Study on the Preparation and Activity Influencing Factors of Dried Yak Manure Incineration Ash
WANG Ke1, CAO Feng1,2,*, ZHANG Yiming1, XU Yanhang1
1 College of Civil and Transportation Engineering, Qinghai Minzu University, Xining 810000, China; 2 Qinghai Provincial Key Laboratory Energy and Environmental Engineering of Plateau, Xining 810000, China
Abstract: The utilization of air-dried yak dung as domestic fuel in high-altitude pastoral regions generates substantial combustion ash. Disposing of this material as general waste represents a significant waste of resources and creates considerable environmental pressure. Dried yak manure incineration ash (DYMIA), a potentially active biomass admixture, was synthesized from naturally combusted yak dung ash through the processes of grinding and calcination. First an orthogonal experimental design was conducted to prepare DYMIA under 27 different conditions. Subsequently the DYMIA samples prepared under varying conditions were subjected to analyses, including assessments of its macro- and micro-structural morphology, phase composition, crystallinity, and particle size distribution. Finally the parameters influencing the activity effect of DYMIA were optimized using response surface optimization combined with centroid orthogonal theory, while the order of its primary and secondary order was determined through grey relational analysis. The results indicate that DYMIA prepared under the conditions of a calcination temperature of 600 ℃, a calcination duration of 5 h, and a grinding time of 3 h exhibited the lowest crystallinity, the finest particle size, and the highest reactivity. Among which, the resulting sample contained 58.6% SiO2, exhibited a median particle size of 2.77 μm, and achieved a relative reactivity index as high as 66.79%. Calcination temperature was identified as the most influential factor affecting the reactivity of DYMIA and should be prioritized as a key control parameter during its preparation.
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2026, Vol. 40 
