JP2023102140A - Method for recovering noble metal from incineration ash using cement production facility - Google Patents

Abstract

To provide a method for efficient recovery of noble metals from incineration ashes by using a cement production facility while suppressing scattering of dioxin and odor and vibration and abrasion of a mill.SOLUTION: A method for recovering noble metals from incineration ashes using a cement production facility equipped with a roller mill for pulverization of a cement raw material containing one or more kinds selected from limestone and silica rock, a preheater for preheating the cement raw material pulverized product introduced from the roller mill, and a cement kiln for firing the cement raw material pulverized product introduced from the preheater includes: an incineration ash pretreatment step of breaking the incineration ashes, subjecting the broken products to magnetic force screening to recover a non-magnetically attracted material, and separating the non-magnetically attracted material into a first non-magnetically attracted material and a second non-magnetically attracted material based on a physical property or a chemical property of the non-magnetically attracted material; and a cement raw material pulverization step of pulverizing the first non-magnetically attracted material by a roller mill together with a cement raw material and separating them into a mill expulsion and a mill refined flour. The mill expulsion is then recovered.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a method for recovering precious metals from incineration ash using cement manufacturing equipment.

Conventionally, attempts have been made to recover precious metals from waste such as incineration ash by pulverization using a roller mill or by physical sorting.例えば、有価金属含有廃棄物を、所定粒径分布を有するミル精粉と、所定粒径分布よりも大径側にある粒径分布を有する粗粉を含むミル排石に竪型ローラーミルで粉砕する工程において、ミル排石中の有価金属の含有率が廃棄物中の有価金属の含有率よりも高くなるように粉砕し、得られたミル排石を選別して有価金属を回収する方法（特許文献１）、有価金属含有廃棄物から嵩密度が１．３ｔ／ｍ ³以上のミル排石が得られるように前記廃棄物を竪型ローラーミルで粉砕し、得られたミル排石を選別して有価金属を回収する方法（特許文献２）、廃棄物を粉砕部と形状識別部とを有する竪型ミルにて粉砕し、金属選別部により金属類を選別除去しつつ、セメント原料を製造する方法（特許文献３）等が提案されている。

JP 2016-89196 A Japanese Patent Application Laid-Open No. 2021-1362 JP 2013-28477 A

However, in the above-mentioned conventional method, a large amount of heat is consumed for drying the incinerated ash and an exhaust gas treatment facility is required, so the production cost rises, and when only a small amount of incinerated ash is targeted, it is difficult to realize from a profit perspective. In addition, it is possible to use a modifier when drying incinerated ash, but if only a small amount of incinerated ash is targeted, it is similarly unfeasible from a profit standpoint. In addition, incineration ash contains dioxins and metals and has a strong odor, so it is desirable to use equipment that can prevent the scattering of dioxins and odors accompanying dry grinding and suppress mill vibration and wear, but it is difficult to use existing cement manufacturing equipment as it is.
An object of the present invention is to provide a method capable of efficiently recovering precious metals from incineration ash while suppressing the scattering of dioxins and odors and the vibration and wear of mills while using cement manufacturing equipment.

The inventors of the present invention have found that by subjecting incinerated ash to a predetermined pretreatment process, it is possible to not only efficiently recover precious metals, but also to produce cement clinker while suppressing the scattering of dioxins and odors, and the vibration and wear of the mill, while using existing cement production equipment.

That is, the present invention provides the following [1] to [8].
[1] A method for recovering precious metals from incinerated ash using a cement production facility having a roller mill for pulverizing a cement raw material containing one or more selected from limestone and silica stone, a preheater for preheating the ground cement raw material introduced from the roller mill, and a cement kiln for firing the ground cement raw material introduced from the preheater,
an incineration ash pretreatment step of crushing incineration ash, subjecting the crushed material to magnetic separation to recover non-magnetic substances, and separating the non-magnetic substances into first non-magnetic substances and second non-magnetic substances based on the physical or chemical properties of the non-magnetic substances;
A cement raw material pulverizing step of pulverizing the first non-magnetic substance together with the cement raw material with a roller mill to separate it into mill waste stone and mill refined powder,
Collecting mill waste stones,
A method for recovering precious metals from incineration ash using cement manufacturing equipment.
[2] A method for treating incinerated ash using a cement production facility having a roller mill for pulverizing a cement raw material containing one or more selected from limestone and silica stone, a preheater for preheating the ground cement raw material introduced from the roller mill, and a cement kiln for firing the ground cement raw material introduced from the preheater,
An incineration ash treatment step of crushing incineration ash, subjecting the crushed material to magnetic separation to recover non-magnetic substances, and separating the non-magnetic substances into first non-magnetic substances and second non-magnetic substances based on the physical or chemical properties of the non-magnetic substances;
a cement raw material pulverizing step of pulverizing the first non-magnetic substance together with the cement raw material in a roller mill to separate the mill waste stone and mill refined powder;
A method for treating incineration ash using cement production equipment, including a cement firing step of putting mill powder into a preheater and putting a second non-magnetic substance into the kiln bottom of a cement kiln.
[3] The precious metal recovery method or treatment method according to [1] or [2] above, wherein in the incineration ash treatment step, non-magnetic substances are separated into first non-magnetic substances and second non-magnetic substances based on the particle size of the non-magnetic substances.
[4] The noble metal recovery method or treatment method according to [3] above, wherein the particle size of the first non-magnetic substance is 0.1 mm or more and the particle size of the second non-magnetic substance is less than 0.1 mm.
[5] In the incineration ash treatment step, the non-magnetic substances are separated into the first non-magnetic substances and the second non-magnetic substances based on the odor index of the non-magnetic substances, [1] to [3].
[6] The noble metal recovery method or treatment method according to [5] above, wherein the first non-magnetic substance has an odor index of less than 30 and the second non-magnetic substance has an odor index of 30 or more.
[7] In the incineration ash treatment step, the non-magnetic substances are separated into the first non-magnetic substances and the second non-magnetic substances based on the dioxin toxicity equivalent of the non-magnetic substances.
[8] The noble metal recovery method or treatment method according to [7] above, wherein the first non-magnetic substance has a dioxin toxicity equivalent of less than 0.01 ng-TEQ/g and the second non-magnetic substance has a dioxin toxicity equivalent of 0.01 ng-TEQ/g or more.

According to the present invention, while using existing cement manufacturing equipment, it is possible not only to efficiently recover precious metals, but also to manufacture cement clinker while suppressing scattering of dioxins and odors, and vibration and wear of the mill. Therefore, the present invention is useful as a method for treating incinerated ash.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing an example of a cement manufacturing facility and an incinerated ash pretreatment system applicable to the present invention;

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted. Also, for convenience of illustration, the dimensional ratios in the drawings do not necessarily match those in the description.

The method for recovering precious metals and the method for treating incinerated ash according to the present invention are characterized in that the incinerated ash is subjected to a predetermined pretreatment step and then treated using cement manufacturing equipment.
Existing cement manufacturing equipment can be used as the cement manufacturing equipment. FIG. 1 shows an example of a cement production facility and an incinerated ash pretreatment system applicable to the present invention.

The cement manufacturing facility shown in FIG. 1 includes a roller mill for pulverizing a cement raw material containing one or more selected from limestone and silica stone, a preheater for preheating the pulverized cement raw material introduced from the roller mill, and a cement kiln for firing the pulverized cement raw material introduced from the preheater.

Cement raw materials are usually put into a roller mill through a dryer if necessary.
The roller mill includes, for example, a device that pulverizes the mixture while compressing and shearing it between a plurality of rollers and a rotating table. The pulverized cement raw material pulverized material is classified by an upper separator to obtain refined mill powder, and the mixture having a large particle size is pulverized again by rollers and a table. A dam ring is provided around the table, and mill waste is discharged after dropping over the dam ring.

The cement raw material is heated and pulverized in the roller mill under the exhaust gas supplied from the cement kiln, and then supplied to the preheater through the raw material supply channel. Then, after being preheated by a preheater, it is charged into a cement kiln and fired to become a cement clinker.

The preheater shown in FIG. 1 is of a multi-stage cyclone type in which a plurality of cyclones are connected in multiple stages from the bottom to the top, and preheats the pulverized cement raw material to a predetermined temperature (800 to 900 ° C.) using the exhaust gas of the cement kiln.

A cement kiln has, for example, a laterally cylindrical kiln shell that slopes downward toward the downstream side, and rotates the kiln shell around its central axis while heating it with a burner that uses heavy oil or pulverized coal as a fuel to heat the cement raw material supplied from the preheater to a temperature of 1000° C. or higher and sinter it to produce cement clinker. After that, the cement clinker is cooled by a cooler connected to the front part of the kiln provided on the downstream side of the cement kiln and sent to the finishing process. The above is the same as the operation in a normal cement manufacturing facility.

This cement manufacturing facility is provided with an incineration ash pretreatment system for pretreating incineration ash and introducing it into the kiln bottom of the roller mill and the cement kiln.
This incineration ash pretreatment system magnetically sorts crushed incineration ash, and based on the physical or chemical properties of the obtained non-magnetic substances, separates them into first non-magnetic substances and second non-magnetic substances, supplies the first non-magnetic substances to the roller mill of the cement manufacturing facility, and directly throws the second non-magnetic substances into the kiln bottom of the cement kiln.

Next, an embodiment of the method for recovering precious metals from incinerated ash and the method for treating incinerated ash according to the present invention using the cement production facility and the incinerated ash pretreatment system configured as described above will be described.

In the incineration ash pretreatment system, as shown in FIG. 1, first the incineration ash is crushed. As a result, the noble metal adhering to the ash or the like can be peeled off while crushing the aggregated ash particles.
As the incineration ash, incineration main ash (bottom ash) that accumulates at the bottom of the incinerator when city refuse, industrial waste, sewage sludge, or the like is incinerated is preferably used. More specifically, for example, in addition to industrial wastes such as sludge, waste plastics, metal scraps, glass scraps, concrete scraps, ceramic scraps, slag, and debris, shredder dust generated by crushing scrapped automobiles and scrap home appliances, incineration bottom ash obtained by incinerating general waste, etc. can be used. The incineration bottom ash may contain incineration fly ash, which is dust in the exhaust gas when incinerated.
Among them, the incinerated ash is preferably municipal waste incinerated ash (including, for example, dug up incinerated ash). Municipal waste incineration ash usually contains valuable metals such as copper, zinc, gold, silver, palladium, platinum, etc., in addition to chromium and lead, which are cement-repellent components.

The incineration ash contains moisture due to water cooling and water sprinkling to prevent dust generation, but it can be used as it is.
Incineration ash usually has a moisture content of 15-35% by weight and a size of usually less than 40 mm.

A crusher can be used to crush the incinerated ash. Examples include jaw crushers, impact crushers, hammer crushers, roll crushers and rotary crushers.
The crushing treatment may be performed twice or more. The same or different crushers can be used when performing more than once.

Next, the crushed incineration ash is magnetically sorted to separate into magnetic and non-magnetic substances, and the non-magnetic substances are recovered. As a result, metal debris and the like in the incinerated matter can be removed as magnetic substances.
A magnetic force sorting machine can be used for magnetic sorting, and any of a drum type, a pulley type, and a suspension type can be used, and there is no particular limitation.
The surface magnetic flux density of the magnetic force sorter is preferably 700 to 10,000 gauss, more preferably 1,000 to 7,500 gauss, and still more preferably 1,500 to 5,000 gauss from the viewpoint of removing magnetic substances.
Magnetic sorting may be performed twice or more. When performing two or more times, the same or different magnetic force sorters may be used, or the same or different surface magnetic flux densities may be used.

Next, based on the physical properties or chemical properties of the non-magnetic substances, the non-magnetic substances are classified into first non-magnetic substances and second non-magnetic substances.
Physical properties of the non-magnetic substance include, for example, particle size, shape, color, specific gravity, and electrical conductivity.
Chemical properties of the non-magnetic substance include, for example, odor, specific chemical substance content, and ignition loss.
Among them, in terms of easy separation of the first non-magnetic substance in which the noble metal is concentrated, it is preferable to use the particle size as an index in the case of physical properties, and it is preferable to use the odor or the content of a specific chemical substance as an index in the case of chemical properties.

A sieve sorter can be used to separate the non-magnetic substances based on particle size. The sieve separator may be, for example, any of vibration type, in-plane motion type, rotary type, and stationary type.
Further, two or more sieves having different meshes may be used to subdivide into a plurality of particle size groups. For example, non-magnetic substances can be subdivided into three or more particle size groups.
The inventors of the present invention found that there is a correlation between the concentration of noble metals in non-magnetic particles and the grain size, and that precious metals are unevenly distributed in grain groups with grain sizes of 0.1 mm or more, preferably grain groups with grain sizes of 0.5 mm or more, in non-magnetic materials. Therefore, by using a sieve with a sieve mesh of 0.1 mm, preferably a sieve with a particle size of 0.5 mm, the under-sieving is collected as the second non-magnetic substance, and the residue is collected as the first non-magnetic substance, whereby the first non-magnetic substance in which the noble metal is concentrated can be efficiently collected.

When subdividing the non-magnetic substances into a plurality of particle size groups, it is preferable to separate them into the following combinations of particle size groups from the viewpoint of noble metal recovery efficiency. The particle size group having the smallest particle size is recovered as the second non-magnetic particles, and the remaining particle size groups are recovered as the first non-magnetic particles.
(1) A combination of a non-magnetic substance with a particle size of less than 0.1 mm, a non-magnetic substance with a particle size of 0.1 mm or more and less than 5 mm, and a non-magnetic substance with a particle size of 5 mm or more (2) A combination of a non-magnetic substance with a particle size of less than 0.5 mm, a non-magnetic substance with a particle size of 0.5 mm or more and less than 5 mm, and a non-magnetic substance with a particle size of 5 mm or more (3) A non-magnetic substance with a particle size of less than 0.5 mm, a non-magnetic substance with a particle size of 0.5 mm or more and less than 5 mm, and a non-magnetic substance with a particle size of 5 mm or more and less than 20 mm A combination of a magnetic substance and a non-magnetic substance with a particle size of 20 mm or more

Alternatively, the separation may be based on the odor index of non-magnetic substances. Here, the "odor index" in this specification is an odor index defined in Article 1 of the Ordinance for Enforcement of the Offensive Odor Control Law, and is defined as "in accordance with the method specified by the Minister of the Environment, when the odor of the gas or water used as a sample is diluted to the point where the odor of the gas or water as a sample is no longer detectable by the human sense of smell, the dilution factor (odor concentration) is obtained, and the logarithm of the odor concentration value is multiplied by ten."

In the present invention, the odor concentration is measured by the three-point comparison odor bag method, and the odor index is calculated by the following formula (1).

Odor index = 10 x log (odor concentration) (1)

For example, an odor index of 2500 to 6000 is converted to an odor index of 34 to 38, and an odor concentration of 200 to 450 is converted to an odor index of 23 to 27. The smaller the odor index, the weaker the odor intensity. Generally, it is said that the odor index is about 3, at which even a healthy person cannot smell the odor.

The present inventor found that there is a correlation between the concentration of noble metals in non-magnetic particles and the odor index, and that noble metals are unevenly distributed in grain groups with an odor index of less than 30 in non-magnetic particles. Therefore, by collecting the grain group with an odor index of 30 or more as the second non-magnetic substance and the remainder as the first non-magnetic substance, the first non-magnetic substance in which the noble metal is concentrated can be efficiently collected.

Furthermore, it may be classified based on the dioxin toxicity equivalent of non-magnetic substances. The dioxin toxicity equivalent can be measured, for example, according to the "simple measurement method manual" for exhaust gas, dust, and cinders established by the Ministry of the Environment in March 2010.
As used herein, the term "dioxin" refers to 2,3,7,8-tetrachlorodibenzo-p-dioxin and analogous compounds thereof, and is a concept that includes polychlorodibenzo-p-dioxins (PCDDs) having a dibenzo-p-dioxin nucleus substituted with 1 to 8 chlorine atoms and polychlorodibenzofurans (PCDFs) having a dibenzofuran nucleus substituted with 1 to 8 chlorine atoms.

The present inventors found that there is a correlation between the concentration of the noble metal in the non-magnetic substance and the dioxin toxicity equivalent, and that the precious metal is unevenly distributed in the grain groups with the dioxin toxicity equivalent of less than 0.01 ng-TEQ/g in the non-magnetic substance. Therefore, by collecting grain groups with a dioxin toxicity equivalent of 0.01 ng-TEQ/g or more as the second non-magnetic substances and collecting the remainder as the first non-magnetic substances, the first non-magnetic substances in which the noble metal is concentrated can be efficiently collected.

Furthermore, the inventors have found that the particle size, odor index, and dioxin toxicity equivalents described above are correlated with each other. That is, it has been found that, among non-magnetic particles, grains with a grain size of 0.1 mm or more, preferably grains with a grain size of 0.5 mm or more, have an odor index of less than 30 and a dioxin toxicity equivalent of less than 0.01 ng-TEQ/g. Therefore, by sorting the non-magnetic substances using one or more selected from them as an index, the first non-magnetic substances in which the noble metal is concentrated can be efficiently recovered.

In the present invention, the separated first non-magnetic substances are pulverized together with cement raw materials in a roller mill of a cement production facility.
The cement raw material contains at least one or more selected from limestone and silica stone, but may contain iron raw materials such as clay, coal ash, and steelmaking slag.
The first non-magnetic substance and the raw material for cement may be put into the roller mill in any order, as long as they coexist in the roller mill during pulverization.

The ratio of the cement raw material and the first non-magnetic substance is preferably 1/300 or more, more preferably 1/200 or more, more preferably 3/20 or less, and still more preferably 1/10 or less, in terms of the efficiency of recovering precious metals and ensuring the quality of cement.

The pulverization time can be appropriately set depending on the production scale and the like, but it is usually 100 to 400 t/h, preferably 200 to 300 t/h, from the viewpoint of pulverization efficiency and noble metal recovery efficiency.

The first non-magnetic material is ground in a roller mill together with the cement raw material and separated into mill waste and mill fines. Then, mill waste stone in which precious metals are concentrated is recovered.
In this way, valuable precious metals can be efficiently recovered and reused from incineration ash containing metals that are cement-repellent components.

On the other hand, the mill refinement is put into the preheater of the cement production facility.
The refined mill powder fed into the first stage cyclone of the preheater is preheated by the high temperature exhaust gas from the cement kiln rising from below as it sequentially falls to the lower cyclone, and is finally introduced into the bottom of the cement kiln from the lowest stage cyclone. In addition, the second non-magnetic material described above is also thrown into the kiln bottom of the cement kiln.
In the cement kiln, the cement clinker is heated and calcined by the flue gas from the main burner in the process of being gradually sent from the kiln bottom side to the kiln front side. Thus, a cement clinker can be produced using the second non-magnetic substance as a raw material.

When cement clinker is produced, it is heated in an atmosphere of 1000° C. or more for several tens of minutes or more, so dioxins and odorous substances are decomposed into harmless substances. Incidentally, dioxin can be decomposed by staying in a high temperature atmosphere of 800° C. or higher for 2 seconds or longer.
Therefore, by decomposing incineration ash containing dioxins and odorous substances into harmless substances, it is possible to effectively utilize the ash as a raw material for cement while improving the environment.

Although the present invention has been described in detail based on the embodiments, the present invention is not limited to the above embodiments. Various modifications are possible for the present invention without departing from the gist thereof. For example, in the incineration ash pretreatment system shown in FIG. 1, the non-magnetic substances separated by magnetic separation are separated using physical properties or chemical properties as indicators, but the non-magnetic substances may be washed with water for the purpose of chlorine removal, etc., and then subjected to separation. The method of washing the non-magnetic substance with water is not particularly limited as long as the non-magnetic substance is brought into contact with water. The amount and temperature of water used can be selected as appropriate. The washed material can be separated using a dehydrator. Similarly, after washing the second non-magnetic material, the washed material may be thrown into the kiln bottom of the cement kiln. Moreover, the mill waste discharged from the roller mill may be physically sorted to increase the purity of the precious metal.

EXAMPLES The embodiments of the present invention will now be described more specifically with reference to Examples. However, the present invention is not limited to the following examples.

Example As a raw material (target sample) to be treated, 100 kg of municipal waste incineration bottom ash was prepared.
Municipal waste incineration bottom ash was pretreated by crushing it with an impact crusher, removing coarse magnetic metals with a hanging magnetic separator, then removing coarse metals above 20 mm with a sieve, and washing and dehydrating the bottom ash with a drum-type washer.
Next, the dehydrated matter was processed using a vibrating sieve with an opening of 5 mm and 0.5 mm, and classified into three grain groups of 5 mm above, 0.5-5 mm and 0.5 mm below. Of this, the 0.5 mm below the sieve was sent to a stirring tank, washed, and then dehydrated with a filter cloth dehydrator.

Samples of each grain group were evaluated for odor index, dioxin toxicity equivalence, and metal partition ratio during drying.
The odor during drying was measured for 5 minutes by inserting an odor sensor (Neo Sigma manufactured by Carmore Co.) into the container at predetermined time intervals by placing 100 g of a sample in a 1 L closed container and heating at 105°C. The odor sensor can calculate the odor index from the sensor display value as a conversion value by creating a calibration curve that correlates the sensor display value and the odor index data evaluated in advance by the three-point odor bag method.
The dioxin toxicity equivalent amount is the result of evaluating the dioxin toxicity equivalent amount in the solid of each particle group sample according to the "simple measurement method manual" established in March 2010 by the Ministry of the Environment.
The metal distribution ratio is obtained by evaluating the distribution from the evaluation results of the weight ratio and metal concentration of each particle group. In addition, the analysis of the metal component was performed by the method shown in Table 1.
These evaluation results are shown in Table 2.

From Table 2, the following findings were obtained.
From the analysis result of the metal distribution ratio, there is little precious metal in grain groups of less than 0.5 mm, and most of the precious metal is distributed in grain groups of 0.5 mm or more.
From the results of the odor measurement, the grain group with a high odor index contains less precious metal, and most of the precious metal is distributed in the grain group with an odor index of less than 30.
From the result of the dioxin toxicity equivalence, the grain group with high dioxin toxicity equivalency contains less precious metal, and most of the precious metal is distributed to the grain group with dioxin toxicity equivalency of less than 0.01 ng-TEQ/g.
From the above results, the noble metal concentration is correlated with each of the particle size, odor index, and dioxin toxicity equivalent, and it can be seen that the precious metal can be efficiently recovered from the incineration ash by fractionating the first non-magnetic substance with one or more selected from the particle size, odor index, and dioxin toxicity equivalent as an index.

Next, regarding the grain group (second non-magnetic substance), which is a fine grain 0.5 mm below, assuming that it will be thrown into the bottom of the kiln, the odor when heat-treated at 800 ° C. and the dioxin toxicity equivalent when heat-treated at 1200 ° C. were evaluated. The odor was measured by raising the temperature of the tubular furnace to 800° C., then pumping the gas generated during drying at 105° C. into the tubular furnace, collecting it in a polyester bag, and analyzing it with an odor sensor. As a result of the analysis, the odor index was 25, which was less than when dried at 105°C, confirming that the odorant was decomposed by heating.
In addition, the dioxin toxicity equivalent in the sample after heat treatment at 1200° C. was less than 0.01 ng-TEQ/g, and since the dioxin toxicity equivalent was reduced, it was confirmed that dioxin was decomposed by heating. It was also confirmed that there was no scattering due to heating.
From the above results, it can be seen that the second non-magnetic material can be put into the bottom of the kiln so that dioxins and odorous substances are decomposed by high-temperature treatment without scattering, so that incineration ash containing dioxins and odors can be processed smoothly without causing adverse effects due to dioxins and odors even while using cement manufacturing equipment, and can be effectively used as a part of raw materials for cement manufacturing.

Claims (8)

A method for recovering precious metals from incineration ash using a cement manufacturing facility having a roller mill for pulverizing a cement raw material containing one or more selected from limestone and silica stone, a preheater for preheating the ground cement raw material introduced from the roller mill, and a cement kiln for firing the ground cement raw material introduced from the preheater,
an incineration ash pretreatment step of crushing incineration ash, subjecting the crushed material to magnetic separation to recover non-magnetic substances, and separating the non-magnetic substances into first non-magnetic substances and second non-magnetic substances based on the physical or chemical properties of the non-magnetic substances;
A cement raw material pulverizing step of pulverizing the first non-magnetic substance together with the cement raw material with a roller mill to separate it into mill waste stone and mill refined powder,
Collecting mill waste stones,
A method for recovering precious metals from incineration ash using cement manufacturing equipment. A method for treating incinerated ash using a cement production facility having a roller mill for pulverizing a cement raw material containing one or more selected from limestone and silica stone, a preheater for preheating the ground cement raw material introduced from the roller mill, and a cement kiln for firing the ground cement raw material introduced from the preheater,
An incineration ash treatment step of crushing incineration ash, subjecting the crushed material to magnetic separation to recover non-magnetic substances, and separating the non-magnetic substances into first non-magnetic substances and second non-magnetic substances based on the physical or chemical properties of the non-magnetic substances;
a cement raw material pulverizing step of pulverizing the first non-magnetic substance together with the cement raw material in a roller mill to separate the mill waste stone and mill refined powder;
A method for treating incineration ash using cement production equipment, including a cement firing step of putting mill powder into a preheater and putting a second non-magnetic substance into the kiln bottom of a cement kiln. 3. The precious metal recovery method or treatment method according to claim 1, wherein in the incineration ash treatment step, the non-magnetic substances are separated into first non-magnetic substances and second non-magnetic substances based on the particle size of the non-magnetic substances. 4. The precious metal recovery or processing method according to claim 3, wherein the grain size of the first non-magnetic substance is 0.1 mm or more and the grain size of the second non-magnetic substance is less than 0.1 mm. The precious metal recovery method or treatment method according to any one of claims 1 to 3, wherein in the incineration ash treatment step, the non-magnetic substances are separated into the first non-magnetic substances and the second non-magnetic substances based on the odor index of the non-magnetic substances. 6. The precious metal recovery method or processing method according to claim 5, wherein the first non-magnetic substance has an odor index of less than 30 and the second non-magnetic substance has an odor index of 30 or more. 4. The precious metal recovery method or treatment method according to any one of claims 1 to 3, wherein in the incinerated ash treatment step, the non-magnetic substances are separated into the first non-magnetic substances and the second non-magnetic substances based on the dioxin toxicity equivalent of the non-magnetic substances. 8. The precious metal recovery method or treatment method according to claim 7, wherein the first non-magnetic object has a dioxin toxicity equivalent of less than 0.01 ng-TEQ/g and the second non-magnetic object has a dioxin toxicity equivalent of 0.01 ng-TEQ/g or more.