摘要 |
PURPOSE:The titled additive capable of providing a coal-water slurry which is low in viscosity and excellent in storage stability, which comprises a polyoxyalkylene ether of a polyamine and an alkaline substance. CONSTITUTION:0.01-5wt% (based on a coal used) polyoxyalkylene ether, which has 50wt% or more oxyethylene group and a 3C or higher oxyalkylene group, a molecular weight of 40,000-300,000 and at least 900 oxyalkylene units, of a polyamine [e.g.: (alkyl)polyalkylene polyamine] having at least 5 active hydrogens (A) is mixed with 0.01-2wt% (based on a coal used) alkaline substance (B) selected from hydroxides, carbonates and/or silicates of alkaline metals, hydroxides of alkaline earth metals, NH4OH and amines in an (A)/(B) weight ratio of 999-1:1-999 to obtain the titled additive. The additive and optionally, a dispersant and an antifoamer are added to a water slurry of a 50-80wt% coal having a particle diameter of 3mm or less.
|