CN107473684A - 一种河涌底泥环保处理药剂 - Google Patents
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- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000000292 calcium oxide Substances 0.000 claims abstract description 17
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 17
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 16
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
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Abstract
本发明公开了一种河涌底泥环保处理药剂,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土10%‑20%;水泥8%‑12%;石膏2%‑4%;粉煤灰55%‑65%;生石灰1%‑3%,稳定剂8%‑12%。本发明的河涌底泥环保处理药剂可对河涌底泥进行固化稳定化,处理后的底泥土抗剪强度、抗压强度、压缩特性等力学性能显著提高,底泥中的重金属渗出性显著降低,固化底泥可以作为建筑填土、河涌护堤材料和路基材料,实现废物的资源化利用。
Description
技术领域
本发明涉及河涌底泥环保处理药剂。
背景技术
目前,底泥处理方法主要有固化/稳定化、掩蔽、电动修复、生物修复等技术。其中,以水泥为主要固化剂的固化/稳定化技术相对处理周期短、效率高、成本低,因此成为国内外底泥处理的优先实用技术。固化后的底泥土抗剪强度、抗压强度、压缩特性等力学性能显著提高,底泥中的重金属渗出性显著降低,固化底泥可以作为建筑填土、河涌护堤材料和路基材料,可以实现废物的资源化利用。
发明内容
本发明的提出了一种河涌底泥环保处理药剂,对于重金属含量较高的底泥,单独利用水泥固化/稳定化,水泥投量高,处理成本高,所以通过外加稳定剂(包括络合药剂、吸附剂)等手段,把易渗出的重金属转化为强络合态或强吸附态,进一步提高底泥中的重金属稳定性、降低水泥用量。
本发明的技术方案是这样实现的:一种河涌底泥环保处理药剂,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土10%-20%;水泥8%-12%;石膏2%-4%;粉煤灰55%-65%;生石灰1%-3%,稳定剂8%-12%。
进一步,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土10%-16%;水泥8%-10%;石膏2%-3%;粉煤灰55%-60%;生石灰1%-2%,稳定剂8%-10%。
进一步,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土12%-18%;水泥9%-10%;石膏3%-4%;粉煤灰60%-65%;生石灰2%-3%,稳定剂9%-10%。
进一步,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土15%,水泥10%,石膏3%,粉煤灰60%,生石灰2%,稳定剂10%。
进一步,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土10%;水泥8%;石膏2%;粉煤灰65%;生石灰3%,稳定剂12%。
进一步,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土20%;水泥12%;石膏4%;粉煤灰55%;生石灰1%,稳定剂8%。
进一步,所述稳定剂为硫化物、磷酸盐以及有机耦合剂。
进一步,所述硫化物类为硫酸钠。
本发明的有益效果为:本发明的河涌底泥环保处理药剂可对河涌底泥进行固化稳定化,处理后的底泥土抗剪强度、抗压强度、压缩特性等力学性能显著提高,底泥中的重金属渗出性显著降低,固化底泥可以作为建筑填土、河涌护堤材料和路基材料,实现废物的资源化利用。
具体实施方式
为更好地理解本发明,下面通过以下实施例对本发明作进一步具体的阐述,但不可理解为对本发明的限定,对于本领域的技术人员根据上述发明内容所作的一些非本质的改进与调整,也视为落在本发明的保护范围内。
实施例1
根据本发明提供的内容,发明人制得河涌底泥环保处理药剂1,其中各组分的配比如下:
所述河涌底泥环保处理药剂1包括以下重量百分比的各组份:膨润土15%,水泥10%,石膏3%,粉煤灰60%,生石灰2%,硫化物3%,磷酸盐3%,有机耦合剂4%。
实施例2
根据本发明提供的内容,发明人制得河涌底泥环保处理药剂2,其中各组分的配比如下:
所述河涌底泥环保处理药剂2包括以下重量百分比的各组份:膨润土10%;水泥8%;石膏2%;粉煤灰65%;生石灰3%,硫酸钠4%,磷酸盐4%,有机耦合剂4%。
实施例3
根据本发明提供的内容,发明人制得河涌底泥环保处理药剂3,其中各组分的配比如下:
所述河涌底泥环保处理药剂3包括以下重量百分比的各组份:膨润土20%;水泥12%;石膏4%;粉煤灰55%;生石灰1%,硫酸钠3%,磷酸盐3%,有机耦合剂2%。
本发明的河涌底泥环保处理药剂1、河涌底泥环保处理药剂2、河涌底泥环保处理药剂3可对河涌底泥进行固化稳定化,处理后的底泥土抗剪强度、抗压强度、压缩特性等力学性能显著提高,底泥中的重金属渗出性显著降低,固化底泥可以作为建筑填土、河涌护堤材料和路基材料,实现废物的资源化利用。
针对底泥中重金属存在形态和溶出特性,在常规固化技术基础上,本发明从固化剂和稳定剂两方面进一步筛选和改性,推出了高效的河涌底泥环保处理药剂。其中,膨润土、水泥、石膏、生石灰以及粉煤灰为固化剂;硫化物、磷酸盐以及有机耦合剂为稳定剂。
首先我们对商品水泥进行改良。底泥是大小不同的矿物颗粒集合体,重金属物理吸附或化学吸附在矿物颗粒表面,颗粒间隙充满水和空气,颗粒表面通常带负电荷。通过在商品水泥中添加改良剂(硫化物、磷酸盐以及有机耦合剂),压缩离子表面电荷层厚度、中和表面负电量,使得颗粒间更容易聚合形成大的颗粒,提高聚集颗粒的密实度和底泥固化强度,降低固化底泥的孔隙率,降低透水系数,从而减少重金属渗出。
其次,根据底泥中的重金属在不同环境中具有不同的存在状态,添加相应的稳定剂,使淤泥中不稳定态的重金属转化为稳定态的重金属,增强重金属在固化颗粒表面的附着力,从而减小重金属的渗出活性。同时,添加的稳定剂和底泥、水泥发生化学反应产生一些具有对重金属物理有包裹作用的物质,从而一步降低重金属的释放。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (8)
1.一种河涌底泥环保处理药剂,其特征在于,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土10%-20%;水泥8%-12%;石膏2%-4%;粉煤灰55%-65%;生石灰1%-3%,稳定剂8%-12%。
2.如权利要求1所述的河涌底泥环保处理药剂,其特征在于,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土10%-16%;水泥8%-10%;石膏2%-3%;粉煤灰55%-60%;生石灰1%-2%,稳定剂8%-10%。
3.如权利要求1所述的河涌底泥环保处理药剂,其特征在于,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土12%-18%;水泥9%-10%;石膏3%-4%;粉煤灰60%-65%;生石灰2%-3%,稳定剂9%-10%。
4.如权利要求1所述的河涌底泥环保处理药剂,其特征在于,所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土15%,水泥10%,石膏3%,粉煤灰60%,生石灰2%,稳定剂10%。
5.如权利要求1所述的河涌底泥环保处理药剂,其特征在于:所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土10%;水泥8%;石膏2%;粉煤灰65%;生石灰3%,稳定剂12%。
6.如权利要求1所述的河涌底泥环保处理药剂,其特征在于:所述河涌底泥环保处理药剂包括以下重量百分比的各组份:膨润土20%;水泥12%;石膏4%;粉煤灰55%;生石灰1%,稳定剂8%。
7.如权利要求1-6任一所述的河涌底泥环保处理药剂,其特征在于:所述稳定剂为硫化物、磷酸盐以及有机耦合剂。
8.如权利要求7所述的河涌底泥环保处理药剂,其特征在于:所述硫化物为硫酸钠。
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110526647A (zh) * | 2019-09-11 | 2019-12-03 | 上海海顾新材料科技有限公司 | 一种底泥干化固结剂及其制备方法 |
CN112321104A (zh) * | 2020-11-27 | 2021-02-05 | 北京嘉盛天合气体科技有限公司 | 一种河湖底泥固化修复剂及其制备方法 |
CN112794591A (zh) * | 2021-03-23 | 2021-05-14 | 深圳瑞新达新能源科技有限公司 | 一种复合淤泥固化剂 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2002360428A1 (en) * | 2001-11-26 | 2003-06-10 | Setliff Brothers Ii, Ltd. | Quick set flowable fill composition and method |
CN101172749A (zh) * | 2007-10-12 | 2008-05-07 | 河海大学 | 污水厂产生的脱水污泥进行固化/稳定化处理用固化剂 |
CN101265070A (zh) * | 2008-04-17 | 2008-09-17 | 高康 | 一种污泥固化剂以及应用 |
CN102503274A (zh) * | 2011-11-03 | 2012-06-20 | 湖南大学 | 重金属污染底泥固化剂 |
CN103086670A (zh) * | 2013-01-31 | 2013-05-08 | 湖北理工学院 | 一种含重金属湖泊疏浚底泥固化的方法 |
-
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- 2017-09-11 CN CN201710813735.XA patent/CN107473684B/zh not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2002360428A1 (en) * | 2001-11-26 | 2003-06-10 | Setliff Brothers Ii, Ltd. | Quick set flowable fill composition and method |
CN101172749A (zh) * | 2007-10-12 | 2008-05-07 | 河海大学 | 污水厂产生的脱水污泥进行固化/稳定化处理用固化剂 |
CN101265070A (zh) * | 2008-04-17 | 2008-09-17 | 高康 | 一种污泥固化剂以及应用 |
CN102503274A (zh) * | 2011-11-03 | 2012-06-20 | 湖南大学 | 重金属污染底泥固化剂 |
CN103086670A (zh) * | 2013-01-31 | 2013-05-08 | 湖北理工学院 | 一种含重金属湖泊疏浚底泥固化的方法 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110526647A (zh) * | 2019-09-11 | 2019-12-03 | 上海海顾新材料科技有限公司 | 一种底泥干化固结剂及其制备方法 |
CN110526647B (zh) * | 2019-09-11 | 2022-02-18 | 上海海顾新材料科技有限公司 | 一种底泥干化固结剂及其制备方法 |
CN112321104A (zh) * | 2020-11-27 | 2021-02-05 | 北京嘉盛天合气体科技有限公司 | 一种河湖底泥固化修复剂及其制备方法 |
CN112794591A (zh) * | 2021-03-23 | 2021-05-14 | 深圳瑞新达新能源科技有限公司 | 一种复合淤泥固化剂 |
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