JP2019181354A - Granulation-solidification processing of powder material - Google Patents

Abstract

To provide a granulation object manufacturing method for preventing fastening of mutual granulation objects, by delaying progress of hardening reaction of the granulation objects to an optional time.SOLUTION: A method for granulation-solidification-processing a powder material having a self-hardening property such as combustion ash and steel making dust, is composed of a process 1 of mixing-granulating a granulation object by adding an organic compound such as a soluble sugar or a carboxylic acid to the powder material and a process 2 of adding the physical action to the granulation object after the process 1, and progress of hardening reaction of the granulation object is delayed to an optional time by the process 1, and fastening of the mutual granulation objects is further prevented by the process 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for granulating and solidifying a powder material in which the progress of the curing reaction of a granulated product is delayed to an arbitrary time and the granulated product is prevented from being integrated by suppressing the fixation of the granulated products.

As a method to recycle powder materials such as combustion ash and steelmaking dust that are easily scattered, it is manufactured by mixing moderate water, chemicals that suppress the elution of harmful substances such as heavy metals, and a small amount of solidified material such as quick lime or cement. There is a method of solidifying.
In such a granulation solidification treatment, the powder material can be made into a shape that does not pose a problem for handling, and the combustion ash is an excellent material for backfilling, fertilizer, snow melting agent, or soil improvement. It becomes a material, and the steelmaking dust becomes a lump material for recovering the contained metal component.
In general, in the granulation solidification process, since the workability in the usage scene becomes important, the manufactured granulated product is required to have a certain degree of fluidity such as gravel and sand. On the other hand, there is also an action of a solidifying material such as quick lime or cement added for the purpose of maintaining the shape of the granulated product, and the granulated product deposited during curing may be fixed and integrated. Therefore, in actual operation sites, taking into account that the initial strength development in cement etc. is about 24 hours after water contact, on the next day of production when the granulated product becomes a certain degree of hardness, horizontal movement is also possible. At the same time, physical action is applied using a heavy machine such as a wheel loader, and the granule deposits are broken once to prevent the granulates from sticking to each other so that the deposits are not integrated.

JP2012-076009A JP-A-2006-175030

In general, powders such as combustion ash and steelmaking dust are exposed to high-temperature lime, anhydrous gypsum, oxalic acid, alumina, and metal oxides because they are exposed to lime for the purpose of desulfurization during the generation process, and also exposed to high temperatures. In many cases, components such as products are produced and contained.
A part of these components may be dissolved by contact with water, and a solidified body may be formed in the process of recrystallization. This reaction is more rapid than the hardening reaction of cement and occurs within a few hours with heat generation immediately after granulation. For this reason, in the conventional method in which the process of breaking the deposit using a heavy machine such as a wheel loader is performed on the next day of production, the progress of the curing reaction is too fast so that the granulated material is completely deposited in the deposited state before the heavy machine work is performed. There existed a subject that it integrated and could not manufacture the granulated material with good fluidity and handling.
Also, some materials for backfilling, fertilizer, snow melting agent, or soil improvement need to gradually disintegrate and become familiar in the soil after application. However, in the conventional granulation solidification process, the curing reaction of the powder material itself cannot be controlled, so it was not possible to produce a granulated product with hardness according to the application. .

  Accordingly, an object of the present invention is to provide a method for producing a granulated product that delays the progress of the curing reaction of the granulated product to an arbitrary time and prevents the granulated products from sticking to each other.

Specifically, the above issues are
In the method of granulating and solidifying a powder material having self-hardening properties such as combustion ash and steelmaking dust,
Step 1 of mixing and granulating a granulated product by adding an organic compound such as a soluble sugar or carboxylic acid to the powder material;
After the step 1, comprising a step 2 of applying a physical action to the granulated product,
By the step 1, the progress of the curing reaction of the granulated product is delayed to an arbitrary time,
The problem can be solved by providing a method for granulating and solidifying the powder material, wherein the step 2 further prevents the agglomerates from being fixed to each other.

Moreover, in the method of granulating and solidifying a powder material having self-hardening properties such as combustion ash and steelmaking dust,
Step 3 of granulating the powder material into a granulated product,
A step 4 of attaching an organic compound such as a soluble sugar and a carboxylic acid to the surface of the granulated product granulated by the step 3;
After the step 4, the step 5 of applying a physical action to the granulated product,
By the step 4, the progress of the curing reaction on the surface of the granulated product is delayed to an arbitrary time,
In the step 5, the problem can also be solved by providing a method for granulating and solidifying the powder material, which is characterized by preventing adhesion between the granules.

  ADVANTAGE OF THE INVENTION According to this invention, while progressing the hardening reaction of a granulated material can be delayed to arbitrary time, the granulated material manufacturing method which prevents adhesion | attachment of granulated materials can be provided.

It is the figure which showed the time-dependent change of the heat_generation | fever accompanying the hardening reaction at the time of using the setting retarder for cement for the additive of this invention. It is the figure which showed the time-dependent change of the crushing strength of this invention. It is the figure which showed the time-dependent change of the heat_generation | fever accompanying a hardening reaction at the time of using waste molasses for the additive of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings and tables. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use.

<Powder material>
The powder material used in the present invention is discharged from combustion ash discharged from a waste incineration facility, combustion ash discharged from a power generation facility fueled with biomass or coal, etc., from a converter or electric furnace of a steel mill. Steelmaking dust, etc., which contain any two or more of components such as quicklime, anhydrous gypsum, succinic acid, alumina, metal oxides.

<Organic compounds>
The organic compound used in the present invention is preferably a substance that is recognized to have an effect of delaying the setting of cement. For example, examples of the soluble sugar include sugars such as glucose, fructose, sucrose, and maltose. These soluble sugars may be contained alone or as a mixture of two or more.
Moreover, the thing in which these soluble sugars are contained in a component, such as waste molasses discharged | emitted in a refined sugar process, may be used.

<Carboxylic acid organic compound>
Examples of the carboxylic acid-based organic compound used in the present invention include gluconic acid, ascorbic acid, citric acid and the like. These carboxylic acids may be contained alone or as a mixture of two or more kinds. .
Moreover, the chemical | medical agent containing gluconic acid marketed as a setting retarder of cement can also be used. Furthermore, it is also possible to use these carboxylic acid organic compounds in combination with a soluble sugar.

<Granulation hardening method>
In the granulation solidification method of the present invention, the granulated product is required to gradually disintegrate in the soil after application, such as a material for backfilling, a fertilizer, a snow melting agent, or a material for soil improvement. Can reduce the hardness (crushing strength) of the granulated product after a certain time by adjusting the amount of soluble sugar or carboxylic acid organic compound added to the powder material.

  Examples of the granulation solidification method of the present invention include rolling granulation using a drum-type or pan-type granulator, and high-speed stirring granulation for granulating while stirring with a rotary blade. A method by high-speed stirring granulation that enables granulation while mixing is preferred.

  As a means for adding an organic compound such as a soluble sugar or carboxylic acid so as to adhere to the surface of the granulated product once it has been made into a granulated product, water may be sprayed or sprayed in the granulator. You may spray or spray in the process of transferring from a machine to another process. For example, water can be sprayed or sprayed during the transfer process using a rotating drum inclined toward the discharge port. In addition, water or spraying can be easily performed by appropriately diluting an organic compound such as a soluble sugar or carboxylic acid with water.

  In the implementation, using a small granulation tester etc., add water only to the powder material in advance to produce a granulated product, and confirm that a peak of heat generation is observed within approximately 24 hours immediately after water contact. It is preferable to keep it.

  At this time, if no exothermic peak is observed within 24 hours, or a peak is observed after 24 hours, granulation can be performed without adding the soluble sugar or carboxylic organic compound shown in the present invention. This is because the granulated deposits can be sufficiently destroyed by heavy machinery or the like on the day after the solidification treatment.

  Furthermore, by conducting a granulation test using a small grain tester, etc., and confirming in advance the relationship between the amount of soluble sugar or carboxylic acid added and the peak delay time, The process of granulation solidification processing according to the scheduled time of the breakage work can be assembled.

In the present invention, a physical action is applied to the accumulated granulated material before being completely cured, and this is intended to separate the contact portion between the granulated materials before the granulated materials are completely fixed to each other. Become.
Therefore, as a method of applying a physical action to the accumulated granulated material, in addition to a heavy machine such as a wheel loader, a physical plate installed in the accumulation yard, a diaphragm capable of applying vibration, an operating floor, a turning device, etc. Can be used.

Example 1
Table 1 is a table showing the addition amount and ratio of combustion ash, water, and a set retarder for cement for the test. FIG. 1 is a diagram showing the change over time in the heat generation associated with the curing reaction when a cement retarder is used as the additive of the present invention, and FIG. 2 shows the change over time in the crushing strength of the present invention. It is a figure.
As Experimental Example 1-3, a granulated product was produced by adding a cement retarder (manufactured by GCP Chemicals, trade name: Recover) mainly composed of gluconic acid to combustion ash in the formulation shown in Table 1.
Next, a temperature measurement sensor was inserted into the obtained granulated product, and the change over time in heat generation accompanying the curing reaction was confirmed.
Further, as Comparative Example 1, a granulated product was produced in the same manner except that the cement setting retarder was not added, and the change over time in heat generation due to the curing reaction was confirmed.

As a result, as shown in FIG. 1, it can be seen that the exothermic peak of the granulated product is delayed according to the amount of the cement setting retarder added. That is, it can be seen that the curing reaction is delayed.
Moreover, as shown in FIG. 2, as a result of measuring the crushing strength of the granulated product during curing at regular intervals, the setting delay for cement was compared with Comparative Example 1 and Experimental Example 1 in which the setting amount of the setting retarder was small. It can be seen that in Experimental Examples 2 and 3 in which the amount of the agent added is large, the expression of the crushing strength is delayed as the addition ratio increases.

(Example 2)
Table 2 is a table showing the amount and ratio of combustion ash, water, and molasses for the test. FIG. 3 is a graph showing the change over time in the heat generated by the curing reaction when molasses is used as the additive in FIG.
As Experimental Example 4-5, a high-speed agitation type granulation mixer (trade name: Pelegaia VZ-100, manufactured by Kitagawa Iron Works Co., Ltd.) is used, and waste containing sucrose as a main component in combustion ash with the composition shown in Table 2 Molasses (manufactured by Nippon Sugar Sugar Co., Ltd.) was added to produce a granulated product.
Next, a temperature measurement sensor was inserted into the obtained granulated product, and the change over time in heat generation accompanying the curing reaction was confirmed.
Further, as Comparative Example 2, a granulated product was produced in the same manner except that the molasses was not added, and the change over time in heat generation due to the curing reaction was confirmed.

As a result, as shown in FIG. 3, it can be seen that the exothermic peak of the granulated product is delayed according to the amount of molasses added. That is, it can be seen that the curing reaction is delayed.
Actually, the granulated product of Comparative Example 2 during curing after the elapse of 5.5 hours after the granulation treatment was integrated and the tip of the shovel did not penetrate, but the granulated product of Experimental Example 5 penetrated the tip of the shovel. And it was able to break into a good handling condition.

(Example 3)
Table 3 shows the granulation composition, water for diluting the retarder, and setting retarder for surface adhesion for the test, and Table 4 shows the granulated product that passed through the 9.5 mm sieve for the test. It is the table | surface which showed the ratio, respectively.
As Experimental Example 6, a granulated product having a particle size of about 3 mm to 10 mm was prepared with the granulation composition shown in Table 3, and then as Experimental Example 6, diluted with 1% of the amount of water required for granulation A setting retarder (manufactured by GCP Chemicals, trade name: Recover) was sprayed on the surface of the granulated product. This was filled in a φ100 mm cylindrical container and cured for 24 hours, then demolded, dropped from a height of 1 m, and sieved with a 9.5 mm sieve, and the ratio of the mass under the net was measured. In addition, the thing which does not attach the setting retarder for cement was processed similarly, and it was set as the comparative example 3.

  As a result, as shown in Table 4, in Experimental Example 6 of the present invention, the ratio of the granulated material that passed through the 9.5 mm sieve was higher than that of Comparative Example 3, and the adhesion between the granulated materials was suppressed.

As described above, according to the present embodiment, it is possible to delay the curing reaction of the granulated product at an arbitrary time, and due to heavy machinery or the like that must be frequently performed to prevent the granulated product from sticking to each other. It will be possible to set the granulation sediment breaking work at a free time.
Furthermore, the amount of organic compounds such as soluble sugars or carboxylic acids used can suppress the curing reaction of the granulated product, and it is possible to produce a granulated product that requires moderate disintegration such as fertilizer and snow melting agent. Is easier to do.
In addition, once a granulated product is formed, a soluble sugar or a carboxylic acid organic compound is added so as to adhere to the surface of the granulated product, so that the granulated product does not affect the strength of the granulated product itself. It is possible to prevent sticking between objects, and it is possible to further reduce the amount of soluble sugar or carboxylic acid organic compound to be added.

Claims (2)

In the method of granulating and solidifying a powder material having self-hardening properties such as combustion ash and steelmaking dust,
Step 1 of mixing and granulating a granulated product by adding an organic compound such as a soluble sugar or carboxylic acid to the powder material;
After the step 1, comprising a step 2 of applying a physical action to the granulated product,
By the step 1, the progress of the curing reaction of the granulated product is delayed to an arbitrary time,
The method of granulating and solidifying a powder material, characterized in that the step 2 further prevents the granules from sticking to each other.
In the method of granulating and solidifying a powder material having self-hardening properties such as combustion ash and steelmaking dust,
Step 3 of granulating the powder material into a granulated product,
A step 4 of attaching an organic compound such as a soluble sugar and a carboxylic acid to the surface of the granulated product granulated by the step 3;
After the step 4, the step 5 of applying a physical action to the granulated product,
By the step 4, the progress of the curing reaction on the surface of the granulated product is delayed to an arbitrary time,
The method of granulating and solidifying a powder material, wherein the step 5 further prevents adhesion between the granulated materials.

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