A high value utilization process for coal gasification slag: Preparation of high modulus sodium silicate by mechano-chemical synergistic activation
文献类型：期刊论文
| 作者 | Qu, Jiangshan1,2; Zhang, Jianbo1; Li, Huiquan1,2; Li, Shaopeng1 |
| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2021-12-20 |
| 卷号 | 801页码:9 |
| ISSN号 | 0048-9697 |
| 关键词 | Coalgasification coarse slag Amorphous silica High modulus Sodium silicate Activation Depolymerization |
| DOI | 10.1016/j.scitotenv.2021.149761 |
| 英文摘要 | Coal 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. |
| WOS关键词 | ORDERED MESOPOROUS SILICA ; FLY-ASH ; ALKALI ACTIVATION ; RESIDUAL CARBON ; ACID ACTIVATION ; WASTE GLASS ; IR ; REACTIVITY ; GEOPOLYMER ; SI-29 |
| 资助项目 | National 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研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000704389400010 |
| 资助机构 | National Nature Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences China |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/50509]  |
| 专题 | 中国科学院过程工程研究所 |
| 通讯作者 | Zhang, Jianbo |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：过程工程研究所
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