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研究分析了焦炉SDA+SCR脱硫脱硝工艺产生的副产物焦炉脱硫灰的外观形貌、水溶性、粒径、化学组成及物相组成,并开展了焦炉脱硫灰应用于水泥混凝土的试验研究。结果表明:焦炉脱硫灰是一种轻质细粉状颗粒,平均粒径约为36.3μm,在水中具有可溶性,主要物相包括Na_2CO_3、Na_2CO_3·H_2O、Na_6(CO_3)(SO_4)_2和NaCl。将其以0.5%~2.0%的比例内掺入水泥,对水泥的标准稠度用水量略有降低,且有一定的缓凝作用。将其以0.5%~2.0%外掺入混凝土,对混凝土的1 d抗压强度略有提升,但会降低混凝土的7 d、28 d抗压强度。与Na_2SO_4早强剂相比,早强作用相对较弱,可进一步探索其用作混凝土早强剂的可行性。
The appearance, water solubility, particle size, chemical composition and phase composition of byproduct coke oven desulfurization ash produced by the desulfurization and denitrification process of coke oven SDA + SCR were studied and analyzed, and the experiment of coke oven desulfurization ash applied to cement concrete was carried out the study. The results show that coke oven desulfurization ash is a kind of light and fine powder with the average particle size of about 36.3 μm and is soluble in water. The main phases include Na_2CO_3, Na_2CO_3 · H_2O, Na_6 (CO_3) (SO_4) _2 and NaCl . The proportion of 0.5% to 2.0% into the cement, the standard consistency of cement water slightly lower, and there is a certain retarding effect. Adding 0.5% ~ 2.0% of the concrete to concrete will slightly increase the compressive strength of concrete for 1 d, but will reduce the compressive strength of concrete for 7 d and 28 d. Compared with Na_2SO_4 early strength agent, the early strength is relatively weak, which can further explore its feasibility as early strength agent for concrete.