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Converting leather chrome shaving waste into free-chrome char as a fuel

Article

Last updated: 01 Jan 2025

Subjects

-

Tags

Textile chemistry

Abstract

Chrome shaving wastes (CSW) are categorized as solid wastes with large quantities in tanneries, causing environmental damage when disposed by incinerating or landfilling. This study focused on converting CSW into free-chrome char that could be used as a fuel for energy production allowing recycling of recovered chrome again in leather processing. In this study, CSW were carbonized by incineration or pyrolysis at different temperatures (400, 500, 600 or 700℃). Thereafter, chrome was recovered from char using sulfuric, hydrochloric, or nitric acids at three level of concentrations (0.2M, 0.6M and 1.0M), soon after the recovered chrome was re-used for tanning pickled sheep skins' samples. The results showed that char yield was improved in pyrolysis and by the lowest temperature. Additionally, the increment in acid concentration and using sulfuric acid had the best effect for chrome recovery. Therefore, CSW pyrolysis at 400℃ produced the highest char yield (44.58%) with chrome recovery rate of > 88% when using sulfuric acid with concentration ≥ 0.6M. The produced char contained 5172 kcal/kg that could be used as fuel, as well as the recycled chrome was successfully re-used in leather tanning process with no changes in leather properties as compared with traditional chrome tanning.

DOI

10.21608/ejchem.2022.139066.6107

Keywords

Chromium sulfate, environment, Extraction, Pyrolysis, recycling

Authors

First Name

Ahmed

Last Name

Nasr

MiddleName

-

Affiliation

Wool Production and Technology Department, Desert Research Center, Cairo, Egypt

Email

ainasr@yahoo.com

City

-

Orcid

0000-0001-8422-8667

First Name

Mohammed

Last Name

Elshaer

MiddleName

Ahmed

Affiliation

Department of Agricultural Biochemistry, Faculty of Agriculture, Al-Azhar University, Cairo, Egypt

Email

elshaerazharuniv@yahoo.com

City

-

Orcid

-

First Name

Mohamed

Last Name

Abd-Elraheem

MiddleName

Awad

Affiliation

Department of Agricultural Biochemistry, Faculty of Agriculture, Al-Azhar University, Cairo, Egypt

Email

dryosefazhar@yahoo.com

City

-

Orcid

-

Volume

65

Article Issue

13

Related Issue

37459

Issue Date

2022-12-01

Receive Date

2022-05-17

Publish Date

2022-12-01

Print ISSN

0449-2285

Online ISSN

2357-0245

Link

https://ejchem.journals.ekb.eg/article_246553.html

Detail API

https://ejchem.journals.ekb.eg/service?article_code=246553

Order

246,553

Type

Original Article

Type Code

297

Publication Type

Journal

Publication Title

Egyptian Journal of Chemistry

Publication Link

https://ejchem.journals.ekb.eg/

MainTitle

Converting leather chrome shaving waste into free-chrome char as a fuel

Details

Type

Article

Created At

22 Jan 2023