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

作　　者：张晓伟 卢欣雨[1,2] 刘彦 ZHANG Xiaowei;LU Xinyu;LIU Yan(Key Laboratory of Leather Chemistry and Engineering of Ministry of Education,Sichuan University,Chengdu 610065,China;College of Biomass Science and Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[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

出　　处：《皮革科学与工程》2024年第3期66-72,93,共8页Leather Science and Engineering

基　　金：四川省科技计划重点研发项目(2022 YFS0463)。

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。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.

关 键 词：亚临界水 铬革屑 水解 铬渣 浸出毒性 

分 类 号：X794[环境科学与工程—环境工程]