CN103693943A - Method for firing ceramsite with sludge dehydrated through conditioning - Google Patents
Method for firing ceramsite with sludge dehydrated through conditioning Download PDFInfo
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- CN103693943A CN103693943A CN201310662705.5A CN201310662705A CN103693943A CN 103693943 A CN103693943 A CN 103693943A CN 201310662705 A CN201310662705 A CN 201310662705A CN 103693943 A CN103693943 A CN 103693943A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention relates to a method for firing ceramsite with sludge dehydrated through conditioning, belonging to the technical field of solid waste treatment in environment protection. According to the method, sewage sludge with 99.8% moisture is taken as the raw material, and activated clay, waste gypsum, garden waste, ferric trichloride and aluminum sulfate are taken as conditioning ingredients, the method comprises steps of uniformly mixing the conditioning ingredients with the raw material sequentially according to certain proportion, dehydrating the mixture through centrifuging, drying then directly putting into a pelletizer for moulding, preheating and roasting at specific temperature, cooling down then sieving so as to obtain ceramsite products of different grain sizes. According to the method, the original sludge does not need to be dried, burned or grinded, so that the production cycle is greatly shortened; in firing process, the heat of the sludge and the garden waste is fully used, so that energy consumption is reduced and the resource is saved. The ceramsite prepared by the method has properties of light weight, sound absorption, and good heat insulation effect.
Description
Technical field
The invention belongs to solid waste disposal technical field in field of Environment Protection, what be specifically related to is a kind of processing method of disposal of municipal sludge.
Background technology
Sludge from wastewater treatment plant is the association product of sewage disposal, forms extremely complexity, large, easy corrupt, the foul smelling of volume.Physical properties and changeable, the extremely unsettled chemical propertys such as the high-moisture that mud has and loose particles structure, not only make its treating processes costly, and make its efficient processing still have certain technical difficulty.Therefore, sludge treatment handling problems has become the heavy burden of municipal wastewater treatment plant, even becomes the huge obstacle of the normal operation of some Sewage Plant.The < < urban wastewater treatment firm sludge treatment that China implements for 2009 is disposed and pollution prevention technique policy (trying) > > lay special stress on " sludge treatment facility must put into operation with sewage treatment facility simultaneously ", therefore how reasonably process, disposing sludge, become the problem that municipal wastewater treatment plant and relevant departments must draw attention.Due to the main component of city sewage and sludge and the starting material of clay class more approaching, take that it is made haydite as major ingredient and can realize the minimizing of cities and towns solid waste, innoxious and resource utilization, gradually become sludge treatment in recent years and disposed study hotspot and the developing direction in field.
The pre-treatment of must first dewatering before firing ceramsite by using sludge, reduces the water ratio of mud.Be mainly by effective sludge conditioning at present, improve the dewatering of mud, realize the dehydration of sludge high-drying degree.Just current method for sludge treatment, effective means is by adding chemical agent, to improve the dewatering of mud the most, make mud granule flocculation, structural reinforcing, be beneficial to mechanical dehydration, but excess sludge water ratio after processed that sewage work produces is still higher, substantially maintains 80% left and right, be difficult to meet the requirement that recycling sludge utilizes.Find after deliberation to add physics amendment, as flyash, gypsum, sawdust, wheat bran etc., as " skeleton " of mud flco structure, be considered to effectively to improve the water-permeable of mud, reduce filter cake moisture content.Therefore two kinds of medicament co-conditioning mud are direction and main flows that current sludge conditioning dehydration is studied.Meanwhile, in some physics amendment, contain a large amount of SiO
2, Al
2o
3, MgO, CaO, Na
2o and K
2the compositions such as O.SiO wherein
2, Al
2o
3for haydite forms the primary structure basis of intensity and structure, and appropriate MgO, CaO, Na
2o and K
2the alkaline metal oxides such as O can reduce firing temperature as fusing assistant, expand the temperature range fire, and can prevent that blank from firing middle bonding, increase the generation of expanding gas, are conducive to the expansion of pellet.Filter cake after conditioning dehydration is directly made to raw material ball, can significantly reduce before raw material blending dry, the energy that process of lapping consumes, reduce costs, shorten the production cycle, more can effectively utilize the heat that the inflammable substance in mud produces at sintering procedure, make it really realize resource utilization.
Summary of the invention
The present invention be directed to deficiency of the prior art, a kind of method of effective processing, disposal city sewage and sludge is provided, and set up the streamline that a set of recycling sludge utilizes, and for the preparation of a kind of lightweight, the sludge ceramsite that mechanical property is good, production cost is low.
The present invention is achieved through the following technical solutions, specifically comprises the following steps:
(1) proportioning raw materials: the mass percent of sewage sludge, atlapulgite, waste gypsum, vegetalitas garden waste, iron trichloride and Tai-Ace S 150 that the weight of dewatered sludge of take is benchmark is (30%～50%): (20%～40%): (10%～20%): (2%～5%): (3%～7%): (1%～3%);
(2) blending process: by the water ratio of sewage sludge be adjusted to 99.6 ?99.8% be pumped in stirrer, according to the proportioning raw materials described in step (1), first add iron trichloride and Tai-Ace S 150, mix at least after 30min, drop into respectively again atlapulgite, waste gypsum and garden waste powder, stir and make compound;
(3) pressure filtration molding process: the blended stock described in step (2) is delivered in bowl centrifuge and dewatered, by mud cake airing 24～36h that after dehydration, water ratio is 65～70%, when its water ratio is 55～60%, deliver in tablets press, make the raw material ball of particle diameter 8～10mm;
(4) dry and roasting process: raw material ball step (3) Suo Shu is dried to 1～2h at 105 ℃, and dry object, in order to remove the part moisture in pellet, prevents roasting process mesomere; Then raw material ball is sent into preheating and sintering in retort furnace, preheating is for further adjusting the chemical constitution of raw material ball, mainly to reduce the content that burns carbon in swollen front pellet, to reach the best swollen result of burning, setting temperature rise rate is 10～15 ℃/min, and preheating 20～30min at 250～350 ℃, rises to 600 ℃ with identical temperature rise rate afterwards, at 600 ℃, keep 15～20min, adjust temperature rise rate and be rapidly heated to 900～1000 ℃ of constant temperature calcining 10～15min with 30～50 ℃/min;
(5) discharging process of cooling: will take out and be cooled to room temperature after burned haydite furnace cooling to 550 ℃;
(6) screening: by step (5) gained haydite sieve, obtain the product of different-grain diameter.
Described garden waste refers to the vegetable matter such as the discarded showy flowers of herbaceous plants and weeds in shrub lop (intermediate cutting thing), turf-mown thing, fallen leaves, branch, garden and the flower bed producing in green plants nature or maintenance processes.After being dried, pulverized 100 mesh sieves.
Waste gypsum is to be phosphogypsum with the waste residue that phosphate ores and sulfuric acid manufacture phosphoric acid produce.Main component is calcium sulfate, and mass content is more than 80%, and other compositions are the oxide compound of the elements such as silicon, aluminium, iron, magnesium, sodium, potassium, phosphorus, sulphur, titanium, manganese, cerium, carbon, fluorine.
Tai-Ace S 150 is industrial aluminum sulphate, grinds rear mistake 100 mesh sieves.
Sewage sludge water ratio is 99.6-99.8%, is flow-like.
It is raw material that the sewage sludge that water ratio is 99.8% is take in the present invention; atlapulgite, waste gypsum, garden waste, iron trichloride and Tai-Ace S 150 are prepared burden as conditioning; mix with raw material in order in certain proportion; directly send compound centrifuge dehydration, after dry into tablets press moulding; preheating and baking at specific temperature; after cooling, sieve, obtain the ceramic product of different-grain diameter.Compare with the method for traditional sludge baking ceramsite, the present invention, without primary sludge is carried out to mummification, burning or milled processed, has shortened the production cycle greatly, can make full use of the calorific value of mud and garden waste self at sintering procedure, reduce energy consumption, economize on resources.The haydite of the method manufacture has the performances such as lightweight, sound absorption, good effect of heat insulation.The departments such as building, environmental protection, oil, agricultural all tool have been widely used, for example, for concrete high-quality aggregate, green filtering material etc., and technique is simple, with low cost, be applicable to industrial production.
Therefore sewage sludge of the present invention is directly from sewage work's second pond, to discharge, and water ratio is higher, is easy to and nurses one's health batching and mix dehydration, filtrate carries out the simple airing roasting of just can granulating, do not need to dry and grind and humidifying processing, technique is simple, with low cost.Be conducive to the improvement of " three wastes ".
Concrete implementation method
Below by specific embodiment, the present invention is done to concrete introduction, following instance does not form limitation of the invention.
Embodiment 1:
To after sewage sludge conditioning dehydration, prepare a method for haydite, concrete grammar is as follows:
(1) take respectively atlapulgite, waste gypsum, garden waste, iron trichloride and Aluminium Sulphate usp (powder) 400g, 200g, 50g, 30g, 20g, join in a certain order dry weight and be in the sewage sludge of water ratio 99.8% of 300g, it is adding atlapulgite, waste gypsum and garden waste to mix sequentially for first adding iron trichloride and Aluminium Sulphate usp (powder) after stirring 30min.
(2) compound is delivered in bowl centrifuge and dewatered, after dehydration, water ratio is 67%, water ratio after its natural air drying 36h is down to 55% and delivers in tablets press, makes the raw material ball of particle diameter 8～10mm.
(3) air-dry rear raw material ball is dried 1h at 105 ℃.Then send into preheating and sintering in retort furnace, setting temperature rise rate is 8 ℃, and preheating 20min at 250～350 ℃, rises to 600 ℃ with identical temperature rise rate afterwards, at 600 ℃, keep 15min, adjustment temperature rise rate is rapidly heated to 1000 ℃ of constant temperature calcining 10min with the speed of 50 ℃/min.
(4) by taking out and be cooled to room temperature after burned haydite furnace cooling to 550 ℃, after sieving, obtain haydite finished product.
The outward appearance of haydite finished product is the shaggy ball-type solid of Dark grey, tap density be 650 ?740kg/m
3, surface density be 1250 ?1420kg/m
3, cylindrical compress strength is 4.2MPa, water-intake rate be 4.3 ?12.6%.
Embodiment 2
The embodiment of the present embodiment is as different from Example 1: by the amount qualitative change of the atlapulgite taking in step 1, waste gypsum, garden waste, iron trichloride and Aluminium Sulphate usp (powder), be 300g, 200g, 30g, 50g, 20g, join in a certain order respectively dry weight and be in the sewage sludge of water ratio 99.8% of 400g, it is 65% that step 2 mixes the rear water ratio of dehydration, air-dry water ratio through 24h is down to 57%, and other steps and parameter are identical with embodiment 1.
The outward appearance of haydite finished product is the shaggy ball-type solid of beige, tap density be 550 ?650kg/m
3, surface density be 1130 ?1250kg/m
3, cylindrical compress strength is 3.8MPa, water-intake rate be 6.8 ?13.5%.
Embodiment 3
The embodiment of the present embodiment is as different from Example 1: by the amount qualitative change of the atlapulgite taking in step 1, waste gypsum, garden waste, iron trichloride and Aluminium Sulphate usp (powder), be 200g, 200g, 40g, 40g, 20g, join in order respectively dry weight and be in the sewage sludge of water ratio 99.8% of 500g and mix.It is 69% that step 2 mixes the rear water ratio of dehydration, through the air-dry water ratio of 36h, is down to 58%,, other steps and parameter are identical with embodiment 1.
The outward appearance of haydite finished product is the shaggy ball-type solid of Vandyke brown, tap density be 500 ?600kg/m
3, surface density be 1270 ?1350kg/m
3, cylindrical compress strength is 3.3MPa, water-intake rate be 8.4 ?14.5%.
Embodiment 4
The embodiment of the present embodiment is as different from Example 1: by the amount qualitative change of the atlapulgite taking in step 1, waste gypsum, garden waste, iron trichloride and Aluminium Sulphate usp (powder), be 400g, 100g, 50g, 30g, 20g, join in order respectively dry weight and be in the sewage sludge of water ratio 99.8% of 400g and mix, it is 70% that step 2 mixes the rear water ratio of dehydration, air-dry water ratio through 36h is down to 60%, and other steps and parameter are identical with embodiment 1.
Grain finished product outward appearance be the shaggy ball-type solid of beige, tap density be 630 ?690kg/m
3, surface density be 1107 ?1280kg/m
3, cylindrical compress strength is 4.0MPa, water-intake rate be 6.5 ?12.7%.
Claims (4)
1. a method of utilizing conditioning dehydrated sludge baking ceramsite, is characterized in that comprising the following steps:
(1) proportioning raw materials: the mass percent of sewage sludge, atlapulgite, waste gypsum, vegetalitas garden waste, iron trichloride and Tai-Ace S 150 that the weight of dewatered sludge of take is benchmark is (30%～50%): (20%～40%): (10%～20%): (2%～5%): (3%～7%): (1%～3%);
(2) blending process: by the water ratio of sewage sludge be adjusted to 99.6 ?99.8% be pumped in stirrer, according to the proportioning raw materials described in step (1), first add iron trichloride and Tai-Ace S 150, mix at least after 30min, drop into respectively again atlapulgite, waste gypsum and vegetalitas garden waste powder, stir and make compound;
(3) pressure filtration molding process: the blended stock described in step (2) is delivered in bowl centrifuge and dewatered, by mud cake airing 24～36h that after dehydration, water ratio is 65～70%, when its water ratio is 55～60%, deliver in tablets press, make the raw material ball of particle diameter 8～10mm;
(4) dry and roasting process: raw material ball step (3) Suo Shu is dried to 1～2h at 105 ℃, and dry object, in order to remove the part moisture in pellet, prevents roasting process mesomere; Then raw material ball is sent into preheating and sintering in retort furnace, preheating is for further adjusting the chemical constitution of raw material ball, mainly to reduce the content that burns carbon in swollen front pellet, to reach the best swollen result of burning, setting temperature rise rate is 10～15 ℃/min, and preheating 20～30min at 250～350 ℃, rises to 600 ℃ with identical temperature rise rate afterwards, at 600 ℃, keep 15～20min, adjust temperature rise rate and be rapidly heated to 900～1000 ℃ of constant temperature calcining 10～15min with 30～50 ℃/min;
(5) discharging process of cooling: will take out and be cooled to room temperature after burned haydite furnace cooling to 550 ℃;
(6) screening: by step (5) gained haydite sieve, obtain the product of different-grain diameter.
2. according to the method for claim 1, it is characterized in that, described garden waste refers to shrub lop or the interior discarded showy flowers of herbaceous plants of intermediate cutting thing, turf-mown thing, fallen leaves, branch, garden and flower bed and the weeds that produce in green plants nature or maintenance processes, pulverizes 100 mesh sieves after being dried.
3. according to the method for claim 1, it is characterized in that, waste gypsum is to be phosphogypsum with the waste residue that phosphate ores and sulfuric acid manufacture phosphoric acid produce, main component is calcium sulfate, content is more than 80%, and other compositions comprise the oxide compound of silicon, aluminium, iron, magnesium, sodium, potassium, phosphorus, sulphur, titanium, manganese, cerium, carbon, fluorine element.
4. according to the method for claim 1, it is characterized in that, Tai-Ace S 150 is industrial aluminum sulphate, grinds rear mistake 100 mesh sieves.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103922560A (en) * | 2014-04-12 | 2014-07-16 | 北京工业大学 | Texturizer applied to oil-containing sludge in oil refinery |
| CN104058564A (en) * | 2014-07-02 | 2014-09-24 | 天津壹鸣环境工程有限公司 | Treatment system for preparing soilless culture medium by sintering sludge |
| CN104843962A (en) * | 2015-05-18 | 2015-08-19 | 东江环保股份有限公司 | Method for preparing marsh gas and producing sintered bricks by using municipal sludge |
| CN106116495A (en) * | 2016-06-28 | 2016-11-16 | 平凉华晨非金属应用科技有限公司 | Calcite lightweight through hole haydite |
| CN106242626A (en) * | 2016-07-28 | 2016-12-21 | 天津海泰市政绿化有限公司 | A kind of environment-friendly type plant pit covering |
| CN106242639A (en) * | 2016-08-16 | 2016-12-21 | 中电建水环境治理技术有限公司 | Bed mud carbonization haydite and preparation technology thereof are gushed in lake, river |
| CN106242512A (en) * | 2016-07-28 | 2016-12-21 | 天津海泰市政绿化有限公司 | A kind of garden waste environmental protection brick |
| CN107686333A (en) * | 2017-09-25 | 2018-02-13 | 贵州开磷磷石膏综合利用有限公司 | A kind of ardealite haydite as filler and preparation method thereof |
| CN107935485A (en) * | 2017-11-03 | 2018-04-20 | 常州市雄泰纺织品有限公司 | A kind of preparation method of building site noise reduction protective wall |
| CN110436937A (en) * | 2019-08-19 | 2019-11-12 | 南京师范大学 | It is a kind of containing algal gel, sludge and artificial lightweight aggregate of the high organic matter of mud and preparation method thereof |
| CN112341238A (en) * | 2020-11-24 | 2021-02-09 | 中国环境科学研究院 | Ceramsite and preparation method thereof |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103922560A (en) * | 2014-04-12 | 2014-07-16 | 北京工业大学 | Texturizer applied to oil-containing sludge in oil refinery |
| CN103922560B (en) * | 2014-04-12 | 2016-01-20 | 北京工业大学 | A kind of adjusting material being applied to refinery oily sludge |
| CN104058564A (en) * | 2014-07-02 | 2014-09-24 | 天津壹鸣环境工程有限公司 | Treatment system for preparing soilless culture medium by sintering sludge |
| CN104058564B (en) * | 2014-07-02 | 2016-06-22 | 天津壹鸣环境科技股份有限公司 | A kind of sewage sludge sintering soilless culture substrate processing method |
| CN104843962A (en) * | 2015-05-18 | 2015-08-19 | 东江环保股份有限公司 | Method for preparing marsh gas and producing sintered bricks by using municipal sludge |
| CN106116495A (en) * | 2016-06-28 | 2016-11-16 | 平凉华晨非金属应用科技有限公司 | Calcite lightweight through hole haydite |
| CN106242512A (en) * | 2016-07-28 | 2016-12-21 | 天津海泰市政绿化有限公司 | A kind of garden waste environmental protection brick |
| CN106242626A (en) * | 2016-07-28 | 2016-12-21 | 天津海泰市政绿化有限公司 | A kind of environment-friendly type plant pit covering |
| CN106242626B (en) * | 2016-07-28 | 2019-01-11 | 天津海泰市政绿化有限公司 | A kind of environment-friendly type plant pit covering |
| CN106242512B (en) * | 2016-07-28 | 2019-05-17 | 天津海泰市政绿化有限公司 | A kind of garden waste environmental protection brick |
| CN106242639A (en) * | 2016-08-16 | 2016-12-21 | 中电建水环境治理技术有限公司 | Bed mud carbonization haydite and preparation technology thereof are gushed in lake, river |
| CN106242639B (en) * | 2016-08-16 | 2018-04-10 | 中电建水环境治理技术有限公司 | Gush bed mud carbonization haydite and its preparation technology in river lake |
| CN107686333A (en) * | 2017-09-25 | 2018-02-13 | 贵州开磷磷石膏综合利用有限公司 | A kind of ardealite haydite as filler and preparation method thereof |
| CN107686333B (en) * | 2017-09-25 | 2020-02-04 | 贵州开磷磷石膏综合利用有限公司 | Phosphogypsum ceramsite used as filler and preparation method thereof |
| CN107935485A (en) * | 2017-11-03 | 2018-04-20 | 常州市雄泰纺织品有限公司 | A kind of preparation method of building site noise reduction protective wall |
| CN110436937A (en) * | 2019-08-19 | 2019-11-12 | 南京师范大学 | It is a kind of containing algal gel, sludge and artificial lightweight aggregate of the high organic matter of mud and preparation method thereof |
| CN110436937B (en) * | 2019-08-19 | 2021-11-09 | 南京师范大学 | Artificial light aggregate containing algae mud, sludge and high organic matters in sludge and preparation method thereof |
| CN112341238A (en) * | 2020-11-24 | 2021-02-09 | 中国环境科学研究院 | Ceramsite and preparation method thereof |
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Granted publication date: 20141231 Termination date: 20191209 |