High strength clean briquettes production by using recycling coal fines is of great realistic significance in saving coal resources and protecting the environment. Blends consisting of a long‐flame coal fines and coal slime (CS) and polyvinyl alcohol (PVA) as binders were used in the preparation of briquettes. To produce a qualified clean briquette with enough briquette strength, the effects of the binder content, briquetting pressure, and moisture content were systemically investigated. The results indicated that the briquettes prepared by using blended binder with 20 wt.% of CS and 1 wt.% of PVA showed better compressive strength (10.2 MPa) and drop strength (98.3%). CS with particle size less than 0.2 mm could fill in the gap between the coarse coal particles uniformly, thus reinforcing the embedded state and leading to a higher briquette strength. Moreover, the strength of the briquettes was also affected by the briquetting pressure and moisture content. At briquetting pressure of 60 kN and optimum moisture content of 14%, the highest briquette strength was achieved. The hydroxyl content of the briquettes by adding CS and PVA increased significantly. In this condition, a highly viscous network colloid was formed when the PVA and water were mixed together. When the briquettes were dried, the colloid could produce a dendritic structure, which was mechanically embedded between adjacent coal particles.

中文翻译：

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使用聚乙烯醇和煤泥作为粘合剂，由长焰煤粉生产高强度清洁型煤

利用回收的煤粉生产高强度洁净煤球，对节约煤炭资源，保护环境具有重要的现实意义。团块的制备使用了由长焰煤粉和煤泥（CS）和聚乙烯醇（PVA）组成的混合物。为了生产具有足够的团块强度的合格的洁净团块，系统地研究了粘合剂含量，团块压力和水分含量的影响。结果表明，通过使用具有20重量％的CS和1重量％的PVA的混合粘合剂制备的团块显示出更好的抗压强度（10.2MPa）和下落强度（98.3％）。粒径小于0.2 mm的CS可以均匀地填满粗煤颗粒之间的间隙，因此增强了嵌入状态并导致了更高的团块强度。此外，团块的强度也受到团块压力和水分含量的影响。在团块压力为60 kN且最佳水分含量为14％时，可获得最高的团块强度。通过添加CS和PVA，团块的羟基含量显着增加。在这种条件下，当PVA和水混合在一起时会形成高粘度的网络胶体。当团块干燥后，胶体会产生树枝状结构，该树枝状结构机械嵌入在相邻的煤颗粒之间。煤球强度最高。通过添加CS和PVA，团块的羟基含量显着增加。在这种条件下，当PVA和水混合在一起时会形成高粘度的网络胶体。当团块干燥后，胶体会产生树枝状结构，该树枝状结构机械嵌入在相邻的煤颗粒之间。煤球强度最高。通过添加CS和PVA，团块的羟基含量显着增加。在这种条件下，当PVA和水混合在一起时会形成高粘度的网络胶体。当团块干燥后，胶体会产生树枝状结构，该树枝状结构机械嵌入在相邻的煤颗粒之间。