CN107056236B - Method for preparing ceramic brick with air purification function and compound fertilizer by using sludge - Google Patents
Method for preparing ceramic brick with air purification function and compound fertilizer by using sludge Download PDFInfo
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Abstract
A method for preparing ceramic tiles with air purification function and compound fertilizers by using sludge comprises the following steps: adding calcium superphosphate, diatomite, nano calcium titanate and hydrogen peroxide into the residual sludge, uniformly stirring, heating, spraying and adding a mixed acid solution containing nano calcium titanate at zero degree, and separating to obtain a solid A and a liquid A; soaking the solid A in water, and adjusting the pH value to obtain a liquid B and a solid B; mixing the liquid A and the liquid B, stirring for reaction, and adjusting the pH value to obtain a solid C and a liquid C; adding a catalyst into the liquid C, stirring for reaction under light irradiation, and separating to obtain a solid D and a compound fertilizer; mixing the solid B and the solid C, ball-milling to prepare a mud blank, and performing pressure forming and drying to obtain a ceramic tile blank; and dispersing the solid D in an alkali solution, dip-coating the solid D on the surface of the ceramic mud blank, and calcining to obtain the ceramic tile. The method has the advantages that all the components in the sludge are utilized, no secondary pollution is caused, and the prepared tile brick and compound fertilizer with the air purifying function have low cost.
Description
Technical Field
The invention belongs to the technical field of environment, and particularly relates to a method for preparing ceramic tiles and compound fertilizers with air purification functions by using sludge.
Background
The treatment of sludge has been a difficult problem in the water treatment industry. At present, the treatment methods of the excess sludge mainly comprise methods of land utilization, sanitary landfill, incineration and the like. Some of the methods have potential environmental safety hazards and some have high cost. The sludge contains a large amount of organic matters which are mainly biological residues and are rich in protein, copper, zinc, iron and other metal elements, and many components in the organic matters are precious resources. Therefore, the comprehensive utilization method of the sludge is actively discussed, the waste is changed into the valuable, and the sludge is the best way for sludge disposal. However, the sludge contains a large amount of harmful substances such as heavy metals, and the sludge must be purified to remove the harmful substances.
Air pollution has become a global problem, and harmful substances such as formaldehyde, benzene series, particulate matters, heavy metals and the like in the air can enter human bodies along with the respiration of people and the skin no matter indoors or outdoors, so that the human health is seriously harmed. In order to treat air pollution, a plurality of air purifying products such as air purifiers, purifying tiles and the like are developed, but most of the air purifiers have high cost and unsatisfactory purifying effect.
The production of ceramic tiles and floor tiles by using sludge is reported, the dried sludge powder and kaolin are mixed and fired into the sludge floor tiles by a conventional method in the Li Shu and the like (Li Shu, Weeku, Xianmin, sludge in sewage plants for manufacturing floor tiles and the performance thereof, silicate bulletin, 2007,35 (2): 251-254); glalan and the like (glalan, melting down of the melting. Although the methods basically meet the standard requirements of floor tiles and ceramic tiles and simultaneously solidify heavy metals in sludge in a certain proportion, the methods have the following problems: 1. the addition amount of the sludge is limited, and a large amount of clay, kaolin and other binding materials are needed; 2. useful substances in the sludge, including organic matters such as protein, cellulose and lignin, and nutrient elements such as nitrogen, phosphorus and potassium are not extracted and are all burnt, so that energy is consumed, the atmosphere is polluted, and the quality of the brick is influenced; 3. the existing method only prepares common bricks, has no special function, and has low economic benefit and environmental benefit.
The invention discloses a method for preparing ceramic tiles and compound fertilizers with air purification functions by utilizing excess sludge, aiming at safely and comprehensively utilizing the excess sludge of urban sewage treatment plants, reducing the preparation cost of air purification ceramic materials and simultaneously obtaining compound fertilizers.
Disclosure of Invention
The invention aims to provide a method for preparing ceramic tiles with air purification function and compound fertilizers by using sludge. All components of the sludge in the method are utilized, no secondary pollution is caused, and the prepared ceramic tile with the air purifying function has low cost and high environmental benefit and economic benefit.
The technical scheme is as follows:
a method for preparing ceramic tiles with air purification function and compound fertilizers by using sludge is characterized by comprising the following steps:
1) taking fresh excess sludge, adjusting the water content to 80-88%, adding 5-10% of calcium superphosphate, 10-30% of diatomite, 0.1-1% of nano calcium titanate and 5-10% of hydrogen peroxide by mass percentage of the sludge, uniformly stirring, and heating to slightly boil for 10-20 min; simultaneously, taking a mixed acid solution containing 0.1-0.5mol/L of sulfuric acid and 0.2-1mol/L of nitric acid according to the volume ratio of the sludge mass to the acid solution of 1Kg to 1L, adding nano calcium titanate powder with 0.1% of the sludge mass, uniformly mixing and dispersing to prepare a suspension of nano calcium titanate-mixed acid, freezing to 0 ℃, spraying into the slightly boiling sludge liquid by a high-pressure spray gun at the liquid flow speed of 50-200m/s, uniformly spraying and stirring, and performing solid-liquid separation to obtain a solid A and a liquid A;
2) adding water into the solid A obtained in the step (1) until the solid is just completely immersed, uniformly stirring, adjusting the pH value to 11-12 by using a potassium hydroxide solution, heating to 80-90 ℃, soaking for 1h, supplementing the potassium hydroxide solution to keep the pH value of the mixed feed liquid between 11-12, and performing solid-liquid separation to obtain a liquid B and a solid B;
3) mixing the liquid A obtained in the step 1 and the liquid B obtained in the step 2, stirring for completely reacting, adjusting the pH value of the solution to 6-8 by using alkali, standing for 18-24h, and performing solid-liquid separation to obtain a solid C and a liquid C;
4) adding nano calcium titanate powder accounting for 0.5 percent of the mass of the liquid C and nano bismuth vanadate powder accounting for 0-0.5 percent of the mass of the liquid C into the liquid C obtained in the step 3, stirring and reacting for 90-120 min under the irradiation of ultraviolet light, and carrying out solid-liquid separation to obtain solid D and a compound fertilizer;
5) mixing the solid B obtained in the step 2 and the solid C obtained in the step 3, drying at 120 ℃, ball-milling for 6-8h, uniformly mixing, sieving with a 325-mesh sieve, adding water for wetting, refining mud to prepare a mud blank, adding 20-30MPa pressure in a mould for molding to prepare a blank with a certain specification and shape, and drying at 60-90 ℃ to obtain a ceramic mud blank;
6) dispersing the solid D obtained in the step 4 in a solution of potassium hydroxide and sodium hydroxide with the pH value of 11-14 in any proportion by using ultrasonic waves to obtain a suspension D;
7) and (4) dip-coating the suspension D obtained in the step (6) on the surface of the ceramic mud blank prepared in the step (5), drying at 60-90 ℃, and calcining at 1000-1400 ℃ for 2-5 hours to obtain the ceramic tile with the air purification function.
The sludge is excess sludge discharged by an urban domestic sewage treatment plant.
And 3, the alkali used in the pH value adjustment in the step 3 is aqueous solution of potassium hydroxide, calcium hydroxide and ammonia water in any proportion.
The ultraviolet wavelength used in the light irradiation in the step 4 is 254nm, and the irradiation intensity is not less than 100 mu W/cm2。
The compound fertilizer obtained in the step 4 can be directly used as a liquid fertilizer, and can also be prepared into a solid organic-inorganic compound fertilizer after spray drying and granulation.
The invention has the advantages that:
the invention utilizes catalytic oxidation, adsorption and cold high-pressure nano particle-acid spraying technology to treat sludge, extracts useful substances in the sludge to prepare compound fertilizer, and prepares ceramic with air purification function by calcining, decomposing and curing harmful substances such as heavy metal and the like; the method has the advantages that all components in the sludge are utilized, no secondary pollution is caused, and the cost of the prepared ceramic tile with the air purifying function is low. Has high environmental benefit and economic benefit.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The nano calcium titanate powder used in the embodiment of the invention is synthesized by the laboratory according to the method of the literature (Zhangdong, Houping, preparation of nano calcium titanate powder and adsorption behavior [ J ] of nano calcium titanate powder to lead and cadmium in water, 2009, (12): 1336-1342); the nano bismuth vanadate powder is synthesized by a laboratory according to a method of a document (Zhangong, et al, a synthetic method of a high-activity N-F co-doped bismuth vanadate visible light photocatalytic material, invention patent ZL 201210105621.7).
Example 1
Taking 2Kg of fresh excess sludge with the water content of 81%, adding 200g of calcium superphosphate, 400g of diatomite, 10g of nano calcium titanate and 200g of hydrogen peroxide with the mass percentage of 30%, uniformly stirring, and heating to keep micro boiling for 20 min; simultaneously, taking 2L of mixed acid solution of sulfuric acid with the concentration content of 0.25mol/L and nitric acid with the concentration content of 0.5mol/L, adding 2g of nano calcium titanate powder, stirring and mixing, uniformly dispersing, freezing to 0 ℃, spraying into the slightly-boiling sludge material liquid by using a high-pressure spray gun at the liquid flow velocity of 100m/s, uniformly spraying and stirring, and carrying out suction filtration to obtain a solid A and a liquid A; adding water into the solid A obtained in the step 1 until the solid A is just completely immersed, uniformly stirring, adjusting the pH value of the solution to 11 by using potassium hydroxide, heating to 80 ℃, preserving heat, soaking for 1h, supplementing the potassium hydroxide to keep the pH value of the solution at 11, performing suction filtration, and performing solid-liquid separation to obtain liquid B and solid B; mixing the liquid A and the liquid B, stirring for completely reacting, adjusting the pH value of the solution to 6 by using potassium hydroxide, standing for 24 hours, carrying out suction filtration, and carrying out solid-liquid separation to obtain a solid C and a liquid C; adding nano calcium titanate powder 0.5% and nano bismuth vanadate powder 0.2% of the liquid C in the liquid C, and placing at 100 μ W/cm2Carrying out irradiation stirring reaction for 120min under ultraviolet light, centrifuging for 20min at 4000r/min by using a centrifugal machine, separating to obtain a solid D and a liquid compound fertilizer, and carrying out spray drying on the liquid compound fertilizer to obtain a solid compound fertilizer 1; mixing the solid B and the solid C, drying at 120 ℃, ball-milling for 6h, sieving with a 325-mesh sieve, adding water for wetting, refining mud, preparing a mud blank with moderate hardness, pressurizing in a mould at 30MPa for molding, preparing a brick blank with the length and width of 150 multiplied by 12.5mm, and drying at 80 ℃ to obtain a ceramic brick mud blank; and dispersing the solid D in a potassium hydroxide solution with the pH value of 11 by using ultrasonic waves to obtain a suspension D, dip-coating the suspension D on the surface of the ceramic brick mud blank, drying at 80 ℃, and calcining at 1250 ℃ for 3 hours to obtain the ceramic brick 1 with the air purification function.
Example 2
Taking 2Kg of fresh excess sludge with the water content of 88%, adding 200g of calcium superphosphate, 200g of diatomite, 2g of nano calcium titanate and 100g of hydrogen peroxide with the mass percentage of 30%, uniformly stirring, and heating to keep micro boiling for 20 min; simultaneously, 0.1mol/L sulfuric acid and 0.2mol of sulfuric acid are taken2L of nitric acid mixed acid solution of/L, adding 2g of nano calcium titanate powder, stirring and mixing, uniformly dispersing, freezing to 0 ℃, spraying into the slightly boiling sludge liquid by using a high-pressure spray gun at the liquid flow speed of 50m/s, uniformly spraying and stirring, performing suction filtration, and performing solid-liquid separation to obtain a solid A and a liquid A; adding water into the solid A obtained in the step 1 until the solid A is just completely immersed, uniformly stirring, adjusting the pH value of the solution to 12 by using potassium hydroxide, heating to 90 ℃, preserving heat, soaking for 1h, supplementing the potassium hydroxide to keep the pH value of the solution at 12, performing suction filtration, and performing solid-liquid separation to obtain liquid B and solid B; mixing the liquid A and the liquid B, stirring for completely reacting, adjusting the pH value of the solution to 8 by using potassium hydroxide, standing for 18h, performing suction filtration, and performing solid-liquid separation to obtain a solid C and a liquid C; adding nano calcium titanate powder 0.5% and nano bismuth vanadate powder 0.1% of the liquid C in the liquid C, and placing at 100 μ W/cm2Carrying out irradiation stirring reaction for 120min under ultraviolet light, centrifuging for 20min at 4000r/min by using a centrifugal machine, and separating to obtain a solid D and a liquid compound fertilizer 2; mixing the solid B and the solid C, drying at 120 ℃, ball-milling for 8h, sieving with a 325-mesh sieve, adding water for wetting, refining mud, preparing a mud blank with moderate hardness, adding 20MPa pressure in a mould for molding, preparing a brick blank with the length and width of 150 multiplied by 12.5mm, and drying at 60 ℃ to obtain a ceramic brick mud blank; and dispersing the solid D in a potassium hydroxide solution with the pH value of 14 by using ultrasonic waves to obtain a suspension D, dip-coating the suspension D on the surface of the ceramic mud blank, drying at 90 ℃, and calcining at 1000 ℃ for 5 hours to obtain the ceramic tile 2 with the air purification function.
Example 3
Taking 2Kg of fresh excess sludge with the water content of 80%, adding 100g of calcium superphosphate, 600g of diatomite, 20g of nano calcium titanate and 200g of hydrogen peroxide with the mass percentage of 30%, uniformly stirring, and heating to keep micro boiling for 10 min; simultaneously, taking 2L of mixed acid solution of sulfuric acid with the concentration content of 0.5mol/L and nitric acid with the concentration content of 1mol/L, adding 2g of nano calcium titanate powder, stirring, mixing, dispersing uniformly, freezing to 0 ℃, spraying into the slightly-boiling sludge feed liquid by using a high-pressure spray gun at the flow velocity of 200m/s, spraying, stirring uniformly, filtering, and carrying out solid-liquid separation to obtain a solid A and a liquid A; adding water into the solid A obtained in the step 1 until the solid A is just completely immersed, stirring uniformly, and using oxyhydrogenDissolving potassium to adjust the pH value of the solution to 11.2, heating to 85 ℃, preserving heat, soaking for 1h, supplementing potassium hydroxide to keep the pH value of the solution at 11.2, performing suction filtration, and performing solid-liquid separation to obtain liquid B and solid B; mixing the liquid A and the liquid B, stirring for completely reacting, adjusting the pH value of the solution to 8 by using calcium hydroxide and potassium hydroxide, standing for 20 hours, performing suction filtration, and performing solid-liquid separation to obtain a solid C and a liquid C; adding nano calcium titanate powder 0.5% and nano bismuth vanadate powder 0.5% of the liquid C in the liquid C, and placing at 100 μ W/cm2Carrying out irradiation stirring reaction for 90min under ultraviolet light, centrifuging for 20min at 4000r/min by using a centrifugal machine, separating to obtain a solid D and a liquid compound fertilizer, and carrying out spray drying on the liquid compound fertilizer to obtain a solid compound fertilizer 3; mixing the solid B and the solid C, drying at 120 ℃, ball-milling for 8h, sieving with a 325-mesh sieve, adding water for wetting, refining mud, preparing a mud blank with moderate hardness, adding 25MPa pressure in a mould for molding, preparing a brick blank with the length and width of 150 multiplied by 12.5mm, and drying at 90 ℃ to obtain a ceramic brick mud blank; and dispersing the solid D in a potassium hydroxide solution with the pH value of 14 by using ultrasonic waves to obtain a suspension D, dip-coating the suspension D on the surface of the ceramic brick mud blank, drying at 60 ℃, and calcining at 1100 ℃ for 2h to obtain the ceramic brick 3 with the air purification function.
Example 4
Taking 2Kg of fresh excess sludge with the water content of 85 percent, adding 150g of calcium superphosphate, 500g of diatomite, 5g of nano calcium titanate and 200g of hydrogen peroxide with the mass percentage content of 30 percent, uniformly stirring, heating to keep micro boiling for 20min, simultaneously taking 2L of mixed acid solution of sulfuric acid with the concentration content of 0.5mol/L and nitric acid with the concentration content of 1mol/L, adding 2g of nano calcium titanate powder, stirring, mixing, dispersing uniformly, freezing to 0 ℃, spraying into the micro boiling sludge liquid by using a high-pressure spray gun at the liquid flow speed of 150m/s, uniformly spraying and stirring, carrying out suction filtration, and carrying out solid-liquid separation to obtain a solid A and a liquid A; adding water into the solid A obtained in the step 1 until the solid A is just completely immersed, uniformly stirring, adjusting the pH value of the solution to 11.6 by using potassium hydroxide, heating to 89 ℃, preserving heat, soaking for 1h, supplementing potassium hydroxide to keep the pH value of the solution at 11.6, performing suction filtration, and performing solid-liquid separation to obtain liquid B and solid B; mixing the liquid A and the liquid B, stirring for completely reacting, adjusting the pH value of the solution to 8 by using ammonia water and calcium hydroxide, standing for 24h, filtering,carrying out solid-liquid separation to obtain solid C and liquid C; adding nano calcium titanate powder 0.5% and nano bismuth vanadate powder 0.1% of the liquid C in the liquid C, and placing at 100 μ W/cm2Carrying out irradiation stirring reaction for 100min under ultraviolet light, centrifuging for 20min at 4000r/min by using a centrifugal machine, and separating to obtain a solid D and a liquid compound fertilizer 4; mixing the solid B and the solid C, drying at 120 ℃, ball-milling for 7h, sieving with a 325-mesh sieve, adding water for wetting, refining mud, preparing a mud blank with moderate hardness, adding 30MPa pressure in a mould for molding, preparing a brick blank with the length and width of 150 multiplied by 12.5mm, and drying at 70 ℃ to obtain a ceramic brick mud blank; and dispersing the solid D in a potassium hydroxide solution with the pH value of 13 by using ultrasonic waves to obtain a suspension D, dip-coating the suspension D on the surface of the ceramic brick mud blank, drying at 85 ℃, and calcining at 1300 ℃ for 2 hours to obtain the ceramic brick 4 with the air purification function.
Example 5
Taking 2Kg of fresh excess sludge with the water content of 80%, adding 200g of calcium superphosphate, 300g of diatomite, 20g of nano calcium titanate and 200g of hydrogen peroxide with the mass percentage content of 30%, uniformly stirring, heating to keep micro boiling for 20min, simultaneously taking 2L of mixed acid solution of sulfuric acid with the concentration content of 0.1mol/L and nitric acid with the concentration content of 1mol/L, adding 2g of nano calcium titanate powder, stirring, mixing, dispersing uniformly, freezing to 0 ℃, spraying into the micro boiling sludge liquid at the liquid flow speed of 180m/s by using a high-pressure spray gun, uniformly spraying and stirring, carrying out suction filtration, and carrying out solid-liquid separation to obtain a solid A and a liquid A; adding water into the solid A obtained in the step 1 until the solid A is just completely immersed, uniformly stirring, adjusting the pH value of the solution to 12 by using potassium hydroxide, heating to 85 ℃, preserving heat, soaking for 1h, supplementing the potassium hydroxide to keep the pH value of the solution at 12, performing suction filtration, and performing solid-liquid separation to obtain liquid B and solid B; mixing the liquid A and the liquid B, stirring for completely reacting, adjusting the pH value of the solution to 7 by using potassium hydroxide, standing for 24 hours, performing suction filtration, and performing solid-liquid separation to obtain a solid C and a liquid C; adding nano calcium titanate powder accounting for 0.5 percent of the mass of the liquid C into the liquid C, and placing the mixture in a position of 100 mu W/cm2Irradiating, stirring and adsorbing for reaction for 120min under ultraviolet light, centrifuging for 20min at 4000r/min by using a centrifugal machine, separating to obtain a solid D and a liquid compound fertilizer, and spray-drying the liquid compound fertilizer to obtain a solid compound fertilizer 5; mixing the solid B and the solid C, drying at 120 ℃, and ball-milling for 8h, sieving with a 325-mesh sieve, adding water for wetting, refining mud, preparing a mud blank with moderate hardness, adding 30MPa pressure in a mould for molding, preparing a brick blank with the length and width of 150 multiplied by 12.5mm, and drying at 80 ℃ to obtain a ceramic brick mud blank; and dispersing the solid D in a potassium hydroxide solution with the pH value of 12 by using ultrasonic waves to obtain a suspension D, dip-coating the suspension D on the surface of the ceramic brick mud blank, drying at 80 ℃, and calcining at 1400 ℃ for 2 hours to obtain the ceramic brick 5 with the air purification function.
Example 6: performance index of compound fertilizer
The solid compound fertilizers obtained in examples 1, 3 and 5 were tested according to the national standard GB 15063-; the liquid compound fertilizers obtained in examples 2 and 4 were tested according to the method and requirements of local standard DB33/699-2008 "quality safety requirements for organic liquid fertilizers and organic-inorganic compound liquid fertilizers", and the indexes are shown in Table 2:
TABLE 1 Compound fertilizer index
TABLE 2 index of liquid fertilizer
The data show that the compound fertilizer prepared according to the embodiments 1-5 basically meets the corresponding standards. The liquid compound fertilizer with insufficient nitrogen can be supplemented by nitrogen fertilizers such as urea and the like.
Example 7: performance index of functional ceramic brick
The tiles obtained in examples 1 to 5 are described in reference to GB/T4100-2006 "ceramic tiles" and GBT 3810.4-2016 "ceramic tile test method part 4: determination of modulus of rupture and breaking Strength "requirements and methods to test breaking Strength and modulus of rupture; the leaching amount of heavy metals in the brick is measured by referring to a GBT 3810.15-2006 method for measuring leaching amounts of lead and cadmium in glazed bricks in part 15 of a ceramic brick test method, and each index is shown in a table 3:
TABLE 3 Performance index of functional ceramic tiles
Undetected
Example 8: purifying performance of functional ceramic tile on formaldehyde in air
According to the standard requirements of JC/T1074-3And placing the sample for 72 hours under the indoor natural light condition, sampling and determining the change of the formaldehyde concentration according to GB/T18883-. The results are shown in Table 4
TABLE 4 purifying performance of the functional ceramic tile for formaldehyde in air
Claims (3)
1. A method for preparing ceramic tiles with air purification function and compound fertilizers by using sludge is characterized by comprising the following steps:
1) taking fresh excess sludge, adjusting the water content to 80-88%, adding 5-10% of calcium superphosphate, 10-30% of diatomite, 0.1-1% of nano calcium titanate and 5-10% of hydrogen peroxide by mass percentage of the sludge, uniformly stirring, and heating to slightly boil for 10-20 min; simultaneously, taking a mixed acid solution containing 0.1-0.5mol/L of sulfuric acid and 0.2-1mol/L of nitric acid according to the volume ratio of the sludge mass to the acid solution of 1Kg to 1L, adding nano calcium titanate powder with 0.1% of the sludge mass, uniformly mixing and dispersing to prepare a suspension of nano calcium titanate-mixed acid, freezing to 0 ℃, spraying into the slightly boiling sludge liquid by a high-pressure spray gun at the liquid flow speed of 50-200m/s, uniformly spraying and stirring, and performing solid-liquid separation to obtain a solid A and a liquid A;
2) adding water into the solid A obtained in the step (1) until the solid is just completely immersed, uniformly stirring, adjusting the pH value to 11-12 by using a potassium hydroxide solution, heating to 80-90 ℃, soaking for 1h, supplementing the potassium hydroxide solution to keep the pH value of the mixed feed liquid between 11-12, and performing solid-liquid separation to obtain a liquid B and a solid B;
3) mixing the liquid A obtained in the step 1 and the liquid B obtained in the step 2, stirring for completely reacting, adjusting the pH value of the solution to 6-8 by using alkali, standing for 18-24h, and performing solid-liquid separation to obtain a solid C and a liquid C;
4) adding nano calcium titanate powder accounting for 0.5 percent of the mass of the liquid C and nano bismuth vanadate powder accounting for 0-0.5 percent of the mass of the liquid C into the liquid C obtained in the step 3, stirring and reacting for 90-120 min under the irradiation of ultraviolet light, and carrying out solid-liquid separation to obtain solid D and a compound fertilizer;
5) mixing the solid B obtained in the step 2 and the solid C obtained in the step 3, drying at 120 ℃, ball-milling for 6-8h, uniformly mixing, sieving with a 325-mesh sieve, adding water for wetting, refining mud to prepare a mud blank, adding 20-30MPa pressure in a mould for molding to prepare a blank with a certain specification and shape, and drying at 60-90 ℃ to obtain a ceramic mud blank;
6) dispersing the solid D obtained in the step 4 in a solution of potassium hydroxide and sodium hydroxide with the pH value of 11-14 in any proportion by using ultrasonic waves to obtain a suspension D;
7) dip-coating the suspension D obtained in the step 6 on the surface of the ceramic mud blank prepared in the step 5, drying at 60-90 ℃, and calcining at 1000-1400 ℃ for 2-5 hours to obtain a ceramic tile with an air purification function;
the sludge is excess sludge discharged by an urban domestic sewage treatment plant.
2. The method for preparing the air purification functional ceramic brick and the compound fertilizer by using the sludge as claimed in claim 1, wherein the alkali used for adjusting the pH value in the step 3 is an aqueous solution of potassium hydroxide, calcium hydroxide and ammonia water in any proportion.
3. The method of claim 1The method for preparing the ceramic brick and the compound fertilizer with the air purification function by using the sludge is characterized in that the wavelength of ultraviolet light used in the light irradiation in the step 4 is 254nm, and the irradiation intensity is not lower than 100 mu W/cm2。
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| CN102976834A (en) * | 2012-12-24 | 2013-03-20 | 南京林业大学 | Method for preparing organic-inorganic compound fertilizer through excess sludge |
| CN104086281A (en) * | 2014-06-10 | 2014-10-08 | 铜陵市银树生态养殖有限责任公司 | A coated tree fertilizer with a slow release function and a preparing method thereof |
| KR20160070040A (en) * | 2016-03-31 | 2016-06-17 | 주식회사 다산컨설턴트 | Ceramic filter for treating contaminated water and the manufacturing method thereof |
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| CN102976834A (en) * | 2012-12-24 | 2013-03-20 | 南京林业大学 | Method for preparing organic-inorganic compound fertilizer through excess sludge |
| CN104086281A (en) * | 2014-06-10 | 2014-10-08 | 铜陵市银树生态养殖有限责任公司 | A coated tree fertilizer with a slow release function and a preparing method thereof |
| KR20160070040A (en) * | 2016-03-31 | 2016-06-17 | 주식회사 다산컨설턴트 | Ceramic filter for treating contaminated water and the manufacturing method thereof |
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