Preparation and properties of a decarbonized coal gasification slag–fly ash filling material

Shao, Xiaoping; Xu, Baowa; Tang, Renlong; Fang, Zhiyu; Tian, Chuang; Ning, Jianbo; Long-qing, LI

doi:10.1007/s11356-023-25382-1

Cited by 3 publications

(1 citation statement)

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“…Currently, the most widely used cementing materials in mines are still various types of cement, and the material cost of cement in the filling process accounts for 60%-80% [4]. Therefore, the study of cheap cementing materials suitable for mine filling is in line with the development trend of mine resource utilization and economy [5]. The application of waste slag from various metallurgical fields and thermal power plants to develop new cementing materials is a hot research topic at present [6][7][8][9][10], which has important practical significance for enterprises to reduce costs, increase efficiency, and improve economic benefits.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Ratio and Hydration Mechanism of Titanium-Extracted Residual Slag-Based Filling Cementitious Materials

Li,

Hao

et al. 2024

Minerals

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Using metallurgical solid waste Titanium-extracted Residual Slag (TRS) as mine-filling cementitious material is crucial to reduce the filling cost and promote the utilization of solid waste resources. In this paper, taking the strength of the backfill at different curing ages as the response target, the Design-expert mixing design was used to optimize the proportioning experiment of titanium-extracted residual slag, titanium gypsum, silicate cement, and total tailings, to analyze the interactions and influences of the materials on the strength of the backfill, and to analyze the hydration mechanism of the titanium-extracted residual slag-based filling cementitious materials under the optimal proportioning. The results show that: (1) the order of the sensitivity of each component to the strength of backfill is: composite activator > cement > titanium gypsum > titanium-extracted residual slag, and there are different degrees of interaction between them; (2) the optimal ratio of titanium-extracted residual slag-based filling cementitious materials is TRS:titanium gypsum:cement:composite activator = 55:25:17:3; (3) early strength formation of backfill is mainly related to its hydration products ettringite and C-S-H, the rapid nucleation and cross-growth of ettringite in the early stage forms an effective physical filling effect, which is the main reason for the formation of high early strength, and the later strength of backfill benefited from the continuous accumulation of C-S-H encapsulation and bonding, which further densified its internal structure; (4) the use of titanium-extracted residual slag-based filling cementitious materials contributes to safe, green, and economic mining.

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