Study on the Solidification and Forming Mechanism of Oily Sludge

doi:10.3969/j.issn.1006-396X.2022.02.002

Abstract

Abstract:

Taking oily sludge as the research object,this paper conducted solidification experiments with fly ash, clay, and laboratory?made liquid binder as a composite binder.It explored the effects of dosages (mass fractions) of binder components on the solidified block strength and determined the optimum dosage of the curing agent. The results show that the strength of the solidified block is the best in the case of the fly ash dosage of 30%,the clay dosage of 10% and the liquid binder dosage of 5%. Under the optimal process conditions, the cold strength of the solidified block is 2.19 MPa and the hot strength is 2.21 MPa, which indicates that it has sufficient cold strength and thermal stability. The forming mechanism of the solidified block was studied with the help of Fourier transform infrared spectroscopy (FT?IR),X?ray diffraction (XRD), and scanning electron microscopy (SEM). The forming mechanism of the solidified block was put forward according to the characterization results.

Key words: Oily sludge, Binder, Compressive strength, Forming mechanism

摘要：

以含油污泥为研究对象，粉煤灰、黏土、实验室自制液态黏结剂为复合黏结剂进行固化实验，探究不同黏结剂组分掺入量（以质量分数计）对固化块强度的影响，并确定最佳固化剂掺入量。结果表明，在粉煤灰掺入量30%、黏土掺入量10%、液态黏结剂掺入量5%的固化块强度达到最佳；在最佳工艺条件下，固化块的冷强度为2.19 MPa，热强度为2.21 MPa，具有足够的冷强度和热稳定性。利用傅里叶红外光谱（FT?IR）、X射线衍射（XRD）和扫描电子显微镜(SEM)等技术手段研究固化块的成型机理，并根据表征结果提出固化块成型机理。

关键词: 含油污泥, 黏结剂, 抗压强度, 成型机理

CLC Number:

TE624

Rui Cao, Dongyun Han, Zubin Cao. Study on the Solidification and Forming Mechanism of Oily Sludge[J]. Journal of Petrochemical Universities, 2022, 35(2): 9-14.

曹蕊, 韩冬云, 曹祖斌. 含油污泥的固化与成型机理研究[J]. 石油化工高等学校学报, 2022, 35(2): 9-14.

Figures/Tables 9

Table 1 Chemical composition of fly ash and clay

组分	质量分数/%
组分	粉煤灰	黏土
SiO₂	44.930	69.960
Al₂O₃	25.840	17.200
Fe₂O₃	9.248	3.841
CaO	9.239	2.467
P₂O₅	1.180	0.999
TiO₂	1.510	0.366
MgO	1.220	1.290
BaO	0.404	0.048

Fig.1 Effect of fly ash content on compressive strength of solidified block

Fig.2 Influence of the amount of curing agent added on the compressive strength of solidified block

Fig.3 Influence of liquid binder content on compressive strength of solidified block

Table 2 Analysis of residue composition of solidified block after heating

项目	控制值（范围）	检测值
含水率/%	60.00	0.34
pH	5.5~8.5	7.2
w（镉)/(mg $⋅$ kg^-1)	<15	6
w（铅)/(mg $⋅$ kg^-1)	<1 000	86
w（汞)/(mg $⋅$ kg^-1)	<15	0
w（镍)/(mg $⋅$ kg^-1)	<200	64
w（铬)/(mg $⋅$ kg^-1)	<1 000	130
w（砷)/(mg $⋅$ kg^-1)	<75	14
w（铜)/(mg $⋅$ kg^-1)	<1 500	21
w（铁)/(mg $⋅$ kg^-1)	-	410
w（矿物油)/(mg $⋅$ kg^-1)	<3 000	200

Table 2 Analysis of residue composition of solidified block after heating

项目	控制值（范围）	检测值
含水率/%	60.00	0.34
pH	5.5~8.5	7.2
w（镉)/(mg $⋅$ kg^-1)	<15	6
w（铅)/(mg $⋅$ kg^-1)	<1 000	86
w（汞)/(mg $⋅$ kg^-1)	<15	0
w（镍)/(mg $⋅$ kg^-1)	<200	64
w（铬)/(mg $⋅$ kg^-1)	<1 000	130
w（砷)/(mg $⋅$ kg^-1)	<75	14
w（铜)/(mg $⋅$ kg^-1)	<1 500	21
w（铁)/(mg $⋅$ kg^-1)	-	410
w（矿物油)/(mg $⋅$ kg^-1)	<3 000	200

Fig.4 XRD pattern of the cured block

Fig.5 SEM images of different sludges

Fig.6 Infrared spectroscopy of oily sludge and solidified lumps

Fig.7 The solidification process of sludge adding different binders

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