Evaluation of aluminum ash in alleviating the ash deposition of high-sodium and high-iron coal

Zhou, Shangkun; Wang, Meng; Tan, Houzhang; Wang, Xuebin; Wen-jun, Yang; Xiong, Xiaohe; Yang, Fuxin

doi:10.1016/j.fuel.2020.117701

Cited by 39 publications

(4 citation statements)

References 20 publications

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“…According to relevant studies and literature, it is known that the iron-silicon ratio and the calcium-silicon ratio have a significant impact on the melting point of mixed slag [24][25][26]. The iron-silicon ratio refers to the weight ratio of iron to silicon in the furnace charge.…”

Section: Selection Of Key Process Parametersmentioning

confidence: 99%

Optimization of Zinc Smelting Slag Melting Point Based on Catboost and Improved Snake Optimization Algorithm

Kong,

Liu

2024

Applied Sciences

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The regulation of the melting point of zinc smelting slag has an important impact on the subsequent smelting processes of the metal. In actual production, uncontrollable melting points may result in inconsistent product quality, which has a great negative impact on the smelter’s efficiency and environmental protection. However, the regulation mechanism of the melting point of the smelting slag is complex, with many influencing factors, and there is no recognized high-precision calculation method. In response to these challenges, this study introduces an innovative approach for optimizing the melting point of zinc smelting slag based on the improved Snake Optimization (ISO) algorithm. The melting point of zinc smelting slag is modeled using the Catboost algorithm, and the model parameters are optimized using the Tree-structured Parzen Estimator (TPE) to improve the accuracy of the model. Next, the ISO algorithm is employed to conduct optimization calculations, determining the optimal values of various production process parameters that minimize the melting point. The effectiveness of this approach was evaluated using diverse modeling algorithms and test functions, subsequently applied to optimize and validate actual production data from a smelter in Shaanxi, China. Statistical analyses reveal that the TPE-optimized Catboost model exhibits an R2 of 93.89%, an RMSE of 7.02 °C, an MAE of 6.19 °C, and an MRE of 7.88%, surpassing performance metrics of alternative algorithms. Regarding optimization efficacy, the proposed ISO algorithm achieves an average reduction of 65 °C in the melting point and demonstrates superior robustness compared to both actual production data and alternative algorithms.

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Section: Selection Of Key Process Parametersmentioning

confidence: 99%

Optimization of Zinc Smelting Slag Melting Point Based on Catboost and Improved Snake Optimization Algorithm

Kong,

Liu

2024

Applied Sciences

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“…13 Under different climatic conditions, salts (e.g., NaCl, KCl and NaF) and toxic nonmetal ions (e.g., fluoride, CN − and NH 4 + ) in SAA can easily penetrate soils, which may put human health and environmental safety at risk. 14 In addition, when exposed to the external environment, SAA reacts with water and water vapor to slowly release gases. 15 At present, secondary aluminum ash in our country is mainly disposed of by stacking and landfilling, which seriously causes environmental pollution and waste of resources.…”

Section: Introductionmentioning

confidence: 99%

“…): Electrostatic attraction:AlOOHH + + F − → FHHOOAl (10) CaOOHH + + F − → FHHOOCa (11) HOOC(CH) 2 (OH) 2 COOH + F − → HOOC(CH) 2 (OH) 2 COOHF (12)Surface coordination:AlOOH + F − → HOOAl − F (13)CaOOH + F − → HOOCa − F(14) …”

mentioning

confidence: 99%

High value-added utilization of secondary aluminum ash & carbide slag: preparation of a high-performance adsorbent for rapid removal of fluoride from wastewater

Ren

Chen

et al. 2023

React. Chem. Eng.

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“…[5][6][7] As stated, sodium species tend to volatilize at high temperatures, which can bring about many serious ash-related problems inside reactors. 8 Due to this characteristic, sodium-rich coals have been widely investigated in coal combustion, 9,10 coal pyrolysis, 11,12 and coal gasification for better utilization. 13,14 In addition, sodium-rich coals are also viewed as potential raw materials for direct coal liquefaction (DCL), which is an efficient, clean coal technology.…”

Section: Introductionmentioning

confidence: 99%

Structural changes of Zhundong coal matrix induced by thermal treatment and its effects on oil yield in direct coal liquefaction

Han

2021

Intl J of Energy Research

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Sodium-rich coals are suitable raw materials for direct coal liquefaction (DCL).However, sodium species in coals, especially exchangeable ones, can significantly reduce oil yield. In this work, to increase oil yield in direct liquefaction of sodium-rich coals, a feasible method using organic solvents to pretreat sodium-rich coals is proposed. Initially, sodium-rich coal was thermally treated with tetralin or 1-methylnaphtalene. Then, raw coal and all the treated coals were liquefied under the same conditions to evaluate the effects of thermal treatment on structural changes of coal molecules and oil yield. The results show that surface areas of the treated coals increased to 7.86 m 2 /g at most, which was favorable for combination between hydrogen and coal molecules during the DCL process. More importantly, the content of hydrogen in the treated coals was 0.95 wt% higher than that of raw coal on average, suggesting that treated coals could be later liquefied at mild conditions. Raman spectra demonstrated that during thermal treatment with tetralin, small aromatic ring systems in raw coal were prehydrogenated and transformed into nonaromatic systems. The pre-hydrogenation of the coal matrix definitely contributes to the increase in oil yield. In view of sodium species distribution in the treated coals, it is proved that tetralin can promote the transformation of exchangeable sodium species into other chemical forms more easily than 1-methylnaphtalene, which implies that tetralin has more positive effects on the increase of oil yield. Compared with that of raw coal, oil yields in direct liquefaction of the samples treated by tetralin increase by 14.0 to 15.1 wt% (daf).

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Evaluation of aluminum ash in alleviating the ash deposition of high-sodium and high-iron coal

Cited by 39 publications

References 20 publications

Optimization of Zinc Smelting Slag Melting Point Based on Catboost and Improved Snake Optimization Algorithm

Optimization of Zinc Smelting Slag Melting Point Based on Catboost and Improved Snake Optimization Algorithm

High value-added utilization of secondary aluminum ash & carbide slag: preparation of a high-performance adsorbent for rapid removal of fluoride from wastewater

Structural changes of Zhundong coal matrix induced by thermal treatment and its effects on oil yield in direct coal liquefaction

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