CN102219420B - High calcium fly ash modified sludge, preparation method thereof and method for preparing perforated brick using modified sludge - Google Patents
High calcium fly ash modified sludge, preparation method thereof and method for preparing perforated brick using modified sludge Download PDFInfo
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- CN102219420B CN102219420B CN2011100944372A CN201110094437A CN102219420B CN 102219420 B CN102219420 B CN 102219420B CN 2011100944372 A CN2011100944372 A CN 2011100944372A CN 201110094437 A CN201110094437 A CN 201110094437A CN 102219420 B CN102219420 B CN 102219420B
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention, belonging to the technical field of construction material, environmental protection and resource exploitation, relates to a high calcium fly ash modified sludge, its preparation method, and a method for preparing a perforated brick using the modified sludge. The high calcium fly ash modified sludge is prepared by mixing general waste dewatered sludge with high calcium fly ash, wherein, the high calcium fly ash accounts for 15-30 wt%. The preparation method of the high calcium fly ash modified sludge comprises the following steps: preparing materials, selecting the high calcium fly ash with more than 40% of calcium oxide and the calorific value of more than 1800 calorie/gram and the general solid waste dewatered sludge; mixing the high calcium fly ash and the general solid waste dewatered sludge uniformly according to the water content of the sludge; stacking the uniformly mixed sludge mixture in the principle of minimizing the outer superficial area. The method for preparing a perforated brick by using the high calcium fly ash modified sludge provided by the invention is operated at normal temperature, with the advantages of simple operation, small investment and low operation cost, meeting the conception of circular economy, and is a idealist method for sludge recycling..
Description
Technical field
The invention belongs to material of construction and environment protection technical field of resource utilization, relate to a kind of high calcium flying dust modified sewage sludge, preparation method and utilize it to prepare the method for sintered perforated brick.
Background technology
How the mud that produces in the sewage treatment process is disposed is one of important topic of efforts at environmental protection person's research always.As the mud of general solid waste, it contains a large amount of calorific values, germ and a small amount of heavy metal, and this class mud is to produce in the lives such as municipal effluent, dyeing waste water, paper waste and the During Industrial Wastewater Treatment Process.If sludge disposal is improper, the pollutent of originally separating from sewage can be got back in the environment with various forms again and go, and causes secondary pollution, and the sewage works of investment construction and operation and Sewage Plant have also just been lost original meaning.And along with the quickening of urbanization process, the continuous increase of sewage generation causes the dewatered sludge amount to grow with each passing day, and how disposing sludge has become pressing issues.At present main method of disposal has the modes such as sanitary landfill, compost are agricultural, burning.The principle that sludge disposal is followed is " innoxious, minimizing, resource utilization ", and wherein " resource utilization " is ideal target, meets the theory of recycling economy, is one of of paramount importance direction of its resource utilization and utilize making brick from sludge.
As everyone knows, dewatered sludge is because that water ratio is high, calorific value is low etc. is former thereby can't be directly used in making brick from sludge.Chinese scholars has been done a large amount of research to making brick from sludge, the technology such as existing " utilizing municipal sludge and wet-discharged coal ash to produce the method for light high strength sintered brick ", " technology of municipal sludge energy-saving brick processed ", " mud blending clay-brickmaking ", " mud gather leaves of a book rock sintered perforated brick ", but these technology are not done deep research to the modification of mud, or the method for modified sewage sludge is complicated, cost is high, has great difficulty in the practical application.Application number provides a kind of preparation method of vitrified brick for 200510012745.0 Chinese patent application, this preparation method's concrete technology step is: get the raw materials ready, choose burning inadequate coal ash, clay and water, the weight ratio of each component is during batching: coal ash 115-145: clay 2365-2375: water 1000-1500, pulverize, it is below 5 millimeters that the sufficient coal ash of the unburn of collecting is made powder particle diameter by pulverizer, stir, enter the brick press extrusion molding, then enter brick cutting machine and make adobe, drying, roasting are made for finished product again.But this invention does not provide any enlightenment for the utilization of mud, and if common coal ash mixed with mud, the proterties of mud does not have the change of essence, only can utilize seldom even can't utilize mud to carry out brickmaking.
Summary of the invention
The mud that can't effectively utilize that the present invention is directed to prior art comes the defective of brickmaking that a kind of high calcium flying dust modified sewage sludge is provided, the high calcium flying dust that this modified sewage sludge is higher with calorific value mixes with mechanical dehydration mud, can be used for the production of sintered perforated brick, mud after the modification has the advantages that water ratio is low, calorific value is high, very easily mixes thoroughly with other earth.
The present invention also provides the preparation method of described high calcium flying dust modified sewage sludge.
The present invention also provides a kind of and utilizes described high calcium flying dust modified sewage sludge to prepare the method for sintered perforated brick, owing to having adopted high calcium flying dust modified sewage sludge provided by the invention, therefore realized the goal of the invention of normal temperature brickmaking, easy to operation, cost is low, and modified sewage sludge and brickmaking is mixed after the adobe without airing with earth, can directly enter tunnel furnace and fire rear one-tenth brick.Use this method brickmaking, not only save coal, and the brick quality of making is light, intensity is high, insulation and soundproof effect are good, have broad application prospects.
Above-mentioned technical problem of the present invention is implemented by the following technical programs:
A kind of high calcium flying dust modified sewage sludge, it is to be mixed by the dewatered sludge of general solid waste and high calcium flying dust, wherein the high calcium flying dust accounts for 15-30 wt %.The purpose of modified sewage sludge is for water cut, improves calorific value, increases diversity, for follow-up brickmaking creates conditions.For reaching this purpose, the main employing dried (heat energy), pressurization highly energy-consuming technology such as (mechanical energy) at present, and the present invention utilizes chemical energy, and the high calcium flying dust is had strict demand, need to screen the high calcium flying dust.The high calcium flying dust of utilization of the present invention refers to that heat power plant adopts that cloth bag or electrostatic dust removing method produce contains the flying dust of calcium oxide more than 40%, and the main component of this flying dust is the high oxide of calcium oxide, silicon-dioxide and aluminium, iron, calcium, magnesium.
As preferably, described high calcium flying dust contains calcium oxide more than 40%, calorific value greater than 1800 cards/gram.
A kind of preparation method of described high calcium flying dust modified sewage sludge, it may further comprise the steps:
A, get the raw materials ready, choose and contain calcium oxide more than 40%, calorific value greater than the high calcium flying dusts of 1800 cards/gram, and the dewatered sludge of general solid waste;
B, according to the water ratio of mud, high calcium flying dust and the dewatered sludge of 15-30 wt % mixed;
C, the mud mixture after mixing thoroughly are stacked take the outer surface area minimum as principle, and pilling up time is 3-7 days, when mud mixture becomes loose fine-grannular, modification was finished when water ratio was lower than 50%.
The ground, mud mixture visual field of mixing thoroughly is stacked take the outer surface area minimum as principle, and stacking the place should indoor, require the well-ventilated.According to weather condition, pilling up time is 3-7 days.Mud mixture becomes loose fine-grannular, when water ratio is lower than 50%, can think that modification finishes.
As preferably, the mixing time in the B step was less than or equal to 1 hour.When the high calcium flying dust mixed with dewatered sludge, The faster the better for speed under uniform prerequisite, and mixing time is not generally above 1 hour.If overlong time surpasses 1 hour, heat will scatter and disappear very fast, not only seriously restrict pilling up time, and will directly affect the effect of modification.
A kind ofly utilize described high calcium flying dust modified sewage sludge to prepare the method for sintered perforated brick, its concrete steps are: described modified sewage sludge is mixed with earth with brickmaking, wherein modified sewage sludge accounts for 30-50 wt %, make base after the mixing, do not need airing under the room temperature, directly enter tunnel furnace and fire, can produce the finished product sintered perforated brick.The method of firing adopts the used firing temperature of conventional brickmaking and method, generally is that every batch of brick is 7.0-7.5 hour from advancing kiln to the kiln discharge sintering time, and kiln temperature is prior art from 400 ℃ → 1000 ℃ → 300 ℃.With the mixing than at 30-50% of earth, main determining factor is in the character of modified sewage sludge with brickmaking for mud after the modification.Because the sludge calorific value after the modification is high, uses this method brickmaking, not only save coal, and the brick quality of making is light, intensity is high, insulation and soundproof effect are good, have broad application prospects.The content of modified sewage sludge is looked the character of primary sludge, if its organic content is higher, the accounting of mud is less after the modification, but can reach more than 30% at least.
The present invention screens the high calcium flying dust as leading indicator with calcium content and calorific value, the high calcium flying dust after choosing is looked the proterties of mud and is mixed into dewatered sludge with the ratio of 15-30 wt %, mixes, and mixes thoroughly to stack after 3-7 days under the rear normal temperature to obtain modified sewage sludge; The mud of modification is mixed and made into adobe with ratio and the brick clay of 30-50 wt % again, and this adobe does not need airing, and directly entering heats behind the tunnel furnace makes sintered perforated brick.Use this method brickmaking, owing to contain the calorific value material, thus can save coal, and the brick quality of making is light, intensity is high, and insulation and soundproof effect are good.The method all operations that utilizes described high calcium flying dust modified sewage sludge to prepare sintered perforated brick provided by the invention all carries out at normal temperatures, and is simple and convenient, less investment, and working cost is low, meets the theory of recycling economy fully, is the optimal method of recycling sludge.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below be specific embodiments of the invention; These embodiment can do further to replenish and explanation to the present invention; But the present invention is not limited to these embodiment.
Employed technology in following examples unless stated otherwise, is routine techniques known to those skilled in the art; Employed plant and instrument, reagent etc., only this specification sheets specifies, is that the research of this area and technician can be by public approach acquisition.
As shown in Figure 1, at first allow the high calcium flying dust mix with dewatered sludge, mixed mud is stacked.In the well-mixed mud stacking process, the thermopositive reaction of series of physical, chemical reaction occurs under the effect of high calcium flying dust, the moisture of mud is removed, and proterties acquires change.Mud is the mechanical dehydration mud of general solid waste.Modified sewage sludge and common brickmaking by the proportioning blending, are made adobe with earth.Tunnel furnace is put in the adobe of making, and adopts the used firing temperature of conventional brickmaking and method, makes perforated brick.
Embodiment 1:
The high calcium flying dust of selecting comes from Jiaxing power plant, and its calcium oxide content is 44.25%, and calorific value is 1950 cards/gram.Mud is the dewatered sludge that process of paper-making wastewater treatment produces, and comes from paper mill, Jiaxing City Pinghu, and water ratio is 83.5%.Earth is common brick clay.
Weighing 5000kg paper mill sludge, again weighing 750kg high calcium flying dust (the high calcium flying dust accounts for 15 wt %).The two was stirred 30 minutes with mini-excavator, the mud that mixes is placed on the ground of concrete placement, stack into steamed bun shape.For preventing that mound from subsiding, fragment of brick is safeguarded on every side, and the fragment of brick height is 25-30cm.The temperature of stacking is 15-25 ℃.
The mixing sludge of stacking was measured a water ratio in per 24 hours.After 72 hours, water ratio has dropped to 46%, and sludge modification is finished.
Utilize the good above-mentioned mud of modification, the ratio with 48% is mixed it with common brick clay, make adobe after stirring with mini-excavator.Without airing, directly enter tunnel furnace behind the green brick forming, adopt the used firing temperature of conventional brickmaking and method, kiln temperature was fired 7 hours from 400 ℃ → 1000 ℃ → 300 ℃, made sintered perforated brick behind the kiln discharge.
Embodiment 2:
The high calcium flying dust of selecting comes from Jiaxing power plant, and calcium oxide content is 44.25%, and calorific value is 1950 cards/gram.Mud is the dewatered sludge that the treatment of dyeing wastewater process produces, and comes from Jiaxing City Jiashan printing and dyeing mill, and water ratio is 85%.Earth is common brick clay.
Weighing 5000kg printing and dyeing sludge, again weighing 1000kg high calcium flying dust (the high calcium flying dust accounts for 20 wt %).The two was stirred 40 minutes with mini-excavator.The mud that mixes is placed on the ground of concrete placement, stacks into steamed bun shape.For preventing that mound from subsiding, fragment of brick is safeguarded on every side, and the fragment of brick height is 25-30cm.The temperature of stacking is 14-25 ℃.
The mixing sludge of stacking was measured a water ratio in per 24 hours.After 96 hours, water ratio has dropped to 45%, and sludge modification is finished.
Utilize the good above-mentioned mud of modification, the ratio with 40% is mixed it with common brick clay, make adobe after stirring with mini-excavator.Without airing, directly enter tunnel furnace behind the green brick forming, adopt the used firing temperature of conventional brickmaking and method, kiln temperature was fired 7 hours from 400 ℃ → 1000 ℃ → 300 ℃, made sintered perforated brick behind the kiln discharge.
Embodiment 3:
The high calcium flying dust of selecting comes from Shanghai power plant, and calcium oxide content is 43.15%, and calorific value is 2147 cards/gram.Mud is the dewatered sludge that municipal wastewater treatment plant produces, and comes from Jiaxing City Tongxiang municipal wastewater treatment plant, and water ratio is 88%.Earth is common brick clay.
Weighing 5000kg municipal sludge, again weighing 1500kg high calcium flying dust (the high calcium flying dust accounts for 30 wt %).The two was stirred 45 minutes with mini-excavator.The mud that mixes is placed on the ground of concrete placement, stacks into steamed bun shape.For preventing that mound from subsiding, fragment of brick is safeguarded on every side, and the fragment of brick height is 25-30cm.The temperature of stacking is 14-25 ℃.
The mixing sludge of stacking was measured a water ratio in per 24 hours.After 144 hours, water ratio has dropped to 48%, and sludge modification is finished.
Utilize the good above-mentioned mud of modification, the ratio with 30% is mixed it with common brick clay, make adobe after stirring with mini-excavator.Without airing, directly enter tunnel furnace behind the green brick forming, adopt the used firing temperature of conventional brickmaking and method, kiln temperature was fired 7 hours 10 minutes from 400 ℃ → 1000 ℃ → 300 ℃, made sintered perforated brick behind the kiln discharge.
Embodiment 4:
The high calcium flying dust of selecting comes from Shanghai power plant, and calcium oxide content is 43.15%, and calorific value is 2147 cards/gram.Mud is the dewatered sludge that process of paper-making wastewater treatment produces, and comes from paper mill, Jiaxing City Pinghu, and water ratio is 83.5%.Earth is common brick clay.
Weighing 5000kg municipal sludge, again weighing 1500kg high calcium flying dust (the high calcium flying dust accounts for 30wt %).The two was stirred 55 minutes with mini-excavator.The mud that mixes is placed on the ground of concrete placement, stacks into steamed bun shape.For preventing that mound from subsiding, fragment of brick is safeguarded on every side, and the fragment of brick height is 25-30cm.The temperature of stacking is 14-25 ℃.
The mixing sludge of stacking was measured a water ratio in per 24 hours.After 96 hours, water ratio has dropped to 42%, and sludge modification is finished.
Utilize the good above-mentioned mud of modification, the ratio with 50% is mixed it with common brick clay, make adobe after stirring with mini-excavator.Without airing, directly enter tunnel furnace behind the green brick forming, adopt the used firing temperature of conventional brickmaking and method, kiln temperature was fired 7 hours 10 minutes from 400 ℃ → 1000 ℃ → 300 ℃, made sintered perforated brick behind the kiln discharge.
Embodiment 5:
The high calcium flying dust of selecting comes from Jiaxing power plant, and calcium oxide content is 40%, and calorific value is 2050 cards/gram.Mud is the dewatered sludge that process of paper-making wastewater treatment produces, and comes from paper mill, Jiaxing City Pinghu, and water ratio is 83.5%.Earth is common brick clay.
Weighing 5000kg municipal sludge, again weighing 1250kg high calcium flying dust (the high calcium flying dust accounts for 25wt %).The two was stirred 35 minutes with mini-excavator.The mud that mixes is placed on the ground of concrete placement, stacks into steamed bun shape.For preventing that mound from subsiding, fragment of brick is safeguarded on every side, and the fragment of brick height is 25-30cm.The temperature of stacking is 14-25 ℃.
The mixing sludge of stacking was measured a water ratio in per 24 hours.After 144 hours, water ratio has dropped to 45%, and sludge modification is finished.
Utilize the good above-mentioned mud of modification, the ratio with 35% is mixed it with common brick clay, make adobe after stirring with mini-excavator.Without airing, directly enter tunnel furnace behind the green brick forming, adopt the used firing temperature of conventional brickmaking and method, kiln temperature was fired 7 hours 30 minutes from 400 ℃ → 1000 ℃ → 300 ℃, made sintered perforated brick behind the kiln discharge.
The Performance Ratio of the brick that the sintered perforated brick that above each embodiment makes and unselected clay are made sees Table 1.
Table 1 performance comparison table
| Project | The brick that unselected clay is made | The sintered perforated brick that the present invention makes |
| Specification | 240mm×115 mm×90 mm | 240mm×115 mm×90 mm |
| Strength grade (monolithic minimum value) | ≥7.5Mpa | ≥7.5Mpa |
| Monolithic weight | ≥3.05Kg | ≤2.55Kg |
| The monolithic water-intake rate | ≤25% | ≥35% |
| Heat transfer coefficient | 2.4～2.8w/m 2·k | 1.3～1.5 w/m 2·k |
As can be seen from Table 1, the brick light weight that modified sewage sludge is made only have 84% of brick that unselected clay makes, and heat transfer coefficient is little, high insulating effect.
Specific embodiment described in the present invention only is to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although the present invention has been made a detailed description and has quoted as proof some specific exampless, to those skilled in the art, only otherwise it is obvious leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (4)
1. high calcium flying dust modified sewage sludge, it is characterized in that: it is to be mixed by the dewatered sludge of general solid waste and high calcium flying dust, and wherein the high calcium flying dust accounts for 15-30 wt %; Described high calcium flying dust refers to that heat power plant adopts that cloth bag or electrostatic dust removing method produce contains the flying dust of calcium oxide more than 40%, and the main component of this flying dust is the high oxide of calcium oxide, silicon-dioxide and aluminium, iron, calcium, magnesium.
2. the preparation method of a high calcium flying dust modified sewage sludge as claimed in claim 1 is characterized in that may further comprise the steps:
A, get the raw materials ready, choose and contain calcium oxide more than 40%, calorific value greater than the high calcium flying dusts of 1800 cards/gram, and the dewatered sludge of general solid waste;
B, according to the water ratio of mud, high calcium flying dust and the dewatered sludge of 15-30 wt % mixed;
C, the mud mixture after mixing thoroughly are stacked take the outer surface area minimum as principle, and pilling up time is 3-7 days, when mud mixture becomes loose fine-grannular, modification was finished when water ratio was lower than 50%.
3. the preparation method of high calcium flying dust modified sewage sludge according to claim 2 is characterized in that: the mixing time in the B step≤1 hour.
4. one kind is utilized high calcium flying dust modified sewage sludge as claimed in claim 1 to prepare the method for sintered perforated brick, it is characterized in that concrete steps are: described modified sewage sludge is mixed with earth with brickmaking, wherein modified sewage sludge accounts for 30-50 wt %, make base after the mixing, do not need airing under the room temperature, directly enter tunnel furnace and fire, can produce the finished product sintered perforated brick.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102826734A (en) * | 2012-09-05 | 2012-12-19 | 沈阳航空航天大学 | Method for utilizing incineration fly ash as calcium-increasing passivation agent of town sludge |
| CN110950641A (en) * | 2018-09-26 | 2020-04-03 | 广东清大同科环保技术有限公司 | Self-heat-release solid waste based ultralow-density proppant and preparation method thereof |
| CN111499404A (en) * | 2020-04-26 | 2020-08-07 | 中国科学院城市环境研究所 | Method and system for preparing perforated bricks by adopting raw sludge |
| CN111592244B (en) * | 2020-06-02 | 2022-05-20 | 张斌 | Solid waste sludge conversion bonding sintering material |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1408675A (en) * | 2001-09-28 | 2003-04-09 | 韩晓伟 | Sintered brick produced by using paper-making sludge of waste paper and its preparing method |
| CN101503643A (en) * | 2009-03-09 | 2009-08-12 | 上海同济科学技术开发有限公司 | Solid fuel for sludge anhydration |
| CN101746940A (en) * | 2008-12-10 | 2010-06-23 | 清华大学 | Dewatering sludge alkaline type semi-desiccation processing method of sewage treatment plants |
| CN102061210A (en) * | 2011-01-10 | 2011-05-18 | 山鑫科陶科技（北京）股份有限公司 | Method for making biological coal by reaction of fly ash and municipal sludge |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1408675A (en) * | 2001-09-28 | 2003-04-09 | 韩晓伟 | Sintered brick produced by using paper-making sludge of waste paper and its preparing method |
| CN101746940A (en) * | 2008-12-10 | 2010-06-23 | 清华大学 | Dewatering sludge alkaline type semi-desiccation processing method of sewage treatment plants |
| CN101503643A (en) * | 2009-03-09 | 2009-08-12 | 上海同济科学技术开发有限公司 | Solid fuel for sludge anhydration |
| CN102061210A (en) * | 2011-01-10 | 2011-05-18 | 山鑫科陶科技（北京）股份有限公司 | Method for making biological coal by reaction of fly ash and municipal sludge |
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