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A high value utilization process for coal gasification slag: Preparation of high modulus sodium silicate by mechano-chemical synergistic activation
Qu, Jiangshan1,2; Zhang, Jianbo1; Li, Huiquan1,2; Li, Shaopeng1
2021-12-20
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume801Pages:9
AbstractCoal gasification coarse slag (CGCS) is solid waste generated during coal gasification. Themainly treatmentmethod of CGCS is storage and landfill, which causes severe environmental pollution and waste of land resources. Sodium silicate can be synthesized using CGCS after impurities are removed for the high content of amorphous silica. In this work, a novel method of acid activation depolymerization-dilute alkali dissociation is proposed to synthesize high-modulus, low-impurity sodiumsilicate using CGCS undermild conditions. In the acid activation depolymerization process, the content of impurities such as CaO and Fe2O3 can be reduced from over 30% to below 3%. SiO2 composition can be enriched from 35.75% to 60.60%. The Si-O-Al bond is broken, the coordination structures of Q(4)(2Al) and Q(4)(3Al) are depolymerized, and the reactive Q(4)(0Al) and Q(3)(0Al) coordination structures of amorphous silica are formed. Numerous defects appear in the aluminosilicate structure, exposing a large number of active Si-O-H bonds. Efficient desilicated ratio is increased from 7.59% to 73.45%. During the process of dilute alkali dissociation, a large number of reactive Si-O-Si bonds with network structure defects are broken with the destruction of hydroxyl groups, while Si-O- and Si-OH bonds are formed. Amorphous silica is leached into the liquid phase in the formof oligomers, and high-modulus sodiumsilicate can be obtained. Under optimal conditions, the removal ratio of amorphous silica andmodulus of sodium silicate can reach 80% and 3.53, respectively. The synthesized sodiumsilicate can be used to produce hydrated silica, adhesives and surface coatings. This process not only reduces pollution, but also alleviates the shortage of high-purity quartz sand resources and promotes the clean development of coal chemical enterprises. (C) 2021 Elsevier B.V. All rights reserved.
KeywordCoalgasification coarse slag Amorphous silica High modulus Sodium silicate Activation Depolymerization
DOI10.1016/j.scitotenv.2021.149761
Language英语
WOS KeywordORDERED MESOPOROUS SILICA ; FLY-ASH ; ALKALI ACTIVATION ; RESIDUAL CARBON ; ACID ACTIVATION ; WASTE GLASS ; IR ; REACTIVITY ; GEOPOLYMER ; SI-29
Funding ProjectNational Nature Science Foundation of China[51804293] ; National Nature Science Foundation of China[U1810205] ; Strategic Priority Research Program of the Chinese Academy of Sciences China[XDA21040601]
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
Funding OrganizationNational Nature Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences China
WOS IDWOS:000704389400010
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/50510
Collection中国科学院过程工程研究所
Corresponding AuthorZhang, Jianbo
Affiliation1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100090, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Qu, Jiangshan,Zhang, Jianbo,Li, Huiquan,et al. A high value utilization process for coal gasification slag: Preparation of high modulus sodium silicate by mechano-chemical synergistic activation[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,801:9.
APA Qu, Jiangshan,Zhang, Jianbo,Li, Huiquan,&Li, Shaopeng.(2021).A high value utilization process for coal gasification slag: Preparation of high modulus sodium silicate by mechano-chemical synergistic activation.SCIENCE OF THE TOTAL ENVIRONMENT,801,9.
MLA Qu, Jiangshan,et al."A high value utilization process for coal gasification slag: Preparation of high modulus sodium silicate by mechano-chemical synergistic activation".SCIENCE OF THE TOTAL ENVIRONMENT 801(2021):9.
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