特殊鋼渣超微粉改性廢棄核桃殼制備鋼渣基生物質活性炭及其吸收氯氣的性能

孫大為; 鄧軍

doi:10.13374/j.issn2095-9389.2020.08.04.004

特殊鋼渣超微粉改性廢棄核桃殼制備鋼渣基生物質活性炭及其吸收氯氣的性能

doi: 10.13374/j.issn2095-9389.2020.08.04.004

孫大為^{1, 2, 3},
鄧軍^{1, 3, ,}

1.
西安科技大學安全科學與工程學院，西安 710054
2.
西安高新技術產業開發區管理委員會，西安 710065
3.
陜西省煤火防治重點實驗室，西安 710054

基金項目: 國家自然科學基金資助項目（51774232）；國家重點研發計劃資助項目（2018YFC0807900）

詳細信息

通訊作者:
E-mail: dengj518@xust.edu.cn

中圖分類號: X753
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出版歷程
- 收稿日期: 2020-08-04
- 網絡出版日期: 2020-11-13
- 刊出日期: 2021-07-01

Chlorine gas absorption performance of steel-slag-based biomass-activated carbon prepared via modified discarded walnut shell

SUN Da-wei^{1, 2, 3},
DENG Jun^{1, 3
, ,}

1.
School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
2.
The Administrative Committee of Xi’an Hi-tech Industries Development Zone, Xi’an 710065, China
3.
Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi’an 710054, China

More Information

Corresponding author: E-mail: dengj518@xust.edu.cn

摘要

摘要: 以特殊鋼渣超微粉與廢棄核桃殼為研究對象，利用特殊鋼渣超微粉的化學成分對廢棄核桃殼進行改性處理制備鋼渣基生物質活性炭。研究廢棄核桃殼超微粉與特殊鋼渣超微粉的質量比、特殊鋼渣超微粉細度和吸附環境溫度對鋼渣基生物質活性炭吸收氯氣性能的影響。結果表明：廢棄核桃殼超微粉與特殊鋼渣超微粉的質量比為100∶6，特殊鋼渣超微粉的細度為600目，吸附環境溫度為30 ℃時鋼渣基生物質活性炭吸收氯氣性能較好。特殊鋼渣超微粉中Fe₂O₃具有磁性有利于氯氣在鋼渣基生物質活性炭表面形成富集，提高其吸附能力，CuO和MnO具有催化性可以協助促進鋼渣基生物質活性炭的吸附能力。特殊鋼渣超微粉細度過大，會造成小粒徑顆粒團聚，從而影響鋼渣基生物質活性炭對氯氣的吸附能力進一步提高；在特殊鋼渣超微粉粒徑較小時，均勻性較好的特殊鋼渣超微粉對提高鋼渣基生物質活性炭吸附氯氣較小。較高的吸附環境溫度可能導致鋼渣基生物質活性炭對氯氣出現解析現象；同時鋼渣基生物質活性炭表面沒有出現特殊鋼渣超微粉團聚與沉積的現象，具有層狀結構特征，為吸附氯氣提供了空間。
- 特殊鋼渣超微粉 /
- 廢棄核桃殼 /
- 生物質活性炭 /
- 氯氣 /
- 冶金固廢
Abstract: Discarded walnut shells were modified by the chemical composition of special steel slag ultrafine powder to obtain steel-slag-based biomass-activated carbon. The influences of the mass ratio of discarded walnut shell ultrafine powder and special steel slag ultrafine powder, the fineness of special steel slag ultrafine powder, and adsorption ambient temperature on the absorbed chlorine gas performance of steel-slag-based biomass-activated carbon were studied. Results show good chlorine gas absorption performance when the mass ratio of discarded walnut shell ultrafine powder and special steel slag ultrafine powder is 100∶6, the fineness of special steel slag ultrafine powder is 600 mesh, and adsorption ambient temperature is 30 ℃. The magnetic property of Fe₂O₃ in special steel slag ultrafine powder is conducive to the formation and enrichment of chlorine gas on the surface of steel-slag-based biomass-activated carbon, improving its absorption performance. Catalytic performance of CuO and MnO helps promote the absorbing performance of steel-slag-based biomass-activated carbon. When the fineness of special steel slag ultrafine powder is excessively large, agglomeration of small particle size occurs and affects the adsorption capacity of steel-slag-based biomass-activated carbon to chlorine gas. When the particle size of special steel slag ultrafine powder is small, the special steel slag ultrafine powder with good uniformity is less effective in improving the adsorption of chlorine on the steel-slag-based biomass-activated carbon. The higher adsorption ambient temperature may lead to the analytical phenomenon of chlorine gas from steel-slag-based biomass-activated carbon. Moreover, no superfine agglomeration and deposition of special steel slag ultrafine powder on the surface of steel-slag-based biomass-activated carbon are observed. The obtained carbon exhibits the layered structure characteristics and provides space for chlorine gas adsorption.
- special steel slag ultrafine powder /
- discarded walnut shell /
- biomass activated carbon /
- chlorine gas /
- metallurgical solid waste

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圖 1 特殊鋼渣超微粉的粒度分布。（a）細度為400目；（b）細度為500目；（c）細度為600目；（d）細度為700目；（e）細度為800目

Figure 1. Particle size distribution of special steel slag: (a) fineness of 400 mesh; (b) fineness of 500 mesh; (c) fineness of 600 mesh; (d) fineness of 700 mesh; (e) fineness of 800 mesh

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圖 2 生物質活性炭與鋼渣基生物質活性炭的微觀形貌。（a）生物質活性炭；（b）鋼渣基生物質活性炭（廢棄核桃殼超微粉與特殊鋼渣超微粉的質量比分別為100∶6，特殊鋼渣超微粉的細度為600目）

Figure 2. Microstructure of biomass-activated carbon and steel-slag-based biomass-activated carbon: (a) biomass activated carbon；(b) steel-slag-based biomass-activated carbon (the mass ratio of discarded walnut shell ultrafine powder and special steel slag ultrafine powder is 100∶6 and fineness of special steel slag ultrafine powder is 600 mesh)

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表 1 廢棄核桃殼超微粉與特殊鋼渣超微粉的質量比對鋼渣基生物質活性炭的影響

Table 1. Effect of the mass ratio of discarded walnut shell ultrafine powder and special steel slag ultrafine powder on steel-slag-based biomass-activated carbon

Mass ratio	Chlorine adsorption capacity in different pressures/%
Mass ratio	0 MPa	0.02 MPa	0.04 MPa	0.08 MPa	0.16 MPa	0.24 MPa
100∶0	0	4.06	7.52	16.75	21.81	28.39
100∶2	0	4.75	8.32	18.14	23.62	30.15
100∶4	0	5.48	9.53	20.65	26.89	34.35
100∶6	0	5.94	10.07	21.47	27.93	35.16
100∶8	0	5.69	9.83	20.52	26.36	34.02
100∶10	0	5.25	9.75	20.60	26.31	33.36

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表 2 特殊鋼渣超微粉的化學成分（質量分數）

Table 2. Chemical composition of special steel slag ultrafine powder %

CaO	SiO₂	Al₂O₃	MgO	Fe₂O₃	Cr₂O₃	PbO	P₂O₅	CuO	MnO	Other
53.05	23.61	8.33	7.52	1.92	1.04	0.79	0.43	0.41	0.40	2.50

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表 3 鋼渣基生物質活性炭的孔結構

Table 3. Pore structure of steel-slag-based biomass-activated carbon

Mass ratio	Pore structure/ (cm³·g^?1)	Specific surface area/ (m²·g^?1)	Average pore size/nm
100∶0	0.72	996	11.05
100∶2	0.72	975	11.02
100∶4	0.71	960	10.96
100∶6	0.68	953	10.87
100∶8	0.63	907	10.44
100∶10	0.56	835	10.23

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表 4 特殊鋼渣超微粉細度對鋼渣基生物質活性炭的影響

Table 4. Effect of the fineness of special steel slag ultrafine powder on steel-slag-based biomass-activated carbon

Fineness (mesh)	Chlorine adsorption capacity in different pressures/%
Fineness (mesh)	0 MPa	0.02 MPa	0.04 MPa	0.08 MPa	0.16 MPa	0.24 MPa
400	0	5.15	9.17	19.63	25.47	32.51
500	0	5.42	9.50	20.26	26.22	33.84
600	0	5.94	10.07	21.47	27.93	35.16
700	0	5.95	10.15	21.80	28.25	35.22
800	0	6.03	10.23	21.95	28.56	35.91

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表 5 特殊鋼渣超微粉的均勻性

Table 5. Uniformity of special steel slag

Fineness (mesh)	d₁₀	d₅₀	d₉₀	d₉₀/d₁₀	(d₉₀ ? d₁₀)/d₅₀
400	7.49	17.65	33.09	4.42	1.45
500	4.31	11.11	23.97	5.56	1.77
600	3.21	9.69	22.89	7.13	2.03
700	10.34	15.16	21.95	2.12	0.77
800	6.00	10.78	17.62	2.94	1.08

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表 6 吸附環境溫度對鋼渣基生物質活性炭的影響

Table 6. Effect of adsorption ambient temperature on steel-slag-based biomass-activated carbon

Adsorption ambient temperature/ ℃	Chlorine adsorption capacity in different pressure/%
Adsorption ambient temperature/ ℃	0 MPa	0.02 MPa	0.04 MPa	0.08 MPa	0.16 MPa	0.24 MPa
20	0	6.02	10.60	22.86	28.47	36.34
30	0	5.94	10.07	21.47	27.93	35.16
40	0	5.31	9.83	19.84	25.32	32.40

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