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Article

Improving Fly Ash Brightness with Carbon and Iron Oxide Removal

State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, China
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Recycling 2020, 5(1), 5; https://doi.org/10.3390/recycling5010005
Received: 6 January 2020 / Revised: 20 February 2020 / Accepted: 27 February 2020 / Published: 3 March 2020
In this paper, the brightness of fly ash is improved by carbon removal by heating and iron-containing oxides removal by acid treatment using a two-step method to realize the application of fly ash as filler or coating in the future, which not only increases the range of resource utilization of fly ash, but also reduces dust pollution. The modification results show that the brightness of fly ash reaches the maximum value of 38.27% ISO (Brightness unit) after decarburization by heating at 600 °C. On this basis, the Box–Benhnken design scheme is adopted to optimize the brightening process for removing iron-containing oxides in fly ash. Finally, when the concentration of hydrochloric acid is 15%, the acid leaching time is 0.75 h, the reaction temperature is 74 °C, and the brightness of fly ash can eventually increase to 43.92% ISO. View Full-Text
Keywords: fly ash; carbon removal; iron-containing oxides removal; brightening modification fly ash; carbon removal; iron-containing oxides removal; brightening modification
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MDPI and ACS Style

Song, H.; Fan, H.; Gao, H.-t.; Liu, J.-a.; Mou, H. Improving Fly Ash Brightness with Carbon and Iron Oxide Removal. Recycling 2020, 5, 5. https://doi.org/10.3390/recycling5010005

AMA Style

Song H, Fan H, Gao H-t, Liu J-a, Mou H. Improving Fly Ash Brightness with Carbon and Iron Oxide Removal. Recycling. 2020; 5(1):5. https://doi.org/10.3390/recycling5010005

Chicago/Turabian Style

Song, Helong, Huiming Fan, Hang-tian Gao, Jian-an Liu, and Hongyan Mou. 2020. "Improving Fly Ash Brightness with Carbon and Iron Oxide Removal" Recycling 5, no. 1: 5. https://doi.org/10.3390/recycling5010005

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