How recycled materials are processed

Abstract

To provide a method for treating a recycled raw material, which allows processing of as much recycled raw material as possible in a non-ferrous smelting furnace while minimizing the use of auxiliary fuel.SOLUTION: This method for treating recycled raw material is for processing, in a non-ferrous smelting furnace, a recycled raw material together with a smelting raw material containing at least one of a non-ferrous metal ore and a non-ferrous metal matte. When the recycled raw material is subjected to incineration treatment as a pretreatment, the calorific value of the recycled raw material after the incineration treatment is controlled to fall within a predetermined range of calorific value such that the oxidation heat of the smelting raw material does not become insufficient in the heat balance of the non-ferrous smelting furnace.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This case relates to a method for processing recycled materials. [Background technology]

[0002] Conventionally, recycled raw materials containing impurities including organic matter, such as substrates containing resin materials, are incinerated as a pretreatment to reduce the volume before being processed in a non-ferrous smelting furnace, and then fed into the non-ferrous smelting furnace (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-222288 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] Recycled raw materials are melted in a non-ferrous smelting furnace, and valuable metals contained in the recycled raw materials are recovered by dissolving them into matte. Because recycled raw materials contain organic matter, such as resin-based substrates, they also function as fuel components. This reduces the use of auxiliary fuels, such as heavy oil. However, recycled raw materials are incinerated as a pretreatment for volume reduction before being placed in the non-ferrous smelting furnace. During the incineration process, fuel components are burned during incineration, which may require thermal compensation in the non-ferrous smelting furnace.

[0005] In view of the above, an object of the present invention is to provide a method for processing recycled materials that can process as many recycled materials as possible in a non-ferrous smelting furnace while minimizing the use of auxiliary fuel. [Means for solving the problem]

[0006] The method for processing recycled materials according to the present invention is a method for processing recycled materials in a non-ferrous smelting furnace together with smelting raw materials containing at least one of non-ferrous metal ore and non-ferrous metal matte, and is characterized in that when the recycled materials are incinerated as pre-treatment, the calorific value of the recycled materials after the incineration treatment is controlled to be within a predetermined calorific value range so that the heat of oxidation of the smelting raw materials is not insufficient in the heat balance of the non-ferrous smelting furnace.

[0007] The furnace for the incineration treatment may be a kiln furnace, a stoker furnace, or a kiln-stoker furnace. The correlation between the air ratio calculated by dividing the air intake amount of the kiln-stoker furnace by the amount of air required to completely incinerate the carbon and hydrogen of the recycled material charged into the kiln-stoker furnace and the calorific value of the recycled material after incineration at that air ratio may be determined, and the air intake amount of the kiln-stoker furnace may be adjusted based on the correlation in the graph to adjust the required calorific value of the recycled material after incineration. In the kiln stoker furnace, a correlation 1 between the air ratio calculated by dividing the air intake volume of the kiln furnace by the amount of air required to completely incinerate the carbon and hydrogen in the recycled material charged into the kiln stoker furnace and the calorific value of the recycled material after incineration at that air ratio is calculated, and a correlation 2 between the air ratio calculated by dividing the air intake volume of the stoker furnace by the amount of air required to completely incinerate the carbon and hydrogen in the recycled material charged into the kiln stoker furnace and the calorific value of the recycled material after incineration at that air ratio is calculated, and the correlation 1 and correlation 2 are compared to determine the furnace with the largest change in the calorific value of the recycled material after incineration with respect to the air ratio, and the air ratio of the determined furnace may be given priority.When the recycled material is incinerated in the kiln stoker furnace, the inlet temperature of the kiln furnace may be controlled to 750°C or less, and the outlet temperature of the kiln furnace may be controlled to 1000°C or less. In order to control the inlet temperature of the kiln furnace to 750°C or less, at least one of the amount of water sprayed on the recycled material, the amount of air supplied to the kiln stoker furnace, the rate at which the recycled material is fed to the kiln stoker furnace, and the rotation speed of the kiln furnace may be adjusted.In order to control the outlet temperature of the kiln furnace to 1000°C or less, at least one of the amount of water sprayed on the recycled material, the amount of air supplied to the kiln stoker furnace, the rate at which the recycled material is fed to the kiln stoker furnace, and the rotation speed of the kiln furnace may be adjusted.In the stoker furnace of the kiln stoker furnace, an operation may be performed to adjust the temperature of the grate so that it is below the heat-resistant temperature of the grate.The non-ferrous metal may be copper, and the non-ferrous smelting furnace may be a copper smelting furnace. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a method for processing recycled materials that can process as many recycled materials as possible in a non-ferrous smelting furnace while minimizing the use of auxiliary fuel. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing a schematic configuration of a flash furnace for copper smelting. [Figure 2] (a) is a schematic diagram of an incinerator used in a method for processing recycled materials, and (b) is a side view of the head of a rotary kiln. [Figure 3] FIG. 10 is a diagram illustrating calorie calculations. [Figure 4] FIG. 10 is a diagram illustrating calorie calculations. [Figure 5] FIG. 1 is a diagram illustrating the relationship between the calorific value of recycled materials after incineration and the air ratio. [Figure 6] FIG. 1 is a diagram illustrating the relationship between the calorific value of recycled materials after incineration and the air ratio. [Figure 7] FIG. 1 is a diagram illustrating the relationship between the calorific value of recycled materials after incineration and the air ratio. [Figure 8] FIG. 1 is a diagram illustrating the relationship between the calorific value of recycled materials after incineration and the air ratio. [Figure 9] FIG. 1 is a diagram illustrating the relationship between the calorific value of recycled materials after incineration and the air ratio. [Figure 10] This shows the relationship between the predicted and measured values ​​of the calories of recycled materials after incineration. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment for carrying out the present invention will be described.

[0011] (Embodiment) FIG. 1 is a diagram showing the schematic configuration of a flash smelting furnace 100 for copper smelting, as an example of a non-ferrous smelting furnace. As shown in FIG. 1, the flash smelting furnace 100 includes a reaction shaft 1 in which smelting raw materials, recycled raw materials, and reaction gas are mixed, a settler 2, and an uptake 3. A concentrate burner 4 is provided on the ceiling of the reaction shaft 1. The concentrate burner 4 mixes the smelting raw materials, recycled raw materials, and reaction gas and feeds them into the reaction shaft 1. The reaction gas is air or oxygen-enriched air.

[0012] The smelting raw material contains copper concentrate such as CuFeS2 and silica ore as a solvent. In this case, when the smelting raw material is fed into the reaction shaft 1 from the concentrate burner 4, the copper concentrate undergoes an oxidation reaction according to the following reaction formula (1), and is separated into matte 5 and slag 6 at the bottom of the reaction shaft 1, as shown in Figure 1. In the following reaction formula (1), Cu2S·FeS corresponds to the main component of matte 5, and FeO·SiO2 corresponds to the main component of slag 6. CuFeS2+SiO2+O2→Cu2S·FeS+FeO·SiO2+SO2+ Reaction heat (1)

[0013] Furthermore, smelting raw materials contain repeat materials such as flue dust, slag, and precipitates such as copper slag obtained by neutralizing wastewater containing Cu. The calorific value of these repeat materials is very low or endothermic. Alternatively, heat may be required to melt the repeat materials. Therefore, if the amount of repeat materials contained in the smelting raw materials is high, more heat may be required than usual to melt the smelting raw materials. Furthermore, the calorific value derived from copper concentrate may fluctuate depending on the S / Cu ratio contained in the copper concentrate.

[0014] If the heat output in the reaction shaft 1 is insufficient, auxiliary fuel such as heavy oil may be used to compensate for the heat. However, it is desirable to minimize the amount of auxiliary fuel used. Auxiliary fuel refers to fuel components other than recycled raw materials.

[0015] The recycled raw materials are melted in reaction shaft 1, and the valuable metals contained in the recycled raw materials are recovered by dissolving them into matte 5. Because the recycled raw materials contain organic matter such as resin-based substrates, they also serve as fuel components in reaction shaft 1. Therefore, by feeding the recycled raw materials into reaction shaft 1 together with the smelting raw materials, it is possible to reduce the use of auxiliary fuels such as heavy oil.

[0016] However, recycled materials are incinerated as a pretreatment for volume reduction before being fed into the reaction shaft 1. In this incineration process, fuel components are burned during the incineration process. Therefore, if too much recycled material is burned during the incineration process, the amount of fuel components in the reaction shaft 1 may become insufficient, and thermal compensation may be required.

[0017] In future non-ferrous smelting, it is expected that the ratio of recycled raw materials fed into the flash smelting furnace 100 will increase. As the ratio of recycled raw materials increases, the amount of fuel components contained in the recycled raw materials will have a greater effect on the heat balance in the reaction shaft 1. Therefore, it will become important to manage the amount of components contained in the recycled raw materials.

[0018] Therefore, in this embodiment, a method for processing recycled materials will be described that can process as many recycled materials as possible in a non-ferrous smelting furnace while minimizing the use of auxiliary fuel.

[0019] First, we will explain the heat balance in the flash smelting furnace 100. The amount of heat required to turn the smelting raw material containing copper concentrate and flux into matte can be calculated as follows.

[0020] During steady-state operation, the heat balance in the furnace is balanced between the total heat generated by the oxidation reaction of the ore charged from the concentrate burner 4 and the heat generated by the oxidation of the carbonaceous material added for the combustion of heavy oil in the concentrate burner 4 and for slag reduction, the heat generated by the matte, slag, exhaust gas, and ash generated by the reaction of the charged materials in the furnace and discharged from the flash furnace, and the total heat output, which is the sum of the heat generated by the heat dissipated from the furnace body.

[0021] The calorific value of the oxidation reaction of the charge ore varies depending on the composition of the charge ore. Charge ore often contains copper concentrate, solvents such as silica ore, recycled materials, and reusable materials from the smelter, such as neutralization slag and dust. The recycled materials have a higher copper content than copper concentrate, but a lower calorific value. For example, even if the same amount of copper is processed in a flash smelting furnace, increasing the ratio of recycled materials to copper concentrate results in a decrease in the total calorific value of the flash smelting furnace. As a result, to balance the total calorific value, it becomes necessary to burn fuels such as heavy oil in the concentrate burner 4 to compensate for the calorific value. Furthermore, recycled materials often contain halogen elements and hydrocarbons, such as resins, and are incinerated, so the calorific value of the recycled materials varies depending on the degree of incineration.

[0022] In this embodiment, when the recycled materials are incinerated as pretreatment, the calorific value of the recycled materials after incineration is controlled to be within a predetermined range so that the heat of oxidation of the smelting materials is not insufficient as a heat balance in the reaction shaft 1. This makes it possible to process as much recycled material as possible in the non-ferrous smelting furnace while minimizing the use of auxiliary fuel.

[0023] Figure 2(a) is a schematic diagram of an incinerator 200 used in the method for processing recycled materials. Figure 2(b) is a side view of the mirror section 12 of a rotary kiln 10, which will be described later. As illustrated in Figure 2(a), the incinerator 200 generally has a configuration in which a rotary kiln 10, which is a first combustion furnace, and a stoker furnace 20, which is a second combustion furnace, are connected to each other.

[0024] The rotary kiln 10 includes a horizontally placed cylindrical kiln furnace 11. As illustrated in FIG. 2(b), a feed inlet 14 for feeding recycled materials is provided in the head section 12 at one end of the kiln furnace 11. A kiln burner 13 is also provided near the feed inlet 14. The kiln burner 13 burns fuel, such as heavy oil or recycled fuel, and blows flames into the kiln furnace 11, thereby incinerating the recycled materials. Multiple (e.g., three) air supply inlets 15 are provided above the feed inlet 14. Multiple (e.g., three) air supply inlets 16 are provided below the feed inlet 14. Because gasification by pyrolysis of hydrocarbon-containing components, such as resins, in the recycled materials proceeds continuously, the kiln burner 13 does not need to be used all the time; operation can be performed by supplying air through the air supply inlets 15. However, if the temperature inside the furnace drops, the kiln burner 13 is ignited to maintain a high temperature inside the furnace. The air intake volume from the kiln furnace 11, described below, includes not only the air supplied through the air supply port 15 but also the air supplied via the kiln burner 13 when the kiln burner 13 is not ignited. The air supplied to burn fuel in the kiln burner 13 does not need to be included in the air intake volume, but it may be included when it cannot be distinguished from the air volume from the air supply port 15 or to simplify the calculation of the air intake volume. The other end of the kiln furnace 11 is connected to a stoker furnace 20. The kiln furnace 11 is positioned so as to tilt slightly downward toward the stoker furnace 20 and is rotatable by a motor (not shown). The rotation axis coincides with the cylindrical axis of the cylindrical kiln furnace 11. The recycled material in the rotary kiln 10 gradually moves and is discharged into the stoker furnace 20.

[0025] The stoker furnace 20 has a grate section 22 below the connection point with the rotary kiln 10. The recycled materials discharged from the rotary kiln 10 fall onto the grate section 22. The grate section 22 has a fixed grate and a movable grate that are arranged in a staggered manner. The movement of the movable grate causes the recycled materials to move forward, and air is introduced from below to further combust the recycled materials. Note that the amount of air introduced into the stoker furnace, which will be described later, refers to the amount of air introduced from below the grate section 22.

[0026] The secondary combustion furnace introduces air into the combustible gases generated in the kiln furnace 11 and stoker furnace 20 through a secondary combustion furnace air inlet, completely combusting them until they become water and carbon dioxide, and thermally decomposing dioxins. When the temperature inside the secondary combustion furnace is low, complete combustion and dioxin decomposition are insufficient. Therefore, a secondary combustion burner 21, located above the connection point with the rotary kiln 10, must be used to burn fuel such as heavy oil or recycled fuel, producing a flame to raise the temperature inside the secondary combustion furnace. Technical standards for incineration facilities under the Waste Management and Public Cleansing Act stipulate that thermal decomposition of dioxins requires a temperature of 800°C or higher with a gas residence time of 2 seconds or more, and therefore the temperature inside the secondary combustion furnace must be 800°C or higher.

[0027] In this embodiment, the target recycled materials are valuable materials as shown in Table 1. These include precious metal scraps generated from products and industries using electronic components, as well as industrial waste such as scrap electrical appliances, automobile scrap residue (ASR), and scrap metal. For example, the target recycled materials are precious metal scraps as shown in Table 1. [Table 1]

[0028] In this incinerator 200, the heat balance in the reaction shaft 1 is controlled so that the heat generated by the oxidation of the smelting raw materials is not insufficient, and the calorific value of the recycled raw materials after incineration is kept within a predetermined range.

[0029] For example, using the concept of air ratio calculated using the calculation method described below, the correlation between the air ratio calculated from the total air intake rate of the kiln furnace and the stoker furnace and the calorific value of the recycled material after incineration at that air ratio can be determined, and the required calorific value of the recycled material after incineration can be adjusted based on the correlation in this graph.Furthermore, a method can be considered in which the correlation between the air ratio of the kiln furnace and the calorific value of the recycled material after incineration and the correlation between the air ratio of the stoker furnace and the calorific value of the recycled material after incineration are determined separately, and the air intake rate of the furnace with the largest change in calorific value relative to the air intake rate is adjusted preferentially, and the air intake rate of the other furnace is changed depending on the required total air ratio.

[0030] The air ratio can be measured as follows. First, at least two samples of typical recycled materials expected to be processed in the kiln furnace 11 are prepared, and the calorific value and the C (carbon) and H (hydrogen) contents are analyzed. Then, based on this data, the C and H contents are calculated based on the calorific value of the recycled materials for which the correlation is to be determined. A specific example will be described below.

[0031] As an example, prepare ingredients of 3,800 kcal and 2,000 kcal. Assuming that C and H are independent of each other, calculate the calorie relationship of C and the calorie relationship of H independently. For example, the calorie relationship of C can be expressed as in the following equations (2) and (3). Note that a represents the slope and b represents the intercept. As shown in the example in Figure 3, calculate the slope a and intercept b from the following equations, and assume that the other calories are on the linear function above. 3,800=C grade (31.75mass%)×a+b (2) 2,000=C grade (20.27mass%)×a+b (3) From the above calculations, the following equation (4) is obtained to estimate the carbon content in recycled materials by measuring the calories of the recycled materials. C quality (mass%) = (recycled material calories (kcal) - b) / a (4)

[0032] Next, the relationship between calories and H can be expressed as the following equations (5) and (6). Note that a' represents the slope and b' represents the intercept. As shown in Figure 4, the slope a' and intercept b' are calculated from the following equations, and it is assumed that the other calories are on the above linear function. 3,800=H grade (2.22mass%)×a´+b´ (5) 2,000=H quality (1.42mass%)×a´+b´ (6) From the above calculations, the following equation (7) is obtained to estimate the H content in the recycled material by measuring the recycled material calories. H quality (mass%) = (recycled material calories (kcal) - b´) / a´ (7)

[0033] Next, we move on to the step of determining the relationship between the calorific value of recycled materials after incineration and the air ratio. First, the calorific value of recycled materials to be processed in the heat treatment furnaces of the kiln furnace 11, stoker furnace 20, and incinerator 200 is measured. Then, the C and H grades of the recycled materials whose calorific values ​​have been measured are estimated using the regression equations (4) and (7) above. Note that when determining the above relationship using three or more representative samples, the Y-axis is plotted as calories and the X-axis as the grade of C or H, and a linear regression equation can be determined. The air ratio is determined from the total air volume (with an air ratio of 1) determined from the estimated grade and the actual air volume. Note that the air ratio is determined by estimating the C and H content from the raw material calories, and the air volume when all C and H are burned is set to an air ratio of 1. Next, the relationship between the calorific value of recycled materials after incineration and the air ratio is determined, as shown in Figures 5 to 10. A multiple regression analysis was performed using the variables calories of recycled material after incineration, kiln air ratio, and stoker air ratio from the results of Figures 5 and 6. As a result, the following relationship was obtained: calories of recycled material after incineration = -334 × kiln air ratio - 693 × stoker air ratio + 1442.

[0034] Figures 8 and 9 show the data from Figures 5 and 6 to which the data for the calories of recycled materials after incineration obtained using this relational expression has been added as predicted values. Figure 10 also shows the relationship between the predicted values ​​for the calories of recycled materials after incineration obtained using this relational expression and the actual measured values. Figure 10 indicates that the closer the approximation line is to a 45° angle, the more accurate this relational expression is. Thus, the predicted values ​​obtained using this relational expression are not significantly different from the actual measured values, and it has been confirmed that they are reasonably valid. Using this relational expression, it is possible to determine the air ratio during kiln stoker furnace operation that will keep the calories of the recycled materials after incineration within a specified range, based on the calories of the recycled materials introduced into the kiln stoker furnace. In this example, the kiln air ratio and stoker air ratio are used as separate variables to obtain the relationship equation. Alternatively, as shown in Figure 7, multiple regression analysis can be performed using the air ratio calculated from the total air intake volume of the kiln-stoker furnace and the data on the calories of recycled materials after incineration as variables to create a relationship equation such as calories of recycled materials after incineration = a × (kiln + stoker air ratio) + b (where a and b are constants).

[0035] For example, if the raw material calorie is 3031 kcal / kg, C is 26.91% and H is 1.88%. Since the processing rate is 6 t / h, C in the raw material is 26.91% x 6 t / h and H is 1.88% x 6 t / h, and the total amount of air required is 17,356 Nm 3 For example, if the flow rate is 8,000 Nm / h from the bottom of the stoker furnace 20, 3 / h of air is introduced, the air ratio below the stoker furnace 20 is 8000 / 17356=0.46.

[0036] In addition, it is preferable to adjust the temperature of the grate in the stoker furnace 20 so that it is below the heat-resistant temperature of the grate. If this operation causes the temperature to exceed the heat-resistant temperature of the grate, there is a risk of thermal deformation, so it is preferable to operate it below the heat-resistant temperature. The temperature may be adjusted by adjusting at least one of the amount of stoker air and the amount of ore fed.

[0037] Furthermore, when incinerating recycled materials in the incinerator 200, if a large amount of unincinerated material is used, there is a risk of localized overheating within the reaction shaft 1, which could cause partial wear, halogens could cause corrosion of the smelting equipment, and hydrocarbons could cause the sulfuric acid produced in the smelting process to become discolored. Therefore, it is preferable to set an upper limit on the incineration loss when incinerating recycled materials in the incinerator 200. For example, it is preferable to set the incineration loss to 10% or less.

[0038] If the outlet temperature of the kiln furnace 11 is high, abnormal growth of deposits may prevent the movable grate of the grate portion 22 of the stoker furnace 20 from moving forward. Therefore, when incinerating recycled materials in the incinerator 200, it is preferable to control the outlet temperature of the kiln furnace 11 to 1000°C or less. On the other hand, if the outlet temperature of the kiln furnace 11 is too low, dioxin decomposition may be insufficient. Therefore, it is preferable to control the outlet temperature of the kiln furnace 11 to 800°C or more. The outlet temperature of the kiln furnace 11 refers to the temperature of the atmosphere at the outlet of the kiln furnace 11.

[0039] For example, the outlet temperature of the kiln furnace 11 can be controlled by adjusting the amount of water sprayed on the recycled materials before they are fed into the incinerator 200, the amount of air supplied into the incinerator 200, the rate at which the recycled materials are fed into the incinerator 200, the rotation speed of the kiln furnace 11, etc.

[0040] Furthermore, if the inlet temperature of the kiln furnace 11 is high, the melting of the metal inside the kiln furnace 11 may progress, resulting in the discharge of a large amount of metal lumps. Therefore, it is preferable to control the inlet temperature of the kiln furnace 11 at 750°C or less. On the other hand, if the inlet temperature of the kiln furnace 11 is too low, combustion may be insufficient. Therefore, it is preferable to control the inlet temperature of the kiln furnace 11 at 500°C or more. The inlet temperature of the kiln furnace 11 refers to the temperature of the atmosphere at the inlet of the kiln furnace 11.

[0041] For example, the inlet temperature of the kiln furnace 11 can be controlled by adjusting the amount of water sprayed on the recycled materials before they are fed into the incinerator 200, the amount of air supplied into the incinerator 200, the rate at which the recycled materials are fed into the incinerator 200, the rotation speed of the kiln furnace 11, etc.

[0042] The present invention is more effective when the weight ratio of the recycled raw materials is large among the smelting raw materials and recycled raw materials fed into the reaction shaft 1. Specifically, the ratio of metallic Cu in the recycled raw materials to the total combined weight of the smelting raw materials and recycled raw materials is expected to be 6.0 mass% or more and 28.0 mass% or less, or 9.0 mass% or more and 18.0 mass% or less, or 9.0 mass% or more and 12.0 mass% or less.

[0043] In the above embodiment, a flash smelting furnace for processing non-ferrous metal ores has been described as an example of a non-ferrous smelting furnace, but the above embodiment can also be applied to a smelting furnace for processing non-ferrous metal matte, such as a converter for copper smelting.

[0044] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments or examples, and various modifications and variations are possible within the scope of the gist of the present invention as set forth in the claims. For example, in the above embodiment, a kiln-stoker furnace is used as the furnace for incineration treatment, but a kiln furnace or a stoker furnace may also be used. [Explanation of symbols]

[0045] 1 Reaction Shaft 2 Setra 3 Uptake 4 Concentrate burner 5. Matt 6. Slug 10 Rotary Kiln 11 Kiln 12 Mirror section 13 Kilnburner 14 Inlet 15 Air supply port 16 Air supply port 20 Stoker furnace 21 Secondary combustion burner 22 Lattice section 100 Flash furnace 200 Incinerator

Claims

1. A method for treating recycled raw materials for processing in a non-ferrous smelting furnace together with smelting raw materials containing at least one of non-ferrous metal ore and non-ferrous metal matte, comprising: determining a correlation between the calorific value and the carbon and hydrogen contents from a sample of the recycled material, and estimating the carbon grade and hydrogen grade of the recycled material from the correlation and a measured value of the calorific value of the recycled material to be treated in an incinerator; A method for processing recycled materials, characterized by using the estimated carbon grade and hydrogen grade to determine a correlation between the air ratio calculated by dividing the amount of air introduced into the incinerator by the amount of air required to combust all of the carbon and hydrogen in the recycled material charged to the incinerator and the calorific value of the recycled material after incineration at that air ratio, and adjusting the amount of air introduced into the incinerator based on the correlation to adjust the calorific value of the recycled material after incineration as needed.

2. A method for processing recycled raw materials as described in claim 1, characterized in that a kiln furnace, a stoker furnace, or a kiln-stoker furnace is used as the incinerator.

3. A kiln stoker furnace is used as the incinerator, In the kiln stoker furnace, The correlation 1 between the air ratio calculated by dividing the amount of air introduced into the kiln furnace by the amount of air required to completely incinerate the carbon and hydrogen of the recycled material charged into the kiln stoker furnace and the calorific value of the recycled material after incineration treatment at that air ratio is calculated; The air ratio is calculated by dividing the amount of air introduced into the stoker furnace by the amount of air required to completely incinerate the carbon and hydrogen of the recycled material charged into the kiln stoker furnace, and a correlation 2 is calculated between the air ratio and the calorific value of the recycled material after incineration treatment at that air ratio; By comparing correlation 1 and correlation 2, the furnace with the larger change in the calorific value of the recycled raw material after incineration versus the air ratio is determined.

3. The method for processing recycled materials according to claim 2, wherein the determined air ratio of the furnace is determined with priority.

4. A kiln stoker furnace is used as the incinerator, The method for processing recycled materials according to claim 2, characterized in that, when the recycled materials are incinerated in the kiln stoker furnace, the inlet temperature of the kiln furnace is controlled to 750°C or less, and the outlet temperature of the kiln furnace is controlled to 1000°C or less.

5. 5. The method for processing recycled materials according to claim 4, characterized in that at least one of the amount of water sprayed on the recycled materials, the amount of air supplied to the kiln stoker furnace, the charging rate of the recycled materials to the kiln stoker furnace, and the rotation speed of the kiln furnace is adjusted to control the inlet temperature of the kiln furnace to 750°C or less.

6. 5. The method for processing recycled materials according to claim 4, characterized in that at least one of the amount of water sprayed on the recycled materials, the amount of air supplied to the kiln stoker furnace, the charging rate of the recycled materials to the kiln stoker furnace, and the rotation speed of the kiln furnace is adjusted to control the outlet temperature of the kiln furnace to 1000°C or less.

7. 5. The method for processing recycled materials according to claim 4, wherein the temperature of the grate in the stoker furnace of the kiln stoker furnace is adjusted to be lower than the heat-resistant temperature of the grate.

8. 2. The method for treating recycled materials according to claim 1, wherein the non-ferrous metal is copper, and the non-ferrous smelting furnace is a copper smelting furnace.

Images