论文部分内容阅读
纯丹宁锗酸的沉淀机理随溶液中锗浓度的不同而不同。在含Ｇｅ＜１０ｇ／Ｌ、ｐＨ７以下丹宁锗酸能与ｚｎ￣（２＋）、Ｃａ￣（２＋）、Ｆｅ￣（２＋）等二、三价正离子反应生成复盐沉淀；在含Ｇｅ＞１０ｇ／Ｌ的丹宁锗酸分子之间发生交联聚合反应，在ｐＨ３以下则带正电荷，吸附ＳＯ￣（２－）＿４、Ｃｌ－，ＮＯ－＿３等负离子而沉淀，随锗浓度进一步增大，交联聚合反应增强，带氢键的官能团增多，能吸附大量水而产生胶凝结块。锗浓度越高胶凝速度越快。上述沉淀反应均与溶液温度、丹宁液浓度及丹宁／锗无关。
The precipitation mechanism of pure tannin germanic acid varies with the germanium concentration in the solution. Tannin germanic acid with Ge <10g / L and pH7 can react with divalent and trivalent cations such as zn¯ (2 +), Ca¯ (2 +) and Fe¯ (2+) 10g / L tannin germanic acid cross-linked polymerization between the molecules, at pH below 3 with a positive charge, adsorption SO ~ (2 -) _4, Cl-, NO-_3 and other negative ions and precipitation, with the germanium concentration further increased Large, cross-linked polymerization reaction is enhanced, with hydrogen-bonding functional groups increased, can absorb large amounts of water to produce gel agglomeration. The higher the germanium concentration, the faster the gelation speed. The above precipitation reaction is independent of solution temperature, tannin concentration and tannin / germanium.