基于亚临界技术的铬革屑水解工艺研究

doi:10.19677/j.issn.1004-7964.2024.03.010

皮革科学与工程 ›› 2024, Vol. 34 ›› Issue (3): 66-72.doi: 10.19677/j.issn.1004-7964.2024.03.010

基于亚临界技术的铬革屑水解工艺研究

张晓伟^1,2, 卢欣雨^1,2, 刘彦^*

1.四川大学皮革化学与工程教育部重点实验室,四川成都 610065;
2.四川大学轻工科学与工程学院,四川成都 610065

收稿日期:2023-10-02 修回日期:2024-02-15 接受日期:2024-02-22 出版日期:2024-06-01 上线日期:2024-04-25
通讯作者: *刘彦（1964-）,女,博士,副教授,主要研究方向:制革含铬废弃物的资源化利用。E-mail:ly2680@163.com。
作者简介:张晓伟（1998-）,男,硕士研究生,主要研究方向:皮革固体废弃物资源化利用。E-mail:1141831589@qq.com。
基金资助:
四川省科技计划重点研发项目（2022 YFS0463）

Hydrolysis Process of Chrome Shavings based on Subcritical Technology

ZHANG Xiaowei^1,2, LU Xinyu^1,2, LIU Yan^1,2,*

1. Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China;
2. College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China

Received:2023-10-02 Revised:2024-02-15 Accepted:2024-02-22 Published:2024-06-01 Online:2024-04-25

摘要/Abstract

摘要： 通过单因素实验和正交试验优化,亚临界水解铬革屑最优工艺为:温度150 ℃、液比25、反应时间75 min、CaO用量6%。铬革屑水解率为（83.98±0.16）%。水解过程无废液产生,水解产物主要为多肽、短肽和少量氨基酸。水解产物的铬含量为（34.81±2.29）mg/kg,符合农业部有机肥铬含量标准,具有作为有机肥的应用前景。铬革屑水解产生的铬绝大部分沉积在铬渣中。铬渣浸出液的铬和六价铬含量分别为14.285 mg/L和1.544 mg/L,低于国家标准《危险废物鉴别标准浸出毒性鉴别》的限值,实现了铬革屑无害化处理。

关键词: 亚临界水, 铬革屑, 水解, 铬渣, 浸出毒性

Abstract: The hydrolysis of chromium shavings with subcritical water was studied by single factor experiments and optimized by orthogonal test. The optimized parameters were temperature of 150 ℃, liquid ratio of 25, reaction time of 75 min, and calcium oxide dosage of 6%. Under these conditions, the hydrolysis ratio of chromium shavings was (83.98 ± 0.16)%, and the chromium content of the hydrolysate was (34.81 ± 2.29)mg/kg, which was lower than that of the organic fertilizer standard of the agriculture department. The main components of the hydrolysate were peptides and short peptide as well as a small amount of amino acids. The results indicated that the hexavalent chromium content of the hydrolysate and the solid residue were 1.317 mg/kg and 30.882 mg/kg, respectively, which means most of the chromium (trivalent and hexavalent) mainly exists in the solid residue. The leaching chromium content and the hexavalent chromium content in the solid residue were 14.285 mg/L and 1.544 mg/L, respectively, which were lower than the standard limits of “identification standard for hazardous wastes-identification for extraction toxicity”. These results indicate that subcritical water hydrolysis for chrome shavings is a really harmless treatment and resource utilization.

Key words: subcritical water, chromium shavings, hydrolysis, solid residue, leaching to xicity

中图分类号:

X794

张晓伟, 卢欣雨, 刘彦. 基于亚临界技术的铬革屑水解工艺研究[J]. 皮革科学与工程, 2024, 34(3): 66-72.

ZHANG Xiaowei, LU Xinyu, LIU Yan. Hydrolysis Process of Chrome Shavings based on Subcritical Technology[J]. Leather Science and Engineering, 2024, 34(3): 66-72.

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基于亚临界技术的铬革屑水解工艺研究

Hydrolysis Process of Chrome Shavings based on Subcritical Technology

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