JP2007069185A - Method for washing inorganic matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inorganic matter washing method by which chlorine contained in inorganic matter is easily and selectively removed with a suppressed amount of SS generated at the time of washing and suppressed elution of harmful heavy metals and which is excellent in solid-liquid separation, wherein the chlorine is contained in inorganic matter such as incinerator ashes, incinerator fly ashes, molten fly ashes generated at the time of incinerating municipal refuse and industrial wastes; carbides obtained at the time of carbonization of municipal refuse and industrial wastes; or garbage incineration residues dug out of a final disposal site where the garbage incineration residues are buried. <P>SOLUTION: The method for washing inorganic matter is for removing chlorine by granulating inorganic matter such as incinerator ashes, incinerator fly ashes, molten ashes, carbides, or dug out incineration residues and successively washing the granulated matter. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention embeds incineration ash, incineration fly ash and molten fly ash generated during incineration of general waste and industrial waste, carbide obtained during carbonization of general waste and industrial waste, or waste incineration residue The present invention relates to a cleaning method for removing chlorine contained in inorganic substances such as waste incineration residue excavated from a final disposal site.

  Most of the incineration residues such as incineration ash, incineration fly ash and molten fly ash generated during incineration of general waste and industrial waste are landfilled after stabilization as necessary. However, in recent years, it has become difficult to secure a final disposal site, and effective use of incineration residue has become a major issue.

  In addition, as one of the processes for treating general waste and industrial waste, carbide obtained by carbonizing waste has a high calorific value and is porous. Has been made.

  On the other hand, the existing final disposal site is dug up, the excavated waste is effectively used, and the final disposal site is regenerated to secure the landfill capacity. Of the excavated waste, effective utilization of waste incineration residue is a major issue.

  Effective methods of using inorganic substances include incineration ash, incineration fly ash, molten fly ash, and excavated waste incineration residue as a raw material for cement or as a secondary material by firing, and in the case of carbide, alternative fuel, adsorbent, and soil improvement Materials and the like. However, a large amount of chlorine remains in these waste-derived inorganic substances. If these inorganic materials are used as raw materials as cement raw materials as they are, not only will the chlorine component adhere to the cement manufacturing plant and cause clogging, and stable operation will not be ensured, but the manufactured cement will also be chlorine-free. Since there is a case where corrosion of reinforcing bars is caused, the amount of use is considerably limited, and an efficient chlorine removal technique is required.

  Therefore, paying attention to the fact that chlorine contained in inorganic substances is mainly water-soluble, dechlorination is generally performed by washing with water. Many techniques for eluting chlorine in incineration ash and incineration fly ash into water are known. For example, one or more of water, carbon dioxide, combustion exhaust gas, or acid is added to the incineration ash as a cleaning agent. After removing substances that obstruct the production of cement or cement-based solidified material from incineration fly ash, the method of using solid content as cement (for example, see Patent Document 1), removing foreign substances by classifying incineration ash, etc. After that, washing with water, removing chlorine and making cement raw material (see, for example, Patent Document 2), making the flow of ash and water counter-current, and also pulverizing and ashing the surface when mixing ash and water A method of performing desalting by performing water washing in a plurality of stages while performing the action of peeling off the deposits to be coated is known (for example, see Patent Document 3).

  In addition, as a method for removing chlorine from the carbide, for example, the carbide obtained by carbonization is separated into metals, then wet pulverized, then washed in a washing water tank, dehydrated and dried, and desalted. A method for obtaining a pulverized product of carbide as a product (for example, see Patent Document 4) is known.

Furthermore, as a method of reclaiming waste incineration residue excavated from the final disposal site as a raw material for cement, for example, excavating landfill disposal waste, removing coarse material with heavy machinery, and then supplying landfill disposal waste to a sieve sorter. In addition, a method is known in which water is added to sieve passing waste to wash away internal water-soluble components and used as a raw material and fuel for cement production (see, for example, Patent Document 5).
JP-A-9-187748 JP-A-11-322238 Japanese Patent Laid-Open No. 2003-211129 JP 2002-95883 A JP 2005-41714 A

  However, the methods disclosed in Patent Document 1, Patent Document 2 and Patent Document 5 described above perform washing including a portion having a fine particle diameter in ash, so that a particulate suspended matter (SS) is obtained during solid-liquid separation. ) Will be transferred to the washing drainage side. This SS contains some harmful heavy metals such as lead and cadmium in the form of fine particles, and the harmful heavy metals are also eluted, which has a problem that the waste water treatment performed later is burdened. . In addition, the methods disclosed in Patent Document 3 and Patent Document 4 described above have complicated facilities, and the water content of the washed product obtained is high because the washing is performed while the ash is being refined. There was also a problem.

  Furthermore, in the conventional method described above, a centrifuge or a filter press is used for the operation of solid-liquid separation. However, in order to perform cleaning including fine parts, the cleaning inorganic substance partially in the form of slurry is contained in the apparatus. There was also a problem in terms of handling, such as adhesion, which required regular cleaning work.

  The present invention provides an inorganic cleaning method capable of suppressing the amount of SS generated during cleaning and elution of toxic heavy metals, easily removing chlorine contained in the inorganic material, and obtaining an inorganic material having a low water content. The purpose is to do.

  As a result of intensive studies to solve the above problems, the inventors of the present invention granulated an inorganic substance and washed the granulated product, thereby cleaning the filtrate more than water washing without performing granulation treatment. It was found that the chlorine contained in the inorganic material can be selectively removed while suppressing the occurrence of SS, and the solid-liquid separation of the washed product becomes easier, and the present invention has been achieved.

  Furthermore, for inorganic substances that contain high concentrations of toxic heavy metals and may be dissolved, granulate after performing stabilization treatment to prevent elution of heavy metals, and then wash the granulated product to obtain granulated products. Finds that chlorine contained in inorganic substances can be selectively removed while suppressing the generation of SS and elution of heavy metals in the washing filtrate, compared to water washing without crystallization treatment, and the solid-liquid separation of the washed substance becomes easier. The present invention has been reached.

  That is, the present invention is from the group consisting of incineration ash, incineration fly ash, molten fly ash, carbide obtained by carbonization of waste, and waste incineration residue excavated from the final disposal site where waste incineration residue is buried It summarizes a method for washing an inorganic substance, characterized by granulating one or more selected inorganic substances and then removing chlorine by subjecting the obtained granulated substance to a washing treatment, preferably granulation In the method for cleaning an inorganic material, the particle size of the product is 1 to 100 mm. Preferably, the cleaning treatment is performed by adding an aqueous solution containing a carbonate as a cleaning water to the granulated material for solid-liquid separation. It is the above-described cleaning method, and more preferably, the inorganic material cleaning method described above, wherein the inorganic material is subjected to stabilization treatment before granulating the inorganic material.

  According to the present invention, incineration ash generated during incineration of general waste and industrial waste, incineration fly ash and molten fly ash, carbide obtained during carbonization of general waste and industrial waste, or waste incineration residue, etc. Chlorine can be effectively removed from various inorganic materials such as garbage incineration residue excavated from the final disposal site where the waste is buried. In addition, the resulting washed product has a low moisture content, making it easy to handle, and effectively using the water washing residue obtained in this washing process as various raw materials that can be recycled at a higher rate. can do.

  Hereinafter, the present invention will be described in detail.

  Inorganic materials subject to cleaning in the present invention are incineration ash, incineration fly ash, molten fly ash, carbide obtained by carbonization of waste or waste incineration excavated from the final disposal site where waste incineration residue is buried It is a residue. Incineration ash refers to ash produced when incineration of general waste and industrial waste in an incinerator. Incineration fly ash refers to the treatment of acid gas generated during incineration of general waste and industrial waste. The generated ash is referred to as molten fly ash, which is the ash generated when the incinerated ash or the acid gas generated when the incinerated fly ash is melted is treated.

  Moreover, the carbide | carbonized_material obtained by carbonization of a waste means the thing obtained when processing a general waste and an industrial waste with a carbonization furnace. Garbage incineration residue excavated from the final disposal site where waste incineration residue, etc. is buried is roughly 100mm of the waste generated when the final disposal site is excavated, and roughly sorted by magnetic separation. After drying the portion of 100mm or less from which dust has been removed, it is obtained by separating it into earth and sand, combustible materials + plastics, bottles / cans, stones / rubbles, etc., including incineration residue, after vibration sieve and hand sorting It refers to the waste incineration residue that is one of the things.

  The above-mentioned inorganic substances are in the form of powder having a particle size of 1 to 50 μm for incinerated fly ash, molten fly ash, and carbide, and hardly contain moisture at 0.5% to 10%. On the other hand, the incineration ash and the waste incineration residue dug up from the final disposal site are sandy with a particle size of 0.1 to 100 mm, and the moisture is often 20 to 50%. In general, incineration fly ash and molten fly ash have a chlorine concentration of about 10 to 20 times higher than incineration ash and waste incineration residue excavated from the final disposal site.

  In addition, the inorganic substance in this invention should just be 1 or more types selected from these, and what mixed several inorganic substances may also be made into a process target object.

  In the present invention, it is essential to granulate the inorganic substances shown above. Any means may be used for the granulation method used by this invention, For example, granulation by extrusion granulation, compression granulation, rolling granulation, stirring granulation etc. is mentioned. Of these, extrusion granulation is preferable in terms of handling the granulated product and solid-liquid separation after washing. In some cases, a two-stage combination may be used.

  Specifically, in the case of screw-type extrusion granulation, a flat plate die having a large number of holes of a predetermined size as the diameter of the granulated product is vertically attached to the tip of a screw case on a cylinder. By rotating, a powder obtained by kneading an inorganic substance and water is pressed, compressed and pressed toward a die, and extruded from a hole to obtain a granulated product.

  In the present invention, the shape of the granulated product is not particularly limited, but the molded product is preferably spherical or cylindrical in that the washing water is uniformly distributed to the granulated product. The specific size of the granulated product is preferably 1 to 100 mm, particularly preferably 2 to 10 mm. If it is less than 1 mm, dehydration from the granulated product becomes difficult, and heavy metals are more likely to elute in the form of particles, and if it exceeds 100 mm, the washing water sufficiently penetrates into the granulated product. Therefore, it is not preferable because chlorine removal becomes difficult.

  In addition, about the inorganic substance before granulation, when granulation is difficult as it is, granulation may be performed after pulverizing the inorganic substance to make a powder state once. For this purpose, pulverization is preferably performed to such an extent that the granulator is not damaged. For example, it may be pulverized until the particle size becomes 1 mm or less by a compression / shear method using a roller mill.

  Further, at the time of granulation in the present invention, granulation may be performed by adding a binder to the inorganic material in order to prevent the granulated material from collapsing. Examples of the binder used here include inorganic components such as cement, gypsum, water glass and bentonite, and organic components such as starch, glue, natural rubber, tar, asphalt, molasses, pulp, and resin. Of these, cement and asphalt are preferable in terms of price. The binder is added in an amount of 0.1 to 50% by weight, more preferably 1 to 30% by weight, and most preferably 5 to 20% by weight based on the inorganic substance.

  In the present invention, it is next necessary to perform a washing treatment on the granulated product obtained above. In the washing treatment, washing water is added to the granulated product, and then washing operation is performed using immersion washing or mechanical stirring.

  Although it is desirable that the washing treatment in the present invention is carried out until chlorine contained in the granulated product is almost removed, the numerical value is not limited. However, it is preferable that water-soluble chlorine is almost removed, specifically, the electrical conductivity of the cleaning liquid after the cleaning treatment is 4.0 mS / cm or less, more preferably 2.0 mS / cm or less, most preferably 1.0 mS / cm. If it is less than cm, the cleaning process can be terminated.

  Further, as the washing water used for the washing treatment in the present invention, an aqueous solution containing carbonate may be used in order to increase the chlorine removal effect, for example, a granulated product using a 1% aqueous solution of sodium carbonate. The immersion cleaning may be performed.

  The amount of washing water added is preferably the solid-liquid ratio of the granulated product and the washing water, the wet weight of the granulated product: the capacity of the washing water = 1: 1 to 1:30, particularly 1: 2 to 1:10. preferable. If it is less than 1: 1, mixing and chlorine dissolution become difficult, and if it exceeds 1:30, the equipment capacity and the wastewater treatment burden increase, which is not preferable. Here, the wet weight of the granulated product refers to the weight in a state where the granulated product contains moisture.

  In the present invention, the temperature of the washing water is preferably set to 30 to 100 ° C., more preferably 40 to 80 ° C., in order to increase the chlorine removal effect. As an operation, the temperature may be adjusted using a constant temperature water bath so that the washing water has a predetermined liquid temperature.

  In the case of using mechanical agitation, it is preferable to agitate so that the granulated material is not crushed.For example, in a mesh container having a large number of holes so that the agitation paddle does not touch the granulated material using a rotary agitator. Stirring can be performed for 10 minutes to 2 hours while covering the stirring section.

  In the present invention, in order to increase the chlorine removal effect, multi-stage cleaning may be used. For example, first cleaning by immersion cleaning or other methods is performed first, and the water washing residue obtained after solid-liquid separation is immersed. You may perform washing | cleaning or the 2nd washing | cleaning by another method, and may perform dehydration after that.

  Next, in the present invention, dehydration is performed by solid-liquid separation to separate into a water washing residue and a water washing filtrate. As a means for dehydrating, any method may be used, for example, gravity sedimentation separation or centrifugation is used.

  In the present invention, it is preferable to perform a stabilization treatment on the inorganic material before granulating the inorganic material. As the stabilization treatment, it is preferable to add one or both of cement and heavy metal fixing agent to the inorganic material so that the heavy metal is fixed in the inorganic material. As such cement, various portland cements such as normal, early strength, ultra-early strength, medium heat, special, etc., as well as mixed cement mixed with slag, fly ash, etc. can be used. Strong Portland cement is preferred in terms of stabilizing heavy metals. In addition, the heavy metal fixing agent is not particularly limited as long as it has an organic chelate-forming group and the chelate-forming group and heavy metal can be firmly bonded to stabilize various heavy metal ions. Examples of such organic chelating agents include dithiocarbamic acid, imine, and pyrrolidine.

The amount of these additives is not limited, but usually 0.1 to 50% by weight, more preferably 1 to 30% by weight, and most preferably 3 to 20% by weight of cement is added to the inorganic substance, and the heavy metal is fixed. The agent is added in an amount of 0.1 to 30% by weight, more preferably 1 to 20% by weight, and most preferably 3 to 10% by weight.

  Specifically, a predetermined amount of ordinary Portland cement, a predetermined amount of a dithiocarbamic acid-based heavy metal fixing agent and a predetermined amount of moisture are simultaneously supplied into a kneader to an inorganic material that is likely to elute heavy metals. The stabilization process is performed. Thereafter, the stabilized product is granulated using a commercially available molding machine or granulator to produce a granulated product. The granulated product may be washed to obtain a desalted water washing residue.

  The inorganic substance from which chlorine has been removed according to the present invention is adjusted for moisture content and particle size by drying and pulverization, and is then carried out and used as various raw materials. The lower the chlorine concentration after the cleaning treatment, the better. However, in the case of a cement raw material, it is preferable to set it to 350 ppm or less as much as possible on the dry basis, which is the chlorine content allowable amount of the JIS standard cement raw material. As the chlorine concentration decreases, the rate at which the material obtained by this cleaning process is replaced with a portion of the cement raw material increases.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are block diagrams showing an inorganic material processing apparatus according to two embodiments of the present invention. In any embodiment, a granulating device 5 for granulating an inorganic material, a cleaning device 8 for cleaning the granulated material, a solid-liquid separation device 9 and a waste water treatment facility 12 are provided.

  In the embodiment shown in FIG. 1, first, an inorganic substance is put into the granulator 5 and granulation is performed. The granulated product is transferred to the cleaning device 8 and mixed with the cleaning water. In the mixing method according to the present invention, the cleaning water 7 is added to the cleaning device 8 and then the cleaning operation is performed using immersion cleaning or mechanical stirring. Next, dehydration is performed by the solid-liquid separation device 9 to separate into a water washing residue 10 and a water washing filtrate 11. The water washing filtrate is separated into the waste water 13 and the waste water treatment residue 14 after the trace heavy metals are removed by the waste water treatment device 12. The wastewater may be neutralized and discharged outside the system, or salt recovery may be performed by concentrated crystallization.

  In the embodiment of FIG. 2, first, an inorganic substance is charged into the stabilization processing apparatus 2 to perform stabilization processing of heavy metal. The stabilized inorganic substance 4 treated by the stabilization treatment apparatus 2 is put into the granulation apparatus 5 and granulated as in the case of FIG. In addition, when the stabilization processing apparatus is an apparatus that also serves as an inorganic material granulation, this apparatus may be used. The other configuration of FIG. 2 is the same as that of FIG.

  Hereinafter, the present invention will be specifically described by way of examples.

  In this example, the chlorine content was measured according to an alkali melting method known as a method for measuring the total amount of metals in a sample. That is, a predetermined amount of sodium potassium carbonate was added to the sample, and the mixture was alkali-melted at 900 ° C., and the melt was measured by mercury (II) thiocyanate absorptiometry, and the obtained value was defined as the amount of chlorine.

Example 1
Processing was performed according to the flow chart shown in FIG. The waste incineration residue excavated from the final disposal site where the incineration fly ash discharged from the fluidized bed waste incineration facility and stabilized is mainly buried is used as the inorganic substance (1). ). When the particle size distribution of this inorganic substance was examined, 90% or more of the particles were 1 mm or less. The water content was 11.0% and the chlorine content was 40,800 mg / kg-dry.

  As the granulator 5, an extrusion molding machine was used. The extrusion molding machine used here was a screw pre-extrusion apparatus (manufactured by Fuji Powder Co., Ltd., EXD-60 type). An inorganic substance (1) was added to the granulator 5 to perform granulation, and a cylindrical granule 6 (cylindrical height of about 8 mm) was obtained. The chlorine-containing concentration of this granulated product 6 was 51,700 mg / kg-dry.

  Next, 200.0 g of the prepared granulated product 6 was put into the cleaning device 8. The cleaning device 8 is a commercially available hand-made perforated basket (mesh width of about 0.64 mm) and a bowl (both made of polypropylene, capacity 1.5 L). Place the granulated product 6 on a hand-punched basket and immerse it in a bowl filled with a predetermined amount of washing water 7 (1,000 mL, solid-liquid ratio 1: 5) at room temperature (20-25 ° C). It was left to stand for 1 day, that is, immersion cleaning was performed. As the washing water 7, pure water was used. After the immersion cleaning, solid-liquid separation was performed with the solid-liquid separator 9. As the solid-liquid separation device 9, the perforated basket having been dipped and washed is taken out of the bowl, and left at the top of the bowl for 1 hour for draining. As a result, 180.0 g (dry amount) (chlorine concentration: 7,900 mg / kg-dry, water content: 30.8%) and 880 mL of water-washed filtrate (1) (SS content concentration: 6,950 mg / L) were obtained.

Example 2
Processing was performed according to the flow chart shown in FIG. Inorganic fly ash (chlorine-containing concentration 62,800 mg / kg-dry, moisture content 7.5%) discharged from the incineration facility was supplied to the stabilization treatment device 2 as the inorganic substance (2), and the stabilization treatment was performed. As a stabilization treatment device, a cement solidification treatment device (TMHW-50 type, manufactured by Honda Seiko Co., Ltd.) was used, and the mixture was kneaded with a cement addition amount of about 4% by weight and humidified water of about 25% by weight. Thereafter, the stabilized inorganic substance 4 is put into the granulator 5. A granulated product 6 (diameter: about 10 mm, spherical shape) was obtained using a bread type granulator (YG-2500 type, manufactured by Yamato Kikai Co., Ltd.) as the granulator. The granulated product 6 had a chlorine-containing concentration of 63,000 mg / kg-dry.

  Next, 200.0 g of the prepared granulated product 6 was put into the cleaning device 8. The cleaning device 8 is a commercially available hand-made perforated basket (mesh width of about 0.64 mm) and a bowl (both made of polypropylene, capacity 1.5 L). Place the granulated product 6 on a hand-punched basket and immerse it in a bowl filled with a predetermined amount of washing water 7 (1,000 mL, solid-liquid ratio 1: 5) at room temperature (20-25 ° C). It was left to stand for 1 day, that is, immersion cleaning was performed. As the washing water 7, pure water was used. After the immersion cleaning, solid-liquid separation was performed with the solid-liquid separator 9. As the solid-liquid separation device 9, take out the perforated basket that has been dipped and washed from the bowl and leave it on the top of the bowl for 1 hour to drain it, that is, solid-liquid separation by natural gravity sedimentation, and the chlorine concentration is 14,900. As a result of washing with water (2) having a mg / kg-dry content of 28.7% (2), 180.1 g (dry weight) and an SS content of 370 mg / L as a water-washed filtrate (2) were obtained in an amount of 900 mL.

Comparative Example 1
The same operation as in Example 1 was carried out except that 200.0 g of the same inorganic substance (1) as in Example 1 was directly charged into the washing device 8, and the water washing residue with a chlorine concentration of 8,100 mg / kg-dry and a water content of 43.0% ( 830 mL was obtained as a water-washed filtrate (3) having 184.0 g (dry weight) as 3) and an SS concentration of 11,300 mg / L.

Comparative Example 2
The same operation as in Example 2 was carried out except that 200.0 g of the same inorganic substance (2) as in Example 2 was directly charged into the washing apparatus 8, and the water washing residue with a chlorine concentration of 18,600 mg / kg-dry and a water content of 57.7% ( As 4), 149.9 g (dry weight) and SS content concentration was 87,000 mg / L, and 860 mL was obtained as a water-washed filtrate (4).

  Table 1 shows the chlorine content concentration and water content of the washing residues (1) and (2) obtained in Examples 1 and 2 and the washing residues (3) and (4) obtained in Comparative Examples 1 and 2. Shown in

Moreover, it shows in Table 2 about SS density | concentration and heavy metal density | concentration in the water washing filtrate (1)-(4) obtained in Example 1, 2 and Comparative Example 1,2.

From Table 1, it can be seen that there are differences in chlorine-containing concentration, moisture content, and SS concentration in the washing filtrate between the examples and comparative examples. That is, in Example 1, the chlorine concentration decreased from 8,100 mg / kg-dry to 7,900 mg / kg-dry and the moisture content decreased from 43.0% to 30.8% compared to Comparative Example 1, and Example 2 was compared. Compared to Example 2, the chlorine content concentration decreased from 18,600mg / kg-dry to 14,900mg / kg-dry, and the moisture content decreased from 57.7% to 28.7%. By washing after granulating inorganic substances It can be seen that the chlorine removal is effectively performed and the solid-liquid separation of the washed product is more efficiently performed.

  Table 2 also shows that there are differences in SS and heavy metal concentrations in the examples and comparative examples. That is, in Example 1, the SS concentration was changed from 11,300 mg / L to 6,950 mg / L, the Pb concentration was changed from 2.44 mg / L to 0.04 mg / L, and the Cd concentration was changed from 0.051 mg / L to 0.002 mg / L. L, T-Hg concentration from 0.0048 mg / L to below detection limit (<0.0005 mg / L), Se concentration from 0.013 mg / L to 0.002 mg / L, As concentration from 0.086 mg / L to detection limit In Example 2, the SS concentration was reduced from 87,000 mg / L to 370 mg / L and the Pb concentration was 7.25 mg / L to 0.02 mg / L. L, Cd concentration from 0.132 mg / L to 0.002 mg / L, T-Hg concentration from 0.0127 mg / L to below detection limit (<0.0005 mg / L), Se concentration from 0.031 mg / L to 0.002 mg The concentration of As has decreased from 0.257 mg / L to below the lower detection limit (<0.005 mg / L), and by washing after granulating inorganics, SS and hazardous heavy metals can be washed with water. It turns out that the elution prevention into a filtrate is also performed effectively.

It is a block diagram of the processing apparatus which shows the flow of the method of this invention. It is a block diagram of the processing apparatus which shows another flow of the method of this invention.

Explanation of symbols

1: Inorganic matter 2: Stabilizing treatment device 3: Stabilizing agent 4: Stabilizing inorganic material 5: Granulating device 6: Granulated product 7: Washing water 8: Washing device 9: Solid-liquid separation device 10: Washing residue 11: Washing filtrate 12: Wastewater treatment equipment 13: Wastewater 14: Wastewater treatment residue

Claims (4)

One or more inorganic substances selected from the group consisting of incineration ash, incineration fly ash, molten fly ash, carbide obtained by carbonization of waste, and waste incineration residue excavated from the final disposal site where waste incineration residue is buried A method for cleaning an inorganic material, characterized in that chlorine is removed by performing a cleaning process on the resulting granulated product. The method for cleaning an inorganic material according to claim 1, wherein the granulated product has a particle size of 1 to 100 mm. The method for washing an inorganic substance according to claim 1 or 2, wherein the washing treatment is performed by adding an aqueous solution containing a carbonate as washing water to the granulated product and performing solid-liquid separation. The method for washing an inorganic substance according to any one of claims 1 to 3, wherein the inorganic substance is subjected to stabilization treatment before granulating the inorganic substance.