1、水煤浆技术和水煤浆添加剂 Tab.1: The properties of NDF and of CWM with NDF No. 1 2 3 4 5 6 Items State Solid extent pH(25% aqueous liquid) extent of insoluble substance density(25% aqueous liquid) Flowability(the amounts of additive vs. the amounts of coal when the viscosity of 69.0 1.0% CWM reaches 1300 200 cp,
2、 100s-1, at 25 , ) (the amounts of additive vs. the amounts of coal when the viscosity of 65.0 1.0% CWM reaches 1000 200 cp, 100s-1, at 25 , ) 7 Rest stability(mean rate of settling 69 1% CWM with additive in 7d) % /d % % Measurements NDF-01 Yellow liquid 25.1 9.0 0.1 1.154 0.50 NDF-02 Brown liquid
3、25.0 9.0 0.2 1.200 0.58 g/cm3 % 0.08 0.18 0.16 no hard precipitation 0.18 no hard precipitation 0.16 8 Dynamic stability(mean rate of settling 69 1% CWM with additive in 24h at 30Hz, 1mm Amplitude) % /h 0.15 For reference: The above sample of coal is Dongtan coal with the same diametrical distribution. 7 结论 7.1 NDF具有对煤种适应性强、用量少和分散性好等 优点。用其制得的水煤浆浓度高、成本低和稳定性好。 7.2 吸附在煤表面的NDF,改善了煤水间的相容性, NDF的最佳用量为千分之二。 7.3 可以通过调节 NDF 的分子量、磺化率和羧基含量 使 NDF 处理煤 / 水界面张力及其各分量大小适中,保 证煤粒子相对稳定地分散在水中,制得合格的 CWM 。 7.4 对于 NDF 来讲,当分子量一定时,亲水基团的种 类是影响 CWM 的成浆性能的主要因素;同时,亲水 基团的数量也起着重要的影响作用。 7.5 煤中的高价金属影响CWM的成浆性和稳定性。 谢谢!