Sintered ore sintering method using flue gas desulfurization ash

Abstract

The invention discloses a sintering ore sintering method using flue gas desulfurization ash, and belongs to the technical field of sintering ore production, and the sintering ore sintering method comprises the following steps: collecting desulfurization ash in flue gas desulfurization equipment, pretreating the desulfurization ash, and detecting the pretreated desulfurization ash to obtain a detection result of the desulfurization ash; the method comprises the following steps: adjusting the ratio of various raw materials in sintered ore according to production requirements and detection results of the sintered ore, and mixing the raw materials according to the adjusted ratio to obtain a mixture; feeding the mixture into a sintering furnace to form a material layer with a set thickness, and heating the material layer through high-temperature airflow to realize a sintering process; after sintering is completed, cooling the sintered ore through cooling equipment, and screening the cooled sintered ore to obtain a qualified sintered ore finished product; and chemical components and physical properties of the sintered ore finished product are detected, and process optimization is carried out according to problems in production. The problems that in the prior art, flue gas desulfurization ash cannot be effectively utilized, and the environment is polluted can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of sintered ore production, and in particular relates to a sintered ore sintering method utilizing flue gas desulfurization ash. Background Art

[0002] SO2, as the main component of acid rain, has caused serious damage to the natural environment and ecosystem. Therefore, the improvement and perfection of flue gas desulfurization technology has become imminent, and the production of desulfurization by-products is also increasing.

[0003] In the desulfurization process, the flue gas is first treated with an electrostatic precipitator, at which point the dust content in the flue gas has been greatly reduced. Subsequently, sintering dry and semi-dry desulfurization technologies are used, using high-purity, highly active quicklime as a desulfurizer. The desulfurized ash obtained after treatment by these methods usually appears as a very light red powdery substance containing a small amount of water. Its bulk density is generally between 0.85 and 1.0 tons per cubic meter, while its true density is between 2.25 and 2.69 tons per cubic meter. The particle diameter of the desulfurized ash is approximately between a few microns and more than ten microns. After adding water and stirring, it is easy to form a slurry with good viscosity. Through chemical composition analysis, we can find that the sintering dry and semi-dry desulfurization ash mainly contains calcium sulfite, limestone, and a small amount of calcium hydroxide, calcium sulfate, calcium chloride, calcium fluoride, silicon dioxide (SiO2), magnesium oxide (MgO), aluminum oxide (Al2O3), iron oxide (Fe2O3) and other components. Among them, the total content of calcium sulfite, limestone and a small amount of calcium hydroxide and calcium sulfate is about 90% to 95%. At present, the treatment method for these desulfurization by-products is not mature enough, and they are mainly piled up in the slag yards of various enterprises.

[0004] The above information disclosed in this background technology is only used to increase the understanding of the background technology of the present invention and therefore, it may include information that does not constitute the prior art known to ordinary technicians in this field. Summary of the invention

[0005] The object of the present invention is to provide a sintering method for sintered ore using flue gas desulfurization ash, so as to solve the problem in the prior art that the flue gas desulfurization ash cannot be effectively utilized and pollutes the environment.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A sintering method for sintered ore using flue gas desulfurization ash, comprising:

[0008] Step 1, collecting desulfurization ash from the flue gas desulfurization equipment, pre-treating the desulfurization ash, and testing the pre-treated desulfurization ash to obtain a test result of the desulfurization ash, wherein the test result includes the chemical composition, particle size, and water content of the desulfurization ash;

[0009] Step 2: According to the production requirements and test results of the sintered ore, the ratio of various raw materials in the sintered ore is adjusted, and the raw materials are mixed according to the adjusted ratio to obtain a mixed material;

[0010] Step 3: feeding the mixed material into a sintering furnace to form a material layer of a set thickness, and heating the material layer by a high-temperature airflow to realize a sintering process;

[0011] Step 4: After sintering is completed, the sintered ore is cooled by a cooling device, and the cooled sintered ore is screened to obtain qualified sintered ore products;

[0012] Step 5: Test the chemical composition and physical properties of the sintered ore product and optimize the process according to problems encountered in production.

[0013] Preferably, the pretreatment comprises:

[0014] Using ultrasonic vibration screening technology to classify the desulfurized ash into particle levels to remove impurities in the desulfurized ash;

[0015] The desulfurized ash is dried by using microwave drying technology;

[0016] The Internet of Things technology is used to conduct real-time monitoring and data collection of various parameters in the pretreatment process.

[0017] Preferably, step 2 includes:

[0018] The desulfurization ash is treated with low-temperature pyrolysis technology to decompose the harmful components into harmless substances at low temperature;

[0019] Using organic or inorganic chemical additives to adjust the chemical composition of the desulfurized ash;

[0020] Based on the data collected by the Internet of Things, artificial intelligence technology is used to predict the characteristics of the desulfurization ash and adjust the proportion of the desulfurization ash.

[0021] Preferably, step three includes:

[0022] Controlling the humidity of the mixed material according to the sintering requirements, and passing the mixed material through a pelletizer to form pellets;

[0023] The sintering furnace is divided into a plurality of heating zones by means of segmented heating technology, and each zone is set with a different temperature gradient to heat the mixed material;

[0024] The waste gas recovery system is used to collect the waste gas generated during the sintering process, and it is recycled after being treated by a gas purification device.

[0025] Preferably, step four includes:

[0026] The sintered ore is controlled in different temperature ranges by adopting a staged cooling method;

[0027] A composite cooling method combining air and water cooling is adopted to cool the sintered ore by guiding the air and water flow to cooperate with each other;

[0028] The temperature distribution, crack conditions and surface defects of the sintered ore after cooling are detected in real time by laser scanning technology.

[0029] Preferably, step five includes:

[0030] Surface treatment is performed through laser cladding, sandblasting, and pickling to remove surface impurities of the sintered ore products;

[0031] using a machine learning algorithm to analyze data generated during the sintering process, predict sintering results and optimize parameter settings;

[0032] Through big data analysis, possible anomalies in the sintering process can be identified and adjusted in real time.

[0033] Preferably, a dust removal and desulfurization device is used to purify the dust and sulfur dioxide gas generated during the sintering process, during which a closed collection and treatment method is used to reduce dust leakage.

[0034] Preferably, a cooling water circulation system is established to filter, purify and reuse the water used in the cooling process, and automatic control technology is applied to monitor and adjust the operating status of the cooling water circulation system in real time.

[0035] Preferably, renewable energy such as solar energy and wind energy is used to provide additional energy supply for the sintering furnace.

[0036] Preferably, a continuous sintering furnace system is used to achieve all-weather continuous production through continuous feeding and discharging.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention first pre-treats and tests the desulfurization ash to ensure that its parameters such as chemical composition, particle size and water content meet the production requirements; then, the proportion of each raw material of the sintered ore is adjusted according to the test results, so that the desulfurization ash can work synergistically with other raw materials to improve the stability of the sintering process and the quality of the mineral. Through the high-temperature sintering process, the desulfurization ash is fully utilized, and the quality of the finished sintered ore can be optimized through subsequent chemical composition and physical property tests to ensure that the final product meets the standards. Overall, this method not only reduces the stacking and pollution risks of waste desulfurization ash, but also effectively converts it into a valuable production resource, promoting the development of green production and resource recycling.

[0039] In the current technical field, flue gas desulfurization ash is usually used as an auxiliary material and sintered together with sintered brick raw materials to produce sintered ore products that meet the standards. However, in practical applications, the chemical composition and physical properties of flue gas desulfurization ash may be unstable, so its quality must be strictly monitored and its addition ratio during the sintering process must be accurately controlled. If excessive addition is made, the quality of the sintered ore may be reduced; conversely, if insufficient addition is made, the expected improvement effect may not be achieved. In addition, the processing and utilization of flue gas desulfurization ash requires more complex equipment and process technology, and must be equipped with appropriate mixing, blending, heating and sintering systems.

[0040] The present invention aims to make the particle size distribution of flue gas desulfurization ash more uniform, thereby improving its miscibility and reactivity with other raw materials. By detecting the chemical composition of flue gas desulfurization ash, the proportion of its addition during the sintering process is adjusted to ensure the final quality of the sintered ore. At the same time, the composition of flue gas desulfurization ash is optimized to reduce the content of harmful components in the waste material. The segmented heating technology is used to ensure the uniform distribution of heat during the sintering process, maximize the sintering efficiency of flue gas desulfurization ash, and thus improve energy efficiency and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Flowchart of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Embodiment 1:

[0044] See also Figure 1 As shown, a sintering method of sintered ore using flue gas desulfurization ash comprises:

[0045] Step 1: collecting desulfurization ash from the flue gas desulfurization equipment and pre-treating it, testing the chemical composition, particle size and water content of the desulfurization ash to obtain the test results;

[0046] Specifically: First, the desulfurization ash is collected from the flue gas desulfurization equipment and subjected to a series of pretreatment steps. These pretreatment steps include but are not limited to screening, drying, etc. to ensure the representativeness of the desulfurization ash samples. Subsequently, these pretreated desulfurization ash samples are subjected to detailed chemical composition analysis to determine the various chemical substances contained therein and their proportions. In addition, the particle size of the desulfurization ash needs to be accurately measured to understand its particle size distribution. At the same time, the moisture content of the desulfurization ash is measured to evaluate its degree of dryness. Through these testing steps, detailed test results on the desulfurization ash can be obtained, providing a scientific basis for subsequent processing and utilization.

[0047] Step 2: adjusting the ratio of each raw material in the sintered ore according to the production requirements of the sintered ore and the test results, and mixing the raw materials according to the adjusted ratio to obtain a mixed material;

[0048] Specifically: In order to meet the production standards and quality requirements of sintered ore, the proportion of each raw material in the sintered ore is accurately adjusted according to the test results. After adjusting the proportion of raw materials, the raw materials are mixed according to the new proportion scheme to obtain a uniform mixture that meets production requirements.

[0049] Step 3: feeding the mixed material into a sintering furnace to form a material layer of a set thickness, and heating the material layer by a high-temperature airflow to realize a sintering process;

[0050] Specifically: the mixed material is fed into a sintering furnace to form a material layer of a set thickness, and the material layer is heated by a high-temperature airflow to achieve a sintering process; during this process, the thickness of the material layer is accurately calculated and controlled to ensure the consistency of the sintering quality and the performance of the product.

[0051] Step 4: After sintering is completed, the sintered ore is cooled by a cooling device, and the cooled sintered ore is screened to screen out qualified sintered ore products;

[0052] Specifically: After the sintering process is completed, we use cooling equipment to effectively cool the sintered ore. Subsequently, the cooled sintered ore is carefully screened to select the sintered ore products that meet the quality standards.

[0053] Step 5: Test the chemical composition and physical properties of the sintered ore product and optimize the process according to problems encountered in production.

[0054] The described sintered ore products are subjected to detailed chemical composition analysis and physical property testing in order to optimize the process flow according to the problems encountered in the production process.

[0055] In the above embodiment, the preprocessing includes the following contents:

[0056] Ultrasonic vibration screening technology is used to finely grade the desulfurized ash at the particle level to remove impurities; this can improve the fluidity of the mixture during the subsequent sintering process and the quality of the finished ore. Microwave drying technology is used to dry the desulfurized ash; compared with traditional hot air drying, microwave drying technology has higher energy efficiency and shorter processing time, and can quickly and evenly remove moisture from the desulfurized ash. Through the Internet of Things technology, various parameters in the desulfurized ash pretreatment process are monitored in real time and data is collected.

[0057] Low-temperature pyrolysis technology is used to treat desulfurized ash, and harmful components (such as sulfides, heavy metals, etc.) therein are decomposed into harmless substances under low-temperature conditions; organic or inorganic chemical additives (such as bauxite, calcium salts, magnesium salts, etc.) are used to adjust the chemical composition of desulfurized ash, thereby improving its reactivity during the sintering process and preventing excessive sulfur content from having an adverse effect on the quality of the sintered ore.

[0058] Based on the collected data, artificial intelligence technology is used to predict the characteristics of desulfurization ash and adjust its proportion in the mixture accordingly. By real-time monitoring of desulfurization ash humidity, particle size, chemical composition and other data, the pretreatment process (such as drying temperature and screening particle size) is dynamically adjusted to ensure the uniformity and stability of raw material quality.

[0059] According to the sintering requirements, the humidity of the mixture is controlled, and the mixture is formed into pellets through a pelletizer; the sintering furnace is divided into multiple heating zones through segmented heating technology, and a different temperature gradient is set in each zone to heat the mixture; for example, a lower temperature is used for material preheating and water evaporation in the early stage of sintering, while a higher temperature is used in the high-temperature stage of sintering to promote mineral dissolution and melting reaction.

[0060] The adjustable atmosphere sintering furnace can adjust the ratio of oxygen, nitrogen, carbon dioxide and other gases in the furnace to create the most suitable reaction environment. For example, in the reduction reaction stage of certain minerals, controlling the low oxygen environment can promote the reduction reaction and improve the quality of sintered ore. The waste gas recovery system is used to collect the waste gas generated during the sintering process, and it is recycled after being treated by the gas purification device.

[0061] The sintering ore is properly controlled in different temperature ranges by adopting a staged cooling method; in the high temperature stage (such as above 1200℃), rapid cooling can be performed to quickly reduce the temperature and prevent cracks on the surface of the sintering ore. In the medium and low temperature stage (such as below 1000℃), a slow cooling method can be adopted to ensure that the crystal structure inside the sintering ore is fully solidified and stabilized.

[0062] The composite cooling method of air-water cooling is adopted to cool the sintered ore by guiding the air and water flow to work together; it not only improves the cooling efficiency, but also avoids the problems of excessive wetting and ore surface cracks that may be caused by using only water cooling. The multi-stage cooling tower is used to divide the cooling process into multiple stages, and each stage has a different cooling strategy. For example, the primary cooling adopts high-efficiency air cooling, while the subsequent stages adopt slow cooling natural air cooling or heated air auxiliary cooling to ensure that the physical properties of the sintered ore remain in the best state.

[0063] Embodiment 2:

[0064] See also Figure 1 As shown, this embodiment is basically the same as the above embodiment, except that the temperature distribution, crack conditions and surface defects of the sintered ore after cooling are monitored in real time by using laser scanning technology. Through the immediate feedback of data, the cooling parameters can be adjusted quickly to prevent problems caused by overcooling or uneven cooling.

[0065] Surface treatment is performed by laser cladding, sandblasting, pickling and other methods to remove impurities from the surface of the sintered ore products; for materials that aim to increase density and reduce porosity, hot isostatic pressing can be performed. This treatment process is carried out under high temperature and high pressure, which helps to enhance the mechanical properties and density of the sintered parts.

[0066] Machine learning algorithms are used to analyze data from the sintering process, including key parameters such as temperature, time, and atmosphere, and combined with experimental data to predict sintering results and optimize related parameter settings. Big data analysis technology is used to identify potential abnormalities in the sintering process and make real-time adjustments.

[0067] This method also adopts dust removal and desulfurization equipment to purify the dust and sulfur dioxide gas generated during the sintering process. In this process, a closed collection and treatment method is adopted to reduce the risk of dust leakage. At the same time, a cooling water circulation system is constructed to filter, purify and reuse the water used in the cooling process. In addition, automatic control technology is applied to monitor and adjust the operating status of the cooling water circulation system in real time. Renewable energy such as solar energy and wind energy is used to provide additional energy supply for the sintering furnace. A continuous sintering furnace system is used to achieve continuous production around the clock through continuous feeding and discharging.

[0068] In summary, the present invention first pre-treats and tests the desulfurization ash to ensure that its chemical composition, particle size, water content and other parameters meet production requirements. Subsequently, the proportion of each raw material of the sintered ore is adjusted according to the test results, so that the desulfurization ash can work synergistically with other raw materials to improve the stability of the sintering process and the quality of the mineral. Through the high-temperature sintering process, the desulfurization ash is fully utilized, and the quality of the finished sintered ore can be optimized through subsequent chemical composition and physical property tests to ensure that the final product meets the standard requirements. In general, this method not only reduces the stacking and pollution risks of waste desulfurization ash, but also effectively converts it into a valuable production resource, promoting the development of green production and resource recycling.

[0069] Embodiment 3:

[0070] The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, each process of the above-mentioned sintering method embodiment of the sintered ore is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. Among them, the computer-readable storage medium, such as a read-only memory (Read-Only Memory, referred to as ROM), a random access memory (Random ACGess Memory, referred to as RAM), a magnetic disk or an optical disk, etc.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0072] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a program, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A way to specify functions in one or more boxes.

[0073] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0075] In the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0076] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0077] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sintering method for sintered ore using flue gas desulfurization ash, characterized in that: include: Step 1, collecting desulfurization ash from the flue gas desulfurization equipment, pre-treating the desulfurization ash, and testing the pre-treated desulfurization ash to obtain a test result of the desulfurization ash, wherein the test result includes the chemical composition, particle size, and water content of the desulfurization ash; Step 2: According to the production requirements and test results of the sintered ore, the ratio of various raw materials in the sintered ore is adjusted, and the raw materials are mixed according to the adjusted ratio to obtain a mixed material; Step 3: feeding the mixed material into a sintering furnace to form a material layer of a set thickness, and heating the material layer by a high-temperature airflow to realize a sintering process; Step 4: After sintering is completed, the sintered ore is cooled by a cooling device, and the cooled sintered ore is screened to obtain qualified sintered ore products; Step 5: Test the chemical composition and physical properties of the sintered ore product and optimize the process according to problems encountered in production.

2. The sintering method of sintered ore using flue gas desulfurization ash according to claim 1, characterized in that: The pre-processing comprises: Using ultrasonic vibration screening technology to classify the desulfurized ash into particle levels to remove impurities in the desulfurized ash; The desulfurized ash is dried by using microwave drying technology; The Internet of Things technology is used to conduct real-time monitoring and data collection of various parameters in the pretreatment process.

3. The sintering method of sintered ore using flue gas desulfurization ash according to claim 2, characterized in that: Step 2 includes: The desulfurization ash is treated with low-temperature pyrolysis technology to decompose the harmful components into harmless substances at low temperature; Using organic or inorganic chemical additives to adjust the chemical composition of the desulfurized ash; Based on the data collected by the Internet of Things, artificial intelligence technology is used to predict the characteristics of the desulfurization ash and adjust the proportion of the desulfurization ash.

4. The sintering method of sintered ore using flue gas desulfurization ash according to claim 3, characterized in that: Step three includes: Controlling the humidity of the mixed material according to the sintering requirements, and passing the mixed material through a pelletizer to form pellets; The sintering furnace is divided into a plurality of heating zones by means of segmented heating technology, and each zone is set with a different temperature gradient to heat the mixed material; The waste gas recovery system is used to collect the waste gas generated during the sintering process, and it is recycled after being treated by a gas purification device.

5. The sintering method of sintered ore using flue gas desulfurization ash according to claim 4, characterized in that: Step 4 includes: The sintered ore is controlled in different temperature ranges by adopting a staged cooling method; A composite cooling method combining air and water cooling is adopted to cool the sintered ore by guiding the air and water flow to cooperate with each other; The temperature distribution, crack conditions and surface defects of the sintered ore after cooling are detected in real time by laser scanning technology.

6. The sintering method of sintered ore using flue gas desulfurization ash according to claim 5, characterized in that: Step five includes: Surface treatment is performed through laser cladding, sandblasting, and pickling to remove surface impurities of the sintered ore products; using a machine learning algorithm to analyze data generated during the sintering process, predict sintering results and optimize parameter settings; Through big data analysis, possible anomalies in the sintering process can be identified and adjusted in real time.

7. The sintering method of sintered ore using flue gas desulfurization ash according to claim 6, characterized in that: Dust removal and desulfurization equipment is used to purify the dust and sulfur dioxide gas generated during the sintering process. During this period, closed collection and treatment methods are adopted to reduce dust leakage.

8. The sintering method of sintered ore using flue gas desulfurization ash according to claim 7, characterized in that: Establish a cooling water circulation system to filter, purify and reuse the water used in the cooling process, and apply automated control technology to monitor and adjust the operating status of the cooling water circulation system in real time.

9. The sintering method of sintered ore using flue gas desulfurization ash according to claim 8, characterized in that: Renewable energy such as solar energy and wind energy is used to provide additional energy supply for the sintering furnace.

10. The sintering method of sintered ore using flue gas desulfurization ash according to claim 9, characterized in that: The continuous sintering furnace system is adopted to achieve continuous production around the clock through continuous feeding and discharging of materials.

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