| 摘要 |
PURPOSE:To provide the title additive which exhibits an excellent effect on the stable dispersion of coal in water and helps to produce a long-life, high- concn. coal-water slurry of low viscosity and which comprises a mixture of two types of partially sulfonated polystyrenes having different MWs. CONSTITUTION:An additive comprising a partially sulfonated polystyrene or a salt thereof obtd. by partially sulfonating a mixture of a PS having an MW (wt.-average MW) of 400-10,000 (A) and a PS having an MW (wt.-average MW) of 40,000-500,000 (B), pref. 50,000-150,000, is used in the manufacture of a high-concn. coal-water slurry comprising pulverizing coals in the presence of water. This additive exhibits an excellent effect on the stable dispersion of coals in water. When this additive is added to a coal-water slurry, the slurry does not suffer any changes for a prolonged period of time. Even if the slurry is allowed to stand still over a month, neither coagulation nor deposition is observed. Thus, a long-life, self-fluid, high-concn. coal-water slurry having such a low viscosity as the permit pumping is obtd. by the use of this additive.
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