CN107721270B - 一种利用市政污泥制备非烧结透水砖的方法 - Google Patents
一种利用市政污泥制备非烧结透水砖的方法 Download PDFInfo
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- CN107721270B CN107721270B CN201711003435.1A CN201711003435A CN107721270B CN 107721270 B CN107721270 B CN 107721270B CN 201711003435 A CN201711003435 A CN 201711003435A CN 107721270 B CN107721270 B CN 107721270B
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- SMYKVLBUSSNXMV-UHFFFAOYSA-J aluminum;tetrahydroxide Chemical compound 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[P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N silicate Chemical compound 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[O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000002588 toxic Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
- 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
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Abstract
本发明公开了一种利用市政污泥、建筑废物、稀土尾渣及粉煤灰等固体废弃物制备非烧结透水砖的方法。包括以下步骤:A、取废水处理厂脱水污泥、建筑废弃物钢渣、稀土尾矿及粉煤灰作为透水砖原料备用;B、取粉煤灰与水泥按2:3比例混合后,作为无机胶黏材料,再以约1:3的比例与建筑废弃物骨料混合;C、配制NaOH溶液,作为无机胶黏材料的激发剂;D、污泥与稀土尾矿以5:1的比例混合均匀,迅速加入到B所得的混合物料,混合均匀;E、将D所获得的混合物料与C配制的NaOH溶液以5:1的质量比加入搅拌机中,以1000rpm转速搅拌1min,使其充分混合;F、将搅拌后的混合材料倒入模具,制得砖坯,经过28d的自然养护后,制得抗压等级可达MU30的透水砖。
Description
技术领域
本发明属于环境保护技术领域,涉及利用市政污泥、建筑废物、稀土尾渣及粉煤灰等固体废物制备非烧结透水砖的方法。
背景技术
市政污泥是污水处理厂在污水处理过程中产生的沉淀物质,主要源于初沉池、二沉池等处理环节。随着社会经济的快速发展及城市化进程的不断加快,工业及生活污水的处理量日益增多,导致污泥的产量急剧增加。截至2014年底,全国城市、县累计建成污水处理厂3362座,污水处理能力近1.6亿m3/d,较2013年新增约826万m3/d。北京、广东、江苏的城市污水厂干污泥产生量相对较多。以含水率80%计,全国年污泥总产量将突破4000万t,预计到2020年污泥产量将突破6000万t。
污泥是城市污水处理过程中产生的副产物,产量大、含水率高,含有丰富的氮、磷等营养元素和多种微量元素和土壤改良剂(有机腐殖质),但同时也含有部分有毒有害的有机污染物,有恶臭且易腐败,这些不利因素严重制约着污泥的资源化利用。如若不及时对其进行合理地处置,将会给环境和人类健康带来极大的危害。
根据GB/T 23484-2009《城镇污水处理厂污泥处置分类》,污泥处理指对污泥进行稳定化、减量化和无害化处理的过程,一般包括浓缩(调理)、脱水、厌氧消化、好氧消化、石灰稳定、堆肥、干化和焚烧等。污泥处置指污泥处理后的消纳过程,一般包括土地利用、填埋、建筑材料利用和焚烧。目前,利用市政污泥生产建筑耗材的方法多为烧结成型,针对非烧结多孔砖的研究较少。
另外,近年来,中国各大城市在连续出现的强降雨之后,都出现了不同程度的内涝现象,主要是由于现有的城市道路路面大多采用水泥柏油等不透水材料,下雨时会形成大面积积水,从而引发内涝。故而“海绵城市”一词逐渐进入大众视野,它用来形容城市能够像海绵一样,对于极端环境及自然灾害等具有良好的“弹性”,尤其在汛期,海绵城市能够及时地吸水、渗水、蓄水同时净水,并在需要时将储存的水逐步“释放”。在“海绵城市”的建设过程中,透水性优良的路面材料成为关键。其中,透水砖在满足道路硬化、平整的同时,还具有良好的透水性而被广泛应用于人行道、停车场等对路面强度要求不高的场地。
发明内容
本发明的目的是提供一种利用市政污泥和各种固体废弃物制备非烧结透水砖的方法,该方法具有投资运行成本较低、工艺流程简单易行等优点。
为了实现上述发明目的,本发明所采用的技术方案如下:
一种利用市政污泥制备非烧结透水砖的方法,包括如下步骤:
(1)取废水处理厂脱水污泥、建筑废弃物或钢渣及粉煤灰作为透水砖原料备用;其中,建筑废物进行初步破碎预处理得到透水砖制备骨料;
(2)取粉煤灰与水泥按2:3质量比混合后制成无机胶黏材料,再将制备的无机胶黏材料以1:3的比例与步骤(1)制备的透水砖制备骨料混合得到第一混合物料;
(3)配制6.25*10-2mol/L的NaOH溶液,作为无机胶黏材料的激发剂备用;
(4)将步骤(1)的废水处理厂脱水污泥与稀土尾矿以5:1质量比混合均匀,按3.6%质量比迅速加入到步骤(2)所得的第一混合物料,混合均匀得到第二混合物料;
(5)将步骤(4)所获得的第二混合物料与步骤(3)配制的NaOH溶液以5:1的质量比加入搅拌机中,以1000rpm转速搅拌1min,使其充分混合得到第三混合物料;
(6)将步骤(5)制备的第三混合材料倒入模具,制得砖坯,经过28d的自然养护后,制得透水砖。
在本发明的一个优选实施例中,步骤(1)中,所述建筑废物进行初步破碎预处理得到透水砖制备骨料的步骤如下:
(1.1)将所取建筑废物使用颚式破碎机破碎后,进一步使用圆盘破碎机进行破碎,得到再生粗骨料;
(1.2)将步骤(1.1)得到的再生粗骨料过10目筛,即2mm粒径的筛上物作为透水砖制备骨料。
在本发明的一个优选实施例中,步骤(1)中,所述废水处理厂脱水污泥为采用A2/O工艺处理的脱水污泥,其含水率81.90%,pH 6.1,有机质含量63.70%。
在本发明的一个优选实施例中,步骤(4)中,稀土尾矿中的Si、O、Al元素含量分别为47.12wt%、35.27wt%以及7.20wt%。
在本发明的一个优选实施例中,步骤(6)中,所述透水砖中包含废水处理厂脱水污泥5-10wt%,稀土尾矿1-2wt%,建筑废弃物或钢渣60-70wt%,粉煤灰8-12wt%,水泥15-18wt%。
在本发明的一个优选实施例中,步骤(6)中,所述透水砖抗压等级可达MU30,即抗压强度最小可达24MPa,平均值可达30MPa,透水系数达3.7×10-2cm/s,达到透水砖透水系数需大于1×10-2cm/s的设计要求。
本发明的无机胶黏材料采用粉煤灰-水泥混合体系(2:3)替代水泥,废物重复利用,降低制造成本。
本发明透水砖的制备采用破碎后的建筑废弃物代替砂石,实现以废治废目的。
本发明粉煤灰-水泥混合体系水化过程中加入6.25*10-2mol/L NaOH溶液对混合体系中的粉煤灰进行碱性激发,使其内的硅酸盐(铝酸盐)与Ca(OH)2反应生成C-S(A)-H键,产生胶凝作用。
本发明原料利用废水处理厂脱水污泥高有机质含量及低pH的特点,与稀土尾渣混合后,提高其潜在造孔性能及强度。原因在于,稀土的加入除提高污泥力学性能、除臭外,其内Al盐成分与污泥中H+反应,生成微量H2,在透水砖成型过程中形成孔隙,孔隙的形成有利于氧气进入砖体,从而加速污泥降解速度,污泥的有效降解增加透水砖的孔隙率,从而提高其透水性能;此外,稀土尾矿还富含Si、Al氧化物,可在后续受NaOH碱激发作用,生成C-S(A)-H产生胶凝作用,提高砖体强度。
本发明以建筑废弃物为骨料、粉煤灰-水泥为污泥胶凝材料,加入市政污泥与稀土尾渣,制备非烧结透水砖,污泥在砖体内的自然降解形成了许多空洞,提高了所制备砖体的透水性能,具有良好的环境效益和经济效益。
附图说明
图1为本发明的工艺流程图。
具体实施方式
以下实施例除非有特别的说明,其废水处理厂脱水污泥为采用A2/O工艺处理的脱水污泥,其含水率81.90%,pH 6.1,有机质含量63.70%。稀土尾矿中的Si、O、Al元素含量分别为47.12wt%、35.27wt%以及7.20wt%。
实施例1,
如图1所示,该实施例的利用市政污泥制备非烧结透水砖的方法,包括以下步骤:
(1)取上海市废水处理厂脱水污泥(含水率82%)、建筑废弃物及粉煤灰作为透水砖原料备用;其中,建筑废物需进行初步破碎预处理得到透水砖制备骨料。
①将所取建筑废物使用颚式破碎机破碎后,进一步使用圆盘破碎机进行破碎,得到再生粗骨料;
②将上述所得再生粗骨料过10目筛,即2mm粒径(该粒径可替代天然砂石作为骨料)的筛上物作为透水砖制备骨料。
(2)取粉煤灰与水泥按2:3质量比混合后,作为无机胶黏材料,再将无机胶黏材料以1:3质量比与步骤(1)的透水砖制备骨料混合得到第一混合物料。
(3)配制6.25*10-2mol/L的NaOH溶液,作为无机胶黏材料的激发剂。
(4)将上海市废水处理厂脱水污泥(含水率82%)与稀土尾渣以5:1质量比混合均匀,按3.6%质量比迅速加入到步骤(2)所得的第一混合物料,混合均匀得到第二混合物料。
(5)将步骤(4)所获得的第二混合物料与步骤(3)配制的NaOH溶液以5:1的质量比加入搅拌机中,以1000rpm转速搅拌1min,使其充分混合。
(6)将搅拌后的混合材料倒入模具,制得砖坯,经过28d的自然养护后,制得透水砖。
其透水砖中包含废水处理厂脱水污泥5-10wt%,稀土尾矿1-2wt%,建筑废弃物60-70wt%,粉煤灰8-12wt%,水泥15-18wt%。
透水砖抗压等级可达MU30,即抗压强度最小可达24MPa,平均值可达30MPa,透水系数达3.7×10-2cm/s,达到透水砖透水系数需大于1×10-2cm/s的设计要求。
实施例2
该实施例与实施例1不同的是,透水砖骨料与最后透水砖成型方式不同,具体包括以下步骤:
(1)取上海市某废水处理厂脱水污泥(含水率82%)、钢渣及粉煤灰作为透水砖原料备用;其中,钢渣进行初步过筛预处理得到透水砖制备骨料。
钢渣进行初步过筛预处理得到透水砖制备骨料的方法是:将钢渣料过10目筛,即2mm粒径(该粒径可替代天然砂石作为骨料)的筛上物作为透水砖制备骨料。相对于实施例1,钢渣具有力学强度高,前期破碎耗能小的特点。
(2)取粉煤灰与水泥按2:3质量比混合后,作为无机胶黏材料,再将无机胶黏材料以1:3质量比与步骤(1)的透水砖制备骨料混合得到第一混合物料。
(3)配制6.25*10-2mol/L的NaOH溶液,作为无机胶黏材料的激发剂。
(4)将上海市废水处理厂脱水污泥(含水率82%)与稀土尾渣以5:1质量比混合均匀,按3.6%质量比迅速加入到步骤(2)所得的第一混合物料,混合均匀得到第二混合物料。
(5)将步骤(4)所获得的第二混合物料与步骤(3)配制的NaOH溶液以5:1的质量比加入搅拌机中,以1000rpm转速搅拌1min,使其充分混合。
(6)将搅拌后的混合材料倒入模具,制得砖坯,经过28d的自然养护后,制得透水砖。
透水砖中包含废水处理厂脱水污泥5-10wt%,稀土尾矿1-2wt%,钢渣60-70wt%,粉煤灰8-12wt%,水泥15-18wt%。
透水砖抗压等级可达MU30,即抗压强度最小可达24MPa,平均值可达30MPa,透水系数达3.7×10-2cm/s,达到透水砖透水系数需大于1×10-2cm/s的设计要求。
上述的对实施例的描述是为便于该技术领域的普通技术人员能理解和应用本发明。熟悉本领域技术的人员显然可以容易地对这些实施做出各种修改,并把在此说明的一般原理应用到其他实施例中而不必经过创造性的劳动。因此,本发明不限于这里的实施例,本领域技术人员根据本发明的揭示,对于本发明做出的改进和修改都应该在本发明的保护范围之内。
Claims (1)
1.一种利用市政污泥制备非烧结透水砖的方法,其特征在于,包括如下步骤:
(1)取废水处理厂脱水污泥、建筑废弃物或钢渣及粉煤灰作为透水砖原料备用;其中,建筑废物进行初步破碎预处理得到透水砖制备骨料;所述废水处理厂脱水污泥为采用A2/O工艺处理的脱水污泥,其含水率81.90%,pH6.1,有机质含量63.70%;
所述建筑废物进行初步破碎预处理得到透水砖制备骨料的步骤如下:
(1.1)将所取建筑废物使用颚式破碎机破碎后,进一步使用圆盘破碎机进行破碎,得到再生粗骨料;
(1.2)将步骤(1.1)得到的再生粗骨料过10目筛,即2mm粒径的筛上物作为透水砖制备骨料;
(2)取粉煤灰与水泥按2:3质量比混合后制成无机胶黏材料,再将制备的无机胶黏材料以1:3的比例与步骤(1)制备的透水砖制备骨料混合得到第一混合物料;
(3)配制6.25×10-2mol/L的NaOH溶液,作为无机胶黏材料的激发剂备用;
(4)将步骤(1)的废水处理厂脱水污泥与稀土尾矿以5:1质量比混合均匀,按3.6%质量比迅速加入到步骤(2)所得的第一混合物料,混合均匀得到第二混合物料;稀土尾矿中的Si、O、Al元素含量分别为47.12wt%、35.27wt%以及7.20wt%;
(5)将步骤(4)所获得的第二混合物料与步骤(3)配制的NaOH溶液以5:1的质量比加入搅拌机中,以1000rpm转速搅拌1min,使其充分混合得到第三混合物料;
(6)将步骤(5)制备的第三混合材料倒入模具,制得砖坯,经过28d的自然养护后,制得透水砖;所述透水砖中包含废水处理厂脱水污泥5-10wt%,稀土尾矿1-2wt%,建筑废弃物或钢渣60-70wt%,粉煤灰8-12wt%,水泥15-18wt%。
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