Method for preparing composite ceramic material by using slag of liquid deslagging boiler

Abstract

The invention discloses a method for preparing composite ceramic by using slag of a liquid deslagging boiler, and belongs to the technical field of comprehensive utilization of slag. Comprising the following steps: separating slag liquid of a liquid-state deslagging boiler through a precipitation separation device to obtain a precipitate, feeding the precipitate into a porcelain making system, adding potassium carbonate and water to form a cocatalyst and a base material, and adding a batch to obtain a composite material; the composite ceramic material is obtained through normal-pressure sintering at 1030-1080 DEG C by using residual heat of slag liquid of a liquid-state deslagging boiler in a ceramic making system, and the batch comprises the following components in percentage by mass: 5-8% of mineral soil, 55-60% of stone powder, 5-8% of bentonite and 25-28% of soil, totaling 100%. According to the method, steam, pressurized air, electric energy, circulating water and other process products produced by a power plant boiler are utilized, the components and proportion of the molten ash are determined, and the solid waste of a power plant is converted into industrial products through waste heat of the slag liquid and the molten ash.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive utilization of ash and slag, and specifically relates to a method for preparing composite ceramic materials by using the ash and slag of a liquid slagging boiler. Background Art

[0002] Boilers can be divided into solid slagging boilers and liquid slagging boilers according to the slagging method. In a liquid slagging boiler, the ash and slag generated after fuel combustion are discharged in a liquid state. The discharged liquid slag is at a very high temperature and must be cooled before subsequent comprehensive utilization. At present, most liquid slagging boilers use water as a cooling medium to treat the liquid slag, that is, the liquid slag is discharged into a granulation water tank through a slag discharging device, and the liquid slag is granulated and cooled with slag flushing water, and then the cooled slag particles are discharged by a slag fishing device or a swirling jet nozzle for direct slag flushing. The high-quality heat energy of the high-temperature liquid slag is converted into the low-quality heat energy of a large amount of slag flushing water during the granulation cooling process and is wasted without being reasonably utilized. The slag capture rate of liquid slagging boilers is relatively high. For example, the slag capture rate of a cyclone furnace can reach more than 70%. These high-temperature liquid slags carry away heat when discharged, resulting in a relatively high physical heat loss of the ash and slag of liquid slagging boilers. Especially when burning high-ash coal, the physical heat loss of its ash and slag is even greater. And in the coal ash of high-alkali coal, the content of Fe 2 O 3 is relatively high, and the ash and slag mainly show the phenomenon of low-temperature eutectic of Fe and aluminosilicate minerals. Its minerals mainly include anorthite, mullite, quartz, albite, nepheline, hematite, etc. Therefore, it is very necessary to develop a strategy for ash and slag recycling, which can provide important practical guidance for future liquid slagging units burning high-alkali coal.

[0003] At present, the ash and slag of the vast majority of liquid slagging boilers at home and abroad are treated by the water quenching process, that is, water is used for slag cooling. An ash removal device is installed under the slag discharging component of the liquid slagging boiler to cool and discharge the continuously discharged ash and slag. However, after being treated by the water quenching process, the high-temperature waste heat of the ash and slag is converted into the low-temperature waste heat of the slag flushing water, so that the high-quality waste heat of the ash and slag cannot be reasonably utilized, and at present, the recovery rate of the waste heat of the slag flushing water is very low, and a large amount of waste heat of the ash and slag will still be wasted. There is also a method of using the dry granulation cooling technology for the waste heat utilization of the ash and slag of liquid slagging boilers. The dry granulation cooling technology is a technology that uses air or the like as a cooling medium to cool the slag. In the 1970s, foreign countries began to study the dry granulation cooling process. The main dry granulation cooling technologies include air quenching method, drum method, centrifugal granulation method, etc. However, due to defects such as large power consumption and low processing efficiency of the dry granulation cooling technology, none of the current dry granulation cooling technologies has truly achieved large-scale industrialization.

[0004] For the utilization of molten slag to prepare glass products, only the composition of the slag is utilized, and the waste heat of the slag is not reasonably utilized, resulting in a low utilization rate of the molten slag. Therefore, we propose a method for preparing composite ceramic materials using the slag from a liquid slag removal boiler, further clarifying the components and proportions of the molten slag, in order to reduce the total amount of solid waste emissions from power plants, effectively utilize the waste heat of the slag liquid and the molten slag, and convert the solid waste of the power plant itself into industrial products. Summary of the Invention

[0005] The present invention provides a method for preparing composite ceramic materials using the slag from a liquid slag removal boiler, effectively utilizing process products such as steam, pressurized air, electric energy, and circulating water generated by the power plant boiler itself, further clarifying the components and proportions of the molten slag, in order to reduce the total amount of solid waste emissions from power plants, effectively utilize the waste heat of the slag liquid and the molten slag, and using the equipment of the boiler itself to convert the solid waste of the power plant itself into industrial products.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] The object of the present invention is to provide a method for preparing composite ceramic materials using the slag from a liquid slag removal boiler, comprising the following steps: separating the slag liquid of the liquid slag removal boiler through a precipitation separation device to obtain a precipitate, feeding the precipitate into a porcelain-making system, adding potassium carbonate and water to form a promoter and a base material, then adding a compounding material to obtain a composite material, and performing atmospheric pressure sintering at 1030 - 1080 °C using the waste heat of the slag liquid of the liquid slag removal boiler in the porcelain-making system to obtain the composite ceramic material. The compounding material, by mass fraction, comprises the following components: mineral soil 5 - 8%, stone powder 55 - 60%, bentonite 5 - 8%, and clay 25 - 28%, with a total of 100%.

[0008] Further, the mass ratio of the precipitate, potassium carbonate, and water is 2:2:1.

[0009] Further, the mass ratio of the base material and the compounding material is 1.2:1.

[0010] Further, a slag flow port is provided on the liquid slag removal boiler, the feed port of the precipitation separation device is connected to the slag flow port, the slag liquid discharged from the slag flow port reacts with water and then is separated by precipitation to obtain a precipitate, and the discharge port of the precipitation separation device is connected to the feed port of the porcelain-making system.

[0011] Further, a slag hopper is provided on the liquid slag removal boiler, the slag flow port is located in the slag hopper, and the porcelain-making system is connected to the slag hopper to directly receive the waste heat of the slag liquid at a temperature of 1060 - 1100 °C.

[0012] Further, the porcelain-making system includes a powder-making mechanism, a shaping and hot-pressing mechanism, a drying mechanism, and a calcining mechanism. The feed inlet of the powder-making mechanism is connected to the discharge outlet of the precipitation separation device. The discharge outlet of the powder-making mechanism is connected to the shaping and hot-pressing mechanism. The shaping and hot-pressing mechanism is also connected to the drying mechanism. The drying mechanism is connected to the calcining mechanism. The calcining mechanism is connected to the slag hopper to directly receive the ash slag waste heat at a temperature of 1030 - 1080 °C.

[0013] Further, the liquid slag removal boiler further includes a liquid slag removal system. The liquid slag removal system includes an overflow funnel and a blowing pipeline. One end of the blowing pipeline penetrates through the slag hopper, and an overflow funnel is provided at the penetrated part. The overflow funnel is located below the slag flow port. A slag discharge pipe is also connected to the blowing pipeline at the side of the slag flow port. The slag discharge pipe is connected to the feed inlet of the precipitation separation device.

[0014] Further, a flow rate and temperature measurer is provided on the blowing pipeline. A blowing medium is provided in the blowing pipeline, and the blowing medium is water.

[0015] Further, a burner is provided on the liquid slag removal boiler. The pulverized coal gas stream is introduced into the liquid slag removal boiler. After being burned by the burner, the pulverized coal gas stream enters the liquid slag removal boiler. The slag liquid is formed through the combustion of the liquid slag removal boiler. The slag liquid enters the precipitation separation device through the slag flow port and the slag discharge pipe. At the same time, the blowing medium enters the precipitation separation device through the blowing pipeline. The slag liquid and the blowing medium react and are separated by precipitation to obtain precipitates. The precipitates and the batching are ball-milled by the powder-making mechanism, and the composite material is obtained through screening. The wet blank is obtained by hot-pressing in the shaping and hot-pressing mechanism. After being dried by the drying device, the composite ceramic material is obtained through atmospheric pressure sintering at 1030 - 1080 °C in the calcining mechanism by using the slag liquid waste heat of the liquid slag removal boiler.

[0016] Further, the mineral soil is one or a combination of bauxite, magnesia soil, and white potassium sand soil:

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The method for preparing the composite ceramic material by using the ash slag of the liquid slag removal boiler provided by the present invention can reduce the total amount of solid waste emissions from the power plant, effectively utilize the process products such as steam, pressurized air, electric energy, and circulating water produced by the power plant boiler itself, further clarify the components and proportions of the molten ash slag, so as to reduce the total amount of solid waste emissions from the power plant, effectively utilize the slag liquid waste heat and the molten ash slag, convert the solid waste of the power plant itself into industrial products by using the equipment of the boiler itself, improve the energy utilization efficiency, reduce the solid waste emissions of the power plant, reduce the pollutant emissions, and increase the economic benefits and social benefits of the power plant.

[0019] 2. During the preparation process of the composite ceramic material of the present invention, alkaline precipitates are formed by using the slag liquid, and alkaline oxides such as K 2 O and CaO are indirectly introduced. The incorporation of alkaline substances in the ash slag reduces the temperature at which the ceramic eutectic melt phase appears, plays a fluxing and catalytic role, increases the liquid phase amount in the composite ceramic, promotes the ceramic sintering temperature to decrease from 1200 °C to 1080 °C, and effectively utilizes the waste heat of the slag liquid to achieve energy conservation, emission reduction and low-carbon sintering in ceramic production. Description of the Drawings

[0020] Figure 1 It is a process flow diagram for the present invention to prepare a composite ceramic material by using the ash slag of a liquid slag removal boiler.

[0021] Figure 2 It is a diagram showing the influence of the dosages of different alkaline oxides in Examples 1-3 of the present invention on the water absorption rate of the composite ceramic samples.

[0022] Description of the Reference Numerals:

[0023] 1. Liquid slag removal boiler, 2. Ceramic making system, 21. Powder making mechanism, 22. Plastic shaping and hot pressing mechanism, 23. Drying mechanism, 24. Calcining mechanism, 3. Burner, 4. Slag flow port, 5. Liquid slag removal system, 6. Overflow funnel, 7. Blowing pipeline, 71. Slag discharge pipe, 8. Precipitation and separation device, 9. Slag hopper, 10. Composite insulation layer. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0025] In the following embodiments, the experimental methods are conventional methods unless otherwise specified; the reagents and materials can be obtained from commercial channels unless otherwise specified.

[0026] The present invention provides a method for preparing a composite ceramic material by using the ash slag of a liquid slag removal boiler, as Figure 1 shown, which includes the following steps:

[0027] The slag liquid of the liquid slagging boiler 1 is separated by a precipitation separation device 8 to obtain a precipitate, which is sent into a porcelain making system 2. Potassium carbonate and water are added to form a promoter and a base material, and then a compounding material is added to obtain a composite material. In the porcelain making system 2, the waste heat of the slag liquid of the liquid slagging boiler 1 is utilized to sinter the composite ceramic material at normal pressure at 1030 - 1080 °C. The compounding material, by mass fraction, includes the following components: mineral soil 5 - 8%, stone powder 55 - 60%, bentonite 5 - 8%, and clay 25 - 28%, with a total of 100%.

[0028] In the present invention, the slag liquid and the waste heat of the slag liquid of the liquid slagging boiler are effectively utilized through the precipitation separation device 8 and the porcelain making system 2. Among them, the liquid slagging boiler 1 forms slag liquid through combustion. Since the main components of the ash slag are CaO, SiO 2 , MgO, Al 2 O 3 and Fe 2 O 3 , and the pH value is greater than 7, showing a slightly alkaline property. In the present invention, the precipitation separation device 8 performs water immersion on the slag liquid and then centrifuges to obtain a precipitate. The precipitation separation device is an existing centrifugal device. The purpose of the precipitation separation device 8 is to react and cool the slag liquid with water to generate an alkaline precipitate. The alkaline precipitate is mainly extracted by flushing the ash slag with water, indirectly introducing alkaline oxides K 2 O and CaO into the composite ceramic. Potassium carbonate and water are added to the ash slag as a promoter and a base material, and then a compounding material is added. The incorporation of alkaline substances in the ash slag reduces the temperature at which the ceramic eutectic molten liquid phase appears, plays a role in fluxing and catalyzing, increases the liquid phase content in the composite ceramic, promotes the ceramic sintering temperature to be reduced from 1200 °C to 1080 °C, and effectively utilizes the waste heat of the slag liquid, realizing energy conservation, emission reduction, and low-carbon sintering in ceramic production.

[0029] The method for preparing a composite ceramic material using the ash slag of a liquid slagging boiler provided by the present invention can reduce the total amount of solid waste emissions from power plants, effectively utilize process products such as steam, pressurized air, electric energy, and circulating water produced by the power plant boilers themselves, further clarify the components and proportions of the molten ash slag, so as to reduce the total amount of solid waste emissions from power plants, effectively utilize the waste heat of the slag liquid and the molten ash slag, convert the solid waste of the power plant itself into industrial products using the equipment of the boiler itself, improve energy utilization efficiency, reduce the solid waste emissions of the power plant, reduce pollutant emissions, and increase the economic benefits and social benefits of the power plant.

[0030] In a specific embodiment, the mass ratio of the precipitate, potassium carbonate (K 2 CO 3 ) and water is 2:2:1. In the present invention, adding K 2 CO 3 is to cooperate with the alkaline substances extracted from the ash slag to indirectly introduce K2 O and CaO, thus achieving the effect of reducing the calcination temperature.

[0031] In a specific embodiment, the mass ratio of the base material to the compounding material is 1.2:1. In the present invention, the role of the base material is to provide a fluxing and catalytic effect for the compounding material, reduce the temperature at which the ceramic eutectic melt phase appears, and increase the liquid phase amount in the composite ceramic.

[0032] In a specific embodiment, a slag flow port 4 is provided on the liquid slag removal boiler 1. The slag flow port 4 is arranged at the bottom of the liquid slag removal boiler 1. The feed port of the precipitation separation device 8 is connected to the slag flow port 4. After the slag liquid discharged from the slag flow port 4 reacts with water, precipitates are obtained through precipitation separation. The discharge port of the precipitation separation device 8 is connected to the feed port of the porcelain making system 2. The precipitates separated by the precipitation separation device 8 are fed into the porcelain making system 2. Potassium carbonate and water are added into the porcelain making system 2 to form a promoter and a base material, and then a compounding material is added to obtain a composite material. In the porcelain making system 2, the waste heat of the slag liquid of the liquid slag removal boiler 1 is used for atmospheric sintering at 1030 - 1080 °C to obtain a composite ceramic material.

[0033] In a specific embodiment, a slag hopper 9 is provided on the liquid slag removal boiler 1. The slag flow port 4 is located in the slag hopper 9. The porcelain making system 2 is connected to the slag hopper 9 to directly receive the waste heat of the slag liquid at 1030 - 1080 °C. The peripheral wall of the slag hopper 9 is provided with a composite heat insulation layer 10. In the present invention, the composite heat insulation layer 10 is a composite heat insulation layer composed of a corundum castable lining and a heat-resistant heat insulation castable. In other embodiments, the above heat insulation materials can also be selected from materials such as rock wool.

[0034] In a specific embodiment, the porcelain making system 2 includes a powder making mechanism 21, a shaping and hot pressing mechanism 22, a drying mechanism 23, and a calcination mechanism 24. The feed port of the powder making mechanism 21 is connected to the discharge port of the precipitation separation device 8. The discharge port of the powder making mechanism 21 is connected to the shaping and hot pressing mechanism 22. The shaping and hot pressing mechanism 22 is also connected to the drying mechanism 23. The drying mechanism 23 is connected to the calcination mechanism 24. The calcination mechanism 24 is connected to the slag hopper 9 to directly receive the waste heat of the ash slag at 1030 - 1080 °C. In the present invention, a feed port is provided on the powder making mechanism 21. Potassium carbonate and water are added through the feed port, and then the compounding material is added. The role of the powder making mechanism 21 is to ball mill the base material and the compounding material, and then screen through a sieve mesh with a pore diameter of 0.20 mm to obtain a prefabricated material. The prefabricated material is fed into the shaping and hot pressing mechanism 22. The blank formed by hot pressing through the shaping and hot pressing mechanism 22 is a wet blank at this time. The wet blank is dried by the drying mechanism 23 to form a dry blank, and then fed into the calcination mechanism 24. The calcination mechanism 24 performs sintering at 1030 - 1080 °C through the temperature of the waste heat of the ash slag.

[0035] In a specific embodiment, the liquid slagging boiler 1 further includes a liquid slagging system 5. The liquid slagging system 5 includes an overflow hopper 6 and a blowing pipeline 7. One end of the blowing pipeline 7 penetrates through the slag hopper 9, and an overflow hopper 6 is provided at the penetrated part. The overflow hopper 6 is located below the slag flow port 4. A slag discharge pipe 71 is also connected to the side of the slag flow port 4 and on the blowing pipeline 7. The slag discharge pipe 71 is connected to the feed inlet of the precipitation separation device 8. The overflow hopper 6 is used to discharge the slag liquid gathered at the slag flow port 4 into the slag discharge pipe 71 and transport it to the precipitation separation device 8 through the slag discharge pipe 71. A sampling device and a temperature measuring device are provided at the outlet of the overflow hopper 6, and the slag liquid can be sampled to determine the physical and chemical properties of the slag liquid.

[0036] In a specific embodiment, a flow rate and temperature measurer is provided on the blowing pipeline 7. A blowing medium is provided in the blowing pipeline 7, and the blowing medium is water. The blowing medium 6 is the circulating water produced by the power plant boiler itself. The slag liquid is cooled by water and alkaline precipitation is generated. Flow rate and temperature measuring devices are installed on the blowing pipeline 7 to ensure that the blowing water flow meets the requirements for ash and slag precipitation.

[0037] In a specific embodiment, a burner 3 is provided on the liquid slagging boiler 1. Pulverized coal gas flow is introduced into the liquid slagging boiler 1. After being burned by the burner 3, the pulverized coal gas flow enters the liquid slagging boiler 1. Slag liquid is formed through the combustion of the liquid slagging boiler 1. The slag liquid enters the precipitation separation device 8 through the slag flow port 4 and the slag discharge pipe 71. At the same time, the blowing medium enters the precipitation separation device 8 through the blowing pipeline 7. The slag liquid and the blowing medium react and are separated by precipitation to obtain precipitates. The precipitates and the batching are ball-milled by the powder making mechanism 21, and the composite material is obtained by screening. After being hot-pressed by the plastic hot-pressing mechanism 22 to obtain a wet blank, and after being dried by the drying device 23, the waste heat of the slag liquid of the liquid slagging boiler 1 is used to carry out atmospheric sintering at 1030 - 1080 °C in the calcining mechanism 24 to obtain the composite ceramic material. In the present invention, the sintering temperature can be any value between 1030 - 1080 °C, such as 1030 °C, 1050 °C, 1060 °C or 1080 °C, etc., but is not limited to the listed values. Other unlisted values within the above numerical range are equally applicable and will not be elaborated one by one here.

[0038] In a specific embodiment, an in-furnace conditioning agent injection port is opened on the furnace wall of the liquid slagging boiler 1. When the overall acidity coefficient of the ash and slag components is less than 2.4, an acidic conditioning agent is added. When the overall acidity coefficient of the coal ash and slag components is greater than 2.7, an alkaline conditioning agent is added. To adjust the viscosity-temperature characteristics of the slag liquid, so as to ensure that the slag liquid flows out of the slag flow port smoothly. A high-temperature flue gas outlet is also provided at the top of the liquid slagging boiler 1, and this outlet can be connected to an externally provided dust removal device or desulfurization device to achieve environmental protection emissions.

[0039] In a specific embodiment, the mineral soil is one or a combination of bauxite, magnesia soil, and white potassium sand soil. The compounding material, by mass fraction, includes the following components: bauxite 2.0%, recycled material 3.0% (the components are shown in Table 1), Beiliu stone powder 6.3%, Wuhu stone powder 2.7%, Tengxian stone powder 25.0%, Tengxian high-sodium stone powder 24.2%, bentonite 3.0%, high-strength bentonite 3.0%, magnesia soil 2.8%, white potassium sand 1.5%, Jiate clay 6.0%, Lixiu clay 1.0%, Tangbu clay 3.0%, mud paste 4.5%, high-aluminum clay 12.0%, with a total of 100%.

[0040] Table 1 Components of the recycled material

[0041] Component <![CDATA[SiO 2 / %]]> <![CDATA[Al 2 O 3 / %]]> <![CDATA[Fe 2 O 3 / %]]> <![CDATA[TiO 2 / %]]> CaO / % MgO / % <![CDATA[K 2 O / %]]> <![CDATA[Sodium 2 O / %]]> Loss on Ignition / % Recycled Material 70.81 18.06 1.68 0.38 1.93 0.99 2.17 1.61 2.31

[0042] The following is further illustrated through specific embodiments.

[0043] Example 1

[0044] A method for preparing a composite ceramic material using the ash slag of a liquid slagging boiler, as Figure 1 shown, includes the following steps:

[0045] S1. Weigh each component of the compounding material: bauxite 2.0%, recycled material 3.0%, Beiliu stone powder 6.3%, Wuhu stone powder 2.7%, Tengxian stone powder 25.0%, Tengxian high-sodium stone powder 24.2%, bentonite 3.0%, high-strength bentonite 3.0%, magnesia soil 2.8%, white potassium sand 1.5%, Jiate clay 6.0%, Lixiu clay 1.0%, Tangbu clay 3.0%, mud paste 4.5%, high-aluminum clay 12.0%, with a total of 100%;

[0046] S2. Pass pulverized coal gas into the liquid slagging boiler 1. The bottom of the liquid slagging boiler 1 is provided with a slag flow port 4 and a slag hopper 9. The slag flow port 4 is located inside the slag hopper 9. The slag hopper 9 is connected to the calcination mechanism 24. The waste heat of the ash slag generated by the slag hopper 9 is received by the calcination mechanism 24. The slag flow port 4 is communicated with the precipitation separation device 8 through a slag discharge pipe 71. The combustion in the liquid slagging boiler 1 forms slag liquid, that is, liquid ash slag. The liquid ash slag enters the precipitation separation device 8 through the slag discharge pipe 71. Then, water is added into the precipitation separation device 8. The liquid ash slag reacts with water and cools to generate alkaline precipitates. The precipitates are separated by the precipitation separation device 8 and then sent into the powder making mechanism 21. The powder making mechanism 21 is provided with a feeding port. Potassium carbonate and water are added through the feeding port. The mass ratio of the precipitate, potassium carbonate, and water is 2:2:1. By combining potassium carbonate and water with the alkaline precipitate, K 2 O, CaO are indirectly introduced. K 2The doping mass fraction of O is 1.0%, and the doping mass fraction of CaO is 1.0%. Then, the batch material is added and ball-milled in the powder-making mechanism 21. After ball-milling, it is screened through a sieve with a pore size of 0.20 mm to obtain the preform. The wet blank formed by hot pressing through the shaping and hot-pressing mechanism 22 is dried at 130 °C for 3 h by the drying mechanism 23 to form a dry blank, and then sent to the calcining mechanism 24. The calcining mechanism 24 performs sintering at 1060 °C, 1080 °C, 1100 °C or 1140 °C through the temperature of the ash slag waste heat to obtain the composite ceramic material.

[0047] Example 2

[0048] A method for preparing a composite ceramic material using the ash slag of a liquid slag removal boiler, as Figure 1 shown, includes the following steps:

[0049] S1. Weigh each component of the batch material: bauxite 2.0%, recycled material 3.0%, Beiliu stone powder 6.3%, Wuhu stone powder 2.7%, Tengxian stone powder 25.0%, Tengxian high-sodium stone powder 24.2%, bentonite 3.0%, high-strength bentonite 3.0%, magnesia soil 2.8%, white potassium sand 1.5%, Jiate clay 6.0%, Lixiu clay 1.0%, Tangbu clay 3.0%, mud paste 4.5%, high-aluminum clay 12.0%, totaling 100%;

[0050] S2. Feed the pulverized coal gas into the liquid slag removal boiler 1. The bottom of the liquid slag removal boiler 1 is provided with a slag discharge port 4 and a slag hopper 9. The slag discharge port 4 is located in the slag hopper 9. The slag hopper 9 is connected to the calcining mechanism 24. The ash slag waste heat generated by the slag hopper 9 is received by the calcining mechanism 24. The slag discharge port 4 is communicated with the precipitation and separation device 8 through the slag discharge pipe 71. The slag liquid, that is, the liquid ash slag, is formed by the combustion of the liquid slag removal boiler 1. The liquid ash slag enters the precipitation and separation device 8 through the slag discharge pipe 71. Then, water is added into the precipitation and separation device 8. The liquid ash slag reacts with water and cools to generate an alkaline precipitate. The precipitate is separated by the precipitation and separation device 8 and then sent into the powder-making mechanism 21. The powder-making mechanism 21 is provided with a feeding port. Potassium carbonate and water are added through the feeding port. The mass ratio of the precipitate, potassium carbonate and water is 2:2:1. K 2 O and CaO are indirectly introduced through the cooperation of potassium carbonate, water and the alkaline precipitate. The doping mass fraction of K 2 O is 2.0%, and the doping mass fraction of CaO is 2.0%. Then, the batch material is added and ball-milled in the powder-making mechanism 21. After ball-milling, it is screened through a sieve with a pore size of 0.20 mm to obtain the preform. The wet blank formed by hot pressing through the shaping and hot-pressing mechanism 22 is dried at 130 °C for 3 h by the drying mechanism 23 to form a dry blank, and then sent to the calcining mechanism 24. The calcining mechanism 24 performs sintering at 1060 °C, 1080 °C, 1100 °C or 1140 °C through the temperature of the ash slag waste heat to obtain the composite ceramic material.

[0051] Example 3

[0052] A method for preparing composite ceramic materials using the ash and slag of a liquid slagging boiler, as Figure 1 shown, includes the following steps:

[0053] S1. Weigh each component of the batch mixture: 2.0% bauxite, 3.0% recycled material, 6.3% Beiliu stone powder, 2.7% Wuhu stone powder, 25.0% Tengxian stone powder, 24.2% Tengxian high-sodium stone powder, 3.0% bentonite, 3.0% high-strength bentonite, 2.8% magnesia soil, 1.5% white potassium sand, 6.0% Jiate clay, 1.0% Lixiu clay, 3.0% Tangbu clay, 4.5% mud paste, 12.0% high-aluminum clay, totaling 100%;

[0054] S2. Pass pulverized coal gas into the liquid slagging boiler 1. The bottom of the liquid slagging boiler 1 is provided with a slag flow port 4 and a slag hopper 9. The slag flow port 4 is located within the slag hopper 9. The slag hopper 9 is connected to the calcining mechanism 24. The waste heat of the ash and slag generated by the slag hopper 9 is received by the calcining mechanism 24. The slag flow port 4 is connected to the precipitation separation device 8 through a slag discharge pipe 71. The combustion in the liquid slagging boiler 1 forms slag liquid, i.e., liquid ash and slag. The liquid ash and slag enter the precipitation separation device 8 through the slag discharge pipe 71. Then, water is added to the precipitation separation device 8. The liquid ash and slag react with water and cool to generate alkaline precipitates. The precipitates are separated by the precipitation separation device 8 and then sent into the powder making mechanism 21. The powder making mechanism 21 is provided with a feeding port. Potassium carbonate and water are added through the feeding port. The mass ratio of the precipitate, potassium carbonate, and water is 2:2:1. K 2 O and CaO are indirectly introduced through the cooperation of potassium carbonate, water, and the alkaline precipitate. The doping mass fraction of K 2 O is 3.0%, and the doping mass fraction of CaO is 3.0%. Then, the batch mixture is added, and ball milling is carried out in the powder making mechanism 21. After ball milling, it is then screened through a sieve mesh with a pore size of 0.20 mm to obtain a prefabricated material. The wet blank is hot-pressed and formed by the plastic hot-pressing mechanism 22, and is dried at 130 °C for 3 h by the drying mechanism 23 to form a dry blank, and then sent into the calcining mechanism 24. The calcining mechanism 24 is sintered at 1060 °C, 1080 °C, 1100 °C, or 1140 °C according to the temperature of the waste heat of the ash and slag to obtain the composite ceramic material.

[0055] Figure 2 This is the influence of the doping amounts of different basic oxides in Examples 1 - 3 of the present invention on the water absorption rate of the composite ceramic samples, Figure 2 where (a) shows different doping amounts of K 2 O, and (b) shows different doping amounts of CaO. As Figure 2 shown. As Figure 2As can be seen from (a) in [reference], with the increase of sintering temperature, the water absorption rate of the composite ceramic decreases and then tends to 0. With the increase of the addition amount, the water absorption rate first decreases and then increases. This is mainly because when the mass fraction of K 2 O doped in the ceramic is 1.0%, as the sintering temperature rises to 1080 °C, the amount of molten liquid phase inside the composite ceramic can just fill the pores of the ceramic, so the water absorption rate is close to 0. When the sintering temperature rises to 1140 °C, the water absorption rate remains unchanged. The reason is that the sintering range of the K 2 O composite ceramic is wide. At this time, a small amount of small pores appear inside the composite ceramic, and the molten liquid phase wraps these pores to form closed pores, making the surface dense and non-absorbent. As the mass fraction of K 2 O increases to 2.0%, the amount of molten liquid phase appearing inside increases, and the liquid phase quickly wraps the pores that have not been discharged, forming closed pores inside. The densification degree of the surface of the composite ceramic is strong, and the water absorption rate of the composite ceramic decreases. When the mass fraction of K 2 O increases to 3.0%, the amount of liquid phase increases again, resulting in an increase in internal pressure, causing some of the closed pores inside the ceramic to be broken through to form open pores, and the surface densification degree is poor, so the water absorption rate of the composite ceramic increases. As can be seen from Figure 2 (b), the change law of the water absorption rate of the CaO composite ceramic at different sintering temperatures is similar to that of the K 2 O composite ceramic, indicating that when 1.0% K 2 O and CaO are doped in the ceramic, when sintered at 1080 °C, the basic pores of the composite ceramic are very few and the water absorption rate is close to 0.

[0056] In summary, the method for preparing composite ceramic materials using the slag of a liquid slag removal boiler provided by the present invention can reduce the total amount of solid waste emissions from power plants, effectively utilize the process products such as steam, pressurized air, electric energy, and circulating water produced by the power plant boilers themselves, further clarify the components and proportions of the molten slag, so as to reduce the total amount of solid waste emissions from power plants, effectively utilize the waste heat of the slag liquid and the molten slag, and use the equipment of the boiler itself to convert the solid waste of the power plant itself into industrial products, improving energy utilization efficiency, reducing the solid waste emissions of the power plant, reducing pollutant emissions, and increasing the economic benefits and social benefits of the power plant. In the process of preparing the composite ceramic materials, alkaline precipitates are formed using the slag liquid, indirectly introducing alkaline oxides such as K 2 O and CaO. The incorporation of alkaline substances in the slag reduces the temperature at which the eutectic molten liquid phase of the ceramic appears, plays a role of fluxing and catalyzing, increases the amount of liquid phase in the composite ceramic, promotes the sintering temperature of the ceramic to be reduced from 1200 °C to 1080 °C, and effectively utilizes the waste heat of the slag liquid, realizing energy conservation, emission reduction and low-carbon sintering in ceramic production.

[0057] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn of the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention.

[0058] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A method for preparing composite ceramic material using liquid slag discharge boiler ash slag, characterized in that The following steps are involved: The slag liquid of the liquid slag discharge boiler (1) is separated by a precipitation separation device (8) to obtain a precipitate, which is then fed into a porcelain making system (2), potassium carbonate and water are added to form a co-catalyst and a base material, and then a compound material is added to obtain a composite material. In the porcelain making system (2), the slag liquid of the liquid slag discharge boiler (1) is sintered at 1030-1080° C. under normal pressure to obtain a composite ceramic material, wherein the compound material comprises the following components by mass fraction: 5-8% mineral soil, 55-60% stone powder, 5-8% bentonite, and 25-28% clay, totaling 100%.

2. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 1, characterized in that, The mass ratio of the precipitate, potassium carbonate and water is 2:2:

1.

3. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 1, characterized in that, The mass ratio of the base material and the mixing material is 1.2:

1.

4. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 1, characterized in that, The liquid slag discharge boiler (1) is provided with a slag flow port (4), and the feed port of the sedimentation separation device (8) is connected to the slag flow port (4). The slag liquid discharged from the slag flow port (4) reacts with water and is separated by sedimentation to obtain a precipitate. The discharge port of the sedimentation separation device (8) is connected to the feed port of the porcelain making system (2).

5. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 2, characterized in that, The liquid slag discharge boiler (1) is provided with a slag hopper (9), the slag flow port (4) is located in the slag hopper (9), and the porcelain making system (2) is connected to the slag hopper (9) to directly receive the waste heat of the slag liquid with a temperature of 1030-1080°C.

6. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 3, characterized in that, The porcelain making system (2) comprises a powder making mechanism (21), a molding hot pressing mechanism (22), a drying mechanism (23) and a calcining mechanism (24), wherein the feed port of the powder making mechanism (21) is connected to the discharge port of the sedimentation separation device (8), the discharge port of the powder making mechanism (21) is connected to the molding hot pressing mechanism (22), the molding hot pressing mechanism (22) is also connected to the drying mechanism (23), the drying mechanism (23) is connected to the calcining mechanism (24), and the calcining mechanism (24) is connected to the slag hopper (9) to directly receive the ash waste heat with a temperature of 1030-1080°C.

7. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 5, characterized in that, The liquid slag discharge boiler (1) also includes a liquid slag discharge system (5), and the liquid slag discharge system (5) includes an overflow funnel (6) and a blowing pipe (7). One end of the blowing pipe (7) passes through the slag hopper (9), and the passing part is provided with an overflow funnel (6). The overflow funnel (6) is located below the slag flow port (4), and is located on the side of the slag flow port (4). A slag discharge pipe (71) is also connected to the blowing pipe (7), and the slag discharge pipe (71) is connected to the feed port of the sedimentation separation device (8).

8. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 6, characterized in that, The blowing pipe (7) is provided with a flow rate and temperature measuring device, and the blowing medium is water.

9. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 7, characterized in that, A burner (3) is provided on the liquid slag discharge boiler (1), and a coal powder gas flow is introduced into the liquid slag discharge boiler (1). The coal powder gas flow is burned by the burner (3) and then enters the liquid slag discharge boiler (1). Slag liquid is formed by the combustion of the liquid slag discharge boiler (1). The slag liquid enters a precipitation separation device (8) through a slag flow port (4) and a slag discharge pipe (71). At the same time, a spraying medium enters the precipitation separation device (8) through a spraying pipe (7). The slag liquid reacts with the spraying medium and is precipitated and separated to obtain a precipitate. The precipitate and the batch material are ball-milled and sieved to obtain a composite material through a powder making mechanism (21). A wet blank is obtained by hot pressing in a molding hot pressing mechanism (22). After drying in a drying device (23), the slag liquid of the liquid slag discharge boiler (1) is sintered at normal pressure at 1030-1080° C. in a calcining mechanism (24) using the residual heat of the slag liquid to obtain a composite ceramic material.

10. The method of preparing composite ceramic material using liquid slag discharge boiler ash slag according to claim 1, characterized in that, Mineral soil is one or more combinations of bauxite, magnesium soil, and white potassium sand soil.

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