The study aims to understand the potential of Ca₃(PO₄)₂ for relieving the slagging propensity of Ca-, Na- and Fe-rich Zhundong coal blends. Firstly, the effect of varying proportion of Ca₃(PO₄)₂ on ash fusion temperatures of coal blends was studied. The experiment about cofiring coal blends with optimal blending ratio of Ca₃(PO₄)₂ was then conducted in a drop tubular furnace. The chemical composition, mineral phase and micro-morphology of slags or deposits collected on an un-cooling probe at different temperatures (1200, 1000, 800 and 600 °C) were characterized. The results show that the deformation and softening temperatures of coal blends with 3% Ca₃(PO₄)₂ can be increased by 200 °C and 150 °C, respectively. Without additive, the slags at 1200 °C appeared to be molten at a large proportion, which are mainly comprised of Fe₂O₃ and Si-Al-Ca mineral phases. While for coal blends with 3% Ca₃(PO₄)₂, the particles adhered to the probe at 1200 °C presented to be granular and the melting proportion sharply decreased. At 1000 °C the deposits became loose and easy to be removed off. This is mainly due to the fact that Ca₃(PO₄)₂ combining with Na- or Ca-containing components can transform into Ca₅(PO₄)₂SiO₄, Ca₇(PO₄)₂Si₂O₈ and Na₃Ca₆(PO₄)₅ with high melting point.

该研究旨在了解 Ca ₃ (PO ₄ ) ₂在缓解富含 Ca、Na 和 Fe 的准东混煤的结渣倾向方面的潜力。首先，研究了不同比例的Ca ₃ (PO ₄ ) ₂对混煤灰熔融温度的影响。Ca ₃ (PO ₄ ) ₂最佳配比共燃混煤试验然后在滴管式炉中进行。表征了在不同温度（1200、1000、800 和 600 °C）下在非冷却探头上收集的炉渣或沉积物的化学成分、矿物相和微观形态。结果表明，含3%Ca ₃ (PO ₄ ) _{2 的}混煤的变形温度和软化温度可分别提高200℃和150℃。在没有添加剂的情况下，1200 °C 的炉渣似乎以较大比例熔化，主要由 Fe ₂ O ₃和 Si-Al-Ca 矿物相组成。而对于含 3% Ca ₃ (PO ₄ ) _{2 的}混煤, 1200 °C 时粘附在探针上的颗粒呈颗粒状，熔解比例急剧下降。在 1000 °C 时，沉积物变得松散且易于去除。这主要是因为 Ca ₃ (PO ₄ ) ₂与含 Na 或 Ca 的成分结合可以转化为 Ca ₅ (PO ₄ ) ₂ SiO ₄、Ca ₇ (PO ₄ ) ₂ Si ₂ O ₈和 Na ₃ Ca ₆ (PO ₄ ) ₅具有高熔点。