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在30℃下聚丙烯酰胺(PAM)和部分水解聚丙(HPAM)在(土般)土和高岭土表面的吸附等温线可用 Langmuir 方程描述。按该吸附模式计算,PAM 和 HPAM在(土般)土和高岭土上的特殊吸附自由能(△C_(sp)~0)平均约-23.5KJ/mole 单体单元,吸附过程是高度不可逆的。HPAM 可促进(土般)土颗粒形成微絮凝物,但无明显的沉淀物出现。HPAM 絮凝高岭土,PAM 絮凝(土般)土和高岭土时,有快速絮凝和缓慢絮凝之分。还研究了下列诸因素对(土般)土—高岭土混合悬浮液选择性絮凝的影响:PAM 和 HPAM 的分子量和水解度,浓度和加量;混合悬浮液中总的土量和两种土的比例。选择性絮凝的动力学与 Pugh—Kitchener 的观点相符。
The adsorption isotherms of polyacrylamide (PAM) and partially hydrolyzed polypropylene (HPAM) on (soils) and kaolin surfaces at 30 ° C can be described by the Langmuir equation. According to the adsorption model, the specific adsorption free energy (△ C_ (sp) ~ 0) of PAM and HPAM on soils and kaolins average about -23.5KJ / mole. The adsorption process is highly irreversible. HPAM promoted (soil-like) soil particles to form micro flocs, but no apparent sediment appeared. HPAM flocculation kaolin, PAM flocculation (soil) and kaolin, there is rapid flocculation and slow flocculation of the points. The effects of the following factors on the selective flocculation of (earthy) kaolin mixed suspensions were also studied: the molecular weights and degree of hydrolysis, concentrations and additions of PAM and HPAM; the total amount of soil in the mixed suspension and the amount of soil proportion. The kinetics of selective flocculation is consistent with Pugh-Kitchener’s view.