Improving Fly Ash Brightness with Carbon and Iron Oxide Removal
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 a...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2020-03-01
|
Series: | Recycling |
Subjects: | |
Online Access: | https://www.mdpi.com/2313-4321/5/1/5 |
id |
doaj-e7925f2092f149c09d387c7e9a8d8523 |
---|---|
record_format |
Article |
spelling |
doaj-e7925f2092f149c09d387c7e9a8d85232020-11-25T02:39:26ZengMDPI AGRecycling2313-43212020-03-01515010.3390/recycling5010005recycling5010005Improving Fly Ash Brightness with Carbon and Iron Oxide RemovalHelong Song0Huiming Fan1Hang-tian Gao2Jian-an Liu3Hongyan Mou4State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, ChinaState Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, ChinaState Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, ChinaState Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, ChinaState Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, ChinaIn 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.https://www.mdpi.com/2313-4321/5/1/5fly ashcarbon removaliron-containing oxides removalbrightening modification |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Helong Song Huiming Fan Hang-tian Gao Jian-an Liu Hongyan Mou |
spellingShingle |
Helong Song Huiming Fan Hang-tian Gao Jian-an Liu Hongyan Mou Improving Fly Ash Brightness with Carbon and Iron Oxide Removal Recycling fly ash carbon removal iron-containing oxides removal brightening modification |
author_facet |
Helong Song Huiming Fan Hang-tian Gao Jian-an Liu Hongyan Mou |
author_sort |
Helong Song |
title |
Improving Fly Ash Brightness with Carbon and Iron Oxide Removal |
title_short |
Improving Fly Ash Brightness with Carbon and Iron Oxide Removal |
title_full |
Improving Fly Ash Brightness with Carbon and Iron Oxide Removal |
title_fullStr |
Improving Fly Ash Brightness with Carbon and Iron Oxide Removal |
title_full_unstemmed |
Improving Fly Ash Brightness with Carbon and Iron Oxide Removal |
title_sort |
improving fly ash brightness with carbon and iron oxide removal |
publisher |
MDPI AG |
series |
Recycling |
issn |
2313-4321 |
publishDate |
2020-03-01 |
description |
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. |
topic |
fly ash carbon removal iron-containing oxides removal brightening modification |
url |
https://www.mdpi.com/2313-4321/5/1/5 |
work_keys_str_mv |
AT helongsong improvingflyashbrightnesswithcarbonandironoxideremoval AT huimingfan improvingflyashbrightnesswithcarbonandironoxideremoval AT hangtiangao improvingflyashbrightnesswithcarbonandironoxideremoval AT jiananliu improvingflyashbrightnesswithcarbonandironoxideremoval AT hongyanmou improvingflyashbrightnesswithcarbonandironoxideremoval |
_version_ |
1724786114249621504 |