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PAC盐基度详解:如何影响混凝性能及产品选择

什么是PAC盐基度?

盐基度(B值)代表PAC中铝形态的水解程度,是决定混凝效率、pH敏感性和不同应用适用性的最关键质量参数。

盐基度(%)= [OH⁻] / (3 × [Al³⁺]) × 100

简单来说,盐基度表示铝的电荷在制造过程中已被羟基中和的程度。这种预水解使PAC比未水解的混凝剂(如硫酸铝)具有更优异的性能。

盐基度范围 分类 外观
0-20% 极低 清澈至浅黄色液体
20-40% 浅黄色液体
40-60% 黄色至琥珀色液体/白色至黄色粉末
60-75% 深琥珀色液体/黄色粉末
75-85% 极高 深棕色液体/深黄色粉末

盐基度对混凝性能的影响

1. 电荷中和效率

高盐基度PAC含有更多的多核铝形态(如Al₁₃和Al₃₀聚合物),具有高阳离子电荷密度,能够更有效地中和带负电的胶体颗粒。

2. pH稳定性

高盐基度PAC消耗更少的水中碱度,减少或不需投加pH调节剂,在低碱度水源中表现更佳。

3. 絮体形成

高盐基度(60-85%)PAC产生更大、更致密的絮体,沉降更快。

4. 残余铝

高盐基度PAC在出水中残留铝含量更低,这对饮用水处理至关重要(要求残余铝 < 0.2 mg/L)。

如何选择盐基度

应用 推荐盐基度
饮用水(地表水、低浊度) 60-80%
市政污水 50-70%
工业废水 60-80%
印染废水 70-85%
游泳池水 30-50%

HydroChemix每批产品均附有检测报告,按照GB/T 22627-2014标准进行检测。联系获取不同盐基度的PAC样品进行烧杯试验。

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