MATEC Web Conf.
Volume 108, 20172017 International Conference on Mechanical, Aeronautical and Automotive Engineering (ICMAA 2017)
|Number of page(s)||4|
|Section||Material Analysis and Processing|
|Published online||31 May 2017|
Utilization of slaughter plant waste proteins in gypsum retarder: A case study
1 Department of Chemical Engineering, Hebei University of Science & Technology, Shijiazhuang, 050018, China
2 Hebei Engineering Research Center of Solid Waste Utilization, Shijiazhuang, 050000, China
Slaughter plant waste proteins contain animal hair, bones, nails etc. Improper treatment will pollute the environment and result in waste of resources. A process is proposed to prepare gypsum retarder from such waste, firstly through hydrolysis at acidic condition, and then neutralized with alkalis. The optimal conditions for acid hydrolysis are obtained: concentration of HCL 4.8 mol/L, reaction temperature 98 °C, reaction time 7 h. After neutralization (to pH=7), the product can be used as gypsum retarder (retarder A). Compared with commonly used retarder, citric acid, the mechanical strength loss of gypsum paste containing retarder A is much lower. It is a cost-effective approach for safe utilization of slaughter plant waste proteins.
© The Authors, published by EDP Sciences, 2017
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