TWI844867B - Process for treatment of fly ash generated from melting furnace - Google Patents

Abstract

The present invention relates to a process for treatment of fly ash generated from a melting furnace, which includes collection of fly ash containing hazardous substances generated in a course of waste incineration, burning or processing in production industries, removal of those hazardous substances from the fly ash by a liquid scrubbing treatment to obtain an intermediate product, placing the intermediate product into a high-temperature melting furnace for melting at a high temperature, and finally cooling the intermediate product to obtain a finished product. Accordingly, with the aforesaid liquid scrubbing treatment, a concentration of the hazardous substances in the fly ash can be effectively lowered as concurrently as the intermediate product after being subject to the liquid scrubbing treatment will neither corrode the furnace nor result in pipe blockage in the melting process since most of hazardous substances thereof, such as acidic matters and alkaline matters, have been substantially removed to meet available standards of hazardous air pollutant emissions. In such a case, this invention can significantly achieve multiple effects and purposes for volume reduction and recycling of various wastes, safeguarding and properly maintaining the melting furnace for much longer service lifetime thereof.

Description

Fly ash treatment method for smelting furnace

The present invention relates to a fly ash treatment method applied to a melting furnace, and more particularly to a resource recovery and reuse technology for decontaminating and remelting fly ash containing harmful substances.

According to the law, waste will be generated in the operation of various industries. The treatment method of these wastes is generally combustion. The garbage and waste handled by the incineration plant are divided into combustible garbage and non-combustible garbage according to their physical components. The incinerator is incinerated at a temperature of 850℃~1000℃. The bottom ash is discharged from the furnace to the ash discharger. After being cooled by water, it is continuously discharged to the conveyor by a mechanical device and stored in the bottom ash storage pit. Incineration fly ash mainly refers to the fine particles that are carried out from the combustion chamber with the exhaust gas and captured by the dust collection equipment. Precipitator Ash or Fly Ash is the fine particles or granular matter captured by the air pollution control equipment of the incineration plant. Its main components are heavy metals and inorganic substances after combustion.

After the incineration of garbage and waste, about 15% of bottom ash and 3% of fly ash will remain, becoming a new waste disposal problem; Taiwan's incinerators process about 6.5 million tons of waste each year. After the garbage is burned, there are still about 900,000 tons of bottom ash and 200,000 tons of fly ash. Fly ash mostly relies on landfill treatment, while bottom ash can be processed into "recycled aggregate" as a foundation, road filling or cement product blending ingredient. Fly ash is solidified with cement before being buried, but solidification and landfill treatment has the dangers and disadvantages of consuming landfill space and easily dissolving harmful substances, which will cause secondary pollution to the environment.

Further discussion of the harmful substances (chlorine ions) contained in fly ash, the Soil Investigation and Testing Center conducted a chlorine ion (Cl) concentration test and analysis, and the content in fly ash was 4.44%; the content in reaction ash was 31.4%. The reason for the different chlorine ion concentrations of the two is that after the incineration of urban garbage, about 85% of the chlorine salts are in the gas discharged from the furnace or collected by the bag filter dust collector of the secondary pollution prevention equipment, and the rest are distributed in the bottom ash, so the chlorine ion concentration in the reaction ash is higher. The main source of chlorine salts is the excessive number of plastic products on the market. Chlorine salts have the characteristics of not being affected by high temperatures and cannot be removed or destroyed through incineration. Instead, they accumulate on the surface of ash due to concentration. Because incineration is an intermediate treatment, it must eventually be solidified and buried. During this process, the chloride salts contained in the ash will dissolve in the water and flow out with the seepage water. When reused, high chloride salts can easily cause the steel structure to be unstable and corroded. In addition, chloride salts can easily combine with heavy metals, increasing the difficulty of treatment. Therefore, if chloride salts are not properly handled, they may cause secondary pollution.

Therefore, the inventor has carried out research and development to address the above issues with the rich experience and knowledge gained from many years of relevant industries. The inventor has previously introduced high-end melting furnace technology to process products in different industries, and has protected these carefully developed related technologies through patent layout. These professional technologies have been strictly reviewed by domestic and foreign patent agencies and have won awards. It is believed that the melting furnace technology developed by the inventor has been recognized both at home and abroad, and these related technologies are:

(1) Patents No. I680259, “Method for Reducing Volume of Biological Ashes and Long-term Preservation thereof” and No. I695955, “Method for Reducing Volume of Biological Remains”, allow biological remains to be directly melted at high temperature in a melting furnace into a high-density, small-volume solid. In addition to effectively achieving the function of volume reduction, it can also solve the problem of insufficient space in bone towers. Moreover, these solids are stable and strong, and have the function of long-term commemorative value when preserved in personal collections.

(2) Invention patents No. I680790 “Method for producing water filter material” and No. I685373 “Method for producing water filter material (I)” are about putting composite materials such as rocks, soil, ores, powders, or fly ash into a high-temperature melting furnace, melting them at high temperatures, and turning the composite materials into liquid slurry. The slurry is cooled to obtain a porous water filter material. The obtained water filter material can retain the characteristics of absorbing pollutants and releasing trace elements.

(3) Invention patent No. I701214, “Method for preparing biochar generated by high temperature”, involves placing biomass raw materials such as agricultural waste, trees, plants or biochar into a high temperature melting furnace, where they are melted at high temperature to form a liquid slurry. The slurry is then cooled to obtain a porous biochar filter. The obtained biochar filter can retain the properties of absorbing pollution, improving water quality, air, soil, etc., while reducing the volume of the raw materials.

(4) Patent Publication No. I710344, “A Method for Processing Ashes of Religious Sacrificial Articles and Their Products,” involves placing the ashes of incense sticks, incense rings, incense powder, incense wood or candles, or the ashes of gold paper, into a high-temperature melting furnace. The ashes are melted into liquid slurry by the high temperature, and the slurry is molded and cooled to obtain a product with the function of preservation, blessing and protection. At the same time, the volume of the ashes after the sacrifice can be reduced.

Because the inventor applied his own smelting furnace technology in various industries and received good responses, the inventor promoted the flexible application of smelting furnace technology. Therefore, the inventor introduced the high-end technology of smelting furnace into fly ash treatment, and developed research on traditional deficiencies to provide a fly ash treatment method for smelting furnaces. The fly ash produced by waste incineration can be subsequently treated to obtain non-toxic recyclable materials, achieving the purpose of having better practical value.

The main purpose of the present invention is to provide a fly ash treatment method for use in a smelting furnace, and in particular to provide a resource recovery and reuse technology for decontaminating and remelting fly ash containing pollutants.

The main purpose and effect of the fly ash treatment method of the present invention applied to a smelting furnace are achieved by the following specific technical means:

It mainly collects fly ash containing harmful substances generated by industrial processing, combustion or incineration, removes harmful substances through liquid washing, and obtains an intermediate product. The intermediate product is then put into a high-temperature melting furnace for high-temperature melting, and then cooled to obtain the final product. In this way, the concentration of fly ash containing harmful substances can be reduced through the liquid washing fly ash treatment mechanism. At the same time, since most of the harmful substances such as acidic chlorine ions or part of metal ions or alkaline substances have been removed from the intermediate product after liquid washing, it will not corrode the furnace or cause pipeline blockage during the melting process, and it can also meet air pollution emissions. Therefore, the method of the invention effectively achieves multiple functions such as capacity reduction, recycling and reuse, and safety protection and maintenance of the service life of the melting furnace.

The present invention is applied to a preferred embodiment of a fly ash treatment method of a smelting furnace, wherein the liquid washing treatment comprises at least one liquid washing step, wherein the liquid washing step is to mix the fly ash and liquid according to a fixed ratio, and after stirring and mixing, perform a deliquescence treatment to obtain the intermediate product.

The present invention is applied to a preferred embodiment of a fly ash treatment method for a smelting furnace, wherein the liquid washing treatment includes a first liquid washing step and a second liquid washing step, wherein the fly ash and water are mixed in the first liquid washing step, and after stirring and mixing, a first dehydration is performed to obtain a first intermediate product, and then the first intermediate product is subjected to the second liquid washing step, and in the second liquid washing step, the first intermediate product is mixed with the liquid washing filter separated by the first dehydration, and the liquid washing filter is introduced into the second liquid washing step directly or after water quality treatment to be mixed with the first intermediate product, and then a second dehydration is performed to obtain a second intermediate product, and the liquid washing filter separated by the second dehydration can be introduced back to the first liquid washing step for use, thereby achieving a filter liquid recovery and reuse mechanism.

The preferred embodiment of the fly ash treatment method of the present invention is applied to a smelting furnace, which further includes a shaping step and a storage step. The shaping step is to press and shape the intermediate product into agglomerates or granules, and the storage step is to store and dry the shaped intermediate product to reduce the water content.

The present invention is applied to a preferred embodiment of a fly ash treatment method of a smelting furnace, wherein the smelting furnace is connected to a heat exchanger, one end of the heat exchanger is connected to a blower, and the other end is connected to a feed water preheater. The blower guides external air through the heat exchanger for use in the smelting furnace combustion, and the high-temperature hot air generated by the smelting furnace is processed by the heat exchanger and guided to the feed water preheater, and the feed water preheater is connected to other equipment for their use.

The present invention is applied to a preferred embodiment of a fly ash treatment method of a smelting furnace, wherein the weight ratio of the fly ash to the liquid is in the range of 1:1 to 9.

The present invention is applied to a preferred embodiment of a fly ash treatment method of a melting furnace, wherein the melting furnace is used for melting at a temperature of 900-2000°C.

In order to make the technical content, purpose of the invention and the effects achieved by the present invention more complete and clear, they are described in detail below, and please refer to the disclosed drawings and figure numbers:

First, the actual application technology and means of the present invention are shown in the first figure, which is a schematic diagram of the overall structure of the fly ash treatment method of the present invention applied to the melting furnace, and the steps are:

S1) treating the fly ash with liquid washing (1) to remove harmful substances and obtain an intermediate product (A);

S2) The intermediate product (A) after liquid washing is put into a melting furnace (2) to be melted at high temperature into molten slurry, and the molten slurry is led out and cooled (3) to obtain the final product.

Please refer to the first and second figures. When used in actual operation, the fly ash is mainly raw ash materials such as dust ash, boiler ash, chimney ash, incineration ash and reaction ash generated by industrial processing or domestic waste through combustion or incineration in an incinerator. The acidity and alkalinity of harmful substances generated by these raw ash materials are different due to their different sources. These raw ashes are pre-treated; and the so-called pre-treatment has three implementation states. One is to add pre-additives to these raw ashes. The pre-additives can be divided into chemical additives for neutralizing the acidity and alkalinity, or physical additives for diluting and adjusting the concentration. For example, calcium and sodium are selected. The first is to carry out chemical neutralization, or add chelating agents to reduce and control the physical dilution of metal ion concentration, which can be added and mixed by mixing, spraying, dry, semi-dry or wet methods, and neutralize the acid-base value [such as calcium fly ash, sodium fly ash, etc.]; the second is to wash the raw ashes with water, and the washing treatment is to add water to the raw ashes according to the weight ratio and then dehydrate them to remove some harmful substances; the third is to add pre-additives to the raw ashes and then further wash them with water, and remove some harmful substances through the initial washing [as shown in the second figure]. Therefore, the fly ashes still contain harmful substances or pollutants.

In addition, after obtaining the fly ash, it can be directly subjected to liquid washing treatment (1), or additives can be added to the fly ash. The additives referred to here are the same as the pre-additives, which can be divided into chemical additives for neutralizing the acid-base value, or physical additives for diluting and adjusting the concentration. They are added (neutralized or diluted) according to the acid-base property of the fly ash. If the raw ash or fly ash obtained in the implementation process does not contain harmful substances or contains only trace amounts of harmful substances, it does not need to go through the above treatment and can be directly put into the high-temperature melting furnace for melting.

The liquid washing process (1) of the present invention comprises at least one liquid washing step (10), wherein the liquid washing step (10) is to stir and mix the fly ash and the liquid according to a fixed ratio so that the harmful substances are dissolved in the liquid, and the liquid can be selected from a liquid solution such as water (water washing), salt water, soda water, saline alcohol or acid solution (acid washing); then the mixture is deliquated to obtain an intermediate product (A), and the intermediate product (A) is then put into a melting furnace (2). The melting furnace (2) is defined as a melting furnace equipment that melts solid substances into liquid molten metal at high temperature, and can generate high temperature by burning gas, heavy oil or other fuels, or by electric heating. The intermediate products (A) are melted at a high temperature of about 900-2000°C by heat sources such as power or plasma. For example, a feasible embodiment: a direct-fire melting furnace can be further used, which is an emulsified burner-type surface melting treatment device. No additional emulsifier is needed to fully mix liquid fuels such as heavy oil with water to produce an emulsified combustion effect. The treatment temperature of the direct-fire melting furnace can exceed 1800°C. After the intermediate product (A) is melted into molten slurry at a high temperature, the slurry is led out and cooled (3) to obtain the final product (B), which can be recycled as a building material, bone material or filling material.

The cooling treatment (3) is to cool the molten metal and solidify it into a solidified product. However, there are several ways to cool the molten metal, such as water cooling, air cooling, oil cooling, etc. or other cooling methods [the inventor's previous application disclosed various methods that can be implemented]. In terms of water cooling, a water quenching method is used. The water quenching method includes cooling the molten metal by spraying a constant pressure water flow and cooling the molten metal by dripping into a cooling water tank. In the air cooling method, the molten metal is rapidly cooled in a low temperature environment for a short time, or slowly cooled in a room temperature environment for a long time. All of the above are feasible implementation methods.

However, the present invention has many variations and implementations in actual operation, which are described in detail below:

In one embodiment, the liquid washing process (1) includes a first liquid washing step (10) and a second liquid washing step (10). In the first liquid washing step (10), fly ash and liquid are mixed according to a predetermined ratio, and after being stirred and mixed, a first deliquoring step (11) is performed to obtain a first intermediate product (A) (i.e., solid fly ash). The first intermediate product (A) is then subjected to a second liquid washing step (10). In the second liquid washing step (10), the first intermediate product (A) is mixed with liquid, and the second liquid washing step (11) is performed to obtain a first intermediate product (A) (i.e., solid fly ash). The liquid of (10) is further made of the filtrate separated by the first dehydration (11), and the filtrate is directly or after subsequent water treatment introduced into the second liquid washing step (10) to be mixed with the first intermediate product (A), and after stirring and mixing, the second dehydration (11) is applied to obtain a second intermediate product (A), and the liquid washing filtrate separated by the second dehydration (11) can be introduced back into the first liquid washing step (10) for use; the second intermediate product (A) is put into the melting furnace (2) for high-temperature melting for subsequent processing. The above embodiment is a secondary liquid washing step (10). However, in the multiple liquid washing steps (10), the above method is still followed, and the filter liquid from the previous liquid washing is used for mixing, and then the filter liquid is returned to the previous liquid washing step (10) for use after dewatering (11), thereby achieving a mechanism for recycling and reusing the filter liquid.

In another embodiment, the second intermediate product (A) is subjected to shaping (12) treatment to be pressed and shaped into blocks or granules of appropriate size so that the blocks are evenly heated in the melting furnace (2). At the same time, the shaped intermediate product (A) can be dried by storage (13) to reduce moisture and shorten the melting time.

In another embodiment, the melting furnace (2) is connected to a heat exchanger (21), one end of the heat exchanger (21) is connected to a blower (22), and the other end is connected to a feed water preheater (23). The blower (22) guides external air through the heat exchanger (21) for use in combustion of the melting furnace (2), and the high-temperature hot air generated by the melting furnace (2) is processed by the heat exchanger (21) and guided to the feed water preheater (23), and the feed water preheater (23) is connected to other equipment for use.

However, another embodiment is provided, that is, the fly ash is prepared by pre-treating the raw ash, adding pre-additives and washing with water, and then directly melted into molten slurry at high temperature in the melting furnace (2), and the molten slurry is discharged and cooled (3) to obtain the final product; in this embodiment, some harmful substances are removed during the initial washing process to replace the liquid washing process (1), so that the industry can directly perform a volume reduction process on the fly ash after the pre-treatment.

The above embodiments constitute a fly ash liquid washing and melting mechanism that is used repeatedly and cyclically, which can effectively achieve the advantages and effects of saving the amount of liquid washing liquid used (water consumption) and saving energy.

The present invention uses a liquid washing mechanism to treat harmful fly ash. The fly ash after the liquid washing treatment can effectively reduce harmful substances. The following is a liquid washing treatment using calcium fly ash or sodium fly ash. The experimental data proves the effect of liquid washing treatment (1) as follows:

(I) Calcium fly ash - using a weight ratio of 1:9, for example, 50g of calcium fly ash: 450g of water, in the liquid washing process (1), the chlorine ion content of the mixed liquid after washing and the solid fly ash (i.e., the intermediate product) is shown in the table: L/S=9 pH Conductivity(mS/cm) Chloride ion concentration (ppm) Total chlorine ions (mg) Liquid washing fly ash removal rate (%) Filter 11.95 46.9 53500 22951 95.5 Solid fly ash - - 38704 1069

(II) Sodium fly ash - using a weight ratio of 1:9, for example, 100g sodium fly ash: 900g water, in the liquid washing process (1), the chlorine ion content of the mixed liquid after washing and the solid fly ash (i.e., intermediate product) is shown in the table: L/S=9 pH Conductivity(mS/cm) Chloride ion concentration (ppm) Total chlorine ions (mg) Liquid washing fly ash removal rate (%) Filter 12.01 40.41 13182 11917 97.1 Solid fly ash 1.08 19.39 15811 353

Through the above experimental results, it can be clearly known that after the fly ash is treated with liquid washing, whether it is calcium-based or sodium-based fly ash, harmful chlorine ions in the fly ash can be effectively removed, and the removal rate is as high as 95.5~97.1%. However, the above-mentioned liquid washing fly ash ratio is only part of the experimental data, and the ratio can be adjusted according to the properties of the fly ash. According to the inventor's experiments, the optimal range of the weight ratio of fly ash to liquid is between 1:1~9.

The components of the fly ash liquid before and after washing were further compared and analyzed, as shown in the following table:

(I) Calcium system: Element Unit Fly ash before liquid washing (Ca) Fly ash after liquid washing (Ca) Calcium oxide (CaO) mass% 43.30 51.30 Chlorine (Cl) mass% 21.40 7.90 Sodium (Na) mass% 14.50 9.90 Sulfur trioxide (SO ₃ ) mass% 5.64 9.61 Magnesium Oxide (MgO) mass% 5.48 4.94 Potassium oxide (K ₂ O) mass% 3.58 1.15 Silicon dioxide (SiO ₂ ) mass% 2.52 7.07 Alumina (Al ₂ O ₃ ) mass% 1.04 2.69 Iron oxide (Fe ₂ O ₃ ) mass% 0.8250 2.0700 Zinc Oxide (ZnO) mass% 0.7460 1.2800 Titanium dioxide (TiO ₂ ) mass% 0.2430 0.8520 Phosphorus pentoxide (P ₂ O ₅ ) mass% 0.1830 0.6210 Lead monoxide (PbO) mass% 0.1250 0.1510 Copper Oxide (CuO) mass% 0.0435 0.0694 Chromium trioxide (Cr ₂ O ₃ ) mass% 0.0090 0.0245

(ii) Sodium series: Element Unit Fly ash before liquid washing (Na) Fly ash after liquid washing (Na) Calcium oxide (CaO) mass% 10.60 45.50 Chlorine (Cl) mass% 29.70 3.84 Sodium (Na) mass% 33.00 13.00 Sulfur trioxide (SO ₃ ) mass% 6.36 2.70 Magnesium Oxide (MgO) mass% 5.67 2.76 Potassium oxide (K ₂ O) mass% 7.17 2.85 Silicon dioxide (SiO ₂ ) mass% 4.09 15.70 Alumina (Al ₂ O ₃ ) mass% 1.26 2.60 Iron oxide (Fe ₂ O ₃ ) mass% 0.1720 1.2100 Zinc Oxide (ZnO) mass% 0.9630 5.4700 Titanium dioxide (TiO ₂ ) mass% 0.1620 1.0700 Phosphorus pentoxide (P ₂ O ₅ ) mass% 0.2360 1.3200 Lead monoxide (PbO) mass% 0.0658 0.4230 Copper Oxide (CuO) mass% 0.0369 0.1507 Chromium trioxide (Cr ₂ O ₃ ) mass% 0.0111 0.0565

From the above-mentioned fly ash component contents before and after liquid washing, it can be seen that the chlorine (Cl) content of the calcium-based fly ash before liquid washing is 21.40 mass%, and only 7.90 mass% remains after liquid washing, while the sodium (Na) content is 14.50 mass%, and only 9.90 mass% remains after liquid washing; while the chlorine (Cl) content of the sodium-based fly ash before liquid washing is 29.70 mass%, and only 3.84 mass% remains after liquid washing, while the sodium (Na) content is 33.00 mass%, and only 13.00 mass% remains after liquid washing; it can be seen that most of the chlorine (Cl) and sodium (Na) in the fly ash are dissolved in water after liquid washing treatment, and liquid washing treatment can indeed effectively remove harmful substances.

The solid fly ash after the liquid washing treatment (i.e. the intermediate product (A)) is put into a melting furnace (2) for high temperature melting. Since most of the harmful substances have been removed from the solid fly ash, the factors caused by chemical changes during the combustion process are reduced, which can effectively reduce the problem of corrosion damage to the melting furnace. At the same time, after the intermediate product (A) is melted into molten slurry at high temperature, the molten slurry is discharged and then cooled. The cooling treatment (3) technology can cool the molten metal by spraying low-temperature cooling water with water column, dripping from cooling water tank, etc. These cooling treatment technologies have been disclosed in the previous case applied by the inventor and will not be elaborated here. After the molten metal is cooled, the final product can be obtained. These recycled materials change their density and shape, reduce their volume and strengthen their structure, so that the overall strength of the subsequent finished product is improved.

However, the aforementioned embodiments or drawings do not limit the product structure or usage of the present invention. Any appropriate changes or modifications by a person having ordinary knowledge in the relevant technical field should be deemed to be within the patent scope of the present invention.

From the above description of the composition and use of the system of the present invention, it can be seen that the present invention has the following advantages compared with the existing structure:

1. Traditionally, fly ash is mixed with cement and buried, which causes environmental pollution. However, the present invention processes the fly ash by liquid washing before melting it in a melting furnace. The combination of the two can effectively improve the traditional shortcomings and is the first technology in the industry. It can also reduce the use of landfills and extend the life of landfills.

2. The present invention is applied to the fly ash treatment method of the melting furnace. Most of the harmful substances have been removed in the intermediate product (solid fly ash) after liquid washing, and the corrosion damage to the boiler caused by chemical changes during the combustion process is reduced. The melting furnace is safely protected from damage, thereby achieving the effects of equipment corrosion prevention, anti-blocking, reducing fly ash volume and volume, reducing air pollution, and protecting the melting furnace.

3. The present invention is applied to the fly ash treatment method of the smelting furnace. The fly ash can effectively remove harmful substances through the liquid washing process, and also reduce the overall weight and volume of the fly ash. Therefore, it can be seen that the liquid washing process also achieves the effect of reducing the volume.

4. The present invention is applied to the fly ash treatment method of the melting furnace. The final product changes its density structure through molten water quenching, has the effect of reducing volume and making it harmless, and can achieve the effect of reducing volume and recycling.

5. The fly ash treatment method of the present invention is applied to a melting furnace, which as a whole constitutes a repeated cyclic fly ash liquid washing melting mechanism, which can effectively achieve the advantages and effects of saving the use of liquid washing liquid (water consumption) and saving energy.

In summary, the embodiments of the present invention can achieve the expected effects, and the specific structure disclosed therein has not been seen in similar products, nor has it been disclosed before the application. It fully complies with the provisions and requirements of the Patent Law. Therefore, an application for an invention patent is filed in accordance with the law, and we sincerely request your review and grant of the patent. We would be grateful for your kindness.

The present invention:

1: Liquid washing

10: Liquid washing step

11: Dehydration

12: Plastic surgery

13: Storage

2: Melting furnace

21: Heat exchanger

22: Blower

23: Feedwater preheater

3: Cooling treatment

A: Intermediate products

B: Recycled materials

Figure 1: Schematic diagram of the overall structure of the present invention.

Figure 2: Schematic diagram of the fly ash pre-treatment block of the present invention.

Figure 3: Schematic diagram of the fly ash added to the additive block of the present invention.

1: Liquid washing process 10: Liquid washing step 11: Dehydration 12: Shaping 13: Storage 2: Melting furnace 21: Heat exchanger 22: Blower 23: Feed water preheater 3: Cooling process A: Intermediate product B: Recycled material

Claims (11)

A fly ash treatment method for a melting furnace comprises the following steps: S1) adding an additive to the fly ash, wherein the additive is a chemical additive with a neutralizing acid-base value or a physical additive with a dilution and concentration adjustment function, or a mixture thereof, and then removing harmful substances through a liquid washing process to obtain an intermediate product; S2) placing the intermediate product after liquid washing into a melting furnace to be melted at a high temperature into a molten slurry, and then draining the slurry and cooling it to obtain the final product. A fly ash treatment method for a smelting furnace as described in claim 1, wherein the fly ash is raw ash generated from industrial processing, combustion or incineration. As described in claim 1, the fly ash treatment method used in a smelting furnace, wherein the fly ash is raw ash produced by industrial processing, combustion or incineration and pre-treated, and the pre-treatment includes adding a pre-additive to the raw ash, and the pre-additive is a chemical additive with neutralizing acid-base value or a physical additive with dilution and concentration adjustment, or a mixture thereof. As described in claim 1, the fly ash treatment method used in a smelting furnace, wherein the fly ash is raw ash produced by industrial processing, combustion or incineration and is pre-treated, and the pre-treatment includes a water washing treatment, which is to add water to the raw ash according to a weight ratio, and dehydrate and remove some harmful substances after mixing. As described in claim 1, the fly ash treatment method used in a smelting furnace, wherein the fly ash is raw ash produced by industrial processing, combustion or incineration and subjected to pre-treatment. The pre-treatment includes adding a pre-additive and a water washing treatment to the raw ash. The pre-additive is a chemical additive with a neutralizing acid-base value or a physical additive with a dilution and concentration adjustment function, or a mixture thereof. The water washing treatment is to add water to the raw ash containing the pre-additive according to a weight ratio, and dehydrate to remove some harmful substances after mixing. The fly ash treatment method used in a smelting furnace as described in claim 1, wherein the liquid washing treatment includes at least one liquid washing step, wherein the liquid washing step is to mix the fly ash and liquid according to a fixed ratio, and then perform a deliquescence treatment after stirring and mixing, and obtain the intermediate product. A fly ash treatment method for a smelting furnace as described in claim 6, wherein the liquid washing treatment includes a first liquid washing step and a second liquid washing step, wherein the fly ash and liquid are mixed in the first liquid washing step, and after being stirred and mixed, a first dehydration is performed to obtain a first intermediate product, and then the first intermediate product is subjected to the second liquid washing step, and in the second liquid washing step, the first intermediate product is mixed with the liquid washing filter separated by the first dehydration, and the liquid washing filter is introduced into the second liquid washing step to be mixed with the first intermediate product, and then a second dehydration is performed to obtain a second intermediate product, and the liquid washing filter separated by the second dehydration can be introduced back into the first liquid washing step for use. The fly ash treatment method for a smelting furnace as described in claim 1 further comprises a shaping step and a storage step after step (S1), wherein the shaping step is to press and shape the intermediate product into a block, and the storage step is to dry the shaped intermediate product through storage to reduce the water content. As described in claim 1, the fly ash treatment method for a smelting furnace is applied, wherein the smelting furnace is connected to a heat exchanger, one end of the heat exchanger is connected to a blower, and the other end is connected to a feed water preheater, and the blower guides the external air through the heat exchanger for use in the smelting furnace combustion, and the high-temperature hot air generated by the smelting furnace is treated by the heat exchanger and guided to the feed water preheater for output. A fly ash treatment method for a molten furnace as described in any one of claims 1 to 5, wherein the weight ratio of the fly ash to the liquid is in the range of 1:1 to 9. A fly ash treatment method applied to a melting furnace as described in any one of claims 1 to 5, wherein the melting furnace performs melting at a temperature of 900-2000°C.

Images