JP5775834B2 - Method for producing steel slag hydrated solidified body and apparatus for producing kneaded product of steel slag hydrated solidified prior to solidification - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a hydrated solidified body of steel slag and an apparatus for producing a kneaded product of a hydrated solidified steel slag before solidification , and more specifically, the steel slag water with simplified equipment and stable quality. The present invention relates to a method for producing a hydrated and solidified steel slag capable of smoothly producing a Japanese solidified body and an apparatus for producing a kneaded product of a hydrated and solidified steel slag before solidification .

  Steel slag hydrated solid bodies manufactured using slag produced in the production process of steel are known. The steel slag hydrated solidified body is expected to be used as an unreinforced structure such as a deformed block used for harbor construction, a root consolidation block, and a discarded block. The steel slag hydrated solidified body is produced by adding blast furnace slag fine powder to steelmaking slag, kneading with water and solidifying. If necessary, blast furnace granulated slag, fly ash, and alkali stimulating material are added and blended. Thus, steel slag hydrated solidified body is an excellent recycling material that can recycle materials that are no longer needed, and thus is also attracting attention from the viewpoint of environmental protection.

By the way, it is said that the kneaded product of the steel slag hydrated solid before solidification can be produced using equipment equivalent to the ready- mixed concrete production equipment. However, the kneaded mixture of steel slag hydrated solids has a relatively high unit amount of blast furnace slag fine powder and a smaller unit amount of water than that of ready-mixed concrete, and thus has a high viscosity and a high specific gravity. Therefore, there is a problem that the load on the kneader to be kneaded becomes excessive. In addition, when blending fly ash or alkali stimulating material (cement), the amount of these units is small compared to the blast furnace slag fine powder, so it is difficult to uniformly disperse and knead and the quality tends to vary. .

Although it does not mix blast furnace slag fine powder, a method for producing mortar produced by recycling soil such as excavated soil has been proposed (for example, see Patent Documents 1 and 2). In the method described in Patent Document 1, cement milk is stirred to produce cement milk, and the cement milk and mud (excavated soil) are kneaded by a batch-type forced biaxial mixer to produce mud mortar (paragraph 0011). 0012, 0031-0033, etc.). In such a batch type forced biaxial mixer, it is difficult to knead the kneaded product of the hydrated and solidified steel slag having a high viscosity and a large specific gravity. Further, since the kneaded material has a high viscosity, it is difficult to take out from the batch type forced biaxial mixer.

  In the method described in Patent Document 2, construction-generated soil (excavated soil) and quicklime are mixed to generate lime-improved soil, and water and hydraulic solidified material are mixed to generate a hydraulic solidified slurry. Lime improved soil and hydraulic solidifying material slurry are mixed to produce lime improved soil mortar (see paragraph 0017 etc.). This method has a problem that the kneading process has three stages, and the equipment becomes large and complicated.

JP-A-8-57839 Japanese Patent Laid-Open No. 2001-19956

An object of the present invention is to simplify a facility, and to smoothly produce a slag hydrated solidified body with stable quality, and a method for producing a hydrated solidified body of steel slag and hydrated solidified steel slag before solidification It is providing the manufacturing apparatus of the kneaded material of a body .

In order to achieve the above object, the method for producing a hydrated solidified body of steel slag according to the present invention produces a slurry by mixing at least one of an alkali stimulating material and fly ash with water, and this slurry, steelmaking slag and blast furnace slag. By supplying the fine powder to the continuous mixer and conveying the supplied material to the discharge port while kneading in the continuous mixer, the kneaded product of the steel slag hydrated solidified before solidification is continuously obtained. It is characterized by solidifying after discharging from the discharge port during production.

An apparatus for producing a kneaded mixture of steel slag hydrated solidified before solidification according to the present invention includes a mixer for mixing at least one of an alkali stimulating material and fly ash and water to produce a slurry, and the slurry and steelmaking. Steel slag before the slag and blast furnace slag fine powder are fed separately to each other, and the supplied material is kneaded in the continuous mixer and transported to the discharge port to be solidified The hydrated and solidified kneaded material is continuously produced and discharged from the discharge port.

According to the present invention, at least one of the alkali stimulating material and fly ash is mixed with water, and the material with a small unit amount is made into a slurry in advance, so that the material with a small unit amount is uniformly distributed in the continuous mixer. It becomes easy to disperse. Accordingly, it becomes easy to obtain a stable slag hydrated steel slag. In addition, the material with high viscosity is kneaded with a continuous mixer and transported through the mixer, and the kneaded product of steel slag hydrated solidified body is continuously produced and discharged from the discharge port. Compared with the case where the mixture is fed to the batch mixer and kneaded, the slag hydrated and solidified kneaded material can be obtained smoothly while reducing the load on the kneader . In addition, since only one facility for mixing and kneading is sufficient, the facility can be simplified.

Here, for example, the slump value of the steel slag hydrated solidified material discharged from the discharge port is measured, and the amount of the slump measured value is compared with the preset target value. Is adjusted so that the slump value of the kneaded product of the hydrated solidified steel slag discharged after that becomes the target value. Thereby, it is possible to obtain a hydrated solidified body of steel slag having a stable quality while using a steelmaking slag that has variations in moisture content and the like and whose properties are not stable.

In order to obtain a high strength steel slag hydrated solid body, the unit amount of the blast furnace slag fine powder in the material supplied to the continuous mixer is made larger than the unit amount of water. For example, the unit amount of the blast furnace slag fine powder is set to 300 kg / m ³ or more and 400 kg / m ³ or less.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole schematic diagram of the manufacturing apparatus of the kneaded material of the steel slag hydrated solidified body before solidification of this invention. It is explanatory drawing which illustrates the manufacturing apparatus of FIG. 1 in the state which is supplying water to a continuous mixer.

  Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

The apparatus for producing a kneaded product of steel slag hydrated solidified before solidification of the present invention illustrated in FIG. 1 (hereinafter referred to as production apparatus) includes a continuous mixer 1 and a mixer 3. The mixer 3 includes a batch mixer and an agitator.

  A cement silo 5 equipped with a meter 5a and a fly ash silo 6 equipped with a meter 6a are installed on the top of the mixer 3. In addition, a water supply pump 7 installed in a water tank 9 is connected to the mixer 3 via a pipe.

  A preset amount of alkali stimulating material A and fly ash F are supplied to the mixer 3 from the cement silo 5 and the fly ash silo 6 through the respective metering devices 5a and 6a. A predetermined amount of water W is supplied from the water tank 9. In the batch mixer of the mixer 3, the supplied materials A and F and water W are mixed to generate a slurry, and in order to prevent precipitation of the mixed materials A and F, the agitator continuously Agitation is performed.

  The continuous mixer 1 is a uniaxial mixer having an inlet 1a at one end and an outlet 1b at the other end and one spiral kneading blade juxtaposed inside the housing. A pipe extending from the mixer 3 is disposed at the input port 1a. Through this pipe, the slurry generated by the mixer 3 is continuously supplied to the continuous mixer 1.

  Furthermore, a steelmaking slag supply machine 2 and a blast furnace slag fine powder supply machine 4 are installed, and a preset amount of steelmaking slag S is continuously supplied from the steelmaking slag supply machine 2 to the charging port 1a. A predetermined amount of blast furnace slag fine powder SP is continuously supplied from the supply device 4 to the charging port 1a.

  In addition, an adjustment water supply pump 8 installed in the water tank 9 is connected to the input port 1a through a pipe. This pipe is provided with a water amount adjusting portion 8a. The water amount adjusting unit 8a is, for example, a control valve or a flow meter.

  With the above structure, slurry, steelmaking slag S, and blast furnace slag fine powder SP are continuously supplied to the continuous mixer 1 by separate systems. The continuous mixer 1 is supplied with water W from the adjustment water supply pump 8 as necessary.

  The steelmaking slag S is slag generated in the steelmaking process of steel production, releases Ca, functions as a stimulating material for the blast furnace slag fine powder SP, and also functions as an aggregate. Moreover, it becomes a Ca supply source of the pozzolanic reaction of fly ash.

  The blast furnace slag fine powder SP is a vitreous fine powder obtained by rapidly cooling and pulverizing slag produced in the iron making process of steel production with water, followed by drying and pulverization. And it functions as a binder by promoting the hydration reaction in the presence of the alkali stimulating material A.

Fly ash F is fine ash generated in a pulverized coal combustion boiler, is cured by causing a pozzolanic reaction with Ca (OH) _2, and functions as a binder.

The alkali stimulating material A assists the curing reaction of the blast furnace slag fine powder and promotes the pozzolanic reaction of fly ash F. Examples of the alkali stimulating material A include cement, Ca (OH) ₂ , and CaO.

  Hereinafter, the manufacturing method of the steel slag hydrate solidification body of this invention is demonstrated.

  In the mixer 3, a predetermined amount of alkali stimulating material A, fly ash F, and water W are mixed to generate a slurry. In this embodiment, the cement silo 5 and the fly ash silo 6 are installed, but at least one may be provided. In the mixer 3, at least one of the alkali stimulating material A and the fly ash F and the water W are mixed to generate a slurry.

  Next, predetermined amounts of slurry, steelmaking slag S, and blast furnace slag fine powder SP are supplied to the continuous mixer 1.

In the continuous mixer 1, these supplied materials are kneaded and conveyed from the inlet 1a side toward the outlet 1b. In the process of being transported to the vicinity of the discharge port 1b, the supplied material becomes a kneaded product C of the hydrated solidified steel slag before it is sufficiently kneaded and solidified . Thus, in the continuous mixer 1, the kneaded material C of the slag hydrated solidified body is continuously produced and discharged from the outlet 1b. At this time, the viscosity of the slag hydrated solidified product C is 5 cm or more, preferably 7 cm or more in terms of a slump value (measured value based on a test defined in JIS A 1101).

Formulation of each material supplied to the continuous mixer 1, as the unit amount of the kneaded material C1m per ³ steel slag hydrated solid material, for example, as follows.

Steel slag S: 1500 to 2000 kg / m ³
Blast furnace slag fine powder SP: 250 to 450 kg / m ³
Water W: 150-300 kg / m ³
Fly ash F: 100-200 kg / m ³
Alkali stimulant A: 20-50 kg / m ³
In order to obtain a high strength steel slag hydrated solid body , the unit amount of the blast furnace slag fine powder SP in the material supplied to the continuous mixer 1 is made larger than the unit amount of water W. For example, the unit amount of the blast furnace slag fine powder SP may be 300 kg / m ³ or more and 400 kg / m ³ or less.

The kneaded product C of the steel slag hydrated solidified body is hardened, and the mechanism for producing the steel slag hydrated solidified body is included in the steelmaking slag S when the slurry, the steelmaking slag S and the blast furnace slag fine powder SP are mixed. Ca ²⁺ is eluted, and a hydrated gel is formed and hardened by a hydration reaction with elements such as Si and Al in the amorphous phase contained in blast furnace slag fine powder SP and fly ash F. by. The hydration reaction can be promoted by adding the alkali stimulating material A.

When the kneaded product C of the slag hydrated and solidified product is produced, if all materials are kneaded from the beginning, the unit amount of water W is small and the viscosity becomes high. It becomes difficult to transfer the product to the outside of the kneader. Further, since the blending amount of the alkali stimulating material A and fly ash F is relatively small, it cannot be uniformly dispersed.

In the present invention, the alkali stimulating material A and fly ash F having a small unit amount are mixed with water W in the mixer 3 and made into a slurry in advance so that they are uniformly dispersed in all materials in the continuous mixer 1. It is easy to make it. Accordingly, it has been advantageously to obtain a stable steel slag hydrated solid material quality.

Further, the kneaded material C of the steel slag hydrated solid material becomes a high viscosity, and is conveyed through the mixer while kneading in a continuous mixer 1 continuously produce a kneaded product C of steel slag hydrated solidified However, since the material is discharged from the discharge port 1b, the steel slag hydrated solidified kneaded material C can be obtained smoothly while reducing the load on the continuous mixer 1, as compared with the case where all the materials are supplied from the beginning and kneaded. be able to. In addition, since only one facility for mixing and kneading is sufficient, the facility can be simplified.

The kneaded product C of the hydrated and solidified steel slag discharged from the discharge port 1b is conveyed to a predetermined position by the belt conveyor 10, for example. Then, the kneaded product C of the steel slag hydrated solidified body is transported to a curing yard, spread to an appropriate thickness, and cured and dried. The density of the steel slag hydrated solid product obtained by drying the steel slag hydrated solid mixture C is about 1800 to 2700 kg / m ³ , and the uniaxial compressive strength (measured value based on the test specified in JIS A 1108) is 9. .About.8-35.0 N / mm ² .

Steel slag hydrated solidified drying the kneaded material C of the steel slag hydrated solid material to the desired size crushed by crusher or the like. The crushed steel slag hydrated solidified body is used as, for example, a deformed block, a root consolidation block, a discarding block, or the like used for harbor construction.

Incidentally, the steelmaking slag S is a by-product generated in the steelmaking process of steel production. In addition, when stocked, the moisture content changes due to the influence of rainfall, etc., resulting in variations, so the properties are not stable .
Therefore, as shown in FIG. 2, for example, the slump value of the kneaded product C of the steel slag hydrated solid body discharged from the discharge port 1 b is measured, and based on a comparison between the measured slump value and a preset target value. Then, water W is supplied to the continuous mixer 1 by adjusting the amount. And it is good to make the slump value of the kneaded material C of the steel slag hydrated solid body discharged thereafter become a target value (approach).

Specifically, first, the amount of water W supplied from the water supply pump 7 to the mixer 3 is reduced in advance. That is, the moisture content in the slurry supplied from the mixer 3 to the continuous mixer 1 is slightly reduced, and the slump measurement value of the kneaded material C of the hydrated solidified steel slag discharged from the discharge port 1b is below the target value. Keep it. And the slump measured value (measured value based on the test prescribed | regulated to JIS A1101) of the kneaded material C of the steel slag hydrated solid body discharged | emitted from the discharge port 1b is compared with the preset target value.

  When the slump measurement value is the target value (allowable range), the adjustment water W is not supplied to the continuous mixer 1. On the other hand, when the slump measurement value is smaller than the target value (allowable range), the adjustment water supply pump 8 is operated so as to reach the target value, and the necessary amount of adjustment water W is supplied to the continuous mixer 1. . For example, the amount of water W supplied to the continuous mixer 1 is controlled (operated) using the water amount adjusting unit 8a. This control can be performed manually by an operator or by automatic control by a control device.

Thereby, from the time of supplying the adjustment water W to the continuous mixer 1, the unit amount of the water W is optimized, and a target slag hydrated solidified steel slag can be obtained. Therefore, while using a steel slag S which property is not stable, easily obtain a stable steel slag hydrated solid material quality.

DESCRIPTION OF SYMBOLS 1 Continuous mixer 1a Input port 1b Discharge port 2 Steelmaking slag supply machine 3 Mixer 4 Blast furnace slag fine powder supply machine 5 Cement silo 5a Metering meter 6 Fly ash silo 6a Metering meter 7 Water supply pump 8 Adjustment water supply pump 8a Water amount adjustment (Control valve, flow meter)
9 Water tank 10 Belt conveyor A Alkaline stimulant F Fly ash
C Mixture of steel slag hydrated solid before solidification S Steel slag SW Blast furnace slag fine powder W Water

Claims (8)

At least one of the alkali stimulating material and fly ash and water are mixed to produce a slurry, and this slurry, steelmaking slag and blast furnace slag fine powder are supplied to a continuous mixer, and these supplied materials are supplied to the continuous mixer. Steel slag water characterized in that it is solidified after being discharged from the discharge port while continuously producing a kneaded product of the hydrated solidified steel slag before being solidified by being conveyed to the discharge port while kneading in A method for producing a solidified product. Measure the slump value of the steel slag hydrate solidified kneaded product discharged from the discharge port before solidification, and add the amount to the continuous mixer based on the comparison between the slump measurement value and the preset target value. The steel slag hydrated solidified product according to claim 1, wherein water is supplied after adjustment and the slump value of the kneaded mixture of the steel slag hydrated solidified before being discharged becomes a target value. Production method.   The method for producing a hydrated and solidified steel slag according to claim 1 or 2, wherein the unit amount of blast furnace slag fine powder in the material supplied to the continuous mixer is larger than the unit amount of water. The method for producing a hydrated solidified steel slag according to claim 3, wherein the unit amount of the blast furnace slag fine powder is 300 kg / m ³ or more and 400 kg / m ³ or less. A mixer that mixes at least one of an alkali stimulating material and fly ash and water to generate slurry, and a continuous mixer in which the slurry, the steelmaking slag, and the blast furnace slag fine powder are supplied separately from each other. The supplied material is conveyed to the discharge port while being kneaded in the continuous mixer, and the kneaded product of the hydrated solidified steel slag before solidification is continuously produced and discharged from the discharge port. An apparatus for producing a kneaded product of a hydrated solidified body of steel slag before solidification , characterized in that it is made into a solid . So that the target value slump measured value preset of the kneaded material of steel slag hydrated solidified body before solidifying discharged from said discharge port, adjust for supplying water to adjust the amount of the continuous mixer The manufacturing apparatus of the kneaded material of the steel slag hydrated solidified body before solidification according to claim 5 provided with a water supply pump. The slag hydrated solidified body before solidification according to claim 5 or 6, wherein the unit amount of blast furnace slag fine powder in the material supplied to the continuous mixer is set to be larger than the unit amount of water . Kneaded product manufacturing equipment. The apparatus for producing a kneaded product of steel slag hydrated solidified before solidification according to claim 7, wherein the unit amount of the blast furnace slag fine powder is set to 300 kg / m ³ or more and 400 kg / m ³ or less.

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