Effect of chemical properties of particle surface on the viscosity and cohesion behavior of coal slurry fuel(CSF).

1. 目的采用csf（煤浆燃料）模型，研究颗粒表面化学性质对黏性和黏聚性的影响。(1)用石墨-粘土矿物固相制备的com（煤油混合物）模型。模型- com由石墨作为碳质材料，粘土矿物（二氧化硅、氧化铝、高岭土和蒙脱土）作为灰，液态石蜡作为液相介质组成。模型com的黏度随二氧化硅和高岭土添加量的增加而增加，黏度随蒙脱土添加量的增加而逐渐降低。黏结力的增加顺序为：氧化铝<蒙脱土>高岭土<二氧化硅。粘土矿物吸油量大，粘土矿物黏度大，粘聚力大。(2)利用包覆有机羧酸的碳酸钙颗粒制备csf模型。研究了碳酸钙颗粒与脂肪酸和芳香族羧酸的反应。化学性质和表面亲水亲脂平衡随着化学种类和有机酸含量的变化而变化。因此，具有不同化学性质的颗粒具有相同的粒度、相同的粒度分布和相同的颗粒形状。在孔隙率相同的情况下，分别用颗粒和液体石蜡或水制备的COM和CWM的黏度和内聚行为受到颗粒表面化学性质差异的很大影响。粘度和内聚行为是通过测定所用颗粒的液体吸收量来估计的。

1. Objective By using model-CSF(coal slurry fuel), effect of chemical properties of particle surface on viscosity and cohesion behavior was investigated.2. Results and Discussion (1) Model-COM(coal oil mixture) by use of graphite-clay mineral solid phase. Model-COM consisted of graphite as a carbonaceous material, clay minerals(silica, alumina, kaoline and montmorillonite) as ashes, and liquid paraffin as liquid phase medium. The viscosity of the model-COM increased with increasing amount of silica and kaoline added, whereas its viscosity decreased gradually with increasing amount of montmorillonite added. The cohesion was increased in the order of materials added: alumina< montmorillonite < kaoline < silica. The clay minerals being capable of large oil-absorption tended to cause large viscosity and cohesion.(2) Model-CSF by use of calcium carbonate particle coated with organic carboxylic acids.Calcium carbonate particles were reacted with fatty acids and aromatic carboxylic acids. The chemical properties and hydrophile-lipophile balance on the surface was varied by means of changes both in the chemical species and in the amount of organic acids. Thus, the particles having different chemical properties and having the same particle size, the same size distribution, and the same particle shape. The viscosity and cohesion behavior of COM and CWM prepared with the particles and liquid paraffin or water, respectively, were found to be greatly influenced by difference in the chemical properties of the particle surface, nevertheless the CSF having the same porosity. The viscosity and cohesion behavior were found to be estimated by determining the liquid absorption of the particles used.