CN100577590C - Impermeable material based on flue gas desulfurization byproduct and usage in garbage landfill thereof - Google Patents
Impermeable material based on flue gas desulfurization byproduct and usage in garbage landfill thereof Download PDFInfo
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- CN100577590C CN100577590C CN200710052880A CN200710052880A CN100577590C CN 100577590 C CN100577590 C CN 100577590C CN 200710052880 A CN200710052880 A CN 200710052880A CN 200710052880 A CN200710052880 A CN 200710052880A CN 100577590 C CN100577590 C CN 100577590C
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses an impermeable material based on flue gas desulphurization by-product and the usage in trash burying. The impermeable material is compounded evenly according the weight by 60-90 percent of circulating fluidized bed flue gas desulphurization dreg and 10-40 percent of chemical additive under the dried powder ugh condition. The chemical additive is the one kind or two kinds of combination of bentonite and kleit at random proportion, and the impermeable material can be applied to be used as an anti-seepage layer in trash burying, wherein, the anti-seepage layer used as the underlay of the trash burying field has a thickness of 80cm to 120cm; the anti-seepage layer used as the intermediate coating has a thickness of 15cm to 30cm; and the anti-seepage layer used as the full closure field has a thickness of 60cm to 100cm. The impermeable material can not only prevent from polluting the underground water of the trash burying field, reduce the treatment of trash infiltrated liquid and ensure that the trash buried gases are collected orderly, but also make full use of the huge desulphurization dreg and change waste into resources, thereby realizing the win-win benefit.
Description
Technical field
The present invention relates to the recycling of circulating fluid bed flue-gas desulfurizing by product, refer to a kind of particularly based on the impervious material of circulating fluid bed flue-gas desulfurizing by product and the purposes in refuse landfill thereof.
Technical background
The circulating fluid bed flue-gas desulfurizing technology have adapt to that coal is wide, investment and advantage such as running cost is cheap, floor space is little, water loss is little, it is applied more and more widely.How recycling is a great problem of circulating fluid bed flue-gas desulfurizing technology to but desulfurizing byproduct---desulfurization slag always.
At present, domestic to the processing of circulating fluid bed flue-gas desulfurizing by product or to abandon stacking, this not only will occupy a large amount of land resources, has also wasted resources such as the calcium Ca in the desulfurizing byproduct, sulphur S, also might cause secondary pollution to surrounding environment.For this reason, the scientific research personnel studies the feasibility that the circulating fluid bed flue-gas desulfurizing by product is applied to material of construction, as being in the Chinese invention patent ublic specification of application of CN1640843A and CN1911848A at publication number, introduced respectively desulfurization slag has been made cement or concrete method as one of raw material, but owing to a large amount of calcium sulfite CaSO in the desulfurization slag
3In long-term and process that air contacts, understand and be oxidized to calcium sulfate CaSO gradually
4Thereby, significantly reduce cement or concrete stability.And, some calcium based compound in the desulfurization slag can cause cement products or concrete construction to produce and expand because the hydration reaction volume increases in being incorporated into cement or concrete material the time, thereby reduced cement or concrete security, brought hidden danger to construction work.In addition, contain the muriate of higher concentration in the circulating fluid bed flue-gas desulfurizing by product, muriate has very big corrosive nature to metal, so desulfurization slag should not be used to contain the occasion of reinforcing bar when being used for material of construction.Owing to above many-sided reason, desulfurization slag has been subjected to more restriction as the application of material of construction, the desulfurization slag blended amount of adding in the practical application in cement or the concrete material generally is controlled in 10%, and so low blended amount can't resolve a large amount of problems of stacking of desulfurization slag at all.
The scientific research personnel has also carried out the experimental study that utilizes the circulating fluid bed flue-gas desulfurizing by product to improve the soil, at publication number is in the Chinese invention patent ublic specification of application of CN1654595A, a kind of method of utilizing coal desulfurization by product improvement alkaline soil has been proposed, but this method can only be applied to the soil of special properties, and also may produce hardening function to soil, desulfurization slag is to the influence of surrounding environment and the crop further further investigation that also awaits.In relevant bibliographical information, the circulating fluid bed flue-gas desulfurizing slag also is used to sintered brick and tile, but when temperature reaches more than 600 ℃, a large amount of calcium sulfite CaSO in the desulfurization slag
3Just begin to decompose, discharge the sulfurous gas SO that from coal-fired plant flue gas, absorbs
2, this makes the coal-fired plant flue gas desulfurization lose meaning to a great extent.
On the other hand, along with the development of society and people raising, need the domestic refuse amount disposed increasing to environmental requirement.At present, the main mode of China's refuse treatment remains garbage loading embeading and handles, and one of gordian technique of building garbage sanitary filling field is the antiseepage processing, comprises the antiseepage of landfill yard substrate, the anti-antiseepage that blends the closing of full storehouse of intermediate cover layer.The antiseepage of landfill yard substrate mainly is to prevent from that garbage leachate from leaking into to cause phreatic pollution in the underground water, the tectal antiseepage of closing of intermediate cover layer and full storehouse mainly is the treatment capacity that prevents that rainwater from penetrating into increases garbage leachate in the rubbish, strengthen the overall tightness of refuse landfill simultaneously, reduce foul smell and escape, the gas that garbage loading embeading is produced is able to ordered collection and utilization.The seepage control measure of conventional garbage landfill yard mainly contains two kinds: a kind of is to lay density polyethylene film with high (HDPE) impervious barrier, and another kind is to lay natural clay or modified clay class impervious barrier.The density polyethylene film with high cost is higher, and every square metre price is about 40 yuan, and this has caused very big economical load for the huge refuse landfill of area.As adopting natural clay as impervious barrier, the clay amount of big-and-middle-sized refuse landfill needs is too big, is difficult to obtain the natural clay of capacity.In actual landfill process, the gravelly soil of being stored when some landfill yard adopts clear storehouse carries out the centre and covers, but the permeability coefficient of gravelly soil is approximately 1.0 * 10
-4Cm/s is far longer than and stipulates in " domestic refuse Sanitary Landfill Technology standard " that " permeability coefficient of natural clay class and modified clay class impervious barrier should be greater than 1.0 * 10
-7Cm/s " maximum permissible value, cause a large amount of rainwater infiltrations to enter in the garbage leachate, the garbage percolation liquid measure that causes needs to be handled significantly increases.
Hence one can see that, in the construction of the processing of circulating fluid bed flue-gas desulfurizing by product and garbage sanitary filling field impervious barrier, is that the circulating fluid bed flue-gas desulfurizing by product does not still have effective resource utilization method on the one hand, causes a large amount of desulfurization slag to abandon stacking; Be that garbage sanitary filling field can not be obtained the cheap impervious material of capacity on the other hand.Up to now, the circulating fluid bed flue-gas desulfurizing by-product resource processing scheme that still above-mentioned two aspect factors is not combined consideration.
Summary of the invention
Purpose of the present invention just provides a kind of based on the impervious material of flue gas desulfurization byproduct and the purposes in refuse landfill thereof.The impervious material of garbage sanitary filling field will be used as after the flue gas desulfurization byproduct modification, not only can prevent refuse landfill to phreatic pollution, reduce garbage leachate treatment capacity, make garbage loading embeading gas obtain ordered collection, and can make a large amount of desulfurization slag obtain comprehensive utilization of resources, turn waste into wealth, realize the effect of both doulbe-sides' victorys.
For achieving the above object, the impervious material that the present invention developed based on flue gas desulfurization byproduct, formed by 60～90% circulating fluid bed flue-gas desulfurizing slag and additive uniform mixing assembly under dry powder of 10～40% by weight, described additive is the combination of one or both arbitrary proportions in wilkinite, the kaolin.
Take all factors into consideration technology and economic factors, the preferred weight proportion of above-mentioned impervious material is: the circulating fluid bed flue-gas desulfurizing slag accounts for 70～80%, and additive accounts for 20～30%.
Take all factors into consideration technology and economic factors, the weight proportion of above-mentioned impervious material the best is: the circulating fluid bed flue-gas desulfurizing slag accounts for 75～80%, and additive accounts for 20～25%.
Further, the grain diameter in the above-mentioned circulating fluid bed flue-gas desulfurizing slag more than 60% is less than 10 μ m, and the grain diameter in the above-mentioned additive more than 90% is less than or equal to 1mm.
Further, Ca (OH) in the above-mentioned circulating fluid bed flue-gas desulfurizing slag
2Weight percentage be 5～15%, CaSO
3Weight percentage be 20～45%, CaSO
4Weight percentage be 3～15%, all the other are impurity.
Above-mentioned impervious material based on flue gas desulfurization byproduct can be used as impervious barrier in garbage sanitary filling.Its concrete application method is as follows: earlier that above-mentioned impervious material is even with the water thorough mixing that accounts for its weight 10～30%, form slurry, the position that needs in refuse landfill then is laid to impervious barrier with slurry, impervious barrier compacting and floating surface is got final product again.Wherein: the impervious barrier laying depth as the refuse landfill substrate is 80～120cm, and the impervious barrier thickness that is used as intermediate cover layer is 15～30cm, and the impervious barrier thickness that closes as full storehouse is 60～100cm.
The present invention is such with the modification of circulating fluid bed flue-gas desulfurizing by product as the antiseepage principle of rubbish landfill yard anti-seepage material: say that from physical angle the circulating fluid bed flue-gas desulfurizing slag is a kind of dry state mixture, main component is CaSO
4, CaSO
3, the Ca of complete reaction (OH) not
2And impurity etc., the desulfurization slag particle grain size is little, the meta particle diameter is about 10 μ m, the true density of desulfurization slag is generally 2.5～3.2kg/l, and after desulfurization slag and water-absorbent is strong, viscosity is good additive assembly were mixed and stirred with water again, water can enter in the slight void of desulfurization slag and additive, form fine and close mixing material, and this mixing material has good viscosity and water-absorbent, thereby has good barrier characteristics, and its permeability coefficient is less than 1.0 * 10
-7Cm/s, rainwater and ooze drop liquid and be difficult to infiltration and pass through.Say from chemical terms, contain the not complete reaction Ca (OH) of 5～15% weight percents in the desulfurization slag approximately
2And be alkaline, Ca (OH)
2Can with CO
2Reaction generates stable CaCO
3And the generation hardening function makes the anti-permeability of impervious material better; Alkaline matter in the desulfurization slag can generate the indissoluble precipitation with the heavy metal reaction in the garbage leachate, makes heavy metal be difficult for precipitateing in the underground water; The alkalescence of desulfurization slag can also make CaSO
3Be difficult to take place Decomposition and discharge SO
2, and can promote CaSO
3Change into stable CaSO
4The above characteristics of desulfurization slag have further improved the anti-permeability of impervious material, and have improved the stability of impervious material.
The present invention has the advantage of following several respects:
1) the present invention carries out recycling with the circulating fluid bed flue-gas desulfurizing by product; overcome desulfurization slag and stacked the problem of taking up an area of, reduced secondary pollution, both utilized the desulfurization slag resource; protect environment again, improved the global advantage and the competitive power of circulating fluid bed flue-gas desulfurizing technology.
2) the main raw desulfurization slag particle diameter that adopts of the present invention is little, and density is big, and after additive material the mixings water mixing good anti-seepage effect is arranged, and through testing repeatedly, confirms that its permeability coefficient is less than 1.0 * 10
- 7Cm/s.And contain the not slaked lime Ca (OH) of complete reaction in the desulfurization slag
2, make impervious material be alkalescence, both can effectively stop the heavy metal in the rubbish to be separated out, can impel impervious barrier partly to harden again, and then improve barrier performance.
3) the present invention is used for the antiseepage processing of refuse landfill, both prevented that garbage leachate and heavy metal from entering underground water and polluting, stoped rainwater to enter the treatment capacity of oozing drop liquid and increasing garbage leachate again, also strengthened the overall tightness of refuse landfill, the gas that garbage loading embeading is produced obtains ordered collection.
4) starting material wide material sources of the present invention, production technique is simple, processing cost is low, compares expensive density polyethylene film with high impervious barrier, the present invention can reduce by 20～40% garbage loading embeading antiseepage processing cost.
Embodiment
Below in conjunction with specific embodiment the impervious material that the present invention is based on flue gas desulfurization byproduct and the purposes in garbage loading embeading thereof are described in further detail:
Embodiment 1:
A kind of impervious material based on flue gas desulfurization byproduct, this impervious material are formed by 80% circulating fluid bed flue-gas desulfurizing slag and additive uniform mixing assembly under dry powder of 20% by weight ratio.Wherein: above-mentioned circulating fluid bed flue-gas desulfurizing slag is taken from the by product of certain coal-burning power plant's circulating fluid bed flue-gas desulfurizing engineering, after testing Ca (OH) in this circulating fluid bed flue-gas desulfurizing slag
2Weight percentage be about 11%, CaSO
3Weight percentage be about 25%, CaSO
4Weight percentage be about 14%, all the other are impurity.Simultaneously, nearly 80% grain diameter is less than 10 μ m in this circulating fluid bed flue-gas desulfurizing slag, and the meta particle diameter is about 9.2 μ m.Above-mentioned additive is selected wilkinite for use, and the grain diameter in this wilkinite more than 90% is less than or equal to 1mm.
When above-mentioned impervious material based on flue gas desulfurization byproduct is used for the seepage control project of garbage sanitary filling field, earlier that above-mentioned impervious material is even with the water thorough mixing in stirrer that accounts for its weight 20%, form slurry, the position that needs in refuse landfill then evenly is laid to impervious barrier with slurry, with the impervious barrier compacting, again with its floating getting final product in surface.Wherein: the impervious barrier laying depth as the refuse landfill substrate is 100cm, and the impervious barrier thickness that is used as intermediate cover layer is 20cm, and the impervious barrier thickness that closes as full storehouse is 80cm.Simultaneously, planned matching operations such as impervious barrier and water guide layer, air guide layer, and the guide that certain gradient is suitable for liquids and gases has been set.Through actual detected, the permeability coefficient of obtained impervious barrier is less than 1 * 10
-7Cm/s satisfies the requirement of national standard to rubbish landfill yard anti-seepage material fully.
Embodiment 2:
A kind of impervious material based on flue gas desulfurization byproduct, this impervious material are formed by 70% circulating fluid bed flue-gas desulfurizing slag and additive uniform mixing assembly under dry powder of 30% by weight ratio.Wherein: above-mentioned circulating fluid bed flue-gas desulfurizing slag is taken from the by product of certain coal-burning power plant's circulating fluid bed flue-gas desulfurizing engineering, after testing Ca (OH) in this circulating fluid bed flue-gas desulfurizing slag
2Weight percentage be about 6%, CaSO
3Weight percentage be about 40%, CaSO
4Weight percentage be 5%, all the other are impurity.Simultaneously, nearly 75% grain diameter is less than 10 μ m in this circulating fluid bed flue-gas desulfurizing slag, and the meta particle diameter is about 9.5 μ m.Above-mentioned additive is selected kaolin for use, and the grain diameter in this kaolin more than 90% is less than or equal to 1mm.
When above-mentioned impervious material based on flue gas desulfurization byproduct is used for the seepage control project of garbage sanitary filling field, earlier that above-mentioned impervious material is even with the water thorough mixing in stirrer that accounts for its weight 15%, form slurry, the position that needs in refuse landfill then evenly is laid to impervious barrier with slurry, with the impervious barrier compacting, again with its floating getting final product in surface.Wherein: the impervious barrier laying depth as the refuse landfill substrate is 110cm, and the impervious barrier thickness that is used as intermediate cover layer is 15cm, and the impervious barrier thickness that closes as full storehouse is 90cm.Simultaneously, planned matching operations such as impervious barrier and water guide layer, air guide layer, and the guide that certain gradient is suitable for liquids and gases has been set.Through actual detected, the permeability coefficient of obtained impervious barrier is less than 1 * 10
-7Cm/s satisfies the requirement of national standard to rubbish landfill yard anti-seepage material fully.
Embodiment 3:
A kind of impervious material based on flue gas desulfurization byproduct, this impervious material are formed by 85% circulating fluid bed flue-gas desulfurizing slag and additive uniform mixing assembly under dry powder of 15% by weight ratio.Wherein: above-mentioned circulating fluid bed flue-gas desulfurizing slag is taken from the by product of certain coal-burning power plant's circulating fluid bed flue-gas desulfurizing engineering, after testing Ca (OH) in this circulating fluid bed flue-gas desulfurizing slag
2Weight percentage be about 8%, CaSO
3Weight percentage be about 33%, CaSO
4Weight percentage be 10%, all the other are impurity.Simultaneously, nearly 70% grain diameter is less than 10 μ m in this circulating fluid bed flue-gas desulfurizing slag, and the meta particle diameter is about 9.8 μ m.Above-mentioned additive is selected wilkinite and kaolinic combination for use, and wilkinite and kaolinic ratio respectively account for half of weight, and the grain diameter in the additive more than 90% is less than or equal to 1mm.
When above-mentioned impervious material based on flue gas desulfurization byproduct is used for the seepage control project of garbage sanitary filling field, earlier that above-mentioned impervious material is even with the water thorough mixing in stirrer that accounts for its weight 15%, form slurry, the position that needs in refuse landfill then evenly is laid to impervious barrier with slurry, with the impervious barrier compacting, again with its floating getting final product in surface.Wherein: the impervious barrier laying depth as the refuse landfill substrate is 90cm, and the impervious barrier thickness that is used as intermediate cover layer is 25cm, and the impervious barrier thickness that closes as full storehouse is 70cm.Simultaneously, planned matching operations such as impervious barrier and water guide layer, air guide layer, and the guide that certain gradient is suitable for liquids and gases has been set.Through actual detected, the permeability coefficient of obtained impervious barrier is less than 1 * 10
-7Cm/s satisfies the requirement of national standard to rubbish landfill yard anti-seepage material fully.
By enforcement of the present invention, can realize the recycling of circulating fluid bed flue-gas desulfurizing by product, the impervious material permeability coefficient that is mixed with is less than 1 * 10
-7Cm/s can substitute the seepage control project that density polyethylene film with high is applied to garbage sanitary filling field, and the antiseepage processing cost is cheap.
Claims (6)
1. impervious material based on flue gas desulfurization byproduct is characterized in that: this impervious material is formed by 60～90% circulating fluid bed flue-gas desulfurizing slag and additive uniform mixing assembly under dry powder of 10～40% by weight; Ca (OH) in the described circulating fluid bed flue-gas desulfurizing slag
2Weight percentage be 5～15%, CaSO
3Weight percentage be 20～45%, CaSO
4Weight percentage be 3～15%, all the other are impurity; Described additive is the combination of one or both arbitrary proportions in wilkinite, the kaolin.
2. the impervious material based on flue gas desulfurization byproduct according to claim 1 is characterized in that: this impervious material is formed by 70～80% circulating fluid bed flue-gas desulfurizing slag and additive uniform mixing assembly under dry powder of 20～30% by weight ratio.
3. the impervious material based on flue gas desulfurization byproduct according to claim 1 is characterized in that: this impervious material is formed by 75～80% circulating fluid bed flue-gas desulfurizing slag and additive uniform mixing assembly under dry powder of 20～25% by weight ratio.
4. according to claim 1 or 2 or 3 described impervious materials based on flue gas desulfurization byproduct, it is characterized in that: the grain diameter in this circulating fluid bed flue-gas desulfurizing slag more than 60% is less than 10 μ m, and the grain diameter in this additive more than 90% is less than or equal to 1mm.
The described impervious material based on flue gas desulfurization byproduct of claim 1 in garbage loading embeading as the purposes of impervious barrier.
6. the impervious material based on flue gas desulfurization byproduct according to claim 5 in garbage loading embeading as the purposes of impervious barrier, it is characterized in that: this purposes is earlier that above-mentioned impervious material is even with the water thorough mixing that accounts for its weight 10～30%, form slurry, the position that needs in refuse landfill then is laid to impervious barrier with slurry, impervious barrier compacting and floating surface is got final product again; Wherein: the impervious barrier laying depth as the refuse landfill substrate is 80～120cm, and the impervious barrier thickness that is used as intermediate cover layer is 15～30cm, and the impervious barrier thickness that closes as full storehouse is 60～100cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710052880A CN100577590C (en) | 2007-08-02 | 2007-08-02 | Impermeable material based on flue gas desulfurization byproduct and usage in garbage landfill thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710052880A CN100577590C (en) | 2007-08-02 | 2007-08-02 | Impermeable material based on flue gas desulfurization byproduct and usage in garbage landfill thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101157528A CN101157528A (en) | 2008-04-09 |
| CN100577590C true CN100577590C (en) | 2010-01-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103922620B (en) * | 2013-01-14 | 2016-03-30 | 宝山钢铁股份有限公司 | A kind of take refuse as the sanitary filling field covering material of base-material |
| CN109653254B (en) * | 2017-08-06 | 2021-09-17 | 滕州道智盛智能科技有限公司 | Method for laying impermeable material of refuse landfill |
| CN113860830B (en) * | 2021-09-02 | 2022-08-02 | 浙江大学 | Flexible anti-cracking covering anti-seepage material taking steel slag as main material and construction process |
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2007
- 2007-08-02 CN CN200710052880A patent/CN100577590C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| 垃圾填埋场防渗衬里粘性土的改性研究. 史敬华，赵勇胜，洪梅.吉林大学学报（地球科学版），第33卷第3期. 2003 |
| 垃圾填埋场防渗衬里粘性土的改性研究. 史敬华，赵勇胜，洪梅.吉林大学学报（地球科学版），第33卷第3期. 2003 * |
| 循环流化床灰渣利用研究进展. 李登新，吕俊复，郭庆杰，岳光溪.热能动力工程，第18卷第总第103期. 2003 |
| 循环流化床灰渣利用研究进展. 李登新，吕俊复，郭庆杰，岳光溪.热能动力工程，第18卷第总第103期. 2003 * |
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