A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120157609A KR20140087403A (en) 2012-12-28 2012-12-28 Method for recovery of iron oxide in bottom ash from power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120157609A KR20140087403A (en) 2012-12-28 2012-12-28 Method for recovery of iron oxide in bottom ash from power plant

Publications (1)

Publication Number Publication Date
KR20140087403A true KR20140087403A (en) 2014-07-09

Family

ID=51736328

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120157609A KR20140087403A (en) 2012-12-28 2012-12-28 Method for recovery of iron oxide in bottom ash from power plant

Country Status (1)

Country Link
KR (1) KR20140087403A (en)

Similar Documents

Publication Publication Date Title
CA2976261C (en) System and process for dry recovery of iron oxide fines from iron bearing compact and semicompact rocks
JP5923039B2 (en) Soil purification method
CN103962232B (en) A kind of beneficiation method of Rare Earth Mine
US9327292B2 (en) Process and system for dry recovery of fine and superfine grained particles of oxidized iron ore and a magnetic separation unit
CN104624607A (en) Household garbage incineration residue treatment method
CN103041920A (en) Ore dressing method and ore dressing system suitable for lean magnetite ores
CN105921484A (en) Comprehensive utilization method of furnace slag in household garbage incineration power plant
CN110328047B (en) Method for preparing ceramic raw material from granite stone sawn mud stone powder
CN105057089A (en) Beneficiation technology for rock-type primary ilmenite
CN105597907A (en) Chemical-adding scrubbing-magnetic separation beneficiation and enrichment method suitable for clay vanadium ore
CN101537394A (en) Chemical-adding scrubbing beneficiation and enrichment method suitable for clay vanadium ore
CA2963990C (en) Process and system for totally dry ore-dressing through a magnetic separation unit
RU2489214C1 (en) Processing line for treatment of ash-and-slag wastes, that is, coal fuel combustion products
CN105435958B (en) Beneficiation and enrichment method for primary scandium ore
CN100430145C (en) Method for magnetic separating of aluminum and iron in high iron bauxite
CN110582672B (en) Method for operating a fluidized bed boiler
KR20140087403A (en) Method for recovery of iron oxide in bottom ash from power plant
CN108031546A (en) A kind of method of red mud recycling iron
CN1765520B (en) Method for extracting Fe from ion ore tailings
WO2017045041A1 (en) System and method for dry recovery of iron oxide fines from compact iron-bearing rocks
CN111153408A (en) Method for recovering metallic silicon in silicon slag
BR102014012541A2 (en) system and process for dry recovery of iron oxide fines from compact rock iron holders
Dahe SLon magnetic separator applied to upgrading the iron concentrate
KR101053215B1 (en) Efficient Screening Method of Iron Oxide in Thermal Power Plant Floor
Kumar et al. Utilization of some Indian iron ore waste plant tails by reprocessing

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination