WO2001048250A1

WO2001048250A1 - Method for utilizing activated carbon powder recovered from exhaust sintering gas treating apparatus

Info

Publication number: WO2001048250A1
Application number: PCT/JP2000/009375
Authority: WO
Inventors: Hiroshi Kurokawa; Hidenobu Kusunoki; Masahiko Hamada; Akifumi Umedu
Original assignee: Nippon Steel Corporation
Priority date: 1999-12-28
Filing date: 2000-12-28
Publication date: 2001-07-05
Also published as: KR100623345B1; AU2404401A; JP2001181746A; AU777336B2; KR20010102419A

Abstract

A method for utilizing an activated carbon powder recovered from an exhaust sintering gas treating apparatus, characterized in that the activated carbon powder is reused in an iron making process. Specifically, the activated carbon powder is molded together with collected dust, sludge and crushed ores by using a binder into cold pellets, which are reused as a raw material in a blast furnace; the powder is added to quasi-granulated dust, and the resulting mixture is reused as a sintering fuel in a sintering machine; or the powder is blown into a tuyere of a blast furnace to thereby reuse it as a fuel and a reducing agent in a blast furnace. The method can be employed for recycling and using effectively an activated carbon powder recovered from a exaust sintering gas treating apparatus, which has conventionally been disposed of as a waste.

Description

o 5

How to use activated carbon powder recovered from sintering flue gas treatment equipment

Technical field

The present invention relates to a method of using activated carbon powder collected from a sintering flue gas treatment facility for recycling and effectively using activated carbon powder collected from a sintering flue gas treatment facility that has been conventionally disposed of. Akita

0 Background technology

Conventionally, an exhaust gas treatment device for desulfurizing exhaust gas generated from a sintering machine has been used in a steelmaking plant. As this exhaust gas treatment device, for example, Japanese Patent Application Laid-Open No. 5-200272 is disclosed.乾 As disclosed in Japanese Patent Application Laid-Open No. 10-128687, a dry type using activated carbon is known.

However, a large amount of activated carbon powder was generated from the exhaust gas treatment equipment in the process of moving and transporting the activated carbon, and this activated carbon powder had no choice but to be treated as waste at this time. Therefore, from the viewpoint of resource saving and garbage reduction, there has been a demand for the development of a new method for recycling and effectively using the activated carbon powder.

0 The present invention solves the conventional problems as described above, and enables a sintering flue gas treatment facility capable of recycling activated carbon powder collected from a conventionally disposed sintering flue gas treatment facility for effective use. It was completed with the aim of providing a method of using activated carbon powder recovered from Japan.

Disclosure of the invention

The method of using the activated carbon powder recovered from the sintering exhaust gas treatment equipment of the present invention, which has been made to solve the above-mentioned problem, is to reuse the activated carbon powder recovered from the sintering exhaust gas treatment equipment in the iron making process. It is characterized by the following. As a specific method of recycling, activated carbon powder is hardened with a binder together with dust collected dust, sludge, and ore crushed material into a cold pellet, and is reused as a blast furnace raw material. Invention. The invention of claim 3 wherein activated carbon powder is added to the pseudo-granulated dust and reused as a sintering fuel in a sintering machine is claimed in claim 3.Furthermore, the activated carbon powder is blown into a blast furnace tuyere to reduce blast furnace fuel and / or reduction. What is reused as an agent is the invention of claim 4. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic diagram showing a treatment device for sintering exhaust gas.

FIG. 2 is a graph showing the relationship between the blending ratio of the carbon-containing components in the cold pellets and the pressure loss.

FIG. 3 is a schematic diagram showing a pellet manufacturing apparatus.

FIG. 4 is a graph showing the relationship between the raw material mixing ratio of activated carbon powder and the production rate.

Explanation of reference numerals

1: activated carbon adsorption tower. 2: Activated carbon regeneration tower. 3: Activated carbon transfer conveyor. 5: Activated carbon powder hopper. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the specific examples shown below.

Figure 1 shows a basic sintering flue gas treatment system, where 1 is an activated carbon adsorption tower, 2 is an activated carbon regeneration tower, 3 is an activated carbon transfer conveyor, 4 is a sieve, and 5 is an activated carbon powder hopper. , 6 is the chimney. In the present invention, the activated carbon powder recovered in the activated carbon powder hopper 5 has been conventionally disposed of, but has a characteristic configuration in that the activated carbon powder is recycled and reused in the iron making process for effective use.

In other words, the present inventors focused on the fact that coke powder was used in the iron making process, and based on the insight that activated carbon powder similar in properties to this could be used if some measures were taken. Of various researches, it can be reused without disposal We established a way to do this.

As a specific method of recycling, activated carbon powder can be collected together with dust dust, sludge, ores (iron-containing ore) and crushed material with a binder to form cold pellets and reused as raw material .

The cold pellets are introduced into the blast furnace as a raw material for the blast furnace, and especially, the carbon-containing cold pellets containing coke powder can be uniformly reduced, including the inside, to improve the reducibility. . And in this invention, it succeeded in using activated carbon powder instead of the said coke powder. However, if the amount of coal is too large, the reducibility will be too good (it will melt at low temperature), which will deteriorate the permeability in the furnace. Also, consider that activated carbon powder has a larger surface area than coke powder. There is a need. The present inventors conducted a high-temperature property test using a BIS furnace by flowing a gas of CO: N ₂ = 30: 70 with respect to the blended amount of activated carbon powder. Specifically, the sample was heated in a heating pattern that simulated the inside of a blast furnace, and the change in pressure loss value due to the melting characteristics was measured, as shown in Fig. 2. It turned out that the volume ratio is 15% or less, preferably 10% or less. The obtained cold pellets had sufficient strength by using cement as a binder, and were excellent in handleability.

An example of cold pellets is as follows: blast furnace dust collected by mass is 30.0%, sintered dust collected dust is 12.5%, activated carbon powder is 4.3%, ores (ore containing iron). A mixture of 42.9% of crushed material and 6.5% of binder cement was prepared and put into a blast furnace for use. As a result, it was confirmed that the operation could be stably continued without inferiority to the cold pellets (constituted by replacing the above-mentioned activated carbon powder with coke powder) mixed with conventional coke powder.

The cold pellet as described above stores activated carbon powder extracted by a jet pack vehicle from the activated carbon powder hopper 5 of the sintering exhaust gas treatment device in a raw material tank of a pellet manufacturing device as shown in FIG. It is made into pellets of a prescribed blending amount by solidifying it with a binder together with dust collected, sludge, and ore crushed material (eg, fine ore). Further, pellets including iron sand may be solidified with a binder to form pellets. And The obtained cold pellets can be used as blast furnace raw materials in the blast furnace in the iron making process.

As another specific method of reuse, activated carbon powder can be added to pseudo-granulated dust and reused as a sintering fuel in a sintering machine. Here, quasi-granulated dust is one that has been conventionally produced in a cold pellet production plant, and ore, dust, etc. are granulated without adding cement.

Since activated carbon powder has a fine average particle size of about 0.2 mm, simply using it as a fuel for sintering reduces the porosity of the packed bed of sintering raw materials, impedes airflow, and leads to deterioration of productivity. However, there is a problem that the combustion speed is high, the amount of heat transferred to the ore is small, and the sinter strength is reduced.

Therefore, the present inventors have focused on the amount of activated carbon powder (mass ratio) and studied. Specifically, an operation experiment was conducted by replacing the activated carbon powder with coke powder by 0.055% in a range of 0.05 to 0.2% in a blending raw material ratio. As a result, as shown in FIG. 4, it was found that when the content was more than 0.1%, the productivity was remarkably deteriorated. Therefore, the blending amount of the activated carbon powder was preferably 0.1% or less in the blending material ratio. However, it was confirmed that they could be used under these conditions without affecting the sintering operation. In addition, when activated carbon powder is granulated by mixing it with the raw material of pseudo-granulated dust and used, when it is used as the above-mentioned direct sintering fuel, it can be used only up to 0.1% by sintering bonding raw material ratio In contrast, it was confirmed that the amount of activated carbon powder contained in the quasi-granulated dust could be used without affecting the sintering operation up to the equivalent of 1.0% in the sintering compounding raw material ratio.

As another specific method of reuse, activated carbon powder can be blown into the tuyere of the blast furnace and reused as fuel and / or reducing agent.

In this case, activated carbon powder is harder than pulverized coal, and if the pulverized coal blowing equipment is used as it is, problems such as pipe abrasion occur. Therefore, anti-wear measures must be taken before use. Activated carbon powder has a larger particle size than pulverized coal after crushing, and the burning rate in the blast furnace slows down. Therefore, in the present invention, it was confirmed that the operation could be performed without any change in the furnace condition if the blowing amount was up to 40 Kg / T. Industrial applicability

As is clear from the above description, the present invention is capable of recycling the activated carbon powder collected from the sintering waste gas treatment facility that has been conventionally disposed of, thereby achieving effective utilization.

Therefore, the present invention greatly contributes to industrial development as a method of using activated carbon powder recovered from a sintering exhaust gas treatment facility that has eliminated the conventional problems.

Claims

The scope of the claims

1. A method of using activated carbon powder recovered from a sintering exhaust gas treatment facility, wherein the activated carbon powder recovered from the sintering exhaust gas treatment facility is reused in the iron making process.

2. The activated carbon powder collected from the sintering exhaust gas treatment facility according to claim 1, wherein the activated carbon powder is solidified with a binder together with dust collection dust, sludge, and ore crushed materials to form a cold pellet and reused as a blast furnace raw material. How to Use.

3. The method of claim 1, wherein the activated carbon powder is added to the quasi-granulated dust and reused as a sintering fuel in a sintering machine.

4. The method of claim 1, wherein the activated carbon powder is blown into a tuyere of a blast furnace and reused as a blast furnace fuel and / or a reducing agent.