The precipitation performance and kinetics of gibbsite from sodium aluminate solution with different sodium oxalate concentrations as well as the corresponding influence mechanism of oxalate during the seed precipitation process were systematically investigated by physicochemical properties test, using SEM and Raman spectra. As the concentration of sodium oxalate increases, both the precipitation rate and particle size of gibbsite decrease. The presence of sodium oxalate not only increases the viscosity of sodium aluminate solution, but also promotes the transformation of Al(OH)₄- to Al₂O(OH)₆². The overall reaction rate constant decreases and the apparent activation energy of gibbsite increases with the increasing sodium oxalate concentration, the rate controlling step of which is chemical reaction. The needle-like sodium oxalate precipitates on the gibbsite crystals and covers the active Al(OH)₃ seed sites, which leads to the lower precipitation rate and the finer particle size of gibbsite during the seed precipitation process.

利用SEM和拉曼光谱，通过理化性质试验，系统地研究了草酸钠浓度不同的铝酸钠溶液对三水铝石的沉淀性能和动力学以及草酸在种子沉淀过程中的影响机理。随着草酸钠浓度的增加，三水铝石的沉淀速率和粒径均降低。草酸钠的存在不仅增加了铝酸钠溶液的粘度，而且还促进了Al（OH）_4-向Al ₂ O（OH）₆ ²的转化。。随着草酸钠浓度的增加，总反应速率常数降低，三水铝石的表观活化能增加，其速率控制步骤是化学反应。针状草酸钠沉淀在菱铁矿晶体上并覆盖活性Al（OH）₃晶种位点，这导致晶种沉淀过程中较低的沉淀速率和较细的硅藻土粒度。